CN107681646A - It is a kind of to be used for guard method of the arc suppression coil under chopping current - Google Patents
It is a kind of to be used for guard method of the arc suppression coil under chopping current Download PDFInfo
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- CN107681646A CN107681646A CN201711024771.4A CN201711024771A CN107681646A CN 107681646 A CN107681646 A CN 107681646A CN 201711024771 A CN201711024771 A CN 201711024771A CN 107681646 A CN107681646 A CN 107681646A
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- arc suppression
- suppression coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
It is used for guard method of the arc suppression coil under chopping current the invention discloses a kind of, comprises the following steps：S1, at the both ends of arc suppression coil it is arranged in parallel Zinc-Oxide Arrester；The equivalent tuning coil L of the lightning-arrest substitutional resistance R of S2, the zinc oxide and arc suppression coil forms a resistance sense shunt circuit；The insulation against ground under normal operating conditions of S3, Zinc-Oxide Arrester, and the characteristic of conducting is presented under high-voltage state, continuous current circuit of the arc suppression coil under overvoltage is served as, makes arc suppression coil can safe and stable operation under any power frequency chopping current.The present invention by equivalent the tuning coil L and Zinc-Oxide Arrester of arc suppression coil substitutional resistance R by forming a resistance sense shunt circuit, characteristic using Zinc-Oxide Arrester is insulation against ground under normal operating condition, and the characteristic of conducting is presented under high-voltage state, continuous current circuit of the arc suppression coil under overvoltage is served as, makes arc suppression coil can safe and stable operation under any power frequency chopping current.
Description
Technical field
The present invention relates to power safety technique field, and in particular to a kind of in 35kV and 10kV power distribution networks to be used for arc suppression coil
Guard method under chopping current.
Background technology
Power distribution network is the network that electric energy is directly distributed to user in power system, and the running status of power distribution network directly influences
Power supply reliability in power system.In China's power system, power distribution network refers to 35kV and the distribution line of following voltage class,
To improve the power supply reliability of power distribution network, the method for operation of neutral by arc extinction coil grounding is generally used in power distribution network.Cause
Arc suppression coil is inductive element, and when singlephase earth fault occurs for power distribution network, inductive current can be provided into faulty line, with
The capacitance current of fault point is compensated, so that the aftercurrent of fault point can be controlled in below 10A, reaches extinguishing electric arc
Purpose, therefore also referred to as the system be compensation of ground system, can operate with failure 2 hours, substantially increase the confession of power distribution network
Electric reliability.
The disadvantage of compensation of ground system is failure can not to be differentiated and be handled, and many selection methods such as five times are humorous
Ripple method, S ripples injection method, it can all be failed in compensation of ground system than width phase comparing method.Trace it to its cause is arc suppression coil in power distribution network
Inductance current is filled with malfunction into system, makes the fault parameter in circuit there occurs the change of essence, and extinguishing arc
Coil is inductive element, and the electric current flowed through under distribution network failure state in arc suppression coil is larger, now cuts off arc suppression coil branch
Road, namely it is dammed can produce very high overvoltage, the energy stored in arc suppression coil can because of no leakage path
Internal short-circuit can be caused in a short time by coil scaling loss.
The content of the invention
Problem to be solved by this invention, which is to provide, a kind of is used for guard method of the arc suppression coil under chopping current.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
It is a kind of to be used for guard method of the arc suppression coil under chopping current, comprise the following steps：
S1, at the both ends of arc suppression coil it is arranged in parallel Zinc-Oxide Arrester；
The equivalent tuning coil L of the lightning-arrest substitutional resistance R of S2, the zinc oxide and arc suppression coil forms a resistance inductive parallel and returned
Road；
The insulation against ground under normal operating conditions of S3, Zinc-Oxide Arrester, and the characteristic of conducting is presented under high-voltage state, fill
When continuous current circuit of the arc suppression coil under overvoltage, make arc suppression coil can safety and stability fortune under any power frequency chopping current
OK.
Further, the guard method is in 35kV in power system and the power distribution network of following voltage class, being connected to
On the neutral point of ground transformer, perceptual path is connected to form with grounding net of transformer substation, single-phase earthing is occurring for power distribution network
Inductance current is provided during failure to compensate the device of the capacitance current of trouble point.
First to the 50HZ power currents flowed through in normal arc suppression coil under compensation of ground system in power distribution network and absorption
The energy response of release is analyzed.Order, then for the equivalent tuning coil L of arc suppression coil, the integration of energy is absorbed
Formula is：.Analyze its Functional Quality and understand that the equivalent tuning coil L for arc suppression coil is one
Not dissipative cell, in a cycle of power current, absorption is equal with the energy discharged, and presentation is the state do not done work.
Next to that working characteristics of the analysis arc suppression coil under chopping current, now needs to consider arc suppression coil in actual work
Equivalent loss resistance in work, the equivalent circuit of arc suppression coil is by equivalent tuning coil L and loss resistance under this state
Parallel connection is formed.Flow through loss resistanceElectric current in branch roadWith total electric currentBetween relation be,
In engineer applied.Therefore, and makeOverall is in perception.Assuming that the electric current to flowing through arc suppression coil branch road
Dammed, the electric current in arc suppression coil is flowed through before damming is, then, upon openingMoment, root
Understood according to the Kirchoff s voltage theorem in circuit, and,.Because flow through the electric current in arc suppression coil
It can not be mutated before and after damming, thus, the zero input step response characteristic in Circuit theory can
Know, for tuning coil L and loss resistanceIn the loop of composition, time constant, arc suppression coil tuning coil L two can be obtained
The voltage at end is:, make its initial magnitude be：,
Then the instantaneous power of inductance L absorptions is：, analysisWithFunctional Quality understand, in 0 ~ 2 π,
When separating brake angle is positioned at 0, π, 2 π, the energy stored in arc suppression coil is 0, and the initial magnitude of its both end voltage is also 0, and if
When separating brake angle is pi/2, now although the instantaneous power of arc suppression coil is 0, but the energy of its storage has reached extreme value,
Need to consider the extinguishing of electric arc and the release of energy.Arc suppression coil both ends are now connected in parallel on using Zinc-Oxide Arrester, when its electricity
When pressure is higher than the origination action voltage of Zinc-Oxide Arrester, arrester conducting, the energy for making to store in arc suppression coil is released,
And its both end voltage is clamped down on below insulation withstanding voltage.
The present invention by equivalent the tuning coil L and Zinc-Oxide Arrester of arc suppression coil substitutional resistance R by forming one
Resistance sense shunt circuit, the characteristic using Zinc-Oxide Arrester are insulation against ground under normal operating condition, and in high-voltage state
The lower characteristic that conducting is presented, serves as continuous current circuit of the arc suppression coil under overvoltage, arc suppression coil is blocked electricity in any power frequency
Flowing down can safe and stable operation.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the structural representation of the multi-functional political education publicity board of the present invention；
Fig. 2 is the system construction drawing of the present invention.
Embodiment
It is as follows to the further displaying of technical solution of the present invention, embodiment with reference to Fig. 1 and Fig. 2：
Present embodiments provide it is a kind of be used for guard method of the arc suppression coil under chopping current, comprise the following steps：
S1, at the both ends of arc suppression coil it is arranged in parallel Zinc-Oxide Arrester；
The equivalent tuning coil L of the lightning-arrest substitutional resistance R of S2, the zinc oxide and arc suppression coil forms a resistance inductive parallel and returned
Road；
The insulation against ground under normal operating conditions of S3, Zinc-Oxide Arrester, and the characteristic of conducting is presented under high-voltage state, fill
When continuous current circuit of the arc suppression coil under overvoltage, make arc suppression coil can safety and stability fortune under any power frequency chopping current
OK.
The guard method is in 35kV in power system and the power distribution network of following voltage class, being connected to grounding transformer
On neutral point, perceptual path is connected to form with grounding net of transformer substation, is provided for power distribution network when singlephase earth fault occurs
Inductance current is to compensate the device of the capacitance current of trouble point.
First to the 50HZ power currents flowed through in normal arc suppression coil under compensation of ground system in power distribution network and absorption
The energy response of release is analyzed.Order, then for the equivalent tuning coil L of arc suppression coil, the integration of energy is absorbed
Formula is：.Analyze its Functional Quality and understand that the equivalent tuning coil L for arc suppression coil is one
Not dissipative cell, in a cycle of power current, absorption is equal with the energy discharged, and presentation is the state do not done work.
Next to that working characteristics of the analysis arc suppression coil under chopping current, now needs to consider arc suppression coil in actual work
Equivalent loss resistance in work, the equivalent circuit of arc suppression coil is by equivalent tuning coil L and loss resistance under this state
Parallel connection is formed.Flow through loss resistanceElectric current in branch roadWith total electric currentBetween relation be,
In engineer applied.Therefore, and makeOverall is in perception.Assuming that the electric current to flowing through arc suppression coil branch road
Dammed, the electric current in arc suppression coil is flowed through before damming is, then, upon opening
Moment, it can be seen from the Kirchoff s voltage theorem in circuit, and,.Because flow through arc suppression coil
In electric current dam it is front and rear can not be mutated, thus, the zero input step response characteristic in Circuit theory
Understand, for tuning coil L and loss resistanceIn the loop of composition, time constant, arc suppression coil tuning coil L two can be obtained
The voltage at end is:, make its initial magnitude be：, then inductance L
The instantaneous power of absorption is：, analysisWithFunctional Quality understand, in 0 ~ 2 π, when separating brake angle position
When 0, π, 2 π, the energy stored in arc suppression coil is 0, and the initial magnitude of its both end voltage is also 0, and if separating brake angle is
During pi/2, now although the instantaneous power of arc suppression coil is 0, but the energy of its storage has reached extreme value, it is necessary to consider electricity
The extinguishing of arc and the release of energy.Arc suppression coil both ends are now connected in parallel on using Zinc-Oxide Arrester, when its voltage is higher than oxidation
During the origination action voltage of zinc arrester, arrester conducting, the energy for making to store in arc suppression coil is released, and by its both ends
Voltage clamp is below insulation withstanding voltage.
Referring to Fig. 1, for the principle of equivalence figure of the invention as illustrated, Zinc-Oxide Arrester is in parallel with arc suppression coil, tail end is common
With being connected in the grounded screen of transformer station, in zero-potential point.In compensation of ground system, in the case of no chopping current,
Big impedance state is presented in Zinc-Oxide Arrester, makes the head end insulation against ground of arc suppression coil, so as to not influence the normal of arc suppression coil
Operation.
Referring to Fig. 2, energy is absorbed in power current, in arc suppression coil and flows through current waveform figure therein, if not sending out
Life dam, then arc suppression coil can stable operation, when angle of damming is in pi/2, under the protection of Zinc-Oxide Arrester,
The voltage at arc suppression coil both ends can be limited, and the energy stored is also discharged.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, this area is common
Other modifications or equivalent substitution that technical staff is made to technical scheme, without departing from technical solution of the present invention
Spirit and scope, all should cover among scope of the presently claimed invention.
Claims (2)
1. a kind of be used for guard method of the arc suppression coil under chopping current, it is characterised in that：Comprise the following steps：
S1, at the both ends of arc suppression coil it is arranged in parallel Zinc-Oxide Arrester；
The equivalent tuning coil L of the lightning-arrest substitutional resistance R of S2, the zinc oxide and arc suppression coil forms a resistance inductive parallel and returned
Road；
The insulation against ground under normal operating conditions of S3, Zinc-Oxide Arrester, and the characteristic of conducting is presented under high-voltage state, fill
When continuous current circuit of the arc suppression coil under overvoltage, make arc suppression coil can safety and stability fortune under any power frequency chopping current
OK.
2. it is used for guard method of the arc suppression coil under chopping current as claimed in claim 1, it is characterised in that：The protection side
Method is in 35kV in power system and the power distribution network of following voltage class, being connected on the neutral point of grounding transformer, with power transformation
Grounded screen of standing is connected to form perceptual path, and inductance current is provided when singlephase earth fault occurs to compensate event for power distribution network
Hinder the device of the capacitance current of point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024771.4A CN107681646A (en) | 2017-10-27 | 2017-10-27 | It is a kind of to be used for guard method of the arc suppression coil under chopping current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024771.4A CN107681646A (en) | 2017-10-27 | 2017-10-27 | It is a kind of to be used for guard method of the arc suppression coil under chopping current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107681646A true CN107681646A (en) | 2018-02-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711024771.4A Pending CN107681646A (en) | 2017-10-27 | 2017-10-27 | It is a kind of to be used for guard method of the arc suppression coil under chopping current |
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| Country | Link |
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| CN (1) | CN107681646A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253045A (en) * | 2020-07-20 | 2021-08-13 | 李景禄 | Dynamic arc extinction and grounding line selection method of arc extinction coil grounding mode |
| EP3747100B1 (en) * | 2018-01-30 | 2022-03-16 | Hitachi Energy Switzerland AG | Surge arrestor dimensioning in a dc power transmission system |
Citations (4)
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| CN1793997A (en) * | 2005-12-12 | 2006-06-28 | 北京丹华昊博电力科技有限公司 | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
| CN203251091U (en) * | 2013-06-03 | 2013-10-23 | 合肥天海电气技术有限公司 | Ground comprehensive protecting device for electricity utilization |
| CN204230888U (en) * | 2014-12-03 | 2015-03-25 | 国家电网公司 | A kind of neutral point of electric network mixed type earthing device |
| CN204304424U (en) * | 2014-07-02 | 2015-04-29 | 秦皇岛龙鼎电气有限公司 | A kind of single-phase earthing superpotential transfer restraint device |
-
2017
- 2017-10-27 CN CN201711024771.4A patent/CN107681646A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793997A (en) * | 2005-12-12 | 2006-06-28 | 北京丹华昊博电力科技有限公司 | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
| CN203251091U (en) * | 2013-06-03 | 2013-10-23 | 合肥天海电气技术有限公司 | Ground comprehensive protecting device for electricity utilization |
| CN204304424U (en) * | 2014-07-02 | 2015-04-29 | 秦皇岛龙鼎电气有限公司 | A kind of single-phase earthing superpotential transfer restraint device |
| CN204230888U (en) * | 2014-12-03 | 2015-03-25 | 国家电网公司 | A kind of neutral point of electric network mixed type earthing device |
Non-Patent Citations (1)
| Title |
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| 张雨时: "论用中性点避雷器限制弧光接地过电压", 《电瓷避雷器》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3747100B1 (en) * | 2018-01-30 | 2022-03-16 | Hitachi Energy Switzerland AG | Surge arrestor dimensioning in a dc power transmission system |
| CN113253045A (en) * | 2020-07-20 | 2021-08-13 | 李景禄 | Dynamic arc extinction and grounding line selection method of arc extinction coil grounding mode |
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Application publication date: 20180209 |