CN104833855B - To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus - Google Patents

To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus Download PDF

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Publication number
CN104833855B
CN104833855B CN201510212864.4A CN201510212864A CN104833855B CN 104833855 B CN104833855 B CN 104833855B CN 201510212864 A CN201510212864 A CN 201510212864A CN 104833855 B CN104833855 B CN 104833855B
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voltage
tension
instrument
tested
central controller
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CN201510212864.4A
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Chinese (zh)
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CN104833855A (en
Inventor
伍俊
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伍俊
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Priority to CN201510212864.4A priority Critical patent/CN104833855B/en
Priority to CN201210287526.3A priority patent/CN102798782B/en
Publication of CN104833855A publication Critical patent/CN104833855A/en
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Abstract

The present invention relates to a kind of alarm of the insulaion resistance on-line monitoring to high-tension apparatus, it includes:The high-voltage power resistance that central controller, the high voltage direct current generator being connected with the central controller, one end are connected with the high-voltage output end of the high voltage direct current generator;The other end of the high-voltage power resistance is connected with any phase output bus of tested high-tension apparatus;The housing of the high-voltage insulating resistance monitoring alarm instrument is concatenated after a sampling resistor to be systematically connected with the tested high-tension apparatus;The current input terminal of the sampling resistor is connected with the voltage signal inputs of a current sample amplifying circuit, and the signal output part of the current sample amplifying circuit is connected with the central controller;The central controller calculates the high-voltage insulating resistance of the tested high-tension apparatus according to the output signal of the current sample amplifying circuit.After test terminates, charge/discharge control circuit is suitable to the residual high pressure released automatically on equipment under test.

Description

To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus

Technical field

The present invention relates to the technical field of insulaion resistance monitoring, specifically a kind of high-voltage insulating resistance monitoring alarm instrument.

Background technology

It is contour that high-voltage insulating resistance monitoring alarm instrument is exclusively used in 10kV/6kV generators, transformer, motor, electric capacitor The on-line testing of the insulaion resistance of equipment is pressed, it, to keep high voltage electric equipment offer support in shape, is equipment Repair based on condition of component provides foundation.

The content of the invention

The technical problem to be solved in the present invention is to provide one kind it is simple in construction, be adapted for carrying out to 10kV/6kV generators, become The high-voltage insulating resistance monitoring alarm instrument of the insulaion resistance on-line monitoring of the high-tension apparatuses such as depressor, motor, electric capacitor.

In order to solve the above technical problems, the high-voltage insulating resistance monitoring alarm instrument that the present invention is provided, is characterized in including:In Entreat the High voltage output of controller, the high voltage direct current generator being connected with the central controller, one end and the high voltage direct current generator The connected high-voltage power resistance in end;Any phase of the other end of the high-voltage power resistance and tested high-tension apparatus exports bus phase Even;The housing of the high-voltage insulating resistance monitoring alarm instrument concatenates the systematically phase with the tested high-tension apparatus after a sampling resistor Even;The current input terminal of the sampling resistor is connected with the voltage signal inputs of a current sample amplifying circuit, and the electric current is adopted The signal output part of sample amplifying circuit is connected with the central controller;The central controller amplifies according to the current sample The output signal of circuit calculates the high-voltage insulating resistance of the tested high-tension apparatus.

The high voltage direct current generator includes:Suitable for generate more than 2500V test voltage DC boosting module T7, with The connected high-voltage diode D11 of DC boosting module T7 output cathode;High-voltage diode D11 negative electrode is gone here and there successively The output negative pole after a filter capacitor C50 and filter inductance L3 with the DC boosting module T7 is connect to be connected, filter capacitor C50 and Filter inductance L3 node is the electrion end HGND being connected with a charge/discharge control circuit, the high-voltage diode D11's String is provided with high-power voltage-stabilizing tube between negative electrode and electrion end HGND;The negative electrode of the high-voltage diode D11 is described The high-voltage output end of high voltage direct current generator.

Described charge/discharge control circuit includes:System for controlling the electrion end HGND and tested high-tension apparatus The relay K4 of ground break-make, working condition for controlling the relay K4 drive circuit, the drive circuit include an optocoupler U17, optocoupler U17 control end is connected with the central controller.

The central controller is connected with heating control circuit, data communication interface, switching value input circuit and is used for Control the locking control circuit of the on/off of the tested high-tension apparatus.

The method of work of above-mentioned high-voltage insulating resistance monitoring alarm instrument, it includes:After test terminates, the center control Device controls the charge/discharge control circuit to connect discharge loop, with the residual high pressure released automatically on the tested high-tension apparatus.

The central controller is connected with an instrument;When measuring insulaion resistance decline 20-40%, instrument early warning;

When measuring insulaion resistance decline more than 50%, instrument alarm;The locking control circuit of central controller controls one Action, does not allow the tested high-tension apparatus to put into operation;When there is early warning or alarm, the central controller passes through heating The heater being tested described in circuit turn on automatically in high-tension apparatus is controlled, insulaion resistance recovers to preset value to stop heating.

The technique effect that the present invention has:

(1)The high-voltage insulating resistance monitoring alarm instrument of the present invention, is made up of, detection means detection means and instrument two parts It is responsible for measurement and data processing, measurement result send instrument(It is general to combine what is constituted with display screen using touch-screen or control keyboard Control panel)Display and storage;The all automatic measurement of insulaion resistance can be achieved, measurement period is adjustable;Also manually controllable measurement.

(2)The high-voltage insulating resistance monitoring alarm instrument of the present invention has moistureproof computer heating control function, can occur early warning or Turn on automatically heater during alarm, insulaion resistance recovers to preset value to stop heating;In instrument the page can be set to set respectively Whether heater is put into when early warning or alarm;

(3)The output cathode end of DC boosting module in the high-voltage insulating resistance monitoring alarm instrument of the present invention is connected with resistance to High-voltage diode, the high-voltage diode is used to prevent the high pressure in high-pressure system from entering detection means, so fill the detection Put to be connected in high-pressure system for a long time, while unsafe factor will not be brought to high-pressure system by making the access of detection means;It is high The system voltage of pressure equipment also will not in itself cause damage to detection device;

(4)The communication interface of the present invention is used to upload insulating resistance value and coherent signal to Surveillance center;Terminate in test Afterwards, charge/discharge control circuit is suitable to the residual high pressure released automatically on equipment under test;High voltage passes through during output bus live line work High-power high voltage resistance current limliting, after decompression access 2800V high-power voltage-stabilizing tubes, even if so output bus it is long charged, The device will not be had any impact.The instrument of use can realize that two-stage is alarmed:It is serious that early warning represents that insulaion resistance declines(Absolutely Edge resistance declines 20-40%), need to ascertain the reason;Alarm represents that insulaion resistance reaches lower limit(Insulaion resistance declines more than 50%), no The tested high-tension apparatus is allowed to put into operation;When tested resistance is less than early warning setting value, alarm lamp is bright, liquid crystal screen display Show " early warning ", point out insulaion resistance to decline serious, it is necessary to note and ascertain the reason;When measured resistance value is less than alarm setting value When, alarm lamp is bright, and liquid crystal display shows Alarm, and alarm relay is closed(That is locking), now do not allow equipment to send Electricity;It can cancel alarm by SR;Cancel after alarm, closing locking can not be released.The high-power voltage-stabilizing tube of use(Its The voltage-stabiliser tube for having multiple resistance to 200V is in series), filter capacitor and filter inductance be suitable to make the ripple content of test voltage little In 1%, it is ensured that the degree of accuracy of monitoring;

(5)The shutting-brake control of the present invention:Allow tested high-tension apparatus(Such as high-tension switch cabinet)The condition of combined floodgate is last There is not Alarm in the result of minor insulation resistance measurement.Before combined floodgate, unblock button is first pressed, unblock relay closure is connected Switch closing circuit, it is allowed to close a floodgate;If last time measurement result is alarm, press after unblock button, unblock relay will It is failure to actuate, does not allow high pressure to close a floodgate;

(6)The unblock relay of the present invention resets:1. unblock relay automatically resets after switch closes a floodgate;2. SR is pressed Unblock relay can be resetted;3. automatically reset unblock relay when measurement starts next time;4. unblock relay closes 10 points Automatically reset after clock.

(7)The present invention forces to close a floodgate when occurring following situations:A, insulaion resistance testing result are unqualified, and instrument is in Alarm state, does not allow power transmission;But need of work must power transmission, and think by coherence check and judgement can be with by operating personnel During power transmission;B, detecting instrument break down, it is impossible to unlock, operating personnel by coherence check and judgement think can be with power transmission when; The power source special change-over switch of apparatus preparation can be turned off, the switch is while instrument power source is closed, short circuit locking contact is released Locking, the now operation of high-voltage switch gear will not controlled by insulation monitoring and warning device, can be closed a floodgate;

(8)In the present invention, when output bus is powered, controller inputs judgement by external connector and forbids Hi-pot test. Hi-pot test only can be just done after breaker open operation.The detection circuit of instrument is enclosed in stainless steel case body, epoxy perfusion, is prevented Dirt, humidity resistance are good, strong antijamming capability.

Brief description of the drawings

In order that present disclosure is more likely to be clearly understood, below according to specific embodiment and with reference to accompanying drawing, The present invention is further detailed explanation, wherein

Fig. 1 is the structured flowchart of the high-voltage insulating resistance monitoring alarm instrument of the present invention;

Fig. 2 is the circuit theory diagrams of high voltage direct current generator and charge/discharge control circuit;

Fig. 3 is the circuit theory diagrams of heating control circuit, locking control circuit;

Fig. 4 is the outside primary connection figure of the high-voltage insulating resistance monitoring alarm instrument of the present invention.

Embodiment

Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail:

Embodiment 1

Such as Fig. 1-4, the high-voltage insulating resistance monitoring alarm instrument of the present embodiment includes:Central controller and the center are controlled The high-voltage power resistance that the connected high voltage direct current generator of device, one end are connected with the high-voltage output end of the high voltage direct current generator RES;The other end of the high-voltage power resistance is connected with any phase output bus of tested high-tension apparatus;The high-voltage insulating resistance The housing of monitoring alarm instrument is concatenated after a sampling resistor to be systematically connected with the tested high-tension apparatus;The sampling resistor Current input terminal is connected with the voltage signal inputs of a current sample amplifying circuit, and the signal of the current sample amplifying circuit is defeated Go out end with the central controller to be connected;The central controller is calculated according to the output signal of the current sample amplifying circuit Go out the high-voltage insulating resistance of the tested high-tension apparatus.

The high voltage direct current generator includes:Suitable for generate more than 2500V test voltage DC boosting module T7, with The connected high-voltage diode D11 of DC boosting module T7 output cathode;High-voltage diode D11 negative electrode is gone here and there successively The output negative pole after a filter capacitor C50 and filter inductance L3 with the DC boosting module T7 is connect to be connected, filter capacitor C50 and Filter inductance L3 node is the electrion end HGND being connected with a charge/discharge control circuit, the high-voltage diode D11's String is provided with high-power voltage-stabilizing tube between negative electrode and electrion end HGND;The negative electrode of the high-voltage diode D11 is described The high-voltage output end of high voltage direct current generator.

Described charge/discharge control circuit includes:System for controlling the electrion end HGND and tested high-tension apparatus The relay K4 of ground break-make, working condition for controlling the relay K4 drive circuit, the drive circuit include an optocoupler U17, optocoupler U17 control end is connected with the central controller.

The central controller is connected with heating control circuit, data communication interface, switching value input circuit and is used for Control the locking control circuit of the on/off of the tested high-tension apparatus.

Basic functional principle:

1. the high-pressure generating circuit in detection means produces 2500V DC voltages and puts on electrical equipment and systematically it Between, the insulaion resistance of measurement electrical equipment over the ground.(Measurement to insulaion resistance concentrated expression high voltage electric equipment and connect with it The other equipment that connects, cable, the synthesis insulation status of part.)

2. during electric equipment operation, by the auxiliary contact locking detection means of primary cut-out, detection means does not work.

3. after electrical equipment is out of service, the insulaion resistance of detection means automatic measurement electrical equipment, to testing result Judged, less than setting value alarm;After instrument alarm, it would not allow for high voltage electric equipment and put into operation.

4. effective high_voltage isolation measure is taken inside detection means, it is ensured that detection means will not be damaged because accessing high pressure It is bad, and ensure that to high-pressure system unsafe factor will not be brought because of the access of detection means.

Embodiment 2

The method of work of the high-voltage insulating resistance monitoring alarm instrument of above-described embodiment 1, it includes:After test terminates, institute State charge/discharge control circuit described in central controller controls and connect discharge loop, it is residual on the tested high-tension apparatus to release automatically Stay high pressure.

The central controller is connected with an instrument;When measuring insulaion resistance decline 20-40%, instrument early warning;

When measuring insulaion resistance decline more than 50%, instrument alarm;The locking control circuit of central controller controls one Action, does not allow the tested high-tension apparatus to put into operation;When there is early warning or alarm, the central controller passes through heating The heater being tested described in circuit turn on automatically in high-tension apparatus is controlled, insulaion resistance recovers to preset value to stop heating.

The central controller is connected with a display screen;Obtained insulating resistance value is tested to be displayed on display screen, and Show the time point of measurement;

The memory being connected with the central controller can record 100 measurement results and corresponding time of measuring, and lead to Cross display screen and show insulaion resistance change trend curve;

Display screen can show the comprehensive change trend curve of 1000 measurement results, and tested high pressure is set described in comparative analysis Standby insulation status.

Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and is not to the present invention The restriction of embodiment.For those of ordinary skill in the field, it can also be made on the basis of the above description Its various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair Among the obvious changes or variations that bright spirit is extended out is still in protection scope of the present invention.

Claims (7)

1. a kind of high-voltage insulating resistance monitoring alarm instrument, it is characterised in that including:Central controller, it is connected with the central controller High voltage direct current generator, the high-voltage power resistance that is connected with the high-voltage output end of the high voltage direct current generator of one end;
The other end of the high-voltage power resistance is connected with any phase output bus of tested high-tension apparatus;
After housing one sampling resistor of concatenation of the high-voltage insulating resistance monitoring alarm instrument with the tested high-tension apparatus systematically It is connected;
The current input terminal of the sampling resistor is connected with the voltage signal inputs of a current sample amplifying circuit, and the electric current is adopted The signal output part of sample amplifying circuit is connected with the central controller;
The central controller is produced according to the output signal of the current sample amplifying circuit with the high voltage direct current generator DC voltage calculate the high-voltage insulating resistance of the tested high-tension apparatus;
The high voltage direct current generator includes:Suitable for the DC boosting module for the test voltage for generating more than 2500V(T7)And should DC boosting module(T7)The connected high-voltage diode of output cathode(D11);The high-voltage diode(D11)Negative electrode according to One filter capacitor of secondary concatenation(C50)And filter inductance(L3)Afterwards with the DC boosting module(T7)Output negative pole be connected, filter Ripple electric capacity(C50)And filter inductance(L3)Node be the electrion end that is connected with a charge/discharge control circuit(HGND), it is described High-voltage diode(D11)Negative electrode and electrion end(HGND)Between string be provided with high-power voltage-stabilizing tube;
The high-voltage diode(D11)Negative electrode be the high voltage direct current generator high-voltage output end;The center control Device processed is connected with the locking control circuit of the on/off for controlling the tested high-tension apparatus.
2. a kind of method of work of high-voltage insulating resistance monitoring alarm instrument as claimed in claim 1, it is characterised in that including: After test terminates, charge/discharge control circuit described in the central controller controls connects discharge loop, described tested to release automatically Residual high pressure on high-tension apparatus.
3. the method for work of high-voltage insulating resistance monitoring alarm instrument according to claim 2, it is characterised in that:The center Controller is connected with an instrument, and the instrument is to combine the control panel constituted with display screen using touch-screen or control keyboard.
4. the method for work of high-voltage insulating resistance monitoring alarm instrument according to claim 2, it is characterised in that:Described puts Electric control circuit includes:For controlling the electrion end(HGND)With the relay of the systematically break-make of tested high-tension apparatus (K4), for controlling the relay(K4)Working condition drive circuit, the drive circuit include an optocoupler(U17), the light Coupling(U17)Control end be connected with the central controller.
5. the method for work of high-voltage insulating resistance monitoring alarm instrument according to claim 3, it is characterised in that:It is exhausted when measuring When edge resistance declines 20-40%, instrument early warning.
6. the method for work of high-voltage insulating resistance monitoring alarm instrument according to claim 3, it is characterised in that:It is exhausted when measuring When edge resistance declines more than 50%, instrument alarm;After instrument alarm, the locking control circuit of central controller controls one action, The tested high-tension apparatus is not allowed to put into operation.
7. the method for work of the high-voltage insulating resistance monitoring alarm instrument according to claim 5 or 6, it is characterised in that:Going out When existing early warning or alarm, the central controller passes through the heating in tested high-tension apparatus described in heating control circuit turn on automatically Device, insulaion resistance recovers to preset value to stop heating.
CN201510212864.4A 2012-08-13 2012-08-13 To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus CN104833855B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201510212864.4A CN104833855B (en) 2012-08-13 2012-08-13 To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus
CN201210287526.3A CN102798782B (en) 2012-08-13 2012-08-13 High-voltage insulation resistance monitoring alarm

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Application Number Priority Date Filing Date Title
CN201510212864.4A CN104833855B (en) 2012-08-13 2012-08-13 To the alarm of the insulaion resistance on-line monitoring of high-tension apparatus

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104793058B (en) * 2012-08-13 2017-06-06 伍俊 High-voltage insulating resistance monitoring alarm instrument and its method of work
CN105158649B (en) * 2015-06-03 2018-06-19 廖小雄 The online state of insulation wireless monitoring device of electrical equipment and electrical
CN105092978A (en) * 2015-09-17 2015-11-25 南京民盛电子仪器有限公司 Online monitoring and offline detection dual-purpose insulation resistance tester
CN105676083A (en) * 2016-01-25 2016-06-15 上海旷奇科技有限公司 Online insulation resistance monitoring device and method for power motor
CN105675997B (en) * 2016-03-10 2019-03-12 南通大学 Vehicular battery group dynamic insulation resistor detecting device
CN105807138B (en) * 2016-03-10 2019-03-01 南通大学 The detection method of Vehicular battery group dynamic insulation resistance
CN111257644A (en) * 2020-04-01 2020-06-09 南京传积兴自动化科技有限公司 On-line monitoring circuit and monitoring system for ground insulation resistance of high-voltage power grid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940007922B1 (en) * 1989-08-18 1994-08-29 마쯔시다덴기산교 가부시기가이샤 Insulation resistance detecting apparatus
JPH10111327A (en) * 1996-10-04 1998-04-28 Hioki Ee Corp Insulation resistance meter
CN101158701A (en) * 2007-11-16 2008-04-09 中国科学院电工研究所 High voltage system electric voltage and insulaiton measurement circuit
CN201886117U (en) * 2010-09-29 2011-06-29 京滨电子装置研究开发(上海)有限公司 Insulation detection circuit of electrically-propelled vehicle

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2166460Y (en) * 1993-09-02 1994-05-25 施亚民 Computerized high-voltage insulation resistance tester
JPH10111334A (en) * 1996-10-07 1998-04-28 Hakusan Seisakusho:Kk Dc voltage generator
JP4378749B2 (en) * 2003-12-12 2009-12-09 有限会社タカ電アキタ Construction insulation monitoring device
JP5410142B2 (en) * 2008-05-30 2014-02-05 日置電機株式会社 Insulation resistance tester
CN201926715U (en) * 2010-11-20 2011-08-10 陕西艾特隆技术有限公司 Digital insulation resistance testing instrument
CN102128984A (en) * 2010-12-06 2011-07-20 河南省电力公司南阳供电公司 Comprehensive tester of programmable power supply insulation resistance and earthed resistance
CN202339383U (en) * 2011-11-14 2012-07-18 河南送变电建设公司 Extra-high voltage insulator detector
CN102520248A (en) * 2011-12-05 2012-06-27 河南省电力公司南阳供电公司 Insulation resistance and grounding resistance comprehensive tester based on programmable power supply
CN202758004U (en) * 2012-08-13 2013-02-27 伍俊 High-voltage insulation resistance monitoring alarm
CN104793058B (en) * 2012-08-13 2017-06-06 伍俊 High-voltage insulating resistance monitoring alarm instrument and its method of work

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940007922B1 (en) * 1989-08-18 1994-08-29 마쯔시다덴기산교 가부시기가이샤 Insulation resistance detecting apparatus
JPH10111327A (en) * 1996-10-04 1998-04-28 Hioki Ee Corp Insulation resistance meter
CN101158701A (en) * 2007-11-16 2008-04-09 中国科学院电工研究所 High voltage system electric voltage and insulaiton measurement circuit
CN201886117U (en) * 2010-09-29 2011-06-29 京滨电子装置研究开发(上海)有限公司 Insulation detection circuit of electrically-propelled vehicle

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CN104793058B (en) 2017-06-06
CN104793058A (en) 2015-07-22
CN102798782B (en) 2015-05-20
CN102798782A (en) 2012-11-28
CN104833855A (en) 2015-08-12

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Address after: No.1 Workshop, private industrial park, Xuzhuang street, Gaogang District, Taizhou City, Jiangsu Province

Patentee after: Wu Jun

Address before: 213022 -601, room 9, unit C, Taihu garden, Xinbei District, Jiangsu, Changzhou

Patentee before: Wu Jun