CN104092189A - Reactive power compensation protective device in power transmission and transformation system - Google Patents
Reactive power compensation protective device in power transmission and transformation system Download PDFInfo
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- CN104092189A CN104092189A CN201410379334.4A CN201410379334A CN104092189A CN 104092189 A CN104092189 A CN 104092189A CN 201410379334 A CN201410379334 A CN 201410379334A CN 104092189 A CN104092189 A CN 104092189A
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a reactive power compensation protective device in a power transmission and transformation system, and belongs to the technical field of reactive power compensation in the power transmission and transformation system. The technical scheme is that a plurality of single capacitors (11) are connected in parallel to form string sections of high-voltage parallel capacitor groups; each string section is connected with a discharging coil (12) in parallel; a current unit (16) which contains a current sensor is arranged on each capacitor branch of each single capacitor; a background host processes received current signals of all the current units and received voltage signals of all the discharging coils, and transmits data to a protective module. According to the reactive power compensation protective device in the power transmission and transformation system, the sensitive protection on discharging coil failures and each capacitor can be realized; the most sensitive protection and failure warning on the high-voltage parallel capacitor groups can also be realized earliest; the reuse rate of reaction equipment is improved; the operation reliability of a reactive compensation device is improved; major failures are avoided as far as possible; the protection sensitivity is improved; failure equipment is cut in time; serious failures are avoided.
Description
Technical field
The present invention relates to the protective device of reactive power compensation in a kind of power transmission and transformation system, belong to reactive power compensation technology field in power transmission and transformation system.
Background technology
In electric power system, the application of reactive power compensation is very extensive, is the principal mode that improves power factor of electric network, improves grid voltage quality, compensation network reactive power; Along with the development of electrical network, its transmission capacity constantly increases, and reactive power compensation demand strengthens, the chief component parts in reactive power compensator: the application of high voltage large capcity capacitor group is more and more.But, operating experience shows that the accidents such as high voltage large capcity capacitor group generation bulge and blast are of common occurrence, for example: the statistics of continuous 9 years that Northeast China Power Grid provides, in 220kV transformer station, the damage number of capacitor blast and bulge accounts for whole capacitor and damages 35.39% of number, and it is all more complete that the corollary equipment of capacitor group of this type of accident occurs.As can be seen here, there is larger accident potential in high voltage large capcity capacitor group, and its protected mode can not meet the requirement of safe and reliable operation completely.At present, the protected mode of reactive power compensator has 4 kinds: open delta voltage protection; Phase voltage differential protection; The protection of neutral point unsymmetrical current; The protection of bridge-type spill current.
Wherein, open delta voltage protection is a kind of protected mode that Small And Medium Capacity reactive power compensator (20Mvar and following) is conventional, and in 10kV electric pressure, application at most.The extremely difficult capacitor group that is applied to multi-stage series of this protected mode, reason is: because the voltage change ratio of discharge coil is large, protection actuating signal is little, protection setting value is difficult to coordinate with fuse in capacitor; Discharge coil three-phase performance difference and power supply three-phase imbalance all can produce initial unbalance voltage, will greatly reduce protection sensitivity; In addition,, during for many string sections, Insulation Problems is very complicated, is difficult to solve.
The comparison in equipment complexity that phase voltage differential protection uses, special circumstances need to increase voltage amplification loop is set, and when symmetric fault, protection can not be moved.The sensitivity of this protection also will be subject to the impact of discharge coil performance; In the time that the series block of capacitor group increases, protection sensitivity significantly reduces, and the scope of application is restricted.
When neutral point unsymmetrical current capacitor for voltage protection group is installed, balancing bothers; When symmetric fault, protection is failure to actuate.Exceed the capacitor group of 20Mvar for current common capacity, due to protection insufficient sensitivity, occurred many accidents.
Although the protection of bridge spill current is slightly high compared with the sensitivity of other three kinds of protected modes, in the time there is symmetric fault, this protection is failure to actuate.And operating experience also shows that its protection sensitivity still can not meet the requirement of safe operation in large capacity, many string sections, capacitor number of units capacitor group how.In addition, bridge-type spill current protection and the protection of neutral point unsymmetrical current are for the discharge coil of configuration without any protection, and discharge coil is in such cases in protecting blind area.Because discharge coil often will bear switching overvoltage, operational environment is more severe, and not monitoring and safeguard measure of discharge coil in practical application, and the situation that the capacitor group that discharge coil fault causes can not bringing normally into operation also more a generation.At present, is both at home and abroad that periodic test detects to the detection of discharge coil, be generally after overhaul or the stipulated time is carried out the tests such as insulation resistance, withstand voltage test, voltage ratio, lack reliable Real-Time Monitoring and salvo.
Although open delta and phase voltage are differential, discharge coil fault is had to certain reaction, this protected mode is mainly the protection for the Shunt Capacitor Unit of low-voltage low capacity.
In addition, each capacitor group is made up of many Parallel-connected Capacitors, and these several protective devices are in the time that a small amount of capacitor breaks down, and due to very little on the impact of integral capacitor device group, the insufficient sensitivity of protective device, does not accomplish effective protection.The more important thing is: high-voltage parallel capacitor group is topmost parts in reactive power compensator; its fault starts from the electric capacitance change of single capacitor often; and all these current guard methods are all for having occurred catastrophe failure protection afterwards; for the protection of whole group capacitor, can not realize the protection for every capacitor especially.And often fault is started by single parts, current protective device all can not provide effective protection.
Summary of the invention
The object of the invention is to provide the protective device of reactive power compensation in a kind of power transmission and transformation system; by monitoring the electric current of each capacitor (or each capacitor branch road) and monitoring the secondary voltage that is connected in parallel on the discharge coil in capacitor group; realize non-blind area; high-sensitive reactive power compensation, solves the problem existing in background technology.
Technical scheme of the present invention is:
The protective device of reactive power compensation in a kind of power transmission and transformation system, each single capacitor forms a capacitor branch road, multiple single capacitors string section that forms high-voltage parallel capacitor group in parallel, multiple string sections are serial or parallel connection layout each other, and each string Duan Jun is arranged in parallel discharge coil; On the capacitor branch road of each single capacitor all install contain current sensor current unit, current sensor gathers the current signal of this capacitor branch road, current unit by gather current signal transfer to background host computer; Discharge coil is with aftertreatment unit, and the voltage signal of aftertreatment unit transfers to background host computer; Background host computer is to receiving the current signal of all current units and the voltage signal of all discharge coils is processed, and data are gone to protection module.
Protection module is processed described data, all protects action; Or protection module is processed data, control the state of protection node, protect action by transforming plant protecting system according to the state of protection node.
Background host computer, according to data variation, is controlled protection node state; Transforming plant protecting system (transformer station the is original) state of monitoring and protecting node at any time, if any state variation, protects action (public protection scheme) according to presetting scheme.
Current unit is hollow, is directly sleeved on the outlet casing tube of capacitor, is connected to aftertreatment unit in the secondary winding of discharge coil, and the signal of current unit and aftertreatment unit transfers in background host computer by wireless-transmission network.
Described current unit is with power subsystem, and current signal is transformed into digital signal.
Transmission means between described current unit and background host computer comprises: wireless, or optical fiber, or the mode of signal cable, or its compound mode.
Described capacitor branch road at least comprises a capacitor, or consists of series-parallel system many capacitors.
Between the aftertreatment unit of described discharge coil and background host computer, transmission means comprises: wireless, or optical fiber, or the mode of signal cable, or its compound mode.
Described power subsystem adopts configuration in current unit to get and can obtain power supply or obtain power supply by photovoltaic by coil automatic electricity getting.
The present invention is also provided with air core reactor, lightning arrester and earthed switch, and multiple string sections each other serial or parallel connection cloth postpone are connected with air core reactor, lightning arrester, earthed switch.
The protective device of reactive power compensation provided by the invention, can realize the sensitivity protection for discharge coil fault, and in the time that discharge coil breaks down, its secondary output voltage must change, and directly in guard method, is reflected.And carry out Real-Time Monitoring for the capacitance of each capacitor or each capacitor branch road, limit realizes the sensitivity protection for high-voltage parallel capacitor group the earliest.
The present invention is by the variation of monitoring discharge coil secondary voltage, and obtains the variation of the capacitance of each capacitor in conjunction with the current value of each capacitor, realizes for reactive power compensator and carries out sensitivity protection.The present invention can realize the sensitivity protection for discharge coil fault and each capacitor, and also limit realizes sensitivity protection and the fault pre-alarming for high-voltage parallel capacitor group the earliest.What the present invention can improve reactive apparatus uses rate again, improves the operational reliability of reactive power compensator, avoids as far as possible the generation of significant trouble.Use of the present invention will improve the sensitivity of protection greatly, and disengagement failure equipment, avoids causing catastrophe failure in time, thereby improves transmission line power supply reliability, will bring good social benefit.
Brief description of the drawings
Fig. 1 is embodiment of the present invention schematic diagram;
In figure: single capacitor 11, discharge coil 12, air core reactor 13, lightning arrester 14, earthed switch 15, current unit 16, aftertreatment unit 17, wireless-transmission network 18, background host computer 19, protection node 110, transforming plant protecting system 111.
Embodiment
Below in conjunction with accompanying drawing, by example, the invention will be further described.
Embodiment is the wherein primary structure figure of a phase of a 35kV reactive power compensator, the actual two-way that is divided into of its high-voltage parallel capacitor, every road two string sections, in figure 11 is each capacitor, do not do independent differentiation, the 12nd, the discharge coil of corresponding each series block, the 13rd, air core reactor, the 14th, lightning arrester, the 15th, earthed switch, 16 are mounted in the current unit on each capacitor, the 17th, the aftertreatment unit of discharge coil 12, the 18th, wireless-transmission network, the 19th, background host computer, the 110th, protection node, the 111st, transforming plant protecting system (relay protecting system).
The protective device of reactive power compensation in a kind of power transmission and transformation system, each single capacitor forms a capacitor branch road, multiple single capacitors 11 string section that forms high-voltage parallel capacitor group in parallel, multiple string sections are serial or parallel connection layout each other, and each string Duan Jun is arranged in parallel discharge coil 12; On the capacitor branch road of each single capacitor all install contain current sensor current unit 16, current sensor gathers the current signal of this capacitor branch road, current unit by gather current signal transfer to background host computer 19; Discharge coil is with aftertreatment unit, and the voltage signal of aftertreatment unit transfers to background host computer; Background host computer is to receiving the current signal of all current units and the voltage signal of all discharge coils is processed, and data are gone to protection module;
Protection module is processed described data, all protects action; Or protection module is processed data, control the state of protection node 110, protect action by transforming plant protecting system 111 according to the state of protection node.
Background host computer 19, according to data variation, is controlled protection node 110 states; Transforming plant protecting system 111(transformer station is original) state of monitoring and protecting node 110 at any time, if any state variation, protect action (public protection scheme) according to presetting scheme.
Current unit 16 is hollow, directly be sleeved on the outlet casing tube of single capacitor 11, in the secondary winding of discharge coil 12, be connected to aftertreatment unit 17, the signal of current unit 16 and aftertreatment unit 17 transfers in background host computer 19 by wireless-transmission network 18.
Described current unit is with power subsystem, and current signal is transformed into digital signal.
Transmission means between described current unit and background host computer comprises: wireless, or optical fiber, or the mode of signal cable, or its compound mode.
Described capacitor branch road at least comprises a capacitor, or consists of series-parallel system many capacitors.
Between the aftertreatment unit of described discharge coil and background host computer, transmission means comprises: wireless, or optical fiber, or the mode of signal cable, or its compound mode.
Described power subsystem adopts configuration in current unit to get and can obtain power supply or obtain power supply by photovoltaic by coil automatic electricity getting.
The present invention is also provided with air core reactor 13, lightning arrester 14 and earthed switch 15, and multiple string sections each other serial or parallel connection cloth postpone are connected with air core reactor 13, lightning arrester 14, earthed switch 15.
In an embodiment, current unit 16 contains two coils, and one is self-energizing coil, after be connected to power module, give other modules power supply is provided; Another is measuring coil, and power subsystem 16 first does A/D conversion to its signal, and the stored data that can circulate on the spot as required, and data after treatment, transfer to background host computer 19 by waveform or its features relevant value by wireless-transmission network 18.
Aftertreatment unit 17 contains power module, directly in the secondary winding output of discharge coil 12, obtain power supply, and the secondary singal of discharge coil 12 is done to A/D conversion, and the stored data that can circulate on the spot as required, data after treatment, transfer to background host computer 19 by waveform or its features relevant value by wireless-transmission network 18.
Background host computer 19 is receiving after all signals, and the storage relevant data that can circulate as required waits data analysis, contrast, carrys out the state of operation protection node 110 according to predefined threshold values.
In this invention implementation process, wireless-transmission network 18 also can substitute with optical fiber or signal cable; The present embodiment of obtaining for voltage signal is to adopt discharge coil to be equipped with the method for secondary winding, aftertreatment unit, but also can adopt other modes such as voltage transformer, CVT, voltage divider to obtain; Power subsystem also can be obtained by modes such as opto-electronic conversion, battery, feed cables in the present embodiment; Multiple current units can share a power module, etc. multiple variations.
Claims (7)
1. the protective device of reactive power compensation in a power transmission and transformation system, it is characterized in that: each single capacitor forms a capacitor branch road, multiple single capacitors (11) string section that forms high-voltage parallel capacitor group in parallel, multiple string sections serial or parallel connection layout each other, each string Duan Jun is arranged in parallel discharge coil (12); On the capacitor branch road of each single capacitor all install contain current sensor current unit (16), current sensor gathers the current signal of this capacitor branch road, current unit by gather current signal transfer to background host computer (19); Discharge coil is with aftertreatment unit, and the voltage signal of aftertreatment unit transfers to background host computer; Background host computer is to receiving the current signal of all current units and the voltage signal of all discharge coils is processed, and data are gone to protection module;
Protection module is processed described data, taps into row protection action; Or protection module is processed data, control the state of protection node (110), protect action by transforming plant protecting system (111) according to the state of protection node.
2. the protective device of reactive power compensation in a kind of power transmission and transformation system according to claim 1; it is characterized in that: current unit (16) is hollow; directly be sleeved on the outlet casing tube of single capacitor (11); in the secondary winding of discharge coil (12), be connected to aftertreatment unit (17), the signal of current unit (16) and aftertreatment unit (17) transfers in background host computer (19) by wireless-transmission network (18).
3. the protective device of reactive power compensation in a kind of power transmission and transformation system according to claim 1, is characterized in that: described current unit is with power subsystem, and current signal is transformed into digital signal.
4. the protective device of reactive power compensation in a kind of power transmission and transformation system according to claim 1, is characterized in that: the transmission means between described current unit and background host computer comprises: wireless, or optical fiber, or the mode of signal cable, or its compound mode.
5. the protective device of reactive power compensation in a kind of power transmission and transformation system according to claim 1; it is characterized in that: between the aftertreatment unit of described discharge coil and background host computer, transmission means comprises: wireless; or optical fiber, or the mode of signal cable, or its compound mode.
6. the protective device of reactive power compensation in a kind of power transmission and transformation system according to claim 1, is characterized in that: described capacitor branch road at least comprises a capacitor, or consists of series-parallel system many capacitors; Described power subsystem adopts configuration in current unit to get and can obtain power supply or obtain power supply by photovoltaic by coil automatic electricity getting.
7. the protective device of reactive power compensation in a kind of power transmission and transformation system according to claim 1; it is characterized in that: be also provided with air core reactor (13), lightning arrester (14) and earthed switch (15), multiple string sections each other serial or parallel connection cloth postpone are connected with air core reactor, lightning arrester, earthed switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410379334.4A CN104092189A (en) | 2014-08-05 | 2014-08-05 | Reactive power compensation protective device in power transmission and transformation system |
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| CN201410379334.4A CN104092189A (en) | 2014-08-05 | 2014-08-05 | Reactive power compensation protective device in power transmission and transformation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464692A (en) * | 2017-08-03 | 2017-12-12 | 无锡市电力滤波有限公司 | A kind of protective relaying device and its method of dry-type high-voltage self-healing type parallel condenser |
| CN109818360A (en) * | 2019-02-27 | 2019-05-28 | 中国地质科学院地球物理地球化学勘查研究所 | Combination capacitor compensation device and connection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771225A (en) * | 1986-03-26 | 1988-09-13 | Kabushiki Kaisha Toshiba | Device for limiting switching frequency of a parallel capacitor reactive power compensation network |
| CN2691138Y (en) * | 2004-02-09 | 2005-04-06 | 南通现代电力科技有限公司 | Secondary swithch type 6KV and 10KV static reactive compensator |
| CN202564961U (en) * | 2012-03-31 | 2012-11-28 | 上海市电力公司 | European box-type transformer reactive power compensation device |
| CN103412229A (en) * | 2013-08-30 | 2013-11-27 | 华北电力大学（保定） | Fault locating method of parallel compensation capacitor bank |
| CN103592554A (en) * | 2013-12-03 | 2014-02-19 | 武汉大学 | On-line monitoring system and method of 35kV high voltage shunt capacitor |
-
2014
- 2014-08-05 CN CN201410379334.4A patent/CN104092189A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771225A (en) * | 1986-03-26 | 1988-09-13 | Kabushiki Kaisha Toshiba | Device for limiting switching frequency of a parallel capacitor reactive power compensation network |
| CN2691138Y (en) * | 2004-02-09 | 2005-04-06 | 南通现代电力科技有限公司 | Secondary swithch type 6KV and 10KV static reactive compensator |
| CN202564961U (en) * | 2012-03-31 | 2012-11-28 | 上海市电力公司 | European box-type transformer reactive power compensation device |
| CN103412229A (en) * | 2013-08-30 | 2013-11-27 | 华北电力大学（保定） | Fault locating method of parallel compensation capacitor bank |
| CN103592554A (en) * | 2013-12-03 | 2014-02-19 | 武汉大学 | On-line monitoring system and method of 35kV high voltage shunt capacitor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464692A (en) * | 2017-08-03 | 2017-12-12 | 无锡市电力滤波有限公司 | A kind of protective relaying device and its method of dry-type high-voltage self-healing type parallel condenser |
| CN107464692B (en) * | 2017-08-03 | 2023-01-17 | 无锡市电力滤波有限公司 | Relay protection device and method for dry-type high-voltage self-healing parallel capacitor |
| CN109818360A (en) * | 2019-02-27 | 2019-05-28 | 中国地质科学院地球物理地球化学勘查研究所 | Combination capacitor compensation device and connection method |
| CN109818360B (en) * | 2019-02-27 | 2021-04-30 | 中国地质科学院地球物理地球化学勘查研究所 | Combined capacitance compensation device and connection method |
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Application publication date: 20141008 |