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35kV cable, S=300mm2， 1.5km length variable frequency series resonant withstand voltage test device
35kV cable, S=300mm2， 1.5km length variable frequency series resonant withstand voltage test device
Product details
Technical Scheme for YHXZB-220kVA/100kV Variable Frequency Series Resonant Voltage Withstand Test Device
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 small size, light weight, 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 has extremely simple operation 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. Scope of application:
3．1Meet the AC withstand voltage test for a 300mm2/35kV cross-linked cable with a length of 1.5km.
3．2Meet the AC withstand voltage test for a 300mm2/10kv cross-linked cable with a length of 3km.
3．3Meet the AC withstand voltage test for high voltage electrical appliances such as switches and busbars with a voltage of 10kV and below.
4. Environmental conditions for use:
4.1 Environmental temperature: -10 ℃ to 40 ℃
4.2 Relative humidity: not exceeding 90%
4.3 Altitude: below 2500 meters
5. Determination of device capacity:
5.1 AC withstand voltage test for 300mm2/35KV cable with a length of 1.5km, capacitance of 0.19uF, test frequency of 30-300Hz, and test voltage of 52kV.
The frequency is set to 35Hz
Test current I=2 π fCU Test=2 π × 35 × 0.19 × 10-6 × 52 × 103=2.2A
Corresponding inductance of reactor L=1/ω 2C=108H
5.2 AC withstand voltage test for 300mm2/10KV cable, length 3km, capacitance 0.37 × 3, 1.11uF, test frequency 30-300Hz, test voltage 22kV.
The frequency is set to 35Hz
Test current I=2 π fCU Test=2 π × 35 × 1.11 × 10-6 × 22 × 103=5.4A
Corresponding inductance of reactor L=1/ω 2C=18.6H
5.3 AC withstand voltage test for high voltage electrical appliances such as 10KV and below switches and busbars, with a maximum capacitance of 0.05uF, a test frequency of 45-200Hz, and a maximum test voltage of 42kV.
The frequency is set at 45Hz
Test current I=2 π fCU Test=2 π × 45 × 0.05 × 10-6 × 42 × 103=0.6A
Corresponding inductance of reactor L=1/ω 2C=250H
※：Based on the test voltage, current, frequency, and inductance of the above items, four reactors are designed. Four reactors can be connected in series or parallel to complete the above test requirements and objectives. Therefore, a single reactor is 22kV/2.5A/40H
verification:1. 300mm2/35KV cable, AC withstand voltage test with a length of 1.5km, capacitance of 0.19uF, test frequency of 30-300Hz, test voltage of 52kV.
☆：When using three reactors in series, the rated inductance of the reactors is 120H, the rated voltage is 66KV, and the rated current is 2.5A.
Test frequency f=1/2 π√ LC=1/(2 × 3.14 × √ 120 × 0.19 × 10-6)=33.3Hz
Test current I=2 π fCU Test=2 π × 33.3 × 0.19 × 10-6 × 52 × 103=2.1A
verification:2. 300mm2/10KV cable, 3km long AC withstand voltage test, capacitance 1.11uF, test frequency 30-300Hz, test voltage 22kV.
☆：When using 4 reactors in parallel, the rated inductance of the reactors is 10H, the rated voltage is 22KV, and the rated current is 10A.
Test frequency f=1/2 π√ LC=1/(2 × 3.14 × √ 10 × 1.11 × 10-6)=47.8Hz
Test current I=2 π fCU Test=2 π × 47.8 × 1.11 × 10-6 × 22 × 103=7.3A
verification:3. AC withstand voltage test for high voltage electrical appliances such as 10KV and below switches and busbars, with a maximum capacitance of 0.05uF, a test frequency of 45-200Hz, and a maximum test voltage of 42kV.
☆：Using 4 reactors in series, the rated inductance of the reactors is 160H, the rated voltage is 88KV, and the rated current is 2.5A.
Test frequency f=1/2 π√ LC=1/(2 × 3.14 × √ 160 × 0.05 × 10-6)=56.3Hz
Test current I=2 π fCU Test=2 π × 56.3 × 0.05 × 10-6 × 22 × 103=0.74A
Summary:The device capacity is set as220kVA/100KVDivided into four sections of reactors, each section of the reactor is55kVA/30kV/2.5AThe combination of use can meet the experimental requirements of the above-mentioned test samples.
6. Use relationship list during the experiment
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