CN103941125A - Current distribution testing device and method - Google Patents
Current distribution testing device and method Download PDFInfo
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- CN103941125A CN103941125A CN201410163713.XA CN201410163713A CN103941125A CN 103941125 A CN103941125 A CN 103941125A CN 201410163713 A CN201410163713 A CN 201410163713A CN 103941125 A CN103941125 A CN 103941125A
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Abstract
The invention relates to a current distribution testing device and method. The current distribution testing device comprises a power generator, a transformer, a first switch, a second switch, first voltage dividers, second voltage dividers, shunts, a first measurement unit and a second measurement unit, wherein the power generator is connected with a primary coil of the transformer through the first switch, the first voltage dividers are connected to the two ends of a secondary coil of the transformer, the second voltage dividers are connected to the two ends of the secondary coil of the transformer through the second switch, the second measurement unit is connected with the first voltage dividers and the second voltage dividers, a plurality of circuits composed of tested objects and the shunts in series are connected to the two ends of the secondary coil of the transformer through the second switch, and the connected public ends of the tested objects and the shunts are connected with the first measurement unit. According to the current distribution testing device and method, the time of the power frequency voltage applied to the tested objects is controlled by controlling the opening time of the switches, the aim of power frequency current distribution measurement of a multi-column parallel resistance disc column of an MOV element of a series compensation device under the power frequency voltage is achieved, and powerful test data and powerful test guarantees are provided for reliable operation of the MOV element.
Description
Technical field
The present invention relates to a kind of distribution of current test unit and test method, be particularly related to a kind of metal oxide pressure-limiting device (Metal Oxide Voltage Limiter, be called for short MOV) power current distribution test device and test method, belong to the innovative technology of distribution of current test unit and test method.
Background technology
Along with the development of China's electric utility, transmission line capability and distance constantly increase, and adopt the flexible transmission of series compensation to obtain developing rapidly.MOV is the important protective device that string is mended device, at string, mends widespread use in device.MOV absorbs larger energy owing to being in operation, so MOV employing multicolumn resistor disc is in parallel, and measurement and research that the power current of MOV under its operating condition distributes are very important to the operational reliability of MOV.At present the distribution of current of MOV is measured to the general impulse current generator that adopts and measure its distribution of current, also cannot the power current under its operating condition of whole element of MOV be distributed and be tested, particularly under power current ripple, the distribution of current of each point be measured.
Summary of the invention
The object of the present invention is to provide a distribution of current test unit, the present invention solves the power current distribution measuring problem that string is mended the multicolumn parallel resistance sheet post of device MOV element under power-frequency voltage, and measurement and the record of power-frequency voltage and current waveform parameter, for the reliability service of MOV provides strong test figure and assurance.
Another object of the present invention is to provide a kind of test method of distribution of current test unit simple to operation.
In order to achieve the above object, the present invention is achieved by the following technical solutions:
Distribution of current test unit of the present invention, comprise generator, transformer, the first switch, second switch, the first voltage divider, the second voltage divider, test product, shunt, the first measuring unit, the second measuring unit, wherein generator is connected with the primary coil of transformer by the first switch, the first voltage divider is connected to the two ends of the secondary coil of transformer, the second voltage divider is connected on the two ends of the secondary coil of transformer by second switch, the second measuring unit is connected with the first voltage divider and the second voltage divider, some circuit that composed in series by test product and shunt are connected to the two ends of the secondary coil of transformer by second switch, and the common port that test product is connected with shunt is connected with the first measuring unit.
The test method of distribution of current test unit of the present invention, comprises the steps:
1) second switch that closes, starter-generator, first switch that closes, power-frequency voltage boosts by transformer, is applied on test product, controls the power-frequency voltage time being applied on test product by the opening time of the second gauge tap;
2) the second measuring unit utilizes capture card to gather respectively voltage waveform and the amplitude of the first voltage divider and the second voltage divider; The first measuring unit utilizes capture card to gather current waveform and the amplitude of each shunt;
3) use card reader to read the data on capture card in the first measuring unit, utilize computing machine to analyze and record the current waveform parameter of test product, obtain the distribution of current of the power current ripple each point of each test product in parallel.
The present invention includes large capacity short-circuit generator owing to having adopted, the structure of step-up transformer, linked switch, and by switch, control the duration that is applied to power-frequency voltage on test product, adopt different voltage dividers to measure the voltage of supply voltage and test product, adopt divertor or current mutual inductor coil to measure the electric current of MOV.Realized the distribution of the power current under its operating condition to whole element of MOV and tested, particularly under power current ripple, the distribution of current of each point is measured.The present invention solves the power current distribution measuring problem that string is mended the multicolumn parallel resistance sheet post of device MOV element under power-frequency voltage, and measurement and the record of power-frequency voltage and current waveform parameter, for the reliability service of MOV provides strong test figure and assurance.The test method of distribution of current test unit of the present invention is simple to operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of distribution of current test unit of the present invention.
Embodiment
With reference to Fig. 1, distribution of current test unit of the present invention, comprise generator 1, transformer 2, the first switch 3, second switch 4, the first voltage divider 5, the second voltage divider 6, test product 7, shunt 8, the first measuring unit 9, the second measuring unit 10, wherein generator 1 is connected with the primary coil of transformer 2 by the first switch 3, the first voltage divider 5 is connected to the two ends of the secondary coil of transformer 2, the second voltage divider 6 is connected to the two ends of the secondary coil of transformer 2 by second switch 4, the second measuring unit 10 is connected with the first voltage divider 5 and the second voltage divider 6, some circuit that composed in series by test product 7 and shunt 8 are connected to the two ends of the secondary coil of transformer 2 by second switch 4, and the common port that test product 7 is connected with shunt 8 is connected with the first measuring unit 9.
In the present embodiment, described the first voltage divider 5 is used for the voltage of secondary coil of measuring transformer 2; The secondary coil of described transformer 2 is connected with test product 7 by second switch 4; The first switch 3 and second switch 4 are used for controlling and are applied to power-frequency voltage and the duration on test product 7; Second voltage divider 6 in parallel with test product 7 is used for measuring the voltage of test product 7; The shunt 8 of connecting with test product 7 is used for measuring the electric current of test product 7; Described test product 7 composes in parallel for a plurality of resistor disc posts, and each parallel resistance sheet post is all connected with a shunt 8.
In the present embodiment, above-mentioned the second measuring unit 10 utilizes capture card to gather respectively voltage waveform and the amplitude of the first voltage divider 5 and the second voltage divider 6.Above-mentioned the first measuring unit 9 utilizes capture card to gather respectively current waveform and the amplitude of each shunt 8.Above-mentioned generator 1 adopts jumbo short-circuit generator.Above-mentioned the first voltage divider 5 and the second voltage divider 6 adopt capacitive divider.Above-mentioned shunt 8 adopts divertor or current mutual inductor coil.
In addition, above-mentioned the first measuring unit 9 and the second measuring unit 10 are provided with and have the interface that communication is provided to host computer.The first measuring unit 9 and the second measuring unit 10 are transferred to the voltage that passes through test product 7, current waveform parameter and the result of calculation that collect in host computer by communication cable, optical fiber and wireless telecommunications.
The test method of distribution of current test unit of the present invention, comprises the steps:
1) second switch 4 that closes, starter-generator 1, first switch 3 that closes, power-frequency voltage boosts by transformer, is applied on test product 7, controls the power-frequency voltage time being applied on test product 7 by the opening time of the second gauge tap 4;
2) the second measuring unit 10 utilizes capture card to gather respectively voltage waveform and the amplitude of the first voltage divider 5 and the second voltage divider 6; The first measuring unit 9 utilizes capture card to gather current waveform and the amplitude of each shunt 8;
3) use card reader to read the data on capture card in the first measuring unit 9, utilize computing machine to analyze and record the current waveform parameter of test product 7, obtain the distribution of current of the power current ripple each point of each test product in parallel.
Claims (8)
1. a distribution of current test unit, it is characterized in that comprising generator (1), transformer (2), the first switch (3), second switch (4), the first voltage divider (5), the second voltage divider (6), test product (7), shunt (8), the first measuring unit (9), the second measuring unit (10), wherein generator (1) is connected with the primary coil of transformer (2) by the first switch (3), the first voltage divider (5) is connected to the two ends of the secondary coil of transformer (2), the second voltage divider (6) is connected to the two ends of the secondary coil of transformer (2) by second switch (4), the second measuring unit (10) is connected with the first voltage divider (5) and the second voltage divider (6), some circuit that composed in series by test product (7) and shunt (8) are connected to the two ends of the secondary coil of transformer (2) by second switch (4), and the common port that test product (7) is connected with shunt (8) is connected with the first measuring unit (9).
2. distribution of current test unit according to claim 1, is characterized in that above-mentioned the second measuring unit (10) utilizes capture card to gather respectively voltage waveform and the amplitude of the first voltage divider (5) and the second voltage divider (6).
3. distribution of current test unit according to claim 1, is characterized in that above-mentioned the first measuring unit (9) utilizes capture card to gather respectively current waveform and the amplitude of each shunt (8).
4. distribution of current test unit according to claim 1, is characterized in that above-mentioned generator (1) adopts jumbo short-circuit generator.
5. distribution of current test unit according to claim 1, is characterized in that above-mentioned the first voltage divider (5) and the second voltage divider (6) adopt capacitive divider.
6. distribution of current test unit according to claim 1, is characterized in that above-mentioned shunt (8) adopts divertor or current mutual inductor coil.
7. according to the distribution of current test unit described in claim 1 to 6 any one, it is characterized in that above-mentioned the first measuring unit (9) and the second measuring unit (10) are provided with and have the interface that communication is provided to host computer.
8. a test method for distribution of current test unit, is characterized in that comprising the steps:
1) second switch (4) that closes, starter-generator (1), the first switch (3) that closes, power-frequency voltage boosts by transformer, be applied to test product (7) upper, by the opening time of the second gauge tap (4), control the power-frequency voltage time being applied on test product (7);
2) the second measuring unit (10) utilizes capture card to gather respectively voltage waveform and the amplitude of the first voltage divider (5) and the second voltage divider (6); The first measuring unit (9) utilizes capture card to gather current waveform and the amplitude of each shunt (8);
3) use card reader to read the data on capture card in the first measuring unit (9), utilize computing machine to analyze and record the current waveform parameter of test product (7), obtain the distribution of current of the power current ripple each point of each test product in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410163713.XA CN103941125B (en) | 2014-04-23 | 2014-04-23 | A kind of CURRENT DISTRIBUTION experimental rig and test method |
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| CN201410163713.XA CN103941125B (en) | 2014-04-23 | 2014-04-23 | A kind of CURRENT DISTRIBUTION experimental rig and test method |
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| CN103941125B CN103941125B (en) | 2017-03-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105425018A (en) * | 2015-12-31 | 2016-03-23 | 中国西电电气股份有限公司 | Method for testing resistor disc column parallel current distribution |
| CN108120890A (en) * | 2017-12-23 | 2018-06-05 | 中国西电电气股份有限公司 | A kind of parallel resistance piece column current location mode |
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| CN105425018A (en) * | 2015-12-31 | 2016-03-23 | 中国西电电气股份有限公司 | Method for testing resistor disc column parallel current distribution |
| CN108120890A (en) * | 2017-12-23 | 2018-06-05 | 中国西电电气股份有限公司 | A kind of parallel resistance piece column current location mode |
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| CN103941125B (en) | 2017-03-29 |
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