3 Description
3.9
Reference Contact IK-3
3.9.1 Introduction
Attention
The warnings in the operating instructions for high-voltage circuit-breakers must be observed! Work
may only be performed at the reference contact in the OPEN position with the closing and opening
springs relaxed.
Discharge the closing and opening springs:
- Disconnect motor power supply,
- Open circuit-breaker (from closed position),
- Close the circuit-breaker,
- Re-open the circuit-breaker.
The reference contact is connected mechanically to the interrupter unit of a high-voltage circuit-breaker and
serves for indirect determination of the switching time/ inherent switching time.
The reference contact is tripped by the operating mechanism of the circuit-breaker.
The difference in time between switching the interrupter unit and the output signal of the reference contact is
recorded in the test document.
There is no direct mechanical connection with the circuit-breaker's contact system.
FA Operating
mechanism
RK Reference
contact
UE Interrupter
unit
Fig. 23
Function diagram of the IK-3
The IK-3 is a non-contact contact system consisting of a Hall Effect sensor with actuating magnets. The Hall
sensor is the fixed part and the magnet the moving part of the contact system.
38
