Wuhan GDMK Electric Co., Ltd.
Overview:
Fully automatic capacitance measuring instrument is also known as distribution grid current tester, electric capacitor current tester, digital electric capacitive current tester, and capacitor current tester. At present, the power supply neutral point of the power supply system in my country is generally not directly grounded, so The current flowing through the fault point when the line is grounded is actually the capacitor current generated by the line to the ground capacitor.
According to statistics, the fault of the distribution network is caused by the large -scale capacitance when the line is grounded by the line. Therefore, my country's power regulations stipulate that when 10kV and 35KV system capacitor currents are greater than 30A and 10A, the arc anti -elimination coil should be installed to compensate the capacitor current, which requires measurement of the capacitor current of the distribution network to make a decision.
Parameter:
| Measuring range | Total capacitor to the ground =120 µF (three relative land) | |||
| Capacitor current =500A (35KV system) | ||||
| Capacitor current = 200A (10KV system) | ||||
| measurement accuracy | 0.5 µF ~ 5 µF ± 10%± 50 words | |||
| 5 µF ~ 90 µF ± 5% | ||||
| 90 µF ~ 120 µF ± 10% | ||||
| Operating temperature | -10 ~ 50 ? | |||
| Relative humidity | =90% | |||
| Working power supply | AC 220V ± 10% 50Hz ± 1% | |||
| Dimensions | 310 × 300 × 170 mm | |||
| Instrument weight | 10 kg | |||
Experiments were performed for the resonance of the power distribution system:
The combination of the ground capacitor and PT parameters of the distribution network will generate PT iron magnetic resonance overvoltage. In order to verify whether the power distribution system will occur in PT resonance and what kind of nature of resonance occurs, it must also
The tolerance value of the power distribution network must be accurately measured. The traditional method of measuring and distribution grid currents include the direct method of single -phase metal grounding, and the indirect measurement of capacitors. These methods must be exposed to the device, so there are shortcomings such as test danger, complicated operation, and low work efficiency. The TK-500P fully automatic capacitor current tester directly measures the capacitor current of the power distribution network directly from the PT. Compared with the traditional test method, the instrument does not need to deal with the first side, so there is no danger of the test, no need to do it, no need to do it. Marying security measures and waiting lengthy scheduling commands can measure the data of the capacitor current only need to be connected to the opening triangle end of the PT. Since the weak frequency test signal is injected from the PT opening triangle, it will not have any impact on the protection of relay protection and PT itself, but also avoid the 50Hz industrial frequency interference signal. At the same time Due to the AC voltage of 100V, if there is a single -phase ground failure during measurement, the PT and Tester will not be damaged.