CN206541018U - A kind of multipoint grounding seeking instrument of voltage transformer - Google Patents

A kind of multipoint grounding seeking instrument of voltage transformer Download PDF

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Publication number
CN206541018U
CN206541018U CN201720052705.7U CN201720052705U CN206541018U CN 206541018 U CN206541018 U CN 206541018U CN 201720052705 U CN201720052705 U CN 201720052705U CN 206541018 U CN206541018 U CN 206541018U
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China
Prior art keywords
transformer
controller
output
housing
current transformer
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Application number
CN201720052705.7U
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Chinese (zh)
Inventor
谢东
韩荣涛
蔡进
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Guangzhou Long Electronic Technology Co Ltd
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Guangzhou Long Electronic Technology Co Ltd
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Abstract

The utility model discloses a kind of multipoint grounding seeking instrument of voltage transformer, including housing and multiple current transformers, the current transformer output end is connected to the discharge circuit of case inside;The discharge circuit electrically connects A/D converter circuit;The A/D converter circuit output end is connected to controller;It is characterized in that:The controller is electrically connected with DA output circuits;The DA output circuits output end is connected to multiple test interfaces on housing;The controller is also electrically connected with memory, double-display screen, feeler switch, current transformer switching keyboard and alarm;Measuring head is provided between the current transformer and discharge circuit.Multipoint grounding seeking instrument of voltage transformer of the present utility model, can realize itself testing calibration, can realize that detection limit is traced to the source, it is ensured that the accuracy of detection.

Description

A kind of multipoint grounding seeking instrument of voltage transformer
Technical field
The utility model is related to a kind of earthing searching instrument, and in particular to a kind of multipoint grounding seeking instrument of voltage transformer, category In electronic instrument technology field.
Background technology
According to《Relay protection of power system and automatic safety device anti-accident measures main points》Middle regulation (1) is through control room zero Several groups of Secondary Circuit of Potential Transformer of mutually small bus (N600) UNICOM, only should be in control room by N600 one point earths, each voltage Transformer secondary neutral should disconnect in the earth point of switch yard;To ensure that ground connection is reliable, the neutral conductor of each voltage transformer is not The switch that may be disconnected or contactor etc. must be connected to;(2) such as recognize in the secondary coil of voltage transformer of control room one point earth For necessity, secondary coil neutral point can be grounded through discharging gap or zinc oxide valve plate in switch yard, its breakdown voltage peak value 30Imax volts are should be greater than, by the maximum earth current virtual value of possibility of electric substation when Imax is power network earth fault, unit is Kilo-ampere;When N600 is grounded in switch yard ground connection and control room respectively, if system jam, transformer station or power plant earth mat Major break down electric current is flowed through, at this moment potential difference occurs in N600 two ends, it offsets the voltage-phase for causing neutral point, and then influenceed The amplitude and phase of phase voltage and residual voltage;So as to cause distance protection, zero-sequence voltage injection tripping or malfunction;If N600 loose contacts, will also result in the voltage-phase skew of neutral point;Each voltage transformer neutral point must not be connected to may disconnection Breaker or contactor, control room voltage transformer switching screen on, the ground connection of secondary winding each lead must be connected to On the grounding copper bar for shielding cabinet, and can not be using the method concatenated;In order to solve the above problems, Chinese Patent Application No.: 201120530173.6, disclose a kind of multipoint grounding seeking instrument of voltage transformer, including a microprocessor, the microprocessor Power supply, Double liquid crystal display circuit, input through keyboard circuit, storage circuit and measuring circuit are connected to, the measuring circuit is also It is connected with an input interface arranged side by side;The utility model multipoint grounding seeking instrument of voltage transformer passes through to ground wire at diverse location The current waveform of interior detection is compared, so that fast and accurately judge and find out the situation of voltage transformer multipoint earthing, and And it is simple to operate, practical and convenient and safe and efficient, provide a kind of safe and effective mutual induction of voltage for vast power generation or supply enterprise Device multipoint earth faults search means, have further ensured power system security stable operation;It can be under not power-off condition Overhauled, therefore, by power department extensive use, but as the highest standard of on-the-spot test, its own is accurately and reliably spent especially To be important, and in the prior art, also without searching the equipment that instrument is calibrated with can achieving a butt joint, during detection, apparatus measures Value can not trace to the source.
Utility model content
To solve the above problems, the utility model proposes a kind of multipoint grounding seeking instrument of voltage transformer, can realize Itself testing calibration, can realize that detection limit is traced to the source, it is ensured that the accuracy of detection.
Multipoint grounding seeking instrument of voltage transformer of the present utility model, including housing and multiple current transformers, the electricity Current transformer output end is connected to the discharge circuit of case inside;The discharge circuit electrically connects A/D converter circuit;The AD turns Change circuit output end and be connected to controller;The controller is electrically connected with DA output circuits;The DA output circuits output end connects It is connected to multiple test interfaces on housing;The controller is also electrically connected with memory, double-display screen, feeler switch, Current Mutual Inductance Device switches keyboard and alarm;Measuring head is provided between the current transformer and discharge circuit, detection data pass through amplifier After circuit conditioning, changed by A/D converter circuit, digital quantity is delivered into controller after completing conversion, controller is mutual by electric current Sensor delivers to memory storage and display screen is shown, switching keyboard by current transformer allows hand over different current transformers inspections Data are surveyed, two display screens are shown shows one-shot measurement and current measured value before current transformer respectively;When needing to be calibrated When, by the way that measuring head and test interface are installed, feeler switch is pressed, DA output circuits output detection waveform will by measuring head Data deliver to AD change-over circuits, finally deliver to controller control display.
As preferred embodiment, the controller is also electrically connected with the printing interface on housing, passes through printing interface The data that can be shown on display screen carry out output printing.
As preferred embodiment, the current transformer is removable high-precision split core type current transformer;It is described to survey Examination head is fixed on removable high-precision split core type current transformer output end;The measuring head is a conductive hook angle.
Further, conductive hook is provided with protective case on the outside of angle.
As preferred embodiment, transformer is additionally provided with the housing;The transformer inputs are connected to electricity Source;Induction tube is additionally provided with the housing;The transformer is connected to load by induction tube;When instrument calibration, by electricity Current transformer is clamped on induction tube, by detecting induction tube outputting standard waveform, is calibrated, when a certain current transformer is inclined , it is necessary to current transformer be changed, when each current transformer all deviation occurs, it is necessary to be examined to instrument internal when poor larger Repair.
Compared with prior art, multipoint grounding seeking instrument of voltage transformer of the present utility model can for the utility model Itself testing calibration is realized, can realize that detection limit is traced to the source, it is ensured that the accuracy of detection.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present utility model.
Embodiment
Because the separate modular of circuit belongs to prior art, the utility model directly carries out assembling application to it, therefore, Specific circuit theory diagrams are no longer described in detail.
Embodiment 1:
As shown in figure 1, multipoint grounding seeking instrument of voltage transformer of the present utility model, including housing 1 and multiple electric currents it is mutual Sensor 2, the output end of current transformer 2 is connected to the discharge circuit 3 of the inner side of housing 1;The electrical connection of discharge circuit 3 AD turns Change circuit 4;The output end of A/D converter circuit 4 is connected to controller 5;The controller 5 is electrically connected with DA output circuits 6;Institute State multiple test interfaces 7 that the output end of DA output circuits 6 is connected on housing;The controller 5 be also electrically connected with memory 8, Double-display screen 9, feeler switch 10, current transformer switching keyboard 11 and alarm 12;The current transformer 2 and discharge circuit 3 Between be provided with measuring head 13, after detection data are nursed one's health by discharge circuit, changed by A/D converter circuit, complete to change Digital quantity is delivered into controller afterwards, are delivered into memory storage by current transformer for controller and display screen is shown, mutual by electric current Sensor switching keyboard allows hand over different current transformer detection data, and two display screens are shown shows that current transformer is previous respectively Secondary measurement and current measured value;When needing to be calibrated, by the way that measuring head and test interface are installed, feeler switch is pressed, DA output circuits export detection waveform, and data are delivered into AD change-over circuits by measuring head, finally deliver to controller control aobvious Show.
Wherein, the controller 5 is also electrically connected with the printing interface 14 on housing, can be shown in by printing interface Data on display screen carry out output printing.The current transformer 2 is removable high-precision split core type current transformer;It is described Measuring head 13 is fixed on removable high-precision split core type current transformer output end;The measuring head 13 is a conductive hook angle.It is described Conduction hooks the outside of angle 15 and is provided with protective case 16.
Embodiment 2:
As shown in figure 1, the present embodiment and embodiment 1 are basically identical, wherein, it is additionally provided with transformer in the housing 1 17;The input of transformer 17 is connected to power supply;Induction tube 18 is additionally provided with the housing 1;The transformer passes through sense Should pipe be connected to load 15;Other structures are consistent with embodiment 1;When instrument calibration, current transformer is clamped in induction tube On, by detecting induction tube outputting standard waveform, calibrated, when a certain current transformer deviation is larger, it is necessary to change electricity Current transformer, when each current transformer all deviation occurs, it is necessary to be overhauled to instrument internal.
Multipoint grounding seeking instrument of voltage transformer of the present utility model, can realize itself testing calibration, can realize inspection Measuring traceability, it is ensured that the accuracy of detection.
Using it is above-mentioned according to desirable embodiment of the present utility model as enlightenment, pass through above-mentioned description, related work people Member can carry out various changes and amendments in the range of without departing from this utility model technological thought completely.This reality The content on specification is not limited to new technical scope, it is necessary to its technology is determined according to right Property scope.

Claims (5)

1. a kind of multipoint grounding seeking instrument of voltage transformer, including housing and multiple current transformers, the current transformer are defeated Go out the discharge circuit that end is connected to case inside;The discharge circuit electrically connects A/D converter circuit;The A/D converter circuit output End is connected to controller;It is characterized in that:The controller is electrically connected with DA output circuits;The DA output circuits output end connects It is connected to multiple test interfaces on housing;The controller is also electrically connected with memory, double-display screen, feeler switch, Current Mutual Inductance Device switches keyboard and alarm;Measuring head is provided between the current transformer and discharge circuit.
2. multipoint grounding seeking instrument of voltage transformer according to claim 1, it is characterised in that:The controller is also electrically connected It is connected to the printing interface on housing.
3. multipoint grounding seeking instrument of voltage transformer according to claim 1, it is characterised in that:The current transformer is Removable high accuracy split core type current transformer;The measuring head is fixed on removable high-precision split core type current transformer output end; The measuring head is a conductive hook angle.
4. multipoint grounding seeking instrument of voltage transformer according to claim 3, it is characterised in that:On the outside of the conductive hook angle It is provided with protective case.
5. multipoint grounding seeking instrument of voltage transformer according to claim 1, it is characterised in that:Also set up in the housing There is transformer;The transformer inputs are connected to power supply;Induction tube is additionally provided with the housing;The transformer passes through sense Should pipe be connected to load.
CN201720052705.7U 2017-01-18 2017-01-18 A kind of multipoint grounding seeking instrument of voltage transformer Active CN206541018U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720052705.7U CN206541018U (en) 2017-01-18 2017-01-18 A kind of multipoint grounding seeking instrument of voltage transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720052705.7U CN206541018U (en) 2017-01-18 2017-01-18 A kind of multipoint grounding seeking instrument of voltage transformer

Publications (1)

Publication Number Publication Date
CN206541018U true CN206541018U (en) 2017-10-03

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CN201720052705.7U Active CN206541018U (en) 2017-01-18 2017-01-18 A kind of multipoint grounding seeking instrument of voltage transformer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109375134A (en) * 2018-10-08 2019-02-22 中国大唐集团科学技术研究院有限公司火力发电技术研究院 Generator outlet voltage transformer internal fault on-line monitoring method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109375134A (en) * 2018-10-08 2019-02-22 中国大唐集团科学技术研究院有限公司火力发电技术研究院 Generator outlet voltage transformer internal fault on-line monitoring method and system

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