Some standard content:
Verification procedure for voltage transformers for measurement
JJG 314—1994
Verification procedure for voltage transformers for measurement
Yerifiratlon Regukation or oltageTransforiuers of Measuring ServiceJJC314-:1994
Replaces J.IG 314—1983
This regulation is in accordance with the standard of the State Administration for Industry and Information Technology dated May 9, 1994, and is effective March 1, 1995. Starting point: National High-voltage Metering Station
Drafting unit: National High-voltage Metering Station
Drafting unit of this regulation: The main drafter of this regulation:
Wang Shu: National Commercial Voltage Metering Station!
Hu Peng: National Commercial Voltage Meter Station
Participant in the drafting:
Ling: (National Commercial Voltage Meter Station)
Zhong: National Station)
Yin Xiangshi: Jianjiang Lehe One-star Interactive Musical Instrument) Technical requirements·
Testing equipment and conditions
Three control items, daily verification methods
Four verification cycles.
． Processing of calibration results Appendix Method for determining the standard of capacitor voltage ratiometer Appendix 2 Format of calibration record Appendix 3 Format of calibration certificate Appendix 4 Format of calibration result notification Verification procedure for measuring voltage transformers This verification procedure is applicable to the calibration of 0.001~1 level measuring voltage transformers (hereinafter referred to as voltage transformers) with a rated frequency of 50 (60) Hz, newly manufactured, in use and after repair: Technical requirements Error limit Within the range of the rated power, rated power factor and 25% of the rated secondary load, the reading difference between the 0.1-1 level measuring voltage and the sensor shall not exceed the reading difference limit of 1. Table 1 Estimated frequency flash number - × 10-*
= a J0-
The rated power is 5%
.05n.n5n
The rated power is 100%
= × J0
The power consumption is 100%
, the actual whole curve effect of the inductor is not exceeded, and the high limit effect of the inductor is not exceeded. 20
2 The voltage and inductor used for measurement must meet all the technical requirements specified in the corresponding technical standards of this regulation. 2. Verification equipment and conditions
3 Main equipment
3. The standard contains industrial inductors or two-frequency voltage ratio standards (hereinafter referred to as standard instruments). The accuracy level and technical performance of the standard instrument shall meet the following requirements: 100
3,1.1 The standard instrument shall be compared with the voltage! The dead sensor can be as accurate as two virtual levels. Its actual error should not exceed the error limit of the voltage transformer. When the standard does not meet the above conditions, a standard instrument that is one level higher than the tested voltage transformer can be used as a standard. At this time, the error of the voltage transformer is measured by the formula of 17.2: 424
3.1.2 The variation of the standard instrument (the error value of the voltage rise and fall measured within the first time) shall not exceed 1/10 of the standard instrument error limit.
3.1.1 During the calibration period, the error of the standard instrument shall not exceed 1% of its error limit. 3.1.4 The standard instrument must have a complete design and be calibrated according to the specified organization. The actual value of the secondary system during use shall not differ from the load marked on the certificate by more than 10%. The load reduction certificate shall include the actual secondary load reduction. The rated load is WVA. The actual load of the secondary circuit shall have an impact on the measurement result and exceed the standard instrument error limit. [3.2 Error measurement device width: The measurement error caused by the measurement device shall not be within 10 of the sensor error limit under the specified voltage. First, the measurement error caused by the sensitivity of the device shall not be greater than 1/20, and the measurement error caused by the small graduation value shall not be greater than 1/15. The measurement error caused by the additional secondary load of the measuring circuit shall not be less than 1/2]. 3.3 Monitoring When using an electric meter:
, the external monitoring voltage should be used. The secondary working voltage of the filter should be accurate to level 1.5 or above. When the same quantity is detected, the internal impedance of the voltmeter remains unchanged. 3.4 Voltage load box:
When the rated frequency is 50 (6C! H, the load box is within the range of 20%-121% of the rated voltage, and the ambient temperature is 111-135%: the difference between the active part and the reactive part shall not exceed ±3%. When c=1, the remaining reactive part shall not exceed 3% of the rated load. 3.5 Power supply and regulation equipment:
The power supply and its regulation should have sufficient penetration and regulation details. The frequency of the power supply should be (above 5 [ (6l: = (.6) Hz]. The deformation coefficient is not more than 5%. 4 Environmental policy
4.1 The ambient temperature is +10~-35r, the relative humidity is not more than 80%, 4.2 The measurement error caused by the electromagnetic field of the equipment to be tested, such as the opener, the bed curtain, etc., should not exceed 10% of the measured voltage. 4.3 The measurement error caused by the external electric field should not exceed 1/20 of the measured voltage error limit. III. Verification items and verification methods
5 Requirements
5.1 Appearance inspection:
5.2 Determination of resistance:
5.3 T-frequency test:
5.4 Winding polarity inspection:
5. 5 Error measurement -
(Appearance inspection
If one of the following is missing, the specification will be determined after the issuance of the sub-specification: 1. No nameplate or the necessary markings are missing on the nameplate; 2. The connection terminals are not marked, the ring is small or there is no marking 6.3 The main sensor is not marked, the connection method is not good, and the north-south connection is not stable. 6.4 Other defects that seriously affect the calibration work: 425
7. Determination of leakage current
Use a megohmmeter to measure the thermal insulation current between each winding group to the ground. For any 2.5 million V Nordic terminal, the reference values for insulation are: long insulation of five inductors not less than 1k: full insulation of household appliances, one inductor less than 10kV: 8T frequency voltage test
The power frequency voltage test includes the power frequency pre-voltage test and the exposure voltage test. When conducting the power frequency voltage test, the safety work regulations must be strictly observed.
8. The power test and test methods of the newly manufactured power system core mutual inductance must comply with G311-1983 Multi-voltage Electrical Equipment Insulation 8.2 The voltage transformer used in the test room [not directly connected to the power system] after the new overhaul (all windings replaced or completely repaired) must comply with the relevant parts of ZBY096-1994 Technical Conditions for Precision Voltage Transformers: Test Methods and License GF311-[583. .3 After the small power system is running (including repaired) the power frequency voltage test shall be carried out in accordance with the requirements of the electrical equipment delivery standards of the Ministry of Electric Power. 8.4 For the positive transformers in laboratory use (including after minor repairs), the upper frequency test voltage is 60% of that specified in 2BY(96-:994) and the test method is in accordance with the relevant parts of 311-987. 8.5 For voltage transformers for special purposes, the upper frequency test voltage may be carried out according to the product technical conditions. 8.6 For the voltage transformers used in the laboratory, the upper frequency test voltage may be carried out according to the user's requirements during the periodic adjustment. 1. Voltage adjustment 9.1 The polarity of the transformer winding is determined to be sparse: 9.2 Voltage adjustment The differential measuring device equipped with a pseudo indicator is used for the normal wiring to check the consistency of the group. 9.3 The polarity check of the voltage sensor group can be carried out by other methods, such as DC method or AC method. 10 Error Longhe Single
10.1 Verification circuit:
10.1.1 White test circuit:
When the rated transformation ratio of the voltage sensor is 1, the line of Figure 1 and Figure 2 can be used for verification
Figure 1 Wide cavity war circuit "Isolation
Alternative measurement error request!
10.1.2. The method of measuring the difference between the voltage transformer and the soft line
Figure 2 (low voltage
end measurement error
and the rated transformer ratio of the standard instrument and the sensitive detection transformer is higher than the pole, the differential pressure can be taken from the high potential end or from the low potential end according to the type of error measurement device. When the difference is taken from the low potential age, the leakage current between the standard instrument and the second 425
bypasses the additional error caused by the transformer core and shall not exceed 1/20 of the identification difference limit of the mutual inductor.
a) The standard instrument is the voltage mutual comparison line (more than 3, 4): American
medical 3 comparison line (high voltage
b) The international standard instrument is the comparison line of the induction instrument (Figure 5, Figure 5): Xun|| tt||Figure 5 Comparison circuit (high voltage
position end secondary error)
In Figure 1 to Figure 6:
The corresponding terminals of the voltage transformer: E, x
The power supply voltage of the voltage transformer tester; A
Return to the city Di measurement safety engineering
Figure 4 Comparison line (low voltage
Return to the city Di measurement safety engineering
Figure 4 Comparison line (low voltage
Return to the city Di measurement safety engineering
The corresponding terminals of the voltage transformer: V
The difference voltage between the standard voltage transformer and the tested voltage transformer; Y-)Standard data provide capacitive proportional standard performance related line measurement standards using capacitive electrical proportional standards: refer to Appendix 1. 10.2 The voltage, load and power factor used when measuring the error coverage of the required voltage transformer. 10.2.1 During the synchronous verification, the voltage point is sufficient to pass the following conditions: 2. Standard method: Standard level: New voltage 100 2-, 5F H1. 10I,12: 0.02, 0.05, 0.1. 0.2 20, 30 fast safety bias generally set or secondary quality two power monthly fee predetermined low or general measurement can be used n.mt, 0.oc2, o on5.p.41. 0., o.05. D.1, C.3'
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used in the power system training.1. The system power 1 reciprocal belt, that is, the fixed power 2050% of the two production can be measured. 1.2.2 The new manufacturing and maintenance of the electric filter should be in accordance with the case shown in Table 3. The difference should be 3
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1A is set as the lower limit
1-4 Positioning
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10.2.3 Other special purpose voltage sensors can be used under the actual use of load and power factor teaching conditions to conduct energy error test.
10.2.4 When calibrating the selected model voltage sensor, after the supervision of the metrology agency or the main equipment department, the error measurement point can be reduced before confirming that it meets the requirements of this regulation. 10.3 The number of times the error of each measuring point of the controlled voltage transformer is measured 10.3.1 For the voltage transformer of level 2 as the standard, except for the 120% point reading error which is measured once, the error of each other point is measured twice (the voltage transformer of level 10 is set up in the measuring tool and the voltage transformer of level 0.2 and below is measured once): 10.3.2 For the voltage transformer of level 0.2 and below, the error of each measuring point is measured once (the voltage transformer of level 10 is set up in the measuring tool and the ... ), 10.4 Three-phase voltage transformer, the error between each primary positive voltage and the corresponding secondary line voltage should be measured separately: its circuit is shown in Figure 7.
The number in the figure is the same as before.
When encountering a disc error, the following conditions should be met: 10.4.1 Add a three-phase symmetrical balance voltage on the primary side; 11.4.2 The power supply positive voltage is connected to the secondary side of the voltage transformer under test according to the sequence, and the load of the same phase becomes 173 of the rated load..4.3
.5 For single-phase and single-phase power converters with safety energy groups, when measuring the differential, the zero group should be open and terminated:
10.6 Under the premise of meeting the requirements of Section 3 of the 4th see program, it is allowed to use the calibration circuit in the description to measure the error of voltage transformer 428
,
4 calibration cycle
I as a standard or in conjunction with other instruments and meters to meet the mother value. For transformers with special requirements, the calibration period is 2, and the voltage transformers for other purposes The calibration cycle of the device is 2 to 4 years according to the usage situation. The regulation on extending the calibration cycle is 11 years. If the device is used as the standard and is tested 3 times in 2 consecutive periods, and the last test result is compared with any of the previous 2 test results, if the change is within 1/8 of its error limit, the calibration cycle can be extended by 50% of the original one, that is, the calibration cycle is 3 years. If the 4th calibration meets the above requirements, the calibration cycle can be further extended by 1/3, and the calibration cycle is 4 years.
13 Provisions for shortening the calibration cycle
For voltage transformers with a rating of 0.2 or above and with a rating of 10 as the standard, if the error changes more than the specified value within the calibration cycle, the calibration cycle will be shortened from 2 years to 1 year.
14 After the first calibration, voltage transformers used in distribution stations are no longer required to undergo periodic calibration, and are allowed to be inspected together with the device. V. Processing of calibration results
J5. The calibration data shall be recorded in the format and requirements specified. For voltage transformers with a rating of 0.2 or above, the calibration cycle shall be shortened from 2 years to 1 year. For standard voltage transformers, the original records of their verification data shall be kept for at least two verification periods, and for the others, at least one verification period. 1 For non-standard graded transformers listed in this regulation, if they meet the requirements of this regulation, they shall be graded according to the lower grade of the standard grade listed in this regulation.
17 Calculation of the difference between the voltage transformer under test
I7,1 When the voltage transformer under test is one grade higher than the standard transformer, the following formula shall be used for calculation: f,-J, (% or 10*)
,=1 0-\rd）
Where f—ratio difference of voltage transformer; 3—phase difference of voltage transformer:
The ratio difference when voltage rises and falls is calculated as the average value; for voltage transformers of level 0.2 and below, it is the phase difference reading when voltage rises and falls: the technical average of the ratio difference readings; for voltage transformers of level 2 and below, it is the phase difference reading when voltage rises and falls: 17.2 The standard is one degree higher than the voltage transformer being tested. For each level, calculate according to the following formula: Fx=f,-f:(% or 10-)
=2,10ad
where f marks the ratio difference of the device:
marks the phase difference of the device,
1 day to judge whether the voltage transformer has exceeded the allowable error, take the revised data as the volume (3)
0.005-0.001 level voltage transformer ratio difference and cabinet transmission signal are both based on the chain inspection 4. The voltage transformer is 1H%1 about 10 phase difference of the error limit).
1-0.01 level electric speed controller ratio difference and when the position is adjusted according to Table 4, 24
Error
Ratio difference (%)
19 The output voltage mutual inductance that has passed the inspection should be issued with a verification certificate or marked with the verification pass mark. .3
19.1 The verification certificate shall list the various load difference values used for cold timing, and the maximum variable length value shall also be listed as a standard
19, 2 The verification result difference, if it is required by the user and can be used naturally, can be issued with a verification certificate according to the level of judgment: .3: Only when all the specifications are qualified can the accuracy level of the voltage and sensor be guaranteed. For H-type transformers and special voltage transformers, the verification results can only be shown in the verification plan.For level 2 and above positive transformers, after verification, the voltage transformers that fail to meet the standards shall be determined in accordance with this regulation. The manufacturer shall not be allowed to use them. The verification method of the capacitive voltage ratio value standard is as follows: 1
week 1 current comparison
slow type
in Figure 1 to 3
country 2 voltage divider type
Figure 3 impedance type
——high voltage standard capacitor solution: - low standard electric customer: PTx-a voltage transformer to be tested.
When the standard device is a capacitive voltage comparison standard device, the current comparison instrument type can be selected according to the error base device type: divider type or impedance bridge verification circuit. The current comparator bridge type circuit strategy error measurement device needs to be a high voltage capacitor analysis (Figure 1). 2. The error of the voltage transformer is measured by the voltage transformer calibrator [Figure 2]. The error measurement device of the line must be a comparator (using nanometer measurement feedback), as shown in Figure 3. The three-dimensional voltage transformer is set at a value not lower than 20%. The voltage value is zero. The total voltage calibration is completed. After the calibration is completed, the reference transformer is immediately replaced with a voltage transformer. The error measurement of the narrow-type mains voltage ratio standard should comply with the regulations in Section 3.2. Determination, monitoring electricity consumption after the meter becomes a regulation article 3.3 stipulates,
three calibration value determination
self-capacitive voltage standard device calibration reading error formula: er-Ve++e+ef+e
inspection request
manufacturer name
1 serial number
notification number
calibration value error of standard device:
during the measurement process, the maximum change of the capacitance and the support factor of the positive standard capacitor (including the influence of the business step and the environmental influence) ||tt ||Measurement process low crown you standard electric wear device electric waste and reported national number of large cavitation star (including early music influence agent environment influence
Consideration voltage device error at calibration point:
Secondary medium voltage
Determined by the Sa
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Standard for use at night :
Accuracy modification
Inspection of pan-time environment,
Structure change:
Electric resistance
Conclusion:
Full fixed case
Effective day for
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Work quota voltage meter monitoring
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