CN201886066U - Transformer core grounding current monitor - Google Patents

Transformer core grounding current monitor Download PDF

Info

Publication number
CN201886066U
CN201886066U CN2010206791009U CN201020679100U CN201886066U CN 201886066 U CN201886066 U CN 201886066U CN 2010206791009 U CN2010206791009 U CN 2010206791009U CN 201020679100 U CN201020679100 U CN 201020679100U CN 201886066 U CN201886066 U CN 201886066U
Authority
CN
China
Prior art keywords
circuit
current
transformer
monitor
output terminal
Prior art date
Application number
CN2010206791009U
Other languages
Chinese (zh)
Inventor
于捍国
Original Assignee
大连新安越电力设备有限公司
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 大连新安越电力设备有限公司 filed Critical 大连新安越电力设备有限公司
Priority to CN2010206791009U priority Critical patent/CN201886066U/en
Application granted granted Critical
Publication of CN201886066U publication Critical patent/CN201886066U/en

Links

Abstract

The utility model discloses a transformer core grounding current monitor which comprises a power circuit, a current transformer, a programmable gain amplifier, a current and voltage converting circuit, an alternating current-direct current voltage converting circuit and an A/D converting circuit. The measurable maximum current value is 10 A, and the maximum current value and the time when the maximum current occurs can be displayed, so that the monitor is convenient for a user to master the operating mode of a transformer. A grounding downlead of a transformer core to be tested is not required to be disconnected, a single-turn of the grounding downlead penetrates a hole above the transformer core grounding current monitor, and the original connection mode of the transformer core to be tested is not changed. The monitor can not cause any potential safety hazard to the operated transformer, and has the advantages that external electromagnetic interference and the electric field interference are prevented, the measuring accuracy is high, the value is accurate, the volume is small, the weight is low, and the monitor is easy to install.

Description

The transformer iron core grounding current monitor
Technical field
The utility model relates to the power transmission and transforming equipment field, relates in particular to a kind of transformer core current monitoring device.
Background technology
In order to protect device for transformer; usually draw a ground wire from transformer core; but when iron core and folder 2 above ground connection occur or break down; the transformer core current increase can cause the damage of transformer; even initiation electric power accident; traditional transformer iron core grounding current monitor measuring accuracy is low, and numerical value is inaccurate, and inconvenience is installed.
Summary of the invention
Low in order to overcome traditional transformer iron core grounding current monitor measuring accuracy, numerical value is inaccurate, and problem such as inconvenience installation etc., and the utility model provides a kind of transformer iron core grounding current monitor.
The technical scheme that the utility model is adopted for achieving the above object is: the transformer iron core grounding current monitor, comprise power circuit, current transformer, programmable gain amplifier, current-to-voltage converting circuit, AC-DC voltage conversion circuit and A/D change-over circuit, the current transformer output terminal is connected with the programmable gain amplifier input end, the programmable gain amplifier output terminal is connected with the current-to-voltage converting circuit input end, the current-to-voltage converting circuit output terminal is connected with AC-DC voltage conversion circuit input end, AC-DC voltage conversion circuit output terminal is connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with single-chip microcomputer.
Also comprise the clock oscillation circuit, watchdog circuit, button inputting circuits, alarm control circuit and the charactron display control circuit that are connected with single-chip microcomputer, charactron is connected with the charactron display control circuit, and the warning output circuit is connected with alarm control circuit.
Described power circuit comprises transformer, and the transformer output terminal is connected with current rectifying and wave filtering circuit.
It is 10A that transformer iron core grounding current monitor of the present utility model can be measured lowest high-current value, and the time that occurs can show lowest high-current value and maximum current the time, is convenient to the duty that the user grasps transformer.Need not disconnect the down conductor of tested transformer core, the down conductor single turn passes from the upper aperture of transformer iron core grounding current monitor, does not change original mode of connection of measured transformer core.Operating transformer is not caused any potential safety hazard, have anti-external electromagnetic, electric field interference, the measuring accuracy height, numerical value is accurate, and volume is little, in light weight, is easy to install.
Description of drawings
Fig. 1 is the utility model transformer iron core grounding current monitor schematic diagram.
Fig. 2 is the utility model transformer iron core grounding current monitor power circuit principle figure.
Embodiment
The principle of transformer iron core grounding current monitor is seen Fig. 1 and Fig. 2, power circuit is by transformer, constitute with current rectifying and wave filtering circuit, input AC 220V, 50HZ voltage are through output single-chip microcomputer and the required DC voltage of each several part circuit working after transformation, rectification and the filtering.The current transformer output terminal is connected with the programmable gain amplifier input end, realizes measurement, conversion and the isolation of transformer core ground connection alternating current, and its no-load voltage ratio is 10A-10mA.The programmable gain amplifier output terminal is connected with the current-to-voltage converting circuit input end, the current signal that programmable gain amplifier is sent here current transformer amplifies, its enlargement factor has 3 grades, be respectively 1 times, 10 times and 100 times, the selection of its multiple is to control according to the data-signal that single-chip microcomputer is sent here.The current-to-voltage converting circuit output terminal is connected with AC-DC voltage conversion circuit input end, current-to-voltage converting circuit is converted to voltage signal with current signal, AC-DC voltage conversion circuit output terminal is connected with A/D change-over circuit input end, and the AC-DC voltage conversion circuit is converted to DC voltage with ac voltage signal through accurate detection.A/D change-over circuit output terminal is connected with single-chip microcomputer, and the A/D change-over circuit carries out the A/D conversion with d. c. voltage signal, becomes the receivable digital signal of single-chip microcomputer, and the communication between the single-chip microcomputer is adopted serial line interface, employing 78E516 single-chip microcomputer.Also comprise the clock oscillation circuit, watchdog circuit, button inputting circuits, alarm control circuit and the charactron display control circuit that are connected with single-chip microcomputer, charactron is connected with the charactron display control circuit, and the warning output circuit is connected with alarm control circuit.Clock oscillation pulse when clock oscillation circuit produces single-chip microcomputer work mainly is made up of crystal oscillator and electric capacity.Watchdog circuit goes out out the deadlock situation in order to improve interference free performance when preventing single-chip microcomputer work, and the relevant special circuit that adopts.The setting of button inputting circuits for instrument is correlated with is provided with special-purpose button, collection and judgement that this partial circuit combines with Single Chip Microcomputer (SCM) program and can realize button.Controlling alarm is compared measured value with the warning output circuit with the upper limit alarm value of setting, if reach alert if, then corresponding output signal is outwards sent in control.The demonstration control that display control circuit is realized 8 charactrons mainly realizes that by special-purpose display chip serial dynamically shows control.
When the transformer core of measuring when current value is greater than the alarming value that sets over the ground, instrument is reported to the police automatically, and this moment, instrument face plate upper strata charactron showed lowest high-current value, and flicker reports to the police, and lower floor's charactron shows measures current value.Simultaneously by internal relay output make and break contact signal, with the warning system of control external user.

Claims (3)

1. transformer iron core grounding current monitor, it is characterized in that: comprise power circuit, current transformer, programmable gain amplifier, current-to-voltage converting circuit, AC-DC voltage conversion circuit and A/D change-over circuit, the current transformer output terminal is connected with the programmable gain amplifier input end, the programmable gain amplifier output terminal is connected with the current-to-voltage converting circuit input end, the current-to-voltage converting circuit output terminal is connected with AC-DC voltage conversion circuit input end, AC-DC voltage conversion circuit output terminal is connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with single-chip microcomputer.
2. transformer iron core grounding current monitor according to claim 1, it is characterized in that: also comprise the clock oscillation circuit, watchdog circuit, button inputting circuits, alarm control circuit and the charactron display control circuit that are connected with single-chip microcomputer, charactron is connected with the charactron display control circuit, and the warning output circuit is connected with alarm control circuit.
3. transformer iron core grounding current monitor according to claim 1 is characterized in that: described power circuit comprises transformer, and the transformer output terminal is connected with current rectifying and wave filtering circuit.
CN2010206791009U 2010-12-24 2010-12-24 Transformer core grounding current monitor CN201886066U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010206791009U CN201886066U (en) 2010-12-24 2010-12-24 Transformer core grounding current monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010206791009U CN201886066U (en) 2010-12-24 2010-12-24 Transformer core grounding current monitor

Publications (1)

Publication Number Publication Date
CN201886066U true CN201886066U (en) 2011-06-29

Family

ID=44183613

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010206791009U CN201886066U (en) 2010-12-24 2010-12-24 Transformer core grounding current monitor

Country Status (1)

Country Link
CN (1) CN201886066U (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102412556A (en) * 2011-11-24 2012-04-11 天津市百利电气有限公司 Grounding current protective function module for circuit breaker
CN102565610A (en) * 2011-12-23 2012-07-11 西安奇维科技股份有限公司 Short circuit detector based on electromagnetic induction principle and detection method of short circuit detector
CN102570435A (en) * 2012-01-06 2012-07-11 大连新安越电力设备有限公司 Iron-core two-point earthing protecting device of inductance type transformer
CN102608408A (en) * 2012-03-30 2012-07-25 辽宁省电力有限公司朝阳供电公司 Current monitoring device for transformer core
CN103116063A (en) * 2013-01-23 2013-05-22 大连新安越电力设备有限公司 Transformer iron core ground connection electric current monitor
CN103852624A (en) * 2014-03-28 2014-06-11 国家电网公司 Hand-held convertor transformer core grounding current tester
CN104483534A (en) * 2014-12-04 2015-04-01 国网四川省电力公司甘孜供电公司 Intelligent monitoring alarm for grounding current of transformer core
CN104483526A (en) * 2014-12-04 2015-04-01 国网四川省电力公司电力科学研究院 Grounding current induction monitor for power grid transformer
CN104931770A (en) * 2015-05-18 2015-09-23 国家电网公司 Internet of things technology-based transformer iron core grounding current detection method
CN106597068A (en) * 2015-10-19 2017-04-26 沈阳新松机器人自动化股份有限公司 Current sampling circuit and sampling method
CN110568255A (en) * 2019-09-27 2019-12-13 上海锐开电气有限公司 Sensor for on-site display of clamp-type iron core grounding current during transformer main transformer operation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102412556A (en) * 2011-11-24 2012-04-11 天津市百利电气有限公司 Grounding current protective function module for circuit breaker
CN102565610A (en) * 2011-12-23 2012-07-11 西安奇维科技股份有限公司 Short circuit detector based on electromagnetic induction principle and detection method of short circuit detector
CN102570435A (en) * 2012-01-06 2012-07-11 大连新安越电力设备有限公司 Iron-core two-point earthing protecting device of inductance type transformer
CN102608408A (en) * 2012-03-30 2012-07-25 辽宁省电力有限公司朝阳供电公司 Current monitoring device for transformer core
CN103116063A (en) * 2013-01-23 2013-05-22 大连新安越电力设备有限公司 Transformer iron core ground connection electric current monitor
CN103852624A (en) * 2014-03-28 2014-06-11 国家电网公司 Hand-held convertor transformer core grounding current tester
CN104483534A (en) * 2014-12-04 2015-04-01 国网四川省电力公司甘孜供电公司 Intelligent monitoring alarm for grounding current of transformer core
CN104483526A (en) * 2014-12-04 2015-04-01 国网四川省电力公司电力科学研究院 Grounding current induction monitor for power grid transformer
CN104931770A (en) * 2015-05-18 2015-09-23 国家电网公司 Internet of things technology-based transformer iron core grounding current detection method
CN106597068A (en) * 2015-10-19 2017-04-26 沈阳新松机器人自动化股份有限公司 Current sampling circuit and sampling method
CN110568255A (en) * 2019-09-27 2019-12-13 上海锐开电气有限公司 Sensor for on-site display of clamp-type iron core grounding current during transformer main transformer operation

Similar Documents

Publication Publication Date Title
CN102437646B (en) Wireless temperature and humidity monitoring device for high-voltage switch cabinet
CN101571563B (en) Integrative electric energy quality monitoring terminal
CN101900782B (en) Testing system of gas insulated combined electric appliance equipment
CN102023253B (en) Lightning-proof monitoring warning system
CN201654160U (en) Transformer core grounding AC-DC on-line monitoring device
CN203773010U (en) Partial discharge on-line monitoring instrument based on switch cabinet charge indicator
CN204130836U (en) For the safety socket of charging pile
CN202533545U (en) Power transmission network fault detection system based on internet of things technology
CN104374964A (en) Electric energy meter capable of measuring residual currents
WO2012059061A1 (en) Method and device for quality-monitoring of high-voltage electrical energy
CN204214977U (en) Neutral line break detection control device
CN102157861A (en) Intelligent multifunctional socket
CN201141891Y (en) Power consumption collection module
CN201724978U (en) Wireless automatic electricity getting current sensor
CN102749562A (en) Insulation monitoring device and monitoring method of power cell of electric vehicle
CN103364685A (en) Current temperature on-line fault indicator and method for judging fault
CN103674293A (en) Dry-type electric reactor temperature detection system
CN202217031U (en) Insulation detection device for high voltage bushing of transformer
CN201247278Y (en) On-line monitoring device for grounding current of transformer iron core
CN203798898U (en) High-voltage electriferous display locking device
CN204925226U (en) Blocking device is gathered to high voltage live display wide region
CN104071715A (en) Near-to-high-voltage safety prewarning method for construction hoist
CN103453998A (en) Self-energy-taking wireless temperature sensor and achieving method thereof
CN203572887U (en) Wireless three dimensional electric field measurement alarm device
CN105573233A (en) Circuit intelligence management system

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Transformer iron core ground connection electric current monitor

Effective date of registration: 20120723

Granted publication date: 20110629

Pledgee: Liaoning financial credit Company limited by guarantee

Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd.

Registration number: 2012990000396

PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20130626

Granted publication date: 20110629

Pledgee: Liaoning financial credit Company limited by guarantee

Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd.

Registration number: 2012990000396

PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Transformer iron core ground connection electric current monitor

Effective date of registration: 20130717

Granted publication date: 20110629

Pledgee: Liaoning financial credit Company limited by guarantee

Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd.

Registration number: 2013990000463

PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20140620

Granted publication date: 20110629

Pledgee: Liaoning financial credit Company limited by guarantee

Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd.

Registration number: 2013990000463

PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Transformer iron core ground connection electric current monitor

Effective date of registration: 20140623

Granted publication date: 20110629

Pledgee: Liaoning financial credit Company limited by guarantee

Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd.

Registration number: 2014990000494

PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20150901

Granted publication date: 20110629

Pledgee: Liaoning financial credit Company limited by guarantee

Pledgor: Dalian New Anyue Electric Power Equipment Co., Ltd.

Registration number: 2014990000494

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110629

Termination date: 20151224

EXPY Termination of patent right or utility model