CN107748345B - Device and method for verifying parameters of secondary voltage dividing plate of high-voltage direct-current voltage divider - Google Patents
Device and method for verifying parameters of secondary voltage dividing plate of high-voltage direct-current voltage divider Download PDFInfo
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- CN107748345B CN107748345B CN201711092643.3A CN201711092643A CN107748345B CN 107748345 B CN107748345 B CN 107748345B CN 201711092643 A CN201711092643 A CN 201711092643A CN 107748345 B CN107748345 B CN 107748345B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model provides a high-voltage direct current divider secondary bleeder plate parameter calibration equipment, includes the direct current constant voltage source that is used for producing the required direct current voltage of calibration, is used for measuring direct current constant voltage source output current's first current transformer, is used for measuring secondary bleeder plate input current's first voltage transformer, is used for measuring direct current voltage between the secondary bleeder plate input terminal, is used for the first variable resistance of equivalent direct current divider's low pressure arm resistance, is used for measuring direct current voltage between the secondary bleeder plate output terminal, is used for measuring the third current transformer of secondary bleeder plate output current, is used for the second variable resistance of the photoelectric module internal resistance of equivalent direct current divider. The method has the advantages that the input/output resistance and the transformation ratio of the secondary voltage divider can be accurately simulated in the actual wiring mode of the direct-current voltage divider, the characteristic parameters of the secondary voltage divider can be checked, the defects of the secondary voltage divider can be found in time, and great economic benefits are achieved.
Description
Technical Field
The invention relates to the field of direct current system voltage measurement, in particular to parameter verification of a secondary voltage dividing plate of a direct current voltage divider.
Background
The DC voltage divider is important and core voltage monitoring equipment in the extra-high voltage converter station, and has the functions of realizing the real-time monitoring of the DC voltage of the converter station and feeding back the monitoring result to the DC control system, and influences and determines the control protection strategy and the operation mode of the DC engineering. Once the direct current voltage divider fails, the direct current system is blocked in a single pole if the direct current voltage divider is light, and the whole direct current transmission system is stopped if the direct current voltage divider is heavy, so that the operation risk of a power grid is obviously increased, and huge economic loss can be caused.
The direct current voltage divider generally comprises a body, a secondary voltage dividing plate and a photoelectric conversion module. The body is composed of a resistor and a capacitor of a high-low voltage arm, is packaged in an SF6 insulating medium, the probability of faults is low, the secondary voltage dividing plate and the photoelectric conversion module are generally installed in a terminal box and are affected by field climate and mechanical vibration, the problems of off-welding, wire breakage and the like of electronic components are easy to occur, once the problems occur, the transformation ratio of the direct current voltage divider is changed, the direct current voltage measurement is inaccurate, and the protection malfunction is possibly caused.
At present, the parameter calibration of the direct current voltage divider generally separates a body from a voltage dividing plate, and independently measures the high-low voltage arm resistance and the secondary voltage dividing plate input-output resistance, and the difference exists between the high-low voltage arm resistance and a factory test method, so that the test result is not compared, and whether the parameters of the secondary voltage dividing plate meet the requirements cannot be accurately judged. It is desirable to develop a device for verifying parameters of a secondary voltage divider of a dc voltage divider.
Disclosure of Invention
The invention overcomes the defect that the integral verification cannot be carried out under the condition that the secondary voltage dividing plate of the direct-current voltage divider is detached, and provides the testing device for verifying the parameters of the secondary voltage dividing plate in an analog direct-current voltage divider actual wiring mode.
The invention is realized by the following technical scheme:
the utility model provides a high-voltage direct current voltage divider secondary bleeder plate parameter calibration equipment, secondary bleeder plate be used for carrying out the secondary transformation ratio with direct current voltage's low pressure arm both ends voltage, calibration equipment including the direct current constant voltage source that is used for producing the required direct current of calibration, be used for measuring direct current constant voltage source output current's first current transformer, be used for measuring secondary bleeder plate input current's second current transformer, be used for measuring the first voltage transformer of direct current voltage between the secondary bleeder plate input terminal, be used for equivalent direct current voltage's low pressure arm resistance's first variable resistance, be used for measuring the second voltage transformer of direct current between the secondary bleeder plate output terminal, be used for measuring secondary bleeder plate output current's third current transformer, be used for equivalent direct current voltage's photoelectric module internal resistance.
As an improvement of the scheme, the control device further comprises a first control switch K1, a second control switch K2 and a third control switch K3; the direct-current constant-voltage source, the first control switch K1, the first current transformer and the second current transformer are connected in series and then connected with the two input terminals in parallel, and the first variable resistor is connected in series with the second control switch K2 and then connected with the direct-current constant-voltage source, the first control switch K1 and the first current transformer in parallel; the first voltage transformer is connected with the two input terminals in parallel; the second variable resistor, the third control switch K3 and the third current transformer are connected in series and then connected with the two output terminals in parallel, and the second voltage transformer is connected with the two output terminals in parallel.
As an improvement of the above-described scheme, the resistance value of the first variable resistor ranges from 10kΩ to 10mΩ, and the resistance value of the second variable resistor ranges from 100kΩ to 1mΩ.
The secondary voltage dividing plate is used for carrying out secondary transformation ratio on voltages at two ends of a low voltage arm of a direct current voltage divider, and comprises a direct current constant voltage source for generating direct current voltage required by verification, a first current transformer for measuring output current of the direct current constant voltage source, a second current transformer for measuring input current of the secondary voltage dividing plate, a first voltage transformer for measuring direct current voltage between input terminals of the secondary voltage dividing plate, a first variable resistor for measuring low voltage arm resistance of an equivalent direct current voltage divider, a second voltage transformer for measuring direct current voltage between output terminals of the secondary voltage dividing plate, a third current transformer for measuring output current of the secondary voltage dividing plate, and a second variable resistor for internal resistance of a photoelectric module of the equivalent direct current voltage divider, and the specific steps are as follows:
step 1, according to the actual resistance value R of a low-voltage arm of a high-voltage direct-current voltage divider Low pressure arm Adjusting the first variable resistor r1=r Low pressure arm ；
Step 3, slowly increasing the voltage of the direct-current constant-voltage source to enable the first voltage transformer to display U in The rated input voltage of the secondary voltage dividing plate is equal to that of the secondary voltage dividing plate; reading the first currentCurrent indication I of mutual inductor in Current indicator I of second current transformer 2 The method comprises the steps of carrying out a first treatment on the surface of the Reading voltage indication U of second voltage transformer out Current indication I of third current transformer out ；
Step 4, extracting the input resistor R of the secondary split plate in And an output resistor R out ：
The invention has the following beneficial effects: the input/output resistance and the transformation ratio of the secondary voltage divider can be accurately simulated in an actual wiring mode of the direct-current voltage divider, so that the characteristic parameters of the secondary voltage divider can be checked, defects of the secondary voltage divider can be found in time, and great economic benefits are achieved.
Drawings
FIG. 1 is a schematic diagram of a verification device according to the present invention.
Detailed Description
Example 1
As shown in fig. 1, a secondary voltage divider parameter calibration device of a high-voltage direct-current voltage divider, wherein the secondary voltage divider 1 is used for performing secondary transformation ratio on voltages at two ends of a low voltage arm of the direct-current voltage divider, the calibration device comprises a direct-current constant voltage source 2 for generating direct-current voltage required by calibration, a first current transformer 3 for measuring output current of the direct-current constant voltage source 2, a second current transformer 4 for measuring input current of the secondary voltage divider 1, a first voltage transformer 5 for measuring direct-current voltage between input terminals of the secondary voltage divider 1, a first variable resistor 6 for equivalent direct-current voltage between output terminals of the secondary voltage divider 1, a second voltage transformer 7 for measuring direct-current voltage between output terminals of the secondary voltage divider 1, a third current transformer 8 for measuring output current of the secondary voltage divider, a second variable resistor 9 for equivalent internal resistance of a photoelectric module of the direct-current voltage divider, a first control switch K1, a second control switch K2 and a third control switch K3; the direct-current constant-voltage source 2, the first control switch K1, the first current transformer 3 and the second current transformer 4 are connected in series and then connected with the two input terminals in parallel, and the first variable resistor 6 is connected in series with the second control switch K2 and then connected with the direct-current constant-voltage source 2, the first control switch K1 and the first current transformer 3 in parallel; the first voltage transformer 5 is connected with the two input terminals in parallel; the second variable resistor 9, the third control switch K3 and the third current transformer 8 are connected in series and then connected with the two output terminals in parallel, and the second voltage transformer 7 is connected with the two output terminals in parallel. The resistance value of the first variable resistor 6 ranges from 10kΩ to 10mΩ, and the resistance value of the second variable resistor 9 ranges from 100kΩ to 1mΩ.
Example 2
The utility model provides a high voltage direct current voltage divider secondary divider board 1 parameter calibration method, secondary divider board 1 be used for carrying out the secondary transformation ratio with direct current voltage among the low voltage arm both ends of direct current divider, as shown in fig. 1, including be used for producing the direct current constant voltage source 2 of the required direct current of calibration, be used for measuring direct current constant voltage source 2 output current's first current transformer, be used for measuring secondary divider board 1 input current's second current transformer 4, be used for measuring secondary divider board 1 input terminal direct current voltage's first voltage transformer 5, be used for equivalent direct current divider's low voltage arm resistance's first variable resistance 6, be used for measuring secondary divider board 1 output terminal direct current's second voltage transformer 7, be used for measuring secondary divider board 1 output current's third current transformer 8, be used for equivalent direct current divider's photoelectric module internal resistance's second variable resistance 9, its specific steps are as follows:
step 1, according to the actual resistance value R of a low-voltage arm of a high-voltage direct-current voltage divider Low pressure arm Adjusting the first variable resistor 6, R 1 ＝R Low pressure arm ；
Step 3, slowly increasing the voltage of the direct-current constant-voltage source 2 to enable the first voltage transformer 5 to count U in The rated input voltage of the secondary voltage dividing plate 1 is equal to that of the secondary voltage dividing plate; reading the current indication I of the first current transformer 3 in Current indication I of second current transformer 4 2 The method comprises the steps of carrying out a first treatment on the surface of the Reading the voltage indication U of the second voltage transformer 7 out Current indication I of third current transformer 8 out ；
Step 4, extracting the input resistor R of the secondary split plate 1 in And an output resistor R out ：
The foregoing detailed description is directed to embodiments of the invention which are not intended to limit the scope of the invention, but rather to cover all modifications and variations within the scope of the invention.
Claims (1)
1. The parameter verification method of the secondary voltage dividing plate of the high-voltage direct-current voltage divider is characterized by comprising a direct-current constant voltage source for generating direct-current voltage required by verification, a first current transformer for measuring output current of the direct-current constant voltage source, a second current transformer for measuring input current of the secondary voltage dividing plate, a first voltage transformer for measuring direct-current voltage between input terminals of the secondary voltage dividing plate, a first variable resistor for measuring low-voltage arm resistance of an equivalent direct-current voltage divider, a second voltage transformer for measuring direct-current voltage between output terminals of the secondary voltage dividing plate, a third current transformer for measuring output current of the secondary voltage dividing plate and a second variable resistor for internal resistance of a photoelectric module of the equivalent direct-current voltage divider, and comprises the following specific steps:
step 1, according to the actual resistance value R of a low-voltage arm of a high-voltage direct-current voltage divider Low pressure arm Adjusting the first variable resistor
R 1 ＝R Low pressure arm ；
Step 2, according to the number of photoelectric conversion modules accessed by the secondary voltage dividing plate and the internal resistance R Internal resistance of Adjusting the connection quantity of the second variable resistor and adjusting the second variable resistor R 2 ＝R Internal resistance of ；
Step 3, slowly increasing the voltage of the direct-current constant-voltage source to enable the first voltage transformer to display U in The rated input voltage of the secondary voltage dividing plate is equal to that of the secondary voltage dividing plate; reading the current indication I of the first current transformer in Current indicator I of second current transformer 2 The method comprises the steps of carrying out a first treatment on the surface of the Reading voltage indication U of second voltage transformer out Current indication I of third current transformer out ；
Step 4, extracting the secondary split plateInput resistor R in And an output resistor R out ：
Step 5, extracting a transformation ratio k of the secondary split pressing plate:
step 6, judging the reliability of the secondary voltage dividing plate of the high-voltage direct-current voltage divider, wherein the judging method comprises the following steps: the secondary voltage divider of the dc voltage divider should be replaced when one of the following conditions is satisfied: input resistor R in And an output resistor R out Compared with the factory value, the change is more than 0.2%; the transformation ratio k is compared with the factory value, and the change is more than 0.2%.
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| SU1109654A1 (en) * | 1982-05-26 | 1984-08-23 | Grudev Kim L | Method of measuring resistance |
| RU2007136466A (en) * | 2007-10-03 | 2009-04-10 | Закрытое акционерное общество "Арматурно-изоляторный завод" (RU) | METHOD AND DEVICE FOR MEASURING VARIABLE VOLTAGE BY VARIOUS DIVIDER |
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| SU1153308A1 (en) * | 1980-12-30 | 1985-04-30 | Предприятие П/Я Р-6237 | Method of testing d.c.voltage divider |
| CN102323558B (en) * | 2011-05-30 | 2014-07-02 | 中国西电电气股份有限公司 | Device and method for calibrating valve direct current residual voltage parameter tester of zinc oxide arrester |
| RU2578726C1 (en) * | 2014-10-29 | 2016-03-27 | Рустэм Газизович Хузяшев | Method of determining phase voltage, surface resistance and leak current for linear suspended insulator of overhead transmission line and device therefor |
| CN105116362B (en) * | 2015-08-26 | 2017-10-31 | 电子科技大学 | A kind of oscilloscope analog front end impedance inverter circuit with program control calibration function |
| CN106570209B (en) * | 2016-10-10 | 2021-06-04 | 广州市格宁电气有限公司 | Alternating current resistor voltage divider correction method for establishing error model based on equivalence principle |
| CN106291066B (en) * | 2016-10-31 | 2019-02-05 | 西安交通大学 | A kind of DC high voltage measurement and correction system and method based on divider time sharing sampling |
| CN206193226U (en) * | 2016-11-18 | 2017-05-24 | 云南电网有限责任公司电力科学研究院 | Synchronous calbiration system of direct current voltage transformer |
| CN106443549B (en) * | 2016-12-08 | 2019-09-06 | 上海市计量测试技术研究院 | A kind of analog AC resistance device for calibration battery internal resistance test device |
| CN106841860A (en) * | 2017-01-09 | 2017-06-13 | 中国电力科学研究院 | The CVT dynamic analog devices and its parameter acquiring method of a kind of use for laboratory |
| CN207650380U (en) * | 2017-11-08 | 2018-07-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of high voltage direct current divider second divided voltage board parameter calibration equipment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1109654A1 (en) * | 1982-05-26 | 1984-08-23 | Grudev Kim L | Method of measuring resistance |
| RU2007136466A (en) * | 2007-10-03 | 2009-04-10 | Закрытое акционерное общество "Арматурно-изоляторный завод" (RU) | METHOD AND DEVICE FOR MEASURING VARIABLE VOLTAGE BY VARIOUS DIVIDER |
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