CN204030580U - A kind of overvoltage inhibiting apparatus with small current line selection - Google Patents
A kind of overvoltage inhibiting apparatus with small current line selection Download PDFInfo
- Publication number
- CN204030580U CN204030580U CN201420440767.1U CN201420440767U CN204030580U CN 204030580 U CN204030580 U CN 204030580U CN 201420440767 U CN201420440767 U CN 201420440767U CN 204030580 U CN204030580 U CN 204030580U
- Authority
- CN
- China
- Prior art keywords
- room
- overvoltage
- inhibiting apparatus
- voltage
- overvoltage inhibiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model relates to a kind of overvoltage inhibiting apparatus with small current line selection, it comprises cabinet, described cabinet inside is divided into control power supply room, mains switch room, cabinet intraoral illumination room, electric-magnetic lock room, microcomputer control loop room and intelligent switch room, and described intelligent switch room comprises overvoltage inhibiting apparatus controller and Small Electric Current Earthing And Routing Device.This device, by changing the single-phase arc grounding of instability into metallicity direct ground connection thus eliminating overvoltage, can also be determined faulty line accurately simultaneously, improve the reliability of mains supply.
Description
Technical field
The utility model relates to the one-phase ground protection technical field of electrical power distribution electric system, particularly a kind of overvoltage inhibiting apparatus with small current line selection.
Background technology
Isolated neutral mode has a series of advantage, is therefore widely used in (3-63kV) in China's medium voltage network.But its one-phase ground protection problem is never solved very well.There is the earth protective device that " absolute definite value " principles such as adopting power-frequency overvoltage, overcurrent and zero sequence power direction is formed at present, but be difficult to the requirement meeting selectivity and reliability.For larger neutral point ungrounded electric network, during circuit generation earth fault, the earthing capacitance current flowing through earth point is enough to start sensitive earth protective device, and the setting value of its sensitivity is difficult to the unsymmetrical current escaping three-phase type TA; For the medium voltage network of the less isolated neutral of scale, during circuit generation earth fault, the earthing capacitance current difference on faulty line and non-fault line is not very large, is difficult to the selectivity being grounded protection.For the medium voltage network of neutral point resonance grounding; after there is single phase ground fault; its earth fault line and non-fault line; be difficult to realize selectivity requirement with current amplitude or zero sequence power direction protection philosophy, usually rely on first half-wave principle and quintuple harmonics principle to realize selectivity requirement.But, facts have proved, based on the protective device that these two kinds of protection philosophies make, all not solve the selective problems of the single phase ground fault in resonant earthed system.
For a long time in China, 3-35KV(is containing 66KV) electrical network mostly adopt the operational mode of isolated neutral, the system of isolated neutral due to investment, economical operation, power supply reliability is high is widely adopted, but when there is single-phase arc grounding, arc grounding over-voltage can be produced, very easily cause the damage of insulation in electric equipment or puncture accidents caused, causing heavy losses.
Along with the expansion of electrical network scale, the extensive use of cable, earthing capacitance current is increasing, when single-phase earthing occurs for it, electric arc can not automatic distinguishing, and arc grounding over-voltage is more and more serious, many electrical networks have employed the mode of resonance grounding, i.e. grounding through arc.The capacitance current of offset current through fault point make it in 0, arc light can not maintain burning and extinguish, the dielectric " air " around fault point is supplemented can return to normal dielectric strength, the insulation of fault point no longer punctures, resonance grounding advantage has very high power supply reliability, but it is high to there is overvoltage multiple, and accurate tuning difficulty is large, route selection accuracy is low, assembly is many, complex structure, and faults itself rate is high, floor space is large, is unfavorable for the shortcomings such as the perspective long-term plan of electrical network.
In view of Problems existing in above-mentioned existing small current ground connection technology, therefore, develop that a kind of route selection accuracy is high, structure is simple, volume is little and the equipment that reliability is high, become the technical problem being badly in need of solving.
Summary of the invention
In view of the foregoing defects the prior art has, the utility model provides a kind of overvoltage inhibiting apparatus with small current line selection, the structure of existing overvoltage inhibiting apparatus is improved, by being added line selection device for low current, the overvoltage because single-phase arc grounding produces and resonance are absorbed, faulty line can also be determined accurately simultaneously, improve the reliability of mains supply.
For reaching above-mentioned purpose, the utility model takes following scheme:
A kind of overvoltage inhibiting apparatus with small current line selection, it comprises cabinet, described cabinet inside is divided into control power supply room, mains switch room, cabinet intraoral illumination room, electric-magnetic lock room, microcomputer control loop room and intelligent switch room, described intelligent switch room comprises overvoltage inhibiting apparatus controller and Small Electric Current Earthing And Routing Device
Described voltage suppression device controller comprises high voltage isolator, high-tension fuse, voltage transformer, resonance eliminator, intelligent switch and a surge absorber;
The upper termination bus of described high voltage isolator, its lower end is connected with the upper end of two high-tension fuses of parallel connection respectively, the other end of a high-tension fuse is connected with one end of surge absorber, the other end ground connection of described surge absorber, the other end of another high-tension fuse is connected with primary side one end of voltage transformer;
The primary side other end of described voltage transformer is connected with the upper end of intelligent switch with a resonance eliminator of parallel connection, the other end ground connection of a resonance eliminator and intelligent switch, the secondary side of described voltage transformer is with auxiliary winding, this auxiliary winding head and the tail series connection forms open-triangular winding, the signal input part of overvoltage inhibiting apparatus controller is connected to after one end tandem high pressure fuse of open-triangular winding and high voltage isolator, the other end ground connection of open-triangular winding is also connected to the signal input part of overvoltage inhibiting apparatus controller simultaneously, the residue three-phase windings of described voltage transformer secondary side is connected to the signal input part of overvoltage inhibiting apparatus controller after tandem high pressure fuse respectively and high voltage isolator,
Described overvoltage inhibiting apparatus controller also comprises three-phase electricity pressure chamber, residual voltage room, arc-extinction device voltage measurement room, communication interface room and installation's power source room, and this overvoltage inhibiting apparatus controller also comprises low pressure warning signal output part, overvoltage alarm signal output, PT broken string alarm signal output, resonance alarm signal output and signal common port.
The utility model has the following advantages and good effect:
1) overvoltage that the single-phase indirect arc ground connection of 3-35kv neutral point ungrounded electric network and resonance cause can effectively be suppressed, accurate route selection when can guarantee branched line single-phase earthing, the mechanism of its extinguishing arc and route selection and the size of electric network capacitance and current have nothing to do, thus not by the impact that change and the electrical network of power system operating mode expand, big and small networks all can use;
2) whole device can form a high-voltage board, structure is simple, volume is little, installment and debugging is convenient, cheap and use safety, can be widely used in the high-voltage Auxiliary system in 3-35kv transformer station and power plant, can use equally in the system that arc suppression coil is housed.
Accompanying drawing explanation
Fig. 1 is the overvoltage inhibiting apparatus structural representation of band small current line selection;
Fig. 2 is the circuit theory diagrams of overvoltage inhibiting apparatus;
Fig. 3 is the circuit theory diagrams of overvoltage inhibiting apparatus controller;
Fig. 4 is the connection circuit schematic diagram of voltage transformer;
Fig. 5 is small current earthing wire-selecting schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, execution mode of the present utility model is described further.
The overvoltage inhibiting apparatus structure of this band small current line selection as shown in Figure 1.This overvoltage inhibiting apparatus comprises cabinet, and described cabinet inside is divided into control power supply room 1, mains switch room 2, cabinet intraoral illumination room 3, electric-magnetic lock room 4, microcomputer control loop room 5 and intelligent switch room 6.Intelligent switch room comprises overvoltage inhibiting apparatus controller WZK and Small Electric Current Earthing And Routing Device.
The circuit theory diagrams of overvoltage inhibiting apparatus as shown in Figure 2.Overvoltage inhibiting apparatus comprises high voltage isolator QS, high-tension fuse FU1 and FU2, voltage transformer pt, resonance eliminator LXQ, intelligent switch PTK and a surge absorber PTB.
The upper termination bus of high voltage isolator QS, its lower end is connected with the upper end of two high-tension fuse FU1 and FU2 of parallel connection respectively, the other end of high-tension fuse FU1 is connected with one end of surge absorber PTB, the other end ground connection of surge absorber PTB, the other end of high-tension fuse FU2 is connected with primary side one end of voltage transformer pt;
The primary side other end of voltage transformer pt is connected with the upper end of intelligent switch PTK with a resonance eliminator LXQ of parallel connection, the other end ground connection of a resonance eliminator LXQ and intelligent switch PTK, the secondary side of voltage transformer pt is with auxiliary winding, this auxiliary winding head and the tail series connection forms open-triangular winding, the signal input part of overvoltage inhibiting apparatus controller is connected to after one end tandem high pressure fuse of open-triangular winding and high voltage isolator, the other end ground connection of open-triangular winding is also connected to the signal input part of overvoltage inhibiting apparatus controller simultaneously, the residue three-phase windings of described voltage transformer secondary side is connected to the signal input part of overvoltage inhibiting apparatus controller after tandem high pressure fuse respectively and high voltage isolator.
Wherein high voltage isolator QS model is GN19-12C/400, and rated voltage is 12KV, and electric current is 400A; High-tension fuse FU1 model is XRNT-12/50, and rated voltage is 12KV, and electric current is 50A; High-voltage and current-limitation fuse FU2 model is XRNP-12/0.5A, and rated voltage is 12KV, and electric current is 0.5A; Voltage transformer pt, model is JDZJ-10, and no-load voltage ratio is 10000: √ 3/100: √ 3/100:3; One time resonance eliminator LXQ model is LXQ-10; Intelligent switch model is PTK; Surge absorber PTB model is PTB-B-12.7/131, and rated voltage is 12.7KV.
The circuit theory diagrams of this overvoltage inhibiting apparatus controller as shown in Figure 3.This overvoltage inhibiting apparatus controller comprises three-phase electricity pressure chamber 11, residual voltage room 12, arc-extinction device voltage measurement room 13, communication interface room 14 and installation's power source room 15, and this overvoltage inhibiting apparatus controller also comprises low pressure warning signal output part 16, overvoltage alarm signal output 7, PT broken string alarm signal output 8, resonance alarm signal output 9 and signal common port 10.
When system is subject to " excitation " impact, " excitation " can reflect at the opening of virtual ground transformer, the energy that harmonic-eliminating resistor consumes " excitation " and system capacitance fast, inductance stores of opening access, stop superpotential formation, stop the insulation of overvoltage impact system, prevent from aging insulation to be subject to superpotential impact puncture and break down, significantly reduce probability of malfunction.During voltage transformer generation resonance; Overvoltage suppressing controller absorbs resonant energy of releasing; resonance overvoltage is eliminated from source; three-phase voltage returns to normal voltage level very soon, not only protects the insulation safety of system, prevents resonance overvoltage to the harm of system insulation; ensure that the characteristic of voltage transformer is in the range of linearity forever simultaneously; in high induction reactance, ensure that resonance can not develop, there is the advantage of small resistor, high resistance ground.
After isolating switch QS closes, this device just enters operating state, is that inspecting state can be safeguarded the components and parts in cabinet and check when QS separating brake.
When system produces Lightning Over-voltage or switching overvoltage, PTB can be absorbed the Lightning Over-voltage in system and switching overvoltage by FU1, can effectively mild overvoltage rising front, suppress, filter until eliminate due to voltage spikes, and overvoltage can be tolerated produce a large amount of energy.Eliminate the large energy that system overvoltage produces, suppress system overvoltage, effectively ensure that the safety of system.FU1 is then protection PTB, and when PTB is in the superpotential process of absorption, the overcurrent of generation can make FU1 fuse, and PTB deactivates, and reaches defencive function to PTB.
When overvoltage inhibiting apparatus normally runs, in cabinet, microcomputerized controller detects the secondary voltage signal that PT provides in real time, once there is the phenomenons such as PT broken string, resonance, metallic ground, arc grounding in system.After WZK detects these phenomenons, just can send the intelligence PTK intelligent switch that closes and eliminate PT bis-resonance.LXQ also can suppress PT resonance once surveying, and successive elimination.
Except above function, this device also has Small Electric Current Earthing And Routing Device accurately, and Small Electric Current Earthing And Routing Device is the zero-sequence current detecting each loop in real time, once when in system, metallic ground or intermittent arc grounding occurring.Small Electric Current Earthing And Routing Device will detect that loop and report to the police, and can detect it is which kind of fault, provides foundation to operation and maintainer.
In this device, voltage suppression device controller and Small Electric Current Earthing And Routing Device all can provide data to backstage, can provide alert data, also can provide the data detected in real time, can not only provide reference, also can provide foundation for accident analysis for maintenance.
Protection range of the present utility model is not limited to the above embodiments, and obviously, those skilled in the art can carry out various change and distortion to the utility model and not depart from scope and spirit of the present utility model.If these are changed and distortion belongs in the scope of the utility model claim and equivalent technologies thereof, then intention of the present utility model also comprises these changes and distortion.
Claims (1)
1. the overvoltage inhibiting apparatus with small current line selection, it comprises cabinet, described cabinet inside is divided into control power supply room, mains switch room, cabinet intraoral illumination room, electric-magnetic lock room, microcomputer control loop room and intelligent switch room, it is characterized in that: described intelligent switch room comprises overvoltage inhibiting apparatus controller and Small Electric Current Earthing And Routing Device
Described voltage suppression device controller comprises high voltage isolator, high-tension fuse, voltage transformer, resonance eliminator, intelligent switch and a surge absorber;
The upper termination bus of described high voltage isolator, its lower end is connected with the upper end of two high-tension fuses of parallel connection respectively, the other end of a high-tension fuse is connected with one end of surge absorber, the other end ground connection of described surge absorber, the other end of another high-tension fuse is connected with primary side one end of voltage transformer;
The primary side other end of described voltage transformer is connected with the upper end of intelligent switch with a resonance eliminator of parallel connection, the other end ground connection of a resonance eliminator and intelligent switch, the secondary side of described voltage transformer is with auxiliary winding, this auxiliary winding head and the tail series connection forms open-triangular winding, the signal input part of overvoltage inhibiting apparatus controller is connected to after one end tandem high pressure fuse of open-triangular winding and high voltage isolator, the other end ground connection of open-triangular winding is also connected to the signal input part of overvoltage inhibiting apparatus controller simultaneously, the residue three-phase windings of described voltage transformer secondary side is connected to the signal input part of overvoltage inhibiting apparatus controller after tandem high pressure fuse respectively and high voltage isolator,
Also comprise three-phase electricity pressure chamber, residual voltage room, arc-extinction device voltage measurement room, communication interface room and installation's power source room in described overvoltage inhibiting apparatus controller, this overvoltage inhibiting apparatus controller also comprises low pressure warning signal output part, overvoltage alarm signal output, PT broken string alarm signal output, resonance alarm signal output and signal common port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420440767.1U CN204030580U (en) | 2014-08-06 | 2014-08-06 | A kind of overvoltage inhibiting apparatus with small current line selection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420440767.1U CN204030580U (en) | 2014-08-06 | 2014-08-06 | A kind of overvoltage inhibiting apparatus with small current line selection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204030580U true CN204030580U (en) | 2014-12-17 |
Family
ID=52070408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420440767.1U Expired - Fee Related CN204030580U (en) | 2014-08-06 | 2014-08-06 | A kind of overvoltage inhibiting apparatus with small current line selection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204030580U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
-
2014
- 2014-08-06 CN CN201420440767.1U patent/CN204030580U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203151088U (en) | Single-phase grounding fault isolation device | |
| CN101719660B (en) | Method for automatically resetting grounding protection device of small-current system | |
| CN103364692A (en) | Single-phase earth fault line selection method of power distribution network earthing system | |
| CN104111412B (en) | The protection attachment structure for preventing variable-frequency power sources cabinet interior element from being impacted by test product flashover | |
| CN202351365U (en) | Small-current grounding alarm equipment and alarm system | |
| CN203180508U (en) | System overvoltage inhibition apparatus | |
| CN204030580U (en) | A kind of overvoltage inhibiting apparatus with small current line selection | |
| CN104917158B (en) | Switch cabinet arc light detects protection system | |
| CN204719174U (en) | A kind of locating device of single-phase grounded malfunction in grounded system of low current | |
| CN204205578U (en) | A kind of efficient high-speed current limiting action device | |
| CN203014377U (en) | Power grid overvoltage inhibition apparatus | |
| CN104953578A (en) | System overvoltage suppression device | |
| CN103777103B (en) | A kind of arc suppression coil state online test method and device | |
| CN108922756A (en) | A kind of dry type hollow shunt reactor observation circuit | |
| CN204030586U (en) | With the arc-extinguishing harmonic-eliminating cabinet of overvoltage inhibiting apparatus | |
| CN202696141U (en) | Arc-extinction resonance-elimination device | |
| CN201774233U (en) | Novel protection device special for low voltage generator | |
| CN201690231U (en) | Nonlinear neutral point ground resistor | |
| CN201562955U (en) | Small-current system grounding protection device with automatic reset function | |
| CN204030587U (en) | With the overvoltage inhibiting apparatus of wireless temperature measurement | |
| CN104158163B (en) | VFTO protection device and method for transformer in GIS substation | |
| CN204030585U (en) | A kind of neutral point virtual ground device | |
| CN204012702U (en) | A kind of arc-extinguishing harmonic-eliminating cabinet with virtual ground device | |
| CN204030584U (en) | A kind of neutral point virtual ground device with wireless temperature measurement | |
| CN104134984A (en) | Neutral point virtual ground connection cabinet |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20200806 |