Ge-industrial-solutions Power-Vac ML-20 Mechanism Manuel d'utilisateur

DEH 40368 Instructions g PowerVac ® Vacuum Circuit Breaker with ML-20 Mechanism

10 Figure 5 Gag plate installation 1 Closing spring gag plate 2 Manual charging lever 7.3—Closing Spring Gag Insert the closing spring

11 SECTION 8—Dimensional Checks With the breaker closed and the gag plate installed, perform the following dimensional checks. 8.1—Primary Contact

12 8.4—Close Coil Plunger Gap The close coil plunger gap is shown in Figure 8. With the closing spring discharged, operate the plunger to make certai

13 Figure 10 Control switches LCS Switch

14 SECTION 9—Electrical Checks Electrical checking consists of electrical breaker operation primary and secondary wiring high-potential testing (if

15 ground of the test machine or by applying a grounded cable to the phase bus bars. If a failure of a vacuum bottle should incur during the integri

16 SECTION 10—Checking and Installing Breakers CAUTION: IF THE COMPARTMENT SECONDARY CON- TROL CIRCUITS ARE ENERGIZED, THE FOLLOWING PROCEDURE SH

17 SECTION 11—Maintenance WARNING: BEFORE ANY MAINTENANCE WORK IS PERFORMED, MAKE CERTAIN THAT ALL CONTROL CIRCUITS ARE DE-ENERGIZED AND THAT THE B

18 11.8—Lubrication Proper lubrication is important for maintaining reliable circuit breaker performance. The ML-20 mechanism uses bearings which hav

19 SECTION 12—Timing Timing and speed checks are optional and also depend on the level of maintenance performed. Generally these tests are not requi

2 PowerVac ® Vacuum Circuit Breaker with ML-20 Mechanism Table of Contents Description Page SECTION 1−−−−Introduction...

20 SECTION 13—Opening and Closing Speed The opening speed is modified by moving the spring adjusting nuts on the opening spring assemblies. A change

21 SECTION 14—Repair and Replacement 14.1—General The following information covers in detail the proper method of removing various parts of the brea

22 Perform the operation in the following sequence: 1. Charge closing spring and install gag plate. 2. Depress the close and then the trip buttons

23 SECTION 15—Renewal Parts It is recommended that sufficient renewal parts be carried in stock to enable the prompt replacement of any worn, broken

24 Reference DIMENSIONAL CHECKS for breaker position and spring status. 16.5—Close Coil Plunger To adjust the close coil plunger gap, Figure 8, lift

25 Figure 14 Toggle linkage positions of the ML-18 mechanism (Viewed from right side) Continued on next page (A) Breaker open - spring discharge

26 Figure 14 Continued (C) Breaker closed - spring discharged (D) Breaker closed - spring charged

27 Figure 15 Schematic of ML-20 mechanism 1. Close spring 12. Output crank 2. Cam shaft 13. Cross shaft 3. Manual charge

28 Figure 15 Continued Partial View A Partial View B

29 Figure 16 Typical wiring diagram for ML-20 mechanism

3 List of Illustrations Figure Page 1 Front view of PowerVac® breaker with front cover... 6 2 Rating interference plate...

30 Figure 17 PowerVac breaker left-front view 1. Gag interlock angle 2. Track rollers 3. Positive interlock bar 4. Closing spring disch

31 Figure 19 Trip coil and linkage 1. Trip coil 2. Closing spring 3. Trip linkage adjusting rod and nut 3

32 Figure 20 Close coil linkage 1. Close linkage adjusting nut 2. Close linkage adjusting rod 3.

33 Figure 21 Bottom view of ML-18 mechanism 5 1. Closing spring 10. Pivot bolt 2. Opening springs 11. Int

35 *Install rivet in aligned holes with interlock roller, set at .670 and striker making contact with adjusted trip coil rod. CAUTION: This is a

35 TABLE 2 MEASUREMENTS ITEM BREAKER CL. SPRING OP. SPRING MEASUREMENT PG. CONTACT WIPE OPEN CLOSED CHARGED CHARGED DISCHARGED CHARGED MEASURE

36 INDEX A Adjustments (Table 3) 35 Auxiliary Switch Replacement 22 C Close Coil Plunger 24 Close Coil Plunger Gap 12, 24 Close Latch Stop Bo

USER REPORT NO. FAILURE REPORTING FORM FOR POWER CIRCUIT BREAKERS Check all appropriate blocks and p

ADDITIONAL INFORMATION REQUIRED FOR ANALYSIS OF MAJOR OR SYSTEM RELATED FAILURE (USE ADDITIONAL PAGES AS NECESSARY) (1) Single line station diagr

Intentionally Left Blank

4 PowerVac ® Vacuum Circuit Breaker with ML-20 Mechanism SECTION 1—Introduction This manual provides the information needed by the user to properly

These instructions do not purport to cover all details or variations in equipment nor to provide for every possible contingency to b

5 SECTION 2—Description 2.1—General This section contains a description of the PowerVac® vacuum circuit breaker. It also describes the functions of

6 SECTION 4—Features 4.1—Safety Precautions This circuit breaker uses powerful springs for energy storage. WARNING: DO NOT WORK ON THE INTERRUPTE

7 4.2.3 Negative Interlock The function of this racking-track operated interlock (5, Figure 17) is to remove the trip latch from the trip roller the

8 SECTION 5—Operation 5.1—General The PowerVac® vacuum circuit breaker uses sealed vacuum power interrupters to establish and interrupt a primary c

9 the linkage to rise until the prop (11, view D) can slip under the close roller (10, view D) and hold the linkage in place. As the linkage moves, t