Overcurrent Protection 380V 400kVA Series Resonant Test System

Series resonance test device

1. Subject
1. 10kV/300mm2 cable 3km AC withstand voltage test, capacitance ≤1.1265uF, test frequency 30-300Hz, test voltage 22kV, test time 15 min.
2. AC withstand voltage test of 10kV/2500kVA main transformer, capacitance ≤0.01uF, test frequency 45-65Hz, test voltage not exceeding 28kV, test time 1min.
3. AC withstand voltage test of 10kV switch, busbar and other substation equipment, the test frequency is 30-300Hz, the test voltage does not exceed 42kV, and the test time is 1min.
4. 35kV/300mm2 cable 2km AC withstand voltage test, capacitance ≤0.361uF, test frequency 30-300Hz, test voltage 52kV, test time 60min.
5. AC withstand voltage test of 35kV/6300kVA main transformer, capacitance ≤0.01uF, test frequency 45-65Hz, test voltage 68kV, test time 1min.
6. AC withstand voltage test of 35kV switchgear, circuit breaker and other substation equipment, the test frequency is 30-300Hz, the test voltage does not exceed 95kV, and the test time is 1min.

7.220kV circuit breaker AC withstand voltage test, test frequency 30-300Hz, test voltage 368kV, test time 1min.

2. The main technical parameters and functions of the system
1. Rated capacity: 400kVA;
2. Rated voltage: 27kV; 50kV; 400kV;
3. Rated current: 2A;
4. Allow continuous working time: 60min under rated current;
5. The quality factor of the device itself: Q≥30 (when f=45Hz);
6. System measurement accuracy: effective value 1.0;
7. Input power: 50Hz; three-phase 380V
8. Working frequency of variable frequency power supply: 40-300Hz;
9. Frequency resolution: 0.1Hz;
10. Frequency instability: ≤0.1%;
11. It has overcurrent, overvoltage and flashover protection for the tested product;
12. Ambient temperature: -150C -40 0C, relative humidity: ≤90%RH, altitude ≤2000 meters.

3. Selection and determination of system parameters
Single section reactor is 54kVA/27kV/2A/50H, a total of four sections verification:
1) For a 10kV/300mm2/3km cable, the capacitance is 1.1265μF, the test voltage is 22KV, and four reactors are used in parallel. At this time, the inductance of the reactor is 12.5H, then:
Test frequency: f=1/2π√LC=42.41Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×42.41×1.1265×22×10-3=6.6A
2) 10kV/2500kVA main transformer AC withstand voltage test, the capacitance does not exceed 0.01μF, the test voltage is 28kV, the reactor is connected in series with two sections, the inductance is 113H, then:
Test frequency: f=1/2π√LC=149.72Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×149.72×0.01×28×10-3=0.26A

3) AC withstand voltage test of 10kV switch, busbar and other substation equipment, the test frequency is 30-300Hz, the capacitance does not exceed 0.015μF, the test voltage does not exceed 42kV, the reactor adopts two series connection, the inductance is 113H, then:
Test frequency: f=1/2π√LC=122.25Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×122.25×0.015×42×10-3=0.48A
4) For the 35kV/300mm2/2km cable, the capacitance is 0.361μF, the test voltage is 52KV, and two reactors are used in series and two parallel. At this time, the inductance of the reactor is 56.5H, then:
Test frequency: f=1/2π√LC=35.24Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×35.24×0.361×52×10-3=4.16A
5) 35kV/6300kVA main transformer AC withstand voltage test, the capacitance does not exceed 0.01μF, the test voltage is 68kV, the reactor is connected in series with four sections and the inductance is 240H, then:
Test frequency: f=1/2π√LC=83.88Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×83.88×0.01×68×10-3=0.54A
6) 35kV switch, circuit breaker, etc. AC withstand voltage test, the test voltage is 95kV, the reactor is connected in series with four sections and the inductance is 240H, then:
Test frequency: f=1/2π√LC=83.88Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×83.88×0.015×95×10-3=0.75A
7) AC withstand voltage test of 220kV switches, circuit breakers, etc., the capacitance does not exceed 5000pF, the test voltage is 368kV, the reactor is 50kVA/50kV/100H eight series in series, the inductance is 960H, then:
Test frequency: f=1/2π√LC=72.64Hz
Test current: I=ωCXU test=2πfCXU test=2×3.14×72.64×0.005×368×10-3=0.84A

Founded in 2003, FANKE is the domestic leader specializing in designing and manufacturing HV test, measurement and overhaul equipments. In 2003, Wuhan HIGHVOLT Co.,Ltd is established as our subsidiary. We provide a diversity of complete testing solutions and one-stop service for electric power companies, electric research institutions and electric equipments manufacture companies.
Located in Guannan Science and Technology Industrial park-- the Optical Valley of China, we cover an area of 12,000 square meters used for workshop and offices.With the registered capital of 16,000,000 yuan, our annual sales volume reaches 70,000,000 yuan. As a sub-measurement unit of Wuhan city, we develop us as a comprehensive high-tech enterprise integrating research, development, production, installation, commission, sales and service consultancy.

Good networking keeps us stay advantageous and innovative in the market. Relied on the wide cooperation with institutions of higher learning in Wuhan, we establish a HV research center supported by professional HV engineers and specialists from Wuhan High Voltage Research Institute of State Grid, Institute of Water Conservancy and Hydroelectric Power of Huazhong University of Science &Technology and Wuhan University.

Our management team is composed of professional administrators with rich experience in modern business and project management and technical personnel specializing in HV, power transmission, transformation and automation. Until now, we employ 75 stable workers, 65% of whom have bachelor degree and some of the rest are advanced engineers and professional experts with Doctor degree.

We hold numerous intellectual property rights, utility model and invention patents for products, such as hydraulic integrated high voltage withstand test system, series resonant test trail, ultra high voltage AC/DC voltage withstand test equipment, power frequency PD free voltage withstand test equipment and other electric power maintenance equipments as well as other tailor-made products.
Our products have been applied for onsite handover, preventive maintenance and quality inspection test. We have customers all around the country, including stated-owned institutions and large-scaled enterprises in sections of railway, oil industry and chemical engineering. Some products have been exported to overseas markets, including USA, Mid-east, Korea, India and Vietnam, ect.

With a vision to win-win result, We will continue to focus on customer needs and rely on technical innovation, striving to become the top-ranking provider for electric testing and measurement equipments and EPC engineering service.