SHXZ-300kVA/30kV Variable Frequency Series Resonant Voltage Withstand Test Device

SHXZ-300kVA/30kV transformerTechnical scheme for frequency series resonance withstand voltage test device

1. Scope of Equipment Application

1.1 Meet the requirement of 300mm2/10KV cable, AC withstand voltage test with a length of 5 kilometers.

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:
*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.
4Specific equipment configuration
4.1 Test requirements:
4．1．1．300mm2/AC voltage withstand test for 10kV cable with a length of 5 kilometers. The test time is 5 minutes, the test voltage is 22kv, the test frequency is 30-300Hz, and the equivalent capacitance is 0.418uF/km.
4.2 Design of Reactor:
4．2．1. 300mm2/AC withstand voltage test for 10kV cable with a length of 5 kilometers The test time is 5 minutes, the test voltage is 22kv, the test frequency is 30-300Hz, and the equivalent capacitance is 2.09uF. When the frequency is 35Hz.
Test current I=ω CXUtry=2×3.14×35×2.09×22×10-3=10.1A
Corresponding inductance of reactor L=1/ω2C =9.9H
4.3 Configuration of Reactor:
4．3．1．300mm2/AC withstand voltage test for 10kV cable with a length of 5 kilometers, with a high test voltage of 22kV. For ease of handling, the reactor is divided into five sections, each with a voltage of 30KV, a current of 2A, and an inductance of 50H.
verification：
1) 300mm2/AC withstand voltage test for 10kV cable with a length of 5 kilometers The test time is 5 minutes, the test voltage is 22kV, the test frequency is 30-300Hz, and the equivalent capacitance is 2.09uF. Five reactors are used in parallel with a rated inductance of 10H, a rated voltage of 30kV, and a rated current of 10A.
Test frequency: f=1/2 π√ LC=34.8Hz
Test current I=ω CXUtry=2×3.14×34.8×2.09×22×10-3=10A
4.4 Configuration of Excitation Transformer
4.4.1. As the quality factor Q value is not less than 20 at rated load, the excitation transformer has a total reactor capacity of 300kVA, which is divided by the quality factor of 20 to obtain 15kVA.
4.4.2. The specifications of the excitation transformer configured are YHXZB-15kVA/1.5kV/3kV.
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 15kVA.
4.5.2. The specification of the configured FM power supply is SHXZ-15kVA.
4.6 Configuration of capacitive voltage divider
4.6.1. Due to the high test voltage of 22kV, the voltage of the capacitive voltage divider is 30kV and the capacitance is 10000PF.
4.6.2. Configure one capacitor voltage divider with a specification of FRC-30kv/0.01uF.

5. Equipment Test Wiring Diagram