Method for the contact resistance measurement by using the MIKO-1 instrument

  1. Connect the current ends (with "crocodiles") of the MIKO-1 cable to high-voltage leads (1 and 2), and the potential ends (needle-type) – to high-voltage lead-ins of the upper cover flange 3 and the intermediate flange 4 (Fig. 1). If the contacts of the circuit breaker are of socket type, and the measured contact resistance exceeds the rated value, perform mechanical break operations 5-10 times and repeat the measurement. If the resistance is still higher than normal, the circuit breaker must be repaired.
  2. мико 1.png

    Fig. 1

  3. Measure the contact resistance directly on the high-voltage lead-in 1 and the tie plate 2 (Fig. 2).
  4. Measure the contact resistance on the tie plate 2 and the load lead-in 3 (Fig. 2).
  5. Measure the contact resistance directly from the load terminal 3 to the high-voltage wire 4 (Fig. 2).

Fig. 2

If the contact resistances measured according to clauses 2, 3, 4 exceed the rating for this circuit breaker, disassemble the connection, clean, and lubricate the contact surfaces according to the instructions of the circuit breaker manufacturer.

We use cookies. By continuing to browse the site, you agree to the processing of your personal data and the Privacy policy.