Some standard content:
National Standard of the People's Republic of China
AC high-voltage fuses
Injection fuses
Alternating-current high-voltage fusesExpulsionfuses
GB15166.3—94
This standard refers to the International Electrotechnical Commission (IEC) Publication 282-2 "AC High-Voltage Injection Type and Similar Fuses" (1970 Edition) and Publication 282-2 Revision 1 (1978 Edition). 1 Subject content and scope of application
This standard specifies the rated parameters, design and structure, test methods, inspection rules, marking, packaging, transportation, storage, etc. of AC high-voltage injection fuses (hereinafter referred to as fuses) and requirements. This standard applies to indoor or outdoor drop-out and non-drop-out fuses in AC power systems with a rated voltage of 3 to 63 kV and a frequency of 50 Hz.
This standard also applies to fuses in combined electrical appliances. 2 Reference standards
GB191 Packaging, storage and transportation pictorial mark
GB763 Heat generation of AC high-voltage electrical appliances during long-term operation GB772 Technical conditions for high-voltage insulator porcelain parts
GB5273 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 3 terms || tt||The terminology used in this standard is specified in GB/T15166.1. 4Normal use conditions
should comply with the provisions of Chapter 3 of GB11022. If the usage conditions of the fuse are different from those specified in GB11022, the user should negotiate with the manufacturer. It must be pointed out that low temperature has a significant impact on the pre-arc time-current characteristics, and when there are requirements for this, the user should negotiate with the manufacturer. 5 Rated parameters
5.1 Rated voltage
See Table 1 for rated voltage and maximum voltage.
State Bureau of Technical Supervision approved on 1994-08-12 for implementation on 1995-02-01
rated voltage
maximum voltage
5.2 rated current
3| |tt||3.5
5.2.1 The rated current of the base is selected from the following values: 50,100,200A
GB15166.3—94
Table 1
6||tt| |6.9
10
11.5
20
23
35
40.5
5.2.2 Rated current of fuse It is selected from the R10 number system. When it cannot be satisfied, it can be selected from the R20 number system. 5.3 Rated maximum breaking current
The rated maximum breaking current is selected from the following values: 2.5, 3.15, 4, 5, 6.3, 8, 10, 12.5, 16, 20kA5.4 Rated insulation level ||tt| |According to the provisions of GB11022, but the 1-min working withstand voltage wet test is only used for the relative ground of outdoor products. kv | The breaking point is 48kV; the 35kV grounding and phase-to-phase isolation breaking point is 95kV and the requirement is 110kV. 5.5 Transient recovery voltage
The natural frequency and amplitude coefficient of the transient recovery voltage are shown in Table 2. Table 2
Rated voltage
kv
Natural frequency
kHz
Amplitude coefficient
6 Design and structure
6.1 Temperature rise
3
8.5
6
4.7
10
3. 2
1.4~1.5|| tt||20
2.1
35
1.6
63
1.0
Parts, materials and The maximum allowable temperature and allowable temperature rise of the medium are specified in Article 3.2 of GB763. 6.2 Pre-arc time-current characteristics
6.2.1 The pre-arc time-current characteristic curve is expressed as an average value. The allowable deviation of the current is ±10%, and the time range is 0.01s to 300s or 600s.
6.2.2 The manufacturer should specify the fuses to be used and provide the pre-arc time-current characteristic curve of the same series of fuses. It is recommended that the fuses specified in Appendix A be used for drop-out fuses.
6.3 Operating device
The drop-out fuse should be able to easily remove and install the fuse-carrying part with a hook rod or other special device, and operate the opening and closing operations when there is voltage and no current, only for 10kV If a drop-out fuse needs to open and close a transformer no-load current of no more than 2A, certain conditions should be followed. 6.4 Fitting dimensions
The fitting dimensions and installation dimensions of fuses of the same model and specifications should be unified, and the parts should be interchangeable. 6.5 Grounding
Fuses with metal bases should have terminals for grounding. The metal surface should be exposed at the contact point and have anti-rust measures and fasteners not smaller than M12. The vicinity should be marked with GB5465. 2 Specified grounding symbols. 6.6 Terminal
The terminal block should be able to clamp the hard or soft wires specified in Table 2 of GB/T15166.4. When the terminal block is a plate structure, it should comply with the regulations of GB5273.
6.7 Insulators, corrosion protection, fastening
GB15166.3-94
The insulators used should comply with the relevant regulations of GB772. Ferrous metal parts should have anti-corrosion measures. Threaded fasteners should have anti-loosening devices.
6.8 Action signs
There should be obvious signs after the non-drop-out fuse operates. The drop-out fuse should be in the normal drop position after operation. 6.9 Distance between poles
The manufacturer should give the minimum distance between poles of the fuse. 6.10 Breaking capacity
The fuse should be able to break the rated maximum breaking current and the expected current below, and the breaking performance should meet the requirements and procedures specified in Article 8.6. Fuses are allowed to be used in systems with lower than rated voltage, but the breaking capacity cannot be lower than the rated maximum breaking current. 6.11 Mechanical stability
Drop-out fuses should have good mechanical stability. Those below 35kV should be able to withstand 500 times, and those with 35kV and above should be able to withstand 300 consecutive opening and closing operations.
7 Test methods
7.1 Appearance and dimensional inspection
Conduct according to product technical documents and drawings. 7.2 Contact performance inspection
Use a feeler gauge below 0.05mm or light transmission inspection. 7.3 Insulation test
shall be carried out in accordance with Article 6 of GB/T15166.4. 7.4 Temperature rise test
shall be carried out in accordance with Article 7 of GB/T15166.4. 7.5 Mechanical stability test (only for drop type) 7.5.1 The test sample shall comply with the provisions of Article 5 of GB/T15166.4. When operated with special tools or operating rods, the test sample shall be installed at a height of not less than 2.5m from the ground. Architecturally.
7.5.2 In order to avoid the change in the contact performance of the upper and lower contacts caused by the elongation and deformation of the fuse during the test, the fuse should be replaced by a metal wire with a small elongation rate, and the operating tool should be used in accordance with the provisions of 6.11 without charging. Continuous opening and closing operations. No maintenance or adjustment is allowed during the test. After the test, there should be no deformation or damage that would hinder normal operation, and the temperature rise of each part should not exceed the specified value. 7.6 Breaking test
7.6.1 The test sample shall comply with the provisions of Article 5 of GB/T15166.4 and a single-phase test shall be carried out on the unipolar test sample. 7.6.2 The test frequency is 4852Hz.
7.6.3 The parameters and procedures of the breaking test are specified in Table 2 and Table 3. a. Breaking current capacity
Mode 1 rated maximum breaking current I
Mode 20.7~0.81
Mode 30.2~0.3Ibzxz.net
b. Lower breaking fault Current capability
mode 4400～500A
mode 52.7～3.3I., the minimum value is 15A, I is the rated current of the fuse. Parameters
number
power frequency recovery voltage
solid value of transient recovery voltage
frequency amplitude coefficient
expected symmetrical breaking
Current effective value
power factor
closing angle (degree) after voltage crosses zero
rated current value of fuse
number of tests|| tt||Number of tests per load of fused parts
Method 1
1+%
First test
-5～+15°||tt| |Second test
85°~105°
Third test
130°~150°
Minimum value
3||tt ||Maximum value
3
3
GB15166.3-94
Table 3
Test
Method 2||tt| |Verification
square
mode 3
formula
maximum voltage U.*%
see table 2
0.7~0.81|| tt||0.07~0.15
First test
-5°～+15°
Second test
85~105°
Minimum value
2
Maximum value
2
4
0.20.31
All tests
85~105 °
Minimum value
Maximum value
1
2
Note: 1) When limited by test conditions, the power frequency recovery voltage is allowed to be no less than 95% of maximum voltage. 1
2) If the action time is greater than 2s, the test needs to be conducted at a higher current to obtain an action time of 2s. 3) If the breaking current in mode 4 is less than the value of mode 5, mode 5 will no longer be tested. Method 4
under consideration
400~500A2),3)
0.3~0.5
any
minimum value
2| |tt||4
Method 5
Not applicable
2.7~3.31.
Minimum value 15A*
0.6~0.8
Meaning
minimum
2
4) During the test, if limited by the test conditions, the structure of the fuse piece and the melt composition remain unchanged, and the melt volume only changes slightly. , allowing any method to be used to shorten the pre-arc time of the fuse.
7.6.4 The power frequency recovery voltage duration is 0.5s for drop-out fuses and 15s for non-drop-out fuses, and its frequency can be lower than the specified minimum value.
7.6.5 The wiring of the test sample should be arranged according to Figure 1. The connecting wire should be fixed with an insulating piece at a distance of not less than 0.5m from the terminal and then bent. Set metal shields on both sides of the test sample, with its position at half of the minimum phase-to-phase distance stipulated by the manufacturer. Set one or more shields according to the possible discharge paths on both sides of the test sample. Use copper between all shields and the grounding electrode. The wire is connected in series with a resistive wire with a diameter of 0.1 mm, a resistivity of about 40 μQ·cm, and a length of 100 mm.
7.6.6 Typical test circuits are shown in Figures 2 and 3. The method of determining the expected breaking current and power frequency recovery voltage on the oscilloscope is shown in Figure 4. For all test modes, the expected breaking current is the symmetrical effective value of the current measured at the end of the pre-arc time. GB15166.3-94
Insulation fixed point
Figure 1 Wiring arrangement of breaking test
Figure 2 Typical test circuit of breaking test test mode 1, 2, 3 Figure 3 Typical test circuit for breaking test test methods 4 and 5 GB15166.3-94
A - removable conductor for metal short circuit test, B - fuse under test, D - power supply protective circuit breaker, E - closing switch; O, - current measurement; O, - recovery voltage measurement; O, - reference voltage measurement; T1, T: - possible position of the transformer, Z power supply side adjustable impedance (for all test methods); Z1 - negative Transformers with adjustable impedance on the trimmed side (test methods 4 and 5) or short-circuited secondary terminals, F1 - transient recovery voltage regulator on the power side (all test methods), F2 - transient recovery voltage regulator on the fault side (test Modes 4 and 5) Telephone
Recovery voltage
Reference voltage
Current 1
Recovery voltage
test power
expected breaking current (effective value) I=
Recovery voltage U:
B
2/2
22
Previous time
Figure 4 is composed of The oscillogram determines the expected breaking current and power frequency recovery voltage. 7.6.7 Breaking test. Replace the fuse-carrying parts according to the requirements in Table 3 of Article 7.6.3. All other components should maintain normal functions. After completing one breaking, no replacement is required except as specified. Except for components and parts that are allowed to be ablated, slight damage to other parts is allowed, but it cannot affect normal working ability. During the test, there must be no flashover outside the test product or to the ground, and the resistance wire connected in series in the metal shield cannot be fused. After the test, the test sample should be in the specified normal breaking position or state. 7.7 Homogenous series
Fuses constitute a homogeneous series when they meet the following conditions: a.
b.
c.
d.
e.|| tt|| The rated voltage and frequency are the same;
The base is the same;
The fuse-carrying parts are the same;
The installation size of the fuse is the same,
The fuse size depends on the rating of the fuse The current changes monotonically, and when the maximum and minimum rated current fuses of the same series meet the requirements of Article 7.6.3 and Article 7.6.7, the fuses with intermediate values ??are considered to have the same breaking performance.
GB15166.3-94
If the maximum or minimum rated current fuse fails once during the test, the failed fuse is allowed to be removed and moved to the intermediate value specification to form a new family series , the newly formed homogeneous series shall be re-tested in accordance with the specified requirements and procedures. 7.8 No-load current test of switching transformer
The method and parameters of no-load current test of switching transformer shall be negotiated by both parties of supply and demand. 7.9 Pre-arc time-current characteristic test
shall be carried out in accordance with Article 8 of GB/T15166.4. 8 Inspection rules
The inspection of fuses is divided into type test and factory inspection. 8.1 Type test
Type test is a test to verify whether the product performance meets the standards. The test specimens for the type test should comply with the product technical documents and drawings. 8.1.1
Type test items
a.
b.
c
d.
e
f .
h.
Appearance and dimensional inspection,
Contact performance inspection;
Insulation test;
Temperature rise test;
Mechanical Stability test (for drop-type products); breaking test;
pre-arc time-current characteristic test,
switching no-load transformer current test.
8.1.2 Type testing should be carried out under the following circumstances a.
b.
c.
New product design;
When product design, If there is a major change in technology or materials, the corresponding part of the type inspection should be carried out. Products produced by transferred factories,
d.
Products produced normally should undergo type testing every 8 to 10 years, among which The interruption test allows only the test method 1 to be carried out according to the maximum rated current specification in the same series. 8.2 Factory inspection
Each product must pass the inspection by the quality inspection department of the manufacturer before leaving the factory. 8.2.1 Factory inspection items
a. Appearance and size inspection;
b. 1min power frequency phase-to-ground dry withstand voltage test; contact performance inspection.
c.
9 Packaging, marking, transportation, storage
9.1 Each fuse should have a nameplate, and the nameplate should indicate: a.
b.||tt ||c
d.
e.
f.
g.
Manufacturer name or trademark,
Product model, Name;
rated voltage, kV,
rated current, A!
Rated breaking current, kA,
Factory number (this requirement applies to products of 35kV and above): Manufacturing date.
9.2 The following signs and symbols should be on the packaging box a.
b.
Product model and name;
Manufacturer name;
c.
Product quantity, weight and dimensions,
GB15166.3-94
There are signs such as "up", "handle with care", "fragile", "afraid of getting wet", etc., and should comply with the regulations of GB191. d.
9.3 The technical documents provided with the product include: a. Packing list,
b. Product certificate,
c. Product Manual.
9.4 Fuses should have packaging specifications. The packaging should be able to ensure that the product will not be damaged, deformed, damp and corroded during transportation, and should be suitable for transportation, loading and unloading.
9.5 The product storage place should be dry, well ventilated, and free from rain and snow. Al
A2
Scope of application
GB15166.3—94
Appendix A
fuse parts for drop-out fuses
(reference )
This appendix is ??applicable to the fuse components used with drop-out fuses. Other jet fuses can be adopted as a reference. Type classification
Fast fuse, its melting rate is 6~8K type
T type slow fuse, its melting rate is 1013 Note, the melting rate refers to the expected current of 0.1s and 3008 or 600s ratio of the expected current. 3Technical requirements
A3
A3.1 rated current is in accordance with Article 5.2.2.
A3.2 pre-arc time range is 0.01s～300s, which is suitable for fuses with rated current of 100A and below. Pre-arc time range is 0.01s～600s, which is suitable for fuses with rated current of 100A and above. The expected current for the pre-arc time of 300s or 600s should be twice the rated current of the fuse. A3.3 Pre-arc time-current characteristic curve of fuses. For fuses with rated current above 6A, the expected current allowable deviation is ±10% of the average value, and ±20% for others. The melting rate should comply with Type K or Type T regulations. A3.4 The static tensile force of the fuse piece should not be less than 50N. When the melt is made of low melting point alloy, measures should be taken to prevent elongation under hot stress conditions.
The leads of A3.5 fuse parts must be treated with anti-corrosion treatment. A3.6 The maximum outer diameter of the crimping point between the melt and the lead shall not be greater than that specified in Table A1. Table A1
Rated current of fuse, A
≤50
65~100
125~200
A3.7
A3 .8
The diameter of the fuse button button is shown in Table A2.
Rated current of fuse, A
≤100
>100~200
Table A2
The maximum allowable outer diameter of the crimping point, mm|| tt||6
10
15
Button outer diameter, mm
19
25
Button fuse and The matching structural dimensions of the pressure relief cap are shown in Table A3 and Figure A1. Table A3
Rated current of fuse-carrying part, A
Item
Button diameter of fuse part
Pressure action zone diameter
Thread size||tt| |D
M
mm
≤100
19
19.5
M24X1.5-6H/6g
>100~200
25
25.5
M30×1.5-6H/6g
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