ML20113G558
| ML20113G558 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/12/1989 |
| From: | Fitzwater L, Hill D GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20092F288 | List:
|
| References | |
| CON-IIT05-192-000A-90, CON-IIT5-192-A-90, RTR-NUREG-1410 LO-LP-65501-04, LO-LP-65501-4, NUDOCS 9202210475 | |
| Download: ML20113G558 (21) | |
Text
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POWER GENE R A TIO N DEPARTMENT V00TLE ELECTRIC OENE R A TINO PLANT TITLE: dAIN CONTROL BCARD SWITCEER AND CONTROLE NUMBERt LO LP-65501-04-C PROGRAN LICENSED OPERATOR TRAIN!NG REVIE10N 4
AUTHORI L. FITEWATER/D. MILL DATEt 9/7/89 APPROVED:
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INSTRUCTOR OUIDELINES I.
LE$ SON FORMAT A.
Lecture with visual aids II.
MATERIALS A.
Overhead projector B.
Transparencies C.
White board with markers III.
EVALUATION A.
Written or oral exam in conjunction with othe:c lesson plans IV.
REKARKS Q
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PURPOSE STATEMENT l
FOL14 WING CONFLETION OF TE!S LESSON, TIE SIVDENT HILL POSSSSS CEO C C40WLEDOES OF MAIN CONTROL 80ARD SWITCESS AND CONTROLS SYSTEMATICALLY IDD.TIrad) FOR TIE PERFORMANCE OF LICENSED OPERATOR TASRS.
11.
LIS T O F O BJE CT1VES i
1.
Explain what is indicated by the red and green flags on the control switches for pumps with automatic start circuits.
2.
Describe the reopense of a pump to the receipt of an automatic start signal if the control switch is in the following positions:
(006000K612) a.
Auto pull-to-lock b.
Stop pull-to-lock 3.
state what is indicated by the following being illuminated above a control switch:
a.
Red light b.
Green light c.
Amber light 4.
Explain what is indicated by the presence of a green light with a red flag on a pump control switch.
Also state what is indicated by the presence of a red light with a green. flag. Describe what two basic actions an operator should take if this occurs.
5.
Explain what the control switch of an A0V is actually controlling.
6.
State the source of valve position indicating lights energitation/de-energitation.
7.
Describe which valves (in general) can be stroked by momentarily holding the handewitch to the OPEN or CLOSE position and releasing it to spring return to the NORMAL or AUTO position.
8.-
State which valves (in general) must have the handewitch held to the OPEN position during valve travel until.it is completely open.
2
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s LO-LP-65$01-04-C LIS T OF O BJE C TIVRs 9.
Explain what would cause both red and green lights to remain illuminated on a control switch for a motor-operated and air-operated valve.
10.
Explain how to place a typical Hagen auto / manual control station in the AUTO and MANUAL positions. Describe the use of buttons with the up and down arrows.
(FT 86.010) (191003K103) 11.
Explain what is meant to have manual track auto for a control system.
12.
Draw and label a typical large equipment load control circuit.
Include the followings a.
High voltage power supply b.
Handswitch (include positions) c.
Control power supply d.
Circuit breaker 13.
Describe the difference between a channel selector switch and a chanc.el defeat owitch.
14.
State the purpose of the following, as they relate to annunciator panels:
a.
Light color b.
Fisshing frequency c.
Audio frequency d.
Acknowledge button e.
Roset button f.
First out g.
Reflash 15.
Explain the function and operation of a typical speed controller used at Plant Vogtle. (191003K102) 3
0 i
LO-LP-65501-04-C REFERENCES i
1.
PLANT VOGTLE PROCEDURES 13431, 120 VAC 12 INSTRUMENT DISTRIBUTION SYSTEM 13432, 120 VAC NON-1E INSTRUMENT DISTRIBUTION SYSTEM 2.
TECHNICAL SPECIFICATIONS SECTION 1 (1.3, 1.5, 1.6)
SECTION 3/4,3 3.
VOGTLE TRAINING TEXT Cl! APTER 32 4.
PLANT MANUAL CHAPTERS 7-15 5.
DESIGN MANUAL i
SECTION DC-1600 i
CONTROL SECTION (VOL 1) 6.
P& ids, LOGICS, AND OTHER DRAWINGS NONE 7.
VENDOR MANUALS AND OTHER REFERENCES WESTINGHOUSE TRANSIENT AND ACCIDENT ANAf? SIS, VOL 1 1X6AU01-262 INSTRUCTION MANUAL FOR PRG'.ESS CONTROL SYSTEMS 1X6AU01-526 PROCESS INSTRUMEh.'ATION AND CONTRO!.
1X6AUO1-527 PROCESS INSTRUMENTATION AND CONTROL 1X6AA04-30 PRECAUTIONS, LIMITATION, AND SETPOINTS 8.
FSAR 1.2 SECTION 7.0 9.
COMMITMENTS AND OTHER REQUIREMENTSt FF 86.010 DEVELOP LP FOR ALL CONTROLLERS USED AT VOGTLE 10.
INSTRUCTIONAL UNITS: NONE 11.
TRANSPARENCIES LO-TP-65501-001 OBJECTIVES LO-TP-65501-002 AUTO / MANUAL CONTROLLF,R LO-TP-65501-003 REMOTE BREAKER TRIP 3CHEME 4
_ _ -, _ _, _ _ _.. ~
I LO-LP-65501-04-c 111.
LESSON O U T LIN E NOTES 1.
INTRODUCTION A.
Many control switches on the main control board 1.
Putye 2.
Heaters 3.
Valves 4.
Annunciators B.
All need to be oportted at ona time or another C.
Being able to recognize status is important D.
Present Object **es LO-TP-65501-001 II.
PRESENTATION A.
Pump Control Switches 1.
Most common is spring return to Auto or Normal a.
Used on most motors (attached tn pumps, etc.)
b.
L shaped handle 2.
Can be in four status modes a.
Auto-after-pr. art or Normal-after-start Objective 1 1)
Red flag b.
Auto-after-stop cr Normal-after-stop
- 1) Green flag c.
Stop Pull-to-Lock (PTL) Objective 2a Objective 2b
- 1) Green flag
- 2) Automatic start signal disabled Emphasite d.
Auto Pull-to-Lock Air compressors
- 1) Automatic start signal enabled Air removal pumps
- 2) Green flag Turning gear 3.
Threo lights normally above pump controls 5
1
LO LP-65501-04-c III.
LESSON O U T LIN E NOTES a.
Red - breaker closed - pump running Objective 3a b.
Green - breaker open - pump htopped Objective 3b c.
Amber - breaker open - pump stopped objective 3c
\\
1)
Pump was running
- 2) Control switch in Auto after start or
[
Normal-af ter-ste '. ;
3)
Indicates pump tripped (Auto etop) a)
Moto. protectic-
.z 3
b) Low tank level c) Other system parameter abnormal 4)
Placing control switch to Auto or Normal after stop turns out light d.
Other light above control owitv.es (typical indicator) 1)
Indicate auto start, oil pumps running, etc. (blue, white) 4.
C:secking status of control Switch a.
Pump running
- 1) Red flag - Auto after start Ohiective 1
- 2) Red light lit - breaker closed b.
Pump stopped 4
- 1) Green flag - Auto after stop Objective 1
- 2) Green light lit treaker open c.
Stop Pull to Lock
- 1) Pump disabled a)
Should not to ranning b) Normal cleararre position c)
Could be a Te'*
ipec violation d.
Flag - Light mismaten Objective 4
- - - - - - - - - - ' - - - - - - - - - - - - - - - - - - ' ^ ^ - - - - - - - - - - - - - - - - - - - - - ' '
~ ~ ~ ~ ~ ~
e-LO-LP-65501-04-C
!!I.
LESSU N O U TLIN E NOTES 1)
Red flag green light i
a)
Pump stopped automatically (1) Araber light may be burned out b)
Should green flag the control Note Actions (by placing handewitch to Stop)
Match flag and and investigate and investigate 1
- 2) Green flag - red light L
a)
Pump started automatically b)
Should red flag the control and Unless intended investigate auto start to cycle (1) Another pump tripped (2) Safeguards actuation D.
Valve Control Swltches 1.
Normally two types of valves a.
Motor operated valves (MOV) b.
Air operated valves (AOV)
Objkctive 5
- 1) Control switch controle solenoid in air line a)
Directs air to top / bottom of diaphragm actaator to move valvo 2.
Close-Auto-open spring return to auto a.
Common type of control b.
T shaped hancle 3.
Two lights above control switch a.
Red light only - indicates valve open b.
Green light only - indicates valve closed c.
Both lights lit objective 6 l
- 1) Valve in midposttion d.
Lighta really indicate NOT position L
7 l
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LESSON O U T LIN E NOTES
- 1) Red light - valve not closed
- 2) Green light - valve not open 3)
Done with limit switches objective 5 4.
Valve Opening a.
Isolation MOV 1)
Place control switch to open position objective 7 2)
Release when red light lights (green and red on) o 3)
Valve will travel full open a) Cannot stop cycle with switch
- 4) Green light goes out b.
Isolation A0V Objective 8 1)
Place control switch to open position This is for a fall closed 2)
Hold until green light goes out valve.
ControA switch would work opposite for, fail
- 3) Valve vill reverse and go closed if open valve switch released while green light lit 5.
Common Problems a.
Both lights on indefinitely objective 9
- 1) MOV a) Valve is a throttle valve b) Valve tripped on thermal overload c) Valve torque switch tripped 2)
A0V a) Valve is throttle valve b) Shaft stem rotation - neither limit switch made b.
Both lights off 8
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LO-LP-65501-04-c III.
LESSON O U T LIN E NOTES 1)
MOV breaker tripped 2)
Light bulb burned out C.
Hagen Auto / Manual Controller Stations LO-HO-65501-003 f
LO-TP-65501-002 1.
Three pushbuttons a.
Up arrow objective 10 1)
Increases controller output 2)
Only in manual b.
Down arrow Objective 10 4
l 1)
Decreases controller output 2) only in manual c.
Auto / man 1) selacts mode of control 2.
Present output meter (0-1004)
Indicates controller output in Auto or a.
Manual 3.
Controllers normally control valves a.
Some other applications 1)
PD pump speed 2)
Feed pump speed 3)
Steam dumpe b.
To convert percent output to valvo position only valid if valve working 1)
Fail open valve - 100% - closed properly. Immed-Late position may 2)
Fall closed valve - 100% - open not be propor-tional to percent output 4.
Manual Tracks Auto objective 11 a.
Manual output = Auto output when selected 5.
Operation 9
Lo-LP-65501-04-c.
211.
LESSON O U T LIN E NOTES a.
Determining setpoint potentiometer setting setpoint pot is not to be used
- 1) As a rule, controllers with setpoint ar a " throttle".
pot, are related to a meter of some That's why variety there's a "RANUAL" mode 2)
Setting is based on desired control point of meter using 10 turn pot.
(0-100% of meter scale)
- 3) Examples
- c. )
controller associate with 0-600 peig meter (1) Desired setpoint 350 psig (2) 1 ;f meter scale =
112 x 100% = 58.3%
600 (3)
Pot, setting should be 5.83 (5.83 turns on pot) b) Work other exkmples as necessary Start FF 86.010 b.
shifting controllers from Auto to Manual objective 10 and from Manual to Auto 4
- 1) Auto to Manual a)
Push Auto / Man pushbutton b)
Push up or down pushbutton
- 2) Manual to Auto a) Match demand to setpoint Always b)
Push Auto / Man pushbutton c) Ensure controller controla properly in Auto c.
Manual control using 7300 type controllers
- 1) Manual control is ALWAYS with the NEVER with the
+
up/down pushbuttons pot.
10
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LO-LP-65$01-04-C III.
LESSON O U T LIN E NOTES
- 2) Controller must always be in the Different than MANUAL mode to use up/down pushbuttons Hagan controllers (differs from Hagan controller)
(use if up/down pushbuttons placed in mode to man)
- 3) Caution - desired outcome does not Ex: Using up always match direction of controller pushbutton does not necessarily raise value,
- 4) Caution - demand position does not could be control-always follow direction of controller ling a process parameter.
Ex:
Temp
- 5) Experience will dictate response of Ex: Demand indi-controller cation may go down as "up" puenbutton is used End FF 86.010 D.
Other Types of Control Switches 1.
Electrical feeder breakers a.
Most sLmilar to pump switches b.
Green-amber-red lights
- 1) Green light - breaker open c.
Some have synchronizing switches becide control switch
- 1) Must be on to close breaker
- 2) Energizes sync circuit h) Synch check bypass d.
Typical remote controlled breaker circuit objective 12 1)
High voltage power supply (typically Would be large anything above 1:ov; size, have to be spring operated, a) Would be impcssible to have a require large control swit:n large enough to supply cables make/ break inis voltage 2)- Control power e4 p./ (125 VDC) e
o o
a LO-LP-65501-04-C III.
LESSON O U T LIN E NOTES a)
Supplied to control switch from LO-HO-65501-002 125 VDC bus Pg. 2 LO-TP-65501-002 b)
Close or open circuit completed by handswitch on MCB c)
Complete open/close circuit energize coil in circuit breaker and moves slug to trip the closing latch or to trip the trip bar d)
Slug trips latch mechanism and Similar mechanism releases charged spring for closing uses charged spring e)
Spring quickly closes / opens for quick, forceful contacts in hi voltage line close f)
Spring is recharged by 125v to electric motor
- 3) Handswitch a) Completes 125v de open/close circuit b)
Removes de power from breaker control circuit when in Pull-to-Lock
- 4) Circuit breaker a)
Io actually a remote cont:211ed relay with a high voltage (line supply) and low voltage (control power) circuit 2.
On-Off switches a.
Simply place in desired position 3.
Transfer switches a.
Most arc found on remote shutdown panels
- 1) Control Room position - enable control room switches
- 2) Local position - disables control Notes Removes room controls, transfer control to interlocks assoc-remote shutdown panel (overrides lated with control control room) switches 4.
Defeat switch a.
Prevents selected parameter from being Objectivo 13 inputted to circutta (woually alarm and protective circuits) 12
4 4
LO-LP-65501-04-c III.
LESSON O U T L1H E NOTES 1)
Bistable trip switch Examples Tave channel defeat Emphasize dif-forence betwee, NIS channel defeat switch and defeat switches
- 2) Comparator trip switch on the NI's 5.
Selector switch a.
Selects char 4nel to be inputted (usually Objective 13 control circuits)
- 1) Steam generator water level control 6.
Pushbuttons a.
Various applications 7.
Transfer switches a.
Transfer control from one location to another
- 1) Remote shutdown panel (local / control room)
E.
Annunciators 1.
Provide operator warning of alarm condition 2.
Dark board philosophy a.
Everything normal - all lights out uxcept green tinted
- 1) only at 100% power May be normal to be lit at <100%
power 3.
Each set of annunciator panels has three sesociated pushbuttons a.
Ac knowledge b.
Roset c.
Test
- 1) causes all on that panel to alarm-light check 4.
Alarm condition a.
Horn sounds Objective 14c 13
LO-LP-65501-04-C l
III.
LESSON O U TLIN E NOTES b.
Window flashes quickly objective 14b c.
Operator should first identify alarm d.
Operator then depresses acknowledge push-Objective 14d button 1)
Korn stops
- 2) Window stops flashing - stays illuminated
- 3) operktor should respond to annunciator message in the annunclator response books 5.
Condition clears a.
Horn sounds - different pitch (bell on MCB)
Objective 14c b.
Window flashes slowly objective 14b c.
Operator identifies cleared condition d.
Depresses Roset pushbuscon objective 14e
- 1) Window light goes out 6.
First out annunciators objective 14f a.
After alarm acknowledged once, first out flashes facter (remains flashing quickly) b.
Two resets required to clear alarm
- 1) Operator must recognize first out before double reset 7.
Red annunciators Objective 14a a.
Indicates Safety Injection Actuations b.
Alarms requiring immediate operator action to protect the plant 8.
Green annunciators a.
Normally lit at power Indicate normal alarm at full
- 1) RCP bearing oil lift pump low power pressure (4) 14
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,4' LO-LP-65501-04-c
-- -III.i LESS O M O UTLINN NOTES-
- 2) SR Hi voltage failure 9.
Amber / Orange annunciators
. Indicate reactor trips or alarms warning the a.
i operator a potentially unsafe condition exista F.
Typical Speed Cantrol Circuit objective 15 1.
Functions to control speed of pump or motor 4
2.
Consists of multi-element controller through an automatic circuit 3._
Operation a.
The pump speed is caused to increase or decrease based on parameters monitored by the controller elements b.
Set speed compared to actual speed c.
Set speed determined by other parameters-i 1)
Program
- 2) Discharge pressure 3)
Flow signal d.
Set speed signal determined by control element
- 1). Delta P comparator
- 2) Delta flow comparator
- 3) -Program error comparator-Maeter control may be used if pumps. operated e.
in parallel 1
- III.
SUMMARY
cA. 'Take students to simulator if available and point outfreview controller manipulation, controller operation other than that covered by standard controllers will be covered where specifically
. called-for in systems training (DG, AFW LRW, etc.)
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LO-LP-65501-04-C III.
LESSON O U T LIN E NOTES B.
Review Objectives 1.
STATE WHAT IS INDICATED BY THE RED AND GREEN FLAGS ON THE CONTROL SWITCHES FOR PUMPS WITH AUTOMATIC START CIRCUITS
- Red flag - Auto After Start (Breaker closed)
- Green flag - Auto Af ter Stop (Breaker open) 2.
STATE THE RESPONSE OF A PUHP TO THE RECEIPT OF AN AUTOKATIC START SIGNAL IF THE CONTROL SWITCH I3 IN THE FOLLOWING POSITIONS:
a.
AUTO PULL-TO-LOCK Auto start signal enabled get green flag -
pump starts b.
STOP PULL-TO-LOCK Auto start signal disabled get green flag -
pump does not otart 3.
STATE WHAT IS INDICATED BY THE FOLLOWING BEING ILLUHINATED ABOVE A CONTROL SWITCH:
a.
RMD LIGHT Breaker closed - pump running b.
GREEN LIGHT Breaker open - pump stopped c.
AMBER LIGHT Breaker open - pump stopped 4.
STATE WHAT IS INDICATED BY THE PRESENCE OF A GREEN LIGHT WITH A RED FLAG ON A CONTROL SWITCH. ALSO STATE WHAT IS INDICATED B7 THE PRESENCE OF A RED LIGHT WITH A GREEN TLAG.
STATE WHAT TWO BAS!C ACTIONS AN OPERATOR SHOULD TAKE IF THIS OCCURS Red flag - green light
- pump automatically s *. o p ped
- action - match flag and investigate
4 LO-LP-6f501-04-C III.
LESSON O U T LIN E NOTES Green flag - red light i pump started automatically
- action - match flag and investigate 5.
STATE WHAT THE CONTROL SWITCH OF AN AOV IS ACTUALLY CONTROLLING Solenoid valve 6.
STATE THE SOURCE OF VALVE POSITION INDICATING LIGHTS ENERGIZATION/DE-ENERGIZATION Limit switches 7.
STATE WHICH VALVES (IN GENERAL) CAN BE STROKID BY MOMENTARILY HOLDING THE HANDSWITCH TO THE OPEN OP. CLOSE POSITION AND RELEASING IT TO SPRING RETURN TO THE NORMAL OR AUTO POSITION MOV will generally stroke by momentarily holding handewitch to open or closed (some excepti.ons exist) 8.
STATE WHICH VALVES (IN GENERAL) MUST HAVE THE
'HANDSWITCH HELD TO THE OPEN POSITION DURING VALVE TRAVEL UNTIL IT IS COMPLET:llLY OPEN AOV 9.
STATE WHAT WOULD CAUSE BOTH RED AND GREEN LIGHTS TO REMAIN ILLUMINATED ON A CONTROL SWITCH FOR A MOTOR-OPERATED AND AIR-OPERATED VALVE HOV Valve travel at intermediate position Limit switches incorrectly set AOV Valve travel at intermediate position Limit switches incorrectly set
~
LO-LP-65501-04-C III.
LESSON O U TLIN E NOTES 10.
STATE HOW TO PLI.CE A TYPICAL HACEN AUTO / MANUAL CONTROL STATION IN THE AUTO AND MANUAL POSITIONS, DESCRIBE THE USE OF BUTTCNS WITH THE UP AND DOWN ARROWS (FF 86.010)
Auto to Manual Press the split lens manual button The manual half of the split lens will illuminate Manual to Auto Match setpoint and demand Use manual increase / decrease buttons ao needed Press cplit lens auto button 12.
STATE WHAT IT MEANS TO HAVE MANUAL TRACK AUTO FOR A CONTROL SYSTEM Ensures a bumpless transfer when switching from auto to manual Advantage - ensures a bumpless transfer when uwitching from auto to manual 12.
DRAW AND LABEL A TYPICAL LARGE EQUIPMENT LOAD CONTROL CIRCUIT.
INCLUDE THE FOLLOWING:
a.
HIGH VOLTAGE POWER SUPPLY b.
HANDSWITCH (INCLUDE POSITIONS) c.
CONTROL POWER SUPPLY d.
CIRCUIT BREAKER Refer to LO-TP-65501-003 13.
STATE THE DIFFERENCE BETWEEN A CHANNEL SELECTOR SWITCH AND A CHANNEL DEFEAT SWITCH Channel defeat switch prevents selectad para-meters from being inputted to circuits Channel selector switch eslects an instrument to input to the circuits la
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l Lo-LP-65501-04C
-j
' III. : LESSON O U TLI N E NOTES.
i 14..
STATE THE PURPOSE OF THE FOLLOWING, AS THEY REIJ.TE TO ANNUNCI ATOR PANELS a.
LIGHT COLOR Red annunciator indicates safety injection Amber / Orange indicates reactor trip b.
FLASHING FREQUENCY Flashes quickly on alarm c.-
AUDIO FREQUtNCY Horn sounds on alarm Horn' sounds - different pitch on clear (bell on MCB) d.
ACKNOWLEDGE BUTTON Pressed to acknowledge alarm Horn stops, window stops flashing e.
RESET BUTTON When pressed light goes out
'f.
FIRST OUT Tells operator which alarm caused trip-first First out flashes after acknowledge
-(romain2 flashing quickly)
Two resets required to clear-alarm-g.
REFLASH When slow flash changes to rapid-Flash indicates the alarm condition came in again p
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LESSON O U T LI N E NOTER 15.
EXPLAIN THE FUNCTION AND OPERATION OF A TYPICAL SPEED CONTROLLER USED AT PLANT VOGTLE.
Function - control speed of pump or notor through an automatic circuit operation - set speed determined by control elements using a comparator circuit monitoring plant parameters.
Set speed is compared t e actual speed to give speed error.
Speed error signal causes pump controller to increase or decrease pump epeed based on error signal
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20
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+
PROCESS INSTRUMENTATION AND CONTROL C.
INDICATIONS AND ALAKMS 1.
Annunciators Annunciators are found en local control panels and in the control-room, and are controlled by the operator using three control buttons.
An alarm is indicated by a quickly flashing window with an accompanying horn. After identifying the alarm, the operator presses the Acknowledge button, which causes the window to stop flashing (remains illuminated if alarm conditions still exist) and the horn-to stop.
The operator should then investigate the alarm.
If he can clear the condition, a bell will sound, and the window will_begin flashing, but more slowly than before.
Prossing the Reset button causes the alarm window light to go out.
If at any time a slow flashing alarm begins flashing rapidly again (called reflash), the initiating condition has occurred again.
First out annunciators are-found only in the control room and are designed to provide the operator with information as to what has caused a reactor trip. As many alarms almost simultaneously appear immediately following a reactor trip, it would be dif ficult to determine the cause of the trip if a first out system were not implemented. Following_a_ trip, after the alarm is acknowledged once, the first out flashes faster than the other alarms. Two resets are required to clear a first out, so the operator must identify the first out no later than one reset.
Annunciators illuminated in red on the MCB indicate reactor trip / turbine trips. Green lit windows indicate those normally lit at 100 percent power.
(5 total: RCP bearing oil _ lift pump low pressure (4), and the SR high voltage failure). Normally there should be no other alarms lit at 100 percent power on the MCB during normal operation.
2.
Bistable Status Panels These_ boxes of small,_ square light cubes appear in various locations around the control board. Each is labeled to display a related group of bistables. The. individual cube represents a bistables condition: lit is trippcd, and not lit is not tripped.
An example is the status panel of the steam generators, which
-includes parameters such as the Hi/ Low level trip bistables, Hi/ Low pressure bistables, etc.
The panel rows and columns are arrenged as instrument channels and process channels. An example is the steam generator level channels (4).
A column lists the channels in order (I, II, III, IV).
Therefore, an operator can, at a glance of the status board, tell if a trip coincidence is present.
It is also very,useful for monitoring bistable status during testing.
A trip coincidence-that exists on the status board without auto action should be sized up quickly by the operator, and a manual j
trip actuated, if necessary.
hccident Monitoring Instrumentation 32-40 Revision 2
_