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How to deal with high voltage switch tester tips

time:2020/9/14   source:华天电力  reading:262 time

The high voltage switch tester prompts "output short circuit or excessive load, please turn off and check the control wiring" problem analysis:


(1) The control wiring is wrong, which causes the output of the instrument to be short-circuited, which causes the short-circuit protection function to start, and the instrument has no output from the “close and open control power supply”.


Solution: After shutting down, refer to the above item 1 and 1 to recheck the wiring.


(2) The field coil load is too large and the instrument cannot be driven normally


Circuit Breaker Analyzer.png


Solution:


①For the switch of the electromagnetic mechanism, the driving current required by the switch closing coil is very large (up to 100A or several hundred amperes), and the maximum load capacity of the operating power supply of the high voltage switch tester is 20A. The load is too large and the instrument cannot be driven normally. In the scene, the closing control line is generally connected to the closing contactor coil of the previous stage of the closing coil, the switch contactor is controlled to close by the instrument, and the contactor is used to drive the switch closing coil to make the switch act. Or use the "external trigger" method to close the switch.


②For the switch of hydraulic and spring mechanism, because the instrument has an output current greater than 6A, it defaults to "excessive load". Please take a look or use a multimeter to measure the resistance of the closing coil to confirm that the closing coil current is large. Then please check the wiring carefully to confirm that the closing output is not short-circuited, and then cancel the short-circuit protection function of the instrument for testing.


Note: After the short-circuit protection function of the high-voltage switch tester is cancelled, the output of the "closed and open control power supply" will not have the protection function. If the control power supply output is indeed short-circuited at this time, it may cause damage to the instrument control power supply! Please proceed with caution


The specific method is: power off → press and hold the button → power on until the "release button" screen prompt appears → release the button, the short circuit protection function is cancelled.


Note: As long as the high-voltage switch tester is shut down or reset, the short-circuit protection function will restart.


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