CN109004531A - A kind of neutral resistance complexes - Google Patents
A kind of neutral resistance complexes Download PDFInfo
- Publication number
- CN109004531A CN109004531A CN201810840460.3A CN201810840460A CN109004531A CN 109004531 A CN109004531 A CN 109004531A CN 201810840460 A CN201810840460 A CN 201810840460A CN 109004531 A CN109004531 A CN 109004531A
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- CN
- China
- Prior art keywords
- ground connection
- resistance
- neutral
- ground
- pressure side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/16—Earthing arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of neutral resistance complexes, the bus being connect with main transformer low-pressure side is connected, neutral resistance complexes include the ground connection being connected with bus become, the ground resistance that the neutral point of grounded change is connected with bus, neutral resistance complexes further include: be set to ground connection and conjugate threephase current transformer at the lead of main transformer side；Breakdown judge is carried out for the electric current according to detected by threephase current transformer, and the low-pressure side of main transformer respectively switchs output control signal and the ground connection of each switch motion in high-pressure side becomes protective device to make when detected electric current meets or exceeds current limit.The present invention can guarantee ground connection become internal fault when, quickly, action message and cut off failure, to ensure the safe operation of a complete set of equipment.
Description
Technical field
The invention belongs to power transformation industries, and in particular in a kind of modified that the neutral grounding mode of electric system uses
Property point ground resistance complexes.
Background technique
Existing neutral resistance complexes include that ground connection becomes and two major parts of ground resistance, schematic diagram
Distinguish with mode of connection figure as shown shown in Figure 1 and Figure 2.Ground connection, which becomes, is connected to bus bar side, ground resistance be connected to ground connection become with
Between ground.
For the neutral resistance complexes of the structure, when singlephase earth fault occurs on 10kV outlet route
(K1, K2) acts excision failure by outlet zero-sequence current protection.It is sent out in 10kV bus and main transformer 10kV outlet side (K3, K4, K5)
When raw singlephase earth fault, 10kV ground connection becomes the single-phase contactor that zero-sequence current protection acts the small resistance of first tripping, and substation is again
According to earth-free operational mode operation and maintenance.
When singlephase earth fault occurs for grounding transformer, 10kV ground connection becomes zero-sequence current protection and acts the small resistance of first tripping
Switch, substation is according to earth-free operational mode operation and maintenance.The protection act mode requires 10kV system that can connect losing
Ground resistance, also without arc suppression coil in the case where continue tape jam run in short-term.This method of operation only goes out in bus and the side main transformer 10V
Mouth side occurs to occur when single-phase earthing.When ground connection becomes road phase-to phase fault again, tripping is grounded transformer breaker after protection act.
When the above existing protected mode is existed for ground connection change internal fault, main transformer zero-sequenceprotection under-sensitive is asked
Topic.
Summary of the invention
Becoming internal fault for ground connection the object of the present invention is to provide one kind can be improved protection sensitivity, set to ensure
The neutral resistance complexes of standby safe operation.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of neutral resistance complexes, the bus being connect with main transformer low-pressure side are connected, the neutral ground
Resistance complexes include that the ground connection being connected with the bus becomes, the neutral point through the ground connection change is connected with the bus
Ground resistance, the neutral resistance complexes further include:
It is set to threephase current transformer of the ground connection displacement at the lead of the main transformer side；
Breakdown judge is carried out for the electric current according to detected by the threephase current transformer, and is reached in detected electric current
To or more than current limit when output control signal switch the low-pressure side of the main transformer respectively and each switch motion in high-pressure side
Ground connection becomes protective device.
It includes A/D turns for being connected and carrying out signal conversion with the threephase current transformer that the ground connection, which becomes protective device,
Parallel operation is connected with the A/D converter and carries out the data processing module that data handle and export the control signal, described
The low-pressure side of data processing module and the main transformer respectively switchs and high-pressure side respectively switchs and connects with signal.
The neutral resistance complexes further include being set to the ground connection to become between the ground resistance
Switch.
The bus and the ground connection are provided with breaker between becoming.
The breaker is set in switchgear.
The neutral resistance complexes further include becoming protective device with the ground connection to be connected to show its institute
The display of the switch state of control.
The ground connection becomes and the ground resistance is set in cabinet.
The ground resistance is variable resistance.
Due to the above technical solutions, the present invention has the following advantages over the prior art: the present invention can guarantee
Ground connection become internal fault when, quickly, action message and cut off failure, to ensure the safe operation of a complete set of equipment.
Detailed description of the invention
Attached drawing 1 is the schematic diagram of existing neutral resistance complexes
Attached drawing 2 is the mode of connection figure of existing neutral resistance complexes.
Attached drawing 3 is the schematic illustration of modified neutral resistance complexes of the invention.
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
Embodiment one: as shown in Fig. 3, a kind of modified neutral point that the bus being connect with main transformer low-pressure side is connected
Ground resistance complexes, including ground connection becomes, ground resistance and threephase current transformer, ground connection become protective device.
Ground connection becomes the bus being connect with main transformer and is connected, and is provided with breaker between bus and ground connection become, the open circuit
Device can be set in switchgear.
Threephase current transformer be set to that ground connection becomes positioned at the lead of main transformer side at and for detecting three-phase electricity respectively
Stream.
The neutral point of the grounded change of ground resistance is connected with bus, and ground connection, which becomes between ground resistance, to be additionally provided with out
It closes.Ground resistance can use variable resistance.Ground connection becomes and ground resistance is set in cabinet.
Ground connection becomes protective device and is connected with threephase current transformer, also respectively switchs with the low-pressure side of main transformer and high-pressure side is each
Switching signal connection.Sentence to be grounded change protective device for the progress of the electric current according to detected by threephase current transformer failure
It is disconnected, and when detected electric current meets or exceeds current limit output control signal come make the low-pressure side of main transformer respectively switch with
Each switch motion in high-pressure side.
Ground connection become protective device include the A/D converter for being connected and carrying out signal conversion with threephase current transformer, with
A/D converter is connected and carries out the data processing module that data handle and export control signal, data processing module and main transformer
Low-pressure side respectively switch and high-pressure side respectively switchs and connects with signal.
In addition, the neutral resistance complexes can also include be grounded become protective device be connected to show it
The display of the switch state controlled.
When ground connection becomes due to its internal fault, connecting part electric current generates variation, then detects current value and according to setting
Current limit switch the low-pressure side of main transformer respectively and each switch motion in high-pressure side, reach defencive function, it is different to pass through setting
Current limit can improve action sensitivity.
The above modified neutral resistance complexes become protection dress by adding threephase current transformer and ground connection
It sets to compensate for existing protected mode under-sensitive problem, it can be ensured that when ground connection becomes internal fault, quick, action message
And failure is cut off, to ensure the safe operation of a complete set of equipment.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of neutral resistance complexes, the bus being connect with main transformer low-pressure side are connected, the neutral point is connect
Ground resistance complexes include that the ground connection being connected with the bus becomes, the neutral point through the ground connection change is connected with the bus
The ground resistance connect, it is characterised in that: the neutral resistance complexes further include:
It is set to threephase current transformer of the ground connection displacement at the lead of the main transformer side；
Breakdown judge is carried out for the electric current according to detected by the threephase current transformer, and is reached in detected electric current
To or more than current limit when output control signal switch the low-pressure side of the main transformer respectively and each switch motion in high-pressure side
Ground connection becomes protective device.
2. a kind of neutral resistance complexes according to claim 1, it is characterised in that: the ground connection becomes protection
Device includes the A/D converter for being connected and carrying out signal conversion with the threephase current transformer and the A/D converter phase
Connect and carry out the data processing module that data handle and export the control signal, the data processing module and the main transformer
Low-pressure side respectively switch and high-pressure side respectively switchs and connects with signal.
3. a kind of neutral resistance complexes according to claim 1 or 2, it is characterised in that: the neutral point
Ground resistance complexes further include the switch for being set to the ground connection and becoming between the ground resistance.
4. a kind of neutral resistance complexes according to claim 1 or 2, it is characterised in that: the bus with
The ground connection is provided with breaker between becoming.
5. a kind of neutral resistance complexes according to claim 4, it is characterised in that: the breaker setting
In in switchgear.
6. a kind of neutral resistance complexes according to claim 1 or 2, it is characterised in that: the neutral point
Ground resistance complexes further include becoming protective device with the ground connection to be connected to show the aobvious of switch state that it is controlled
Show device.
7. a kind of neutral resistance complexes according to claim 1 or 2, it is characterised in that: the ground connection becomes
It is set in cabinet with the ground resistance.
8. a kind of neutral resistance complexes according to claim 1 or 2, it is characterised in that: the ground connection electricity
Resistance is variable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810840460.3A CN109004531A (en) | 2018-07-27 | 2018-07-27 | A kind of neutral resistance complexes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810840460.3A CN109004531A (en) | 2018-07-27 | 2018-07-27 | A kind of neutral resistance complexes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109004531A true CN109004531A (en) | 2018-12-14 |
Family
ID=64598339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810840460.3A Pending CN109004531A (en) | 2018-07-27 | 2018-07-27 | A kind of neutral resistance complexes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109004531A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682404A (en) * | 2020-06-09 | 2020-09-18 | 广东电网有限责任公司东莞供电局 | 10kV power system neutral point movable small resistor complete grounding device |
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|---|---|---|---|---|
| CN101009429A (en) * | 2006-01-16 | 2007-08-01 | 林苏 | Harmony and arc elimination method of the neutral point non-valid grounding power grid and its integrated protection device |
| CN201054500Y (en) * | 2007-06-21 | 2008-04-30 | 思源电气股份有限公司 | Direction ground arc-elimination and cable selection suite device |
| CN101499655A (en) * | 2008-11-06 | 2009-08-05 | 江苏省电力公司 | Neutral point grounding resistor plant for electrical power system |
| CN204012678U (en) * | 2014-07-01 | 2014-12-10 | 广东电网公司佛山供电局 | A kind of power distribution network multimode ground protection system |
| CN104753031A (en) * | 2015-04-26 | 2015-07-01 | 姬广超 | Neutral point complete-set protection device |
| CN105375438A (en) * | 2015-12-16 | 2016-03-02 | 国网山东省电力公司青岛供电公司 | Zero sequence current detection device for neutral point connected to grounding through small resistor and method |
| CN106159932A (en) * | 2016-06-27 | 2016-11-23 | 柳州电器科学研究所有限公司 | 10kV neutral grounding by small resistance complexes |
| CN106229998A (en) * | 2016-08-16 | 2016-12-14 | 安徽众升电力科技有限公司 | A kind of electric power monitoring system |
| CN106908693A (en) * | 2017-03-06 | 2017-06-30 | 国网浙江苍南县供电有限责任公司 | A kind of arc suppression coil earthing system single-phase grounding selecting method of high-accuracy |
-
2018
- 2018-07-27 CN CN201810840460.3A patent/CN109004531A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009429A (en) * | 2006-01-16 | 2007-08-01 | 林苏 | Harmony and arc elimination method of the neutral point non-valid grounding power grid and its integrated protection device |
| CN201054500Y (en) * | 2007-06-21 | 2008-04-30 | 思源电气股份有限公司 | Direction ground arc-elimination and cable selection suite device |
| CN101499655A (en) * | 2008-11-06 | 2009-08-05 | 江苏省电力公司 | Neutral point grounding resistor plant for electrical power system |
| CN204012678U (en) * | 2014-07-01 | 2014-12-10 | 广东电网公司佛山供电局 | A kind of power distribution network multimode ground protection system |
| CN104753031A (en) * | 2015-04-26 | 2015-07-01 | 姬广超 | Neutral point complete-set protection device |
| CN105375438A (en) * | 2015-12-16 | 2016-03-02 | 国网山东省电力公司青岛供电公司 | Zero sequence current detection device for neutral point connected to grounding through small resistor and method |
| CN106159932A (en) * | 2016-06-27 | 2016-11-23 | 柳州电器科学研究所有限公司 | 10kV neutral grounding by small resistance complexes |
| CN106229998A (en) * | 2016-08-16 | 2016-12-14 | 安徽众升电力科技有限公司 | A kind of electric power monitoring system |
| CN106908693A (en) * | 2017-03-06 | 2017-06-30 | 国网浙江苍南县供电有限责任公司 | A kind of arc suppression coil earthing system single-phase grounding selecting method of high-accuracy |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682404A (en) * | 2020-06-09 | 2020-09-18 | 广东电网有限责任公司东莞供电局 | 10kV power system neutral point movable small resistor complete grounding device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181214 |