TK-500P Distribution Network Capacitance Current Tester

TK-500P automatic capacitance measuring instrument is also called distribution network current tester, power capacitance current tester, digital capacitance current tester and capacitance current tester. At present, my country's power distribution system

The neutral point of the power supply is generally not directly grounded, so when the line is single-phase grounded, the current flowing through the fault point is actually the capacitive current generated by the line-to-ground capacitance.

        According to statistics, a greater degree of faults in the distribution network is caused by too large capacitance when the line is single-phase grounded and the arc cannot be self-extinguishing. Therefore, my country’s electric power regulations stipulate that 10KV and 35kV systems

When the capacitance current is greater than 30A and 10A, an arc suppression coil should be installed to compensate the capacitance current. This requires the capacitance current of the distribution network to be measured to make a decision.

        In addition, the combination of the capacitance to ground of the distribution network and the parameters of PT will produce PT ferromagnetic resonance overvoltage. In order to verify whether the distribution system will have PT resonance and what kind of resonance will occur, it must be

The capacitance to ground of the distribution network must be accurately measured. The traditional methods of measuring the current of the distribution network include the direct method of single-phase metal grounding, the indirect measurement method of external capacitance, etc. These methods must touch the primary equipment.

The equipment has disadvantages such as dangerous test, complicated operation and low work efficiency. The TK-500P automatic capacitance current tester directly measures the capacitance current of the distribution network from the secondary PT, which is different from the traditional

Compared with the test method, the instrument does not need to deal with the primary side, so there is no danger of test, no need to do complicated safety measures and wait for lengthy scheduling commands, just connect the measurement line to the PT

The open triangle end of the can measure the capacitance current data. Since the weak inter-frequency test signal is injected from the PT opening triangle, it will not have any impact on the relay protection and the PT itself.

It avoids the 50Hz power frequency interference signal. At the same time, the output of the tester can withstand 100V AC voltage. If a single-phase ground fault occurs in the system during measurement, it will not damage the PT and test.

Therefore, there is no need to take special safety measures to make this work. The tester adopts large-screen LCD display and Chinese menu. The operation is very simple, and it is small in size and light in weight.

External operation, simple wiring, fast test speed, high data accuracy, greatly reducing the labor intensity of the test personnel and improving work efficiency.