CN104166115A - Signal detection device of capacitive equipment electrified tester - Google Patents
Signal detection device of capacitive equipment electrified tester Download PDFInfo
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- CN104166115A CN104166115A CN201410419350.1A CN201410419350A CN104166115A CN 104166115 A CN104166115 A CN 104166115A CN 201410419350 A CN201410419350 A CN 201410419350A CN 104166115 A CN104166115 A CN 104166115A
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Abstract
The invention provides a signal detection device of a capacitive equipment electrified tester. The signal detection device comprises a low-voltage transformer, a first fixed detection closed circuit, a second fixed detection closed circuit, a third fixed detection closed circuit, a fourth fixed detection closed circuit and an adjustable detection closed circuit, wherein the first fixed detection closed circuit, the second fixed detection closed circuit, the third fixed detection closed circuit and the fourth fixed detection closed circuit are respectively composed of a precise capacitor and a resistor, and the adjustable detection closed circuit is composed of a precise capacitor and an adjustable resistor. Signal output contains four common capacitive equipment status value gears and one adjustable output signal value gear, and therefore precision detection and functionality detection of the capacitive equipment electrified tester can be realized. The low-cost electric elements can provide multiple capacitive equipment signal imitation sources, meanwhile, the components of the signal detection device are small in size, so that the signal detection device is small in size too, and the signal detection device has the advantages of being small, portable, low in production cost and high in safety.
Description
Technical field
The present invention relates to the technical field of power equipment test, particularly relate to a kind of signal verification device of capacitive apparatus testing instrument for electrified.
Background technology
In electrical network, the live testing work of various capacitive apparatus is generally carried out at present, and capacitive apparatus testing instrument for electrified also becomes the common instrument of maintenance, but owing to there is no at present the calibration equipment of such instrument, before use, cannot check it whether can normally work, thereby occur that sometimes tester arrives behind testing ground, because the inaccurate situation of cancelling the production schedule cannot be measured or measure to instrument.
If can test to capacitive apparatus testing instrument for electrified in advance before use, can avoid the generation of above-mentioned situation.Realize the inspection to capacitive apparatus testing instrument for electrified, the capacitive apparatus signal imitation source of a known signal size must be provided, and at present the simulation of capacitive apparatus signal is mainly contained to two kinds, a kind of is to simulate the signal identical with field condition by high-pressure process, which needs expensive cost of equipment, another kind is by digital simulation low-voltage signal, and which needs higher development cost.Therefore, need to work out a kind of signal verification device that can meet examination requirements and can dwindle again cost.
Summary of the invention
For the higher problem of the inspection machine cost of existing capacitive apparatus testing instrument for electrified, the invention provides a kind of signal verification device of capacitive apparatus testing instrument for electrified, by lower-cost force device, multiple capacitive apparatus signal imitations source can be provided, reduce costs.
A signal verification device for capacitive apparatus testing instrument for electrified, comprising:
Low-tension transformer, the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path;
The high voltage input terminal of described low-tension transformer is used for connecting input power, and its low-voltage output connects respectively described the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path;
Described the first fixed test path comprises a RC phase-shift circuit and first signal output terminal, and the low-voltage output of described low-tension transformer is connected to described first signal output terminal after a described RC phase-shift circuit;
Described the second fixed test path comprises the 2nd RC phase-shift circuit and secondary signal output terminal, and the low-voltage output of described low-tension transformer is connected to described secondary signal output terminal after described the 2nd RC phase-shift circuit;
Described the 3rd fixed test path comprises the 3rd RC phase-shift circuit and the 3rd signal output part, and the low-voltage output of described low-tension transformer is connected to described the 3rd signal output part after described the 3rd RC phase-shift circuit;
Described the 4th fixed test path comprises the 4th RC phase-shift circuit and the 4th signal output part, and the low-voltage output of described low-tension transformer is connected to described the 4th signal output part after described the 4th RC phase-shift circuit;
Described adjustable detection path comprises accurate electric capacity, variohm and the 5th signal output part, and the low-voltage output of described low-tension transformer is connected to described the 5th signal output part successively after described accurate electric capacity and described variohm.
The signal verification device of capacitive apparatus testing instrument for electrified of the present invention, form the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path by low-tension transformer, accurate electric capacity, resistance and variohm, signal output packet has contained 4 common capacitive apparatus state value shelves, and 1 adjustable output signal value shelves, can meet accuracy test and functional inspection to capacitive apparatus testing instrument for electrified.Because the formation original paper volume of this signal verification device is all smaller, therefore the volume of himself is also very little, there is small volume and less weight, production cost is low, safe.
Brief description of the drawings
Fig. 1 is the structural representation of the signal verification device of capacitive apparatus testing instrument for electrified of the present invention;
Fig. 2 is the structural representation of a kind of preferred implementation of signal verification device of capacitive apparatus testing instrument for electrified of the present invention;
Fig. 3 is the detailed circuit structural representation of a kind of preferred implementation of signal verification device of capacitive apparatus testing instrument for electrified of the present invention.
Embodiment
Refer to Fig. 1, Fig. 1 is the structural representation of the signal verification device of capacitive apparatus testing instrument for electrified of the present invention.
The signal verification device 10 of described capacitive apparatus testing instrument for electrified comprises:
Low-tension transformer 100, the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path;
The high voltage input terminal of described low-tension transformer 100 is used for connecting input power, and its low-voltage output connects respectively described the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path;
Described the first fixed test path comprises a RC phase-shift circuit 111 and first signal output terminal 112, and the low-voltage output of described low-tension transformer 100 is connected to described first signal output terminal 112 after a described RC phase-shift circuit 111;
Described the second fixed test path comprises the 2nd RC phase-shift circuit 121 and secondary signal output terminal 122, and the low-voltage output of described low-tension transformer 100 is connected to described secondary signal output terminal 122 after described the 2nd RC phase-shift circuit 121;
Described the 3rd fixed test path comprises the 3rd RC phase-shift circuit 131 and the 3rd signal output part 132, and the low-voltage output of described low-tension transformer 100 is connected to described the 3rd signal output part 132 after described the 3rd RC phase-shift circuit 131;
Described the 4th fixed test path comprises the 4th RC phase-shift circuit 141 and the 4th signal output part 142, and the low-voltage output of described low-tension transformer 100 is connected to described the 4th signal output part 142 after described the 4th RC phase-shift circuit 141;
Described adjustable detection path comprises accurate electric capacity 151, variohm 152 and the 5th signal output part 153, and the low-voltage output of described low-tension transformer 100 is connected to described the 5th signal output part 153 successively after described accurate electric capacity 151 and described variohm 152.
Common capacitive apparatus testing instrument for electrified generally has two kinds of measurement patterns, relative measurement pattern and absolute measurement pattern, and relative measurement pattern is taking electric current as reference signal, and absolute measurement pattern is taking voltage as reference signal.
This device is by being powered by 220V power frequency supply, preferably, the low-tension transformer that described low-tension transformer is 220V/57.7V, its high voltage input terminal connects the AC power of 220V, the output voltage of its low-voltage output output 57.7V, for simulating the PT secondary voltage of capacitive apparatus.Described first to fourth fixed test path can be exported respectively 4 common capacitive apparatus state value shelves, and it is made up of 4 groups of different accurate RC phase-shift circuits, and output signal has higher accuracy guarantee, can be used as accuracy test; Exportable 1 the adjustable output signal value shelves of described adjustable detection path, it is made up of accurate electric capacity and variohm, only need, by regulating variohm can change electric current and the dielectric loss of output signal, can be used as functional inspection.Preferably, the rated voltage of described first to fourth accurate electric capacity is 63V, and temperature coefficient is in-200 ± 100 (ppm/ DEG C), and capacitance tolerance is in ± 1%, and dielectric loss is less than or equal to 5 × 10-4.
Described variohm comprises: slide rheostat, thermistor, photoresistance, voltage dependent resistor (VDR) and gas sensing resistance.
In the time that the signal verification device that uses capacitive apparatus testing instrument for electrified of the present invention is tested to relative measurement pattern, only need be in the first to the 5th signal output part an optional output port, the reference channel of capacitive apparatus testing instrument for electrified is connected and accessed this port with measurement passage, now reference signal and measuring-signal are same signal, the measured dielectric loss difference of capacitive apparatus testing instrument for electrified should be 0, capacitance ratio should be 1, the output current that Leakage Current value marks for corresponding port, if the error of the numerical value that the measurement numerical value of capacitive apparatus marks with respect to corresponding port in allowed limits, illustrate that this capacitive apparatus testing instrument for electrified is qualified.
In the present embodiment, the signal verification device of described capacitive apparatus testing instrument for electrified also can comprise:
Regulating circuit module 154, described regulating circuit module 154 is connected with the variohm 152 in described adjustable detection path, for regulate the operating resistance of described variohm 152 according to input instruction.
By described regulating circuit module, can realize the operating resistance of described variohm 152 is regulated neatly.Described variohm 152 comprises: slide rheostat, thermistor, photoresistance, voltage dependent resistor (VDR) and gas sensing resistance.Therefore described regulating circuit module 154 can corresponding arrange the adjusting of the modes such as corresponding machinery, temperature-sensitive, photosensitive, pressure-sensitive and air-sensitive, to reach best regulating effect.
The signal verification device of capacitive apparatus testing instrument for electrified of the present invention, form the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path by low-tension transformer, accurate electric capacity, resistance and variohm, signal output packet has contained 4 common capacitive apparatus state value shelves, and 1 adjustable output signal value shelves, can meet accuracy test and functional inspection to capacitive apparatus testing instrument for electrified.Because the formation original paper volume of this signal verification device is all smaller, therefore the volume of himself is also very little, there is small volume and less weight, production cost is low, safe.
Refer to Fig. 2, Fig. 2 is the structural representation of a kind of preferred implementation of signal verification device of capacitive apparatus testing instrument for electrified of the present invention.
In the present embodiment, the signal verification device of described capacitive apparatus testing instrument for electrified also comprises:
The 6th signal output part 160, described the 6th signal output part 160 connects the low-voltage output of described low-tension transformer 100.
In present embodiment, by described the 6th signal output part 160 is set, connect the low-voltage output of described low-tension transformer, the output voltage that is described low-tension transformer that described the 6th signal output part 160 is exported.The secondary voltage that can direct modeling goes out capacitive apparatus by low-tension transformer 100, is used as the inspection of the absolute method of measurement.In conjunction with described the 6th signal output part 160 and described first to fourth fixed test path and described adjustable detection path, can test to the absolute measurement pattern of capacitive apparatus testing instrument for electrified.
In the time that absolute measurement pattern is tested, only the reference channel of capacitive apparatus testing instrument for electrified need be received on described the 6th signal output part 16, be connected to any output port in first to fourth fixed test path or described adjustable detection path by measuring passage, suppose to measure passage and receive described first signal output terminal 112, now the measured dielectric loss value of capacitive apparatus testing instrument for electrified should be the dielectric loss value that described first signal output terminal 112 marks, the output current I1 that Leakage Current value marks for described first signal output terminal 112, reference voltage is 57.7V, if the error of the numerical value that the measurement numerical value of capacitive apparatus marks with respect to described first signal output terminal 112 in allowed limits, illustrate that this capacitive apparatus testing instrument for electrified is qualified.
Refer to Fig. 3, Fig. 3 is the detailed circuit structural representation of a kind of preferred implementation of signal verification device of capacitive apparatus testing instrument for electrified of the present invention.
In the present embodiment, the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path are parallel to the low-voltage output of low-tension transformer T1;
A described RC phase-shift circuit comprises the first accurate capacitor C 1 and the first fixed resistance R1, and the low-voltage output of described low-tension transformer T1 is connected to described first signal output terminal CX1 successively after described the first accurate capacitor C 1 and described the first fixed resistance R1;
Described the 2nd RC phase-shift circuit comprises the second accurate capacitor C 2 and the second fixed resistance R2, and the low-voltage output of described low-tension transformer T1 is connected to described secondary signal output terminal CX2 successively after described the second accurate capacitor C 2 and described the second fixed resistance R2;
Described the 3rd RC phase-shift circuit comprises the 3rd accurate capacitor C 3 and the 3rd fixed resistance R3, and the low-voltage output of described low-tension transformer T1 is connected to described the 3rd signal output part CX3 successively after described the 3rd accurate capacitor C 3 and described the 3rd fixed resistance R3;
Described the 4th RC phase-shift circuit comprises the 4th accurate capacitor C 4 and the 4th fixed resistance R4, and the low-voltage output of described low-tension transformer T1 is connected to described the 4th signal output part CX4 successively after described the 4th accurate capacitor C 4 and described the 4th fixed resistance R4.
Described adjustable detection path comprises the 5th accurate capacitor C 5 and variohm R5, and the low-voltage output of described low-tension transformer T1 is connected to described the 5th signal output part CX5 successively after described the 5th accurate capacitor C 5 and described variohm R5.
In the present embodiment, adopt conventional accurate electric capacity and resistance (device) to set up RC phase-shift circuit, the cost degradation of having realized device, in the case of meeting the examination requirements of capacitive apparatus testing instrument for electrified, has also ensured the general applicability of check test.
In the present embodiment, further, also comprise that the 6th signal output part PT is in parallel with described adjustable detection path.Described the 6th signal output part PT is connected in parallel on the low-voltage output of described low-tension transformer, the output voltage that is described low-tension transformer T1 of output voltage.The secondary voltage that can direct modeling goes out capacitive apparatus by low-tension transformer T1, does the inspection of the absolute method of measurement.
The signal verification device of capacitive apparatus testing instrument for electrified of the present invention can adopt the most common 220V power frequency supply as signal source, make the inspection of capacitive apparatus testing instrument for electrified convenient, not only be confined in laboratory, immediately found at use scene that tester has extremely, only need find a 220V power supply to test to tester by this device.Realize the simple accuracy test to tester by first to fourth fixed signal output port, realize the functional inspection to tester by adjustable signal output port, realize the variation of the output signal of the 5th signal output part by Signal Regulation button.Shift to circuit and realized function and the accuracy test of capacitive apparatus testing instrument for electrified by power frequency supply and simple RC.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a signal verification device for capacitive apparatus testing instrument for electrified, is characterized in that, comprising:
Low-tension transformer, the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path;
The high voltage input terminal of described low-tension transformer is used for connecting input power, and its low-voltage output connects respectively described the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path;
Described the first fixed test path comprises a RC phase-shift circuit and first signal output terminal, and the low-voltage output of described low-tension transformer is connected to described first signal output terminal after a described RC phase-shift circuit;
Described the second fixed test path comprises the 2nd RC phase-shift circuit and secondary signal output terminal, and the low-voltage output of described low-tension transformer is connected to described secondary signal output terminal after described the 2nd RC phase-shift circuit;
Described the 3rd fixed test path comprises the 3rd RC phase-shift circuit and the 3rd signal output part, and the low-voltage output of described low-tension transformer is connected to described the 3rd signal output part after described the 3rd RC phase-shift circuit;
Described the 4th fixed test path comprises the 4th RC phase-shift circuit and the 4th signal output part, and the low-voltage output of described low-tension transformer is connected to described the 4th signal output part after described the 4th RC phase-shift circuit;
Described adjustable detection path comprises accurate electric capacity, variohm and the 5th signal output part, and the low-voltage output of described low-tension transformer is connected to described the 5th signal output part successively after described accurate electric capacity and described variohm.
2. the signal verification device of capacitive apparatus testing instrument for electrified as claimed in claim 1, is characterized in that:
Described the first fixed test path, the second fixed test path, the 3rd fixed test path, the 4th fixed test path and adjustable detection path are parallel to the low-voltage output of described low-tension transformer;
A described RC phase-shift circuit comprises the first accurate electric capacity and the first fixed resistance, and the low-voltage output of described low-tension transformer is connected to described first signal output terminal successively after described the first accurate electric capacity and described the first fixed resistance;
Described the 2nd RC phase-shift circuit comprises the second accurate electric capacity and the second fixed resistance, and the low-voltage output of described low-tension transformer is connected to described secondary signal output terminal successively after described the second accurate electric capacity and described the second fixed resistance;
Described the 3rd RC phase-shift circuit comprises the 3rd accurate electric capacity and the 3rd fixed resistance, and the low-voltage output of described low-tension transformer is connected to described the 3rd signal output part successively after described the 3rd accurate electric capacity and described the 3rd fixed resistance;
Described the 4th RC phase-shift circuit comprises the 4th accurate electric capacity and the 4th fixed resistance, and the low-voltage output of described low-tension transformer is connected to described the 4th signal output part successively after described the 4th accurate electric capacity and described the 4th fixed resistance.
3. the signal verification device of capacitive apparatus testing instrument for electrified as claimed in claim 1, is characterized in that:
The rated voltage of described first to fourth accurate electric capacity is 63V, and temperature coefficient is in-200 ± 100 (ppm/ DEG C), and capacitance tolerance is in ± 1%, and dielectric loss is less than or equal to 5 × 10-4.
4. the signal verification device of the capacitive apparatus testing instrument for electrified as described in claims 1 to 3 any one, is characterized in that, the signal verification device of described capacitive apparatus testing instrument for electrified also comprises:
The 6th signal output part, described the 6th signal output part connects the low-voltage output of described low-tension transformer.
5. the signal verification device of capacitive apparatus testing instrument for electrified as claimed in claim 4, is characterized in that: described the 6th signal output part is in parallel with described adjustable detection path.
6. the signal verification device of the capacitive apparatus testing instrument for electrified as described in claims 1 to 3 any one, is characterized in that, the signal verification device of described capacitive apparatus testing instrument for electrified also comprises:
Regulating circuit module, described regulating circuit module is connected with the variohm in described adjustable detection path, for regulate the operating resistance of described variohm according to input instruction.
7. the signal verification device of the capacitive apparatus testing instrument for electrified as described in claims 1 to 3 any one, is characterized in that, described variohm comprises: slide rheostat, thermistor, photoresistance, voltage dependent resistor (VDR) and gas sensing resistance.
8. the signal verification device of the capacitive apparatus testing instrument for electrified as described in claims 1 to 3 any one, is characterized in that, the high voltage input terminal of described low-tension transformer is for connecting the AC power of 220V, and its low-voltage output is exported the output voltage of 57.7V.
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| CN201410419350.1A CN104166115B (en) | 2014-08-22 | 2014-08-22 | The signal verification device of capacitive apparatus testing instrument for electrified |
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| CN201410419350.1A CN104166115B (en) | 2014-08-22 | 2014-08-22 | The signal verification device of capacitive apparatus testing instrument for electrified |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2099319U (en) * | 1990-05-12 | 1992-03-18 | 罗卓林 | Leak current detector for metallic oxide lightning arrester |
| US20040124850A1 (en) * | 2002-12-31 | 2004-07-01 | Koneru Surya N. | Calibration circuit for current source and on-die terminations |
| RU2244319C1 (en) * | 2003-05-05 | 2005-01-10 | Пензенский государственный университет | Device for calibration testing instrument current transformer |
| CN201311488Y (en) * | 2009-03-02 | 2009-09-16 | 南京卓实电气有限责任公司 | Check meter of arrester leakage current and action recorder |
| CN201903637U (en) * | 2010-11-29 | 2011-07-20 | 江苏省电力公司苏州供电公司 | Checking instrument for monitoring discharge counter on line |
| CN202189141U (en) * | 2010-12-31 | 2012-04-11 | 保定天威集团有限公司 | Calibrator for partial discharge detection equipment |
| CN202870285U (en) * | 2012-06-26 | 2013-04-10 | 中国西电电气股份有限公司 | A portable simulation detection device of high-voltage live display apparatuses |
| CN103076584A (en) * | 2012-12-28 | 2013-05-01 | 中国西电电气股份有限公司 | Automatic calibration method and automatic calibration system of noise immunity generator |
| CN103336260A (en) * | 2013-05-29 | 2013-10-02 | 国家电网公司 | System for checking voltage transformer in GIS (gas insulated switchgear) |
| CN203502580U (en) * | 2013-10-12 | 2014-03-26 | 上海思创电器设备有限公司 | Checking system for online insulation monitoring device |
| CN204009035U (en) * | 2014-08-22 | 2014-12-10 | 广州供电局有限公司 | The signal verification device of capacitive apparatus testing instrument for electrified |
-
2014
- 2014-08-22 CN CN201410419350.1A patent/CN104166115B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2099319U (en) * | 1990-05-12 | 1992-03-18 | 罗卓林 | Leak current detector for metallic oxide lightning arrester |
| US20040124850A1 (en) * | 2002-12-31 | 2004-07-01 | Koneru Surya N. | Calibration circuit for current source and on-die terminations |
| RU2244319C1 (en) * | 2003-05-05 | 2005-01-10 | Пензенский государственный университет | Device for calibration testing instrument current transformer |
| CN201311488Y (en) * | 2009-03-02 | 2009-09-16 | 南京卓实电气有限责任公司 | Check meter of arrester leakage current and action recorder |
| CN201903637U (en) * | 2010-11-29 | 2011-07-20 | 江苏省电力公司苏州供电公司 | Checking instrument for monitoring discharge counter on line |
| CN202189141U (en) * | 2010-12-31 | 2012-04-11 | 保定天威集团有限公司 | Calibrator for partial discharge detection equipment |
| CN202870285U (en) * | 2012-06-26 | 2013-04-10 | 中国西电电气股份有限公司 | A portable simulation detection device of high-voltage live display apparatuses |
| CN103076584A (en) * | 2012-12-28 | 2013-05-01 | 中国西电电气股份有限公司 | Automatic calibration method and automatic calibration system of noise immunity generator |
| CN103336260A (en) * | 2013-05-29 | 2013-10-02 | 国家电网公司 | System for checking voltage transformer in GIS (gas insulated switchgear) |
| CN203502580U (en) * | 2013-10-12 | 2014-03-26 | 上海思创电器设备有限公司 | Checking system for online insulation monitoring device |
| CN204009035U (en) * | 2014-08-22 | 2014-12-10 | 广州供电局有限公司 | The signal verification device of capacitive apparatus testing instrument for electrified |
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Effective date of registration: 20200917 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
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