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AJBX electrical equipment AC withstand voltage resonance test device
Product description
Parameters
The variable frequency series resonance withstand voltage test device is mainly aimed at the AC withstand voltage test of cross-linked cables, hydroelectric generators, main transformers, bus bars, GIS, etc. It has a wide range of applications and is used by local, city and county-level high-voltage test departments and power installations. , The ideal pressure equipment for repair and test engineering units.
The frequency conversion series resonance withstand voltage test device is mainly composed of frequency conversion control power supply, excitation transformer, reactor, capacitive voltage divider, and compensation capacitor （optional）.
The advantages of the frequency conversion series resonance withstand voltage test device in the power system:
1. The required power capacity is greatly reduced. The series resonant power supply uses the resonance of the resonant reactor and the capacitor to be tested to generate high voltage and large current. In the entire system, the power supply only needs to provide the part of the active power consumption in the system. Therefore, the power required for the test is only the test capacity. 1/Q.
2. The weight and volume of the equipment are greatly reduced. In the series resonant power supply, not only cumbersome high-power voltage regulators and ordinary high-power power frequency test transformers are omitted, and the resonant excitation power supply only needs 1/Q of the test capacity, which greatly reduces the weight and volume of the system, generally 1/10-1/30 of ordinary test equipment.
3. Improve the output voltage waveform. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the false breakdown of the test product by the harmonic peak.
4. Prevent large short-circuit current from burning the fault point. In the series resonance state, when the insulation weakness of the test product is broken down, the circuit is immediately detuned, and the loop current quickly drops to 1/Q of the normal test current. When the parallel resonance or test transformer is used for the withstand voltage test, the breakdown current immediately increases several dozen times. Compared with the two, the short-circuit current and the breakdown current are hundreds of times different. Therefore, series resonance can effectively find the insulation weakness, and there is no hidden danger of large short-circuit current burning the fault point.
5. There will be no recovery overvoltage. When the test product breaks down, due to the loss of resonance conditions, the high voltage disappears immediately, the arc is extinguished immediately, and the reestablishment process of the recovery voltage is very long. It is easy to disconnect the power before reaching the flashover voltage again. This voltage recovery The process is an intermittent oscillation process of energy accumulation. The process is long and there is no recovery overvoltage.
The main functions and technical characteristics of the frequency conversion series resonance withstand voltage test device:
1. The device has protection functions such as overvoltage, overcurrent, zero start, system detuning （flashover）, etc. The overvoltage and overcurrent protection value can be set according to user needs. Product.
2. The weight of the whole device is very light and it is easy to use on site.
3. The device has three working modes, which are convenient for users to choose flexibly according to the on-site situation and improve the test speed.
The working modes are: automatic mode, manual mode, automatic tuning manual boost mode.
4. Data can be stored and printed in different places. The stored data number is a number, which is convenient for users to identify and find.
5. When the device automatically sweeps the frequency, the starting point of the frequency can be set arbitrarily within the specified range. At the same time, the large LCD screen displays the sweep curve, which is convenient for the user to intuitively understand whether the resonance point is found.
6. ??The DSP platform technology is adopted, which can easily increase or decrease functions and upgrades according to user needs, and also makes the man-machine exchange interface more user-friendly.
Main components of the device
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Serial number
|
Device name
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Specification model
|
Unit
|
Quantity
|
|
1
|
Variable frequency power supply
|
AJBX-7.5kW
|
Station
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1
|
|
2
|
Excitation transformer
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JLB-7.5kVA/1.5/3/6kV/0.4kV
|
Station
|
1
|
|
3
|
High voltage reactor
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DK-33.75kVA/27kV
|
Station
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4
|
|
4
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Capacitor voltage divider
|
FC-1000pF/110kV
|
Set
|
1
|
AC withstand voltage test of power cable
Use AC voltage with a frequency range of 20Hz-300Hz to carry out withstand voltage test on the cable line. The test voltage and withstand time are in accordance with Table 1.
Table 1 Voltage and time of AC withstand voltage test for rubber and plastic cable lines
|
Rated voltage U0/U(kV)
|
Test voltage
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Time (min)
|
|
18/30 and below
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2.5U0(z or 2U0)
|
5(or 60)
|
|
21/35-64/110
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2U0
|
60
|
|
127/220
|
1.7U0 (or 1.4U0)
|
60
|
|
190/330
|
1.7U0 (or 1.3U0)
|
60
|
|
290/550
|
1.7U0 (or 1.1U0)
|
60
|
Note: Table 1 is taken from "Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard" GB 50150-2006P41
In addition to the above national standards, many domestic places or enterprises have also issued local test standards or enterprise standards accordingly. The test voltage of medium and low voltage cables is 1.6-2.0 times the phase voltage, and the test voltages of high-voltage cables are generally 1.4-1.7 times. The phase voltage varies slightly according to local standards. For example, Table 2 is the corporate standard of State Grid Corporation:
Table 2 AC withstand voltage test voltage and time of XLPE cable line
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Rated voltage U0/U(kV)
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Test voltage
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Time (min)
|
|
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Newly commissioned lines or non-newly commissioned lines not more than 3 years old
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Non-newly put into operation line
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||
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Below 18/30
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2.5 U0(2U0)
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2U0
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5(60)
|
|
21/35-64/110
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2U0
|
1.6U0
|
60
|
|
127/220
|
1.7U0
|
1.36U0
|
|
|
190/330
|
|||
|
290/550
|
|||
Note: Table 2 is taken from the State Grid Corporation "Power Cable Line Test Regulations" Q/GDW 11316-2014 P5
7.2 Transformer AC withstand voltage test
7.2.1 Handover test standard
Table 3 Reference Table for AC Test Voltage of Power Transformer
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System nominal voltage kV |
Maximum equipment voltage kV |
AC withstand voltage kV
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|
|
Oil-immersed power transformer
|
Dry-type power transformer
|
||
|
<1
|
≤1.1
|
——
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2
|
|
3
|
3.6
|
14
|
8
|
|
6
|
7.2
|
20
|
16
|
|
10
|
12
|
28
|
28
|
|
15
|
17.5
|
36
|
30
|
|
20
|
24
|
44
|
40
|
|
35
|
40.5
|
68
|
56
|
|
66
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72.5
|
112
|
——
|
|
110
|
126
|
160
|
——
|
Table 4 Voltage value of AC withstand voltage test at neutral point of power transformer with rated voltage 110(66)kV and above (kV)
ｖ
|
66
|
——
|
——
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——
|
——
|
|
110
|
126
|
Not directly grounded
|
95
|
76
|
|
220
|
252
|
Directly grounded
|
85
|
68
|
|
Not directly grounded
|
200
|
160
|
||
|
330
|
363
|
Directly grounded
|
85
|
68
|
|
Not directly grounded
|
230
|
184
|
||
|
500
|
550
|
Directly grounded
|
85
|
68
|
|
Ground through a small resistance
|
140
|
112
|
||
|
750
|
800
|
Directly grounded
|
150
|
120
|
Note: Table 3 and Table 4 are taken from "Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard"GB 50150-2016 P78
7.2.2 Preventive test standards
Table 5 AC test voltage value of power transformer
|
Rated Voltage kV |
Maximum working voltage kV
|
Line end AC test voltage value kV
|
Neutral AC test voltage value kV
|
||
|
Replace all windings
|
When partially replacing the winding or handover
|
Replace all windings
|
When partially replacing the winding or handover
|
||
|
<1
|
≤1
|
3
|
2.5
|
3
|
2.5
|
|
3
|
3.5
|
18
|
15
|
18
|
15
|
|
6
|
6.9
|
25
|
21
|
25
|
21
|
|
10
|
11.5
|
35
|
30
|
35
|
30
|
|
15
|
17.5
|
45
|
38
|
45
|
38
|
|
20
|
23.0
|
55
|
47
|
55
|
47
|
|
35
|
40.5
|
85
|
72
|
85
|
72
|
|
66
|
72.5
|
140
|
120
|
140
|
120
|
|
110
|
126.0
|
200
|
170（195）
|
95
|
80
|
|
220
|
252.0
|
360
|
306
|
85
|
72
|
|
395
|
336
|
（200）
|
（170）
|
||
|
330
|
363.0
|
460
|
391
|
85
|
72
|
|
510
|
434
|
230
|
195
|
||
|
500
|
550.0
|
630
|
536
|
85
|
72
|
|
680
|
578
|
140
|
120
|
||
Note: Table 5 is taken from "Preventive Test Process of Power Equipment" DL/T 596-1996P38
7.3Alternator AC withstand voltage test
7.3.1 Handover test standard
Table 6 AC withstand voltage test voltage of stator winding
|
Capacity (kW)
|
Rated voltage (V)
|
Test voltage (V)
|
|
Below 10000
|
36 or more
|
(1000+2Un)*0.8, the minimum is 1200
|
|
10000 and above
|
Below 24000
|
(1000+2Un)*0.8
|
|
10000 and above
|
24000 and above
|
Negotiate with the manufacturer
|
Note: Table 6 is taken from “Electrical Equipment Handover Test Standard for Electrical Installation Engineering” GB 50150-2016 P10
7.3.2 Preventive test standards
Table 7 AC withstand voltage test of stator winding
| Stator winding AC withstand voltage test | 1) Before overhaul 2) After replacing the winding | 1) The test voltage after all the stator windings are replaced and repaired is as follows: |
1) It should be carried out in the hot state before cleaning the dirt after shutdown. When in standby state, it can be carried out in cold state. The test conditions of the hydrogen-cooled generator are the same as the description of No. 3 in this table 1) 2) The water internal cooling motor should generally be tested under the condition of running water. The imported unit shall be in accordance with the manufacturer's regulations, and the water quality requirements shall be the same as that of the serial number 3 of this table. 5) 3) When possible, ultra-low frequency (0.1Hz) withstand voltage can be used, and the peak test voltage is 1.2 times the peak power frequency test voltage 4) Please refer to the relevant information for the test voltage during the process of completely or partially replacing the stator windings. |
||
|
Capacity kW or kVA |
Rated voltage Un V | Test voltage V | |||
| Less than 10000 | 36 or more |
2Un +1000 but the minimum is 1500 |
|||
| 10000 and above | Below 6000 | 2.5Un | |||
| 6000～18000 | 2Un +3000 | ||||
| Above 18000 | According to special agreement | ||||
| 2) The test voltage before overhaul or partial replacement of the stator winding and after repair is: | |||||
| Operating for 20 years and below | 1.5Un | ||||
| Direct connection to overhead lines in operation for more than 20 years | 1.5Un | ||||
| Those who have not been directly connected to overhead lines after operating for more than 20 years | (1.3～1.5)Un | ||||
Note: Table 7 is taken from "Preventive Test Process of Power Equipment" DL/T 596-1996 P10
According to the requirements of the tested products on site, such as: cable length, cross-sectional area, different voltage levels, for the requirements of cables, main transformers, switch cabinets, generators, etc., we specialize in making professional solutions for specific tested products. Custom-made various resonant devices.
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