Some standard content:
GB6568.22000
This standard adopts IEC60895:1987 "Group shielding suits for live working at voltage levels of 800kV and below", and revises GB6568.2-1986 "Test methods for shielding suits for live working". The international standard is partially adopted in terms of main technical content, and the writing format and rules are based on GB/T1.1-1993 "Guidelines for standardization work Unit 1: Rules for drafting and expressing standards Part 1: Basic provisions for standard writing". When revising GB6568.2-1986 by adopting IEC60895, the contents in GB36568.2-1986 that have been proven to be suitable for my country's situation and do not hinder international use are also retained. According to the provisions of GB/T1.1-1993, the foreword of this international standard is retained. This standard is arranged in accordance with GB/T1.11993, and adds 2 chapters, namely: Chapter 1: Scope, Chapter 2: Application Standard; Chapter 1: Clothing Test Methods in the original standard is Chapter 3 of this standard, and Chapter 2: Finished Product Test Methods in the original standard is Chapter 4 of this standard.
This standard replaces GB6568.2-1986 from the date of implementation. This standard is proposed by the Electric Power Department of the State Economic and Trade Commission. This standard is under the jurisdiction of the National Technical Committee for Standardization of Live Working. The drafting units of this standard are: Wuhan Isolation Voltage Research Institute, Wuhan Power Supply Bureau. The main drafters of this standard are: Zhang Lihua, Zhang Yingping, Yi Hui, Li Hansheng, Ou Qihe. This standard was issued in July 1986 and revised in July 2000. This standard is interpreted by the National Technical Committee for Standardization of Live Working. 82
GB 6568.2—2000
IEC Foreword
1) This formal technical decision or agreement of the International Electrotechnical Commission is prepared by the participation of all the national committees of the committee that are particularly interested in it. It expresses the international opinions on this matter as much as possible. 2) This standard is recommended for use internationally so that member countries can accept it. 3) In order to promote international unification, the International Electrotechnical Commission hopes that member countries will adopt its recommended standards as much as possible. If there is any difference between the recommended standards and the corresponding national standards of member countries, they should be clearly stated in their national standards as much as possible. This standard was prepared by the IECTC78 Technical Committee on Live Working Tools for Six Months
78 (Central Office) No. 15
Voting Communiqué
78 (Central Office) No. 21
All information on the vote in favor of this standard can be found in the voting communiqué in the table above. This standard refers to the following International Electrotechnical Commission publications: IEC 50(151:1987 International Electrotechnical Vocabulary Chapter 151 - Electromagnetic Equipment
IEC 212:1971 Standards for use before and during testing of solid insulating materials IEC 456:1974 Methods for measuring the performance of electrical clothing for household washing machines, Amendment 1 (1980) Other publications cited: International Standards Association Standard 5 Publication Natural dimensions - Designations and tolerances IEC 479:1975
IEC 3290:1975
- Bearing parts -
Rolling bearings
Balls for rolling bearings
1 Scope
National Standard of the People's Republic of China
Test method of screen clothes for live working
Test procedure of screen clothes for live working GB6568.2---2000
eqv IEC 60895:1987
Replaces GB 6568.2--1986
This standard is a special test method for shielding clothing for live working and needs to be used in conjunction with GB6568.1--2000 "Shielding Clothing for Live Working".
2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB6568.1-2000 Shielding clothing for live working GB/T16927.2--1997 High voltage test technology Part 2: Measurement system (eqvIEC60060-2:1994) IEC60456:1980 Method for measuring the performance of electrical clothing for household washing machines 3 Clothing material test method
3.1 Shielding efficiency test
3.1.1 Main equipment
a) A sine wave voltage generator with a frequency of 50Hz and an effective voltage of 600V (the waveform meets the requirements of GB/T16927.2);
b) A brass electrode manufactured according to Figure 1, with a built-in 2M2 load resistor and a total weight of 3kg; c) A voltage measuring instrument (voltmeter or oscilloscope) with an input impedance greater than 10MQ; d) A voltmeter with a range of 600V;
e) A rubber plate with a diameter of 400mm and a thickness of 5mm±0.5mm, and a surface hardness of 60~65 degrees on the Shore scale; f) A brass plate with a diameter of 300mm and a terminal; g) A circular insulating plate with a diameter of 400mm. Approved by the State Administration of Quality and Technical Supervision on July 14, 200084
Implemented on December 1, 2000
3.1.2 Samples
3.1.2.1 Sampling
GB6568.2-2000
1-Upper cover, 2-Shielding shell; 3-Fixed cable screw hole; 4-Cable connection measuring instrument, 5-Grounding nut; 6-Shielding electrode; 7-Insulating plate; 8-Receiving electrode; R-Load electrode Figure 1 Clothing shielding efficiency test electrode device
The sample can be cut from the large piece of fabric. If it is necessary to cut from the large piece, the sample must be taken at least 2m away from the end of the fabric. The center point of the sample must be on the 45° diagonal line of the sample fabric. There must be no serious defects that affect the test results and uneven impregnation of the finishing agent on the sample. The sample area is determined according to the test operation requirements. 3.1.2.2 Preparation of samples
Cut square samples of 180mm×180mm from the sample cloth at least 50mm away from the edge of the cloth, a total of 3 pieces. 85
3.1.2.3 Treatment of samples
GB6568.2-2000
Before the test, the sample needs to be placed in an environment with a temperature of 23℃±2℃ and a relative condensation of 45%~55% for more than 24 hours to adapt to the test environment.
3.1.3 Test conditions
The test needs to be carried out in an environment with a temperature of 23C±2C and a relative humidity of 45%~55%. 3.1.4 Test installation
3.1.4.1 Place the following components in order on a horizontal support a) a circular insulating plate with a diameter of 400mm; b) a circular metal plate with a diameter of 300mm; c) a synthetic rubber plate with a diameter of 400mm, d) a sample with a minimum size of 120mm×120mm; e) an electrode device (the placement position is not allowed to exceed the edge of the sample). 3.1.4.2 Connect the following terminals together and ground them: a) the low-voltage end of the voltage generator:
b) the grounding part of the electrode device;
c) the low-voltage end of the voltmeter.
3.1.4.3 Connect the following devices together and insulate them from ground i) the commercial voltage end of the voltage generator:
b) the connecting column of the metal plate with a diameter of 300mm: c) the high-voltage end of the voltmeter.
3.1.5 Test procedure
a) In the absence of a sample, apply a 600V RMS voltage with a frequency of 50Hz between the high and low voltage devices of the measuring equipment, and read the voltage value at the output end of the electrode on the measuring instrument. This value is the reference voltage, represented by the symbol Ue. 6) Take out the electrode device, press the sample tightly under the electrode, and put it into the test device at the same time in the order described in 3.1.4.1, apply voltage, and read the voltage value at the output end of the electrode, represented by the symbol U. 3.1.6 Test results
Take the arithmetic average of the shielding efficiency of the three samples as the shielding efficiency of the clothing material. The shielding efficiency of shielding clothing materials must comply with the specified values of GB6568,1. Shielding efficiency is calculated by the following formula:
SE= 201g
Wherein SE-
Shielding efficiency dB:
Uret-base voltage (without shielding), V; U-voltage value after shielding, V.
3.1.7 Test report
The test report shall include the following contents:
a) Model, name, manufacturer and manufacturing date of the clothing material;
c) Shape, size and quantity of the sample;
c) Sample processing conditions;
d) Name, model and specification of the test equipment;
e) Test data and conclusions;
f) Test environment temperature and relative humidity;
|) Test date and test personnel.
3.2 Clothing resistance test
3.2.1 Main equipment
GB 6568.2—2000
a) A DC voltage and current stabilized power supply with an output voltage of 10V and a current of 2A;
b) A DC double-arm bridge with an accuracy of 0.2%;
c) A shaped four-terminal annular electrode, the four rings of which are assembled together with a 15mm thick organic glass disk, the bottom surface is processed into the same horizontal plane, and plated with 5 um thick gold. The total column height of the electrode is 53 mm, and the effective test surface is a ring surface with an inner diameter of 44 mm and an outer diameter of 114 mm. The electrode material is brass, with a self-weight of 2.8 kg and an additional weight of 20 kg (see Figure 2a for electrode dimensions and Figure 26 for electrode additional weight).
1-Central cylindrical electrode: 2.4, 5-Ring electrode, 3-Organic glass insulating board; 6Horizontal surface in contact with the sample, 7Set screw 8-Terminal
Figure 2a Clothing resistance measurement electrode
3.2.2 Sample
GB 6568. 2--2000
1, 2Additional weight block for cast iron material; 3-Organic glass insulating board Figure 2bAdditional weight block for clothing resistance measurement electrode 2
a) Cut a square sample of 240mm×240mm from the test cloth at least 50mm away from the edge of the cloth, a total of 3 pieces; b) The sampling method is the same as 3.1.2.1;
c) The treatment of the sample is the same as 3.1.2.3.
If it is old clothes in use, test at different parts of the clothes without cutting the sample. 3.2.3 Test conditions
The test should be carried out in an environment with a temperature of 23 (±2C and a relative humidity of 45% to 55%. 3.2.4 Test procedures
a) Connect the connecting wire between the double-arm bridge and the measuring electrode. The inner and outer circular electrodes are the current terminals, and the middle two circular electrodes are the voltage terminals;
b) Stretch the sample flat with an embroidery frame to minimize the wrinkles of the sample, and then place it on a smooth and flat insulating board with a 5 mm thick felt pad;
c) Place the measuring electrode on the sample to make good contact, and then press the additional weight of 20 kg on the electrode. At this time, the bridge indication value is the measured resistance value.
Test at 5 different positions on each sample, and a total of 15 data are measured for the three samples. 3.2.5 Test results
Remove the maximum and minimum readings from the 15 test data of the three samples, and take the arithmetic average of the 13 readings in the middle as the material resistance value.
GB 6568.2—2000
The material resistance value of shielding clothing must comply with the value specified in GB6568.1. 3.2.6 Test report
The test report should include the same content as 3.1.7. 3.3 Clothing fusing current test
3.3.1 Main equipment
a) An electrode support frame made of insulating material (see Figure 3, used to fix the test electrode and sample; b) Four test electrode plates made of 3mm thick brass plates, with two electrode plates at each end of the electrode support frame to form the test electrode. The size of each electrode plate is 20mm×90mm, and the contact area with the sample is 20mm×20mm. The surface of the electrode plate is required to be smooth and flat;
c) a large current generator with an output current of 0~100A; d) an AC regulated power supply with a capacity of 1kVA; e) an AC ammeter with a range of 0~100A; f) a stopwatch;
g) a windproof test cabinet, as shown in Figure 4a, and its dimensions are shown in Figure 4b. 190
1—Electrode 2—Insulating support frame
Figure 3 Clothing fusing current test device
Figure 4a Test cabinet appearance
3.3.2 Sample
GB6568.2--2000
One vent
Figure 4b Test cabinet processing diagram
a) Cut 3 rectangular samples of 200mm×25mm in the warp and weft directions at least 50mm away from the edge of the sample cloth, for a total of 6 pieces, and then accurately trim the edge yarn to a width of 20mm (tolerance is half a yarn); b) The sampling method is the same as 3.1.2.1;
c) The test treatment is the same as 3.1.2.3.
3.3.3 Sample Installation
Place the two ends of the sample between the two copper plates of the two test electrodes, and fix the two ends of the copper plates with bolts with a diameter of 10mm, as shown in Figure 3.
Place the electrode support frame with the installed sample in a windproof test cabinet, and the test cabinet is placed in an environment with a temperature of 23°C ± 2°C and a relative humidity of 45% to 55%.
3.3.4 Test Procedure
3.3.4.1 For the sample of type I clothing, first add a 3A test current, stay for 5 minutes, and then increase the test current in stages according to each level of 1A, stay for 5 minutes at each stage, until the sample is melted. Record the sample's melting current and melting time, and record the sample changes at each stage.
3.3.5 Test Results
GB 6568.2-2000
Take the arithmetic average of the melting currents of the 6 samples as the clothing melting current. The fusing current of the clothing material must comply with the value specified in GB6568.1. 3.3.6 Test report
The test report shall include the following contents:
a) Model, name, manufacturer and manufacturing date of the clothing material;
b) Shape, size and quantity of the sample;wwW.bzxz.Net
c) Processing conditions of the sample;
d) Name, model and specification of the test equipment;
e) Changes in the sample, test data and conclusions;
f) Test environment temperature and relative humidity;
g) Test date and tester.
3.4 Spark resistance test
3.4.1 Main equipment
a) A 76-1 type spark vacuum detector, with an operating voltage of 220V ± 20V, a power frequency of 50Hz, an output power of no more than 60W, and a flame length of no less than 25mm;
b) A disc-shaped plate electrode with a diameter of 140mm;
c) A stopwatch.
3.4.2 Samples
a) Cut square samples of 180mm×180mm from the sample cloth at least 50mm away from the cloth edge, a total of 3 pieces; b) The sampling method is the same as 3.1.2.1;
c) The sample processing is the same as 3.1.2.3.
3.4.3 Test procedures
a) Place the sample on the disc-shaped flat electrode and fix it so that the sample is flat and stretched without wrinkles, and the disc-shaped flat electrode is grounded; b) Place the emitter of the electric spark vacuum detector at a position perpendicular to the flat electrode, and the distance between the sample and the electric spark emitter nozzle is 6mm±1mm;
c) Start the electric spark vacuum detector and start timing. Stop the electric spark after 2 minutes, record the changes in the sample and measure the carbonization damage area.
Test 5 points on each sample, and a total of 15 points on the 3 samples. It is necessary to ensure that the arc burning part is more than 20 mm away from the edge of the sample, and the interval between each point is more than 40 mm.
3.4.4 Test results
a) The sample should not have open flames spread under the action of electric sparks, only carbonization; b) The arithmetic mean of the carbonization damage area of 15 test points is taken to characterize the spark resistance performance of the clothing material, the unit is square millimeter. The spark resistance performance of clothing materials must comply with the provisions of GB6568.1; c) Test data processing.
The maximum relative error allowed is not more than 20% of the average value. The maximum relative error is expressed as a percentage and calculated as follows: Maximum relative error = | Maximum value (or dust signal) average value | × 100% average value
When the calculation result exceeds the allowable relative error, remove the observation value with the largest error, and then calculate the remaining observation values again according to the above formula until it meets the requirements. The number of discarded observation values shall not exceed 40% of the test points, otherwise the sample test should be re-taken. 3.4.5 Test report
The contents of the test report shall be the same as those in 3.3.6. 3.5 Flame retardant test
3.5.1 Main equipment
3.5.1.1 Test cabinet
GB6568.2--2000
The test cabinet consists of 1.The cabinet is made of 5mm thick steel plate, and the inner wall of the cabinet is painted black. The structure of the test cabinet is shown in Figure 4a and Figure 4b: a) The front and back sides of the cabinet are composed of two steel plates, each with a vent hole of 116mm×440 mm (height×length); b) A glass door is installed on the upper part of the vent hole of the steel plate in the front of the cabinet for entry and exit and observation; c) There is a hole with a diameter of 200mm on the top plate of the cabinet, and a steel plate with a size of 300mm×300mm is erected above this hole to form a baffle;
d) A pair of vertically fixed sample fixtures are installed in the test cabinet, and the lower end of the fixture is about 110mm away from the bottom of the cabinet. 3.5.1.2 Specimen clamp
The specimen clamp is used to clamp the specimen during the test. It consists of two parts, as shown in Figure 5: a) a clamp support\1, on which two metal bars\2" with a thickness of 5mm and a distance of 150mm are fixed; b) two movable metal bars "3" with a thickness of 5mm, fixed to the metal bar "2" with calipers or steel clamps. The specimen is clamped between the bars "2" and "3" to achieve the purpose of hanging the specimen well. 3.5.1.3 Accessories
a) Standard ignition cloth sample, whose composition is 65% Polyester, 35% cotton yarn, weight per unit area is about 110g/m2, unbleached and unfinished plain polyester cotton yarn fabric;
b) Two calipers or steel clamps;
c) A stopwatch,
d) A reflector with a size of 600mm×350mm, which is placed on the back wall of the test cabinet to observe the burning situation on the back of the sample.
1-Clamp support; 2 Fixed rod; 3·Moving rod; 4·Sample Figure 5 Sample clamp
3.5.2 Sample
GB 6568. 2-2000
a) Cut 3 rectangular specimens of 300mm×190mm in the warp and weft directions at least 50mm away from the edge of the test fabric, for a total of 6 pieces. After the specimen is fixed to the specimen fixture, its test area is 300mm×150mm; b) The sampling method is the same as 3.1.2.1;
c) The handling of the specimen is the same as 3.1.2.3.
3.5.3 Test procedure
3.5.3.1 Prepare standard ignition fabric sample
a) Cut a polyester cotton yarn strip of 80mmX25mm in size, with its length direction consistent with the warp direction; b) Fold the polyester cotton yarn strip into a rectangle of 20mm×25mm in the length direction, with the two ends inside. 3.5. 3.2 Clamp the standard ignition fabric sample
As shown in Figure 6, clamp the standard push ignition fabric sample in the middle of the lower end of the sample, fix the clamp horizontally, make the standard ignition fabric sample have two layers on the front and back sides of the sample, and make the end of the standard ignition fabric sample 10mm lower than the lower end of the sample. 2020
Figure 6 Standard ignition fabric sample installation diagram
3.5.3.3 Flame retardant test
First fix the sample on the sample fixture vertically hung in the test cabinet, so that its lower end is on the same horizontal line as the lower end of the fixture, and the distance between the standard ignition fabric sample and the two vertical rods of the fixture must be the same; then strike a match and ignite the middle of the lower end of the standard ignition fabric sample (ignition time is 2s), immediately start the stopwatch and close the glass door of the test cabinet; the standard ignition fabric sample burns normally for 25 s～~30s, observe the combustion of the sample during the test and record the following results: a) smoke;
b) deformation;
c) melting;
d) when the open flame on the sample disappears, record the open flame burning time; e) when the residual afterglow on the sample is extinguished, record the sample smoldering time; f) remove the sample, place it in an environment with a temperature of 23℃±2℃ and a relative humidity of 45%~55% for 15 minutes, and then measure the height of the cone-shaped burnt part, which is the charcoal length; g) measure the burnt area: cut off the burnt or melted part with scissors, and then place the sample on the sample to keep its shape and the sample, trace the burnt part on the grid calculation drawing paper, and measure the area of the burnt part using the conversion method or the geometric area measurement method. 3.5.4 Test results
The six samples taken for the test must meet the following conditions: a) The burnt area of the sample should meet the value specified in GB6568.1; b) The burnt surface of the sample does not spread to the vertical part of the sample fixture, nor does it spread to the upper edge of the sample, that is, the carbon length of the sample should meet the value specified in GB6568.1.
3.5.5 Test report
The test report should include the same content as 3.3.6. 3.6 Washing resistance test5 Test report
The contents of the test report shall be the same as those in 3.3.6. 3.6 Washing resistance test5 Test report
The contents of the test report shall be the same as those in 3.3.6. 3.6 Washing resistance test
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