CN205544259U - Single -phase arc light ground connection analogue means of distribution network - Google Patents
Single -phase arc light ground connection analogue means of distribution network Download PDFInfo
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- CN205544259U CN205544259U CN201620350241.3U CN201620350241U CN205544259U CN 205544259 U CN205544259 U CN 205544259U CN 201620350241 U CN201620350241 U CN 201620350241U CN 205544259 U CN205544259 U CN 205544259U
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- 238000009826 distribution Methods 0.000 title claims abstract description 33
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000007935 neutral effect Effects 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 7
- 238000004088 simulation Methods 0.000 abstract description 6
- 238000010891 electric arc Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model provides a single -phase arc light ground connection analogue means of distribution network, includes that the 380V that comprises three -phase isolation transformer, electric wire netting capacitance to ground, single -phase step up transformer equivalence distribution network and arc light current generator, high -voltage switch, 380V equivalence distribution network bring up to 10kV with 380V power frequency voltage, arc light current generator produces electric arc current under 10kV voltage. Arc light current generator includes current input terminal, fuse, current outgoing terminal, vice side's winding one end ground connection of single -phase step up transformer, and the other end is connected with current input terminal, the one end fixed connection of current input terminal and fuse, the other end of fuse is unsettled to keep the distance about 1~3mm with current outgoing terminal, current outgoing terminal and high -voltage switch are connected back ground connection. The utility model discloses can simulate distribution network arc light earth fault under 380V power condition, the power capacity and the equipment cost of greatly reduced simulation experiment platform have also reduced the safe risk of experiment work.
Description
Technical field
This utility model relates to power system earth fault analogue technique field, and specifically one is joined
Electrical network single-phase arc grounding analog.
Background technology
China's power distribution network is neutral point non-direct grounding system, and power distribution network major failure form is single
Phase ground connection.Wherein, the external factor such as thunder and lightning the arc grounding fault caused accounts for maximum ratio.
Use technical measures can reduce trouble point power frequency continued flow, promote trouble point arc extinction, make arc
Light grounding phenomenon disappears, and electrical network automatically recovers properly functioning, thus is greatly improved power distribution network and powers
Reliability.
Simulation power distribution network arc grounding fault, is the essential condition of research extinguishing arc technical measures.?
Distribution network voltage grade builds test platform, and because voltage is high, corresponding power supply capacity needs hundreds of
KVA, equipment manufacturing cost is high.Additionally, test under high voltage condition, security risk is the most relatively
High.
Utility model content
This utility model provides a kind of power distribution network single-phase arc grounding analog, Ke Yi
380V Power Supplies Condition Imitating power distribution network arc grounding fault, is substantially reduced simulation experiment platform
Power supply capacity and equipment manufacturing cost, also reduce the security risk of experiment work.
A kind of power distribution network single-phase arc grounding analog, including three-phase isolation transformer, electrical network
Direct-to-ground capacitance, single-phase step-up transformer, arc current generator, high-voltage switch gear, three are isolated
Former side's neutral ground of transformator, assistant formula neutral point is unsettled, and assistant formula three-phase windings passes through respectively
Three power-to-ground capacitance ground connection, the most any one phase of three-phase isolation transformer assistant formula three-phase windings
Be connected with one end of the windings of single-phase step-up transformer, the former side of single-phase step-up transformer around
The other end ground connection of group, arc current generator includes current input terminal, electric fuse, electric current
Lead-out terminal, secondary winding one end ground connection of single-phase step-up transformer, the other end and arc current
The current input terminal of generator connects, and current input terminal is fixing with one end of electric fuse to be connected
Connecing, the other end of electric fuse is unsettled, and with current output terminal keep 1～about 3mm away from
Ground connection after, current output terminal is connected with high-voltage switch gear.
Further, also include adjustable with the resistance that arc current generator and high-voltage switch gear concatenate
Water saving resistance.
Further, described resistance adjustable water resistance is made up of electrolyte water and pair of electrodes,
The resistance value of water resistance can be changed by the concentration of regulation electrolyte.
Further, described three-phase isolation transformer input voltage is power frequency 380V, and no-load voltage ratio is
380V/380V, capacity 10kVA；Described single-phase step-up transformer input voltage is power frequency 380V,
No-load voltage ratio is 380V/10kV, capacity 10kVA.
Further, the pressure grade of described high-voltage switch gear is 10kV.
This utility model uses technique scheme, has following beneficial effect and an advantage:
1,380V voltage is brought up to 10kV by this utility model single-phase step-up transformer, then
Utilize from expanding formula electric fuse gap, reach to puncture air insulation, sustained arc electric current can be formed,
Because the electromagnetic relationship between transformer primary side and assistant formula, the current waveform of former side and the arc of assistant formula
Photoelectric current waveform is completely the same.
2, because of the no-load voltage ratio relation of transformator, the fault electricity of tens of amperes can be obtained in 380V side
Flowing, the arc duration depends on the size of electric fuse and the size of electric current.
3, utilize from expanding formula electric fuse gap, can solve to test high-voltage switch when closing a floodgate
Produce the safety problem of electric arc, it is to avoid booster transformer transships, and empirical risk reduces further.
4, use the size of water resistance regulation arc current, relative to high-power resistance, be not required to
Considering its pressure parameter, temperature is the highest only 100 DEG C, and impedance regulation is more convenient, safety
Height, low cost.
5, this method can simulate power distribution network arc grounding fault in laboratory conditions, simulation
Power distribution network builds isolated neutral system, therefore arc grounding fault single-phase with actual power distribution network
There is identical mechanism, greatly reduce power supply capacity and equipment manufacturing cost, also reduce and pressed test
The security risk of work.
Accompanying drawing explanation
Fig. 1 is that the circuit structure of this utility model power distribution network single-phase arc grounding analog shows
It is intended to；
Fig. 2 is the structural representation of arc current generator in this utility model.
In figure: 1 three-phase isolation transformer, 2 power-to-ground capacitances, 3 single-phase step-ups become
Depressor, 4 arc current generators, 5 resistance adjustable water resistance, 6 high-voltage switch gears, 7
Current input terminal, 8 electric fuses, 9 current output terminal.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model, the technical scheme in this utility model is entered
Row clearly and completely describes.
Fig. 1 show the circuit knot of this utility model power distribution network single-phase arc grounding analog
Structure schematic diagram, described power distribution network single-phase arc grounding analog include three-phase isolation transformer 1,
Power-to-ground capacitance 2, single-phase step-up transformer 3, arc current generator 4, resistance is adjustable
Water saving resistance 5 and high-voltage switch gear 6.
Former side's neutral ground of described three-phase isolation transformer 1, assistant formula neutral point is unsettled, secondary
Side's three-phase windings is respectively by three power-to-ground capacitance 2 ground connection, and three-phase isolation transformer 1 is secondary
Side's the most any one phase of three-phase windings connects with one end of the windings of single-phase step-up transformer 3
Connect, the other end ground connection of the windings of single-phase step-up transformer 3, single-phase step-up transformer 3
Secondary winding one end ground connection, the other end is connected with arc current generator 4, and arc current is sent out
Raw device 4 is sequentially connected with rear ground connection with resistance adjustable water resistance 5, high-voltage switch gear 6.
Arc current generator 4 as shown in Figure 2, including current input terminal 7, electric fuse
8, current output terminal 9.Described current input terminal 7 is fixing with one end of electric fuse 8 to be connected
Connecing, the other end of electric fuse 8 is unsettled, and keeps 1～about 3mm with current output terminal 9
Distance, current input terminal 7, electric fuse 8, current output terminal 9 are all fixed on absolutely
On edge support member 10.
Described three-phase isolation transformer 1 input voltage is power frequency 380V, and no-load voltage ratio is
380V/380V, capacity 10kVA, former side's neutral ground, assistant formula isolated neutral.
Described single-phase step-up transformer 3 input voltage is power frequency 380V, and no-load voltage ratio is
380V/10kV, capacity 10kVA.
Described resistance adjustable water resistance 5 is made up of electrolyte water and pair of electrodes, electrode spacing
1～3mm, the resistance value of water resistance is changed by the concentration of regulation electrolyte.
The pressure grade of described high-voltage switch gear 6 is 10kV.
Operation principle of the present utility model:
Being mainly characterized by comprising: under electrical network power-frequency voltage, absolutely of power distribution network single-phase arc grounding fault
Edge sub-surface air insulation electric current sustainable existence breakdown, arc resistance.Owing to the insulation of air is strong
Degree is about 20kV/cm, so being difficult to simulation arc grounding fault under 380V voltage.
This utility model proposed method is by 380V power-frequency voltage by single-phase step-up transformer
Bringing up to 10kV, reach to puncture air insulation, the arc current formed is single-phase with power distribution network
Arc grounding electric current has identical feature.
In technique scheme, the former side of described three-phase isolation transformer 1 and 380V power supply
Connecting, high-voltage switch gear 6 separating brake, whole simulation test device is in holding state.The most single-phase
The assistant formula open circuit of booster transformer, loop current is zero, and former side's equivalent impedance is exciting impedance,
Exciting curent is the least, three-phase isolation transformer 1 assistant formula three-phase circuit symmetrical operation, the most single-phase
Former side's input voltage of booster transformer 3 is phase voltage 380V/ √ 3, and secondary voltage is 10kV/
√3。
Fig. 1 is circuit theory diagrams of the present utility model, mainly include 380V equivalence power distribution network and
Arc current generator two parts.380V equivalence power distribution network circuit structure is isolated transformation by three
Device 1, power-to-ground capacitance 2, single-phase step-up transformer 3 form, and it is tied with actual power distribution network
Structure is identical；Arc current generator produces arc current under 10kV voltage, with power distribution network
Practical situation is consistent.
The high-pressure side circuit of single-phase step-up transformer 3 includes: arc current generator 4, resistance
Adjustable water resistance 5 and high-voltage switch gear 6.When high-voltage switch gear 6 is in gate-dividing state, high voltage
Acting predominantly on the fracture of high-voltage switch gear 6, loop current is zero；After high-voltage switch gear 6 closes a floodgate,
High voltage is mainly applied on arc current generator 4, and the air gap of 1～about 3mm will
Breakdown, form arc current, because the resistance of resistance adjustable water resistance 5 is less, rolled over
Calculating former side, substitutional resistance is close to zero, i.e. single-phase step-up transformer 3 equivalence entry impedance is
Zero, so that 380V equivalence power distribution network is in the running status of single-phase earthing；Along with arc photoelectric
Continuing of stream, near the termination of electric fuse 8, free of air is the fiercest, temperature is the highest, therefore
Shortening will progressively be melted in electric fuse 8 termination, progressively expand from expanding formula clearance distance, until gap
Till air insulation can tolerate 10kV voltage, arc extinction, it is achieved the automatic tune of arc gap
Whole, simulate distribution net work earthing fault phenomenon completely；By change electric fuse 8 material or
The electrolyte concentration of resistance adjustable water resistance 5, can reach regulation and control arc current generator performance
Purpose.
The above, detailed description of the invention the most of the present utility model, but guarantor of the present utility model
The scope of protecting is not limited thereto, and any belongs to those skilled in the art at this utility model
In the technical scope disclosed, the change that can readily occur in or replacement, all should contain in this practicality new
Within the protection domain of type.Therefore, protection domain of the present utility model should be with claim
Protection domain is as the criterion.
Claims (5)
1. a power distribution network single-phase arc grounding analog, it is characterised in that: include three-phase
Isolating transformer (1), power-to-ground capacitance (2), single-phase step-up transformer (3), arc photoelectric
Flow-generator (4), high-voltage switch gear (6), former side's neutral point of three-phase isolation transformer (1)
Ground connection, assistant formula neutral point is unsettled, and assistant formula three-phase windings is respectively by three power-to-ground capacitances (2)
Ground connection, the most any one phase of three-phase isolation transformer (1) assistant formula three-phase windings and single-phase step-up
One end of the windings of transformator (3) connects, the former side of single-phase step-up transformer (3) around
The other end ground connection of group, arc current generator (4) includes current input terminal (7), protects
Danger silk (8), current output terminal (9), the secondary winding one of single-phase step-up transformer (3)
End ground connection, the other end is connected with the current input terminal (7) of arc current generator (4),
Current input terminal (7) is fixing with one end of electric fuse (8) to be connected, electric fuse (8)
The other end is unsettled, and keeps the distance of 1～3mm with current output terminal (9), and electric current is defeated
Go out ground connection after terminal (9) is connected with high-voltage switch gear (6).
2. power distribution network single-phase arc grounding analog as claimed in claim 1, its feature
It is: also include that the resistance concatenated with arc current generator (4) and high-voltage switch gear (6) can
Regulation water resistance (5).
3. power distribution network single-phase arc grounding analog as claimed in claim 2, its feature
It is: described resistance adjustable water resistance (5) is made up of electrolyte water and pair of electrodes, logical
The concentration overregulating electrolyte can change the resistance value of water resistance.
4. power distribution network single-phase arc grounding analog as claimed in claim 1, its feature
Being: described three-phase isolation transformer (1) input voltage is power frequency 380V, no-load voltage ratio is
380V/380V, capacity 10kVA；Described single-phase step-up transformer (3) input voltage is work
Frequently 380V, no-load voltage ratio is 380V/10kV, capacity 10kVA.
5. power distribution network single-phase arc grounding analog as claimed in claim 1, its feature
It is: the pressure grade of described high-voltage switch gear (6) is 10kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620350241.3U CN205544259U (en) | 2016-04-22 | 2016-04-22 | Single -phase arc light ground connection analogue means of distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620350241.3U CN205544259U (en) | 2016-04-22 | 2016-04-22 | Single -phase arc light ground connection analogue means of distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205544259U true CN205544259U (en) | 2016-08-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620350241.3U Withdrawn - After Issue CN205544259U (en) | 2016-04-22 | 2016-04-22 | Single -phase arc light ground connection analogue means of distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205544259U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743075A (en) * | 2016-04-22 | 2016-07-06 | 国家电网公司 | Single-phase arc-grounding simulation device for power distribution network |
| CN108241105A (en) * | 2017-12-08 | 2018-07-03 | 南瑞集团有限公司 | A kind of test method of the arc grounding line selection apparatus based on RTDS |
| CN108695962A (en) * | 2018-06-21 | 2018-10-23 | 河南森源电气股份有限公司 | A kind of DC charging system based on new-energy automobile |
| CN113933641A (en) * | 2021-12-20 | 2022-01-14 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network clearance time-varying arc light grounding fault simulation test method |
-
2016
- 2016-04-22 CN CN201620350241.3U patent/CN205544259U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743075A (en) * | 2016-04-22 | 2016-07-06 | 国家电网公司 | Single-phase arc-grounding simulation device for power distribution network |
| CN108241105A (en) * | 2017-12-08 | 2018-07-03 | 南瑞集团有限公司 | A kind of test method of the arc grounding line selection apparatus based on RTDS |
| CN108695962A (en) * | 2018-06-21 | 2018-10-23 | 河南森源电气股份有限公司 | A kind of DC charging system based on new-energy automobile |
| CN113933641A (en) * | 2021-12-20 | 2022-01-14 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network clearance time-varying arc light grounding fault simulation test method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160831 Effective date of abandoning: 20180227 |