CN201344959Y - Condition monitoring device for floating mold difference high-voltage capacitor - Google Patents

Condition monitoring device for floating mold difference high-voltage capacitor Download PDF

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Publication number
CN201344959Y
CN201344959Y CNU2009200835034U CN200920083503U CN201344959Y CN 201344959 Y CN201344959 Y CN 201344959Y CN U2009200835034 U CNU2009200835034 U CN U2009200835034U CN 200920083503 U CN200920083503 U CN 200920083503U CN 201344959 Y CN201344959 Y CN 201344959Y
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CN
China
Prior art keywords
voltage
capacitor
voltage capacitor
current sensor
current
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Expired - Lifetime
Application number
CNU2009200835034U
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Chinese (zh)
Inventor
刘瑞云
陶维亮
芦爱军
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Wuhan Dianlian Electric Power & Electrical Technology Co Ltd
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Wuhan Dianlian Electric Power & Electrical Technology Co Ltd
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Priority to CNU2009200835034U priority Critical patent/CN201344959Y/en
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Publication of CN201344959Y publication Critical patent/CN201344959Y/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides a condition monitoring device for a floating mold difference high-voltage capacitor. The condition monitoring device comprises tested high-voltage capacitors, current sensors, a voltage transformer or a discharge coil, a terminal panel, a capture card, a computer and a data processing system; a current sensor is mounted on one sleeve of each high-voltage capacitor; the running current signals of the high-voltage capacitors are respectively sent to the terminal panel in parallel after passing through the current sensors; the high-voltage signals of the high-voltage capacitors are respectively sent to the terminal panel in parallel independently after being converted by the voltage transformers parallel with the high-voltage signals or the discharge coil; the voltage and current signals of the terminal panel are sent to the capture card; and the digital signals are transmitted to the computer and the data processing system after the analog to digital conversion completed by the capture card. The condition monitoring device can effectively avoid interference, quickly and accurately judge the operation condition of the capacitor device, finger out the failed capacitor and the problems during the operation of the device in time, prevent the fault of the capacitor set from spreading, and improve the operation level of the capacitor set.

Description

The floating model difference value high-voltage capacitor state monitoring device
Technical field
The utility model relates to a kind of floating model difference value high-voltage capacitor state monitoring device, is to be used for the high-voltage capacitor group, carries out a kind of device of capacitor group and single capacitor monitoring running state.
Background technology
The high-voltage capacitor group is made of many single capacitors, the design field intensity height of capacitor itself in addition, so the operation troubles rate of capacitor is higher in the electric equipment.Because capacitors count numerous (often being tens of) in the capacitor group, influence factor is numerous, therefore only depends on present capacitor group voltage, the information that current signal provides, and is difficult to analyze the reason of capacitor fault, also with regard to difficulty innovative approach targetedly.Thereby cause way to think a lot, but failure rate reduce limited situation.Based on this situation, very the operation conditions of electrolysis condenser and the process and the reason of fault progression have been needed, so that innovative approach reaches the purpose that improves the security of system reliability targetedly.
Summary of the invention
The purpose of this utility model is to provide a kind of floating model difference value high-voltage capacitor state monitoring device, can avoid interference effectively, very judge the operation conditions of capacitor device fast and accurately, in time find fault capacitor and device problems in running, avoid capacitor group fault to enlarge, and improve capacitor group operation level.
The technical solution of the utility model is: the floating model difference value high-voltage capacitor state monitoring device, comprise tested high-voltage capacitor, current sensor, voltage transformer (VT) or discharge coil, it is characterized in that: also comprise terminal strip, capture card and computing machine and data handling system; A current sensor is installed on the sleeve pipe of every high-voltage capacitor, and independent separately parallel connection was delivered on the terminal strip after the running current signal of high-voltage capacitor was changed by current sensor; Voltage transformer (VT) or discharge coil are in parallel with high-voltage capacitor, and independent separately parallel connection was delivered on the terminal strip after the high-voltage signal on the high-voltage capacitor was transformed by voltage transformer (VT) or discharge coil; The voltage, the current signal that pass to terminal strip are sent on the capture card, after capture card is finished analog-to-digital conversion, digital signal are passed in computing machine and data handling system.
Aforesaid floating model difference value high-voltage capacitor state monitoring device is characterized in that: current sensor is loaded on a ferrule boot of high-voltage capacitor.
Aforesaid floating model difference value high-voltage capacitor state monitoring device is characterized in that: current sensor is to clamp or sleeve structure.
The beneficial effects of the utility model: the utility model is by measurement and analysis to capacitor group operational factor and single capacitor operational factor, the understanding of operation conditions such as reached whether the electrolysis condenser group exists the combined floodgate overvoltage, shoves, the separating brake bang is worn, whether harmonic wave exceeds standard, understand single capacitor and whether have fault, the process of record trouble development, also warning.Capacitor group and single capacitor failure process and reason are more clearly reflected, thereby carry out targetedly and implement modification measures and improve the capacitor operational reliability.Use the utility model capacitor state monitoring method can very judge the operation conditions of capacitor device fast and accurately, in time find fault capacitor and device problems in running, avoid capacitor group fault to enlarge, and improve capacitor group operation level.
Description of drawings
Fig. 1 is the fundamental diagram of the utility model embodiment.
Fig. 2 is the current sensor mounting means synoptic diagram among Fig. 1.
Fig. 3 is the utility model embodiment floating model difference value method block diagram.
Embodiment
Below in conjunction with drawings and Examples the utility model floating model difference value high-voltage capacitor state monitoring device is described further.
The explanation of mark among Fig. 1: 1-high-voltage capacitor (being C), 2-current sensor (being CT), the 3-voltage transformer (VT) (is T V), 4-terminal strip, 5-cable, 6-capture card, 7-computing machine and data handling system, L A, L B, L C-reactor.
The explanation of mark among Fig. 2: 8-sleeve pipe.
As shown in Figure 1, the utility model embodiment floating model difference value high-voltage capacitor state monitoring device comprises tested high-voltage capacitor 1, current sensor 2, voltage transformer (VT) 3, terminal strip 4, cable 5, capture card 6 and computing machine and data handling system 7; Current sensor 2 is loaded on 1 one sleeve pipe 8 roots of high-voltage capacitor, and independent separately parallel connection was delivered on the terminal strip 4 after the running current signal of high-voltage capacitor 1 was changed by current sensor 2; Voltage transformer (VT) 3 is in parallel with high-voltage capacitor 1, and independent separately parallel connection was delivered on the terminal strip 4 after the high-voltage signal on the high-voltage capacitor 1 was transformed by voltage transformer (VT) 3; The signal that current sensor 2 and voltage transformer (VT) 3 transmit is delivered on the capture card 6 by cable 5 through terminal strip 4, after capture card 6 is finished analog-to-digital conversion, by cable 5 digital signal is passed in computing machine and data handling system 7, forms the observation circuit synoptic diagram.
One utmost point of every high-voltage capacitor 1 (on the sleeve pipe 8) is installed a current sensor 2.M current sensor 2 used in 1 parallel connection of every phase M platform high-voltage capacitor.
By the running current signal of foregoing circuit A, B, the tested high-voltage capacitor 1 of C three-phase, by current sensor 2 high voltage is isolated, and after being converted to the little current signal of low pressure, independent separately parallel connection is delivered on the terminal strip 4; After 3 in voltage transformer (VT) was converted into low-voltage signal with the high-voltage signal on the capacitor, independent separately parallel connection was delivered on the terminal strip 4, be beneficial to cable 5 connect send and electric current, voltage between mutual comparison, calculating.Each electric current, voltage signal are delivered on the capture card 6 will be converted into digital signal by certain number order, send into computing machine by cable 5 again and data handling system 7 is analyzed, calculated and judges.The working power of computing machine and data handling system 7 and capture card 6 is supplied with by outside independent current source, thereby make computing machine and data handling system 7 and capture card 6 high-voltage capacitors 1 be in what state all in the collection of carrying out data, storage, differentiate, refresh situation, and can not lose the quick change procedure of any transient state, effective especially to the closing of high-voltage capacitor 1, separating brake failure process record.
Since every tested high-voltage capacitor 1 all be covered with one independently, can finish the current sensor 2 of potential isolation and current signal conversion.Therefore, can directly obtain to reflect the signal message of the running quality situation of every tested high-voltage capacitor 1, improve sensitivity, the accuracy of monitoring greatly.Process is imported all signals into computing machine and data handling system 7, and obtains all operational factors, the signal message of capacitor group, thereby reaches to each tested high-voltage capacitor 1 purpose that the various running quality parameters of full group capacitor are monitored.
Because 1 number of high-voltage capacitor is numerous, also there is some difference for parameter, and service condition also changes often, so the mould value of each electric current, voltage signal changes.If directly judge the quality condition of tested high-voltage capacitor 1 with the variable quantity of mould value, Consideration too much, be difficult to effectively, draw accurately, delicately the operation conditions of tested high-voltage capacitor 1.For solving this difficult problem, the utility model embodiment adopts the floating model difference value method to handle each voltage, current signal, be that the mould value that each current sensor 2 and voltage transformer (VT) 3 measure is not done the fault distinguishing standard, but current-mode value or voltage-mode value that different high-voltage capacitors 1 are measured are subtracted each other separately or subtracted each other mutually, draw the difference of these mould values.Promptly as shown in Figure 3 electric current, the voltage signal of electric current, voltage signal or the same passage of different passages subtracted each other, obtain the differential mode value under its various situations.The various operation conditionss that reflect tested high-voltage capacitor 1 thus are as combined floodgate, separating brake, capacitor fault transient process unbalance condition etc.The mould value then is used for frequency analysis, calculating, thereby makes sensitive monitoring, accurate, reliable, can not disturb because of external factor and judge by accident.
Adopt sleeve pipe 8 roots of every high-voltage capacitor 1 that a current sensor 2 all is installed, directly obtain the running current parameter (mould value) of a certain high-voltage capacitor 1.These parameters (mould value) are though can change with service condition, and the difference of these parameters (mould value) does not then become with service condition, have only fault case certain difference to occur just can going out and change.And voltage signal is from voltage transformer (VT) 3, and its mould value also can change with service condition, but the difference of mould value is constant substantially under normal running (operation) conditions, have only transient state process to occur as close a floodgate, bigger differential mode just can take place and change in separating brake.
Computing machine and data handling system 7 are handled differentiation with signals such as the voltage that collects, electric currents, and the mould value of curtage changes with service condition.In case when finding that certain difference appears in the mould value, then think to have transient state process or fault, be about to its record, store, it is analyzed comparison.Fault causes, then gives the alarm in this way.And as long as the difference before and after the mould value of curtage is not more than certain value, or many current-mode values difference of subtracting each other mutually is when being not more than certain value, when promptly difference does not appear exceeding standard in the mould value, then thinks non-fault or non-transient process, do not note down or stores.Can save a large amount of memory spaces and computer CPU resource like this, and improve the recording processing speed of computing machine and 7 pairs of transient state processes of data handling system, also carrying out computational analysis such as frequency analysis to computing machine and data handling system 7 provides support.

Claims (3)

1, floating model difference value high-voltage capacitor state monitoring device comprises tested high-voltage capacitor, current sensor, voltage transformer (VT) or discharge coil, it is characterized in that: also comprise terminal strip, capture card and computing machine and data handling system; A current sensor is installed on the sleeve pipe of every high-voltage capacitor, and independent separately parallel connection was delivered on the terminal strip after the running current signal of high-voltage capacitor was changed by current sensor; Voltage transformer (VT) or discharge coil are in parallel with high-voltage capacitor, and independent separately parallel connection was delivered on the terminal strip after the high-voltage signal on the high-voltage capacitor was transformed by voltage transformer (VT) or discharge coil; The voltage, the current signal that pass to terminal strip are sent on the capture card, after capture card is finished analog-to-digital conversion, digital signal are passed in computing machine and data handling system.
2, floating model difference value high-voltage capacitor state monitoring device according to claim 1 is characterized in that: current sensor is loaded on a ferrule boot of high-voltage capacitor.
3, floating model difference value high-voltage capacitor state monitoring device according to claim 2 is characterized in that: current sensor is to clamp or sleeve structure.
CNU2009200835034U 2009-01-20 2009-01-20 Condition monitoring device for floating mold difference high-voltage capacitor Expired - Lifetime CN201344959Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2009200835034U CN201344959Y (en) 2009-01-20 2009-01-20 Condition monitoring device for floating mold difference high-voltage capacitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2009200835034U CN201344959Y (en) 2009-01-20 2009-01-20 Condition monitoring device for floating mold difference high-voltage capacitor

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102539961A (en) * 2010-12-20 2012-07-04 矢崎总业株式会社 Apparatus for detecting fault of flying capacitor of insulated condition detecting unit
CN101477160B (en) * 2009-01-20 2012-07-04 武汉电联电力电气技术有限公司 Floating model difference value high-voltage capacitor state monitoring method and apparatus thereof
CN102955089A (en) * 2012-11-16 2013-03-06 四川电力科学研究院 Online monitoring device applied to voltage limiter in series compensation capacitor and method thereof
CN102967775A (en) * 2011-09-01 2013-03-13 武汉电联电力电气技术有限公司 Method for monitoring state of high-voltage capacitors in floating module difference method
CN108352779A (en) * 2015-10-29 2018-07-31 Abb瑞士股份有限公司 The sensing of capacitor in transverter fails

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101477160B (en) * 2009-01-20 2012-07-04 武汉电联电力电气技术有限公司 Floating model difference value high-voltage capacitor state monitoring method and apparatus thereof
CN102539961A (en) * 2010-12-20 2012-07-04 矢崎总业株式会社 Apparatus for detecting fault of flying capacitor of insulated condition detecting unit
CN102539961B (en) * 2010-12-20 2014-09-03 矢崎总业株式会社 Apparatus for detecting fault of flying capacitor of insulated condition detecting unit
CN102967775A (en) * 2011-09-01 2013-03-13 武汉电联电力电气技术有限公司 Method for monitoring state of high-voltage capacitors in floating module difference method
CN102955089A (en) * 2012-11-16 2013-03-06 四川电力科学研究院 Online monitoring device applied to voltage limiter in series compensation capacitor and method thereof
CN102955089B (en) * 2012-11-16 2016-04-06 国网四川省电力公司电力科学研究院 For on-Line Monitor Device and the method thereof of voltage limiter in series capacitor compensation
CN108352779A (en) * 2015-10-29 2018-07-31 Abb瑞士股份有限公司 The sensing of capacitor in transverter fails

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Granted publication date: 20091111

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