CN203562784U - Reactive compensation device of 10kV line - Google Patents
Reactive compensation device of 10kV line Download PDFInfo
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- CN203562784U CN203562784U CN201320658307.1U CN201320658307U CN203562784U CN 203562784 U CN203562784 U CN 203562784U CN 201320658307 U CN201320658307 U CN 201320658307U CN 203562784 U CN203562784 U CN 203562784U
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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
A reactive compensation device of a 10kV line mainly comprises a control unit, vacuum contactors, capacitors, a voltage transformer, current transformers, lightning arresters and outdoor drop-out fuses. The control unit comprises a controller connected with the voltage transformer capable of collecting high-voltage electric grid cable voltage signals, an outdoor current transformer capable of collecting line current signals and a group of indoor current transformers collecting capacitor current signals. Through a control loop, the controller is connected with a group of the vacuum contactors and further connected with the capacitors capable of completing a switching operation. The reactive compensation device has the advantages of low investment, high earning and feasibility, takes effect rapidly, is capable of reducing line loss greatly and improves power quality.
Description
Technical field
The utility model relates to a kind of reactive power compensator of 10kV circuit, belong to the configuration device technical field of electrical network.
Background technology
Along with developing rapidly of national economy, the power consumption of city net, rural power grids increases increasingly, and the power supply quality of electrical network is more and more subject to the attention of power supply department.The problems such as along with first phase, the second stage of electric network reconstruction complete, the power supply quality of electrical network is greatly improved and improves, and still also exists power factor on the low side, and reactive power compensation is unreasonable, line loss is larger.State Grid Corporation of China requires electric companies at different levels to pay attention to the management of line loss for this reason, and reasonably compensating reactive power, improves power factor, improves grid benefit.
Utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, and provide a kind of, can compensate the reactive power of the power transformer consumption distributing in circuit, thereby reduce the idle conveying of upper level transformer station to 10kV circuit, the power factor that improves distribution line, reaches the reactive power compensator of the 10kV circuit of wastage reducing and energy saving effect on the line.
The purpose of this utility model completes by following technical solution, and it is mainly by control unit, vacuum contactor, capacitor, voltage transformer summation current transformer, lightning arrester, outdoor drop-out fuse composition; It is characterized in that described control unit comprise one respectively with can gather high-tension electricity netting twine voltage signal voltage transformer, can gather the controller that indoor current transformer that the Outdoor Current Transformer of line current signal and one group gathers condenser current signal is connected, this controller is connected with one group of vacuum contactor respectively by control loop and and then is connected and can completes the capacitor that switching moves.
The utility model is serially connected with outdoor drop-out fuse and the lightning arrester that can carry out to device short-circuit protection in capacitor switching loop; B, the C that described voltage transformer is connected to high-voltage fence mutually between, and provide power supply for controller and control loop; Described Outdoor Current Transformer is an outdoor straight-through current transformer, and it is placed on the A phase circuit of high-voltage fence and obtains line current signal.
Controller described in the utility model be one can carry out signal acquisition process and control output, with the single-chip microcomputer of memory, the control loop that described single-chip microcomputer consists of two relay outputs connects vacuum contactor, also be connected with respectively nixie display, operation keyboard, house dog and serial communication interface.
The utility model can compensate the reactive power of the power transformer consumption distributing in circuit, thereby reduces the idle conveying of upper level transformer station to 10kV circuit, improves the power factor of distribution line, reaches wastage reducing and energy saving effect on the line; Have little, the instant effect of investment, income high, practicable, can reduce by a relatively large margin line loss, improve the features such as the quality of power supply.
Accompanying drawing explanation
Fig. 1 is overall structure theory of constitution figure described in the utility model.
Fig. 2 is overall structure composition frame chart described in the utility model.
Fig. 3 is controller architecture composition frame chart described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is shown in detailed introduction: Fig. 1,2, the utility model is mainly by control unit 1, vacuum contactor 2, and capacitor 3, voltage transformer 4 summation current transformers 5, lightning arrester 6, outdoor drop-out fuse 7 forms; Described control unit 1 comprise one respectively with can gather high-tension electricity netting twine voltage signal voltage transformer 4, can gather the controller 11 that indoor current transformer 8 that the Outdoor Current Transformer 5 of line current signal and one group gathers capacitor 3 current signals is connected, this controller 11 is connected with one group of vacuum contactor 2 respectively by control loop 12 and and then is connected and can completes the capacitor 3 that switching moves.
The utility model is serially connected with outdoor drop-out fuse 7 and the lightning arrester 6 that can carry out to device short-circuit protection in capacitor switching loop; B, the C that described voltage transformer 4 is connected to high-voltage fence mutually between, and provide power supply for controller 11 and control loop 12; Described Outdoor Current Transformer 5 is an outdoor straight-through current transformer, and it is placed on the A phase circuit of high-voltage fence and obtains line current signal.
Shown in Fig. 3, controller 11 described in the utility model be one can carry out signal acquisition process and control output, with the single-chip microcomputer 13 of memory 14, the control loop 12 that described single-chip microcomputer 13 consists of two relay outputs connects vacuum contactor 2, also be connected with respectively nixie display 15, operation keyboard 16, house dog 17 and serial communication interface 18.
The utility model can be realized classification switching, makes the reactive power compensation of high-tension line meticulousr.As everyone knows; single group reactive power compensator can not be accomplished meticulous compensation; and though the device of the appearances such as many groups can be accomplished relatively meticulous compensation; it is many that but the group number of its capacitor is wanted; every group capacitor all will be equipped with corresponding switch and protection equipment; the cost that this has just increased equipment greatly, makes the input cost in advance of saving energy and decreasing loss larger, also makes the benefit of saving energy and decreasing loss reduce.If do not used, wait and hold switching, just can greatly reduce equipment cost, make user's maximizing the benefits.Illustrate; compensate the electric capacity of 300kVar; differential is 100kVar; if switching is held in employings etc., just need 3 capacitors and 3 switches, and if adopt not wait and hold switching; adopt the method for a 100kVar of compensation and a 200kVar; just only need two capacitors and two switches, this has just saved 1 switch and 1 and has overlapped the expense of protective device, and has reduced fault point.
The utility model adopts vacuum contactor to carry out switched capacitor.The contact of vacuum contactor is made by special material, is particularly suitable for cut-offfing capacity current.
The utility model also can be realized local control and remote measurement remote regulating by communication modes such as wireless communication module, GPRS or CDMA.
The utility model can be integrated in high-low pressure component in casing separately, user-friendly.
The utility model has very large economic benefit and social benefit, main manifestations after implementing:
1, reduce power loss and the energy loss in electrical network, line power factor rises to 0.98 from 0.84, every degree electricity is according to 0.5 yuan of calculating, if press one-year age operation, calculating that mounting points 1 can reduce expenses is 4.6 ten thousand yuan, utilizes same computational methods, the expense that can calculate mounting points saving in 2 one years is 4.7 ten thousand yuan, therefore, on 10kV Zhushan County 012 line, install additional after reactive power compensation, the expense of saving altogether for a year is 9.3 ten thousand yuan of left and right.
2, improve the power supply capacity of equipment
3, improve the quality of power supply, improve the rate of qualified voltage of 10kV circuit in user's side
4, optimize the above electric network reactive-load trends at different levels of 10kV, improve electric fail safe and stable
5,, due to the raising of power supply quality, can encourage the enthusiasm of users' electricity consumption.
Embodiment:
10kV pole-mounted reactive compensation device, is exactly the actual state according to electrical network, utilizes the compensating action of reactive power source, realizes voltage power-less Comprehensive Control, for improving rate of qualified voltage and reducing network loss, has very large effect.The method of its employing shunt capacitor, can carry out auto-compensation to the reactive loss of 10kV transmission line, can stablize again line voltage distribution.After having utilized computer network and mechanics of communication, can realize remote monitoring and Long-distance Control to automatic control equipment simultaneously, from truly having improved the automation of electrical power trans mission/distribution system, the economic benefit of the system that increases electric power.
Therefore, the optimum position of carrying out single-point centralized compensation on 10kV circuit is that such expansion joint electrical efficiency is high at the centrostigma place of load; For circuit is long or branch is more, branch's load is larger, and the lower circuit of natural power factor of load can adopt multiple spot compensation, and the location positioning of compensation can be chosen in the concentrated multiple spot of load.According to the distribution situation of load, in order can rationally effectively to compensate circuit, 10kV Zhushan County 012 circuit should adopt multiple spot to carry out dispersion compensation.
Mounting points 1 is selected in a switch front end before backbone bamboo keyed switch temporarily; Mounting points 2 is suspended in 2/3rds places (particular location refer to figure installation site schematic diagram) of backbone bamboo keyed switch to capacity of distribution transform between last switch, the reactive capability of compensation is chosen on the basis of loading at ordinary times and leaves surplus, according to the reactive capability size of compensation, selects compensation way.
Reactive power compensation on 10kV circuit is mainly that the reactive power of the power transformer consumption to distributing in circuit compensates, thereby reduce the idle conveying of upper level transformer station to 10kV circuit, the power factor that improves distribution line, reaches wastage reducing and energy saving effect on the line.
Therefore, the optimum position of carrying out single-point centralized compensation on 10kV circuit is that such expansion joint electrical efficiency is high at the centrostigma place of load; For circuit is long or branch is more, branch's load is larger, and the lower circuit of natural power factor of load can adopt multiple spot compensation, and the location positioning of compensation can be chosen in the concentrated multiple spot of load.According to the distribution situation of load, in order can rationally effectively to compensate circuit, 10kV Zhushan County 012 circuit should adopt multiple spot to carry out dispersion compensation.
Mounting points 1 is selected in a switch front end before backbone bamboo keyed switch temporarily; Mounting points 2 is suspended in 2/3rds places (particular location refer to figure installation site schematic diagram) of backbone bamboo keyed switch to capacity of distribution transform between last switch, the reactive capability of compensation is chosen on the basis of loading at ordinary times and leaves surplus, according to the reactive capability size of compensation, selects compensation way.
1). through statistics, mounting points 1 is to the distribution transforming total capacity 3550kVA after mounting points 2.
The maximum current that the load factor of circuit provides by user calculates:
S ' in formula: the apparent power of circuit reality, kVA;
S: circuit total capacity, kVA;
U: transformer station's outlet voltage, kV;
I: the maximum current of circuit, A;
Active power: P=η × S × cos φ
1
S in formula: mounting points 1 is to the total capacity between mounting points 2, kVA;
Cos φ
1: the power factor before compensation
Before compensation, power factor is with 0.84 calculating, and the power factor after compensation reaches 0.98, needs the reactive capability of compensation to be:
Q
c＝P×(tg(cos
-1φ
1)-tg(cos
-1φ
2))
Cos φ in formula
2, the power factor after compensation
The calculated data adopting in more than calculating is all the calculated value under rated voltage 10kV, for the safe operation of capacitor, now selecting rated voltage is the capacitor of 11kV, according to the relation between capacitor installed capacity and effective compensation capacity (Qc=ω CU2), the reactive capability that can calculate the compensation of mounting points actual needs is 687kVar, actual compensation can be selected 650kVar, and compensation way is: the moving 400kVar that mends of the moving 200kVar+ of benefit of quiet benefit 50kVar+.
2). through statistics, mounting points 2 is to the distribution transforming total capacity 3465kVA after line end.
The maximum current that the load factor of circuit provides by user calculates:
S ' in formula: the apparent power of circuit reality, kVA;
S: circuit total capacity, kVA;
U: transformer station's outlet voltage, kV;
I: the maximum current of circuit, A;
Active power: P=η × S × cos φ
1
S in formula: mounting points 2 is to the total capacity of line end, kVA;
Cos φ
1: the power factor before compensation
Before compensation, power factor is with 0.84 calculating, and the power factor after compensation reaches 0.98, needs the reactive capability of compensation to be:
Q
c＝P×(tg(cos
-1φ
1)-tg(cos
-1φ
2))
Cos φ in formula
2, the power factor after compensation
The calculated data adopting in more than calculating is all the calculated value under rated voltage 10kV, for the safe operation of capacitor, now selecting rated voltage is the capacitor of 11kV, according to the relation between capacitor installed capacity and effective compensation capacity (Qc=ω CU2), the reactive capability that can calculate the compensation of mounting points actual needs is 670kVar, actual compensation can be selected 550kVar, and compensation way is: the moving 300kVar that mends of the moving 200kVar+ of benefit of quiet benefit 50kVar+.
Shown in Fig. 1, two high-voltage capacitors and high-pressure vacuum contactor are housed in control cubicle, by the folding of Single-chip Controlling high-pressure vacuum contactor, complete switching action.Adopt high-tension fuse to provide protection for electric capacity.The line voltage of B, the C of PT sampling high-voltage fence between mutually, except providing voltage signal, also for controller and control loop provide power supply.CT sample line electric current, for controller provides current sampling signal.CT1-CT4 sampling capacitor electric current, overcurrent protection and the open-phase protection of capacitor provide hardware supports.Controller is analyzed the signal of the line voltage collecting, line current, condenser current, calculate, and through judgement, output control signal, controls vacuum contactor and close and cut-off.
Shown in Fig. 2, the utility model is mainly comprised of seven parts such as control unit, vacuum contactor, capacitor, voltage transformer summation current transformer, lightning arrester, outdoor drop-out fuses; Control unit is processed and judges according to the real time data of voltage transformer summation current transformer, the switching of control capacitor.Vacuum contactor receives and carries out the instruction from control unit, completes the switching action of capacitor.Outdoor drop-out fuse carries out short-circuit protection to device, once device has short trouble, fuse switch is tripping at once, prevents device and circuit to cause damage.
Shown in Fig. 3, the utility model adopts single-chip microcomputer as signal acquisition process and controls the core of exporting, by novel intelligent electric meter chip, voltage, electric current are gathered, after single-chip microcomputer calculation process, control the output of two relays to realize the switching of capacitor.Realize the multi-protective functions such as protection in 10 minutes, overcurrent protection, open-phase protection, delay protection, made system works more effectively stable.
In scm software design, structuring and modular method for designing have been adopted.In initialize routine, except to register assignment, the data that also will read in E2PROM judge whether capacitor breaks down before power down last time, as exist fault not control.Single-chip microcomputer sampled data is to read the voltage that calculates, electric current, the valid data such as meritorious chip from measuring.For guaranteeing that capacitor cuts rear abundant electric discharge, designed 10 minutes protection functions, do not control during this time.When programming, stress the protection of capacitor, the defencive function of realization has: under-voltage protection, overvoltage protection, overcurrent protection and open-phase protection, guaranteed the safe operation of installing from software.
Type selecting of the present utility model:
(1) according to concrete circuit choose reasonable mounting points;
(2) according to load character, select suitable reactance Rate;
(such as, while having the nonlinear-loads such as rectification change, intermediate frequency furnace, frequency converter, gate in circuit, device must mate suitable reactance Rate) principle is as follows:
The selection of reactance Rate, should make nth harmonic value on device access place nth harmonic content and capacitor all be no more than the limit value that related standards stipulates.
When only needing to limit inrush phenomenon, should select reactance Rate is 0.1%～1% damping reactor.
For suppressing 5 times and above harmonic wave amplifies, should select reactance Rate is 4.5%～6% reactor; Suppress 3 times and above harmonic wave amplifies, should select reactance Rate is 12%～13% reactor.
(3) rationally determine compensation capacity and progression;
The selection of progression will be determined according to the situation of change of the capacity of capacitor and local load.When no-power vacancy is larger, change when larger, if select the switching mode of single-stage, compensation just seems meticulous not, and switching frequency is few, and utilance is low, and energy-saving effect is bad.At this moment select multistage switching mode just can play better compensation effect; And no-power vacancy is less, change also relatively hour, the switching mode of one pole just can meet the needs of reactive power compensation.
Claims (3)
1. a reactive power compensator for 10kV circuit, it is mainly by control unit, vacuum contactor, capacitor, voltage transformer summation current transformer, lightning arrester, outdoor drop-out fuse composition; It is characterized in that: described control unit comprise one respectively with can gather high-tension electricity netting twine voltage signal voltage transformer, can gather the controller that indoor current transformer that the Outdoor Current Transformer of line current signal and one group gathers condenser current signal is connected, this controller is connected with one group of vacuum contactor respectively by control loop and and then is connected and can completes the capacitor that switching moves.
2. the reactive power compensator of 10kV circuit according to claim 1, is characterized in that: in capacitor switching loop, be serially connected with outdoor drop-out fuse and the lightning arrester that can carry out to device short-circuit protection; B, the C that described voltage transformer is connected to high-voltage fence mutually between, and provide power supply for controller and control loop; Described Outdoor Current Transformer is an outdoor straight-through current transformer, and it is placed on the A phase circuit of high-voltage fence and obtains line current signal.
3. the reactive power compensator of 10kV circuit according to claim 1 and 2, it is characterized in that: described controller be one can carry out signal acquisition process and control output, with the single-chip microcomputer of memory, the control loop that described single-chip microcomputer consists of two relay outputs connects vacuum contactor, also be connected with respectively nixie display, operation keyboard, house dog and serial communication interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320658307.1U CN203562784U (en) | 2013-10-24 | 2013-10-24 | Reactive compensation device of 10kV line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320658307.1U CN203562784U (en) | 2013-10-24 | 2013-10-24 | Reactive compensation device of 10kV line |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595059A (en) * | 2013-10-24 | 2014-02-19 | 国家电网公司 | Reactive compensation device of 10kV line |
| CN105158638A (en) * | 2015-09-02 | 2015-12-16 | 河北省电力建设调整试验所 | Fiber current information transformer device applied to 10-KV distribution network |
| CN108418227A (en) * | 2018-05-18 | 2018-08-17 | 核工业理化工程研究院 | A kind of autocompensation installation and its compensation method based on PLC controls |
| CN111952983A (en) * | 2020-08-13 | 2020-11-17 | 辽宁配网智慧能源有限公司 | Reactive energy supply and demand balance control method for Internet +10KV distribution line |
-
2013
- 2013-10-24 CN CN201320658307.1U patent/CN203562784U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595059A (en) * | 2013-10-24 | 2014-02-19 | 国家电网公司 | Reactive compensation device of 10kV line |
| CN105158638A (en) * | 2015-09-02 | 2015-12-16 | 河北省电力建设调整试验所 | Fiber current information transformer device applied to 10-KV distribution network |
| CN108418227A (en) * | 2018-05-18 | 2018-08-17 | 核工业理化工程研究院 | A kind of autocompensation installation and its compensation method based on PLC controls |
| CN111952983A (en) * | 2020-08-13 | 2020-11-17 | 辽宁配网智慧能源有限公司 | Reactive energy supply and demand balance control method for Internet +10KV distribution line |
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Granted publication date: 20140423 |
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| CX01 | Expiry of patent term |