ND500P Distribution Network Capacitive Current Tester-Wuhan Nanxing Electric Power Technology Co., Ltd.

Phone: 400-027-8938

Mobile: 133 9714 9829

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ND500P Distribution Network Capacitive Current Tester

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Cable and Overhead Line Inspection Series

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ND500P配网电容电流测试仪

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At present, China’s distribution network… of the net The neutral point is generally not directly grounded; when a single-phase-to-ground fault occurs on a transmission line, the current flowing through the fault point is, in fact, the capacitive current generated by the line’s capacitance to ground.

The power regulations stipulate that when 10kV and 35kV The system capacitive currents are respectively greater than 30A and 10A At that time, an arc-suppression coil should be installed to compensate for the capacitive current.

In order to verify whether this distribution system will experience PT Resonance and the nature of the resonance that occurs also require accurate measurement of the distribution network’s ground capacitance.

Traditional methods for measuring the capacitive current in distribution networks include the direct method using single-phase metallic grounding and the indirect method employing an external capacitor. However, these approaches require contact with primary equipment, which entails risks during testing, cumbersome procedures, and low operational efficiency.

Fully automatic capacitive current tester, From PT The heterofrequency test signal injected at the open-delta point is directly from PT The secondary side is used to measure the capacitive current in the distribution network. Compared with traditional testing methods, this instrument eliminates the need to interface with the primary side, thereby removing any associated testing hazards. It also obviates the need for cumbersome safety measures and lengthy waits for dispatch instructions; all that is required is to connect the measurement leads to... PT The data on the capacitive current can be measured at the open‑delta terminal.

This method Will not affect relay protection and PT It itself produces no impact and yet avoids it. 50Hz the power-frequency interference signal, while The output terminal of the tester can withstand 100V of the AC voltage; moreover, even if a single-phase-to-ground fault occurs in the system during measurement, it will not cause damage. PT and the testing instrument, so no special safety measures are required, This makes the task safe, simple, and fast, while ensuring that test results are accurate, stable, and reliable.

The tester features a large‑screen LCD with a Chinese menu, offering simple operation. Its compact size and lightweight design make it easy to carry for field work. Wiring is straightforward, testing is fast, and data accuracy is high, significantly reducing the workload of test personnel and boosting operational efficiency.

Technical indicators

1、 Measurement range

Total ground capacitance ≤120 microfarads (Three-phase to ground);

Capacitive current ≤ 1400A ( 66kV System)

Capacitive current ≤760 A ( 35kV System)

Capacitive current ≤ 220A ( 10kV System)

Capacitive current ≤130 A ( 6kV System)

2 , measurement accuracy

0.5μ F ～ 1 microfarads ± 10% ±5 characters

1 mu F ～ 90 mu F ±5%

90 mu F ～ 120 mu F±10 %

3 , Environmental conditions: Temperature - 10 ~ 50 °C ， Humidity ≤90%

4、 Power supply ： AC 220V ± 10% 50Hz ± 1%

5、 Appearance and weight ： 310 × 300 × 170mm 10 kilogram

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ND500P Distribution Network Capacitive Current Tester

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