CN208489651U - A kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system - Google Patents
A kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system Download PDFInfo
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- CN208489651U CN208489651U CN201820498451.6U CN201820498451U CN208489651U CN 208489651 U CN208489651 U CN 208489651U CN 201820498451 U CN201820498451 U CN 201820498451U CN 208489651 U CN208489651 U CN 208489651U
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Abstract
The utility model discloses a kind of singlephase earth fault arc-extinguishing systems of small current neutral grounding system, including line-selected earthing device, step-up transformer and voltage source；The output end of input terminal inlet highway three-phase voltage, residual voltage and each branch zero-sequence current of line-selected earthing device, line-selected earthing device issues control signal to voltage source；Voltage source receives control signal and exports specific voltage vector, the low-pressure side of the output end connection step-up transformer of voltage source；The neutral point of high-pressure side one end connection small current neutral grounding system of step-up transformer, the high-pressure side other end ground connection of step-up transformer.The utility model is consistent by faulted phase voltage and ground, ground fault extinguishing arc can quickly be made, cable is avoided at ground connection to be burnt and person electric shock casualty accident by arc light, system after making generation singlephase earth fault may not necessarily trip immediately and continue safe operation a period of time, greatly improve the reliability and safety of system.
Description
Technical field
The utility model relates to a kind of singlephase earth fault arc-extinguishing systems of small current neutral grounding system, belong to electric system
Relay protection field.
Background technique
In 3kV-66kV small current neutral grounding system, single-phase earthing is relatively conventional fault type.Small current neutral grounding system
When single-phase earthing occurs for system, failure phase-to-ground voltage is reduced, and non-faulting phase-to-ground voltage increases, and line voltage is still symmetrical, this shape
Under state, because of earth current very little, in order to guarantee power supply reliability, operation 1-2h is allowed.But due to non-faulting phase arc light mistake
Voltage easily causes the breakdown of insulation vulnerable area, iron core of voltage transformer saturation, system overvoltage and failure phase arc light to burn
Cable easily causes the problems such as person electric shock casualty accident, therefore needs timely the single-phase of isolated fault phase to connect after single-phase earthing
Earth fault, safeguards system safe and stable operation and power supply reliability.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of singlephase earth fault of small current neutral grounding system
Arc-extinguishing system.
In order to achieve the above object, the technical scheme adopted by the utility model is
A kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system, including line-selected earthing device, step-up transformer
And voltage source；Input terminal inlet highway three-phase voltage, residual voltage and each branch zero-sequence current of line-selected earthing device, ground connection
The output end of line selection apparatus issues control signal to voltage source；Voltage source receives control signal and exports specific voltage vector, electricity
The low-pressure side of the output end connection step-up transformer of potential source；High-pressure side one end connection small current neutral grounding system of step-up transformer
Neutral point, the high-pressure side other end ground connection of step-up transformer.
The input terminal of line-selected earthing device connects bus-bar potential transformer, and bus-bar potential transformer acquires bus three-phase voltage
And residual voltage.
The input terminal of line-selected earthing device connects the zero sequence current mutual inductor of each branch road, and zero sequence current mutual inductor acquires institute
In the zero-sequence current of branch.
The high-pressure side both ends of step-up transformer also and are connected to arc suppression coil.
Between line-selected earthing device and voltage source by it is limited/wirelessly communicate.
High-pressure side one end of step-up transformer connects the neutral point of small current neutral grounding system by switch, step-up transformer
The high-pressure side other end passes through switch ground connection.
The utility model is achieved the utility model has the advantages that the utility model, which uses, artificially raises neutrality in neutral point injecting voltage
The thinking of point current potential, faulted phase voltage and ground is consistent, it can quickly make ground fault extinguishing arc, cable at ground connection is avoided to be burnt by arc light
It ruins and person electric shock casualty accident, the system after making generation singlephase earth fault may not necessarily trip immediately and continue safe fortune
Row a period of time, greatly improve the reliability and safety of system.
Detailed description of the invention
Fig. 1 is the wiring schematic diagram of Tthe utility model system；
Fig. 2 compensates the vector schematic diagram of voltage to neutral point when being ground connection；
Fig. 3 is extinguishing arc flow chart.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
As shown in Figure 1, a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system, including line-selected earthing device,
Step-up transformer and voltage source.
The input terminal of line-selected earthing device is separately connected the zero sequence electricity of bus-bar potential transformer and the road Ge Zhi by cable
Current transformer, bus-bar potential transformer acquire bus three-phase voltage and residual voltage, branch where zero sequence current mutual inductor acquisition
Zero-sequence current, line-selected earthing device judges whether there is ground fault according to residual voltage, and line-selected earthing device is according to each
Road zero-sequence current selects faulty line, and line-selected earthing device selects failure phase, line-selected earthing device root according to bus three-phase voltage
Mutually calculated according to failure the voltage vector that need to inject small current neutral grounding system neutral point and by it is limited/wirelessly to voltage
Source issues control signal, includes the voltage vector that voltage source needs to export in the control signal of sending, what voltage source needed to export
Voltage vector according to step-up transformer turn ratio and need to inject small current neutral grounding system neutral point voltage vector calculate obtain.
Voltage source is not limited to synchronous generator, power electronic equipment, and voltage source receives control signal and exports specific voltage
Vector, the low-pressure side of the output end connection step-up transformer of voltage source.
High-pressure side one end of step-up transformer connects the neutral point of small current neutral grounding system by switch, step-up transformer
For the high-pressure side other end by switch ground connection, the high-pressure side both ends of step-up transformer also and are connected to arc suppression coil, i.e., arc suppression coil with
The arc-extinguishing system parallel running reduces the demand to voltage source capacity.
As shown in Figures 2 and 3, the arc extinguishing method of above system, comprising the following steps:
1) line-selected earthing device real-time reception residual voltage, judges whether there is ground fault.
If 2) break down, line-selected earthing device selects faulty line according to each branch zero-sequence current, according to bus three-phase
Voltage selects failure phase, calculates the voltage vector that need to inject small current neutral grounding system neutral point and issues control letter to voltage source
Number.
3) voltage source exports specific voltage vector according to control signal, makes the high-pressure side output and failure of step-up transformer
Contrary voltage vector mutually in the same size makes failure phase-to-ground voltage close to 0, and arc light extinguishes.
Above system is using artificially the thinking of neutral point potential is raised in neutral point injecting voltage, by faulted phase voltage and ground
Unanimously, it can quickly make ground fault extinguishing arc, avoid at ground connection cable from being burnt and person electric shock casualty accident by arc light, make to occur
System after singlephase earth fault may not necessarily trip immediately and continue safe operation a period of time, greatly improve the reliable of system
Property and safety.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
It also should be regarded as the protection scope of the utility model into deformation.
Claims (6)
1. a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system, it is characterised in that: including line-selected earthing device, rise
Pressure transformer and voltage source；Input terminal inlet highway three-phase voltage, residual voltage and each branch zero sequence of line-selected earthing device
The output end of electric current, line-selected earthing device issues control signal to voltage source；Voltage source receives the specific electricity of control signal output
The amount of pressing to, the low-pressure side of the output end connection step-up transformer of voltage source；High-pressure side one end of step-up transformer connects low current
The neutral point of earthed system, the high-pressure side other end ground connection of step-up transformer.
2. a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system according to claim 1, it is characterised in that:
The input terminal of line-selected earthing device connects bus-bar potential transformer, and bus-bar potential transformer acquires bus three-phase voltage and zero sequence electricity
Pressure.
3. a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system according to claim 1, it is characterised in that:
The input terminal of line-selected earthing device connects the zero sequence current mutual inductor of each branch road, branch where zero sequence current mutual inductor acquisition
Zero-sequence current.
4. a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system according to claim 1, it is characterised in that:
The high-pressure side both ends of step-up transformer also and are connected to arc suppression coil.
5. a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system according to claim 1, it is characterised in that:
Between line-selected earthing device and voltage source by it is limited/wirelessly communicate.
6. a kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system according to claim 1, it is characterised in that:
High-pressure side one end of step-up transformer connects the neutral point of small current neutral grounding system by switch, and the high-pressure side of step-up transformer is another
One end passes through switch ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820498451.6U CN208489651U (en) | 2018-04-10 | 2018-04-10 | A kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820498451.6U CN208489651U (en) | 2018-04-10 | 2018-04-10 | A kind of singlephase earth fault arc-extinguishing system of small current neutral grounding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258674A (en) * | 2018-04-10 | 2018-07-06 | 南京南瑞继保电气有限公司 | The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system |
| CN111398732A (en) * | 2020-03-14 | 2020-07-10 | 华中科技大学 | Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof |
-
2018
- 2018-04-10 CN CN201820498451.6U patent/CN208489651U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258674A (en) * | 2018-04-10 | 2018-07-06 | 南京南瑞继保电气有限公司 | The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system |
| CN111398732A (en) * | 2020-03-14 | 2020-07-10 | 华中科技大学 | Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof |
| CN111398732B (en) * | 2020-03-14 | 2020-12-29 | 华中科技大学 | Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof |
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