How to solve the tripping of safety ceramic capacitor switch?

1.The installation of overload protection in each grouping circuit is due to the overcurrent protection safety ceramic capacitors are set when all the inputs, and the overcurrent phenomenon caused by the amplification of the grouping harmonic current is slow to react, or even does not react, therefore, the overload protection is installed in each grouping circuit, because the AC contactor can only break the load current under normal conditions, and cannot break the fault current, the AC contactor is replaced with a vacuum circuit breaker, and when the harmonic content is high, it acts on the trip to avoid the harmonic damage to the safety ceramic capacitor and the internal fuse blowing.

2.When the fuse in a certain phase of the safety ceramic capacitor is blown out, the capacitive resistance changes, and the compatibility resistance of the other two phases is unequal, resulting in an imbalance between the voltage of the fault phase and the sound phase.

Therefore, a voltage relay with a low setting value is installed at the opening triangle of the secondary winding of each grouping circuit voltage transformer, when the fuse in one phase is blown out, the unbalanced voltage appears at the opening triangle, and an alarm signal is issued, this device can accurately reflect the internal fault of the safety ceramic capacitor, and is not affected by the system grounding and the system unbalanced voltage, and the injured safety ceramic capacitor will be withdrawn from operation in time.

3.Regular measurement of capacitance In view of the difficulty of capacitance measurement, advanced measurement equipment has been purchased, and a fully automatic capacitor bridge is used to regularly measure the safety ceramic capacitor bank, and the capacitance of a single safety ceramic capacitor does not need to be disassembled, and the measurement is simple and fast, accurate and reliable.

Maintenance personnel regularly carry out capacitance measurement, when a certain phase of the safety ceramic capacitor after the fuse is blown, the capacitance will change, when the measured capacitance is reduced, more than 3, the injured safety ceramic capacitor will be withdrawn from operation in time.

Negligence in design and maintenance may bring hidden dangers to the safe operation of safety ceramic capacitors, therefore, it is necessary to configure perfect protection, regularly measure capacitance, and prevent micro problems, so as to reduce or even avoid the expansion of safety ceramic capacitor accidents, improve the availability rate of safety ceramic capacitors, and prolong the service life of safety ceramic capacitors.

Ceramic capacitors are capacitors with ceramic dielectric materials, which refer to capacitors made of high dielectric constant capacitors with barium titanate ceramic extruded into a tube, disc or disc as a medium, and silver plated on ceramics as electrodes by burning permeation method.

For example, the material has Y5V, Y5U Y5P, etc., which represent the E characteristics of ceramic capacitors, F characteristics, and B characteristics respectively, in the temperature range of -25 degrees +125 degrees, the temperature change rate of different materials is different, so the same product is used in different environments, and different products require different materials.

The capacity is the capacity of the capacitor, that is, the amount of electricity that can be stored, 1F (farad) 1000mF (millifar), 1mF (millifar) 1000uf (microfar), 1uf (microfarther) 1000nf (nanofar), 1nf (nanofar) 1000pf (picofar).

The capacity errors are m, k, j, etc., which represent plus or minus percent respectively.

Two. 10. Plus or minus 10%.

10. Plus or minus five percent, which refers to the error range of the capacitance. Pin pitch p and pin length l, which refers to the spacing of the capacitor pins and the length of the capacitor pins, the common ceramic capacitor pin distance has , and the common ceramic capacitor pin length has .

Method 1, after the circuit is open and disconnected, it is forbidden to forcibly send power, be sure to detect the status of the protection measures, and determine the sequential detection according to the condition of the measures, switch voltage capacitors, power series cables, detect whether the capacitors have burst slurry, serious heating, whether the protruding or oil-injected poly joints are overheated and melted, and whether the iron pipe has traces of charge offset. On the contrary, it is necessary to ensure the comprehensive current conductor test and the voltage capacitor to carry out the characteristic test, if the obstacle is still not detected, the intermittent capacitor is checked and tested, and the switch cannot be turned on before the assessment.

Method 2: When testing and solving the problem of the capacitor, the capacitor switch and the brake knife on both sides should be opened, and the capacitor bank can be implemented after the charge is canceled.

After the capacitor bank is offset by the discharge resistor charge, the local residual charge may not be discharged, and an artificial discharge is still carried out.

When discharging, the grounding terminal is connected, and then the capacitor charge is offset repeatedly with a ringer rod until there is no spark and no discharge sound, and then the grounding device is stabilized.

The capacitor switch trips the tripping side on the power element compensator, and then puts it in after closing. If the frequent tripping Yongxiang distributor focuses on checking whether the lower lead is loose, whether the circuit breaker itself can be normal, whether the capacitor can be damaged, the rated current of the circuit breaker should be 2-3 times the rated current of the capacitor capacitor, usually referred to as its ability to accommodate the charge for the capacitor, represented by the letter C. Definition 1:

A capacitor, as the name suggests, is a 'container for electricity' and is a device that holds an electric charge. Product Name: capacitor.

Capacitors are one of the electronic components widely used in electronic devices, which are widely used in circuits in terms of DC blocking, coupling, bypass, filtering, tuning loop, energy conversion, control, etc. Definition 2: A capacitor, any two conductors (including wires) that are insulated from each other and in close proximity to each other form a capacitor.