I. Product Overview

The device is mainly designed and manufactured for 10kV, 35kV, 110kV, 220kV cables, 110kV / 80000 kVA main transformer fully insulated, 110kV, 220kV GIS, switches and circuit breakers. The reactor adopts only separate designs, which can not only meet the requirements of high voltage and small current equipment test conditions, but also meet the requirements of low voltage AC voltage test such as 10kV cable. It has a wide range of application, and is the ideal high voltage test equipment of ground, city and county levels and power installation and repair engineering units.

The device is mainly composed of frequency conversion control power supply, excitation transformer, electric reactor and capacitor voltage divider.

Advantages of series resonance application in electric power systems：

1. The required power supply capacity is greatly reduced. The series resonant power supply is using the resonant reactor and the test product capacitor resonance to generate high voltage and high current. In the whole system, the power supply only needs to provide the active power consumption part of the system. Therefore, so the power supply required for the test is only 1 / Q of the test capacity.

2. The weight and volume of the equipment are greatly reduced. In the series resonant power supply, not only saves the heavy high-power voltage regulating device and the ordinary high-power power frequency test transformer, but also, the resonant shock magnetic power supply only needs 1 / Q of the test capacity, which makes the system weight and volume greatly reduced, generally 1 / 10 of the ordinary test device.

3. Improve the waveform of the output voltage. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage, obtain a good sinusoidal waveform, and effectively prevent the misbreakdown of the harmonic peak on the test article.

4, prevent large short circuit current burn fault point. In the series resonance state, when the insulation weakness of the test article is broken down, the circuit is immediately deharmonic, and the circuit current quickly drops to 1 / Q of the normal test current. When the parallel resonance or test transformer does the voltage test, the breakdown current immediately rises tens of dozens of times. Compared with the two, the short circuit current and the breakdown current differ by hundreds of times. Therefore, the series resonance can effectively find the insulation weakness, and there is no large short circuit current burn fault point trouble.

5. There will be no recovery overvoltage. Test article breakdown, due to the loss of resonance conditions, high voltage also immediately disappear, the arc immediately out, and restore the voltage to establish the process is very long, it is easy to disconnect power before the flashover voltage, the voltage of the intermittent oscillation process is a kind of energy accumulation, the process is long, and there will not be any recovery over voltage.

Main functions and technical characteristics of FM resonance device：

1. The device has protection functions such as overvoltage, overcurrent, zero start, system detuning (flishover). The protection value of overvoltage and overcurrent can be adjusted according to user needs. When the test product is protected and the flashover voltage value can be recorded for test analysis.

2. The single weight of the whole device is very light and easy to use on site.

3. The device has three working modes, which are convenient for users to choose flexibly according to the site situation and improve the test speed. Working mode is: automatic mode, manual mode, automatic tuning manual boost mode.

4. Can store and print data in different places, and the deposited data number is digital, which is convenient to help users to identify and find。

5. The frequency starting point of the device can be set within the specified range, and the direction of the frequency can be selected up and down. At the same time, the LCD screen displays the scanning curve, so as for users to intuitively understand whether to find the resonance point.

6. The adopted DSP platform technology can easily increase or decrease functions and upgrade according to the needs of users, and also make the man-machine switching interface more humanized.

II. HZXB-1000 kVA / 500kV Variable Frequency Series Resonance Test Device

（1）HZXB-refers to the manufacturer code

1000 refers to the maximum rated capacity output in kVA

500 refers to the voltage level of the equipment in kV；

（2）HZXB-1000kVA/500kV

Technical index of frequency conversion series resonance test device

1、rated voltage

22kV- - -meets the AC voltage withstand test of 10kV cable; working frequency: 30-300Hz,

Test voltage is 22kV, and the test time is 5min;

52kV- - -meet the AC withstand test of 35kV cable; working frequency: 30-300Hz,

Test voltage is 52kV, and the test time is 60min;

128kV- - -meet the AC withstand test of 110kV cable; working frequency: 30-300Hz,

Test voltage is 128kV, and test time is 60min;

216kV- - -Meet the AC voltage withstand test of 220kV cable; working frequency: 30-300Hz,

Test voltage is 216kV, and test time is 60min;

300kV- - -AC withstand voltage test of 110kV GIS, switch and circuit breaker; working frequency: 30-300Hz, test voltage not exceeding 265kV, the test time is 1min;

500kV- - -the AC voltage withstand test of 220kV GIS, switch and circuit breaker; working frequency: 30-300Hz, the test voltage does not exceed 495kV, and the test time is 1min;

200kV- - -AC withstand test of 110kV / 80000 kVA main transformer; working frequency: 45-65Hz, test voltage not exceeding 160kV, test time 1min;

2. Output voltage waveform distortion rate: <1.0%

3. Allowed continuous working time: 60 minutes of working once under rated conditions;

4. Quality factor of the device: Q 30 (f=45Hz)

5, the device output waveform: sine wave

6, input power supply: three-phase 380V or single-phase 220V

7. Frequency adjustment range: 30Hz~300Hz

8. Accuracy of the system measurement is: 1.5%

9, the device has overvoltage, overcurrent, zero start and other protection functions

（3）The equipment follows standards     

《Electrical equipment handover test standard for electrical equipment installation engineering》    GB50150-2016

《High voltage resonance test device》                DL/T 849.6—2004  

《 Reactor 》                         GB10229.88

《Preventive test procedure for electric power equipment》          DL/T596-1996

《Coupling capacitors and capacitance dividers》          IEC358(1990)

（4）Description of the main configuration and technical parameters of the equipment

1. Frequency conversion power supply

2.Rated power: 37kW;

3.Input voltage: three-phase 380V or single-phase 220V ± 5% 50Hz

4.Output voltage: 0~400V is adjustable

5.Output voltage frequency: 30-300 Hz

6.The 0.1Hz step is adjustable

7.Frequency instability was 0.02%

8.Output current: 0~92.5A

High-voltage electric reactor (ten sets in total)

Rated working voltage: 50kV

Rated working current: 2A

Rated inductance amount: 95H

Continuous working time: 60min

Temperature rise: less than 65k

Operating frequency: 30~300Hz

9.Change the excitation voltage regulator                                     

Rated capacity: 37 kVA

Input voltage: 400V

Output voltage: 4 / 8 / 25kV

Output current: 9.25/4.62/1.48A

10.Capacitance voltage divider (one set)

   Self-electric capacity: 300 pF

Rated voltage: 500kV

   Self-electric capacity: 300 pF

Rated voltage: 500kV

11.Test line one set

III. Test With A Cable Table

Test test test with a cable table