CN208782469U - A kind of Intelligent arc extinguishing and overvoltage protection - Google Patents
A kind of Intelligent arc extinguishing and overvoltage protection Download PDFInfo
- Publication number
- CN208782469U CN208782469U CN201821644265.5U CN201821644265U CN208782469U CN 208782469 U CN208782469 U CN 208782469U CN 201821644265 U CN201821644265 U CN 201821644265U CN 208782469 U CN208782469 U CN 208782469U
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- voltage
- current
- transformer
- microcomputerized controller
- vacuum contactor
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Abstract
The utility model relates to electric system extinguishing arcs, harmonic elimination technical field, in particular a kind of Intelligent arc extinguishing and overvoltage protection, including disconnecting switch, combination overvoltage protector, voltage transformer, the disconnecting switch is connected on main bus-bar, and three phase mains route is connected out by conducting wire, one end of combination overvoltage protector is connected to three-phase power line road, other end ground connection, it further include current transformer, microcomputerized controller and high-voltage and current-limitation fuse, wherein: described current transformer one end is connected to three-phase power line road, the other end is connected with voltage transformer, the voltage transformer is connect with microcomputerized controller, the current transformer is also connect with microcomputerized controller, the high-voltage and current-limitation fuse is connected with high-pressure vacuum contactor, the microcomputerized controller control connection high-pressure vacuum contactor, the high pressure Vacuum contactor ground connection.The utility model, structure is simple, performance is stable and ensures the power supply reliability of system.
Description
Technical field
The utility model relates to electric system extinguishing arc, harmonic elimination technical field, specially a kind of Intelligent arc extinguishing and overvoltage are protected
Protection unit.
Background technique
Current 3-35KW neutral point indirect earthing, neutral by arc extinction coil grounding or neutral point are through high resistance ground
In electric system, since all kinds of over-voltage protectors are without extinguishing arc, harmonic elimination function, or have a single function, to cannot effectively avoid
Because of the atmospheric over-voltage, single-phase to having a rest property arc grounding over-voltage, ferro-resonance over-voltage etc. caused between system is alternate and phase ground
The generation of accident, these overvoltage constitute certain threat to the service life of power system device and operational safety.
With the expansion of power grid scale, the extensive use of cable, earthing capacitance current is increasing, and single-phase connect is occurring
When ground, electric arc is unable to self-extinguishment, can generate very high overvoltage, has been not suitable with the needs of modern electric development；It is connect in arc suppression coil
In ground, i.e., resonance grounding has very high power supply reliability and safety, but there is overvoltage multiple height, and precision tuning is difficult
Degree is big, and route selection accuracy rate is low, and component is more, and structure is complicated, and device faults itself rate is high, is unfavorable for perspective long-term plan of power grid etc. and lacks
Point；And low resistance grounding exists when single-phase earthing occurs, biggish earth current is to communication line, communication apparatus and two
Secondary line and equipment etc. will generate very big interference.
Utility model content
The purpose of this utility model is to provide a kind of Intelligent arc extinguishing and overvoltage protections, to solve above-mentioned background skill
The problem of being proposed in art.The Intelligent arc extinguishing and overvoltage protection have the spies such as small in size, structure is simple, performance is stable
Point had both eliminated harm of the overvoltage to system, and had in turn ensured the power supply reliability of system, while improving singlephase earth fault choosing
The advantages of accuracy rate of line, the present apparatus has had various ground connection concurrently.
To achieve the above object, the utility model provides the following technical solutions:
A kind of Intelligent arc extinguishing and overvoltage protection, including disconnecting switch, combination overvoltage protector, mutual induction of voltage
Device, the disconnecting switch are connected on main bus-bar, and connect out three phase mains route, the combination overvoltage by conducting wire
One end of protector is connected to three-phase power line road, and other end ground connection, further includes current transformer, microcomputerized controller and high pressure limit
Flow fuse, in which: described current transformer one end is connected to three-phase power line road, and the other end is connected with voltage transformer,
The voltage transformer is connect with microcomputerized controller, and the current transformer is also connect with microcomputerized controller, the high-voltage and current-limitation
Fuse is connected with high-pressure vacuum contactor, the microcomputerized controller control connection high-pressure vacuum contactor, the high pressure vacuum
Contactor ground connection.
It preferably, further include resistive-capacitive overvoltage protector, which is connected to high pressure limit
Between flow fuse and high-pressure vacuum contactor, other end ground connection.
Preferably, the R-C absorption plant that the resistive-capacitive overvoltage protector is made of three-phase resistance capacitance series.
Compared with prior art, the utility model has the beneficial effects that
The current transformer of the present apparatus is that microcomputerized controller SK improves accessible current signal, improves microcomputerized controller
The detection accuracy of SK and preferably identification fault type and trouble location；Resistive-capacitive overvoltage protector ensure that device is eliminated
The success rate of arc fault.
The present apparatus has the characteristics that small in size, structure is simple, performance is stable, has both eliminated harm of the overvoltage to system,
It in turn ensures the power supply reliability of system, while improving the accuracy rate of single-phase earth fault line selection, the present apparatus has had various connect concurrently
The advantages of ground.
Detailed description of the invention
Fig. 1 is the electrical schematic diagram of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, the utility model provides a kind of technical solution:
A kind of Intelligent arc extinguishing and overvoltage protection, including disconnecting switch, combination overvoltage protector, mutual induction of voltage
Device, the disconnecting switch are connected on main bus-bar, and connect out three phase mains route, the combination overvoltage by conducting wire
One end of protector is connected to three-phase power line road, and other end ground connection, further includes current transformer, microcomputerized controller and high pressure limit
Flow fuse, in which: described current transformer one end is connected to three-phase power line road, and the other end is connected with voltage transformer,
High-tension fuse FU is connected between current transformer, voltage transformer, the voltage transformer is connect with microcomputerized controller, institute
It states current transformer also to connect with microcomputerized controller, the high-voltage and current-limitation fuse is connected with high-pressure vacuum contactor, described micro-
Machine controller control connection high-pressure vacuum contactor, the high-pressure vacuum contactor ground connection.
It further include resistive-capacitive overvoltage protector, which is connected to high-voltage and current-limitation fuse
Between high-pressure vacuum contactor, other end ground connection.
The R-C absorption plant that the resistive-capacitive overvoltage protector is made of three-phase resistance capacitance series.
In the utility model:
Disconnecting switch QS uses high voltage isolator, switching when being used to install and safeguard；
Combination overvoltage protector TBP is made of the znr of large capacity, is that the first of the present apparatus protects
Protection element is mainly used to limit atmosphere over-voltage and switching overvoltage；
Current TransmitA、CTb、CTc, for acquiring, (three phase mains route) zero-sequence current of system is changed to microcomputer
For the current signal that controller SK is capable of handling for detection, zero-sequence current (with residual voltage) is that microcomputerized controller SK raising can be handled
Electric current (voltage) signal, improve the detection accuracy of microcomputerized controller SK and preferably identify fault type and failure portion
Position.
Voltage transformer pt, for primary voltage to be converted to microcomputerized controller SK to locate by (the three phase mains route) of system
The secondary voltage (residual voltage) of reason, for detecting and sampling.
Microcomputerized controller SK has measurement, display, operation communication and control function, for determining the performance of ground connection and connecing
Ground is separate, issues switching on and off for corresponding instruction control high-pressure vacuum contactor JA, JB, JC.
High-voltage and current-limitation fuse FUR, the younger generation for whole device protects device, for placing short circuit accident, has and opens
Disconnected feature rapid, Breaking capacity is big.
High-pressure vacuum contactor JA, JB, JC of individual-phase control are exchanged by the big single-phase vacuum of three mutual lockings of operation circuit
Contactor composition, is connected respectively between three-phase main bus-bar and ground, and when normal, in state of cut-offfing, single-phase arc occurs for system
Failure is directly grounded by the light time according to the instruction division of microcomputerized controller SK, to complete the limitation of arc grounding over-voltage.
Resistive-capacitive overvoltage protector ZR, the R-C absorption plant being made of three-phase resistance capacitance series, absorption system occur
High frequency overvoltage.When system generation simple harmonic characteristic arc light, before the movement of extinguishing arc contactor in safe range by over-voltage limitation,
When extinguishing arc contactor separating brake exits, fault restriction mutually restores voltage magnitude and the rate of climb, makes failure will not be because operating vacuum
Contactor causes over-voltage to be restriked, to ensure that device eliminates the success rate of arc fault.
Working principle: disconnecting switch QS closure, system put into operation, when single-phase earthing occurs for system, voltage transformer
The open delta end of PT becomes high potential from low potential immediately, that is, residual voltage occurs, microcomputerized controller SK is to voltage transformer
Three-phase voltage, the residual voltage of PT offer carry out calculation processing, judgement, if it is resonance grounding, then make voltage transformer pt
The instantaneous closure of the switch of open delta side, eliminates ferromagnetic resonance；In case of arc grounding failure, then the height of failure phase is controlled
Pressing vacuum contactor JA, JB, JC closure, (JA, JB, JC are in off-state when normal operation, will not operate normally to system
Have an impact, by microcomputerized controller SK control and be closed, each mutually mutual locking will not act), make system by arc grounding
It is changed into metallic ground, arc extinction；If it is metallic earthing, indication signal occurs for microcomputerized controller SK, waits watch
Member or microcomputer route selection processing.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (3)
1. a kind of Intelligent arc extinguishing and overvoltage protection, it is characterised in that: protected including disconnecting switch, combination overvoltage
Device, voltage transformer, the disconnecting switch are connected on main bus-bar, and connect out three phase mains route by conducting wire, described
One end of combination overvoltage protector is connected to three-phase power line road, and other end ground connection further includes current transformer, microcomputer control
Device and high-voltage and current-limitation fuse, in which: described current transformer one end is connected to three-phase power line road, and the other end is connected with
Voltage transformer, the voltage transformer are connect with microcomputerized controller, and the current transformer is also connect with microcomputerized controller, institute
It states high-voltage and current-limitation fuse and is connected with high-pressure vacuum contactor, the microcomputerized controller control connection high-pressure vacuum contactor, institute
State high-pressure vacuum contactor ground connection.
2. a kind of Intelligent arc extinguishing according to claim 1 and overvoltage protection, it is characterised in that: further include resistance-capacitance type
Over-voltage protector, the resistive-capacitive overvoltage protector one end be connected to high-voltage and current-limitation fuse and high-pressure vacuum contactor it
Between, other end ground connection.
3. a kind of Intelligent arc extinguishing according to claim 2 and overvoltage protection, it is characterised in that: the resistance-capacitance type mistake
The R-C absorption plant that voltage protector is made of three-phase resistance capacitance series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821644265.5U CN208782469U (en) | 2018-10-10 | 2018-10-10 | A kind of Intelligent arc extinguishing and overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821644265.5U CN208782469U (en) | 2018-10-10 | 2018-10-10 | A kind of Intelligent arc extinguishing and overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208782469U true CN208782469U (en) | 2019-04-23 |
Family
ID=66163019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821644265.5U Expired - Fee Related CN208782469U (en) | 2018-10-10 | 2018-10-10 | A kind of Intelligent arc extinguishing and overvoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208782469U (en) |
-
2018
- 2018-10-10 CN CN201821644265.5U patent/CN208782469U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20190423 Termination date: 20211010 |