CN107332254A - A kind of power capacitor Quick discharger of low-power consumption - Google Patents

A kind of power capacitor Quick discharger of low-power consumption Download PDF

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Publication number
CN107332254A
CN107332254A CN201710678198.2A CN201710678198A CN107332254A CN 107332254 A CN107332254 A CN 107332254A CN 201710678198 A CN201710678198 A CN 201710678198A CN 107332254 A CN107332254 A CN 107332254A
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CN
China
Prior art keywords
resistance
power
winding
choking
capacitance
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
CN201710678198.2A
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Chinese (zh)
Inventor
王联喜
余卫华
程冬秀
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to CN201710678198.2A priority Critical patent/CN107332254A/en
Publication of CN107332254A publication Critical patent/CN107332254A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a kind of power capacitor Quick discharger of low-power consumption, it is related to power network alternating electromotive force reactive power compensation technology field.It includes circuit unit, circuit unit includes choking-winding, discharge resistance and RC resistance-capacitance overvoltage absorbers, connected again with discharge resistance after choking-winding is in parallel with RC resistance-capacitance overvoltage absorbers, described RC resistance-capacitance overvoltage absorbers include Absorption Capacitance and absorption resistance, and Absorption Capacitance is then parallelly connected with choking-winding two ends after being connected with absorption resistance；Three groups of circuit units access the A/B/C ports of three-phase capacitor in the hanging star-like mode of neutral point.Absorption Capacitance uses rated voltage 630V, and capacity 0.1uF ceramic condensers, described absorption resistance uses power 1W carbon resistance.Described choking-winding uses EI type single winding transformer coils, and input rated voltage is AC 250V.Present invention operation small power consumption；Stable operation, without maintenance；Cost is low,<15 yuan/set；Discharge time is short.

Description

A kind of power capacitor Quick discharger of low-power consumption
Technical field
The present invention relates to power network alternating electromotive force reactive power compensation technology field, and in particular to one kind is suitable for voltage class Below 1000V power capacitor, is adapted to the low-power consumption in the reactive-load compensation equipments such as public affairs change, special customer, transformer station, power station Power capacitor Quick discharger.
Background technology
High and low pressure alternating electromotive force capacitor, all not in its band residual charge in the case of close a floodgate；Otherwise, closing a floodgate Moment, power network input potential be possible to anti-phase with capacitor residual voltage potential, can be produced when its potential difference values is very big high current rush Hit, in addition to switch trip, the damage of disconnecting link excessively stream, capacitor blast is caused, spike can also interfere with the normal operation of control device, Even occurs accident.So《DL/T1417-2015 low-voltage reactive compensator operating standards》Regulation, power capacitor reclosing Before, it is necessary to be substantially discharged, common practices is in the end of capacitor two discharge resistance in parallel.
Secondary capacitor product standard is provided：Discharge time as defined in reaching required for residual voltage is≤3min, and electric discharge is opened The voltage during beginning is risen by power-frequency voltage peak value √ 2Un is discharged to 75V through 3min.Calculate electric discharge device resistance value method be：
R --- discharge resistance, to secondary capacitor discharge resistance Y connections, R is the M Ω per phase resistance；
T --- discharge time, min；
K --- connection factor；
Un--- rated voltage, generally 400V；
C --- per phase electric capacity, μ F；
UR--- residual voltage, V.
It is 3 that COEFFICIENT K connects discharge resistance for Δ connection capacitor and Y in formula.
It is worth each in substitution formula, and is folded to three-phase capacitor total capacity and obtains
In formula, R --- Y connections are per phase discharge resistance value；
Qc--- Δ connection capacitor three-phase total capacity, kvar.
Such as above formula, capacitor discharge resistance is smaller, though discharge time is shorter, discharge resistance power consumption is got over when capacitor is put into Greatly；Discharge resistance is bigger, and although discharge resistance power consumption have dropped, but the discharge time of capacitor bank then extends.Therefore it is a lot The compromise way of capacitor manufacturer is the discharge resistance using 200K, and the discharge time of such low capacity electric capacity can also connect By, but when condenser capacity is larger, then discharge time or long；According to surveying and determination, the capacitor bank of existing compensation device is averaged Action delay is 40 seconds, and when the fluctuation of power customer reactive load is frequent, compensation device is because will wait capacitor set discharge complete Into, thus can not real-time tracking compensation, cause overcompensation, undercompensation phenomenon, thus a kind of cost of market in urgent need is low, stability is high, The power capacitor Quick discharger of the simple Maintenance free of circuit.
The content of the invention
It is an object of the invention to provide power capacitor in a kind of reactive-load compensation equipment after a resection can repid discharge, in electricity The power capacitor Quick discharger of the low-power consumption of low power operation when power capacitor is put into.
In order to solve the problems existing in background technology, the present invention is to use following technical scheme：A kind of electricity of low-power consumption Power fast electric discharge device of capacitor, it includes circuit unit, and described circuit unit includes choking-winding, discharge resistance and RC resistances Hold surge absorber, connected again with discharge resistance after choking-winding is in parallel with RC resistance-capacitance overvoltage absorbers；Three groups of circuit lists Member accesses the A/B/C ports of three-phase capacitor in the hanging star-like mode of neutral point.
As a further improvement on the present invention；Described choking-winding uses EI type single winding transformer coils, the amount of imports Voltage is determined for AC250V；
As a further improvement on the present invention；Described discharge resistance uses the cement resistor of lead type ceramic package.
As a further improvement on the present invention；Described RC resistance-capacitance overvoltage absorbers are comprising Absorption Capacitance with absorbing electricity Resistance, Absorption Capacitance is then parallelly connected with choking-winding two ends after being connected with absorption resistance.
After adopting the above technical scheme, the invention has the advantages that：
The present invention is when compensating power capacitor input, and high impedance is presented in the exchange input of the inductance of choking-winding to 50Hz Characteristic (about 650k Ω), the power consumption of discharge circuit is extremely low (0.08W)；When compensation capacitor is cut off, capacitor is to device circuit Direct-current discharge, because Low ESR (4.68k Ω) is presented in choking-winding, shortens discharge time；RC capacitance-resistances overvoltage absorbs Device can effectively suppress moment sensing high voltage, moment high frequency of oscillation electric current of the choking-winding in disconnection, make the waveform of overvoltage Slow down, steepness and amplitude reduction；Along with the damping action of absorption resistance, the higher-order of oscillation is decayed rapidly, make controller, electric power The equipment such as capacitor avoid insulation damages and noise jamming caused by switching overvoltage, it is ensured that equipment safety operation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the power capacitor Quick discharger schematic diagram of low-power consumption in the prior art；
Fig. 2 is the top view of embodiment provided by the present invention；
Fig. 3 is the side view of embodiment provided by the present invention；
Reference：
1- choking-windings；2- discharge resistances；The absorption resistance of 3-RC resistance-capacitance overvoltage absorbers；4-RC capacitance-resistances overvoltage is inhaled Receive the Absorption Capacitance of device；5- three-phase power capacitor banks；6- fling-cut switches；7- electric discharge devices are buckled；8- capacitor bank wiring piles； 9- connecting wires；10- electric discharge device outer box.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and specific implementation Mode, the present invention will be described in further detail.It should be appreciated that embodiment described herein is only to explain this Invention, is not intended to limit the present invention.
Fig. 2, Fig. 3 are referred to, present embodiment uses following technical scheme：It includes choking-winding 1, discharge resistance 2nd, absorption resistance 3, Absorption Capacitance 4, three-phase power capacitor bank 5, fling-cut switch 6, electric discharge device buckle 7, capacitor bank wiring Stake 8, connecting wire 9 and electric discharge device outer box 10, choking-winding 1 and the RC capacitance-resistances that absorption resistance 3, Absorption Capacitance 4 are constituted are excessively electric Connected again with discharge resistance 2 after pressure absorber is in parallel, built-up circuit unit；In star-like mode, (neutral point hangs three groups of circuit units It is empty) the A/B/C wiring piles 8 of three-phase power capacitor bank 5 are accessed, then fling-cut switch 6 is accessed by connecting wire 9.
Referring to Fig. 2, (long 108mm, wide 25mm, high 35mm), three groups is made by flame-proof ABS plastics in electric discharge device outer box 10 Circuit unit is embedded in electric discharge device outer box 10 side by side, and buckles 7 by electric discharge device and be fixed on the prominent of three-phase power capacitor bank 5 Edge is played, the side of three-phase power capacitor bank 5 is hung on.
The EI type silicon steel chip size of described choking-winding 1 is 28.5mm length, 25.6mm is wide, 11mm is thick, nominal operation electricity Flow for 0.01A, maximum direct-current discharge electric current is 0.015A, D.C. resistance is 4.68k Ω, the circle of coil turn 2150, primary coil Diameter of wire is 0.24mm.
Described Absorption Capacitance 4 uses rated voltage 630V, and capacity 0.1uF ceramic condensers, described absorption resistance 3 is used Power 1W carbon resistance.
Described discharge resistance 2 is in use, the capacitor of 6kvar (450V) and following capacity selects 3W power 47k Ω's Discharge resistance, the capacitor selection 5W power 36k Ω of 6kvar (450V) above capacity discharge resistance.
The present invention principle be：
When compensating power capacitor input, the inductance of choking-winding 1 is to 50Hz exchange input presentation high impedance, low work( Consumption；When compensating power capacitor excision, three-phase power capacitor bank 5 is presented low to device circuit direct-current discharge, choking-winding 1 Impedance, greatly shortens discharge time, so that reactive power compensator is compensated idle real-time tracking；RC capacitance-resistance overvoltage Absorber can effectively suppress moment sensing high voltage of the choking-winding 1 in disconnection.
The present invention possesses following characteristics：
1st, small power consumption is run；
2nd, stable operation, without maintenance；
3rd, cost is low, 15 yuan of ＜/set；
4th, discharge time is short, the discharge time of 6kvar (450V) and following capacity≤3 second, and 7~15kvar (450V)≤ The discharge time of 7 seconds, the discharge time of 16~25kvar (450V)≤15 seconds, during the electric discharge of 26~30kvar (450V)≤20 seconds Between.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art It may be appreciated other embodiment.

Claims (5)

1. a kind of power capacitor Quick discharger of low-power consumption, it includes circuit unit, it is characterised in that described circuit Unit includes choking-winding, discharge resistance and RC resistance-capacitance overvoltage absorbers, and choking-winding and RC resistance-capacitance overvoltage absorbers are simultaneously Connected again with discharge resistance after connection, described RC resistance-capacitance overvoltage absorbers include Absorption Capacitance and absorption resistance, Absorption Capacitance Choking-winding two ends are then parallelly connected with after being connected with absorption resistance；Three groups of circuit units access three in the hanging star-like mode of neutral point The A/B/C ports of phase capacitor.
2. the power capacitor Quick discharger of a kind of low-power consumption according to claim 1, it is characterised in that described Absorption Capacitance uses rated voltage 630V, and capacity 0.1uF ceramic condensers, described absorption resistance is electric using power 1W carbon Resistance.
3. the power capacitor Quick discharger of a kind of low-power consumption according to claim 1, it is characterised in that described Choking-winding uses EI type single winding transformer coils, and input rated voltage is AC250V.
4. the power capacitor Quick discharger of a kind of low-power consumption according to claim 1, it is characterised in that described Discharge resistance uses the capacitor selection 3W power of the cement resistor of lead type ceramic package, 6kvar 450V and following capacity 47k Ω discharge resistance, the capacitor selection 5W power 36k Ω of 6kvar 450V above capacity discharge resistance.
5. the power capacitor Quick discharger of a kind of low-power consumption according to claim 3, it is characterised in that described The EI type silicon steel chip size of choking-winding is 28.5mm length, 25.6mm is wide, 11mm is thick, and rated operational current is 0.01A, maximum straight Stream discharge current is 0.015A, and D.C. resistance is 4.68k Ω, the circle of coil turn 2150, a diameter of 0.24mm of primary wire.
CN201710678198.2A 2017-08-10 2017-08-10 A kind of power capacitor Quick discharger of low-power consumption Pending CN107332254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710678198.2A CN107332254A (en) 2017-08-10 2017-08-10 A kind of power capacitor Quick discharger of low-power consumption

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710678198.2A CN107332254A (en) 2017-08-10 2017-08-10 A kind of power capacitor Quick discharger of low-power consumption

Publications (1)

Publication Number Publication Date
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CN201710678198.2A Pending CN107332254A (en) 2017-08-10 2017-08-10 A kind of power capacitor Quick discharger of low-power consumption

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518598A (en) * 2019-09-02 2019-11-29 国家电网有限公司 A kind of overvoltage elimination system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151674A (en) * 2010-11-29 2011-08-17 江苏紫光吉地达环境科技股份有限公司 Cleaning device for tunnel electrical system
CN102522757A (en) * 2011-12-13 2012-06-27 江门市集雅电器有限公司 Adjustable power capacitor discharge device
JP2014150603A (en) * 2013-01-31 2014-08-21 Panasonic Corp Passive filter and air-conditioner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102151674A (en) * 2010-11-29 2011-08-17 江苏紫光吉地达环境科技股份有限公司 Cleaning device for tunnel electrical system
CN102522757A (en) * 2011-12-13 2012-06-27 江门市集雅电器有限公司 Adjustable power capacitor discharge device
JP2014150603A (en) * 2013-01-31 2014-08-21 Panasonic Corp Passive filter and air-conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518598A (en) * 2019-09-02 2019-11-29 国家电网有限公司 A kind of overvoltage elimination system

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Application publication date: 20171107

RJ01 Rejection of invention patent application after publication