Text

Rept on Sys Disturbance 770516, Evaluation Rept of Major Outage
	ML20084B732
Person / Time
Site:	Turkey Point
Issue date:	06/29/1977
From:	; FLORIDA POWER & LIGHT CO.
To:	;
Shared Package
ML20084B707	List: L-77-228, Forwards Rept on Sys Disturbance 770516; ML20084B704; ML20084B732; ML20084B752;
References
	NUDOCS 8304070051
	Download: ML20084B732 (38)
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. . d O REPORT ON SYSTEM DISTURBANCE MAY 16, 1977 J

FLORIDA PCWER & LIGHT COMPANY 8304070051 780825 '

PDR ADOCK 0500025J I j S PDR t

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- . O O TABLE OF CONTENTS PAGE Introductic: 2 1 Summary 1 Description of Disturbance 3 -

Loss of Turkey Point Unit 3 3 Loss of Ft. Myers-Ranch 240 kV Line 4 Initial Service Restoration 6 Loss of Andytown-Orange River 500 kV Line 6 Service Restoration 7 System Conditions 7 Discussion 3 Ft. Myers-Ranch 240 kV Line 8 Reclosing Practices 8

- Fault Pressure Relays 9 Gas Turbine Automatic Synchronizing 10 Operating Philosophy -

11 Transmission Planning 13 Recommendations 13 LIST OF EXHIBITS FIGURE Map of Area Affected - Loss of Turkey Point Unit 3 1 and Ft. Myers-Ranch 240 kV Area Loads and Generation - 10:24 a.m. 2 Frequency and Voltage at Ranch Substation- 10:24 am 3 Area Loads and Generation - 10:08 a.m. 4 Net Unit Capabilities - 10 :08 a.m. 5 Sequence of Relay and Breaker Operations 6 Scamary of Events 7

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LIST OF EXHIBITS (Cont'd.)

FIGURE Sum.ary of Plant operation 8 Area Loads and Generation - 12:03 p.m. 9 Map of Area Affected - Loss of Andytown-Crange 10 .

River 500 kV Line .

Operating Record - Certain Transmission Lines 11 E

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V V INTRODUCTION Florida Power & Light Company experiented a major outage on May 16, 1977 that extended from Ft. Pierce southward along the East Coast to the Florida Keys.

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High speed oscillograph records, recording charts and other data have been examined in order to reconstruct the sequence of events that occurred. This report doc'uments the sequence of events, and recommends corrective measures and further system studies.

SUMMARY

At 10:24 a.m. the Ft. Myers-Ranch 240 kV Line, carrying approximately 420 MW, tripped due to a phase-to-ground fault. The east and south areas of the FPL system (See Figure 1) became separated from the north and west areas when three 240 kV and seven_138 kV lines re- ,

layed sequentially due to instability. This split of the trans-mission system resulted in the St. Lucie Plant of the east area being tied only to the north and the Riviera Plant being islanded along with a portion of the east area load.

Frequency in the isolated area dropped rapidly with Turkey Point Units 1 and 2, and Port Everglades Units 1 and 3 generating 1003 MW to supply 2957 MW of load (See Figures 1 and 2). As the frequency declined, underfrequency relay's shed approximately 1544 MW in steps beginning at 59.2 Hz and continuing through 57.1 H:. The load generation imbalance continued and the frequency dropped to a minimum value of 49 H: (See Figure 3). Turkey Point Unit 1 and

. . V(s Port Everglades Units 1 and 3 were tripped by operation of l generator underfrequency protection set at 57.0 H: with a 12 second delay. Turkey Point Unit 2 was tripped by a bearing oil low pressure signal. j t

Approximately four seconds after 10:24 a.m. St. Lucie Uni I was ~;

e tripped nanually following a load rejection due to high frequency.

i Prior to this tL=e the S t. Lucie Operator had reported low system voltage, and excessive reactive and armature current on the unit.

The Riviera units were carrying approximately 532 MW prior to i separation of the system and were isolated into an area with 105 a

MW of load. After six minutes, the operator opened the generator f ,

oil circuit breakers due to operating problems.

The outage then extended from Ft. Pierce to the Florida :jeys and affected approximately 1,300,000 customers. Service was restored to almost all customers by 3:00 p.m.

E The east and south areas had been importing approximately 1140 MW just prior to the system split due to the earlier forced outage ;

of Turkey Point Unit 3 at 10:08 a.m. This generation loss of 634 .

i MW had isolated Peninsular Florida but the combined spinning f

reserve of the Florida Systems had been suf ficient to cover the loss and arrest the frequency decline at 59.59 Hz. At 10:14 a.m. s i

I Peninsular Florida had been tied back to the systems to the north.

See Figures 4 and 5 for details of inter-area flows, tie flows, loads, I

generation and spinning reserve.

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() 1 DESCRI? TION OF DISTURBANCE )

Loss of Turkev Point Unit 3 it 10:08 a.m., May 16, 1977 Turkey Point Unit 3 experienced a reactor and turbine trip as a result of a f alse relay operation.

Chattering contacts in a sensing relay in a reactor coolant pump -

breaker monitor circuit gave false indication of the loss of a reactor coolant pump. Turkey Point Unit 3 was generating 684 MW at the ti=e of the trip. Peninsular Florida became isolated from systems to the north when Florida Power Corporation's Suwanee-Archer 230 kV line, two Ft. White-Inglis 115 kV lines, and Ft.

White-Jasper 69 kV line relayed sequentially due to instability.

The frequency dropped to 59.59 H: where the decline was arrested as a result of governor response.

The system Power Coordinator attempted to order gas turbines started at Ft. Myers Plant. The generators in Peninsular Florida began to pick up the frequency and at 10:14 a.m. the north-south lines were re-established and the frequency returned to 60 E:. It was discovered that the order to start Ft. Myers gas turbines had

, not been received. They were again ordered to be brought on line and loaded. In the meantime Port Everglades Unit 2 which had been synchronized to the system at 9:33 a.m. tripped off line carrying 38 MW due to low drum level. Transmission voltage in the Miami area was approximately 9 5 % of normal.

The St. Lucie operator reported icw system voltage, excessive reactive on the unit and excessive armature current. The unit was operating in excess of its rated capacity of 1000 MVA. Relief was needed or the unit would have to be removed from service. System I

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() voltage had dropped to 230 kV from a normal of 238 kV. Reactive leading was 700 MVARS. Armature current was 27,000 amps on a maximum rating of 26,000. The Dispatcher was again notified but could not relieve the problem. The Operations Supervisor then instructed the Operator to reduce voltage to protect the unit.

System voltage at St. Lucia fell to 219 kV. Reactive loading was reduced to 550 MVARS .

The Southern Division Dispatcher was ordered to switch on all sub-station capacitors. The Northern Division Dispatcher was ordered to raise the voltage in the Brevard area as much as possible.

An attempt was made to start gas turbines at. Lauderdale and Port Everglades frem the Power Coordinator's Control Console. None started at Port Everglades. Three gas turbines were started locally at Lauderdale, but failed to synchronize due to low voltage.

Loss of the Ft. Myers-Ranch 240 kV Line At 10:24 a.m. the Ft. Myers-Ranch 240 kV line relayed due to a phase-to-ground fault. Just prior to this relay action _the line was carrying approximately 420 MW. The loss of the Ft. Myers-Ranch 240 kV line resulted in a further increase in ficw south from Malabar . This power swing resulted in the separation of the east and south areas from the remainder of the system at 10:24 a.m. (See Figure 1) The sequence of relay and breaker operations is given in Figure 6.

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. . \_; -o-The St. Lucie Unit i load spiked frem 790 MW to 950 MW just prior i to the transmission line separation south of the St. Lucie Plant.

The frequency then went high when the transmission lines opened to the south. Governor action decreased the load rapidly. Approxi- '

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mately four seconds later, St. Lucie Unit i reactor was tripped manually following load rejection to about 100 MW. The Riviera units were carrying approximately 532 MN prior to the separation of the system. Riviera Units 3 and 4 became " islanded" with 105 MW of load. The boiler fires were lost due to a master fuel trip on the load rejection. The frequency was above 62 H: and was being

lowered by the operator. After about 6 minutes the operator opened the generator oil circuit breakers manually due to frequency in-stability when the units went above 62 H: a second time. The units carried their own auxiliaries. .

The frequency in the remaining aff ected area decreased rapidly due .

3 to Turkey Point Units 1 and 2 and Port Everglades Units 1 and 3 with 1003 MW of generation being lef t to serve approximately 2957 MN of load (See Figures 2 and 3). As the frequency dropped, under- l l

frequency relays shed approxi=ately 1544 MN in stages between 59.2 H: and 57.1 Hz. Load shedding was completed at approximately 2-1/2 f

seconds at which time frequency was 56.3 H . The load and generation imbalance continued and the frequency dropped to a low of 49 Hz in approximately 5 seconds. Port Everglades Units 1 and 3 and Turkey Point Unit 1 were tripped by operation of generator underfrequency i

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protection set at 57.0 H: with a 12 second delay. Frequency was 53.3 H:. Turkey Point Unit 2 was tripped with low bearing oil pressure signal as the turbine speed decreased. Underfrequency relays operated, but one 240 kV oil circuit breaker failed to trip when the lock-out relay contacts failed to make up. See Figure 7 .:

and 8 for a su==ary of events and summary of plant performance during the disturbance.

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In the remainder of the system, north and west of the split, frequency j j

increased to above normal but recovered to 60 H: as the Florida Power ties to the north were re-established. The remaining system load was 1553 MW and generation was 1798 MW. Net export was 240 MW until scheduled interchange was re-established.

INITIAL SERVIC5 RESTORATION - -

The Power Coordinators proceeded to identify the affected area and reconnect the system. Restoration proceeded f cm the north by energizing the 240 kV transmission lines to the south. At 12:03 p.m. the total system load was 3408 MW with 3318 MW of generation and 90 MW of i= port frem neighboring utilities.

Loss o f the Andvtown-Orance River 500 kV Line At 12:03 p.m. the fault pressure relay on the "A" phase 500-240 kV autotransformer at Andytown operated incorrectly when the auxiliary cooling pumps were started. Approximately 652 MW were being carried on the 500 kV circuit when the trip was initiated. See Figure 9 for load, generation, and inter-area flow data. This initiated a power swing which resulted in the separation of the east and south areas

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at Ft. Myers and Malabar. See Figure 10 for the area affected.

Generatien in the affected area, consisting of gas turbines and Riviera Units 3 and 4, was lost.

SERVICE RESTORATION .

The affected area was quickly identified and i= mediate restoration proceeded from the north. Gas turbines quickly picked up isolated areas and were resynchroni:ed with the system. Start-up pcwer was provided to the steam units rapidly from the restored 240 kV system.

Service was restored to all but a few isolated areas by 3:00 p.m.

There was no significant damage to generating equipment. All units ,

were returned to service during the day.

SYSTEM CONDITIONS ,

Prici to the disturbance, the system load was 4660 MW with generation of 4710 MW. The system spinning reserve was 400 MW with an additional 1022 MW of available steam reserve and 1571 MW of fast start com-bustion turbines and diesels. All line flows were well within limits.

Area load and generation data is given in Figure 4 for the loss of ,

' Turkey Point Unit 3 disturbance, Figure 2 for the loss of the it. .

Myers-Ranch 240 kV Line, and Figure 9 for the loss of the Andytown-Orange River 500 kV Line. Figure 5 gives the unit loading and reserves a: 10:08 a.m. prior to any disturbances. ,

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DISCUSSION ,f A detailed review and analysis of the events prior to the dis , .

turbance and the subsequent restoration of service has been conducted. A nu=ber of specific items which individually woQld be of lesser consequence, together contributed to the disturbance -

cr hindered restoration.

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Ft. Mvers-Ranch 240 kV Line The Ft. Myers-Ranch 240 kV line along with the Ft. Myers-Ranch / /

138 kV line and the Andytown-Orange River 500 kV line are the -

three transmission ties between the east and south areas and the west coast. The disturbance was triggered by a temporary phase- _

to-ground fault on 3 phase while the line was loaded to approxi-mately thermal rating. .

Examination of the operating records of certain critical trans- .

mission lines (See Figure 11) indicates this line has had 23 actions since January 1, 1976. Of these relay actions, 20 were of unknown origin. A concerted effort is being made to determine the reason for the poor operating record of this line and to develop recommendacions for L=provement.

Reclosinc Practices Studies of high speed reclosing practices following prior distur-bances have shown the danger of high speed reclosing following stability swings. FpL has added relay equipment to sense out-of-step conditions in ordar to block reclosing following trip due to power swings.

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Although tripping of the Ft. Myers-Ranch 240 kV line was initiated

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, . hy a phase-to-ground fault, the blocking relay at Ft. Myers was

'made up due to the heavy line loading inhibiting high speed re-i closing. The Ranch terminal reclosed. Af ter about three seconds, i the Ranch terminal again tripped due to a 3 phase-to-ground f ault, ,

and locked out. It is unknown whether successful high speed reclosing would have prevented system separation, but a review cf reclosing practices under present system conditions has been initiated.

Fault Pressure Relays

,e Fault pressure relays are mechanical devices used on transfor=ers

, to detect internal faults by the sudden pressures generated by these faults. These relays when set to trip, provide positive backup protection for,the. transformer on which they are installed.

Difficulties with calibration, and false operation from vibration and/or external faults have. occurred. While modifications and revised test procedures have reduced the problem, since 1971 fault pressure relays on autocransformers on TpL system have been wired to alarm only.

When the autotransformers at Andytown and Orange River were installed this practice was reviewed. The 560 MVA single phase 500-240 kV units had experienced two failures in test. Delivery schedules had been extended such that the spare units would not be available until after the line was converted. The line, at 500 kV, was needed for O e 0

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i j system-reliability. Because of these factors, it was decided 4

to initially wire these relays to trip in order to limit trans-

former damage that might occur frem an internal fault.

i At 12:03 p.m. the ~f ault pressure relay on " A" phase 500-240-kV ,

autotransformer operated incorrectly when the auxiliary cooling pumps were started. Over 6.50 MW was being carried over the line j and;the system was shut down for a second time approximately one and one-half hours into the initial restoration.

I Subsequent tests have shown the relay on "A" phase to be over-

sensitive to pressure. Tripping by all fault pressure relays at j both Orange River and Andytown has been disabled. With the installation of spare units at both locations it is planned to,

wire the'se relays for. alarm only, consistent with current practices.

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Gas Turbine Automatic Synchronizing J

j There are 24 gas turbines installed at the Lauderdale Plant.

i Twenty were available for service and on Lemote supervisory control.

Four gas turbines were out for routine maintenance.

i At 10:13 a.m. the Dispatcher requested that three gas turbines be l placed'in service. The gas turbines started, came up to speed i

and at 10:20 a.m. were rsady to synchronize to the system. However,-

the nachine/line voltage matching feature of the auto-synchronization system did not allow breakers to close because machine voltage could not be lowered enough to match the extreme low voltage on i

the system.

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The voltage regulator bandwidth on the gas turbines at Lauderdale Plant is presently designed such that automatic synchronizing can be accomplished only when the system voltage is between 15.2 kV and 12.9 kV. During the period following the trip of Turkey Point Unit 3 and prior to tripping the Ft. Myers-Ranch 240 kV, ;

attempts were =ade by the Power Coordinators to start the Lauder-dale and Port Everglades gas turbines. At that time voltage on the Lauderdale gas turbine bus was 11.5 kV or 11% below the lower limit for autcmatic mode. Before the Operator could synchronize the units manually, the fault had occurred and the system separated.

These settings have since been verified as well as tests conducted 4

with the bandwidth " adjusted" both higher and lower. The manu- ,

facturer has been contacted r'garding e the limits essential for protection of'the unit. Power Coordinators were not previously aware of this limitation. In addition, no metering is available in Ehe System Dispatch Office for reading voltage on the Lauderdale bus. Engineering has begun to telemeter the Lauderdale 240 kV bus voltage to the Systa= Dispatch Office. Transformer tap settings at Lauderdale and Port Everglades have been changed to provide better coordination at lower system voltages.

Cperating Philosophy The Operating Committee of the Florida Electric Power Coordinating Group ccordinates the operation of all systems within Peninsular Florida and establishes operational guides, practices and procedures ,

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on spinning reserve, load shedding and emergency operating pro-cedures. The Florida systems are designed and operated to allow loss of the largest unit in the state without loss of load. The required spinning reserve to accomplish this is allocated among

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systems on the basis of unit si=e and system peak load. Distri-bution of the spinning reserve allocation within an individual system is a function of area protection, unit availability and economics.

The FPL system had responded in a " normal" manner following the trip of Turkey Point Unit 3 at 10:08 a.m. By 10:14 a.m. ties between Florida and the Southern Company had been re-established and the frequency returned to 60 H:. There were heavy imports of power into Sou'th ?lorida. I.t would appear that the system was stable. Stability studies are under way to verify this. At 10:24 a.m. this major power outage occurred as a result of a second contingency outage, loss of a major operating transmission line in addition to the less of a major generating unit.

Providing sufficient spinning reserve in any area to cover a second contingency outage is a matter of balancing cost and risk.

These factors must be dealt with by Power Coordinators daily.

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Installation of the System Control Center in late 1973 will provide l the ability for security analysis to improve reliability. However, until then it must be dealt with on a subjective basis.

l Studies to quantify cost versus probability of risk are being i

! conducted and operating guidelines developed.

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Transmission Planning A longer range alternative to additional spinning reserve for double contingency protection is the strengthening of transmission >

! ties into the east and south load areas. An example of this is i

the Andytown-Ft. Myers 500 kV line. Conversion of this line from 240 kV to 500 kV was advanced from 1979 to 1977 to increase reliability. Acceleration of present transmission plans should be evaluated and weighed against the cost of increased spinning reserve to reach a determined level of reliability.

RECOMMENDATIONS

1. T&D Operations / General Engineering - Conduct investigation and make recommendations to improve operating performance q

of the Ft. Myers-Ranch 240 kV Line. .

2. System Planning / System Protection / General Engineering -

Conduct review of current practices and designs relating to high speed reclosing of transmission lines.

3. General Engineering - Review current application of fault i pressure relays on autotransformers and generator step-up transformers. Investigate to determine all installations j are in conformance.

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4. Pcwer Resources - Determine optimum settings for gas turbine voltage regulators considering both generator protection and i

system reliability. Coordinate settings with System Operations.

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5. General Encineerinc - Procure material and engineer jobs to telemeter Lauderdale 240 kV bus voltage to the System Dispatch Office.

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6. System Ocerations/ System Plannine - Conduct studies to quantify cost versus benefit of providing spinning reserve

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for second contingencies. Establish operating procedures accordingly.

7. System Planninc - Evaluate acceleration of transmission expansion as an alternative to increased spinning reserve.

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EVENT LOSS of Ft, Myers - Ranch 2dOkV line TIME 10:2d a.rn.

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l Net Interchange l 3efere After NORTH

't 3ETCRE AFTER 527 in 240 out LOAD 722 705 f

l 367 3 m 30 6 GEN. 399 1

30 A -.-p j Cutside Ties I

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LOAD 792* 296

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GI:; . 1286 105 I GEN. . 1175 . ,

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.I OA 1633 S WW h SCUTH I 3ETCE AFTER Cut LCAD 2636 0

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LOAD 4890 1663 A=After 3=Before GEN. 4363 1903 '

'321 MW isolated with South area after system split.

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I O' O Figurc 4 1

Loss of Turkey Point #3 ::ME 10:08 a.m.

EVEN NORTH Net Interchange AFTER 3EFORE 3efore After 4-- 15 3 LCAD 690 6a0 50 out 501 in ap 341 A GEN. 757 914 Cutside Ties 35i 3 475 A 62 3 160 4 A 4

G57 EAST AFTER 3EFCRI AFTER 3EFORE l 7C5 710 LCAD 715 755 LCAD 1030 1112 GE:3. 1255 1308

'GE:: . . ..

562 A -f 1590 A 892 3 WW sCU"'M

' 3EFCFE AITER Ceen LOAc 2560 2590 1000 GEN. 1668 1

SYSTD1 3EFCRE AF'"ZR LOAD 4660 4735 4710 4234 A=After GE:1.

3=Before t

i

---~- -- - - - , - . . , - _ _ _ _ _ , , _ _ _ , _ _ _,

O 4

O mms FLCRIOA PCWER & LIGHT COMPANY NET CNIT CAPABII,ITY-MW 'AT 10:08 AM MAY 16, 1977 PLANT CONTINUCUS AC7JAL UNIT RATE EXP. LOAD 3R NORMAL LIMITATICN .

TP41 369 369 328 41 TP92 369 195 188 0 5 PM 5eal leak "A" 3FP.

TP93 681 681 684 0 TP44 681 0 0 - 7-17-77 Refuel.

FLd4 138 0 0 -

RFC 12:30P FL*5 138 0 0 -

RFC 3:00P PE91 205 90 90 0 Cendenser leak.

PE92 205 0 38 0 RFC 11:00A Not released.

PE93 368 368 340 28 PE94 368 0 0 -

5-28-77 overhaul.

3522 1693 1668 69 RV43 273 273 501 45 Rv44 273 273 SL#1 309 751 754 -

Unkncwn Heater drain pump cut.

1355 1297 1255 45 CC#1 369 369 333 36 C082 364 173 166 7 5-18-77 23 FD fan notor repair.

SN#3 138 0 0 -

RFC 2:00P SN#4 370 370 258 61 SN#5 370 0 0 -

RFC 1:00P 1611 912 757 10 4 FM41 138 138 106 23 FM*2 369 369 339 30 MT11 772 772 585 129 1279 1279 1030 182 STEAM 7767 5191 4710 400 OSL 27 24 0 0 PE 42 will not start.

GTPE 338 310 0 0 5-16-77 412 maint.

GTFL 676 676 0 0 #19 base only.

GTFM 612 561 0 0 5-20-M7 47 gen. gr und.

1653 1571 0 0 TCTAL 9420 6752 4710 400 Scheduled interchange = 0 Required Spinning Reserve = 337 Expected Men. a.m. peak = 5000 Sun p.m. peak was 4442 MW.

~4eather: Mostly sunny today and *uesday. Hi in lo 80's. Lo in lo 70's. .

Wind East 10 MPH. l l

SYsitti ol51UR;ANCf HAY ll, l')ll SL40 tnt'C Of kLlAY AND CIRCUIT bHfAKER OPihAll0NS h[tAY t VtNI HINAHK5

{Vf HI TARGfiS ym 11ME 1[AJ10H Clk(Uli Uni t No. } T r i pp.:d betective type bl0 euxilles y relay ist Huector 1 10:08Att furlicy Pulnt Coulant Pun.p mastos ciscuit becaker cubicle caused reactor trip.

10:09 ; $0Att Pus t Everglades Unit Nu. 2 ,Irlpped H.uiuolly. Unit lied been syncieronleed to tlic 2

system et 9:33AH. Buller tripped due tu tow datan Icwul.

I t. Hycts-Rench 28eokV Opened Pfl, Gi Droward, Hldway aml Ringling use.Illugraphs lo:28 SAM fL. Hyers 3 secorded pliase to giuund fault mL tiels t ime.

Ranch i t. tiycrs-Rancti 28.ukV dpened CP hingling oscillugram ludicated D-Please to usuund fault. f t. Hycts tesminal did nut reclus Lecause out-of-step recluse blocking sclay was pickcJ up on lued prior tu fault.

ft. Hyers-Manch 138kV opened A,0,0,PP lima assimieJ. It. Hyers terminal did out le e5 Cycles ft. Hyers secluss 14ccouse of special c.lscuit tu milow s eclusing tieruuuh clicck syncin onizing s elay unty, and only wl. n linu is ener9 ecJ.

5 Area cast of ft. Hyers was out of synchronism befus e clieck syncteronism relay could opes ate.

It. Hyers-Mancti 28eukV Reclused Time assumcJ.

5 e20 Cycles Manch Halal,ar-Hidway 2feOLV No. 1 Opened 0,PP out-of-step relay operated tu prevent 6 +5) Cyclus Malobar recluslug.

iti skuy Itidway-Rancle 28.ukV OpencJ A,8,PP,21 Out-of-step relay operated tu prevent 1 e$$ Cycles reclusing.

Hiskuy-Pluw sus l}8kV Opened A,b,C,PP,25 Miclosed at e80 cycles on1 tripped 49also at 8 5$.', Cyc les Plimousus

89 cycles. Idructs es e fus two trips.

Pratt & Wlaltney-Rancti 2feokV Upened 8,C,l! Out-of-step s eley operatcing.

19 + 13) Cycles Rences he .cli-We s t Palm beact. 1)UkV RecluscJ 20 + 448) Cycles he Kl. n e.cle-We s t Pelas Beects l}8kV Opened Sac ( wsnt No. 10 West Palm Beetle Mencl.-West Pelm Beacle 138kV Open J A,8,C,PP,ll 21 e19$ Cycles Men 6ta fL. Hycts-Aoncti 240LV OpencJ CP Broweid uscillegreple recurJud ps4>c tu ground fault.

22 +2 tid C ycles St. Lucic Uni t tom. 1 Tripped Manu lly

2) Unknames Port (vergl.Jun unit No. 1 Tripped Uf 24 r unb.uwei Port fwergl Jes Uni t No. } TripecJ Uf 25 conb aan TurLcy Point Unit Nu. I IrippcJ Uf 26 c unkemmen Iuskey Point Unit No. 2 Tripped tuw bearing UnJcritcquency relays operetcJ least 4,nc 240kV Oil Pressure circui t lereaker f elled to t r ip lacceuse lock-out relay cue.tect failed to make up.
I t n.sc t t imiu al.ese uni t s trippsJ la smet be*sn, 4,u t it con t,e assue.cd tient aanJc t f i cques.c y trips occurrcJ etuut 12 sc6uuJ> af ter E vent No. 9. Turkey Point Unit No. 2 tripped susette.e later. j ',9
.n .a
~.li O On 0%
u, O _ _ _ _ _ _ _ _ _ _
BltAt E Vf NT
.Hom flNt hjgoH Clsu.LJll ML TANGEIS HlHARKS Unkspam hiviera Unit No. 3 Tripped Hanually 27 28 ju:)oAM Ranch M.ancla-Mlviera 1)BkV Nu. 1 CluscJ Hanually eleS Cycles Nanch R nch-hlviera 138kV Ho. 1 OpencJ $cm Cvent No. 17 79 e8.8 Cycles Riviera Hasicli-Riviera 1)BkV Ho. 1 OpencJ b,C,PP 30 Manoli-Riviera 1)BkV No. I Recluged 38 e6) Cycles Hlvicta Unit No. 8e Tripped Hanually 32 e21 $cconds Histura
$00/28,0kV Autu Trans bank Tripped IFR A-Ptiase over sensitive fault pressuse relay oper.ted 12:03tM Andytown then cooling ull puenps were star tcJ. This opened the Andytuwn-Orangu River $O0kV lisie. Ft. Hycrs ft. Hycts-haswh 240kV OpencJ PP Out-of-step relay blocked seclusing. 38e e)) Cycles ft. Nyers ft. Myers-Ranch 1)BLV OpeneJ A,B,0,PP Reclusa tho uuif check synchronizing. Noenh Ft. Nyers-Rancti 138kV opesicJ A,0,C , PP e$) Cycles k nch f L. Hyers-Rasah 1)BkV ReclumeJ
)$
36 +77 Cycles Malabar Halober-Hi&ay 28.0kV Ho.1 Opened A,8,Il Malat,ar Halobar-Hidway 240kV Ho. 2 OpencJ 8, C , PP, l! Hedway Halal,ar-Hid sy 2fe0kV Ho. 1 Opened A,B,PP,21 Hidway Halabar-Hidway 2feukV Ho. 2 Opened A,B,21 e62 Cycles Hartman llar tmaan-Hidw.sy 69kV Opened 37 Hal.bar-HIJway 240kV No. 1 RecluscJ Reason tur failure ut uut-of-step relay to 38 ,94 Cycles Hid. y bluck reclusing b.es not been Jutusmined. Hal b.st-Midway 23:0LV Ho. 2 Reclused Huason for failure of out-of-step relay tu 39 e96) Cycles Hidway talock reclusing fi.as not kucn JesusmincJ. 40 e93 Cycles llartman H s tmass-Hidway 69kV kuclused
'u **3 (Aact t ipic 11:1s u,il t ts"lpped is saut Asiuwn, eg tast it was utf prior to _wunt No. 26. .
O u. es o, i
1 1 o
. O Figuro 7 Page 1 of 5 SU DIARY OF EVENTS OF THE INTERRUPTION AND RESTORATION ;
OF SERVICE MAY 16, 1977 10:08 Turkey Point Unit 3 reactor trip. - 4 10:10 Port Everglades Unit 2 tripped. 10:14 Frequency restored to 60E:. 10:24 Ft. Myers-Ranch 240kV line tripped. 10:24 System separation. 10:24:04 St. Lucie Unit 1 tripped. 10:27 LaBelle picked up from Ft. Myers. 10:27:34 Midway-Plumosus picked up frem Midway. 10:30 Riviera Units 3 and 4 removed from service. 10:36 Port Everglades GT i s on line from black start.
~
10:39 Breakers closed at Midway to energize most of the transmission south of Ranch to Andytown - Lauderdale - Port Everglades. 10:45 Port Everglades GT's tripped from overload. 10:49 Port Everglades GT's started. 10:49 Ft. Myers - Ranch 240kV tied thru. 10:50 Ft. Myers - Ranch 138kV tied thru. 10:50 Lauderdale 138kV GT's on line from black start. 10:56 The Ranch - Riviera 41 138kV line energized. to pick up the Ranch - Riviera load area. 10:57 Orange River - Andytown 500kV energized and tied thru. 11:00 Lauderdale 240kV GT's on line. i
. . . _ . . _ - - - _ _ - _ _ . - , __ , .... . . . _ . ~ . . _ . . . , _ ,
C)' ss Figure 7 Page 2 of 5 11:03 Port Everglades GT's tripped from switching on system. 11:07 Riviera Unit 4 on line. 11:07 Port Everglades GT's back on line. 11:10 Riviera Unit 3 en line. c l' 12 r auderdale - Dade 42 240kV line energized. 11:17 Dade - Turkey Point 42 240kV line energized. Lauderdale end of Lauderdale - Dade 42 - 240kV tripped. 11:18 Lauderdale GT's tripped - switching on system. 11:22 The Plumosus - Riviera 138kV lines energi:ed. 11:26 Lauderdale - Dade 42 240kV line and Dade - Turkey Point 42 240kV line energized from Lauderdale. 11:27 Lauderdale GT's back on line, 11:31 Turkey Point - Flagami 41 240kV line energized frem Turkey Point. 11:33 Flagami - Miami 42 240kV cable energized from Flagami. 11:38 The Ranch - 3 reward 138kV line energi:ed. 11:39 Greynolds - Lauderdale il 138kV line energi:ed from Lauderdale to pick up entire Greynolds area transmission, 11:41 Greynolds end of Greynolds - Lauderdale 41 138kV line opened. 11:43 The Miami - Railway - Little River 138kV lines energized. 11:46 The Lauderdale - Little River 138kV line energized.
- . () () Figuro 7 ,
Paga 3 c: o i a< 11:47 The Davis - Cutler - South Miami 138kV lines i energized. 11:47 The Dade - Little River 41 138kV line energized. I 11:48 The Lauderdale - Gratigny - Dade 138kV lines energized. ~ I 11:51 The Lauderdale - Greynolds 42 138kV line energized T 5 to pick up the Greynolds area. 11:51 The Dade - Little River 43 138kV line energized. 12:03 The Dade - Little River 42 138kV line energized. j All transmission lines and distribution substations 2 energized. Distribution feeders were being ener-f gized as rapidly as increasing generation and line loadings would permit.
! System load was 3408 MW. .
i 12:03 Andytown 500-240kV autotransformers tripped. 12:03 second system separation. , 12:06 The Port Everglades buses stripped. 12:10 The Riviera Plant 138kV bus stripped. 1 12:11 The Midway 138kV bus stripped. i 12:11 The Port Everglades GT's on line. 1' 12:11 The Miami 138kV bus stripped. 12:13 Port Everglades - Hollywood 138kV line energized. 12:16 Port Everglades - Port 138kV energi:ed. j 12:16 The Ranch 138kV bus stripped. t 12:16 Lauderdale GT's restarted. i 12:19 The Ft. Myers - Ranch .'40 energized, picking up 4 transmission from Malabar to Lauderdale. The Malabar - Midway also closed.
r~ O u) Figuro 7 Page 4 of 5 12:55 Plumosus bus stripped. 12:57 Riviera - Plumosus $1 138kV energi:ed. 13:00 Riviera - Plumosus 32 138kV energized. 13:08 Miami Beach 69kV transmission energized. 13:08 Ranch - Yamato - Broward 138kV transmission . energized. 13:12 Orange River - Andytown 500kV tied thru. 13:12 Miami - Markee - Little River 138kV energized. 13:13 Dade - Little River 42 138kV energi:ed. 13:13 Dade - Airport 138kV energized. 13:16 Little River - Lemon City 138kV energi:ed. 13:16 Flagami - Coconut Grove 138kV energized. 13:17 Midway - Plu=osus 138kV energized. 13:22 Ranch - Ft. 3yers 138kV energizdd. 13:22 'Dade - Little River 43 138kV energi:ed. 13:23 Ranch - Broward 138kV energized. 13:24 Lauderdale - Little River 138kV energized. 13:28 3roward - Lauderdale $2 138kV energized. 13:29 Lauderdale - Greynolds - Arch Creek - Normandy 138kV lines energi:ed. 13:29 Broward - Lauderdale #1 138kV energized. 13:30 Hollywood energized. 13:30 Midway - Hartman - West 69kV energized. 13:32 Lauderdale - Hollywood 138kV energized. 13:34 Miami - Miramar 69kV energized. 13:35 Broward - Oakland Park - Ft. Lauderdale 138kV energized. 13:37 Lauderdale Unit 4 on line.
( Figuro 7 Paga 5 of 5 l 14:00 , Lauderdale - Golden Glades 138kV energized. i 14:01 Davis - Goulds 138kV energized. l l 14:01 Lauderdale - Gratigny $1 138kV energized. 14:02 Davis - Cutler - South Miami 138kV energized. 14:02 Davis - Florida City 42 138kV energized. - 14:04 Riviera Unit 3 on line. 14:05 Gratigny - Golden Glades 138kV energized. 14:10 Florida City - Princeton energized. 14:13 Turkey Point Unit 1 on line. 14:21 Lauderdale Unit 5 on line. 14:21 Port Everglades Unit 2 on line. 14:37 Port Everglades Unit 3 on line. 14:45 Riviera Unit 4 on line. 15:28 Turk.ey Point Unit 2 on line. . 17:55 Port Everglades Unit 1 on line. 21:18 Turkey Point Unit 3 on line. 21:58 St. Lucie Unit 1 on line.
1937 SUMMAltY OF Pl. ANT PEHFORMAIJCE - SYST1:H DISTUHHAf4CE HAY _16, Huturned 10:24Att 12r02PH 12:03PH Tushine Dollar To System 10:07AH 10:00A13 Outogo Inad Huforo Load Afterft. . load After load Dufore Ioad A'fter Andytown Generator Tripped Tripped for ing inad- Timo PTP unit 3 Hyurs/ Andytown Tripped Dy Df Dy PTP Unit 3 Hanch Trip Trip Trip Trip Trip tal Hti tnt ini pnl (GitOSS) Manually H.fl. 2s13PH 3 hrs-49 min. 0 0 U-r 375 500+ Action Protec-PTP 1 340 Licn Huaring H. lf . 3:20PH $ hrs-4 min. 0 0 Imckout 220 454 Hulay 011 Protec-PTP 2 200 L.P.T. Lion Huactor ralise 9:10PH 11 hrs-10 min. 0 0 Anti-0 0 motoring Trip Hulay PTP 3 720 Action trip -
-d Off For Hefueling Hanually H.P.T. 5 55PH 7 hrs-3L min.
PTP 4 0 0 U-F 112 210 Action PPE 1 100 4 hre-11 emin. l 0 Hanually Hanually Low Draim 2sklPH 54 0 0 Luvul PPc 2 40 Hanually ruel Trip 2:37PH 4 hrs-13 min. 0 0 U-r e 383 5006 Action - PPE 3 360 - Off On Overhaul
- - 12s23PH* 20 min.
PPE 4 218 Over-f 0 0 210 curront I'PC-GT 0 -
- - - 1s37PH 0 0 0 0 2:21PH PFL 4 0 - - -
0 0 0 0 PFL 5 0 Over-0 270 *325 - 12 :27 PH 24 min. 0 0 current - PFL GT 10:30 11:10AH6 2 hre-41 min. 270 los30 10:30 200 203 110 Hanually carried Hanually 2:04PH PHV 3 266 22:03-12:03- auxs.
l Lockout 12:03- Imsa of Thrust rons Dry 11:07AH s. 3 hrn-19 min.
270 los30 10:30 10:30 256 268 288 114 Manually Carried Hanually 2:45PM PHV 4 12:03-12:03- auxa. Lockout 12:03- Losa of Throat Paus Urg l Henctor Manually 9:58PH 11 hce-34 min. en 0 Anti- P-847 0 Trip 4 PSL 1 190 868 motoring Trip C j is . u) i
Figura 9 1 j EvEn: Loss of Andytown - Orance River 500kV ::ME 12:03 c.m. i
. Met Interchange i 3efere After NCRTH 3 ORE WR 90 in 516 cut 721 LOAD 740 30 3 9 J
GEN. 1004 727 6A ** i f a 1 OA 294 3 . 510 A 60 3 h
1 4 t
.cs: IAsr , 3EFOp2 AFTER 3EICFI AIIIA I
j 760 662 LOAD SCO O LOAD
l 299 3 i cgn, 1651 1172 + OI::. 212 0 i
.I j 0A i ,f 't I
53
$ WW p SOUTH , 3EFORE AITER 4 h L AD 1108 0 0A /- GEN. 451 0 i b i i SYSTEM 3EICRI AITIE i LOAD 3408 1383 A=After GEN. 3313 1999 3=Before 4 ) I
. - . _- - . , --.- e, .- - - . - .m,-- . , , . - - - , , , - - . . . . . . - , - , ,_ . - - - -
.. u. = . 4 ; w..:aA . .- .. .. . a ~.,"
u.= _ , - - - % ,. f . .:.:: - . / , , , , , ,, Figure 10
, ,y ..,i ~ . . . , _ , s . '." .', Q pA - -,m '.Am s f". ,k _dT T. ou. ,a === w g...=; .,. *"*,\' i
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w.'~:. ., v, MAY 16* 1977 -
.w.~ # ~-~ s r4 u .a. ' - % A' @ 12:03 PM . " - N C*o*"*"*""'" i L0SS OF- em,==,vu g n, . . .
ANDYTOWN.ORANCE RIVER g.) g-
if 4...+p.
wa "\ ScoKV LINE ':p l +. 3'.L' J:ll:nR i y ,,," f, , o ""j '
,,,,"*'" 4 E' "";"L. *#*u ff E. .
AFFECTED
'" '" =4- *t=" 1T @ '.'- 'E l
l I AREA
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.s STATE OF Ft.OR10A K 'n,,,,, S;,g .D.. ., # ""a'** ELECTRtc mum ,
SYSTEM M AP f'l 4 F
. LORiDA , . POWER S.UCHT . . CQ p/ .9* / . ~ . .
el .e i .. s , . coco. 33rc3 l
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s-Figure 11 Paga 1 of 4 FLORIDA POWER & LIGHT COMPANY OPERATING RECORO OF CERTAIN TRANSMISSICN LINES JANUARY 1.1976 THRU MAY 15. 1977 Ft. Mvers - Lauderdale 240kV Line 5/12/76 Ligntning caused A-Phase to gecund fault. Ft. Myers terminal reclosed successfully high-speed. Lauderdale terminal was closed manually one minute later. Ft. Mvers - Ranch 2L0kV Line 2/9/76 C-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed. 5/25/76 C-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed. 6/17/76 S-Phase to* ground fault, cause unkncwn. Soth terminals reclosed , successfully high-speed. . 6/24/76 A-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed. 8/8/76 A-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed. 10/7/76 Succard caused A-Phase to ground f aul t. Both terminal s reclosed successfully high-speed. 11/6/76 A-Phase to grouna fault, cause unknown. Socn terminals reclosea successfully high-speed, 11/11/76 (8:00PM) A-Phase to ground f aul t, cause unknown. Both terminals reclosed successfully high-speed, 11/11/76 (8:37PM) A-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed. 11/16/76 A-Phase to ground fault, cause unknown. Soth terminals reclosed successfully high-sceed. 11/*_9/76 A-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed.
p' v O V Figure 11 Page 2 of 4

FLORIDA PCVER & LIGHT CCMPANy OPERATING RECORD OF CERTAIN TRANSMIS510N LINES JANUARY 1.1976 THRU MAY ic lo77 Ft. Mvers - Ranch 2kOkV Line (Cont'd) 11/20/76 C-Phase to ground f aul t, cause unknown. Both terminals closed manually one-half minute later.
12/7/76 A-Phase to ground fault, cause unknown. Both terminals reciosed successfully high-speed. 12/14/76 3-Phase to ground f aul t, cause unknown. Ft. Myers terminal reclosec successfully high-soeed. Ranch terminal closed manually one-quarter minute later. 12/19/76 C-Phase to ground f aul t, cause unknown. Both terminals reclosed successfully high-speed. C-Phase to ground f aul t, cause unknown. Ft. Myers terminal 12/20/76 reclosed successfully high-speed. Ranch tenninal closed manually three-quarters minute later. 12/25/76 (2:12PM) B-Phase to C-Phase f aul t, cause unknown. Both terminals closed manually one-half minute later. 12/25/76 (2:13 PM) C-Phase to ground f aul t, cause unknown. Both terminals reclosed successfully high-speed. 1/2/77 A-Phase to C-Phase f aul t, cause unknown. Both terminals reclosed high-speed. 1/28/77 Cane burning under the line caused a C-Phase to ground f ault. Ft. Myers terminal reclosed successfully high-speed and Ranch terminal was closed manually one-half second later. 1/29/77 Cane burning under the line caused C-Phase to ground f ault. Ft. Myers terminal closed manually one-half minute later and Ranch terminal closed manually three-quarters minute later. 2/8/77 C-Phase to ground fault, cause unknown. Ft. Myers terminal reclosed successfully high-speed. Ranch terminal closed manually one-quarter minute later. 3/18/77 C-Phase to ground faul t, cause unknown. Both terminals reclosed successfully high-speed. Ft. Mvers - Ranch 138kV Line 4/8/76 A-Phase to ground fault, cause unknown. Both terninal s reciesed successfully.
pv p Figuro 11 V Paga 3 of 4
. . FLORIDA POWER & LIGHT CCMPANY OPERATING RECORD OF CERTAIN TRANSMISSION LINES JANUARY 1.1976 THRU MAY 15. 1977 ~t. Mvers - Ranch 13SkV Line (Cont'd) 11/3/76 3-Phase to ground f aul t, cause unknown. Both terminals reclosed successfully high-speed.
12/22/76 Cane burning under the line caused three-phase f aul t. Ft. Myers and Ranch terminals closed manually one minute and three quarter minutes later respectively. . 1/11/77 C-Phase to ground f aul t, cause unknown. Both terminals closed manually one-half minute later. 1/27/77 3-Phase to C-Phase fault, cause unknown. Ft. Myers and Ranch terminals closed manually one-half minute and one-quarter minute later respectively. 1/28/77 C-Phase to ground f aul t, cause unknown. Both terminals reclosed successfully. 2/28/77 C-Phase to ground f aul t caused by f ailure of potential device at Ranch terminal. Both terminals closed manually one-half minute later. I ndi antown - Mi dwav 2h0kV Li ne No operations indiantown - Pratt & Whitnev 2L0kV Line No operations M i dway - Pratt t Whitnev 2h0kV Line 9/29/77 C-Phase to ground fault, cause unknown. Both terminals reclosed successfully high-speed. 11/14/77 C-Phase to ground f aul t, cause unknown. Pratt & Whi tney terminal reclosed successfully high-speed. Midway terminal closed manually - thi rty-four. minu tes l ater. Pratt G Whitnev - Ranch No. 1 240kV Line 2/17/76 S-Phase to ground f aul t, cause unknown. Both terminals reclosed successfully high-speed.
e ,-
Figure 1 -
( Page 4 c: 4 4
- - FLORIDA POWER & LIGHT COMPANY .
OPERATING RECORD OF CERTAIN ( J TRANSMISSICN LINES . JANUARY 1. 1976 THRU MAY 13. 1977 I
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Pratt & Whitnev - Ranch No. 2 2h0kV Line r p No operations . j "h i Midway - Ranch 2f+0kV Line (Formerly Micaay - Pratt & Whi tney No, i and i Pratt & Whienev - :tanch No. 1 No operations t I f i N a r
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STATEMEfiT ISSUED BY FLORIDA POWER & LIGilT,: MAY 16,,1977 ./ UU
! ~CONCERNING POWER OUTAGE r: V' ! l i X l $( , According to a continuing investigation by Florida Power & Light ' as to the cause of Monday's powerioutage; company officials said thatt 5 'i a faulty relay' switch in the protection system caused Turkey Point Uniti \ 03 to trip off. the line at 10:12 a.m: r -
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This loss of generation was routinely abso'rbed by the FPL system as other generating unitsimaintained power output for 12 minutes- follow-ing the Turkey: Point trip. - At approximately 10:24 a.m. , a combination af factors tri'gered g i a cascading effect which resulted in the loss of p )wer to the: southeastern portions of FPL's system. The.St. Lucie Uniti#1 was tripped manually' at 10:24 a'm. when.i operators became concerned with wide fluctuations in system 'vol tage. i - Thereafter, the Riviera,' Port Everglad'es and Laudeiale plants tripped off automatically', along.with the two Turkey Point fossil fuel units. . l Another-contributing factor appears to have been the out-of-service. status of a new 500 KV line linking Fort Myers and. Andytown.s on U.S. 27 and State Road 84 west of Fort Lauderdale.1 The line, which had been ( converted from 230 KV to 500~ KY,:was operative, but was taken out of i ,~ service late Sunday night for testing. :The line is now in service.. First attempts to restore service were thwarted by a malfunction i at the Andytown station at 12:04 p'.m. < t FPL officials expect it may take several days to detennine the ' precise cause of the widespread' outage. ' ill . m @ ' l G.* )0a n i o L t~ From: fddad,. oM g; 5, A - y' /,w ,
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ML20084B732

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