CN207719814U - A kind of capacitance harmonic protection circuit - Google Patents
A kind of capacitance harmonic protection circuit Download PDFInfo
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- CN207719814U CN207719814U CN201721805074.8U CN201721805074U CN207719814U CN 207719814 U CN207719814 U CN 207719814U CN 201721805074 U CN201721805074 U CN 201721805074U CN 207719814 U CN207719814 U CN 207719814U
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- harmonic
- circuit
- harmonic elimination
- capacitance
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- 230000008030 elimination Effects 0.000 claims abstract description 62
- 238000003379 elimination reaction Methods 0.000 claims abstract description 62
- 238000009826 distribution Methods 0.000 claims abstract description 55
- 238000012545 processing Methods 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 239000010703 silicon Substances 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 210000004899 c-terminal region Anatomy 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 208000025274 Lightning injury Diseases 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- 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
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of capacitance harmonic protection circuits, including sampling circuit, central processing module, compensate circuit and harmonic elimination circuit, sampling circuit is used to acquire the electric current and information of voltage of power distribution network, harmonic elimination circuit includes multiple harmonic elimination element loops, each harmonic elimination element loop includes three harmonic elimination branches, it is sequentially connected in series reactance coil between the head end and tail end of each harmonic elimination branch, harmonic elimination capacitance and silicon-controlled, the harmonic elimination control end of silicon-controlled control connection central processing module, it includes multiple compensating unit circuits to compensate circuit, each compensating unit circuit includes compensating capacitance group and capacitor fling-cut switch, capacitance group is accessed by capacitor fling-cut switch in power distribution network；The utility model can become one harmonic wave control and capacitance compensation this two big function, and compensation capacity is big, and harmonic wave control effect is high; protective capability is strong, and unfailing performance is high, and through-current capacity is big; residual voltage is low, and also have the advantages that quick and precisely, energy-saving safety and overheating protection.
Description
Technical field
The utility model is related to Distribution Network Harmonics protection equipment technical field more particularly to a kind of capacitance harmonic protection electricity
Road.
Background technology
Currently, with the continuous development of the communication technology, a large amount of modern electrical equipment and device are able in power distribution network
Using, but severe harmonic environment is concomitantly also resulted in, the safe normal operation of electric system and equipment is caused
Greatly threaten.
Harmonic wave, actually a kind of interference, injection utility network will make power grid by " pollution ", and higher hamonic wave can also be straight
It connects and harm is generated to electrical equipment, cable and wire is caused to overheat, phase fault and earth fault, zero passage noise, waste system appearance
Amount, power supply system loss increase, and accelerated ageing of insulating, system power factor reduces, and reduces protective effect, makes Medical Devices malfunction
Make etc..In recent years, with the arrival of kownledge economy and information age, electronic computer, accurate Medical Instruments, microprocessor and its
For its digitallijed electronic apparatus using more prevalent, these electrical equipments all have very high requirement to the harmonic quality of power supply, meet
When to higher hamonic wave, it often will appear program run-time error, error in data, timing error, crash, restart or even lead without reason
Permanent damage is caused, massive losses are caused to the work and daily life of people.And when thunder and lightning is interim, since different connect
When ground earth mat cloth lets off close, the ground potential moment for having some earth mat is lifted to very high level, to others ground connection
Very high potential difference is generated between net, which may connect the circuit between different ground levels or the network of equipment formation, i.e.,
Ground potential is struck back, it titanic peril to the security presence of equipment and personnel, needs to install respectively between different earth mats at this time
Grade harmonic current protector avoids the problem that ground potential is struck back.
Utility model content
The purpose of this utility model is to provide a kind of capacitance harmonic protection circuit, can by harmonic wave control and capacitance compensation this
Two big functions become one, and compensation capacity is big, and harmonic wave control effect is high, and protective capability is strong, and unfailing performance is high, and through-current capacity is big,
Residual voltage is low, and also have the advantages that quick and precisely, energy-saving safety and overheating protection.
The technical solution adopted in the utility model is：
A kind of capacitance harmonic protection circuit, including sampling circuit, central processing module, compensation circuit and harmonic elimination circuit, are adopted
The input terminal in sample circuit connects power distribution network, and the output end of sampling circuit connects the sampled signal input of central processing module, in
The controlled end in the compensation control terminal connection compensation circuit of processing module, the harmonic elimination control end connection harmonic elimination of central processing module is entreated to return
The controlled end on road；
The sampling circuit includes current sampling circuit and voltage sample circuit；Current sampling circuit includes Current Mutual Inductance
The three-phase first siding ring of device, current transformer is connected on respectively in power distribution network three-phase power line, the three-phase of current transformer
Second siding ring is separately connected the three-phase current signal input terminal of central processing module；The three-phase input end in voltage sample circuit point
Not Lian Jie power distribution network three-phase low-voltage distribution end, the three-phase output end in voltage sample circuit is separately connected the three of central processing module
Phase voltage input terminal；
The harmonic elimination circuit includes multiple harmonic elimination element loops, and the quantity of harmonic elimination element loop is identical as harmonic elimination number；Often
A harmonic elimination element loop includes three harmonic elimination branches, and the head end of three harmonic elimination branches is respectively connected in the three-phase firewire of power distribution network,
The tail end of three harmonic elimination branches is grounded after being connected；Be sequentially connected in series between the head end and tail end of each harmonic elimination branch reactance coil,
Harmonic elimination capacitance and silicon-controlled, the pole plate of silicon-controlled anode connection harmonic elimination capacitance, silicon-controlled minus earth, silicon-controlled control
Connect the harmonic elimination control end of central processing module.
The compensation circuit includes multiple compensating unit circuits, and each compensating unit circuit includes compensating capacitance group and electricity
Hold fling-cut switch, capacitance group is accessed by capacitor fling-cut switch in power distribution network.
The capacitor that the compensating capacitance group is connected by three triangles is constituted, three terminals difference of compensating capacitance group
It accesses in the three-phase firewire of power distribution network.
The capacitor fling-cut switch uses silicon-controlled, on-load switch or relay.
The capacitor fling-cut switch controls the compensation of the coil connection central processing module of relay using control relay
Control terminal controls the first normally opened contact string of relay if three terminals of compensating capacitance group are respectively the ends A, the ends B and C-terminal
It is associated between the ends A and the A phase power firestreaks of power distribution network, the second normally opened contact for controlling relay is connected on the B of the ends B and power distribution network
Between phase power firestreak, the third normally opened contact for controlling relay is connected between C-terminal and the C phase power firestreaks of power distribution network.
It is also in series with electrothermal relay between the compensating capacitance group and power distribution network.
It is in series with fuse in the voltage sample circuit and compensation circuit.
The utility model has the advantages that：
（1）Using integrating the harmonic protection circuit of harmonic wave control and capacitance compensation, while realizing Harmonics elimination and nothing
Work(compensates two big functions, and integrated level is high, and compensation capacity is big, reduces the power loss of power supply, improves power factor, harmonic wave control
Effect is high, and protective capability is strong, and unfailing performance is high, and through-current capacity is big, and residual voltage is low；
（2）Using setting compensating capacitance group and capacitor fling-cut switch in compensating circuit, no-flashy-flow when realizing switching capacitance,
It is noiseless without overvoltage, frequent movement, and fast response time can be born, and branch can be needed to compensate or be grouped compensation according to circuit,
To achieve the purpose that precise guidance；
（3）By compensating the setting of electrothermal relay and fuse in circuit, the overheating protection and mistake in compensation circuit are realized
Stream protection, further protects compensating capacitance group, further increases the reliable and stable operation of the utility model.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Specific implementation mode
As shown in Figure 1, the utility model includes sampling circuit, central processing module, compensation circuit and harmonic elimination circuit, sampling
The input terminal in circuit connects power distribution network, the sampled signal input of the output end connection central processing module of sampling circuit, center
The controlled end in the compensation control terminal connection compensation circuit of processing module, the harmonic elimination control end connection harmonic elimination circuit of central processing module
Controlled end；
Sampling circuit includes current sampling circuit and voltage sample circuit；Current sampling circuit includes current transformer, electricity
The three-phase first siding ring of current transformer is connected on respectively in power distribution network three-phase power line, the three-phase secondary side of current transformer
Coil is separately connected the three-phase current signal input terminal of central processing module；The three-phase input end in voltage sample circuit is separately connected
The three-phase output end of the three-phase low-voltage distribution end of power distribution network, voltage sample circuit is separately connected the three-phase voltage of central processing module
Input terminal；
Harmonic elimination circuit includes multiple harmonic elimination element loops, and the quantity of harmonic elimination element loop is identical as harmonic elimination number；Each disappear
Humorous element loop includes three harmonic elimination branches, and the head end of three harmonic elimination branches is respectively connected in the three-phase firewire of power distribution network, three
The tail end of harmonic elimination branch is grounded after being connected；It is sequentially connected in series reactance coil L, harmonic elimination between the head end and tail end of each harmonic elimination branch
Capacitance C and silicon-controlled, the pole plate of silicon-controlled anode connection harmonic elimination capacitance, silicon-controlled minus earth, silicon-controlled control connect
Connect the harmonic elimination control end of central processing module；
Compensation circuit includes multiple compensating unit circuits, and each compensating unit circuit includes that compensating capacitance group and capacitance are thrown
It cuts and closes, capacitance group is accessed by capacitor fling-cut switch in power distribution network；Capacitor fling-cut switch using silicon-controlled, on-load switch or after
Electric appliance.
The utility model in order to better understand below in conjunction with the accompanying drawings makees furtherly the technical solution of the utility model
It is bright.
The watt level that the quantity in compensating unit circuit compensates as needed is selected, the quantity root of harmonic elimination element loop
Need the number of harmonic elimination to be selected according to needing to carry out harmonic elimination circuit, this sentence compensation circuit tool there are two compensating unit circuit,
Harmonic elimination circuit illustrated for harmonic elimination circuit.
As shown in Figure 1, central processing module use PLC, capacitor fling-cut switch using control relay, compensating capacitance group by
Three capacitors are constituted according to triangle connection type, if three terminals of compensating capacitance group are respectively the ends A, the ends B and C-terminal,
The compensation control terminal of the coil T connections PLC of relay is controlled, the first normally opened contact KT1 for controlling relay is connected on the ends A and matches
Between the A phase power firestreaks L1 of power grid, the second normally opened contact KT2 for controlling relay is connected on the B phase power supplys of the ends B and power distribution network
Between firewire L2, the third normally opened contact KT3 for controlling relay is connected between C-terminal and the C phase power firestreaks L3 of power distribution network.
The utility model is mainly used for the different voltages supply lines such as computer system, modem, signal control
Front equipment end crosses harmonic current and is protected and carried out idle benefit caused by the lightning stroke or Overcurrent to direct current supply line
It repays.
Current sampling circuit is used to acquire the current information of distribution network source, including current transformer, current transformer
Three-phase first siding ring is connected on respectively in power distribution network three-phase power line, A phase second siding ring TAa, B phases of current transformer
Second siding ring TAb and C phase second siding ring TAc is separately connected the A phase current signals input terminal of central processing module, B phase electricity
Flow signal input part and C phase current signal input terminals；
Information of voltage of the voltage sample circuit for just adding power distribution, including A phase voltages branch, B phase voltages branch and C
Phase voltage branch；
The A phase low-voltage distributions end of one end connection power distribution network of A phase voltage branches, the other end of A phase voltage branches connect PLC
A phase voltage signal input terminals, and A phase fuses FUa is in series in A phase voltage branches；
The B phase low-voltage distributions end of one end connection power distribution network of B phase voltage branches, the other end of B phase voltage branches connect PLC
B phase voltage signal input terminals, and B phase fuses FUb is in series in B phase voltage branches；
The C phase low-voltage distributions end of one end connection power distribution network of C phase voltage branches, the other end of C phase voltage branches connect PLC
C phase voltage signal input terminals, and C phase fuses FUc is in series in C phase voltage branches.
Sampling circuit is acquired and is sent to PLC processor, PLC in real time to the power supply signal and current signal of power distribution network
Processor selectes the power and number of reactive-load compensation according to real-time current and voltage, and controls control relay coil T and be powered, into
And make the first normally opened contact KT1, the second normally opened contact KT2 and the third normally opened contact of the control relay in compensating unit circuit
KT3 is closed, and is realized the switching of capacitance, is realized the reactive power compensation of power distribution network.
When needing to carry out harmonic elimination processing to power distribution network, PLC controls silicon-controlled control pole G and is powered, controlled silicon conducting.When
Electric clearance is formed between two electrode plates of harmonic elimination capacitance C used in harmonic elimination element loop, power distribution network is no more than ignition voltage
The case where be in high-impedance state when running, between two electrode plates, if power grid makes two electrode plates because of lightning stroke or Overcurrent
Between harmonic wave be more than igniting normal current value when, electric clearance is breakdown, is discharged current energy by arc discharge, impact
After wave, electric arc by be divided into muffler and lead arcs composition lead arc system earth, realize the Harmonics elimination of power distribution network.
The utility model integrates reactive-load compensation and Harmonics elimination function, by acquiring distribution line electric current, electricity in real time
It presses, have the parameters such as inactivity, harmonic wave, controlled by PLC processor, eliminate line harmonic in time, keep circuit pure, ensure and supply
Electric safety, and the reactive power of circuit is compensated, electric energy is saved, has ensured that the high efficiency of electric power uses, and handle quick
Accurately；Secondly, harmonic wave control and the public control device of no-power compensation function and acquisition information, integrated level is high, and circuit is simple,
Reliability is high；Again, harmonic elimination current injection of circuits amount used in the utility model is big, and residual voltage is low, built-in high-performance gas discharge pipe, safety
Performance is high, is connected with connecting terminal using modularized design, and wiring is reliably, conveniently；Again, the utility model is used compensates circuit
It is formed using high-quality dry-type capacitance and trigger device, carries out capacitor switching automatically, no-flashy-flow when switching capacitance, no overvoltage, without making an uproar
Sound can bear frequent movement, and be put into when voltage zero-cross, and when current over-zero cuts off, fast response time.
Meanwhile the excessively high high current damage caused in compensating capacitance group or power distribution network of temperature of compensating capacitance group in order to prevent
Compensating capacitance group, is also in series with electrothermal relay between compensating capacitance group and distribution, and electrothermal relay is used with three interfaces
Electrothermal relay FR；In addition, damage of the high current to compensating capacitance group in order to prevent, at the ends A of compensating capacitance group and power distribution network A phases
Serial fuse FU1 between power firestreak L1 connects molten between the ends B of compensating capacitance group and power distribution network B phase power firestreaks L2
Disconnected device FU2, the serial fuse FU3 between the C-terminal and power distribution network C phase power firestreaks L3 of compensating capacitance group.
When high current passes through power distribution network, A phase fuse FU1, B phase fuse FU2 and C phase fuses FU3 is disconnected, compensation
Circuit disconnects, and prevents compensating capacitance group from being damaged by high current；When compensating capacitance group when the temperature is excessively high, electrothermal relay FR is disconnected, and is mended
Circuit disconnection is repaid, high temperature allowance for damage capacitance group is prevented, further improves the safety of the utility model, intelligent and high-efficiency, peace
It is complete reliable.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that,
It can still modify to the technical solution recorded in previous embodiment, either to which part or all technical features
Progress equivalent replacement, and these modifications or replacements, the utility model embodiment that it does not separate the essence of the corresponding technical solution
The range of technical solution.
Claims (7)
1. a kind of capacitance harmonic protection circuit, it is characterised in that：Including sampling circuit, central processing module, compensation circuit and disappear
The input terminal in humorous circuit, sampling circuit connects power distribution network, the sampled signal of the output end connection central processing module of sampling circuit
Input terminal, the controlled end in the compensation control terminal connection compensation circuit of central processing module, the harmonic elimination control end of central processing module
Connect the controlled end in harmonic elimination circuit；
The sampling circuit includes current sampling circuit and voltage sample circuit；Current sampling circuit includes current transformer, electricity
The three-phase first siding ring of current transformer is connected on respectively in power distribution network three-phase power line, the three-phase secondary side of current transformer
Coil is separately connected the three-phase current signal input terminal of central processing module；The three-phase input end in voltage sample circuit is separately connected
The three-phase output end of the three-phase low-voltage distribution end of power distribution network, voltage sample circuit is separately connected the three-phase voltage of central processing module
Input terminal；
The harmonic elimination circuit includes multiple harmonic elimination element loops, and the quantity of harmonic elimination element loop is identical as harmonic elimination number；Each disappear
Humorous element loop includes three harmonic elimination branches, and the head end of three harmonic elimination branches is respectively connected in the three-phase firewire of power distribution network, three
The tail end of harmonic elimination branch is grounded after being connected；It is sequentially connected in series reactance coil, harmonic elimination between the head end and tail end of each harmonic elimination branch
Capacitance and silicon-controlled, the pole plate of silicon-controlled anode connection harmonic elimination capacitance, silicon-controlled minus earth, silicon-controlled control connection
The harmonic elimination control end of central processing module.
2. capacitance harmonic protection circuit according to claim 1, it is characterised in that：The compensation circuit includes multiple compensation
Element loop, each compensating unit circuit include compensating capacitance group and capacitor fling-cut switch, and capacitance group is opened by capacitor switching
It closes in access power distribution network.
3. capacitance harmonic protection circuit according to claim 2, it is characterised in that：The compensating capacitance group is by three triangles
The capacitor of shape connection is constituted, and three terminals of compensating capacitance group are respectively connected in the three-phase firewire of power distribution network.
4. capacitance harmonic protection circuit according to claim 2 or 3, it is characterised in that：The capacitor fling-cut switch uses
Silicon-controlled, on-load switch or relay.
5. capacitance harmonic protection circuit according to claim 4, it is characterised in that：The capacitor fling-cut switch is using control
Relay controls the compensation control terminal of the coil connection central processing module of relay, if three terminals of compensating capacitance group
The respectively ends A, the ends B and C-terminal, control relay the first normally opened contact be connected on the ends A and power distribution network A phases power firestreak it
Between, the second normally opened contact for controlling relay is connected between the ends B and the B phase power firestreaks of power distribution network, controls the of relay
Three normally opened contacts are connected between C-terminal and the C phase power firestreaks of power distribution network.
6. capacitance harmonic protection circuit according to claim 2, it is characterised in that：The compensating capacitance group and power distribution network it
Between be also in series with electrothermal relay.
7. capacitance harmonic protection circuit according to claim 1, it is characterised in that：It the voltage sample circuit and compensates back
Lu Zhongjun is in series with fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721805074.8U CN207719814U (en) | 2017-12-21 | 2017-12-21 | A kind of capacitance harmonic protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721805074.8U CN207719814U (en) | 2017-12-21 | 2017-12-21 | A kind of capacitance harmonic protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207719814U true CN207719814U (en) | 2018-08-10 |
Family
ID=63056998
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721805074.8U Expired - Fee Related CN207719814U (en) | 2017-12-21 | 2017-12-21 | A kind of capacitance harmonic protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN207719814U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066584A (en) * | 2018-08-13 | 2018-12-21 | 国网浙江省电力有限公司绍兴供电公司 | A kind of capacitor harmonic protection method of high protection act precision |
-
2017
- 2017-12-21 CN CN201721805074.8U patent/CN207719814U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066584A (en) * | 2018-08-13 | 2018-12-21 | 国网浙江省电力有限公司绍兴供电公司 | A kind of capacitor harmonic protection method of high protection act precision |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180810 |