CN204575773U - The impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response - Google Patents

The impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response Download PDF

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Publication number
CN204575773U
CN204575773U CN201520286343.9U CN201520286343U CN204575773U CN 204575773 U CN204575773 U CN 204575773U CN 201520286343 U CN201520286343 U CN 201520286343U CN 204575773 U CN204575773 U CN 204575773U
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China
Prior art keywords
frequency
impedance
amplitude
transformer substation
observing
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CN201520286343.9U
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Chinese (zh)
Inventor
司文荣
傅晨钊
林一
祝达康
黄华
杨凌辉
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Shanghai Energy Saving Service Co., Ltd.
State Grid Shanghai Municipal Electric Power Co
East China Power Test and Research Institute Co Ltd
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State Grid Shanghai Municipal Electric Power Co
East China Power Test and Research Institute Co Ltd
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Abstract

The utility model relates to the impedance of a kind of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response, comprises swept-frequency signal and occurs, stores and signal transmitting apparatus, data collector, observing and controlling analysis and display device and printout module; Described observing and controlling analysis and display device occur with swept-frequency signal respectively, store and signal transmitting apparatus, data collector and printout model calling.Compared with prior art, the utility model has simply, accurately and not by the advantage such as restriction of on-the-spot service condition.

Description

The impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response
Technical field
The utility model relates to a kind of transformer station checkout equipment, especially relates to the impedance of a kind of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response.
Background technology
Grounding net of transformer substation is the critical facility guaranteeing electrical equipment and personal safety.Because grounded screen is embedded in underground, often because of soil corrosion for many years, cause grounding body to attenuate and even rupture, make Grounding performance depreciation.At present, engineering is generally judged by power frequency earthing resistance indirectly to the detection of Grounding performance quality, but the corrosion condition of grounded screen cannot be understood.As long as because the grounding body of measured place open circuit does not occur, even if grounded screen is by heavy corrosion, power frequency earthing resistance also can reach regulatory requirements usually.So engineering is all generally after finding that earth mat power frequency earthing resistance is defective or the accident that causes due to ground network defect occurs, search grounded screen breakpoint and corrosion section by dig on a wide area, this method of work is with blindness, and workload is very big.
In addition, it is 50Hz or close to the power-frequency earthing resistance value under 50Hz that at present conventional power frequency earthing resistance tests the impedance ground value obtained, but be in fact short-circuited in transformer station earth fault, or under Lightning Incoming Wave or operation ripple effect, the transient state Transient grounding resistance of grounded screen plays a decisive role.Therefore only measure power-frequency earthing impedance can not represent grounding net of transformer substation can safe operation under fault condition.
Utility model content
The purpose of this utility model be exactly in order to overcome above-mentioned prior art exist defect and the impedance of a kind of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response are provided.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of grounding net of transformer substation frequency sweep impedance and the automatic test diagnosis equipment of amplitude-frequency response, is characterized in that, comprises swept-frequency signal and occur, store and signal transmitting apparatus, data collector, observing and controlling analysis and display device and printout module; Described observing and controlling analysis and display device occur with swept-frequency signal respectively, store and signal transmitting apparatus, data collector and printout model calling.
Described swept-frequency signal occurs, storage comprises with signal transmitting apparatus the sweep generator and power amplifier that are connected successively, described sweep generator is connected with observing and controlling analysis and display device, and described power amplifier is connected with data collector.
Described sweep generator is 10-100kHz sweep generator.
Described data collector comprises sampling resistor, Luo-coil and data acquisition unit, described data acquisition unit comprises data acquisition storage and output circuit, communication and control circuit and power-switching circuit, described data acquisition storage is connected with sampling resistor, Luo-coil, communication and control circuit and power-switching circuit respectively with output circuit, described power-switching circuit is connected with communication and control circuit, and described communication and control circuit are connected with power amplifier, observing and controlling analysis and display device respectively.
Described observing and controlling analysis is connected with sweep generator by USB with display device, described observing and controlling analysis is connected with data collector by USB with display device, and described observing and controlling analysis and display device are by TCP/IP network and printout model calling.
Described observing and controlling analysis and display device are notebook computer or industrial computer.
Described printout module is printer.
Compared with prior art, the utility model when not having a power failure and do not excavate earth mat, can understand the running status of grounded screen, judges whether grounded screen corrodes, ensures safety, the reliability service of electric system.And there is the advantages such as the restriction simply, accurately and not being subject to on-the-spot service condition
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein 1 is sweep generator, and 2 is power amplifier, and 3 is data acquisition unit, and 4 is host computer, and 5 is printer, and 6 is grounded screen, and 7 is down conductor, and 8 is sampling resistor, and 9 is Luo-coil, and 10 is voltage ground pole, a distant place.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment
As shown in Figure 1, enter a transformer station, selected this grounding net of transformer substation 61# main transformer earthing bar downlead 7 is swept-frequency signal input end in, according to grounded screen catercorner length according to DL/T475-2006 electric discharge pressure p-wire voltage ground pole 10 afield.Swept-frequency signal input end in and voltage pole p-wire are connected to power amplifier 2.Select wiretap arrester ground row downlead 7 as swept-frequency signal output terminal out.Swept-frequency signal input end in, swept-frequency signal output terminal out are connected to sampling resistor 8, and the Luo-coil that the corresponding down conductor of swept-frequency signal input end in is nested with totally three road voltage signals be connected to data acquisition unit 3.Host computer 4 is connected with sweep generator 1, data acquisition unit 3 by USB interface.The major parameters such as frequency swept signal, frequency interval and amplitude are exported, the sampling rate under the corresponding operating mode of setting data collecting unit 3 by arranging sweep generator 2 in host computer 4.Relevant connection and setting completed, test record also carries out computation and analysis, draws grounded screen frequency sweep impedance curve R (f) and grounded screen 2 selected down conductors amplitude-frequency response H (f) as input and output; Grounded screen running status and extent of corrosion can be assessed with the related coefficient size of history curve H (f) ' according to current frequency sweep impedance variation and current amplitude-frequency response H (f).
The utility model outstanding behaviours business characteristic of the automatic testing and diagnosing of grounding net of transformer substation, utilizes the detection means of electronization to instead of manual detection, enormously simplify means of testing, improve detection efficiency.
In the utility model case study on implementation, sweep generator 1, power amplifier 2, data acquisition unit 3 and host computer 4 all make use of built-in high-capacity direct galvanic battery, also all can utilize ready-made 220V external power source.
The frequency sweep impedance of the utility model grounding net of transformer substation and the automatic test diagnosis equipment host computer 4 of amplitude-frequency response carry out online or off-line carries out computational analysis, generate chart and also export.
System follows open criterion, enjoys maximum data and gather robotization and grounded screen state analysis system under the environment that user is used in reality.In the present system, the opening of system shows the open nature of data acquisition system (DAS), data base management system (DBMS) and applied analysis system, have employed communication standard usb protocol alternately between data.
The foregoing is only specific embodiment of the utility model, but technical characteristic of the present utility model is not limited thereto, any those skilled in the art is again in field of the present utility model, and the change done or modify all is encompassed in the scope of the claims of the present utility model.

Claims (7)

1. the impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response, is characterized in that, comprises swept-frequency signal and occur, store and signal transmitting apparatus, data collector, observing and controlling analysis and display device and printout module; Described observing and controlling analysis and display device occur with swept-frequency signal respectively, store and signal transmitting apparatus, data collector and printout model calling.
2. a kind of grounding net of transformer substation frequency sweep according to claim 1 impedance and the automatic test diagnosis equipment of amplitude-frequency response, it is characterized in that, described swept-frequency signal occurs, storage comprises with signal transmitting apparatus the sweep generator and power amplifier that are connected successively, described sweep generator is connected with observing and controlling analysis and display device, and described power amplifier is connected with data collector.
3. a kind of grounding net of transformer substation frequency sweep according to claim 2 impedance and the automatic test diagnosis equipment of amplitude-frequency response, is characterized in that, described sweep generator is 10-100kHz sweep generator.
4. a kind of grounding net of transformer substation frequency sweep according to claim 2 impedance and the automatic test diagnosis equipment of amplitude-frequency response, it is characterized in that, described data collector comprises sampling resistor, Luo-coil and data acquisition unit, described data acquisition unit comprises data acquisition storage and output circuit, communication and control circuit, and power-switching circuit, described data acquisition storage and output circuit respectively with sampling resistor, Luo-coil, communication is connected with control circuit and power-switching circuit, described power-switching circuit is connected with communication and control circuit, described communication and control circuit respectively with power amplifier, observing and controlling analysis is connected with display device.
5. a kind of grounding net of transformer substation frequency sweep according to claim 2 impedance and the automatic test diagnosis equipment of amplitude-frequency response, it is characterized in that, described observing and controlling analysis is connected with sweep generator by USB with display device, described observing and controlling analysis is connected with data collector by USB with display device, and described observing and controlling analysis and display device are by TCP/IP network and printout model calling.
6. a kind of grounding net of transformer substation frequency sweep according to claim 1 impedance and the automatic test diagnosis equipment of amplitude-frequency response, is characterized in that, described observing and controlling analysis and display device are notebook computer or industrial computer.
7. a kind of grounding net of transformer substation frequency sweep according to claim 1 impedance and the automatic test diagnosis equipment of amplitude-frequency response, is characterized in that, described printout module is printer.
CN201520286343.9U 2015-05-05 2015-05-05 The impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response Active CN204575773U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105652139A (en) * 2015-12-30 2016-06-08 国家电网公司 Method for testing conductivity of grounding grid
CN106771625A (en) * 2017-02-28 2017-05-31 国网陕西省电力公司电力科学研究院 A kind of frequency sweep impedance test system of low-power consumption
CN108872793A (en) * 2018-07-19 2018-11-23 西安交通大学 DC suppling network remote station ground state detection method based on frequency sweep curve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105652139A (en) * 2015-12-30 2016-06-08 国家电网公司 Method for testing conductivity of grounding grid
CN106771625A (en) * 2017-02-28 2017-05-31 国网陕西省电力公司电力科学研究院 A kind of frequency sweep impedance test system of low-power consumption
CN108872793A (en) * 2018-07-19 2018-11-23 西安交通大学 DC suppling network remote station ground state detection method based on frequency sweep curve

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Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20160919

Address after: 200002 Nanjing East Road, Shanghai, No. 181, No.

Patentee after: State Grid Shanghai Municipal Electric Power Company

Patentee after: East China Electric Power Test & Research Institute Co., Ltd.

Patentee after: Shanghai Energy Saving Service Co., Ltd.

Address before: 200002 Nanjing East Road, Shanghai, No. 181, No.

Patentee before: State Grid Shanghai Municipal Electric Power Company

Patentee before: East China Electric Power Test & Research Institute Co., Ltd.