CN107895933A - The voltage transformer overvoltage protection suppressed using resistance sampling resistance - Google Patents
The voltage transformer overvoltage protection suppressed using resistance sampling resistance Download PDFInfo
- Publication number
- CN107895933A CN107895933A CN201711278976.5A CN201711278976A CN107895933A CN 107895933 A CN107895933 A CN 107895933A CN 201711278976 A CN201711278976 A CN 201711278976A CN 107895933 A CN107895933 A CN 107895933A
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage transformer
- sampling
- suppressed
- normally closed
- 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.)
- Pending
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 38
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 abstract description 4
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of voltage transformer overvoltage protection suppressed using resistance sampling resistance.It includes the voltage transformer (1) being connected across between bus and ground wire, and the impedance that the current-limiting resistor (2) by being connected in parallel and normally closed switch (3) form particularly is connected in series between the primary side and ground wire of voltage transformer (1) and suppresses component；The overvoltage sampling assemble being made up of the ZnO resistors device (7) by being connected in series and sampling resistor (6) is also bridged between bus and ground wire；The both ends of sampling resistor (6) electrically connect through delayer (5), driver (4) with the control terminal of normally closed switch (3).It rational in infrastructure, practical, can completely effectively avoid steep wave disturb caused by system zero sequence vibrate harm to voltage transformer, can be widely used in the protection to voltage transformer in the power supply-distribution system that 6 35kV neutral points are not directly grounded.
Description
Technical field
The present invention relates to a kind of overvoltage protection, especially a kind of mutual induction of voltage suppressed using resistance sampling resistance
Device overvoltage protection.
Background technology
In the power supply-distribution system that the 6-35kV neutral points in China are not directly grounded, voltage transformer be people must prison
The equipment for surveying voltage.At present, it is the impact of various overvoltage in anti-locking system, people often concatenate in the primary side of voltage transformer
Fuse, such as entitled " the reason for Fusing of Multiphase Fuse of 10-35 kV TV at Lightning Stroke is analyzed ",《Power equipment》2004 3
Month the 3rd the 45-48 pages of the article of phase of volume 5.This article discusses isolated neutral system by taking 110kV Yu Xi transformer stations as an example
The a variety of causes and processing method that middle voltage transformer primary side fuse fuses in thunderbolt；However, its fail to solve due to
System zero sequence vibration harm to caused by voltage transformer caused by thunderbolt or switching overvoltage --- the energy of zero sequence vibration is only
It can be discharged by the voltage transformer in system, the energy of release can cause mutual with voltage according to the randomness vibrated when serious
The fuse failure of sensor concatenation, will cause burning for voltage transformer when even more serious, and make the protection misoperation of system, so as to
The generation of initiation system large area blackout.
The content of the invention
The technical problem to be solved in the present invention is to overcome weak point of the prior art, there is provided a kind of rational in infrastructure, real
The voltage transformer overvoltage protection suppressed using resistance sampling resistance.
To solve the technical problem of the present invention, used technical scheme is the voltage suppressed using resistance sampling resistance
Transformer overvoltage protection includes the voltage transformer being connected across between bus and ground wire, particularly：
Impedance is connected in series between the primary side and ground wire of the voltage transformer and suppresses component, the impedance suppresses component
It is made up of the current-limiting resistor and normally closed switch that are connected in parallel；
Between the bus and ground wire also bridging has an overvoltage sampling assemble, and the overvoltage sampling assemble is by being connected in series
ZnO resistors device and sampling resistor composition；
The both ends of the sampling resistor electrically connect through delayer, driver with the control terminal of normally closed switch.
It is taken as the further improvement of the voltage transformer overvoltage protection of resistance sampling resistance suppression：
Preferably, the resistance of current-limiting resistor is 5-10k Ω.
Preferably, normally closed switch is mechanical normally closed switch, or electronic type normally closed switch.
Preferably, the resistance of sampling resistor is 5-15m Ω.
Preferably, delayer is delay circuit, or the time relay, its delay time are 50-150ms.
It is relative to the beneficial effect of prior art：
After such structure, if occur thunderbolt or switching overvoltage, overvoltage sampling assemble will output signal,
To control normally closed switch to disconnect by delayer and driver, the zero sequence oscillation energy in system is set to suppress component via impedance
In current-limiting resistor gently discharge, so as to be effectively protected the voltage transformer in system, it is ensured that system safety fortune
OK.The present apparatus is rational in infrastructure, practical, can completely effectively avoid system zero sequence vibration caused by steep wave disturbance to mutual induction of voltage
The harm of device, it can be widely used in the power supply-distribution system that 6-35kV neutral points are not directly grounded to the guarantor of voltage transformer
Shield.
Brief description of the drawings
Fig. 1 is a kind of basic circuit structure schematic diagram of the present invention.
Embodiment
The preferred embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, the composition of the voltage transformer overvoltage protection suppressed using resistance sampling resistance is as follows：
Bus is connected to the voltage transformer 1 being connected in series with ground wire span and impedance suppresses component；Wherein, impedance suppression group
Part is made up of the current-limiting resistor 2 and normally closed switch 3 being connected in parallel, and the resistance of current-limiting resistor 2 therein is 8 (can be 5-10)
K Ω, normally closed switch 3 are mechanical normally closed switch (or electronic type normally closed switch).
Also bridging has overvoltage sampling assemble between bus and ground wire；Wherein, overvoltage sampling assemble is by the oxygen that is connected in series
Change zinc resistor 7 and sampling resistor 6 forms, the resistance of sampling resistor 6 therein is 10 (can be 5-15) m Ω.
The both ends of sampling resistor 6 electrically connect through delayer 5, driver 4 with the control terminal of normally closed switch 3；Wherein, it is delayed
Device 5 is delay circuit (or time relay), and its delay time is 100 (can be 50-150) ms.
In use, only need first to be applied to the voltage class in power system according to the present invention to select the electric of each component
Parameter, then input the contacts A with power system respectively by three of the voltage transformer 1 in the present invention and ZnO resistors device 7
Phase, B phases and C are electrically connected, ground wire electrically connects with the earth.
When thunderbolt or switching overvoltage occurs, because the volt-ampere of the ZnO resistors device 7 in overvoltage sampling assemble is special
Property, ZnO resistors device 7 is breakdown, wherein the high current flowed through is when by way of sampling resistor 6, in the two of sampling resistor 6
End produces the sampling voltage signal that ZnO resistors device 7 punctures the moment.The sampling voltage signal keeps its voltage by delayer 5
The level 100ms of signal.The electric signal of holding by driver 4 control normally closed switch 3 disconnect, the energy in power supply-distribution system by
The current-limiting resistor 2 that impedance suppresses component absorbs, and makes power supply-distribution system due to the zero sequence oscillation energy for being struck by lightning or operating and trigger
Slowly release；So as to protect the voltage transformer 1 of system, it is ensured that the safe operation of system.
Obviously, those skilled in the art can be to the voltage transformer mistake suppressed using resistance sampling resistance of the present invention
Voltage protection carries out various changes and modification without departing from the spirit and scope of the present invention.So, if to the present invention's
These modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to include these
Including change and modification.
Claims (5)
1. a kind of voltage transformer overvoltage protection suppressed using resistance sampling resistance, including it is connected across bus and ground wire
Between voltage transformer (1), it is characterised in that：
Impedance is connected in series between the primary side and ground wire of the voltage transformer (1) and suppresses component, the impedance suppresses component
It is made up of the current-limiting resistor (2) and normally closed switch (3) that are connected in parallel；
Also bridging has an overvoltage sampling assemble between the bus and ground wire, and the overvoltage sampling assemble is by the oxidation that is connected in series
Zinc resistor (7) and sampling resistor (6) composition；
The both ends of the sampling resistor (6) electrically connect through delayer (5), driver (4) with the control terminal of normally closed switch (3).
2. the voltage transformer overvoltage protection according to claim 1 suppressed using resistance sampling resistance, it is special
Sign is that the resistance of current-limiting resistor (2) is 5-10k Ω.
3. the voltage transformer overvoltage protection according to claim 1 suppressed using resistance sampling resistance, it is special
Sign is that normally closed switch (3) is mechanical normally closed switch, or electronic type normally closed switch.
4. the voltage transformer overvoltage protection according to claim 1 suppressed using resistance sampling resistance, it is special
Sign is that the resistance of sampling resistor (6) is 5-15m Ω.
5. the voltage transformer overvoltage protection according to claim 1 suppressed using resistance sampling resistance, it is special
Sign is that delayer (5) is delay circuit, or the time relay, its delay time are 50-150ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711278976.5A CN107895933A (en) | 2017-12-06 | 2017-12-06 | The voltage transformer overvoltage protection suppressed using resistance sampling resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711278976.5A CN107895933A (en) | 2017-12-06 | 2017-12-06 | The voltage transformer overvoltage protection suppressed using resistance sampling resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107895933A true CN107895933A (en) | 2018-04-10 |
Family
ID=61807569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711278976.5A Pending CN107895933A (en) | 2017-12-06 | 2017-12-06 | The voltage transformer overvoltage protection suppressed using resistance sampling resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107895933A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161993A (en) * | 2021-02-23 | 2021-07-23 | 广东电网有限责任公司电力科学研究院 | Low-frequency oscillation suppression method and device for electromagnetic voltage transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2590234Y (en) * | 2002-12-17 | 2003-12-03 | 徐成飞 | Microcomputer arc extinguishing, wire selecting and excess voltage comprehensive protector |
| CN201312112Y (en) * | 2008-12-03 | 2009-09-16 | 徐成飞 | Overvoltage monitoring and comprehensive protective device for medium voltage power network |
| CN206401884U (en) * | 2016-12-19 | 2017-08-11 | 孙麓轩 | Surge protector and surge protection system |
| CN207530516U (en) * | 2017-12-06 | 2018-06-22 | 云南电网有限责任公司玉溪供电局 | The voltage transformer overvoltage protection inhibited using resistance sampling resistance |
-
2017
- 2017-12-06 CN CN201711278976.5A patent/CN107895933A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2590234Y (en) * | 2002-12-17 | 2003-12-03 | 徐成飞 | Microcomputer arc extinguishing, wire selecting and excess voltage comprehensive protector |
| CN201312112Y (en) * | 2008-12-03 | 2009-09-16 | 徐成飞 | Overvoltage monitoring and comprehensive protective device for medium voltage power network |
| CN206401884U (en) * | 2016-12-19 | 2017-08-11 | 孙麓轩 | Surge protector and surge protection system |
| CN207530516U (en) * | 2017-12-06 | 2018-06-22 | 云南电网有限责任公司玉溪供电局 | The voltage transformer overvoltage protection inhibited using resistance sampling resistance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161993A (en) * | 2021-02-23 | 2021-07-23 | 广东电网有限责任公司电力科学研究院 | Low-frequency oscillation suppression method and device for electromagnetic voltage transformer |
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