CN202872357U - Optimized comprehensive protection device of power grid - Google Patents
Optimized comprehensive protection device of power grid Download PDFInfo
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- CN202872357U CN202872357U CN 201220527591 CN201220527591U CN202872357U CN 202872357 U CN202872357 U CN 202872357U CN 201220527591 CN201220527591 CN 201220527591 CN 201220527591 U CN201220527591 U CN 201220527591U CN 202872357 U CN202872357 U CN 202872357U
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- overvoltage
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- fuse
- electromagnetic lock
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Abstract
The utility model relates to an optimized comprehensive protection device of a power grid. The device comprises a wall bushing, a microcomputer controller, a PT switching device, a fuse wire fusing indicator light, a voltmeter, a connection/disconnection change-over switch, a voltage change-over switch, an auxiliary switch, a switch electromagnetic lock, a primary simulation plate, a door electromagnetic lock, an inspection window, a small busbar chamber, a secondary chamber, a installing mechanism, a current-limiting fuse protector, an overvoltage suppressor that suppresses overvoltage peaks, a voltage transformer that provides a secondary voltage and an auxiliary voltage signal of a protected system, a high-voltage fuse protector, an isolating switch used for controlling operation and exiting of the system, and an electrified display. The optimized comprehensive protection device of the power grid can optimize overvoltage protection of the system, rapidly eliminate intermittent arc grounding overvoltage, and has the functions of suppressing resonance extinction overvoltage and limiting instant overvoltage at the same time, can eliminate ferromagnetic resonance and suppress ultralow frequency oscillation, greatly enhance the safety and reliability of the system, and is applicable to 3-35kV electric systems.
Description
Technical field
The utility model relates to a kind of operation of power networks protective device, is specifically related to a kind of network optimization comprehensive protector.
Background technology
There is following several overvoltage in China 3-35kV system: when vacuum circuit-breaker, vacuum contactor close, cut-off the inductive loads such as motor and transformer in the pass, easily produce cut-off overvoltage, repeatedly restrike overvoltage and three-phase cut-offs superpotential problem simultaneously; The atmospheric over-voltage that thunderbolt produces; Many inductance, capacity cell are arranged in the electric power system, their combination can consist of the oscillation circuit of a series of different natural frequencies of vibration, therefore, in switching manipulation or when breaking down, some concussion loop in the electric power system just might produce resonance phenomena with additional power source, causes some part (element) in system serious resonance overvoltage to occur; The arc grounding overvoltage of single-phase earthing accident.Because the complexity of system itself there is no the complete project and measures that these overvoltage are limited at present, thereby can occur that cable is blown out, the accident such as motor insulation breakdown, lightning rod are exploded, instrument transformer burns.
The utility model content
Above-mentioned shortcoming and defect for the prior art existence; the utility model provides a kind of network optimization comprehensive protector; but the utility model optimization system overvoltage protection; eliminate fast the intermittent arc grounding overvoltage; have simultaneously the function that suppresses harmonic elimination overvoltage, restriction instantaneous overvoltage, the utility model also is furnished with special PT structure, can eliminate ferro resonance and suppress the ultralow frequency concussion; greatly improve Security of the system and reliability, be applicable in the 3-35kV electric power system.
The utility model is achieved through the following technical solutions:
A kind of network optimization comprehensive protector; comprise: wall bushing 1; microcomputerized controller 2; PT switching device shifter 3; fuse break lamp 4; voltmeter 5; and off-the-line change over switch 6; voltage change-over switch 7; auxiliary switch 8; disconnecting link electromagnetic lock 9; once simulate board 10; door electromagnetic lock 11; observation window 13; little bus-bar room 14; secondary chamber 15; installation mechanism 16; current limiting fuse 17; the excess voltage suppressor 18 of over-voltage suppression spike; the secondary voltage of protected system and the voltage transformer 19 of boost voltage signal are provided; high-tension fuse 20; be used for operation and the isolating switch 21 that withdraws from and the electrification display 22 of control system; the PT broken string is occuring; overvoltage; low-voltage; behind resonance or the arc grounding; the signal that described microcomputerized controller provides according to described voltage transformer; gather judgement by the secondary voltage to described voltage transformer; the various states of analytical system; the failure condition of judgement system; and demonstration fault category; export corresponding switching value contact point signal, be used for reporting to the police.
Preferably, connect voltage relay after one of the angle of release loop of the main PT of described voltage transformer and zero sequence PT compensation windings in series.
The beneficial effects of the utility model are as follows: the dead angle of eliminating the system overvoltage protection; Absorb the system overvoltage of macro-energy; Replace traditional PT cabinet, cost performance is high; The Real-Time Monitoring busbar voltage has charged Presentation Function; Modularized design, compact conformation, high-speed dsp core processor are guaranteed computing real-time and action accuracy, and the real-time monitoring system state is made accurate judgement to the abnormal operating condition that occurs, and is in time exported corresponding switching value contact point signal, is used for reporting to the police; Have fault and recollect function, show nearest 20 historical failure records, have good Electro Magnetic Compatibility, be adapted at using in the complex environment of strong electromagnetic; Two hardware circuits guarantee that running software is reliable; The operation simple and convenient.But the utility model optimization system overvoltage protection; eliminate fast the intermittent arc grounding overvoltage; have simultaneously the function that suppresses harmonic elimination overvoltage, restriction instantaneous overvoltage, greatly improve the safety and reliability of network system, be applicable in the 3-35kV electric power system.
Description of drawings
Fig. 1 is front view of the present utility model;
Fig. 2 is left view of the present utility model;
Fig. 3 is 4PT elementary diagram of the present utility model;
Fig. 4 is a schematic diagram of fixed network optimization comprehensive protector.
Embodiment
Below in conjunction with specific embodiment the utility model is elaborated.Following examples will help those skilled in the art further to understand the utility model, but not limit in any form the utility model.Should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, can also make some distortion and improvement.These all belong to protection range of the present utility model.
Network optimization comprehensive protector as depicted in figs. 1 and 2; comprise: wall bushing 1; microcomputerized controller 2; PT switching device shifter 3; fuse break lamp 4; voltmeter 5; and off-the-line change over switch 6; voltage change-over switch 7; auxiliary switch 8; disconnecting link electromagnetic lock 9; once simulate board 10; door electromagnetic lock 11; famous brand 12; observation window 13; little bus-bar room 14; secondary chamber 15; installation mechanism 16; current limiting fuse 17; the excess voltage suppressor 18 of over-voltage suppression spike; the secondary voltage of protected system and the voltage transformer 19 of boost voltage signal are provided; high-tension fuse 20; be used for the operation of control system and the isolating switch 21 that withdraws from; electrification display 22; brows 23; the PT broken string is occuring; overvoltage; low-voltage; resonance; behind the arc grounding; the signal that described microcomputerized controller provides according to described voltage transformer; utilize DSP at a high speed; the data-handling capacity that repeats realizes Fourier analysis; gather judgement by the secondary voltage to described voltage transformer; timely and accurately the various states of system are analyzed; judge the failure condition of system; and demonstration fault category; export corresponding switching value contact point signal, be used for reporting to the police.
Operation principle of the present utility model is as follows:
The utility model adopts the comprehensive excess voltage suppressor of large capacity; can effectively mild superpotential rising front and scabble due to voltage spikes; and can tolerate the super large energy that overvoltage produces; be complementary with the protective feature of overvoltage protection device and arc extinction cabinet, can eliminate the dead band of system overvoltage protection comprehensively.
The utility model is when normal operation, the voltage signal that the real-time continual detection PT of its Intellectual computer device provides, in case the phenomenons such as PT broken string, overvoltage, low-voltage, resonance, arc grounding occur, the data-handling capacity realization Fourier analysis that the Intellectual computer device utilizes the DSP high speed, repeats, gather, judge by the secondary voltage to voltage transformer pt, timely and accurately the various states of system are analyzed, judge the failure condition of system, and demonstration fault category, export corresponding switching value contact point signal, be used for reporting to the police.Utilize simultaneously the powerful logical operation capability of MCU to realize fast the function of liquid crystal display, telecommunication and data protection.
When resonance appears in system, the Intellectual computer device is realized quick acting according to the different frequency of system resonance, exports corresponding switching value contact, is used for reporting to the police, and realizes fast liquid crystal display.
The utlity model has RS485 or RS232 interface, be furnished with the Modbus communication protocol of standard, realize that with user's Computerized monitor system data telecommunication and data transmit.
The utility model adopts special PT structure, has high saturation point, high impedance, and linear relationship and parameter can be regulated, and has improved tens times than traditional PT reliability.
The utlity model has arc grounding troubleshooting function, being equipped with has ready conditions selects arc light to process and the current limliting adjusting device.
The utlity model has self adaptation and differentiate the control function, utilize current vector, voltage vector and zero-sequence current and idle component to declare ratio, the erroneous judgement of avoiding traditional single voltage sample to cause, and possess fault section differentiation and the processing capacity of having ready conditions; Has multiple auxiliary equipment flexible extension interface function; Possesses the specific collection function, utilize the redundant computation partition method of accepting and believing, calculate, relatively utilize of the phase place, phasor, voltage, electric current, power of 4PT three-phase CT/ zero sequence current mutual inductor, idle, meritorious, harmonic wave, resonance coefficient certificate to process different accidents, and demonstration and record, reach the comprehensively sampling function of electrical network, the 4PT connection principle as shown in Figure 3; Have once differentiation and monitoring function with secondary resonance; Possesses the function that monitoring harmonic content number of times is arranged; Monitoring function with system insulation state.
Anti-resonance potential transformer and the unloaded bus of any length and the capacitor resonance of circuit that the utility model adopts, do not bear to binding hours the single-phase short circuit of electrical network any kind, comprising through the short circuit of interrupted arc, and the voltage that the electrical network electric capacity ferro resonance of power transformer or voltage transformer causes is housed raises.
Anti-resonance potential transformer of the present utility model is optimized improvement with respect to traditional voltage transformer.Be the improvement of the mode of connection on the one hand, connect voltage relay after the angle of release loop that is about to main PT and zero sequence PT one compensates windings in series; Be the parameter designing that zero sequential potential transformer is different from main PT on the other hand, increased D.C. resistance and AC magnetism impedance.The advantage of above-mentioned improvement project is: avoid the angular aperture loop short circuit of main PT, because the capacitor discharge electric current makes the inadequate hidden danger that burns out of angular aperture winding thermal capacity; Measure the residual voltage phenomenon that exceeds standard, suppress in an orderly manner the ultra-low frequency oscillation electric current, eliminate the phenomenon of the frequent fusing of fuse.
A schematic diagram of fixed network optimization comprehensive protector as shown in Figure 4.
The signal that the Intellectual computer device provides according to voltage transformer, in case the phenomenons such as PT broken string, overvoltage, low-voltage, resonance, arc grounding occur, the data-handling capacity realization Fourier analysis that the Intellectual computer device utilizes the DSP high speed, repeats, gather, judge by the secondary voltage to voltage transformer pt, timely and accurately the various states of system are analyzed, judged the failure condition of system, and show fault category, export corresponding switching value contact point signal, be used for reporting to the police.Utilize simultaneously the powerful logical operation capability of MCU to realize fast the functions such as liquid crystal display, telecommunication and data protection.
High voltage isolator is used for putting into operation and withdrawing from of control device, when device needs maintenance or debugging and isolation of system and form obvious cut-off point.
Voltage transformer provides voltage signal for the protection in the system and measuring equipment, and secondary voltage and the boost voltage signal of protected system is provided for device, and special PT mechanism can avoid ferro resonance most possibly.
Large capacity excess voltage suppressor can the over-voltage suppression spike, and it adopts zinc oxide valve plate, compares with conventional inhibitor, greatly reduces the residual voltage value, with low-level in apparatus insulated permission of overvoltage Limiting.
Service condition of the present utility model is as follows:
1, ambient temperature :-30 ℃～+ 60 ℃;
2, atmospheric pressure: 80～110KPa;
3, relative air humidity: 90%(25 ℃), 50%(40 ℃);
4, height above sea level:＜2000m, special circumstances can reach 4000m;
5, the infield should have defence wind, rain, Shahe and dustproof facilities;
6, must not there be the medium of explosion hazard the place to use, must not contain corrosion in the surrounding medium or destroy conducting medium or the gas that insulate, and must not be full of steam in the environment and contain serious mould.
Claims (2)
1. network optimization comprehensive protector; it is characterized in that; comprise: wall bushing; microcomputerized controller; the PT switching device shifter; fuse break lamp; voltmeter; and off-the-line change over switch; voltage change-over switch; auxiliary switch; the disconnecting link electromagnetic lock; once simulate board; the door electromagnetic lock; observation window; little bus-bar room; secondary chamber; installation mechanism; current limiting fuse; the excess voltage suppressor of over-voltage suppression spike; the secondary voltage of protected system and the voltage transformer of boost voltage signal are provided; high-tension fuse; be used for the operation of control system and the isolating switch that withdraws from; electrification display; the PT broken string is occuring; overvoltage; low-voltage; behind resonance or the arc grounding; the signal that described microcomputerized controller provides according to described voltage transformer; gather judgement by the secondary voltage to described voltage transformer; the various states of analytical system; the failure condition of judgement system; and the demonstration fault category, export corresponding switching value contact point signal.
2. network optimization comprehensive protector according to claim 1 is characterized in that, connects voltage relay after the compensation windings in series of the angle of release loop of the main PT of described voltage transformer and zero sequence PT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220527591 CN202872357U (en) | 2012-10-16 | 2012-10-16 | Optimized comprehensive protection device of power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220527591 CN202872357U (en) | 2012-10-16 | 2012-10-16 | Optimized comprehensive protection device of power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202872357U true CN202872357U (en) | 2013-04-10 |
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ID=48039046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220527591 Expired - Fee Related CN202872357U (en) | 2012-10-16 | 2012-10-16 | Optimized comprehensive protection device of power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202872357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317317A (en) * | 2017-07-03 | 2017-11-03 | 安徽恒凯电力保护设备有限公司 | A kind of arc extinguishing device for switch |
-
2012
- 2012-10-16 CN CN 201220527591 patent/CN202872357U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317317A (en) * | 2017-07-03 | 2017-11-03 | 安徽恒凯电力保护设备有限公司 | A kind of arc extinguishing device for switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20141016 |
|
| EXPY | Termination of patent right or utility model |