ML20074A265

Instructions for Inspecting,Adjusting &/Or Replacement of Parts for Obtaining Limit Switch Adjustments on Brown Boveri 7.5 Kv Through 15 kV,500 Through 750 MVA;5HK350,3000; All Hkv Breakers

ML20074A265
Person / Time
Site:	Zimmer
Issue date:	04/29/1983
From:	BBC BROWN BOVERI, INC. (FORMERLY BROWN BOVERI CORP.
To:
Shared Package
ML20074A255	List: ML20074A254 ML20074A265
References
10CFR-050.55E, 10CFR-50.55E, IB-8303, NUDOCS 8305120437
Download: ML20074A265 (4)

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April 29, 1983 _

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INSTRUCTIONS FOR INSPECTING, ADJUSTING AND/OR REPLACEMENT OF PARTS FOR OBTAINING LIMIT SWITCH ADJUSTMENTS ON BROWN B0 VERI 7.5KV THRU 15KV, 500 THRU 750 MVA; SHK350, 3000; ALL HKV BREAKERS IB-8303 0

8305120437 830429 PDR ADOCK 05000359 S PDR Arnwn Roveri Electric. Inc.

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18-8303

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INSTRUCTIONS FOR INSPECTING, ADJUSTING AND/OR REPLACEMENT OF PARTS FOR OBTAINING LIMIT SWITCH ADJUSTMENTS ON BROWN BOVERI 7.5KV THRU 15XV, 500 THRU 750 MVA; .

.. SHK350,.3000; ALL HKV BREAKERS

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.~(MANUFACTURED BETWEEN MARCH 1974 AND JULY 1978 INCLUSIVE)

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- -1. - GENERAL' -

1.1 For general breaker instruction, refer to the appropriate Brown Boveri Instruction Bulletin.

1.2 The breaker must be removed from the switchboard.

1.3 Unless otherwise stated, the breaker is to remain open with closing springs discharged.

1.4 The reason for a gap at Dim. "A" is to insure the "LSa" contact is made.

The gap at Dim. "B" is to insure that the "LSb" contacts are made and to limit the overtravel of the lever so that the limit switch plastic carrier inside the control relay is not broken.

1.5 This Instruction Bulletin supersedes IB-7803.

2. INSPECTION 'AND ADJUSTMENT FOR DIM. "A" (See Fig.1) 2.1 Charge the closing springs electrically or manually.

2.2 Check Dim. "A" with feeler or pin gages.

2.3 If required, readjust the screw (4) to Dim. "A" after first loosening .

the jam nut (5) and then retightening the jam nut after the adjustment.

2.4 Close and open the breaker to discharge the closing springs.

3. INSPECTION AND ADJUSTMENT FOR DIM. "B"(See Fig!s 1 and 2) 3.1 For this procedure, the breaker is to be open and the closing springs discharged.

3.2 C, heck Dim. "B" with feeler or pin gages. (See Fig. 2) .

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3.3 If Dim. "B" is not within dimensions, it is necessary to shim the lever stop(7) up or down as required. This is done by adding or removing shims (2) at the lever stop. (See Fig.1) Note that if all shims are removed and the Dim."B" still exceeds the max. allowed, the length of the lever stop should be checked.

The lever stops cade after July 1978 are 217/32 long. Previous to this, the length was 2 25/32. If required, install the shorter lever stop (7).

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.4. NEW PART NUMBERS -

Oty. Per Breaker Notes .

2. Shim 650451-A27 . As req'd (3 est.)

7. Lever stop 193392-A 1 217/32 overall length.

- Used in breakers built after July 1978.

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.. 18-8303 B._B_C u,s, ADJUSTING .

S, CREW &

CONTROL LOCXNUT PAN 2 SCREWS 5/15-18 AND LOCXNUTS L. WASn,.

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, LEVER DIM. "A" [ @ ASSY.

1/15-3/32 LIMIT SWITCH / '

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SPRING LEVER MOUNTING

@ LEVER STCP " 3RACXET O

2 SCREWS AND L. WASHERS TRU ARC RETAINER, OPPOSITE SIDE F

, POSITION SHOWN WITH g

N, CLOSING SPRINGS CHARGED.

FIG, 1 ~

-- DIM.

! "B" l 1/64-1/16 i POSITION SHOWN WITH CLOSING SPRINGS DISCHARGED.

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Brown Boveri Electric, Inc.