Some standard content:
Verification Regulation of High Insulation Resistance Meter (Meterometer)
JJG 690—1990
Verification Regulation of High Insulation Resistance Meter
.JC690—1990
This verification regulation was approved by the State Technical Supervision Bureau on June 14, 1990, and was implemented on October 1, 1990. Responsible unit: National Voltage Metering Station
Reform unit: National High Voltage Metering Station
China Institute of Metrology
The technical text of this regulation is from the starting unit quality assurance group. The main drafter of this program: Huang Shengjie (Juxiang High Voltage Measurement Station) Yin Daxiao (Ningguo Metrology Science Institute) Participating drafters: Deng Ping [National Metrology Science Institute] Huang Weimin (National High Voltage Measurement Station) Qing Derong [Yunjia High Voltage Measurement Station] Overview · Technical requirements Verification conditions Verification date will be set Verification Procedures
Processing of Verification Results and Verification Period
Verification Procedures for High Insulation Resistance Meters and Meters】This procedure is applicable to the verification of high insulation resistance testers with built-in test power supply and auxiliary amplifier, which can measure the insulation resistance of 10000M or more, including newly manufactured, newly purchased, used and repaired high insulation resistance testers, and is not applicable to the verification of insulation resistance meters, digital insulation resistance testers and replacement. This procedure does not involve the qualification of the electrodes of single insulation testers.
1 Working principle
1.1 High insulation resistance full-scale instrument needs to use two-effect tester to measure the value of high-value insulator, electrical materials, electrical products and electronic components. It is a general electronic measuring instrument. 1.2 High insulation resistance full-scale instrument consists of three parts:
1. High insulation resistance indicator
Basic principle diagram of the instrument: Figure 1
The high insulation resistance power supply provides the test voltage applied to the sensitive resistor and is divided into grades through the voltage divider. In order to reduce the size of the step-up transformer, the primary of the transformer is supplied with high-frequency voltage by the oscillator, and the secondary voltage is rectified and filtered to obtain a DC voltage. R, R3\ are standard resistances, and R card is used to adjust the full scale of the instrument. When the magnification switch is connected to R, there is a fixed voltage at R, if the amplification factor of the amplifier is stable, the indicating instrument should deflect to the full scale, if there is a deviation, then R, so that the indicator is moved to the full scale, the other standard resistance R. It is used to change the measuring point of the resistance. During the test, the tested bar is connected in series with the input resistance of the high impedance DC amplifier and connected across the DC power supply. The high impedance DC amplifier controls the resistance 1 through the output of the indicating instrument, and the indicating meter directly outputs the measured voltage:
Mountain, when designing, R, net R, and adopt the reverse measurement amplifier: RR
Wuzhong: —— test voltage (V
—— voltage on Re (V)||tt ||When it is only used for micro-current measurement, only high impedance current amplifier is used to amplify the measured micro-current signal, and the indicator directly indicates
2 Functions and features
2.1 High insulation resistance tester has two functions: resistance measurement and micro current measurement. 2.2 Features of commercial insulation resistance tester The ratio of the maximum compensation of the resistance tester to the high test voltage is greater than or equal to the technical requirements
3 The sensitivity of the high insulation resistance tester is more than 100% of the table 1: 706bzxZ.net
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High Insulation Resistance Measuring Instrument Accuracy Level Forging is divided into: 1.3.2.0, (3.01, 5., 10, 20.|| The maximum allowable error of resistance measurement of high insulation resistance measuring instrument is shown in Table 2.
5 Basic error of resistance measurement
5.1 The basic error calculation formula of resistance measurement with small value is as follows:
(K-k×100%
Get the range of resistance measurement
x1×10
>I×m
1 ×[0
, table currency, for the whole.
where: R.
… a high insulation resistance measurement and receiving resistance measurement with digital scale value Re
indicates the actual resistance value of the above scale value: H standard value,
for non-practical scale insulation resistance limit measurement position reference value is the indicated value. 1033
maximum allowable charge
5.3 insulation resistance measurement for non-linear scale Measuring instrument, the standard diagram of resistance measurement is from the lowest resistance value shown on one end of the meter to 10 times of its resistance value. The range of 10 times the scale value is adjusted to the old area. The allowable value of the high-insulation resistance measuring instrument is larger than the current value in the question. Please refer to Table 3. The calculation formula of the basic setting error of the high-insulation resistance measuring instrument for each selected scale line is as follows: Range (A) Maximum allowable error (%) 110 1-1<:0-4
+2: 1F-16-1×10-14
±±34
Formula: i
1,-×100%
Micro-current band number:
[—……Indicates the actual current value of the above scale value; standard value.
For linear scale micro-current full-scale instrument, its reference is the measurement standard. B: Terminal voltage
8.1 When the terminal is in the open state, the actual value of the output voltage is called the terminal voltage, 8.2 When the measurement button is in the open state, the specified value of the output voltage is called the rated voltage. (2)
8.3 When measuring resistance, the error of the torsion voltage shall not directly affect the measurement error. The maximum allowable error of the torsion voltage must be less than the accuracy grade index (%) of the commercial insulation resistance measurement, and shall not exceed 5%. 8.4 The error of the measured voltage shall be calculated as follows: e.
×100%
Where: U is the nominal (rated) value of the insulation resistance measurement terminal (V); u is the actual value of the insulation resistance measurement terminal (V). Ripple voltage
The root square value of the ripple content in the insulation resistance measurement terminal (DC voltage) shall not exceed 1% of the DC component.
10 Insulation resistance
The power supply voltage of the commercial insulation resistance instrument The insulation resistance between the casing and the external touchable parts shall meet the following requirements:
10-1 For circuits where the working voltage of the tested meter does not exceed 500V, the insulation resistance value shall not be less than 2M010.2 For circuits where the working voltage of the tested meter exceeds 5[IV, the above insulation resistance value shall be multiplied by a coefficient: the coefficient is equal to the next working voltage divided by 510V
11 Test voltage
The insulation resistance of the whole position shall be subjected to a voltage test. The test circuit shall be connected to the meter 4 for 4 hours. The test time is 1mine
The insulation resistance between the test circuit and the machine and the touchable conductor)
12 Test voltage (AC or DC) (V)
> 60 - 13℃
>130- 250
Test voltage (cross-current short-terminal)
High insulation resistance measurement and zero-current measurement (current input short-terminal) within 85 shall not be greater than 5% of the full length of the scale, three verification conditions
Standard environmental conditions
High insulation resistance measurement only during verification: the temperature is 20-23℃: 0%-0% of the attached temperature
Test site: other strong external power sites, power grid: sufficient deviation:
All test equipment have effective verification Technical requirements for calibration equipment in the calibration method 14 During the calibration, the total uncertainty introduced by the environmental conditions and the setting shall not exceed 1/3 of the maximum allowable error of the most difficult element. Four calibration items High insulation electric positive side salt meter daily planning table 5. 15 Small protection port 1 External pull-out test 5. Reduce the error of the new system strength 5 Electrical sensitive joint measurement 7. Rapid resistance measurement x.Ketone test phase
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Note: Lost ten + "★ request will be determined:" means after the danger, x
Five inspection methods
16 External death control food
Combustion sequence E know the determination
High absolute continue to see the measurement agreement should have the necessary method to ensure that the meter is correctly used with the same interpretation of the manufacturer, source number, model and "H period reduction standard derivative director, state period now determined
High self-protection thin products this time do not allow defects that affect the integrity, you, good season mail incomplete, play dynamic, period of incomplete into dirty, etc.:
17 step-by-step inspection
Power on the meter under inspection according to the manual, adjust the format, check the dynamic Whether it is normal, use a voltmeter with an input value not less than 10 times the internal resistance of the power supply of the insulator being tested and a voltmeter with an error not higher than the allowable error of 10 for measuring the low resistance of the insulator being tested. The manufacturer of the suitable instrument should provide an insulator with an internal resistance of 100% of the power supply of the insulator being tested. Insert the voltmeter of clause 18.1 into the "E" and "L" terminals of the meter being tested and measure the voltage at each level. 18.3 Follow clause 8.4 and use formula (3) to calculate the positive and negative terminal voltage difference. The voltage reading must meet the requirements of clause 6.3. 19 Resistance measurement error verification
.1 The actual value of any scale line of each measurement limit of the high insulation resistance measuring instrument can be expressed by the following formula; Rx-KyKahRR
Formula: R—
The actual value of the selected measurement limit [your basic measurement limit] service scale line: K—.-.The actual value of the measurement limit and the basic measurement limit K
The basic measurement limit and the basic electrical reporting value:
19.2 When the high insulation resistance measuring instrument has been corrected to the basic limit, the resistance measurement error is considered to be the comprehensive error of the current limit, and the error is corrected to the resistance multiple error: e=t +e +
Where: r
Basic limit of the electric engraving measurement station error: electric basis multiplier setting error:
Three general rate identification error.
The basic error of resistance measurement is verified by the following method: 19.3
Company: can produce standard electric positive device (standard plate) to reach:; 3, voltage compensation (bias compensation) operation;
. Electric positive current (component risk determination! Method.
19.4Use any of the above When measuring resistance with this method, a basic limit is selected as the full inspection limit, and all digital scales within the effective range are fully inspected: the reference limit is usually selected at 1, and the remaining scales do not need to be fully inspected, which is called the full inspection limit. 19.5 When measuring resistance with a non-full inspection limit, the start point, middle point and end point (digital scale) of the effective measurement range can be inspected. Or the sample should be calibrated at the full inspection limit and the positive and negative error lines.
19.6 For a multi-scale resistance measuring instrument, one of the scales (the scale with the starting point and the dividing line of points 1 to 1) should be calibrated according to Article 19.4.135. The limits of the other scales are not full inspection limits. Calibration should be carried out in accordance with Article 19.5.
19.7 After the basic quantity is determined, the test voltage range of Da Shang should be selected to measure the resistance until it is This error test is called this voltage range. The voltage range corresponding to the basic voltage range is usually not more than 1HFV. 19.8 Variable standard resistor (standard resistor) method 19.8.1 The test connection diagram is shown in Figure 2. The accuracy level of the standard resistor used is the same as that of the high-absolute resistance. The energy level of the standard resistor is 2. , adopt the standard heart rate reduction method to measure the basic error price determined by the wiring
measurement, the general measurement benefit person promises the competition difference system as shown in 6, 710
rate finally determined on the day to measure the position
electricity used to measure the person's allowable error space
standard resistor
accurate space equivalent
± 10.3=20.0
standard seven resistors in the commercial absolute final voltage measurement this sign is also under the calibration, according to the standard resistor test method of the country's non-standard, the resistor test institute, the voltage variation caused by any value after the voltage value from the nominal working voltage to its 1 voltage value should not exceed the machine grade index), 19, month.2 standard group resistors are the tested competition norm resistance measurement only the reading line index, the value is allowed to discuss the difference! 20.19.B.3 Under the condition of the voltage, the basic error of the resistance measurement is verified by the following steps:
, the standard resistor is adjusted to make the needle rise, and each digital scale in the scale is stopped in turn, and the resistance value of the standard resistor is read until the maximum value is reached. Then the meter is corrected to pass the maximum value, and then the standard resistor is subtracted to solve the resistance value, and then the resistance value of the standard resistor is taken in turn, and the error caused by the virtual error in the measurement dial is calculated (the formula (1) of Article 5.1 of the Grant). 19.8.4
Basic voltage limit The resistance measurement error verification of non-full-measurement double-value resistors shall be carried out according to Section 19.5 and Section 19.8.3.
19.9 Voltage compensation method
19.9.1 In the measurement range greater than 10\Ω, since most standard resistors have fixed resistance values, the basic error verification of resistance measurement shall be carried out using the voltage compensation method:
19.9.2 When the voltage compensation method is used, the basic root error of resistance measurement shall be calculated according to the following formula: E
Where:
: 100%
The compensation voltage is the voltage (V) applied to the standard resistor when the probe reaches the detection graduation line. The voltage is in the same direction as the terminal voltage. The voltage (V) applied to the standard resistor is equal to the sum of the measured voltage and the compensation voltage. 19.9.3 Use the voltage compensation method When the basic error of reverse resistance measurement is controlled, the verification wiring rate is shown in Figure 3. In the figure, the voltage compensator is at a high potential:
New control high medium
Le compensation part
Standard device
Figure 3 uses voltage compensation. However, when the resistance measurement error is increased, the standard resistor 19.9+ is set, and the terminal pressure is measured to the installation and the length of the electric compensator. There is no maximum resistance measurement error. The relationship between the charging amount and the difference is shown in Table 7, 711
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19.9.5 The voltage compensator should be variable and have a weak value. Its adjustment range should be 120% of the allowable error of the indication value of the scale line of the high-insulation resistance measuring instrument under test. Its resistance should be 1/1 of the minimum limit of the insulation resistance measuring instrument under test
19.9.6 Under the current pressure range, all tests are carried out with digital scale lines, and the resistance measurement error verification is carried out according to the following steps:
Measure the voltage compensation of the meter, so that the needle of the high-insulation resistance measuring instrument under test moves from the two forces to the scale line, and then measure the size and resistance of the measured high-insulation resistance, whichever is larger: Dial the formula (6) in Section 19.9.2 to calculate the difference. 19.9.7
The basic voltage will be lowered, and the non-full-test limit electric power will be used to control the error of the test product card. The non-full-test limit resistance measurement basic car error is carried out by the following method: 1.1
According to the full inspection and resistance, the non-full image benefit limit pull measurement results, calculate the non-full inspection limit resistance ratio error -KK?
Where: K shop is the non-full inspection limit resistance ratio of the gold inspection limit: Kt
is the actual resistance ratio of the non-full inspection limit Kek
1iR _R2_ R
Where: R14, R2, R3,
K, R, R+| ...11 The ear group measurement of non-basic electrical calendar file is integrated according to the above steps: 19.11.! According to the formula of Article 19.10 (7), the estimated induction difference is calculated = K14.11.2 According to the following formula, the pressure error is calculated: FA.p
Km-Kaa
Kia-Ee
Where: x
The nominal multiple of the monthly voltage of the drum test and the basic electrical service consumption: the nominal voltage of the normal test file:
The nominal voltage of the basic voltage file:
The actual multiple of the monthly voltage file of the test and the basic voltage file; L
The actual voltage of the voltage bar:
When the actual voltage
19.L1.3 refers to the basic voltage under the full detection limit of the resistance measurement error, the non-full detection limit resistance is extended by the error rate of the basic voltage measurement error, and the maximum possible error value of the basic error of any limit resistance measurement is calculated by formula (iii). The steps are as follows: 19.2 The maximum possible error value of the basic error of any limit resistance measurement is calculated by formula (5)
s kilun+ E rerri
shnxtEknmxi
ERAnBR,EKrur
h The difference is calculated by formula:
ux=CpB+enT Eumux
E\mIT=ERRANNTEKMTEKum
In the sum, take the absolute value of the error and use it as the detection limit and the error.℃. Among the above errors, when any item has no negative error, the most positive and minimum negative error should be selected from the error. When there is no negative error, the most positive and minimum error should be selected, and then the two carbon differences are calculated according to the principle of maximum energy consumption. The error with the larger absolute value is used as the detection limit error. For example, the 6 errors in a prohibited item in the determination result are: =Rnm., EMMrus!
, (the item has no negative error
tRarax=kumn (the negative error
is calculated according to the following formula! The filter error value: C ax ekinn +enkain-EKHiex
E\n, f.hMuwx I t X *e kr r
The one with the larger absolute value is used as the test quantity. The error is limited to the measurement error: (14)
19.11.4 Combine the calculation results of 19.11.3 with the error limit 1 and Table 2 to find the maximum value of the error.
19.12 And the voltage current (component verification method
19.12.1 According to the principle of high insulation group measurement, it can be divided into a single part of the direct current and the current of the effective large group and the indicating instrument group? They are determined separately, and then the basic error of resistance measurement is calculated. High insulation image South test instrument The actual value of the resistance of the wire is: Kx=
Where: [--The actual value of the voltage formed by the tested line pair (V): [--The actual value of the current corresponding to the tested line (V). The tested inductor resistance is measured at the basic differential current of 5.1 points! 14.12.2 The terminal voltage of the high insulation measuring instrument is 1%. 18.2 is measured: 19.12.3 Use a standard current source to calibrate the basic differential current of the current measuring device. 19.12.1 The basic error of current measurement is shown in Figure 4, (16)
19.12.5 is still shrinking The error caused by the resistance measurement should be large and the error caused by the standard micro-current source should be large. The error caused by the resistance should meet the safety requirements. 19.12.6 The calibration should be carried out from the maximum current measurement limit (i.e. the magnification is related to the maximum current measurement limit). This is the full calibration limit, and the other limits do not need to be full, and the non-full calibration limit can be moved. 19.11.7 Enter the corresponding small current within the full calibration limit, and calibrate the digital graduation line of each band:
Adjust the standard micro-current source to make the needle read up continuously, stop on the digital graduation of each band on the scale, and read the standard The current value of the micro-current source is read until the maximum measurement limit, and then the standard current source is used. When the standard current is used, the self-flow measurement base is set in the measurement area. The error is calculated by formula (2) in Article 7. 19.12.8 The non-full inspection panel only shows the full-scale error line: that is, the full-scale current limit is full of error, and the error is calculated according to the measurement result (calculated according to formula (2) in Article 19.12.9 According to the test results of Articles 19.12.2, 19.12.7, 19.12.8, etc., use the frequency of Article 19.12.1 to verify the error of the limited current measurement. The results of the basic error of the three methods of resistance measurement shall meet the requirements of Table 2 of Article 5. 20
Other methods that meet the accuracy level are allowed to be used for basic error verification of resistance. 22 Basic error determination of current measurement
22.1 Basic error determination of current measurement shall be carried out in accordance with Item 19.12.3 and Item 15.12.#. 22.2 The basic error components of the tested quantities shall meet the requirements of Table 3 of Article 5. 23 The basic error components of the terminal current measurement shall be included in the micro-components.5. The current measurement disk of the standard micro-current source should be large enough to allow the error and the error of the standard micro-current source. The current value of the standard micro-current source should be adjustable, and the error introduced by the resistor should meet the safety requirements. 19.12.6 The calibration should be carried out from the maximum current measurement limit (i.e. the magnification is related to the maximum current measurement limit). This is the full calibration limit, and the other limits do not need to be full-calibrated, and the non-full calibration limit can be moved. 19.11.7 Enter the corresponding small current within the full calibration limit, and calibrate each digital graduation line:
Adjust the standard micro-current source to make the needle read continuously and rise, and stop on each digital graduation within the scale for a time, and read the standard micro-current. The current value of the current source is read until the maximum limit, and then the standard current source is adopted. When the standard current is used, the self-flow current source is set in the basic measurement area. The current value is read in sequence. The larger difference is calculated according to the formula (2) in Article 7. 19.12.8 Non-full inspection panel only with inspection indicator Ten-point line: that is, the full current limit error is full, the error is correct, and the error is calculated according to the measurement results (calculated according to formula (2) in Article 19.12.9 Based on the test results of Articles 19.12.2, 19.12.7, 19.12.8, etc., use the frequency of Article 19.12.1, (16) to verify the limited current measurement errors. With the three methods of resistance measurement from this The error results shall meet the requirements of Table 2 of Article 5. 20
Other methods that meet the accuracy level are allowed to be used for basic error verification of resistance measurement. 22 Basic error determination of current measurement
22.1 Basic error determination of current measurement shall be carried out in accordance with Item 19.12.3 and Item 15.12.#. 22.2 The basic error components of the measured quantities shall meet the requirements of Table 3 of Article 5. 23 The basic error components of the terminal current measurement shall be included in the micro-components.5. The current measurement disk of the standard micro-current source should be large enough to allow the error and the error of the standard micro-current source. The current value of the standard micro-current source should be adjustable, and the error introduced by the resistor should meet the safety requirements. 19.12.6 The calibration should be carried out from the maximum current measurement limit (i.e. the magnification is related to the maximum current measurement limit). This is the full calibration limit, and the other limits do not need to be full-calibrated, and the non-full calibration limit can be moved. 19.11.7 Enter the corresponding small current within the full calibration limit, and calibrate each digital graduation line:
Adjust the standard micro-current source to make the needle read continuously and rise, and stop on each digital graduation within the scale for a time, and read the standard micro-current. The current value of the current source is read until the maximum limit, and then the standard current source is adopted. When the standard current is used, the self-flow current source is set in the basic measurement area. The current value is read in sequence. The larger difference is calculated according to the formula (2) in Article 7. 19.12.8 Non-full inspection panel only with inspection indicator Ten-point line: that is, the full current limit error is full, the error is correct, and the error is calculated according to the measurement results (calculated according to formula (2) in Article 19.12.9 Based on the test results of Articles 19.12.2, 19.12.7, 19.12.8, etc., use the frequency of Article 19.12.1, (16) to verify the limited current measurement errors. With the three methods of resistance measurement from this The error results shall meet the requirements of Table 2 of Article 5. 20
Other methods that meet the accuracy level are allowed to be used for basic error verification of resistance measurement. 22 Basic error verification of current measurement
22.1 Basic error verification of current measurement shall be carried out in accordance with Item 19.12.3 and Item 15.12.#. 22.2 The basic error components of the measured quantities shall meet the requirements of Table 3 of Article 5. 23 The basic error components of the terminal current measurement shall be included in the micro-components.
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