I. Test object and test requirements
AC withstand voltage test for GIS, with a test frequency of 30-300Hz, capacitance ≤ 0.03uF, test voltage ≤ 800kV, and test time of 1min.
II. Work environment
1. Environmental temperature: -100C-500C;
2. Relative humidity: ≤ 90% RH;
3. Altitude: ≤ 1000 meters;
III. Main technical parameters and functions of the device
1. Nameplate capacity: 6000kVA;
2. Input power supply: three-phase 380V voltage, with a frequency of 50Hz;
3. Rated voltage: 800kV;
4. Rated current: 7.5A;
5. Working frequency: 30-300Hz;
4. Device output waveform: sine wave;
5. Waveform distortion rate: Output voltage waveform distortion rate ≤ 1%;
6. Working time: Allow continuous 60 minutes under rated load; 1.1 times overvoltage for 1 minute;
7. Temperature rise: After continuous operation for 60 minutes under rated load, the temperature rise is ≤ 65K;
8. Quality factor: The device itself Q ≥ 30 (f=45Hz);
9. Protection function: It has overcurrent, overvoltage, and sample flashover protection for the tested object (see the variable frequency power supply section for details);
10. Measurement accuracy: System RMS 1.5 level;
IV. Equipment complies with standards
GB10229-88 Reactor
GB1094 Power Transformers
GB50150-2016 Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard
DL/T 596-1996 Preventive Testing Regulations for Electric Power Equipment
GB1094.1-GB1094.6-96 Degrees of Protection Provided by Enclosures
GB2900 Electrotechnical Terminology
GB/T16927.1~2-1997 High Voltage Test Techniques
V. Determination of device capacity If four reactors are designed, the single reactor will be
1500kVA/200kV/7.5A/53H, and the total capacity of the device will be 6000kVA.
1. AC withstand voltage test for GIS, with a test frequency of 30-300Hz, capacitance ≤ 0.03uF, test voltage ≤ 800kV, and test time of 1min. Using four reactors in series (coefficient 1.6), L=53*4*1.6=339.2H, then
Test frequency: f=1/2π√LC=1/(2×3.14×√339×0.03×10-6)=50Hz
Test current: I=2πfCU Test=2π×50×0.03×10-6×800×103=7.5A
The device capacity is set at 6000kVA/800kV; The reactor is divided into four sections, and a single section of the reactor is 1500kVA/200kV/7.5A/53H. Through combined use, it can meet the test requirements of the tested object mentioned above.
Test voltage ≤ 800kVGIS Using reactors in series with 4 sections Selection of excitation transformer output terminal 40kV.
VI. System configuration and its parameters
1. Driver transformer JLB-315kVA/10/20/40kV/0.4kV 1 set
a) Nameplate capacity: 315kVA;
b) Input voltage: 0-400V, single-phase;
c) Output voltage: 10/20/40kV
d) Structure: Oil type;
2. Variable frequency power supply BPY-200kW/380V 1 set
a) Rated output capacity: 315kW
b) Working power supply: 380±10%V (three-phase), power frequency
c) Output voltage: 0-400V, single-phase
d) Rated input current: 787.5A
e) Rated output current: 787.5A
f) Voltage resolution: 0.01kV
g) Voltage measurement accuracy: 1.5%
h) Frequency adjustment range: 30-300Hz
i) Frequency adjustment resolution: ≤ 0.1Hz
j) Frequency stability: 0.1%
k) Operation time: continuous 60min under Nameplate capacity
l) The maximum temperature of components under continuous operation for 60min under Nameplate capacity is ≤ 65K;
m) Noise level: ≤ 50dB
3. High voltage reactor DK-1500kVA/200kV 4 pcs
a) Nameplate capacity: 1500kVA;
b) Rated voltage: 200kV;
c) Rated current: 7.5A;
d) Inductance: 53H/single section;
e) Quality factor: Q ≥ 30 (f= 45Hz);
f) Structure: Oil type;
4. Capacitive voltage divider FRC-800kV/1000pF 1 set
a) Rated voltage: 800kV;
b) High voltage capacity: 1000pF
c) Dielectric loss: tg σ≤ 0.5%;
d) Partial pressure ratio: 9000:1
e) Measurement accuracy: effective value level 1.5;