ABB VM1 Installation And Service Instructions Manual
Also see for VM1: Installation and service instructionsManualInstruction manualInstruction manual
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Contents
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1886572341.21.31.11101196. Description6.1. Basic structure of the withdrawablecircuit-breaker (Fig.10a)The withdrawable truck (9), consists of a steel sheet structurewith wheels (3), on which the circuit-breaker with the relativeauxiliary components, the isolating contacts (10) for electricalconnection with the switchgear and the multi-pole secondaryconnector (1) for connection of the circuit-breaker auxiliarycircuits are installed.After having been racked into the switchgear and hooked up,the withdrawable circuit-breaker can take up the followingpositions: racked-out, isolated for test (with connectorinserted) and racked-in. The racked-in circuit-breaker isautomatically earthed by means of the truck wheels.The magnetic actuator of the circuit-breaker and therelative controls and indicators, are accessible from thefront. Withdrawable circuit-breakers of the same type andcharacteristics are interchangeable.However, the code of the connector prevents incorrectcombinations between the circuit-breaker and switchgear.fig. 10a6.2. Circuit-breaker structure of thecircuit-breaker (Fig.10b)The encapsulated poles are installed on the rear flat section ofthe circuit-breaker frame (1.1. Fig. 10a). The live parts of thecircuit-breaker poles are enclosed in cast resin and protectedfrom impacts and other external influences.With the circuit-breaker closed the current path for each poleleads from the upper circuit-breaker terminal (1) to the fixedcontact (2a) in the vacuum interrupter (2), then via the movingcontact (2b) and the flexible connector (5) to the lower circuit-breaker terminal (4).The change of contact state is delivered by means of theinsulated link rod (7) with internal contact force springs (6).1. Secondary plug connector1.1. Breaker frame1.2. Front Plate1.3. Slot for handling, both sides2. “Ready” indicator3. CLOSE push- button4. OPEN push-button5. Mechanical operating cycle counter6. Mechanical CLOSE/OPEN indicator7. Rating plate8. Socket for emergency manual operation9. Truck10. Primary isolating contacts11. Wheels |
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