54kV/108kVA Variable Frequency Series Resonance Device
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I. Test objects and test requirements 1. 35kV/300mm² cable, length within 2km, capacitance ≤0.39uF, test frequency 30-300Hz, test voltage 52kV.
2. AC withstand voltage test of 35kV/40000kVA power transformer, capacitance ≤0.015uF, test frequency 45-65Hz, test voltage ≤95kV.
II. Working environment 1. Ambient temperature: -15℃ to 45℃;
2. Relative humidity: ≤90%RH;
3. Altitude: ≤3000 meters;
III. Main technical parameters and functions of the device 1. Rated capacity: 270kVA;
2. Input power: three-phase 380V voltage, frequency 50Hz;
3. Rated voltage: 108kV; 54kV;
4. Rated current: 2.5A; 5A;
5. Working frequency: 30-300Hz;
6. Waveform distortion rate: output voltage waveform distortion rate ≤1%;
7. Working time: continuous 60min allowed under rated load; overvoltage 1.1 times for 1 minute;
8. Temperature rise: temperature rise ≤65K after continuous operation for 60min under rated load;
9. Quality factor: device's own Q≥30 (f=45Hz);
10. Protection functions: overcurrent, overvoltage and flashover protection for the test object (see variable frequency power supply section for details);
11. Measurement accuracy: system effective value class 1.5;
IV. Standards followed by the equipment GB10229-88 "Reactors"
GB1094 "Power Transformers"
GB50150-2006 "Standard for Hand-over Test of Electric Equipment Installation Engineering"
DL/T596-1996 "Preventive Test 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 35kV/300mm² cable, length 2000m, capacitance ≤0.39μF, test frequency 30-300Hz, test voltage 52kV.
Frequency taken as 30Hz
Design four reactors, using two reactors in series and two groups in parallel, then single reactor is 67.5kVA/27kV/2.5A/72H, total device capacity is 270kVA.
Verification: 1. AC withstand voltage test of 35kV/40000kVA power transformer, capacitance ≤0.015uF, test frequency 45-65Hz, test voltage ≤95kV.
Use four reactors in series, at this time inductance = 72×4=288H, with compensation capacitor 110/6000pF.
Conclusion: Device capacity is set as 270kVA/108kV/54kV, divided into four reactors, single reactor is
67.5kVA/27kV/2.5A/72H, and the test requirements of the above test objects can be met through combined use.
List of equipment usage relationships during test
| Equipment combination Test object |
Reactor 67.5kVA/27kV Four sections |
Excitation transformer Output terminal selection |
| 35kV/300mm² cable, length within 2km |
Use two reactors in series and two groups in parallel |
3kV |
| 35kV/40000 kVA power transformer |
Use four reactors in series |
5kV |
VI. System configuration and parameters
1.MSB-15kVA/1/3/5kV
a) Rated capacity: 15kVA;
b) Input voltage: 220V single-phase/380V three-phase;
c) Output voltage: 1kV; 3kV; 5kV
d) Structure: dry type;
e) Weight: about 35kg;
2.MSXB-15kW/220/380V variable frequency power supply
a) Rated output capacity: 15kW
b) Working power: 220 (single-phase)/380 (three-phase) ±10%V, power frequency
c) Output voltage: 0-200/400V, single phase,
d) Rated input current: 40A
e) Rated output current: 40A
f) Output waveform: sine wave
g) Voltage resolution: 0.01kV
h) Voltage measurement accuracy: 1.5%
i) Frequency adjustment range: 30-300Hz
j) Frequency adjustment resolution: ≤0.1Hz
k) Frequency stability: 0.1%
l) Running time: continuous 60min under rated capacity
m) Maximum component temperature ≤65K after continuous operation for 60min under rated capacity;
n) Noise level: ≤50dB
o) The following functions can be realized
1) Internally controlled by embedded touch screen, operation functions are optimized, simple operation
2) Automatic frequency sweep to find resonance point. Frequency range 30-300Hz, manual setting of sweep range possible, maximum sweep time 1.5 minutes (full frequency sweep). Frequency resolution 0.1Hz
3) Automatic test: user can set test program, system automatically completes test process according to set program
4) During automatic test, automatically track the resonance state of the system. When the resonance state changes and exceeds the set area, the system automatically tracks the resonance point. Throughout the process, ensure the system works in optimal output state, and draw frequency-voltage curve during frequency adjustment.
5) Automatically track voltage during withstand voltage test, automatically adjust voltage to target voltage when voltage fluctuates normally, operated by user according to test situation
6) Full voltage output protection: during voltage regulation process, strictly ensure that the variable frequency power supply will not output full voltage 7) Software has passed strict simulation operation tests, safe, stable and reliable operation
8) Automatically save test data, data query function, query previous test data according to query conditions;
9) LCD screen can display power supply voltage and current; frequency, voltage, current of high voltage output
10) Protection functions: with power-off, overcurrent, overvoltage and flashover protection functions;
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
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