Some standard content:
Verification Regulation of Insulation Resistance Meter (Mgohmmeter) JIG 622—1997
Verification Regulation of Insulation Resistance Meter [Mgohmmeter]
Verification Regulation of Megohmumeter JIG 622—1997
Replaces J.NG622—1999
Not approved by the State Administration of Employment and Technical Supervision on November 24, 1991, and effective from May 1, 1996. Responsible unit: National High Voltage Meter Station
Lifting Unit: National Commercial Voltage Meter Station
The drafting unit is responsible for interpreting the technical provisions of the regulations. This regulation is mainly drafted by: Shou Shengjie (National Commercial Voltage Metering Station) Huang Weimin (National Commercial Voltage Metering Station) Participants: Shuo Guan (National Commercial Voltage Metering Station) 668 Technical requirements Verification tasks Verification methods Verification result processing and verification period 1 Insulation resistance meter Principle Wiring
Appendix Determination of the Measurement Standard of Insulation Resistance Meter Appendix 3 Technical Specifications
Requirements 4 Insulation Resistance Meter When the Transmission Current is Larger than 10mA or the Running Current is Larger (with a Current Value of 10mA)
Verification Procedure for Insulation Resistance Meter [Megaohm Meter] This procedure is only applicable to the verification of insulation resistance meters (including new, used and insulated resistance meters) for measuring insulation resistance. It does not apply to insulation resistance meters with different specifications and special uses whose technical requirements are different from those specified in a regulation. ］Han Song
1 Specifications
1.1 Nanoohmmeter is divided into 5 categories according to rated voltage: 50, 100, 250, 500, 1000, 2000, 2300, 500010000
1.2 Insulation resistance meter is divided into 5 grades according to accuracy: 1.0, 2.0, 5.0, 10.0, 20.0. 1.3 The vertical test temperature of the calibration environment of insulation resistance meter is 23T1.4 The schematic diagram of insulation resistance meter is shown in Figure 1. Its main components or parts are DC power supply device and indicating instrument: 1.4.1 DC power supply device can be divided into:
a. Built-in hand-cranked generator:
5, chemical power source (as shown below):
C. Device coordinated with AC power grid and rectifier circuit. 1.4.2 The indicating meter is divided into:
vehicle current meter and magnetoelectric ratio meter,
2. Technical requirements
2. Basic error
2.1 The basic error of the insulation resistance meter is calculated by formula (1). In the scale range (effective range), the basic error recording limit value of each selected scale shall not exceed the provisions of Table 1, iBr-Be1x 100%
In the formula 3P insulation resistance meter indication nominal value; 3 standard voltage resistance box indication value;
Reference value:
2.2 The reference value of the insulation resistance meter with dual non-linear scale is specified as the measurement indication value 2.3 The measurement of the insulation resistance meter with non-linear scale is divided into sections (1,, as shown in Figure 1. (1)
2.1 The length of the Ⅱ section is determined by the manufacturer, but shall not be less than T
B1 electric meter range section
D scale is 50% of the current: the section is from the starting point to the starting point of the section, the section is the maximum effective range point of the section warning point.
2.5 section is the standard, I and Wen Yi
are the low and correct areas. Table 】 is the relationship between the accuracy of the insulation resistance meter and the difference between the values of the insulation resistance and the equivalent value of the insulation resistance
Permitted resistance (No.
1.1 Section
Fortunately
The insulation resistance of the insulation resistance meter between the milk circuit and the outside is under standard conditions. When the rated voltage is small or equal to 1kV, the lower is higher than 20M1. When the wind is positive and the element is 1V, it should be higher than 30V. The insulation resistance meter should be tilted 5° in either direction. The change is not caused by the benzene process. 0% of the limit value of this error board,
5 terminal main circuit and its running quality
5.1 The voltage of the terminal group is called the opening voltage when the wire insulation meter is in the factory circuit, and it should be within %-111% of the rated voltage. 5.2 The peak value of the open circuit voltage of the terminal insulation meter shall not be greater than 1.5.5.3 When the resistance of the terminal group measured by the ohmmeter is equal to the middle resistance, the terminal group voltage is called the median voltage, and the median voltage should not be lower than 90% of the rated voltage of the comprehensive resistance meter. 5.4 The difference between the minimum indication value of the insulation resistance in the open circuit voltage recording value within 1min should not be greater than 5% of the rated voltage value of the insulation resistance meter.
6 Insulation strength
6.1 The insulation resistance meter with the power supply from the free-flow grid: The insulation between the power supply circuit and the multi-shell should be able to withstand the voltage of 2k alternating current for a period of 2m
6.2 The maximum output current of the insulation meter is 10mA (DC or pulsating current peak value, below the skin, the measurement circuit and the external circuit can withstand the frequency of 50Hz: the drop coefficient shall not exceed 5%, the air filter voltage is positive for 1min. The test voltage is shown in Table 2, and the test equipment capacity is shown in Table 3. Table 2
Real Hall
>530·-2500
Select the voltage / (effective position , kV)
Environmental protection, 5·40):
Specification:%
>3530--10000
, maximum insulation value;
an insulation resistance is measured by the ratio of the terminal position of the meter to the frequency stop position k
test device rate measurement VA
6.3 Insulation resistance when the output current is greater than 104 DC or peptide current peak value): its test voltage 6738-19%6 Item 6.5.3 (Appendix 4 of the regulations)
For insulation resistance meters with a maximum measurement limit of 50M or more, there shall be a shielding device to prevent the influence of leakage current on the circuit. When the terminal and the tail plate terminal are connected, the shielding terminal shall be twisted slightly and the shielding terminal shall be twisted to the maximum. When the resistance of each connection is equal to the good resistance value of the insulation resistance meter measurement area, the meter shall meet its standard level.
Test environment conditions
Three test conditions
8.1 The test temperature of the insulation resistance meter is (=5). The relative humidity is small. 8.2 The temperature of the instrument and accessories shall be the same as that of the surrounding air source. 8.3 The test site shall have no other strong external communication except the cell site. B, 4 The power supply voltage is sufficient for deviation! 5%: allowable deviation of the rule -1%: 9 Calibration equipment includes: standard high-voltage high-voltage box, phase-converter drive device, rectifier, capacitor, voltmeter and AC test device. The relevant technical requirements are retained in the specified method. 10 All calibration instruments should be equipped with valid calibration certificates. 11 The effective calibrated meter can work normally and the parts are complete. IV. Calibration items
12 Calibration items of the calibrated meter are shown in Table 4, Table 4
Calibration measurement items
Scientific inspection
Step test
Also improve the efficiency of the calibrated meter
Increase the power collection and its reason Qualitative measurement
Complete sound inspection
After the test
During the regular test, the "peak voltage and effective value" in 5.1 shall not be checked; during the product symptom test, the product symptom test shall not be checked. L3 Appearance inspection
13.1 The meter components shall not have the necessary signs to ensure the correct use of the meter. Regular test
13.2 From the outside, the parts are complete, without looseness, cracks, obvious damage or contamination. When the meter is tilted or gently touched, the internal parts are particularly damaged.
1 3.3 For the insulation resistance of the mechanical device, when the mechanical device is rotated to the left and right, the indicator should rotate symmetrically, the needle should not be bent, and the distance from the surface of the scale plate should be appropriate. 14 Steps of acid test
14.1 First, when the insulation resistance limit meter is open, switch on the power supply or shake the generator, the pointer should point to the position, and it should not deviate from the center of the scale line! 1. If the manual has a large adjustment knob, it can be adjusted to the scale line, and H is more than 672
.
14.2 Short the insulation resistance meter line and the grounding terminal, and the indicator should be It should point to the military graduation line and should not deviate from the center position of the scale line + 1m
14.3 For the absolute resistance meter with zero graduation line, it should be connected to the starting point for inspection. 15 Basic error determination
15.1 Basic conditions for verification
15.1.1 The manual speed should be within the range of 120-/min (or 150r/min) of the rated speed. 5.1.2 The wires should have good insulation, and can be connected by other wires or by front pressure. 15.1, 3-position equipment includes standard high-voltage high-resistance and rated speed drive devices, 15.1.4 The allowable error value of the standard high-voltage high-resistance box shall not exceed 1/4 of the allowable error limit of the insulation resistance meter. The accuracy of the insulation meter and the accuracy of the standard high-resistance box used are shown in Table 5. Measurement 5
Standard high-resistance meter (102)
Item Standard high-resistance meter (102)
15.1.5 The adjustment accuracy of the standard high-voltage high-resistance box shall be less than the multiplication of the scale indication value of the insulation resistance meter under test and 2/200. 4 The grade index of the insulation under test: 15.1.6 The standard high-voltage high-resistance box has a separate explosion-proof shielding terminal and a grounding terminal. When the standard high-voltage high-resistance box is measured with an ohmmeter: there shall be no obvious unregulated, short-circuited or open-circuited image.
15.1.7 When the insulation resistance meter is tested for basic error, in addition to the standard voltage resistance box, the value of the resistor that meets the requirements of the calibration reference conditions can also be changed or compensated.
High Voltage R
Benefit Control Standard Monitoring
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Figure 2 Basic Error Test Connection of Insulation Resistance Meter
15.1.8 When the insulation resistance meter is tested at a fixed voltage, when the fixed voltage changes by 10%, the error of the insulation resistance meter shall not exceed 1/3 of the error limit. 15.2 When the insulation resistance meter is tested for basic error, the total uncertainty of the test caused by the standard voltage resistance box, the test auxiliary equipment and the environmental conditions shall not exceed 1/3 of the allowable error limit of the insulation resistance meter. Determination of basic error Under the standard high voltage commercial class, each digital transformer shall be inspected one by one (according to the national 2 connection). 15.3 Requirements All transformers on the working part of the scale shall meet the requirements of Table 1. 15.4 Error calculation According to formula [1], the error calculation is carried out. 16 Terminal voltage and common displacement qualitative measurement 16.1 Measurement drop and component parameters See Figure 3. 16.2 Measurement of terminal voltage The voltage of the terminal plate of the terminal of the voltage meter is 1, E, and the speed of the hand-cranked generator is within 120 +/min (or 10 + red/min). The voltmeter can use an electrostatic positive meter, or a positive meter with an auxiliary seat not less than 20 digits of the value of the insulation voltage meter being tested. Its accuracy is not less than 5.5 73. |tt||16.3 When the insulated ammeter is in the open state, the peak position of the terminal voltage is measured, and the effective value is measured as shown in Figure 3:
16.4 When the insulated resistance meter is connected to the middle value group, the terminal voltage is measured, and the middle value resistance value of the two devices in parallel is measured in Figure 3.
16.5 The rated voltage of the insulated ammeter should be measured with the peak position of the measuring circuit in the meter: D is matched with the rated voltage, and the reverse side of the scale is less than the rated voltage of the rated voltage, which is the same as that of Section 16.2. 15 times; ℃ capacitor, the voltage it can withstand is not less than 1.5 of the rated voltage of the meter, and the monthly tolerance is not less than U., nor is it greater than 0.5-F. 17.1 Place the meter in the marked position. The capacitance is greater than the detection limit 17.2 Under the reference conditions, measure the voltage limit in the section [V:-V voltmeter, indicate the effective voltage; V--the upper limit of the electrical measurement range, and the detection is carried out on the three-degree line within the limit, indicating the voltage peak.
Measure and record the actual resistance of each scale line (Bs). 17.3 The voltmeter is tilted forward by 5°. If there is a mechanical adjuster, adjust the zero position. Perform the test according to Section 17.2 and record the actual resistance of each scale line (H).
17.4 The voltmeter is tilted backward by 5°. If there is a mechanical adjuster, adjust the zero position. Perform the test according to Section 17.2 and record the actual resistance of each scale line (Bx
17.5 Only for table The table is tilted 5° to the left, and the mechanical zero adjuster should be adjusted to the zero position. According to Section 17.2, the actual pulse resistance (B) of each division is recorded. The table is tilted 5° to the right, and the mechanical zero readout device should be adjusted to the zero position. According to Section 17.2, the actual resistance of each division line is recorded (2). For each selected division line, the absolute value of the variable expressed in percentage due to the position should be the maximum deviation of the measured values of Sections 17.2 and 17.3, 17.4, 17.5, and 17.6, calculated as follows: B = B × 100%: Bs-Bw
×100%Fx=
Fy- I Es~ Ev
×10%E2-
In the formula, the basic value of A can be found in Section 2.2
1Day insulation capacity
BB×100%
18.1 When measuring the insulation resistance of the insulation resistance meter under test, the rated voltage of the selected insulation resistance meter shall be consistent with the voltage level of the tested insulation resistance meter, but shall not exceed 500V. 8.2 The accuracy of the selected insulation resistance meter shall be equal to the accuracy grade of the manufacturer's insulation resistance meter. 18.3 For the selected and tested insulation resistance meter, if it is other than an insulation resistance meter, the manufacturer's regulations shall be followed and the rated voltage shall be within the marked "operating range": if the power supply is from the power grid, the voltage fluctuation shall be within 5%. 1B.4 Short-circuit the "L, E, G" terminals of the insulation resistance meter and use a certified insulation resistance meter to measure the insulation resistance between the short-circuit point of the "L, E, G" of the insulation resistance meter under test and the metal part of the shell. The results obtained shall meet the requirements of Section 3. 19 Insulation resistance test number 1. When conducting the insulation resistance test between the power supply circuit and the external device, all parts of the circuit shall be disconnected from the shell. The insulation resistance test between the reverse current circuit and the external device shall be conducted. When the power supply circuit is connected to the must-have, 674
19.2 The test voltage is step 3 and is not affected (the distortion coefficient does not exceed: 5%). 19.3 The test voltage should rise steadily to the set value in Table 2. No obvious transient phenomenon should occur at this stage: keep ltnin, and then drop steadily to zero.
19.1 When applying the ratio voltage test, there is no abnormal sound, the self-current suddenly increases, and no breakdown or arcing occurs. The insulation resistance meter passes the insulation validity test 20 sequence installation inspection
20.1 When checking the shielding pipe, connect according to Figure 4, and connect a resistor between the H terminal and the screen terminal and between the line terminal L and the shielding terminal respectively. The insulation resistance meter current loop series resistance is 10 times the resistance scale: "see Appendix 1) Resistance value, in the section measurement range, the upper and lower attached and median three-point waste line detection: record the actual voltage of each distribution ().
20.2 Calculate according to the public station (3):
The formula should meet the requirements of Table 1,
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21 For each range of the multi-volume light insulation resistance meter, all sections 14 to 20 are determined. VI. Processing of calibration results and calibration intervals
22 The calibration certificate does not have calibration data. The calibration data should be recorded in the original calibration record and retained for at least [years]. 23 Find the maximum difference between the indication of the test point of the paint positive meter and the actual original value measured, Calculate according to Article 2, and the result is the maximum basic error of the insulation resistance meter in the section. 2 The calculated data of the maximum basic error of the insulation resistance meter shall be revised according to the specification, and the revision interval is 1 of the allowable error limit. The data after the revision shall be used as the basis for judging whether the insulation resistance meter exceeds the allowable error limit. 2 When the insulation resistance meter under inspection meets the requirements of the technical specifications, the meter is qualified, otherwise it is unqualified.
26 The insulation resistance meter that is qualified shall be issued a correction letter; the insulation resistance meter that is unqualified shall be issued a verification result notification letter, stating the reasons for the unqualified. If the basic error is poor, but it can meet the technical requirements of the first level, it shall be used as a bag. 27 The insulation resistance meter shall be marked with a verification mark after registration. 28 The verification cycle of the insulation resistance meter shall not exceed 2 years. 675
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It is a small electrical measuring instrument for measuring insulation resistance. Its single terminal pin is connected to the wiring terminal of the object to be measured: the basic terminal of the insulation resistance meter should have the symbols of line terminal L, ground terminal E, and normal terminal G. The voltage between the insulation resistance meter line terminal L and the ground terminal E is the rated voltage, the open voltage, and the nominal voltage of the insulation resistance meter. When the insulation resistance meter is in an open circuit state at the two terminals, the measured voltage is Transmit H power, once. The insulation resistance meter measuring terminal L, E connected to the ten appropriate resistors measured by the output voltage value, 77
the median output resistance is the value of the insulated seven-yang meter scale near the center of the scale called the median ratio. The nuclear power function value is 1, 2, 5 or 10 times the value of the electrical difficulty of the large scale line 2%. Appendix 4 Insulation resistance meter output voltage is greater than 10mA (true current or pulse or current peak value) when the AC test is tested, voltage
record the resistance value:
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South receiving value,
insulation resistance meter medium voltage person
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the number is
the physical voltage
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