I.Overview
The device is mainly designed and manufactured for AC voltage test of 110kV power system. The reactor has many separate designs, which can meet the requirements of test conditions of high voltage and small current. It is the good ideal withstand equipment for the high voltage test department,the power installation and repair engineering units. The device is mainly composed of variable frequency control power supply, excitation transformer, high voltage reactor and capacitive voltage divider.
This device is a fourth generation AC voltage withstand resonance test device upgraded by our company's experience and market feedback. The fourth generation resonance AC voltage withstand test device interface is with 32 bit RISC CPU and simplified LINX kernel, 7 inch touch screen color graphics format, test resonant frequency curve, boost curve, curve display timing, real RMS of high voltage current, high voltage,low voltage, it has the function of protection, low voltage current, high voltage, flashover voltage protection function is more sensitive, the most advantage is not affected by the input power limits of 220V and 380V are used as the working power supply equipment.
II. Applicant:
The test set is suitable for testing 110kV power system, transformer, insulator,
wall busbar, GIS AC withstand voltage.
Maximum capacity ≤0.03μF
Test requency 45-65Hz
Maximum test voltage:300kV.
III.Schematic diagram
IV.Device’s capacity determination
110kV power system, transformer, insulator,wall busbar, GIS AC withstand voltage.
Max capacitance ≤ 0.0318μF,
test frequency 45-65Hz, test voltage 300kV.
The frequency. Selecting 50Hz
Current(I)=2πfCU试=2π×50×0.0318×10-6×300×103=2.99A
Inductance(L)=1/ω2C=338H
According to the items mentioned above, the inductance can be designed as 10 pieces of Reactor, which can be combined in series or in parallel to complete the test requirements, then single reactor should be 90kVA/30kV/3A/33H
Verification:
1) 110kV power system, transformer, insulator,wall busbar, GIS AC withstand voltage,max capacity 0.0318μF, test frequency is 45-65Hz, test voltage 300kV.
2) 10 reactors in series,then the inductance is (33*10) =330H
3)Test frequencyf=1/2π√LC=1/(2×3.14×√330×0.0318×10-6) = 49.2Hz
4)Test current I=2πfCU试=2π×50×0.0318×10-6×300×103 = 2.95A
Summary: the device’s capacity is confirmed as 900kVA/300kV; 10 reactors in series, and each reactor 90kVA/30kV/3A/33H, which can meet the test requirements.
V. Technical parameter of full syestem
1. Rated test voltage:300KV;
2. Rated capacitance: 900KVA;
3. Rated current: 3A;
4. Output voltage waveform distortion rate: ≤ 1.0%
5. Continuous working allowed: 60mins under rated load;
6. Quality factor: Q > 30(f=45Hz);
7.Input voltage(Power supply): 220V single phase and 380V three phase,50Hz;
8. Frequency range: 45Hz ~65Hz;
9. System measuring precision: 1.0%
10.Temperature rising: ≤65K after 60 mins continuous working under rated load;
11.Over-current, over-voltage protection,zero startup, winding protection function.
VI. Working environment
1. Ambient temperature: - 45ºC ~15ºC
2. Relative humidity: ≤90%RH
3.Altitude: ≤2500M
VII. Standards to be followed
1.GB501502006 "electrical device standard for hand over test of electric equipment installation engineering"
2.DL/T474.4-2006 "guide for implementation of field insulation test - AC withstand voltage test"
3.DL/T596-1996 "regulation of preventive test for electric power equipment"
4.GB/T16927.1-2-1997 "high voltage test technology"
5.DL/T1015 "guidelines for the use of on-the-spot DC and AC voltage test voltage measurement systems"
6.GB/T311.1-1997 "insulation and coordination of high voltage transmission and transformation equipment"
7.GB10229-1988 "reactor"
8.GB1094.3-2003 "power transformer"
9.GB191-2000 "package storage and transportation graphic sign"
10.JB/T9641-1999 "test transformer"
11.IEC 358 (1990) "coupling capacitor and capacitance divider"
12.GB4793-1984 "safety requirements for electronic measuring instruments"
13.GB/T3859.2-1993 "guidelines for application of semiconductor converters"
14.GB/T2423.8-1995 "basic environmental test rules for electrical and electronic products"
15.DL/T849.6-2004 "general technical conditions for special test instruments for electric power equipment,the sixth part: high voltage resonance test device.
VIII. System Configuration and technical datas
1.Configuration
|
Sr no
|
Name
|
Specification
|
Qty
|
|
1
|
Control unit
(Variable frequency power supply)
|
45kW/0.2kV0.38kV
|
1 unit
|
|
2
|
Excitation Transformer
|
45kVA/5kV/10kV/15kV/
0.2kV/0.4kV
|
1 unit
|
|
3
|
Reactor
|
90kVA/30kV
|
10 units
|
|
4
|
Divider
|
300kV/750pF
|
1 unit
|
|
5
|
Testing cable
|
|
1 set
|
|
6
|
Insulation Support
|
|
1 set
|
2.Connection method
|
combination
Test object
|
Reactor
90kVA/30kV, 10 units
|
Excitation transformer’s output
|
|
110 kV GIS, Switchboard, busbar..
|
10 units in series
|
15 kV
|
3. Control unit-Variable frequency power supply (1 unit):
1) Power rating: 45kW ;
2) Input voltage: 220V±10% single phase and 380V±10% 3-phase 50Hz
3) Output voltage: 0 ~ 400V adjustable,single phase,30-300Hz;
4) Output voltage frequency: 30 ~ 300Hz
5) Rated input current:118.4A;
6) Rated output current: 112.5A;
7) Waveform: Sine wave;
8) Resolution: 0.01KV;
9) Voltage measurement accuracy:0.5%;
10) Frequency adjustment:0.1Hz;
11) Frequency stabilization: 0.1%l
12) Working time: 60mins continous;
13) Noise: ≤50dB;
14) Size: 550mm*500mm*600mm;
15) Weight: 50kgs
16) advantage:
- The interior is controlled by the embedded touch screen, the operation function is optimized and the operation is simple.
- Automatically sweep frequency, find resonance point. Frequency range 20-300Hz, it can manually set sweep range, max sweep frequency time 3 minutes (full frequency sweep). Frequency resolution 0.1Hz
automatically completes the test process according to the set program.
- Automatic test, users can set test program. The system automatically
completes test process according to the setting program.
-Under automatic test, automatic tracking the resonant state. When the resonance state changes and exceeds the setted area, the system automatically tracks the resonance point. During the whole process, the system is guaranteed to work in the optimal output state, and the frequency voltage curve is drawn when frequency modulation is applied.
- Automatically follows voltage, the voltage is automatically adjusted to the target voltage when the voltage fluctuates normally, and the user can operate according to the test condition.
- Full voltage output protection: in the process of voltage regulation, it is strictly guaranteed that the frequency conversion power does not output full voltage.
- The software measured through strict simulation testing, it is safe, stable and reliable.
- Automatically save test data, data query function, query the previous test data according to the query conditions.
- LCD display voltage and current of the power supply; the frequency, voltage and current of the high voltage output.
- Protection function: power failure, overcurrent, overvoltage and flashover protection;
A) Overvoltage protection: the overvoltage protection value can be set artificially; when the output voltage of the whole set reaches the protection setting value, the whole set of device is automatically removed.
B) Overcurrent protection: the overcurrent protection value can be set artificially; when the output current of the whole set reaches the protection setting value, the whole set of device is automatically removed.
C) Breakdown protection: it has the function of discharge or flashover protection, and the whole set of device is automatically removed when the high voltage side occurs to the ground flashover. No damage to the test equipment and the body, the electronic components in the inverter power supply will not be penetrated
D) Power off protection: the device can be protected quickly after the power
failure.
- The internal structure of the frequency conversion power supply and its components are not changed after the normal highway and railway transportation, and the fasteners are not loose.
- The appearance and operation interface fully adopt humanized design, beautiful and easy to operate.
4. Excitation Transformer ( 1 unit ) :
1) Rated capacitance: 45kVA
2) Input voltage: 400V single phase,30-300Hz;
3) Output voltage: 5kV/10kV/15kV
4) Style: Oil-Immersed.
5) Weight:200kgs
5. Reactors ( 10 units ) :
1) Rated capacitance: 90KVA;
2) Rated voltage: 30kV;
3) Rated current: 3A;
4) Rated inductance: 33H each
5) Quality factor: ≥50 (f=45Hz);
6) Continuous working time: 60min
7) Temperature rises: < 60˚C
8) Working frequency: 30 ~ 300Hz
9) Dry type
10) Weight: 80kgs
6. Capacitive Divider
1) Capacitance: 750pF;
2) Output voltage: 300KV;
3) tgσ≤0.15%;
4) Working frequency: 30 ~ 300Hz;
5) Uncertainty: 1.0%
6) Divider Ratio:1000:1;
7) Accuracy: 1.0;
8) Weight: 15kgs
7.Others
|
Sr no
|
Description
|
Qty
|
|
1
|
Factory’s calibration report
|
1
|
|
2
|
Operating manual
|
1
|
0.1Hz VLF AC/DC Hipot tester
