CN102623976A - Combined type grounding system of reactor and resistor in power distribution network - Google Patents
Combined type grounding system of reactor and resistor in power distribution network Download PDFInfo
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- CN102623976A CN102623976A CN2012100812626A CN201210081262A CN102623976A CN 102623976 A CN102623976 A CN 102623976A CN 2012100812626 A CN2012100812626 A CN 2012100812626A CN 201210081262 A CN201210081262 A CN 201210081262A CN 102623976 A CN102623976 A CN 102623976A
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- grounding
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- power distribution
- distribution network
- transformer
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Abstract
The invention discloses a combined type grounding system of a reactor and a resistor in a power distribution network. The combined type grounding system comprises the reactor, the resistor, a controller and a grounding transformer for connecting a bus, wherein the grounding transformer is connected with a neutral point of a power distribution network; one end of the reactor is connected with the end of the neutral point, which is connected with the grounding transformer, the other end of the reactor is grounded; one end of the resistor is connected with the neutral point through a switch, the other end of the resistor is grounded; and input ends of the controller are respectively connected with the neutral point through a voltage transformer and a current transformer, one output end is grounded and the other output end is connected with the switch. According to the invention, the grounding failure of a power grid can be effectively eliminated, and safety operation of a power system is ensured.
Description
Technical field
The present invention relates to the combined grounding system of reactance and resistance in a kind of power distribution network.
Background technology
At present, the neutral grounding in distribution power network of low-voltage grade mainly contains following several kinds in the electric power system: 1. isolated neutral; 2. neutral point resistance grounded; 3. resonance grounding mode.
In isolated neutral system, when a phase fault took place, non-fault phase voltage raises the insulation weak spot maybe be breakdown, causes the phase ground short circuit, damages electric equipment.At present, in order to solve the problem that isolated neutral brings, generally adopt two kinds of grounding through arc mode or low resistance grounding modes, wherein: the grounding through arc mode can realize extinguish arcs, searches the bigger shortcoming of ground path difficulty but exist.The low resistance grounding mode exists does not have differentiation to instantaneity ground connection and permanent earth fault, shortcomings such as trip-out rate height.Therefore, existing earth neutral system can not effectively be got rid of electrical network earth fault, can not guarantee the safe operation of electric power system.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and the combined grounding system of reactance and resistance in a kind of power distribution network is provided, get rid of electrical network earth fault effectively, guarantee safe operation of power system.
The technical scheme that realizes above-mentioned purpose is:
The combined grounding system of reactance and resistance in a kind of power distribution network comprises the grounding transformer of reactor, resistance, controller and connection bus, wherein:
Said grounding transformer connects the neutral point of power distribution network;
One end of said reactor connects the end that joins of said neutral point and grounding transformer, other end ground connection;
One end of said resistance connects said neutral point through a switch, other end ground connection;
The input of said controller connects said neutral point through the voltage transformer summation current transformer respectively, an output head grounding, and another output connects said switch.
The combined grounding system of reactance and resistance in the above-mentioned power distribution network, wherein, said grounding transformer is a Z type grounding transformer.
The combined grounding system of reactance and resistance in the above-mentioned power distribution network, wherein, described bus is the 10KV bus.
The combined grounding system of reactance and resistance in the above-mentioned power distribution network, wherein, said reactor is a controlled reactor.
The invention has the beneficial effects as follows: the capacitance current of system when reactor of the present invention can compensate the instantaneity single phase ground fault fast, eliminate fault rapidly, need not tripping operation; Other resistance deals with permanent single phase ground fault, and close switch produces big electric current after dropping into resistance, realizes the selectivity tripping operation, accurately the isolated fault circuit.The present invention gets rid of electrical network earth fault effectively through the flexible variation of neutral grounding mode, has improved the power supply reliability of power distribution network and the device security of circuit.
Description of drawings
Fig. 1 is the structural representation of the combined grounding system of reactance and resistance in the power distribution network of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1, the combined grounding system of reactance and resistance in the power distribution network of the present invention comprises the grounding transformer 4 of reactor 1 resistance 2, controller 3 and connection bus, wherein:
Grounding transformer 4 connects the neutral point 5 of power distribution network;
One end of reactor 1 connects the end that joins of neutral point 5 and grounding transformer 4, other end ground connection;
One end of resistance 2 connects neutral point 5, other end ground connection through a switch 6;
Controller 3 inputs connect 5, one output head groundings of neutral point through voltage transformer 7 summation current transformers 8 respectively, and another output connects switch 6.
In the present embodiment, grounding transformer 4 is a Z type grounding transformer; Said bus is the 10KV bus; Reactor 1 is a controlled reactor; Controller 3 is to be the micro control device of kernel with the PC104 industrial computer.
In the present embodiment, when power distribution network generation earth fault, 1 pair of power network compensation of reactor is eliminated fault rapidly, need not tripping operation.Preset time is after this time internal controller 3 is judged that electrical network is a transient fault, surpassed this time; Controller 3 judges that electrical network is a permanent fault, and this moment, controller 3 control switchs 6 closures produced big electric current; Realize tripping operation, quick and precisely isolated fault circuit through route protection.The present invention gets rid of electrical network earth fault effectively through the flexible variation of neutral grounding mode, has improved the power supply reliability of power distribution network and the device security of circuit.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technical staff in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (4)
1. the combined grounding system of reactance and resistance in the power distribution network is characterized in that, comprises the grounding transformer of reactor, resistance, controller and connection bus, wherein:
Said grounding transformer connects the neutral point of power distribution network;
One end of said reactor connects the end that joins of said neutral point and grounding transformer, other end ground connection;
One end of said resistance connects said neutral point through a switch, other end ground connection;
The input of said controller connects said neutral point through the voltage transformer summation current transformer respectively, an output head grounding, and another output connects said switch.
2. the combined grounding system of reactance and resistance is characterized in that in the power distribution network according to claim 1, and said grounding transformer is a Z type grounding transformer.
3. the combined grounding system of reactance and resistance is characterized in that in the power distribution network according to claim 1, and described bus is the 10KV bus.
4. the combined grounding system of reactance and resistance is characterized in that in the power distribution network according to claim 1, and said reactor is a controlled reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100812626A CN102623976A (en) | 2012-03-23 | 2012-03-23 | Combined type grounding system of reactor and resistor in power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100812626A CN102623976A (en) | 2012-03-23 | 2012-03-23 | Combined type grounding system of reactor and resistor in power distribution network |
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| Publication Number | Publication Date |
|---|---|
| CN102623976A true CN102623976A (en) | 2012-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100812626A Pending CN102623976A (en) | 2012-03-23 | 2012-03-23 | Combined type grounding system of reactor and resistor in power distribution network |
Country Status (1)
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| CN (1) | CN102623976A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595029A (en) * | 2013-10-24 | 2014-02-19 | 杭州智光一创科技有限公司 | Fault self-adaptive ground connecting processing system and method for distribution network power grid |
| CN104319733A (en) * | 2014-08-01 | 2015-01-28 | 国家电网公司 | Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000032670A (en) * | 1998-07-09 | 2000-01-28 | Takenaka Komuten Co Ltd | Spot network receiving facility |
| CN1588741A (en) * | 2004-07-08 | 2005-03-02 | 上海思源电气股份有限公司 | Combined automatic tracing arc extinction compensation and line selecting device |
| CN201138751Y (en) * | 2007-12-11 | 2008-10-22 | 广州智光电气股份有限公司 | Earthing set equipment combining power grid controllable reaction with small resistance |
| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN202535050U (en) * | 2012-03-23 | 2012-11-14 | 上海市电力公司 | Combined type grounding system for reactance and resistor in power distribution network |
-
2012
- 2012-03-23 CN CN2012100812626A patent/CN102623976A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000032670A (en) * | 1998-07-09 | 2000-01-28 | Takenaka Komuten Co Ltd | Spot network receiving facility |
| CN1588741A (en) * | 2004-07-08 | 2005-03-02 | 上海思源电气股份有限公司 | Combined automatic tracing arc extinction compensation and line selecting device |
| CN201138751Y (en) * | 2007-12-11 | 2008-10-22 | 广州智光电气股份有限公司 | Earthing set equipment combining power grid controllable reaction with small resistance |
| CN101303387A (en) * | 2008-04-09 | 2008-11-12 | 中国石油化工股份有限公司胜利油田分公司临盘采油厂 | Direct current injection type route selecting positioning system and method thereof |
| CN202535050U (en) * | 2012-03-23 | 2012-11-14 | 上海市电力公司 | Combined type grounding system for reactance and resistor in power distribution network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595029A (en) * | 2013-10-24 | 2014-02-19 | 杭州智光一创科技有限公司 | Fault self-adaptive ground connecting processing system and method for distribution network power grid |
| CN104319733A (en) * | 2014-08-01 | 2015-01-28 | 国家电网公司 | Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20121011 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121011 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant before: Shanghai Electric Power Corporation |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120801 |