Current transformer open-circuit fault handling, country hair electrical switch factory, www.guofadq.com 15957745520
Current transformer in our work and life are widely used, its main function is to numerically larger a current through a certain ratio conversion for smaller values of two current, protection, measurement and other uses. In the daily life, easy to present current transformer open-circuit fault, so understanding how processing is very important.
Let me know what is the two open circuit fault, in the event of two open circuit occurs, then a current will be used for excitation, the core is saturated. At the same time an alternating magnetic flux in the two coil induced on a very high voltage, the peak of up to several thousand volts or even tens of thousands of volts, apparently so high voltage is applied to the two secondary coil and the two loop, will be for the personal safety and equipment safety with disastrous consequences, coil insulation will overheat and burn out. So the" Regulations" provisions, current transformer in operation is prohibited. So if there were two open circuit fault, how should we check and treatment?
Through the following points to determine whether there are two open circuit fault
The 1 circuit whether the indication of the instrument is abnormal, and generally appear as a reduced or zero. For measuring meter current open circuit. If the meter speed slow or not. If the meter indication from time to time, then the current transformer in half open state ( bad). Should be vigilant.
2 current transformer body has no noise, vibration is uniform, is there a severe fever, smoke and other phenomena, of course, these phenomena is not apparent in the load hours.
The 3 current transformer two loop terminals, element head without discharge, spark phenomenon.
The 4 relay protection misoperation or maloperation. This can be in the tripping or override trip when found and treatment. Meter, relay smoke burning. And reactive power meter and meter, telecontrol device, protection device of transmitter relay burn, will cause the current transformer two.
Then said that how to deal with the two open circuit fault
1 found the current transformer two open, should distinguish the fault of a group of current loop, open phase protection, to have an effect, and report to the dispatcher, lift may malfunction protection.
2 to reduce a load current, if the current transformer damage, should transfer the load, power check processing, such as a bypass state, can be used to bypass power supply, ensure power supply.
2 try at the nearby test terminal, a current mutual inductor is the two short circuit, then check processing open circuit, short circuit should be used when short circuit for short, short circuit should be reliable, prohibit using fuse or general wire winding. According to the drawings.
3 note the shorted phenomenon, if short circuit when short circuit spark, is effective, fault point on the short contact the following circuit, can further find, if short circuit without spark, may be shorted invalid. Fault point in a short contact before the loop, can point forward transform short contact, narrowing the scope, to clear the open circuit point
5 in the fault range, should check the easy failure of terminals and components, check circuits have work touched part. To check out the fault, can handle can be processed immediately, and then put out of the protection, if open in the transformer body of the terminal, should cut processing. If you can't handle or unable to identify the fault, should report, send professional repair personnel check processing. This should be the current transformer two short-circuit, or transfer of load, power failure processing.
Obviously, how to deal with current transformer open-circuit problem involves not only the basic composition of knowledge, but also need to understand the causes of fault, and has a professional repair experience.
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