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35kV cable, S=500mm2， 1km length variable frequency series resonant withstand voltage test device
35kV cable, S=500mm2， 1km length variable frequency series resonant withstand voltage test device
Product details
Technical Scheme for YHXZB-360kVA/100kv Frequency Modulation Series Parallel Resonance Test Device
1. Scope of Equipment Application
1.1 Meet the AC withstand voltage test of 500mm2/35KV cable with a length of 1 kilometer.
1.2 Meet the AC withstand voltage test of 500mm2/10KV cable with a length of 2 kilometers.
1.3 Meet the AC withstand voltage test requirements for 35kV busbars, voltage transformers, and insulators.
1.4 Meet the AC withstand voltage test of 50000KVA/35kV main transformer.
3.5 Meet the AC withstand voltage test for 80000KW/10.5KV high-voltage motors.
2. Equipment manufacturing reference and execution standards
DL/T849.6-2004 "High Voltage Resonance Test Device"
GB 6450-1986 Dry type Power Transformers
DL/T848.2-2004 "Test Transformers"
GB/10229-1988 "Reactors"
GB/T11920-1989 General Technical Conditions for Control Devices
GB/T16927.1-1997 "High Voltage Test Techniques"
IEC358-1990 "Coupling capacitors and capacitive voltage dividers"
GB311.1 Insulation Coordination for High Voltage Transmission and Transformation Equipment
DL/T846-2004 General Technical Conditions for High Voltage Testing Equipment
Q/CSG10007-2004 "Preventive Testing Regulations for Power Equipment"
GB7328-87 "Sound Level Measurement of Transformers and Reactors"
DL474。 4-1992 "AC Voltage Endurance Test"
3. Environmental conditions for use
3.1 Surrounding air temperature:
Maximum temperature:+45 ℃ Minimum temperature: -10 ℃;
Maximum 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 50 degrees;
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. Specific equipment configuration
4.1 Test requirements:
4.1.1.500mm2/35kV cable, AC withstand voltage test with a length of 1 kilometer, test time of 60 minutes, test voltage of 52kV, test frequency of 30-300Hz, equivalent capacitance of 0.232uF.
4.1.2.500mm2/10kv cable, AC withstand voltage test with a length of 2 kilometers, test time of 5 minutes, test voltage of 22kv, test frequency of 30-300Hz, equivalent capacitance of 0.438uF/km.
4.1.3.3 AC withstand voltage test for 5kV busbar, voltage transformer and insulation, with a test time of 1 minute, a maximum test voltage of 95kV, and a test frequency of 45Hz or above. The maximum equivalent capacitance is 0.015uF.
4.1.4.50000KVA/35kV main transformer AC withstand voltage test, test time 1 minute, test voltage 85kV, test frequency 45-65Hz, equivalent capacitance 0.0248uF.
4.1.5 AC withstand voltage test for 10000KW/10.5KV high-voltage motor, with a test time of 1 minute, a test voltage of 24kV, a test frequency of 45-65Hz, and an equivalent capacitance of 1.45uF.
4.2 Design of Reactor:
4．2．1. 500mm2/35kV cable, AC withstand voltage test with a length of 1 kilometer, test time of 60 minutes, test voltage of 52kV, test frequency of 30-300Hz, equivalent capacitance of 0.232uF. When the frequency is 35Hz.
Test current I=ω CXU test=2 × 3.14 × 35 × 0.232 × 52 × 10-3=2.7A
Corresponding inductance of reactor L=1/ω 2C=89H
4．2．2. 500mm2/10kv cable, AC withstand voltage test with a length of 1 kilometer, test time of 5 minutes, test voltage of 22kv, test frequency of 30-300Hz, equivalent capacitance of 0.876uF. When the frequency is 35Hz.
Test current I=ω CXU test=2 × 3.14 × 35 × 0.876 × 22 × 10-3=4.2A
Corresponding inductance of reactor L=1/ω 2C=23.6H
4．2．3. AC withstand voltage test for 35kV busbar, voltage transformer and insulation, with a test time of 1 minute, maximum test voltage of 95kV, and test frequency above 45Hz. The maximum equivalent capacitance is 0.015uF. When the frequency is 50Hz.
Test current I=ω CXU test=2 × 3.14 × 50 × 0.015 × 95 × 10-3=0.45A
Corresponding inductance of reactor L=1/ω 2C=676H
4．2．4. AC withstand voltage test of 50000KVA/35kV main transformer, test time of 1 minute, test voltage of 85kV, test frequency of 45-65Hz, equivalent capacitance of 0.0248uF. When the frequency is 50Hz.
Test current I=ω CXU test=2 × 3.14 × 50 × 0.0248 × 85 × 10-3=0.67A
Corresponding inductance of reactor L=1/ω 2C=408H
4．2．5. AC withstand voltage test of 80000KW/10.5KV high-voltage motor, test time 1 minute, test voltage 24kv, test frequency 45-65Hz, equivalent capacitance 1.45uF. When the frequency is 50Hz.
Test current I=ω CXU test=2 × 3.14 × 50 × 1.45 × 24 × 10-3=11A
Corresponding inductance of reactor L=1/ω 2C=7H
4.3 Configuration of Reactor:
4.3.1.35kV AC withstand voltage test for combination electrical appliances, busbars, voltage transformers, and insulators, with a test time of 1 minute and a maximum test voltage of 95kV. For ease of use, the reactor is divided into six sections, each with a voltage of 30KV, a current of 2A, and an inductance of 40H.
verification:
1) AC withstand voltage test of 500mm2/35kV cable, with a test time of 60 minutes, a test voltage of 52kV, a test frequency of 30-300Hz, and an equivalent capacitance of 0.232uF. Two series and two parallel reactors are used with a rated inductance of 40H, a rated voltage of 60KV, and a rated current of 4A.
Test frequency: f=1/2 π√ LC=52.3Hz
Test current I=ω CXU test=2 × 3.14 × 52.3 × 0.232 × 52 × 10-3=3.9A
2) AC withstand voltage test of 500mm2/10kv cable, with a test time of 5 minutes, a test voltage of 22kv, a test frequency of 30-300Hz, and an equivalent capacitance of 0.876uF. Four reactors are connected in parallel with a rated inductance of 10H, a rated voltage of 30KV, and a rated current of 8A.
Test frequency: f=1/2 π√ LC=53.8Hz
Test current I=ω CXU test=2 × 3.14 × 53.8 × 0.876 × 22 × 10-3=6.5A
3) AC withstand voltage test for 35kV main transformer, busbar, voltage transformer and insulation, with a test time of 1 minute, maximum test voltage of 95kV, and test frequency above 45Hz. The maximum equivalent capacitance is 0.015uF. Four reactors are connected in series with one 100KV/0.01uF compensating capacitor in parallel, with a rated inductance of 160H, a rated capacitance of 0.025uF, a rated voltage of 120KV, and a rated current of 2A.
Test frequency: f=1/2 π√ LC=79.6Hz
Test current I=ω CXU test=2 × 3.14 × 79.6 × 0.025 × 95 × 10-3=1.2A
4) AC withstand voltage test of 50000KVA/35kV main transformer, with a test time of 1 minute, a test voltage of 85kV, a test frequency of 45-65Hz, and an equivalent capacitance of 0.0248uF. Four reactors are used in series with one 100KV/0.01uF compensation capacitor in parallel, with a rated inductance of 160H, a rated capacitance of 0.0348uF, a rated voltage of 120KV, and a rated current of 2A.
Test frequency: f=1/2 π√ LC=67.5Hz
Test current I=ω CXU test=2 × 3.14 × 67.5 × 0.0348 × 85 × 10-3=1.25A
5) AC withstand voltage test for 80000KW/10.5KV high-voltage motor, with a test time of 1 minute, a test voltage of 24kV, a test frequency of 45-65Hz, and an equivalent capacitance of 1.45uF. Six reactors are used in parallel with a rated inductance of 6.7H, a rated voltage of 30KV, and a rated current of 12A.
Test frequency: f=1/2 π√ LC=51Hz
Test current I=ω CXU test=2 × 3.14 × 51 × 1.45 × 24 × 10-3=11A
4.4 Configuration of Excitation Transformer
4.4.1. Since the quality factor Q value is not less than 15 at rated load, the excitation transformer has a total reactor capacity of 360kvA, divided by the quality factor of 15 to obtain 24kvA and take 30kvA.
4.4.2. The specifications of the excitation transformer configured are 30kVA/3kV/6kV.
4.5 Configuration of FM power supply:
4.5.1. The capacity of the frequency modulation power supply is equal to or greater than the capacity of the excitation transformer, which is taken as 30kVA.
4.5.2. The specification of the configured frequency modulation power supply is 30kVA.
4.6 Configuration of capacitive voltage divider
4.6.1. Due to the AC withstand voltage test voltage of the 35kV combination device, voltage transformer, and insulation module being 95kV, the voltage of the capacitive voltage divider is 100kV and the capacitance is 1000PF.
4.6.2. Configure one capacitor voltage divider with a specification of 100kv/0.001uF.
4.7 Compensation capacitor configuration:
4.7.1. As the maximum test voltage is 95kV, the compensation capacitor voltage is 100kV, and the configured compensation capacitor is 100kV/0.01uF.
5．Characteristics of series parallel resonance test device:
5．Characteristics of series parallel resonance test device:
5.1 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.
5.2 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 series parallel resonance test device has extremely simple operation and has two modes: manual and automatic.
The 5.5 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 5.6 series parallel resonance test device has no risk of overvoltage after the test sample breaks down, and the damage to the test sample is relatively small.
The power supply capacity required for the 5.7 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 difficult to find power supply on site
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