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Mechanical Industry Standard of the People's Republic of China
JB/T 6302-1992
Pressure Thermometer for Transformer
Published on June 26, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Pressure Thermometer for Transformer
Subject Content and Scope of Application
JB/T 6302-1992
This standard specifies the terminology, model specifications, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of pressure thermometers for transformers (hereinafter referred to as thermometers). This standard applies to pressure thermometers for oil-immersed power transformers, oil-immersed special transformers and oil-immersed reactors. Reference standards
ZBY002
ZBY123
GB6451
Terms and terms
3.1 Thermometers
Packaging, storage and transportation, graphic symbols
Basic environmental conditions and test methods for transportation and storage of instruments and meters. General provisions for scale division of industrial automation instruments. Technical parameters and requirements for three-phase oil-immersed power transformers. A temperature meter dedicated to transformers. It displays the top oil temperature of the transformer through the pressure change of the temperature-sensing medium, and has electrical contacts to control the transformer cooling system and send out alarm signals. 3.2 Composite sensor
The temperature bulb of the thermometer and the resistance thermometer (division number Pt10) are combined in the temperature sensing element of the Φ14×150mm sensor. 4
Basic parameters and model definition
4.1 Measuring range: 0~120℃
4.2 Maximum indication error: ±1.8C (full range). 4.3
Temperature package size: Φ14×150.
Composite sensor size: Φ14×150m (temperature package and Pt100 platinum resistor composite). Mounting thread: M2.7×2.
Maximum temperature pointer mechanism with manual reset. 1P55 dustproof and water sprayproof (case installation dimensions should comply with Appendix A). 2~4 temperature switches (full range setting). Capillary tail length is not less than 4.0.
Model definition
Approved by the Ministry of Machinery and Electronics Industry on June 26, 1992, and implemented on January 1, 1993
Technical requirements
JB/T 63021992
General protection not indicated
(TH) indicates humid tropical zone protection
(TA) indicates dry tropical zone protection
(T) indicates combined wet and dry heat protection
Not indicated for non-composite sensor
A indicates with Pt100 platinum resistance
Indicates the number of temperature switches
Two digits indicate linear scale (such as)
0 indicates non-linear scale
Pressure type
Thermometer
Transformer
Thermometers should comply with the provisions of this standard and be manufactured according to the drawings and design documents approved in the prescribed procedures. 5.1
Normal working environment temperature and relative humidity
Ambient temperature: -30~+55℃
Relative astringency: 59%~95%
Note: According to user requirements, thermometers with other working environment temperatures and relative humidity can be produced. 5.3 Basic error limit of indication
The basic error limit of indication of the thermometer should be less than ±1.B℃. 5.4 Hysteresis of indication
The hysteresis of indication of the thermometer should be less than 1.8℃. 5.5 Repeatability of indication
The repeatability of indication of the thermometer should be less than 1.1℃. Switch action error limit
The switch action error limit of the thermometer should be ±3℃ (factory setting value K,=55℃, K,=0℃). 5.7
Switch switching difference
The switch switching difference of the thermometer should be 6±2℃. 5.9 Effect of ambient temperature
When the working environment changes from any temperature within 20±2°C to any temperature specified in Article 5.2, the change in the indication of the thermometer shall not exceed ±0.03/°C (percent of the full range). 5.9 Time constant
The time constant of the thermometer shall be less than 3BS.
5.10 Overrange
The thermometer shall be able to withstand an overrange test of not less than 5in and 132°C. 5.11 Long-term operating performance of temperature switch
The contact capacity of the temperature switch of the thermometer shall meet the requirements of GB6451. Under the rated load, its electrical contacts shall be able to withstand 15,000 closing and opening tests, and the switch shall operate normally after the test.
5.12 Pointer and scale
JB/T 6302—1992
The pointer of the thermometer shall deflect in the clockwise direction as the temperature rises. 5.12.1
The scale of the thermometer shall comply with the provisions of ZBY123. The height between the indicating part of the thermometer pointer and the surface of the dial shall be within the range of 1 to 3m. 5.13 Withstand pressure
The temperature bulb of the thermometer shall be able to withstand the withstand pressure test of 1.0MP and 1m1n without damage or leakage. 5.14 Capillary and temperature bulb
The temperature bulb and capillary shall have protective coating. The temperature bulb or protective tube is recommended to be made of stainless steel to avoid external chemical corrosion and mechanical damage.
3.15 Insulation resistance
When the ambient temperature is 15 to 25℃ and the relative decay is 1596 to 759%, the insulation resistance between the switch and the grounding terminal of the thermometer shall not be less than 20%2.
5.16 Dielectric Strength
Under the same environmental conditions as in Article 5.15, the switch and ground terminals of the thermometer shall be able to withstand a dielectric strength test with a frequency of 50Hz, an AC voltage of 2008V, and a duration of 1in without breakdown or flashover. 5.17 Appearance
5.17.1 The glass or other transparent materials on the surface of the thermometer shall remain transparent and shall not have defects that prevent correct reading. 5.17.2 The protective layer of each component of the thermometer shall be firm, uniform and smooth, and shall not have rust or delamination. 5.i8 Continuous Impact
The thermometer in factory packaging shall be able to withstand 1000 continuous impact tests with an acceleration of 98n/s and a pulse duration of 11ms. 5.19
Outdoor Performance
The waterproof and dustproof facilities of the thermometer shall be able to meet the IP55 protection level. 3.2.0 High and low temperature storage
Thermometers packed according to factory requirements shall be able to withstand 8h high and low temperature storage tests at +55C and -40℃. Anti-vibration performance
The thermometer is tested for 1h at a frequency of 100Hz and an amplitude of 0.2mm. The half amplitude of the pointer swing affected by vibration shall not be greater than 1.u℃. Long-term stability
After the thermometer works continuously for 1000h, it shall still meet the requirements of Articles 5.3 and 5.4. 5.2.3 The thermometer shall be able to withstand a heat-avoidance test with a working environment temperature of 40±2℃ and a relative condensation of 90%~96%6 for 48h. After the test, its basic error limit of indication, hysteresis and appearance shall still meet the requirements of Articles 5.3, 5.4 and 5.17. Test and test method
Indication basic error limit test
Test conditions:
The thermometer head should be installed vertically;
The temperature package should be completely submerged:
C, the height difference between the head and the temperature package should not be greater than 1m: d. The ambient temperature is 20±2℃:
e. No vibration and perturbation.
6.1.2 The test equipment is a constant temperature bath (ice point bath, water bath, oil bath), standard instrument, etc. 6.1.3 Temperature inspection points
The temperature inspection points of the thermometer are at least 0℃C, 40℃, 80℃, and 120℃. 6.1.4 Test method
JB/T6302—1992
Insert the thermometer to be tested and the standard thermometer in a constant temperature chamber. After the constant temperature precision temperature is stable for at least 1 minute, read the value of the thermometer to be tested by the standard leak meter, and then read the indication of the thermometer to be tested.
The difference between the indications of the standard thermometer and the thermometer to be tested is the basic error limit of the indication of the thermometer at the test point. The basic error limit should be tested once at each temperature test point according to the forward and reverse strokes, and the results of each test at each temperature test point should comply with the provisions of Article 5.3.
Note: The upper and lower limits of the thermometer are only tested for single stroke. 6.2 Indication hysteresis test
The inspection of the indication hysteresis adopts the same inspection conditions, test equipment, standard instruments, temperature inspection points (except for the upper and lower limits) and methods as the indication error limit inspection and is carried out at the same time as the indication basic error limit inspection. The difference between the positive and negative strokes of the tested thermometer at each inspection point is calculated: the indication hysteresis), which shall comply with the provisions of Article 5.4. 6.31 Value selection test
: Repeatability test adopts the same test conditions, test equipment, standard instruments and test points as those for the basic error limit of indication. At each temperature test point, the thermometer shall indicate at least three times in the same stroke (positive or negative stroke). The maximum difference between the same line and the indications at each temperature point is the repeatability of the thermometer, which shall comply with the provisions of Article 5.5. 6.4 Switch action error and switch switching difference test 6.4.1 When testing the switch action, except for the signal circuit and temperature test points, the same test conditions, test equipment and standard instruments as those for the basic error limit of indication test shall be adopted.
The thermometer shall be tested for switch action error and switching difference at 55℃ and 80C. 6.4.2 Insert the tested thermometer and the standard thermometer into the constant temperature bath, connect the tested inductor to the signal circuit, and then evenly change the temperature of the temperature bath (the temperature change rate should not be greater than 1C/in), so that the switch produces a switching action of closing or opening (the signal circuit is connected or disconnected). At the moment of action, the reading of the standard thermometer is the upper switching value or lower switching value of the switch forward or reverse stroke. At the same temperature inspection point, the difference between the temperature indicated by the set pointer of the thermometer under test (inspection point or set point) and the temperature when the switch is closed is the switch action error. The difference between the upper switching value and the lower switching value is the switch switching difference. 6.5 Test of environmental temperature influence
Put the thermometer head and capillary tube into a constant temperature box, and gradually increase and decrease the temperature to the working environment temperature specified in Article 5.2, which shall meet the requirements of Article 5.8. The indication inspection shall compare the indication before and after the working environment temperature changes at the same temperature inspection point and the same stroke. There shall be no less than three temperature inspection points (the upper and lower limits of the measurement and the long scale line in the middle), and the indication shall be the arithmetic mean of no less than three readings.
Time constant test
Move the thermometer with stable indication inserted in the 90C constant temperature bath quickly into the room temperature water bath, and start the stopwatch immediately. When the change in the thermometer indication is equal to 639% of the temperature difference between the two baths, stop the stopwatch. The time recorded by the stopwatch is the time constant. 6.7 Over-range test
After the thermometer is subjected to the over-range test specified in Article 5.10, it should still meet the requirements of Articles 5.3 and 5.4. 6.8 Switch long-term operation performance test
For the switch long-term operation performance test, use a cam mechanism to reciprocate and push the switch to close and open at a frequency of 10 in. After the test number reaches 15,000 times, it meets the requirements of Article 5.11.
6.9 Appearance inspection
Inspect by visual inspection according to the requirements of Article 5.17. 6.10
Shrinkage resistance test
The insulation strength test shall be carried out with a megohmmeter of 500V DC in accordance with the provisions of Article 5.15. 6.11
Insulation strength test
The insulation strength test shall be carried out on a high-voltage test device with a power of not less than 250VA on the high-voltage side in accordance with the provisions of Article 5.16. 4
6.12 Continuous impact test
JB/T 6302—1992
The thermometer shall be packed into a transport box according to the transportation requirements. The box shall be fastened to the continuous impact test bench directly or through a transition structure with a belt. The transition structure shall have sufficient dimensions to avoid causing additional spectral absorption. Then the box shall be subjected to the following conditions. Pulse waveform: Approximately half-sine liquid
Acceleration: 98m/s
Pulse duration: 11±2ms
Pulse repetition rate: 60~100 times/nin
Continuous impact times: 1000±10 times
After the test, take the thermometer out of the packaging box, carefully check whether the thermometer is damaged and check the basic error limit of the thermometer's indication, hysteresis, switch action error and switching difference, and they should meet the corresponding requirements. 6.13 Waterproof and dustproof performance test
6.13.1 Use a standard nozzle with an inner diameter of 6.3 to spray the meter in any direction. The water pressure of the nozzle is 30kPa: the flow rate is 12.5±0.625L/min. The distance between the nozzle and the outer surface of the meter is about 3m; after the spraying duration is 3ein, the insulation resistance should be no less than 2M0. 6.13.2 Put the thermometer into an appropriate sealed box. The box contains talcum powder, which should be filtered through a metal mesh with a mesh size of 75um×75um and a mesh diameter of 50u. The amount of talcum powder is 2kg/. Blow air into the box to suspend the talcum powder for 8 hours, then take out the thermometer and repeat the test in Article 6.1 to meet the requirements.
6.14 High and low temperature storage testbZxz.net
The purpose of this test is to determine the impact of high and low temperatures that the thermometer may suffer during transportation on the performance of the thermometer. The thermometer is placed in a high temperature box under simple packaging conditions and maintained at Bl at a temperature of 55±2℃. Then the thermometer is placed under the corresponding inspection conditions for at least 24 hours. The basic error limit of the thermometer's indication, hysteresis, switch action error and switching difference are measured, which should meet the corresponding regulations. Then put the thermometer in a low temperature box and repeat the above test at a temperature of -40±2℃. 6.15 Vibration test
Fix the thermometer on the vibration table and put it in the normal installation state. The up and down direction of the thermometer when it is installed is defined as the up and down direction of the vibration test. The perturbation waveform of the vibration test machine is a positive wave, and the test sensor is installed on the thermometer fixing plate. According to the conditions specified in Article 5.21, the test is carried out in three directions: up and down, left and right, and front and back. The test results shall comply with the provisions of Article 5.21.
6.16 Stability test
The thermometer shall first withstand a 24h, 120℃ test, and after the test, it shall comply with the requirements of Articles 5.3 and 5.4. Then, after continuing to work for 1000h under the condition that the occurrence rate of the alternating measurement temperature greater than B0℃ is not less than 50%, it shall still comply with the requirements of Articles 5.3, 5.4, and 5.8. The alternating measurement temperature shall be changed at least once a day. 6.17 Humidity test
The thermometer should be placed under the corresponding test conditions for 24 hours, and its indication basic error limit and hysteresis should be measured. Then put the thermometer into the damp heat test chamber, make the temperature of the test chamber 40±2℃C and the relative humidity 9096～969%6, and keep it for 48 hours. Take the thermometer out of the test chamber and place it under the corresponding test conditions for no less than 24 hours, check its appearance and re-measure its indication basic error limit and hysteresis. Move to the environment temperature of 15~35C and the relative humidity of 45%～75% within 10 minutes, and complete the insulation resistance and insulation strength test of the thermometer within 30 minutes. The insulation resistance of the thermometer should be no less than 2MQ: The test voltage of the insulation strength test is 1500V. 7 Inspection rules
7.1 Factory inspection
Each thermometer shall be subject to factory inspection. The factory inspection items and inspection sequence are as follows: a. Appearance inspection; b. Insulation resistance; c. Insulation strength; d. Basic error limit of indication; c. Hysteresis of indication; f. Repeatability of indication; d. Switch action error; h. Switch cutting error.
JB/T 63021992
Type test
In addition to the factory inspection items, the type test of the thermometer shall also include the following test items in the following sequence: a. Ambient temperature influence;
Time constant
Over range;
d.Long-term operation performance of switch
e.Continuous impact
f, waterproof and dustproof
High and low temperature storage
Anti-inhibition performance;
L.Long-term stability:
j.Immersion.
Type test shall be carried out at least once every three years.
Marking, packaging, transportation and storage
The dial and nameplate of the thermometer should have the following markings: a
Manufacturer name:
Thermometer model and name:
Measurement unit symbol and measurement product production license approval code; c.
d, accuracy level:
Ground terminal mark:
f, switch rated power:
, switch maximum operating voltage, AC or DC maximum operating current; h, product number and manufacturing date.
Packaging marking
The outer surface marking of the product packaging should comply with the provisions of GB191. Packaging
Put the packing list, installation and operation manual, product certificate and other random documents into a plastic bag and package them together with the product, and there should be shockproof and anti-trace measures.
8.4 Storage
Basic environmental conditions and test methods for thermometer transportation and storage shall comply with the provisions of ZBY02 standard. 6
Additional instructions:
JB/T6302-1992
Xie Lu A
Installation dimensions
(Supplement)
This standard was proposed and managed by Shenyang Transformer Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shenyang Transformer Research Institute. The main drafter of this standard was Lu Wanlie.
10F012
People's Republic of China
Mechanical Industry Standard
Pressure Thermometer for Transformer
JB/T 63021992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Number of words XXX,XXX
Format 880×1230
Sheet X/X
Edition X, XX, 19XX
Printing X, XX, 19XX
Number of copies 1-XXX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_9
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