Frequency modulation series parallel resonance test device

NegotiableUpdate on 05/12

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Overview

The SHXZ-405kvA/200kv frequency modulation series parallel resonance test device is widely used in industries such as power, metallurgy, petroleum, and chemical engineering, and is suitable for the handover and preventive testing of high-capacity and high-voltage capacitive specimens.

Product Details

Details introduction:

SHXZ—405kvA/200kvFrequency modulation series parallel resonance test deviceTechnical Solution

1. Basic principle of series parallel resonance:
1.1 Resonant voltage withstand test is a new method of high-voltage testing that uses the inductance of a reactor and the capacitance of the test object to form an LC series circuit, adjusts the voltage frequency output of the variable frequency power supply, achieves series parallel resonance, and obtains high voltage on the test object. It has been widely used both domestically and internationally and has received high praise from experts.

2. Characteristics of series parallel resonance test device:
2.1 The series parallel resonance test device has a large output capacity, high output voltage, and can freely combine reactors for AC withstand voltage testing of different test samples.
The series parallel resonance test device has the advantages of small size, light weight, with each piece weighing no more than 50kg, and is particularly convenient for field testing.
The series parallel resonance test device has good protection functions, including overvoltage protection, overcurrent protection, time protection, flashover protection, overheating protection, module protection, etc.
The 2.4 series parallel resonance test device is easy to operate and has two modes: manual and automatic.
The 2.5 series parallel resonance test device adopts a large screen, which makes the test data clear at a glance and can print the test results.
The series parallel resonance test device has no risk of overvoltage after the test sample is broken down, and the damage to the test sample is relatively small.
The power supply capacity required for the 2.7 series parallel resonance test device is small, only a fraction of the power supply capacity required for the power frequency transformer test, solving the problem of difficulty in finding on-site power supply.

3. Environmental conditions for use:
3.1 Surrounding air temperature:
*High temperature:+45 ℃ * Low temperature: -10 ℃;
*Large daily temperature difference: 35k Sunshine intensity: 0.1w/cm2
3.2 Altitude: ≤ 2000m;
3.3 Relative humidity: ≤ 90%
3.4 The installation and placement location should be flat, and the inclination of the reactor installation should not be less than 5 degrees0 ；
There should be no gas vapor, chemical deposition dust, dirt, or other explosive media that seriously affect the insulation of the equipment around 3.5.

4. Scope of application:
4.1 Satisfy 300mm2/110KV cable, AC withstand voltage test with a length of 400m.

5Specific equipment configuration
5.1 Test requirements:
5．1．1．300mm2/AC withstand voltage test of 110kV cable, test time of 60min, test voltage of 52kV, test frequency of 30-300Hz, equivalent capacitance of 0.209 × 3=0.627uF.
5.2 Design of Reactor:
5．2．1. 300mm2/AC withstand voltage test of 110kV cable, test time of 60min, test voltage of 52kV, test frequency of 30-300Hz, equivalent capacitance of 0.627uF. When the frequency is 40Hz.
Test current I=ω CXUtry=2×3.14×40×0.627×52×10-3=8.2A
Corresponding inductance of reactor L=1/ω2C =25H

5.3 Configuration of Reactor:
5．3．1．300mm2/The AC withstand voltage test of 110kV cable has a high test voltage of 52kV. For ease of use, the reactor is divided into six sections, with each section having a voltage of 30KV, a current of 3.5A, and an inductance of 40H.
verification：
1) 300mm2/The AC withstand voltage test of 110kV cable is conducted for 60 minutes, with a test voltage of 52kV, a test frequency of 30-300Hz, and an equivalent capacitance of 0.627uF. Six reactors are used in two series and three parallel, with a rated inductance of 26.6H, a rated voltage of 60KV, and a rated current of 10.5A.

Test frequency: f=1/2 π√ LC=38.9Hz
Test current I=ω CXUtry=2×3.14×38.9×0.627×52×10-3=8A

5.4 Configuration of Excitation Transformer
5.4.1. Since the quality factor Q value is not less than 25 at rated load, the excitation transformer has a total reactor capacity of 105 × 6=630kVA, divided by the quality factor of 25 to obtain 25.2KvA, which is taken as 30KVA.
5.4.2. The specifications of the excitation transformer configured are 30kVA/2.5kV/5kV.

5.5 Configuration of FM power supply:
5.5.1. The capacity of the frequency modulation power supply is equal to or greater than the capacity of the excitation transformer, which is 30kVA.
5.5.2. The specification of the configured frequency modulation power supply is 30kVA.

5.6 Configuration of Capacitive Voltage Divider
5.6.1. Due to the AC withstand voltage test voltage of the 110kV cable being 52kV, the voltage of the capacitive voltage divider is 60kV and the capacitance is 1000PF.
5.6.2. Configure one capacitor voltage divider with a specification of 60kv/0.001uF.

5．7Compensation capacitor configuration：

5.7.1. Due to the high test voltage of 52kV, the compensation capacitor voltage is 60kV, and the configured compensation capacitor is 60kV/0.0125uF.