●Product introduction
Product name: Oil-immersed frequency conversion series resonance
Product specifications: XSN (XZ) -2250kVA/750kV (oil type)
Applicable test products: GIS, switches, transformers, cables
Test product range: 500kV and below voltage level GIS, switch and other substation equipment, 110kV/300mm2 cable 2km
Product role and function: 1. Help customers to achieve preventive AC withstand voltage test and handover AC withstand voltage test of various tested products;
2. Test cross-linked rubber-plastic power cables, power transformers, GIS, transformers, insulators, generators, switches and other test products insulation withstand various overvoltage capabilities and AC withstand voltage test for capacitive loads.
Product nicknames: series resonance withstand voltage test equipment, AC withstand voltage test equipment, resonant booster device for inspection, series resonance withstand voltage tester.
Test object:
110kV/300mm2 cable 2km AC withstand voltage test, capacitance ≤0.292uF, test frequency 30-300Hz, test voltage 128kV, test time 60min.
AC withstand voltage test for GIS, switches and other substation equipment with voltage levels of 500kV and below, the test frequency is 30-300Hz, the test voltage does not exceed 740kV, and the test time is 1min.
●Technical parameters
1. Product core parameters:
Rated capacity: 2250kVA;
Input power: three-phase 380V voltage, frequency 50Hz;
Rated voltage: 250kV; 750kV;
Rated current: 9A; 3A;
Working frequency: 30-300Hz;
Device output waveform: sine wave
Waveform distortion rate: output voltage waveform distortion rate ≤ 1%;
Working time: allow continuous 60min under rated load; overvoltage 1.1 times 1 minute;
Temperature rise: the temperature rise after 60 minutes of continuous operation under rated load is ≤65K;
Quality factor: the device itself Q≥30 (f=45Hz);
Protection function: overcurrent, overvoltage and flashover protection for the tested product (see the frequency conversion power supply section for details);
Measurement accuracy: system effective value 1.5;
2. Excitation transformer JLB-120kVA/5/10/40kV/0.4kV 1 unit
Rated capacity: 120kVA;
Input voltage: 0-400V, single phase;
Output voltage: 5/10/40kV
Structure: oil type;
Weight: about 450kg;
3. Inverter power supply BP-120kW/380V 1 unit
Rated output capacity: 120kW
Working power supply: 380±10%V (three-phase), power frequency
Output voltage: 0 -400V, single phase,
Rated input current: 300A
Rated output current: 300A
Voltage resolution: 0.01kV
Voltage measurement accuracy: 1.5%
Frequency adjustment range: 30 – 300Hz
Frequency adjustment resolution: ≤0.1Hz
Frequency stability: 0.1%
Running time: continuous 60min under rated capacity
The maximum temperature of the components during continuous operation for 60min under the rated capacity is ≤65K;
Noise level: ≤50dB
4. High-voltage reactor DK (G)-750kVA/250kV Section 3
Rated capacity: 750kVA;
Rated voltage: 250kV;
Rated current: 3A;
Inductance: 215H/single section;
Quality factor: Q≥30 (f=45Hz);
Structure: oil type;
Weight: about 500kg;
5. Capacitor voltage divider FY-750kV/800pF 1 set
Rated voltage: 750kV;
High voltage capacity: 800pF
Dielectric loss: tgσ≤0.5%;
Partial pressure ratio: 10000:1
Measurement accuracy: effective value 1.5;
Weight: about 50kg;
