This standard specifies the technical requirements, test methods and inspection rules for AC silicon carbide valve-type arresters under normal use conditions. This standard applies to silicon carbide valve-type arresters that limit overvoltage and protect electrical equipment from overvoltage damage in AC power systems. GB 7327-1987 Silicon carbide valve arrester for AC systems GB7327-1987 Standard download and decompression password: www.bzxz.net

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National Standard of the People's Republic of China
Silicon carbide surge arresters for AC systems
Silicon carbide surge arresters for AC systems UDC621.316.933
GB7327-87
This standard specifies the technical requirements, test methods and inspection rules for AC silicon carbide valve-type arresters under normal use conditions. 1 General
1.1 Scope of application
This standard is applicable to AC power systems Silicon carbide valve-type arresters (hereinafter referred to as arresters) that limit overvoltage and protect electrical equipment from overvoltage damage.
1.2 Normal use conditions of arresters
Surge arresters that comply with this standard are suitable for indoor and outdoor operation in accordance with the following normal use conditions. a. The ambient temperature is not higher than +40℃ and not lower than -40℃ b. The altitude is not more than 1000m;
c.
The rated frequency of the power system is 50Hz
d .
The short-term power frequency voltage rise of the power system at the installation point of the arrester shall not exceed the rated voltage of the arrester. 1.3 Abnormal conditions of use of arresters
If the arrester is to operate under the following abnormal conditions, it should be agreed between the supplier and the buyer. a.
b.
c.
d.
e.
f.
g.
h .
i.
i.
K.
The ambient temperature exceeds +40℃ or below -40℃; the altitude exceeds 1000m;
Smoke or steam that may damage the insulation surface or installation equipment: Excessive contamination by smoke, salt spray or other conductive substances, charged flushing;
Pengshan tropical thunder areas:
Dust, gas, volatilization Explosive mixture of explosive gases; Abnormal shaking or mechanical vibration;
The short-term power frequency voltage increase of the system at the point of use may exceed the rated voltage of the arrester; Abnormal transportation or storage;
Earthquake intensity Areas with temperatures of 8 degrees and above. | | tt |
3 Technical requirements
3.1 Rated value of arrester
3.1.1 Rated voltage of arrester
Approved by National Bureau of Standards 1987-03-02
1987 -10-01 Implementation
GB7327-87
The rated voltage value of the arrester is in kV (effective value), and the values ??are as follows: 0.25
12.7
(50 )
(177)
468
0.50
16.7
51*
200
2.3*||tt ||19
69
290
Note: The voltage value in brackets is the rated voltage value of the arrester that is not recommended. 3.1.2 Rated frequency
The rated frequency of the arrester is 50Hz.
3.1.3 Nominal discharge current
3.8
(75)
310
4.6*
100
The nominal discharge current of 420
arrester is divided into four levels: 10, 5, 3, and 1kA, and its waveform is 8/20μs. 3.2 Mechanical properties of the arrester
The arrester should be able to ensure reliable operation under the following mechanical loads. a. The maximum allowable horizontal pulling force at the top of the arrester is F1, which should comply with the requirements in Table 1. Table 1 Maximum allowable horizontal tension at the top of the arrester Rated voltage of the arrester
kv
Magnetic blow valve type arrester
Maximum allowable water
Flat tension F,
kgf
Lightning arrester and protection
Rotating motor arrester
Lightning arrester
Other valve type arrester
Lightning arrester
Note: kgf= 9.80665N.
3.8~25
15
（147N）
15
（147N）
4f75
30|| tt||(294N)
30
(294N)
b． The wind pressure F2 acting on the arrester is calculated according to formula (1): F,=a
(BV)\
16
Skgf
100~200| |tt||50
(490N)
20
(196N)
Where: V. ——Basic wind speed (half-average time interval of 10 minutes), m/s, taken as 35m/s; S—wind direction projection area of ??the arrester (the ice thickness on the surface of the arrester should not exceed 20mm), m2; β—wind speed increase coefficient is generally taken 1.2:
a
is an aerodynamic coefficient. When the wind speed is 35m/s, a=0.9. 3.3 Arrester electrical characteristics
Arrester power frequency discharge voltage;
1.2 /50μus impulse discharge voltage;
wavefront impulse discharge voltage;
impulse discharge volt-second characteristics;
operation impulse discharge volt-second characteristics:
* represents neutral Rated voltage value of lightning arrester for point protection. 7.6
41
(126)
444
290~468
150
(1471N)
(1 ) | | tt | |tt||(valid value)
1
3
6
10
35
110
( 110)
220
330
500
arrester
rated
voltage
kv
( Valid values)
2
3.8
7.6
12.7
20.5
25
25
41
51
69
100
126
200
290
310
420| |tt||444
468
wave front impulse
shock discharge
wave front
steepness
kv/μs| |tt||3
32
63
106
175
208
208
343||tt ||425
573
813
980
1200
1500
1500
2000
2000
2000
Note: ①The voltage levels in brackets are not recommended. GB 7327-87
power frequency amplifier
electrical voltage
kv
(effective value)
not greater than
not less than|| tt||4
70
87
117
170
255
340
510||tt| |545
567
600
632
5
85
98
133
195
290
390
580
620
② The wavefront impulse discharge voltage requirements will be postponed for three years from the effective date of this standard. 1.2/50μs
impact discharge
electrical voltage
kv (peak value)
not greater than
6
112
134
178
260
345
520
780
834
1005
1055| |tt||1110
Table 2
Power station type valve
Magnetic blowing
Wave front
Shock discharge
Voltage|| tt||kV (peak)
not greater than
7
130
161
214
312
414
624
936
1001
1200
1265
1326
Read avoidance
operation Impact
shock discharge
voltage
kV (peak)
not greater than
8
285
570|| tt||820
870
890
940
992
arrester characteristics
Lightning
arrester|| tt||Residual voltage at nominal current (waveform
8/20μs), kV (peak value)
1kA
not greater than
9
134
5kA
not greater than
10
108
178
260
332
520| |tt||10kA
not greater than
11
820
870
913
965
1018|| tt||Operation shock
Current residual voltage
kv (peak value)
not greater than
12
820
870||tt ||890
940
992
GB7327—87
ordinary valve arrester
power frequency discharge
electric voltage||tt ||kv
(valid value)
not
not greater than
13
9.0
16.0
26.0
41
51
56
82
224
255
448
14|| tt||11.0
19.0
31.0
49
61
67
98
268||tt| |314
536
1.2/50μs
impact discharge
electrical voltage
kV (peak value)
not greater than||tt| |20.0
30.0
45.0
73
85
110
134
326
375
620
Wavefront
Shock discharge
Voltage
kV (peak value)
not greater than
25.0| |tt||37.5
56.3
91
106
138
168
408
469||tt ||775
Nominal current
Lower residual voltage
(waveform 8/20us)
kv (peak value)
5kA
Not greater than
17
13.5
27.0
45.0
67
81.5
81.5
134
Remarks
18
For use as components
For use as components
For use as components
110kV transformer
Neutral For point protection
326
410
652
Ungrounded system
GB7327—87
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electricity| |tt||System
Motor
Nominal
Voltage
kv
(effective value)
1
3.15
6.3
10.5
13.8
15.75
Arrester
rated
voltage
kv| |tt||(valid value)
2
2.3
3.8
4.6
7.6
12.7
16.7
19
Flow capacity of arrester
3.4
GB7327-87
Table 4 Characteristics of arrester for protecting rotating motors
Impact discharge current
1.2/50μs
Impact discharge voltage
power frequency discharge voltage
kV (effective value)
not less than
3|| tt||4.5
7.5
9.0
15.0
25.0
33
37
is not greater than ||tt ||4
5.7
9.5
11.4
18.0
30.0
39
44
Voltage
kV (peak value)
is not greater than
5
6.0
9.5
12.0
19.0||tt ||31.0
40
45
voltage (pre-discharge
time 10μs)
kv (bee value)
not greater than||tt ||6
6.0
9.5
12.0
19.0
31.0
40
45
Under nominal current
residual voltage (waveform
8/20μs)
kV (peak value)
3kA
is not greater than
7
6.0
9.5
12.0
19.0
31.0
40
45
Prepared|| tt||9
Note
For motor neutral point protection
For motor neutral point protection
The valve plates of the arrester should withstand 2000us square wave flow respectively. Capacity test and 18/40μs impact flow capacity test 20 times without damage (no breakdown, no flashover). These two flow capacity tests should be carried out on different test samples. The current value used for the test should be as specified in Table 5. For magnetically blown arresters with a rated voltage of 100kV and above, in addition to the valve plate flow capacity test, a long-term energy release test should also be performed. Table 5 Valve flow capacity test current value
Arrester category
Magnetic valve type arrester
Power station type arrester
Ordinary valve arrester
Electric type arrester
Low voltage valve type arrester
Protection of rotating motor arrester
Rated voltage of arrester
kV (effective value)
41~200||tt ||290~310
420~468
3.8~200
3.8~12.7
0.25~0.50
2.3~19
18/40μs impact
Current kA (peak value)
10
15
15
10
5
3
10
2000us square wave
Current A (peak value)
600
·800
1000
150| |tt||75
50
400
3.5 The large current impulse withstand performance of the arrester GB 7327—87
Current impulse test 2 times. The current values ??used for the test are specified in Table 6. Table 6 Large current impulse withstand test current value
Arrester category
Magnetic blow arrester
Ordinary valve arrester
Distribution type arrester
Protection of rotation Motor arrester
3.6 Action load endurance performance of arrester
4/10μs impulse current, kA (peak)
65
40
25|| tt||25
The arrester should withstand 20 operating load tests at the rated voltage of the arrester. The waveform of the impulse ignition current is 8/20μs, and its amplitude is the nominal discharge current of the arrester.
3.7 Lightning arrester sealing performance
The arrester should have reliable sealing.
3.8 Pressure release performance of arresters
Magnetic blow valve type arresters and arresters protecting rotating motors should have pressure relief devices. During the test, the pressure relief device should be activated. The fragments after the test sample is destroyed should not exceed the range enclosed by the specified fence. The test current value is as specified in Table 7. Table 7 Pressure release test current value
High current test
Arrester category
Magnetic blow valve type arrester
Protect rotating electrical machine arrester
Power frequency symmetrical component
Current value, kA (effective value)
20
10
Note: For other arresters, if the user needs a pressure relief device, he or she can negotiate with the manufacturer. 3.9 External insulation performance of arrester
Small current test
Power frequency symmetrical component
Current value, A (effective value)
800
800|| tt||The external insulation performance of the arrester should comply with the regulations of GB311.1-83 "Insulation Cooperation of High-voltage Power Transmission and Transformation Equipment". The wet and dry power frequency withstand voltage of the low-voltage arrester should not be less than 4kV.
3.10 Arrester conductivity current or leakage current requirements Arresters should undergo conductance current or leakage current tests, and the applied voltage and qualified current values ??are specified by the manufacturer. 3.11 Contamination migration performance of arrester
This test is to prove the ability of the discharge characteristics of the arrester to withstand the electric field distortion caused by pollution migration on the outer surface of the porcelain sleeve. This test is only conducted on pollution-resistant arresters.
3.12 Radio interference voltage and partial discharge test of arrester The radio interference test is to measure the high-frequency voltage generated by the arrester, which can cause harmful interference to communications. The interference voltage value of arresters with rated voltage GB7327-R7
of 290kV and above should not be greater than 2500uV. The interference voltage values ??of other products are not specified and only actual measured data are provided.
The partial discharge test is to measure the amount of partial discharge that occurs inside the arrester. Partial discharge can cause the insulating medium inside the arrester to deteriorate. There are no specific regulations on the internal partial discharge of various arresters, only actual measured data are provided. 3.13 Disconnector performance requirements for arresters
During the disconnector test, whether combined with the arrester or alone, there must be an obvious opening and closing indication during operation to indicate that the arrester is damaged. The disconnector itself cannot prevent the arrester from exploding. 3.13.1 The disconnector shall withstand the following tests and shall not operate. a: Large current impulse tolerance;
b. 2000μs square wave current tolerance
c. Action load tolerance;
d.18/40μs impulse current tolerance.
3.13.2 The disconnector should measure ampere-second characteristics at three current values: 20, 200, and 800A (±20%). 4 Test methods
When conducting the following tests, the arrester should be installed as close as possible to the actual operating conditions at normal temperature. The surface of the test sample should be clean and dry before testing. 4.1 Power frequency discharge voltage test
The frequency range of the power frequency power supply is: 48~52Hz or 58~62Hz. The waveform is approximately a sine wave, and the ratio of its peak value to the effective value should be equal to V2±0.07.
The power supply capacity should meet: the short-circuit current of the transformer should not be less than 1A (effective value), and the effective value of the voltage is the measured peak value divided by V2. The test should be carried out on a complete arrester, and the voltage should be applied to each sample not less than 5 times. The voltage applied to the test sample should start from zero, and under the condition that the voltmeter can read accurately, it should rise evenly and quickly until the test sample is discharged. After each discharge, the power frequency power supply should be cut off within 0.5s, and the voltage should be passed through the test sample. Power frequency current should be limited to 0.20.7A (effective value). The time interval between each application of voltage should be no less than 10 seconds. For arresters with voltage equalizing resistors, the time after the voltage exceeds the rated voltage of the arrester should be controlled within 2 seconds as much as possible. During routine testing, the number of measurements should be no less than 5 times. During the type test, the number of measurements should be no less than 10 times, and the voltage value of each discharge should comply with the requirements in Table 2, Table 3, and Table 4.
The type test should also be carried out in the rainy state, and the test conditions should comply with the corresponding provisions in GB311.2-83 "High Voltage Test Technology Part 1: General Test Conditions and Requirements". During the wet and industrial discharge test, the number of measurements should be no less than 10 times. The arithmetic mean should not exceed the range specified in Table 2, Table 3 and Table 4. Each measured data shall not exceed 5% of the upper limit of the specified value and shall not be lower than 5% of the lower limit. During the test, no flashover should occur in any insulating part except gap discharge. 4.2 Impulse discharge voltage test
4.2.11.2/50μs impulse discharge test
Use the impulse voltage of 1.2/50μs waveform and the expected peak value specified in Table 2, Table 3 and Table 4 to test the entire The arrester is applied with positive and negative polarity 5 times each. All arresters should be discharged, and one non-discharge is allowed. At this time, the impulse voltage of the same polarity should be applied 10 times. If all arresters should be discharged, the sample is deemed to have passed this test. The waveform adjustment deviation is as follows:
The peak value is between 97% and 100% of the specified value; the apparent wavefront time is 0.85~1.6μs;
The apparent wave tail time is 40~60μs;
The oscillation at the beginning of the apparent wave front (less than 50%) should not exceed 10% of the peak value. Small oscillations near the wave peak are allowed, but their amplitude should be less than 5% of the peak value.
4.2.2 Impact discharge volt-second characteristic test
This test should be carried out on the entire arrester, using positive or negative polarity impact, and the polarity with the higher discharge voltage should be selected. In order to draw the characteristic curve, the voltage of 1.2/50μs should be gradually increased, starting from a discharge voltage lower than the arrester, until the impact wavefront steepness is equal to
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