CN102759681A - Transformer core ground fault monitoring device - Google Patents

Transformer core ground fault monitoring device Download PDF

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Publication number
CN102759681A
CN102759681A CN2012102159653A CN201210215965A CN102759681A CN 102759681 A CN102759681 A CN 102759681A CN 2012102159653 A CN2012102159653 A CN 2012102159653A CN 201210215965 A CN201210215965 A CN 201210215965A CN 102759681 A CN102759681 A CN 102759681A
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CN
China
Prior art keywords
current
transformer
unit
connects
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012102159653A
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Chinese (zh)
Inventor
易瑾
杨建红
刘滢滢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xinyang Power Supply Co of Henan Electric Power Co
Original Assignee
Xinyang Power Supply Co of Henan Electric Power Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xinyang Power Supply Co of Henan Electric Power Co filed Critical Xinyang Power Supply Co of Henan Electric Power Co
Priority to CN2012102159653A priority Critical patent/CN102759681A/en
Publication of CN102759681A publication Critical patent/CN102759681A/en
Pending legal-status Critical Current

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Abstract

The invention provides a transformer core ground fault monitoring device. The device comprises a current transformer, a shell, a display screen and a measuring circuit arranged in the shell, wherein the measuring circuit is connected with the current transformer and the display screen and comprises a current/voltage conversion unit, an amplifying circuit, an A/D conversion unit, a computing control unit, an alarm unit, a display unit and a wireless transmission unit; the current transformer is clamped on a ground lead of a transformer core and is connected with the current/voltage conversion unit; the amplifying circuit is connected with the A/D conversion unit and the current/voltage conversion unit respectively; the computing control unit is connected with the A/D conversion unit, the display unit, the alarm unit and the wireless transmission unit respectively; and the display screen of the display unit is arranged on a panel of the shell. The device has the advantages of simple structure, accuracy in measurement and safety in use.

Description

Transformer core earth fault monitoring device
Technical field
The invention belongs to the current/voltage monitoring technical field, specifically, related to a kind of transformer core earth fault monitoring device.
Background technology
The ground current that is in the iron core of the transformer in the running status is very little, approximately is several milliamperes to tens milliamperes, still, and when transformer core generation multipoint earthing fault; The ground current of iron core increases to several amperes even tens amperes rapidly, will cause the local iron core of transformer overheated, thereby can cause the decomposition of oil; Produce inflammable gas, make ground wire fusing, burn out iron core; Cause the iron core electric potential floating, cause discharge, finally cause the transformer body fault.The common method of monitoring multipoint earthing of iron core of transformer fault is at present: 1, under transformer temporary interruption state, directly survey iron core insulation resistance over the ground; But; The power failure detection of transformer can have a strong impact on final user's life, activity in production; For the reliability that guarantees to supply power, adopt the mode of temporary interruption not meet the aim that the quality supply service is provided.2, the field staff adopts clamp on amperemeter to monitor its electric current, is to make a response to fault immediately with the disadvantage of the monitoring mode of clamp on amperemeter measuring transformer ground wire electric current, has the serious hidden danger that accident is further enlarged; And because the interference of transformer high-intensity magnetic field, measured value is out of true very, even the same measurement point totally different situation of measured value difference several times occurs.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The objective of the invention is the deficiency to prior art, thus provide a kind of simple in structure, be swift in response, measure accurate, easy and simple to handle, safe in utilization, practical transformer core earth fault monitoring device.
To achieve these goals; The technical scheme that the present invention adopted is: a kind of transformer core earth fault monitoring device; It comprises current transformer, housing, display screen and is arranged on the metering circuit of said enclosure interior that said metering circuit connects said current transformer and said display screen respectively; Said metering circuit comprises current/voltage-converted unit, amplifying circuit, A/D converting unit, Operations Analysis, alarm unit, display unit and wireless transmission unit; Said current transformer pincers are stuck on the ground lead of transformer core the ground current signal with the inductive pick-up transformer core; The input end that the output terminal of said current transformer connects said current/voltage-converted unit is a voltage signal with the ground current conversion of signals with the transformer core of gathering; The input end that the output terminal of said current/voltage-converted unit connects said amplifying circuit is with amplification voltage signal; The output terminal of said amplifying circuit connects the input end of said A/D converting unit to convert analog voltage signal into digital voltage signal; The output terminal that said Operations Analysis connects said A/D converting unit with the digital voltage signal after the conversion is analyzed, thereby calculation process draws efficient pressure swing device iron core grounding current value and sends control signal corresponding; The display screen of said display unit is arranged on the panel of said housing, and said display unit connects said Operations Analysis to show effective transformer iron core grounding current value; Said alarm unit connects said Operations Analysis to send alerting signal; Said Operations Analysis connects said wireless transmission unit so that efficient pressure swing device iron core grounding current value is sent to long distance control system through cordless communication network.
Based on above-mentioned, said current transformer is that precision is 1% split core type current transformer; The model of the current/voltage conversion chip of said current/voltage-converted unit is MAX4072; Said amplifying circuit is the operational amplification circuit of amplification voltage signal.
Based on above-mentioned, the model of the A/D conversion chip in the said A/D converting unit is ADS8557.
The relative prior art of the present invention has outstanding substantive distinguishing features and marked improvement; Specifically; The present invention has following characteristics: 1, this monitoring device has been realized the purpose of the real-time demonstration of transformer iron core grounding current through simple combination of circuits; Make the monitor staff can grasp the duty of transformer at any time, avoided the shutdown of transformer to detect, saved human and material resources.2, this monitoring device uses split core type current transformer, directly these current transformer pincers is stuck on the ground lead of transformer core, and is convenient and simple.3, this monitoring device connects long distance control system through the wireless transmission unit; The display device that efficient pressure swing device iron core grounding current value is sent to long distance control system shows in real time; Make the monitor staff need not arrive the scene and carry out the collection of data, just can obtain the reading of transformer iron core grounding current at Central Control Room intuitively.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structured flowchart of metering circuit.
Embodiment
Through embodiment, technical scheme of the present invention is done further detailed description below.
As shown in Figure 1; A kind of transformer core earth fault monitoring device; It comprises current transformer 1, housing 2, display screen 3 and is arranged on the metering circuit of said housing 2 inside that said metering circuit connects said current transformer 1 and said display screen 3 respectively.
As shown in Figure 2; Said metering circuit comprises current/voltage-converted unit, amplifying circuit, A/D converting unit, Operations Analysis, alarm unit, display unit and wireless transmission unit, and said current transformer 1 pincers are stuck on the ground lead 4 of transformer core the ground current signal with the inductive pick-up transformer core; The input end that the output terminal of said current transformer connects said current/voltage-converted unit is a voltage signal with the ground current conversion of signals with the transformer core of gathering; The input end that the output terminal of said current/voltage-converted unit connects said amplifying circuit is with amplification voltage signal; The output terminal of said amplifying circuit connects the input end of said A/D converting unit to convert analog voltage signal into digital voltage signal; The output terminal that said Operations Analysis connects said A/D converting unit with the digital voltage signal after the conversion is analyzed, thereby calculation process draws efficient pressure swing device iron core grounding current value and sends control signal corresponding; The display screen 3 of said display unit is arranged on the panel of said housing 2, and said display unit connects said Operations Analysis to show effective transformer iron core grounding current value; Said alarm unit connects said Operations Analysis to send alerting signal, notifies field service personnel to carry out accident immediately and gets rid of processing.
Said current transformer adopts is that precision is 1%, measurements range of current is 0-20A, be fit to clamp the split core type current transformer that is stuck in the transformer core ground lead; The model of the current/voltage conversion chip of said current/voltage-converted unit is MAX4072; Said amplifying circuit is the operational amplification circuit of amplification voltage signal; The model of the A/D conversion chip in the said A/D converting unit is ADS8557.
Said Operations Analysis connects said wireless transmission unit; Efficient pressure swing device iron core grounding current value is sent to long distance control system through cordless communication network; Thereby the display device in long distance control system shows; Make the operating personnel of long distance control system Central Control Room can obtain the effective value of transformer iron core grounding current intuitively, thereby be beneficial to the grasp of operating personnel the present duty of transformer.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.

Claims (3)

1. transformer core earth fault monitoring device; Comprise current transformer, housing, display screen and be arranged on the metering circuit of said enclosure interior; Said metering circuit connects said current transformer and said display screen respectively, it is characterized in that: said metering circuit comprises current/voltage-converted unit, amplifying circuit, A/D converting unit, Operations Analysis, alarm unit, display unit and wireless transmission unit; Said current transformer pincers are stuck on the ground lead of transformer core the ground current signal with the inductive pick-up transformer core; The input end that the output terminal of said current transformer connects said current/voltage-converted unit is a voltage signal with the ground current conversion of signals with the transformer core of gathering; The input end that the output terminal of said current/voltage-converted unit connects said amplifying circuit is with amplification voltage signal; The output terminal of said amplifying circuit connects the input end of said A/D converting unit to convert analog voltage signal into digital voltage signal; The output terminal that said Operations Analysis connects said A/D converting unit with the digital voltage signal after the conversion is analyzed, thereby calculation process draws efficient pressure swing device iron core grounding current value and sends control signal corresponding; The display screen of said display unit is arranged on the panel of said housing, and said display unit connects said Operations Analysis to show effective transformer iron core grounding current value; Said alarm unit connects said Operations Analysis to send alerting signal; Said Operations Analysis connects said wireless transmission unit so that efficient pressure swing device iron core grounding current value is sent to long distance control system through cordless communication network.
2. transformer core earth fault monitoring device according to claim 1 is characterized in that: said current transformer is that precision is 1% split core type current transformer; The model of the current/voltage conversion chip of said current/voltage-converted unit is MAX4072; Said amplifying circuit is the operational amplification circuit of amplification voltage signal.
3. transformer core earth fault monitoring device according to claim 1 is characterized in that: the model of the A/D conversion chip in the said A/D converting unit is ADS8557.
CN2012102159653A 2012-06-28 2012-06-28 Transformer core ground fault monitoring device Pending CN102759681A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102159653A CN102759681A (en) 2012-06-28 2012-06-28 Transformer core ground fault monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102159653A CN102759681A (en) 2012-06-28 2012-06-28 Transformer core ground fault monitoring device

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CN102759681A true CN102759681A (en) 2012-10-31

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CN2012102159653A Pending CN102759681A (en) 2012-06-28 2012-06-28 Transformer core ground fault monitoring device

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102981035A (en) * 2012-12-07 2013-03-20 宁夏电力公司电力科学研究院 Current clamp and power quality monitoring device
CN103063895A (en) * 2013-01-10 2013-04-24 华北电力科学研究院有限责任公司 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system
CN110970877A (en) * 2019-12-17 2020-04-07 长沙理工大学 Safety protection method and device for live working of power distribution network

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101572181A (en) * 2009-03-16 2009-11-04 华北电网有限公司北京超高压公司 Transformer core earth resistance live line measurement installing device and method therefor
CN202676845U (en) * 2012-06-28 2013-01-16 河南省电力公司信阳供电公司 Device for monitoring earth fault of transformer core

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101572181A (en) * 2009-03-16 2009-11-04 华北电网有限公司北京超高压公司 Transformer core earth resistance live line measurement installing device and method therefor
CN202676845U (en) * 2012-06-28 2013-01-16 河南省电力公司信阳供电公司 Device for monitoring earth fault of transformer core

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
卜树坡等: "变压器铁心接地电流在线监测系统的设计", 《电测与仪表》 *
李国庆等: "基于GSM的变压器铁心接地电流在线监测装置的研究", 《变压器》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102981035A (en) * 2012-12-07 2013-03-20 宁夏电力公司电力科学研究院 Current clamp and power quality monitoring device
CN103063895A (en) * 2013-01-10 2013-04-24 华北电力科学研究院有限责任公司 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system
CN110970877A (en) * 2019-12-17 2020-04-07 长沙理工大学 Safety protection method and device for live working of power distribution network

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Application publication date: 20121031