This standard specifies the terms, ratings, design and structure, test methods, inspection rules, marking, packaging, transportation, storage, usage guidelines, etc. of AC high-voltage current-limiting fuses. This standard is applicable to indoor or outdoor fuses in AC power systems with a rated voltage of 3~63kV and a frequency of 50Hz. GB 15166.2-1994 AC high-voltage fuse current-limiting fuse GB15166.2-1994 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
AC high-voltage fuses
Current-limiting fuses
Alternating-current high-voltage fusesCurrent-limlting fuses
GB15166.2—94| |tt||This standard refers to the International Electrotechnical Commission (IEC) publications 282-1 "Current-limiting fuses" (1985 edition), 644 "Regulations on high-voltage fuses for motor circuits" (1979 edition) and 787 "Usage "Guidelines for the selection and use of high-voltage fuses in transformer circuits" (1983 edition).
1 Subject content and scope of application
This standard specifies the terminology, ratings, design and structure, test methods, inspection rules, and markings of AC high-voltage current-limiting fuses (hereinafter referred to as fuses) , packaging, transportation, storage, usage guidelines and other contents and requirements. This standard is applicable to indoor or outdoor fuses in AC power systems with a rated voltage of 3 to 63 kV and a frequency of 50 Hz. 2 Reference standards
GB191 Packaging, storage and transportation pictorial mark
GB311.1 Insulation coordination of high-voltage power transmission and transformation equipment GB763 Heat generation of AC high-voltage electrical appliances during long-term operation GB772 Technical conditions for high-voltage insulator porcelain parts|| tt||GB4857.7 Basic test for transportation packages Sinusoidal vibration (fixed frequency) test method GB5273 Terminal blocks for high-voltage electrical appliances, transformers and bushings GB5465.2 Graphical symbols for electrical equipment
GB11022 General technical conditions for high-voltage switchgear GB/T15166.1 Terminology for AC high-voltage fuses GB/T15166.4 General test methods for AC high-voltage fuses GB15166.5 Fuses for external protection of AC high-voltage fuses in parallel with capacitors 3 Terminology
Terminology used in this standard is in accordance with GB /T15166.1 regulations. 4 Category
The classification of fuses is shown in Table 1.
State Bureau of Technical Supervision approved on 1994-08-12 for implementation on 1995-02-01
Protection scope
Installation site
Object of protection
Note: 1 ) See GB15166.5.
2) Protection objects other than T, M, P and C types. 5 Normal use conditions
GB15166.2-94
Table 1
The normal use conditions of the fuse are in accordance with Chapter 3 of GB11022. General, backup, full range
Indoor, outdoor
For T-type protection transformers
For M-type protection motors
For P-type protection voltage transformers||tt| |For C-type protective capacitors
The protection object is not specified\
G type
If the usage conditions are different from GB11022, the user should negotiate with the manufacturer, and the low temperature arc must be pointed out The pre-time-current characteristics have a significant impact. If there are requirements for this, the manufacturer should also be consulted. 6 Rated parameters
6.1 Rated voltage
The rated voltage and maximum voltage are selected according to Table 2. Table 2
Rated voltage
Maximum voltage
3
3.5
6
6.9
Note: Other than Table 2 The rated voltage value is negotiated between the user and the manufacturer. 6.2 Rated insulation level
10
11.5
20
23
35
40.5
according to GB11022. However, the 1-minute power frequency withstand voltage wet test is only used for the relative ground of outdoor products. kv | The requirements for isolation fracture are 48kV, 35kV to ground and phase-to-phase 95kV, and high-isolation fracture 110kV. 6.3 Rated current
The rated current of the fuse base and fuse piece is recommended to be selected from the values ??in Table 3. Table 3
Base rated current\
25
63
125
200
400
Note: 1) Not suitable for P-type fuses;
rated current of fuse 1).2
1.6,3.15,6.3,8,10,12.5,16,20,2531.5,40,50,63| |tt||80,100,125
160,200
250,315,400
A
GB15166.2—94
2) When the rated current series in the table is not enough for selection, Can be selected in the R20 number system. 6.4
Rated short-circuit breaking current
The rated short-circuit breaking current is selected from the following values: 6.3,8,10,12.5,16,20,25,31.5,40,50,63,80,100 kA. 6.5 Rated frequency
The rated frequency is 50Hz.
6.6 Expected transient recovery voltage (TRV)
The expected transient recovery voltage is specified in Table 4.
Table 4
Basic parameters
Rated voltage
Maximum voltage
kv
3
3.5||tt| |6
6.9
10
11.5
20
23
35
40.5
63
72.5
Test method
1
2
1
2
1
2| |tt||1
2
1
2
1
2
peak
voltage||tt ||Ue
kv
6
6.4
11.8
12.7
19.7
21
39. 4
42.3
69.5
74.4
124
133
peak
time
ta
s
40
120~160
49
156~208
58
180~240| |tt||84
264~352
114
345~460
165
504~672
Delay|| tt||ta
8
6
7
9
13
17
8||tt| |Export parameters
Time delay parameter
Contact voltage
U
kv
2.0
3.9
6.6|| tt||one
13
one
23.2
41
delay
reference
time||tt ||s
19
24
28
41
55
-
64
Rise rate
Ue/ts
kv/μs
0.15
0.0530.04
0. 24
0.08~0.06|| tt||0.34
0.12~
0.088
0.47
0.16~0.12
0. 61
0.22~0.16||tt ||0.75
0.265~
0.199
Alternate parameters
Amplitude
Coefficient
1.4
1.5||tt ||14
1.5
1.4
1.5
1.4
1.5
1.4
1.5
1.4
1.5
natural frequency
f.
kHz
8.4
3.1~3.2
6.8
2.4~7.8
5.8
2.1~1.6
3.8
1.4~1.1
2.9| |tt||1.1~8.2
2
1.4~1.9
Note: t, U\, t of test method 2 are not specified because the initial part is not important to the fuse , but the rising section must be between the two lines of the specified ts tolerance. 7 Design and structure
7.1 Temperature rise
The maximum allowable temperature and allowable temperature rise of the parts, materials and media other than the melt of the fuse are in accordance with Article 3.2 of GB763. Note: P-type fuses do not specify temperature rise requirements. 7.2 Characteristic curves and characteristic values ??
The manufacturer should provide the following characteristic curves and characteristic values: a.
b.
pre-arc time-current characteristic curve;
cut-off Current characteristic curve;
Maximum action It value and pre-arc I't value.
c.
7.2.1 The pre-arc time-current characteristic curve is expressed as an average value. The allowable deviation of the current is ±20%, and the time range is 0.01s to 600s and above. When the pre-arc time corresponding to the minimum breaking current is less than 600s, the dotted line is extended to 600s. When it is greater than 600s, it should be given according to the actual time (1h or more), see Figure 1. Money back
600
.0
GB15166.2—94
600s
Small breaking current
<6008|| tt||Expected current, A
Figure 1 Pre-arc time-current characteristic curve time range requirements 7.2.2 Pre-arc time-current area limit and overload tolerance characteristics should meet the requirements of Table 5. Table 5
Pre-witch time - current area limit
Protected objects
T type
M type
G type
P type| |tt||Convention not to melt current
Ino/Ia
6
Not specified\
When I100A
>3
When I>100A
≥4
ro1/Ih
(100>0.25
In
≥7(
0> 0.25
Ifa
200
2)
Under consideration
Note: 1) If there is a requirement for the agreed non-melting current, it will be given by the manufacturer . Over-resistant characteristics
Under consideration
See 7.2.3
Under consideration
2) When the protection object of the product is determined, if a front arc is required The time-current area limit and over-cut resistance characteristic requirements shall be negotiated between the user and the manufacturer. In the table: I - Rated current of the fuse:
Ino
Expected current (average value) when the pre-arc time of a fuse is 10s Ifo.1 - When the pre-arc time of the fuse is 0.1s expected current (average). 7.2.3 For M-type products, when the starting frequency does not exceed 6 times per hour and the continuous starting does not exceed 2 times, it should be able to withstand overload characteristics of KIno current, 2000 times and 100 cycles. The K value is a coefficient less than 1, which is related to the working conditions. The K value determined at 10s is valid from 5s to 60s. When the working conditions are different from this, consultation should be made with the manufacturer. 7.3 Breaking capacity
The fuse shall have the following breaking capacity:
rated maximum breaking current 1.
a.
b.
Breaking current 2 close to the maximum arc energy. C.
GB15166.2-94
Minimum breaking current I. For general fuses, it refers to the 1h melting current. For backup fuses, it refers to the minimum rated breaking current. For full-range fusing Device refers to the melt melting current. d. Out-of-phase ground breaking current I.
The operating overvoltage generated when the fuse is opened should not exceed the requirements in Table 6A. When the rated current of the fuse is not greater than 3.2A and the operating overvoltage duration is not greater than 200μs (see Figure 2), the maximum allowable operating overvoltage should not exceed the requirements in Table 6B.
Table 6A
Rated voltage
3
6
10
20
35
63
Table 6B
Rated voltage
3
6
10
20
b
Max. Operating overvoltage (peak value)
12
23
38
75
126
226
Maximum operating overvoltage Voltage (peak)
26
36
50
85
Q
time
is not more than 3.2A Allowable operating overvoltage of rated current fuses Figure 2
a - operating overvoltage curve b operating overvoltage limit (Table 6A) c - operating overvoltage limit (Table 6B) d - duration 200μs operating device || tt | | 7.4 | | tt | A special device is used to easily remove and install the fuse (when the structure allows).
7.5 Interchangeability
The installation dimensions of fuses and fuse parts of the same model should be consistent and interchangeable. 7.6 Indicators and strikers
The fuse piece should have an easy-to-observe indicating device indicating fusion (P type is allowed to have none). Fuses with impactors shall meet the requirements of Table 7 and Figure 3.
Type
Lightweight
Medium
Heavy duty
Energy
J
0.3±0.25
1 ±0.5
2±1
free travel
OA
mmbZxz.net
2
4
4||tt ||Table 7
rows
working schedule
AB
mm
9
16
6||tt ||成
minimum
OB
mm
10
20
10
maximum
oc
mm
30
40
16
minimum
bearing capacity
N
No Apply
20
40
maximum
duration of stroke
ms
100
100||tt| | 100 |
Figure 3 different stages of the impactor stroke
OA is the free stroke, the energy output is not specified, AB is the working stroke (the specified energy must be transmitted when reaching point B); OB is the minimum actual stroke; OC - ??maximum actual stroke; CB - maximum allowable return stroke under the action of bearing force (when applicable) 7.7 Grounding
There should be a grounding terminal on the base of the fuse, and the contact surface should be a rust-proof metal surface And there are fasteners not smaller than M12, and there should be a grounding symbol in compliance with GB5465.2 nearby. 7.8 Terminal block
The plate terminal block of the fuse base shall comply with the regulations of GB5273. 7.9 Structural dimensions
The structural dimensions of the fuse are recommended to be selected according to Appendix D. 7.10 Installation
Fuses are allowed to be installed in different ways, but measures should be taken to prevent the fuse from loosening and ensure good contact. 7.11 Insulator
The insulator used with the fuse should comply with the relevant regulations of GB772. 7.12 Corona
P-type fuses should consider taking measures to prevent corona. 8 Test methods
8.1 Overall dimensions and appearance inspection
Conduct according to product technical documents and drawings. 8.2 Insulation test
shall be carried out in accordance with Article 6 of GB/T15166.4. 8.3 Temperature rise test
shall be carried out in accordance with Article 7 of GB/T15166.4. 8.4 Resistance measurement of fuse parts
According to GB/T15166.4Article 9 is carried out. 8.5 Pre-arc time-current characteristic test
GB15166.2-94
shall be carried out in accordance with the provisions of Article 8 of GB/T15166.4. The test points shall at least meet the requirements of Table 8 and the provisions of Article 7.2.1. And the 0.1s and 10s characteristic values ??are in accordance with Table 5, and the data obtained from the breaking test can be used. 8.6M Type Overload Resistance Characteristics Test
8.6.1 The test circuit and sample layout are the same as the temperature rise test, and shall be carried out in accordance with the requirements of Table 5 and 7.2.3. 8.6.2 The current tolerance of current KIn and current KI1o/6 is +1°%, and the tolerance of 10s duration and intermittent period is ±0.5s. Follow the following procedure:
Table 8
T type
Agreed non-melting current
Minimum breaking current
600s melting current
10s melting current
0.1s melting current
0.01s melting current
Test method 1:
M type
No melting current agreed||tt| |600s melting current
10s melting current
0.1s melting current
0.01s melting current
G type
Convention not to melt current||tt| |2 times rated current
10s melting current
0.01s melting current
Verify continuous starting of 2 working conditions for 100 cycles, each cycle is (see Figure 4): KIn continuous 10s—
Intermittent period 10s—KIno lasts 10s and transfers to KIno/6 and lasts 3560s-:comP type
Not specified
Intermittent period 10s-
Klpe|| tt||Klm/6
Test method 2:
102030
cycles
GB15166.2—94
00 times Durban||tt ||35903600
Figure 4M type test method 1
Verify 1h starting 6 times of working conditions and 2000 cycles, each cycle is (see Figure 5): KIno lasts for 10s and transfers to KIno/6 for 290s -I
One cycle
Kln
Klra/6
300
Interpayment period 300s
2000 cycles||tt| |600
Figure 5M type test method 2
t(s)
t(s)
8.6.3 The test sample should take the maximum and minimum ratings in the same series The K value of the current fuses can be tested, and the K value can be the same or different. The K value of the intermediate fuse is determined according to the following principles: if the K value is the same, the fuse with the intermediate rated current is also considered applicable. a.
bK values ??are different. The K value of the fuse with intermediate rated current is determined according to the linear insertion method in Figure 6. When the K value of the fuse with an intermediate rated current given by the manufacturer is different from the K value obtained by the linear interpolation method, the fuses with different K values ??c.
shall meet the test requirements. | |tt | There should be no significant change in the resistance value of the test sample measured at the temperature compared with the specified value. If there is any doubt, pass KIno to the test sample to make it operate. At this time, the pre-arc time should be within the specified pre-arc time-current characteristics allowable. within the difference range.
8.7 Breaking test
8.7.1 The test is carried out on a single-phase circuit. The wiring of the test sample is arranged according to Figure 7. In order to prevent the movement of the connecting bus bar, the distance from the fuse terminal is not less than 0.5m. The parts are fixed with insulating parts, and the busbar can be bent after being fixed. Fixed point of insulation parts
Figure 7 Wiring arrangement for breaking test
8.7.2 Test circuit according to Figure 8a, 8b
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