CN204154848U - A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device - Google Patents

A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device Download PDF

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Publication number
CN204154848U
CN204154848U CN201420634193.1U CN201420634193U CN204154848U CN 204154848 U CN204154848 U CN 204154848U CN 201420634193 U CN201420634193 U CN 201420634193U CN 204154848 U CN204154848 U CN 204154848U
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China
Prior art keywords
secondary circuit
output terminal
potential transformer
earth faults
unit
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CN201420634193.1U
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Chinese (zh)
Inventor
徐玉凤
连宝晶
肖一帆
赵培诚
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NUJIANG POWER SUPPLY BUREAU YUNNAN GRID CO Ltd
GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO Ltd
Nujiang Power Supply Bureau of Yunnan Power Grid Co Ltd
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NUJIANG POWER SUPPLY BUREAU YUNNAN GRID CO Ltd
GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO Ltd
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Priority to CN201420634193.1U priority Critical patent/CN204154848U/en
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Abstract

The utility model discloses a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device, comprise multiple stage and be arranged on current transformer on Secondary Circuit of Potential Transformer, monitoring main frame and host computer, the output terminal of described current transformer is connected with the input end of monitoring main frame, and described monitoring main frame is connected with host computer.The utility model can judge Secondary Circuit of Potential Transformer multipoint earth faults fast, accurately and safely, and accurate line selection and location is realized to the loop of multipoint earth faults, decreased voltage mutual inductor multipoint earth faults search difficulty, the working time of Secondary Circuit of Potential Transformer fault can be reduced greatly, improve the reliability of safe operation of power system.The utility model can be widely used in electric power monitoring field.

Description

A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device
Technical field
The utility model relates to fault test set technical field, particularly relates to a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device.
Background technology
Protective voltage transformer, provides data criterion visual plant to protection, and how are its stability, reliability, is to ensure that whether protective device is stable, the important step of action message.On the Secondary Circuit of Potential Transformer be in operation, in order to equipment and personal safety and must can only be connected to earth mat by a bit.Because the earth mat of transformer station is not equipotential plane, potential difference (PD) is there will be at earth mat difference, when N600 is respectively switch place ground connection and pulpit ground connection, if system generation earth fault, substation ground network flows through major break down electric current, at this moment N600 two ends there will be potential difference (PD), and it offsets causing the voltage-phase of neutral point, and then affects amplitude and the phase place of phase voltage and residual voltage.Thus distance protection, zero-sequence voltage injection tripping or malfunction may be caused.
State Grid Corporation of China's " relay protection of power system and automatic safety device anti-accident measures " clear stipulaties, operating Secondary Circuit of Potential Transformer must can only be connected to grounded screen by a bit.
And south electric network power-management centre issues tune and to continue [2009] No. 10 documentation requirements, whether each factory, office, to the Secondary Circuit of Potential Transformer of 220kV and above plant stand, exist at 2 or multipoint earthing is investigated, and every 6 months measure a N600 ground current.
The accidents such as therefore, whether Real-Time Monitoring Secondary Circuit of Potential Transformer exists multipoint earth faults, and Timeliness coverage also gets rid of this type of earth fault, the false protection can effectively avoiding Secondary Circuit of Potential Transformer multipoint earth faults to cause.
In current system, the conventional method judging Secondary Circuit of Potential Transformer N600 whether one point earth inspection is electric-resistivity method, and electric-resistivity method detects the circuit diagram of PT secondary circuit as shown in Figure 1, and detecting step is as follows:
(1) close disconnecting link K, disconnects the tie of pulpit one point earth.
(2) adjusting slide wire resistance R is 0 Europe, and close disconnecting link K1, disconnects disconnecting link K, electric current (with high precision clamp reometer) on measuring slide wire resistance R.
(3) close disconnecting link K, and disconnect disconnecting link K1, slide wire resistance R increases to 10 Europe, and close disconnecting link K1, disconnects disconnecting link K, electric current on measuring slide wire resistance R.
(4) to power on stream analysis to slide wire resistance R, electric current changes, then PT secondary circuit N600 exists two point (or multiple spot) ground connection.
The shortcoming that prior art exists is:
(1) operating process needs the repeatedly total ground wire of off voltage transformer secondary circuit N600, and to security of system hidden danger, method of operating is very dangerous;
(2) when judging that the N line of specifically which Secondary Circuit of Potential Transformer exists multipoint earthing, can not offset the impact of out-of-balance current, the electric current cannot distinguishing N600 existence is unbalance load electric current, or ground current, may erroneous judgement be caused, increase unnecessary workload;
(3) only when testing, could judge whether system exists multipoint earth faults, quick discovery can not be accomplished to fault, and process.
Utility model content
In order to solve the problems of the technologies described above, the purpose of this utility model is to provide a kind of safe and reliable, and can improve a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device of accuracy.
The technical scheme that the utility model adopts is:
A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device, comprise multiple stage and be arranged on current transformer on Secondary Circuit of Potential Transformer, monitoring main frame and host computer, the output terminal of described current transformer is connected with the input end of monitoring main frame, and described monitoring main frame is connected with host computer.
As further improvement of the utility model, described monitoring main frame comprises central processing unit, N1-N15 current sampling unit, N600 current sampling unit, AD conversion unit, fault locator, alarm output unit, communication interface, liquid crystal display, keyboard, pilot lamp and storage unit, the output terminal of described current transformer is connected with the first input end of AD conversion unit by N1-N15 current sampling unit, the output terminal of described current transformer is connected with the second input end of AD conversion unit by N600 current sampling unit, the described output terminal of AD conversion unit is connected with the first input end of central processing unit, the output terminal of described keyboard is connected with the second input end of central processing unit, described central processing unit respectively with fault locator, communication interface is connected with storage unit, first output terminal of described central processing unit is connected with the input end of liquid crystal display, second output terminal of described central processing unit is connected with the input end of pilot lamp, 3rd output terminal of described central processing unit is connected with the input end of alarm output unit.
As further improvement of the utility model, the output terminal of described alarm output unit is connected with hummer.
As further improvement of the utility model, described communication interface is RS232 interface or RS485 interface.
As further improvement of the utility model, described current transformer is open type current transformer.
The beneficial effects of the utility model are:
A kind of Secondary Circuit of Potential Transformer of the utility model multipoint earth faults on-Line Monitor Device is gathered by multiple stage current transformer and the N line current of monitoring each Secondary Circuit of Potential Transformer realizes judgement and the location of multipoint earth faults, do not need there is any electrical connection with system, completely and isolation of system, the safe operation of observation process not influential system, improves safe reliability greatly.The utility model instead of original human at periodic intervals test, energy Timeliness coverage Secondary Circuit of Potential Transformer multipoint earth faults, and accurate line selection and location can be realized to the loop of multipoint earth faults by fault locator, decreased voltage mutual inductor multipoint earth faults search difficulty, the working time of Secondary Circuit of Potential Transformer fault can be reduced greatly, improve the reliability of safe operation of power system.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
Fig. 1 is the functional-block diagram of a kind of Secondary Circuit of Potential Transformer multipoint earth faults of the utility model on-Line Monitor Device.
Embodiment
With reference to figure 1, a kind of Secondary Circuit of Potential Transformer multipoint earth faults of the utility model on-Line Monitor Device, comprise multiple stage and be arranged on current transformer on Secondary Circuit of Potential Transformer, monitoring main frame and host computer, the output terminal of described current transformer is connected with the input end of monitoring main frame, and described monitoring main frame is connected with host computer.
Be further used as preferred embodiment, described monitoring main frame comprises central processing unit, N1-N15 current sampling unit, N600 current sampling unit, AD conversion unit, fault locator, alarm output unit, communication interface, liquid crystal display, keyboard, pilot lamp and storage unit, the output terminal of described current transformer is connected with the first input end of AD conversion unit by N1-N15 current sampling unit, the output terminal of described current transformer is connected with the second input end of AD conversion unit by N600 current sampling unit, the described output terminal of AD conversion unit is connected with the first input end of central processing unit, the output terminal of described keyboard is connected with the second input end of central processing unit, described central processing unit respectively with fault locator, communication interface is connected with storage unit, first output terminal of described central processing unit is connected with the input end of liquid crystal display, second output terminal of described central processing unit is connected with the input end of pilot lamp, 3rd output terminal of described central processing unit is connected with the input end of alarm output unit.Wherein, described N600 current sampling unit is clipped on the total ground connection of Secondary Circuit of Potential Transformer N600 by current transformer, and described N1-N15 current sampling unit is then clipped on the N line of each detected Secondary Circuit of Potential Transformer respectively by current transformer.
Be further used as preferred embodiment, the output terminal of described alarm output unit is connected with hummer.
Be further used as preferred embodiment, described communication interface is RS232 interface or RS485 interface.
Be further used as preferred embodiment, described current transformer is open type current transformer, the transformation that can realize not having a power failure, does not need to disconnect N600 ground wire in installation process, embodies portable function of installing.
The utility model is according to the change of the total ground wire electric current of N600, open type current transformer is adopted to detect Secondary Circuit of Potential Transformer in real time, by N600 current sampling unit and N1-N15 current sampling unit Real-time Collection N line current signal, in conjunction with the electric current that the pressure reduction existed between fault locator detection multipoint earth faults point and the total earth point of N600 produces, and in Quick N1-N15, there is the loop of multipoint earth faults, the localization of fault data drawn can be stored in storage unit or by communications interface transmission to host computer, facilitate operations staff to dispatch and consult.
The utility model can judge Secondary Circuit of Potential Transformer multipoint earth faults fast, accurately and safely, and accurate line selection and location is realized to the loop of multipoint earth faults, decreased voltage mutual inductor multipoint earth faults search difficulty, the working time of Secondary Circuit of Potential Transformer fault can be reduced greatly, improve the reliability of safe operation of power system.
More than that better enforcement of the present utility model is illustrated, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to the utility model spirit, and these equivalent distortion or replacement are all included in the application's claim limited range.

Claims (5)

1. a Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device, it is characterized in that: comprise multiple stage and be arranged on current transformer on Secondary Circuit of Potential Transformer, monitoring main frame and host computer, the output terminal of described current transformer is connected with the input end of monitoring main frame, and described monitoring main frame is connected with host computer.
2. a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device according to claim 1, it is characterized in that: described monitoring main frame comprises central processing unit, N1-N15 current sampling unit, N600 current sampling unit, AD conversion unit, fault locator, alarm output unit, communication interface, liquid crystal display, keyboard, pilot lamp and storage unit, the output terminal of described current transformer is connected with the first input end of AD conversion unit by N1-N15 current sampling unit, the output terminal of described current transformer is connected with the second input end of AD conversion unit by N600 current sampling unit, the described output terminal of AD conversion unit is connected with the first input end of central processing unit, the output terminal of described keyboard is connected with the second input end of central processing unit, described central processing unit respectively with fault locator, communication interface is connected with storage unit, first output terminal of described central processing unit is connected with the input end of liquid crystal display, second output terminal of described central processing unit is connected with the input end of pilot lamp, 3rd output terminal of described central processing unit is connected with the input end of alarm output unit.
3. a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device according to claim 2, is characterized in that: the output terminal of described alarm output unit is connected with hummer.
4. a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device according to claim 2, is characterized in that: described communication interface is RS232 interface or RS485 interface.
5. a kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device according to claim 1, is characterized in that: described current transformer is open type current transformer.
CN201420634193.1U 2014-10-28 2014-10-28 A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device Active CN204154848U (en)

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CN201420634193.1U CN204154848U (en) 2014-10-28 2014-10-28 A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420634193.1U CN204154848U (en) 2014-10-28 2014-10-28 A kind of Secondary Circuit of Potential Transformer multipoint earth faults on-Line Monitor Device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108614195A (en) * 2018-06-22 2018-10-02 广东电网有限责任公司 Substation PT N600 ground connection on-line monitoring positioning device and method
CN110954845A (en) * 2019-12-19 2020-04-03 深圳供电局有限公司 CT secondary circuit multipoint earth fault on-line monitoring system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108614195A (en) * 2018-06-22 2018-10-02 广东电网有限责任公司 Substation PT N600 ground connection on-line monitoring positioning device and method
CN110954845A (en) * 2019-12-19 2020-04-03 深圳供电局有限公司 CT secondary circuit multipoint earth fault on-line monitoring system and method

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