CN202177693U - Industrial frequency withstand voltage and insulation resistance testing apparatus for current transformer - Google Patents
Industrial frequency withstand voltage and insulation resistance testing apparatus for current transformer Download PDFInfo
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- CN202177693U CN202177693U CN2011203428696U CN201120342869U CN202177693U CN 202177693 U CN202177693 U CN 202177693U CN 2011203428696 U CN2011203428696 U CN 2011203428696U CN 201120342869 U CN201120342869 U CN 201120342869U CN 202177693 U CN202177693 U CN 202177693U
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Abstract
The utility model discloses an industrial frequency withstand voltage and insulation resistance testing apparatus for a current transformer and relates to the industrial frequency withstand voltage and insulation resistance testing apparatus for the current transformer. A traditional withstand voltage tester and an insulation resistance meter cannot meet requirements of automatic verification, and wiring is repeated in test, thereby being low in efficiency and dangerous. The industrial frequency withstand voltage and insulation resistance testing apparatus for the current transformer comprises a program control source, a plurality of parallel test branches, a power switching relay, a current sampling module and a control module, wherein the program control source is used for supplying high-voltage alternating current and low-voltage alternating current; the plurality of parallel test branches are connected with the program control source to provide the power supply for a primary winding or a secondary winding of a transformer; the power supply switching relay is connected with the test branches in series for switching the high-voltage alternating current and the low-voltage alternating current output by the program control source; a sampling end of the current sampling module is arranged on the testing branch; and the control module is used for controlling the power supply of the program control source and the work of the test branches. The plurality of parallel test branches automatically test the transformers of a corresponding number, therefore, personal factors are reduced, the production efficiency is effectively improved, the errors are reduced, and the safety is ensured.
Description
Technical field
The utility model relates to a kind of
current transformer industrial frequency withstand voltage and insulation resistance testing device.
Background technology
According to the regulation of national metrological verification regulations and State Grid Corporation of China's low-voltage current mutual inductor technical requirement, the current transformer test comprises preventive trial projects such as insulation measurement, power frequency withstand test and turn to turn test.In the artificial calibrating of the tradition operation, these projects need wiring repeatedly, and relate to high-potting and have certain potential safety hazard.The automatic calibration streamline has realized that connecing automatically of these preventive trial projects taken out stitches, test automatically, automatic judged result, has improved work efficiency, has ensured safety in production.Traditional Hi-pot Tester and insulation resistance meter can not satisfy the needs of automatic calibration, therefore need exploitation one cover can with the tight integrated withstand voltage and insulation resistance testing device of automatic calibration system.
The utility model content
The technical matters that the utility model will solve and the technical assignment of proposition are that the prior art scheme is improved and improved; A kind of current transformer industrial frequency withstand voltage and insulation resistance testing device are provided, to reach power frequency withstand test and the insulation measurement of accomplishing low-voltage current mutual inductor automatically, quickly and accurately.For this reason, the utility model is taked following technical scheme.
Current transformer industrial frequency withstand voltage and insulation resistance testing device is characterized in that: comprise the test branch road that is used to that the program control source of High Level AC Voltage (AC3000V) and low-voltage DC (DC500V) is provided, is connected a plurality of parallel connections of thinking the power supply of winding of mutual inductor or Secondary Winding with program control source, power supply transfer relay, the sampling end of connect with the test branch road High Level AC Voltage that is used to switch the output of program control source and low-voltage DC are positioned at current sample module on the test branch road, be used to control the control module that program control source supplies power and tests branch road work.The test branch road of a plurality of parallel connections carries out from dynamic test the mutual inductor of respective numbers, reduces human factor, effectively enhances productivity, and reduces error, by control module program control source is controlled, and the possibility that the minimizing personnel contact with high-tension electricity is guaranteed safety.
As the further of technique scheme improved and replenish, the utility model also comprises following additional technical feature.
Described test branch road comprises and is used for once holding a winding connection branch road that is connected and the Secondary Winding that is used for being connected with the mutual inductor secondary terminals to connect branch road with mutual inductor; Described winding connects branch road, Secondary Winding and connects branch road and switch and being connected of program control source through the branch road relay, at most only exists winding to connect branch road or Secondary Winding on the test branch road simultaneously and connects branch road and obtain with the connection of program control source.
A described winding connects the normally opened contact that the branch road serial connection is once held relay; Secondary Winding connects the normally opened contact of branch road serial connection secondary terminals relay; Once hold being connected between winding that the normally closed contact of relay is used for mutual inductor and the ground; The normally closed contact of secondary terminals relay is used for the Secondary Winding of mutual inductor and the connection between the ground, and described relay, secondary terminals relay, power supply transfer relay and the branch road relay once held realized opening and closing through control module.
All establish the sampling end of current sample module on the connection branch road of described winding connection branch road, Secondary Winding, described sampling module comprises passage switch unit, amplification filtering unit, AC-DC conversion unit, AD conversion unit and the infrared delivery unit that is used for the branch road switching.
The amplification filtering unit of described current sample module is connected with the high-voltage alternating output terminal in program control source with the earth terminal of wave filter.
Described program control source is provided with the voltage sample module, described voltage sample module comprises voltage attenuation unit, amplification filtering unit, AC-DC conversion unit, AD conversion unit, be used for the received current sampling module current digital information infrared receiver and current digital information and voltage digital information is sent to the delivery unit of control module.
Described control module is located in single-chip microcomputer or the PC.
Test unit comprises and is used for the ground plate that is connected with transformer casing that described current sample module is connected with ground plate.
Test unit is provided with 12 test branch roads successively 12 mutual inductors are made an experiment.
Beneficial effect: the test branch road of a plurality of parallel connections carries out from dynamic test the mutual inductor of respective numbers, reduces human factor, effectively enhances productivity; Reduce error; By control module program control source is controlled, the possibility that the minimizing personnel contact with high-tension electricity is guaranteed safety.
Description of drawings
Fig. 1 is the utility model schematic diagram.
Fig. 2 is the utility model current sample module frame chart.
Fig. 3 is the utility model voltage sample module frame chart.
Embodiment
Below in conjunction with Figure of description the technical scheme of the utility model is done further detailed description.
The utility model comprises the program control source 13 that is used to provide High Level AC Voltage and low-voltage DC; The test branch road 1,2,3 of 12 parallel connections that are connected with program control source 13 ... 11,12; With test branch road 1,2,3 ... 11,12 series connection are used to switch the High Level AC Voltage of program control source 13 outputs and the power supply transfer relay T1 of low-voltage DC; Sampling end L1, L2, L3 ... L11, L12; K1, K2, K3 ... K11, K12 are positioned at test branch road 1,2,3 ... 11, the current sample module on 12 is used to control 13 power supplies of program control source and test branch road 1,2,3 ... 11, the control module of 12 work.Described test branch road 1,2,3 ... 11,12 comprise and are used for the Secondary Winding connection branch road once holding the winding that is connected to connect branch road and be used for being connected with the mutual inductor secondary terminals with mutual inductor; Described winding connect branch road, Secondary Winding connect branch road through branch road relay T2 switch with program control source 13 be connected a test branch road 1,2,3 ... 11, at most only existing on 12 winding to connect branch road or Secondary Winding simultaneously connects branch road and obtains with 13 connections of program control source.A described winding connects the branch road serial connection and once holds relay T3, T5 ... The normally opened contact of T23, T25; Secondary Winding connects branch road serial connection secondary terminals relay T4, T6, T8 ... The normally opened contact of T24, T26; Once hold relay T3, T5 ... Be connected secondary terminals relay T4, T6, T8 between winding that the normally closed contact of T23, T25 is used for mutual inductor and the ground ... The normally closed contact of T24, T26 is used for the Secondary Winding of mutual inductor and the connection between the ground; Described relay T3, the T5 of once holding ... T23, T25, secondary terminals relay T4, T6, T8 ... T24, T26, power supply transfer relay T1 and branch road relay T2 all realize opening and closing through control module.Equal parallel-current sampling module on the connection branch road of described winding connection branch road, Secondary Winding.
As shown in Figure 2, described sampling module comprises passage switch unit, amplification filtering unit, AC-DC conversion unit, AD conversion unit and the infrared delivery unit that is used for the branch road switching.The amplification filtering unit of described current sample module is connected with the high-voltage alternating output terminal in program control source 13 with the earth terminal of wave filter.
Described program control source 13 is provided with the voltage sample module; As shown in Figure 3, described voltage sample module comprises voltage attenuation unit, amplification filtering unit, AC-DC conversion unit, AD conversion unit, be used for the received current sampling module current digital information infrared receiver and current digital information and voltage digital information is sent to the delivery unit of control module.Described control module is located in single-chip microcomputer or the PC.Test unit comprises and is used for the ground plate that is connected with transformer casing that described current sample module is connected with ground plate.
In streamline, because transformer casing ground all is connected together, gathers current signal and can not sample, so can only be in high-end sampling, promptly at test branch road 1,2,3 in the bottom ... 11,12 up-samplings.Therefore, sampling is ground altogether not with current channel for instrument internal voltage channel sampling, and voltage channel connects the earth, and what current channel connect is floating ground, and withstand voltage between two ground must be more than 5000V.
When doing winding of withstand voltage test to (Secondary Winding and ground), ten two the road beat simultaneously withstand voltage.Once hold relay T3, T5 ... T23, T25 adhesive, secondary terminals relay T4, T6, T8 ... T24, T26 decontrol, and power supply transfer relay T1 and branch road relay T2 decontrol.Stepup transformer since 0 be raised to setting voltage (being generally 3000V), if survey insulation resistance, power supply transfer relay T1 adhesive, branch road relay T2 decontrols.
U1 is a sampled voltage; L1 goes up to L12 and is sample rate current, if in the process of boosting, there is punch-through to take place, this paths just can break off at once; Reaction time when doing insulation resistance, is each test branch road 1,2,3 less than 30ms. ... 11,12 record successively.
When Secondary Winding was to (the earth) when doing withstand voltage test, ten two the road beat withstand voltagely simultaneously, and winding is floating empty.Secondary terminals relay T4, T6, T8 ... T24, T26 adhesive; Once hold relay T3, T5, T7 .... T23, T25 decontrol; Power supply transfer relay T1 decontrols branch road relay T2 adhesive. same stepup transformer since 0 be raised to setting voltage (being generally 3000V)
If the survey insulation resistance, power supply transfer relay T1, all adhesives of branch road relay T2T2.
U1 is a sampled voltage, and sampling end K1 goes up to K12 and is sample rate current, if in the process of boosting, there is punch-through to take place, this road just can be broken off at once, and the reaction time is less than 30ms.
In the present embodiment, the industrial frequency withstand voltage and the insulation resistance testing device that are used for the automatic calibration streamline mainly are made up of AC and DC Voltage Generator, voltage signal sampling module, current signal sampling module, wiring changeover module etc., control module.
AC and DC Voltage Generator produces and to be used for the alternating voltage (being generally AC3000V) of industrial frequency withstand voltage and the DC voltage (being generally DC500V) that is used for insulation measurement, and the disconnection through power supply transfer relay T1 and branch road relay T2, closed action completion are to winding of tested mutual inductor and the Secondary Winding combined-voltage of exerting pressure respectively.
The voltage signal sampling module is divided into alternating voltage sampling U1 and DC voltage sampling U2, is used to monitor output voltage, makes its arrival and remains on trial voltage value level.The scheme of voltage measurement is as shown in Figure 3; At first tested High AC voltage is decayed to low-voltage signal through classification; BPF. through 50Hz is with the undesired signal filtering; For accurate the measurement needs convert filtered AC signal to direct current signal, and measure its effective value through high-precision AD, the data that record are passed through infrared transmission to cpu controller and host computer.
For d. c. voltage signal also is to measure through high-precision AD through classification decay back, and through the infrared transmission data.
The current signal sampling module is used to measure the Leakage Current of power frequency withstand test and insulation resistance, and Leakage Current all is the mA rank, needs precision measurement.Current signal is to adopt high-end mensuration in the utility model, and current sampling circuit is in high pressure conditions, needs therefore to guarantee that current sampling circuit and earth potential have good insulation performance.Single batch power frequency withstand test and insulation resistance test all are that 12 mutual inductors apply voltage simultaneously, switch the Leakage Current of measuring each mutual inductor successively through 12 passages.Leakage Current is measured the back through bandpass filtering, AC-DC conversion and high-precision AD and is obtained data, and through the infrared signal of uploading.
Because the ground connection of voltage measurement passage is for truly; With mutual inductor body, pressure-resistant apparatus altogether, and the ground connection of current measurement passage is for suspending ground, and the dielectric level of 5000V is arranged between two ground connection; Therefore the result of voltage, electric current uploads and adopts infrared mode, plays good electrical isolation effect.
The wiring changeover module is mainly by once end relay shown in Figure 1 and secondary terminals relay T1 to T26, and totally 26 relays are formed, and accomplish corresponding circuit connection by control module according to different pilot projects.
Subjects is mainly multiple circle formula low-voltage current mutual inductor and bus-type low-voltage current mutual inductor.
The power frequency withstand test of multiple circle formula low-voltage current mutual inductor comprise winding to Secondary Winding and ground connection base plate, Secondary Winding to two of ground connection base plates, insulation resistance test comprise winding to Secondary Winding, Secondary Winding to two of ground connection base plates.
The bus-type low-voltage current mutual inductor only has power frequency withstand test and the insulation resistance test of Secondary Winding to the ground connection base plate.
Therefore, need be carried out different circuit connections by the examination mutual inductor, need to realize winding and Secondary Winding are applied simultaneously the ability of combined-voltage according to different.
As shown in Figure 1, T1 and T2 are in off-state, if with T3, T5 ... T23, T25 closure, T4, T6 ... T24, T26 break off ground connection, then can realize winding power frequency withstand test to Secondary Winding and ground.As closed T1, all the other relay status are constant, then can accomplish winding insulation resistance test to Secondary Winding and ground.
In like manner, when the T1 disconnection, T2 is closed, T4, T6 ... T24, T26 closure, T3, T5 ... T23, T25 break off, and can accomplish Secondary Winding power frequency withstand test over the ground.T1 is closed, T2 is closed, all the other states are constant, can accomplish Secondary Winding insulation measurement over the ground.
In the measuring process, sampling end L1, L2 ... L11, L12 or K1, K2 ... K11, K12 also switch through relay, have only one to be inserted the measurement loop.
Claims (9)
1. current transformer industrial frequency withstand voltage and insulation resistance testing device; It is characterized in that: comprise the program control source (13) that is used to provide High Level AC Voltage and low-voltage DC, be connected the test branch road (1,2,3 of a plurality of parallel connections of thinking winding of mutual inductor or Secondary Winding power supply with program control source (13) ... 11,12), with test branch road (1,2,3 ... 11,12) series connection is used to switch the High Level AC Voltage of program control source (13) output and power supply transfer relay (T1), sampling end (L1, L2, the L3 of low-voltage DC ... L11, L12, K1, K2, K3 ... K11, K12) be positioned at and test branch road (1,2,3 ... 11, the current sample module 12), be used to control program control source (13) power supply and test branch road (1,2,3 ... 11, the 12) control module of work.
2. current transformer industrial frequency withstand voltage according to claim 1 and insulation resistance testing device; It is characterized in that: described test branch road (1,2,3 ... 11,12) comprise that the Secondary Winding that is used for once holding the winding that is connected to connect branch road with mutual inductor and is used for being connected with the mutual inductor secondary terminals connects branch road, a described winding connects branch road, Secondary Winding connection branch road and switches and being connected of program control source (13) through branch road relay (T2).
3. current transformer industrial frequency withstand voltage according to claim 2 and insulation resistance testing device; It is characterized in that: a described winding connects the branch road serial connection and once holds relay (T3, T5 ... T23, T25) normally opened contact; Secondary Winding connects branch road serial connection secondary terminals relay (T4, T6, T8 ... T24, T26) normally opened contact; Once hold relay (T3, T5 ... T23, T25) normally closed contact winding being used for mutual inductor and ground between be connected; Secondary terminals relay (T4, T6, T8 ... T24, T26) normally closed contact be used for the Secondary Winding of mutual inductor and the connection between the sampling end; Described relay (T3, the T5 of once holding ... T23, T25), secondary terminals relay (T4, T6, T8 ... T24, T26), power supply transfer relay (T1) and branch road relay (T2) realize opening and closing a test branch road (1,2,3 through control module ... 11,12) upward at most only existing simultaneously a winding to connect branch road or Secondary Winding connection branch road and program control source (13) connects and gets.
4. current transformer industrial frequency withstand voltage according to claim 3 and insulation resistance testing device; It is characterized in that: a described winding connects branch road, Secondary Winding connects sampling end (L1, L2, the L3 that all establishes the current sample module on the branch road ... L11, L12; K1, K2, K3 ... K11, K12), described sampling module comprises passage switch unit, amplification filtering unit, AC-DC conversion unit, AD conversion unit and the infrared delivery unit that is used for the branch road switching.
5. current transformer industrial frequency withstand voltage according to claim 4 and insulation resistance testing device is characterized in that: the amplification filtering unit of described current sample module is connected with the high-voltage alternating output terminal of the earth terminal of wave filter with program control source (13).
6. current transformer industrial frequency withstand voltage according to claim 5 and insulation resistance testing device; It is characterized in that: described program control source (13) is provided with the voltage sample module, described voltage sample module comprises voltage attenuation unit, amplification filtering unit, AC-DC conversion unit, AD conversion unit, be used for the received current sampling module current digital information infrared receiver and current digital information and voltage digital information is sent to the delivery unit of control module.
7. current transformer industrial frequency withstand voltage according to claim 6 and insulation resistance testing device is characterized in that: described control module is located in single-chip microcomputer or the PC.
8. current transformer industrial frequency withstand voltage according to claim 1 and insulation resistance testing device is characterized in that: test unit comprises and is used for the ground plate that is connected with transformer casing that described current sample module is connected with ground plate.
9. according to described current transformer industrial frequency withstand voltage of the arbitrary claim of claim 1-8 and insulation resistance testing device, it is characterized in that: test unit is provided with 12 test branch roads (1,2,3 ... 11,12) successively 12 mutual inductors are made an experiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203428696U CN202177693U (en) | 2011-09-14 | 2011-09-14 | Industrial frequency withstand voltage and insulation resistance testing apparatus for current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203428696U CN202177693U (en) | 2011-09-14 | 2011-09-14 | Industrial frequency withstand voltage and insulation resistance testing apparatus for current transformer |
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| CN202177693U true CN202177693U (en) | 2012-03-28 |
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| CN2011203428696U Expired - Lifetime CN202177693U (en) | 2011-09-14 | 2011-09-14 | Industrial frequency withstand voltage and insulation resistance testing apparatus for current transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105022016A (en) * | 2015-06-23 | 2015-11-04 | 国网辽宁省电力有限公司检修分公司 | Quick zero-flux current transformer test wiring device and use method |
| CN106771782A (en) * | 2017-02-10 | 2017-05-31 | 国家电网公司 | A kind of experimental rig and method for simulating distinct device insulaion resistance and absorption process |
| CN109100619A (en) * | 2017-06-21 | 2018-12-28 | 北京振兴计量测试研究所 | A kind of isolator detection system and method |
| CN113567799A (en) * | 2021-09-28 | 2021-10-29 | 广东电网有限责任公司中山供电局 | 10kV capacitor integrated test device and test method thereof |
-
2011
- 2011-09-14 CN CN2011203428696U patent/CN202177693U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105022016A (en) * | 2015-06-23 | 2015-11-04 | 国网辽宁省电力有限公司检修分公司 | Quick zero-flux current transformer test wiring device and use method |
| CN106771782A (en) * | 2017-02-10 | 2017-05-31 | 国家电网公司 | A kind of experimental rig and method for simulating distinct device insulaion resistance and absorption process |
| CN106771782B (en) * | 2017-02-10 | 2024-03-22 | 国家电网公司 | Test device and method capable of simulating insulation resistance and absorption process of different equipment |
| CN109100619A (en) * | 2017-06-21 | 2018-12-28 | 北京振兴计量测试研究所 | A kind of isolator detection system and method |
| CN109100619B (en) * | 2017-06-21 | 2020-06-26 | 北京振兴计量测试研究所 | Microwave insulator detection system and method |
| CN113567799A (en) * | 2021-09-28 | 2021-10-29 | 广东电网有限责任公司中山供电局 | 10kV capacitor integrated test device and test method thereof |
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