CN104332963A - Prevention method for switching overvoltage of vacuum breaker - Google Patents
Prevention method for switching overvoltage of vacuum breaker Download PDFInfo
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- CN104332963A CN104332963A CN201410654451.7A CN201410654451A CN104332963A CN 104332963 A CN104332963 A CN 104332963A CN 201410654451 A CN201410654451 A CN 201410654451A CN 104332963 A CN104332963 A CN 104332963A
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Abstract
The invention discloses a prevention method for the switching overvoltage of a vacuum breaker. The prevention method is characterized by comprising the following methods: capacitance protection, R-C (Resistance-Capacitance) protection, nonlinear resistance protection, induction protection, using a breaker with a lower chopping current value, and using an R-C loop absorption device. According to the prevention method provided by the invention, the overvoltage can be effectively prevented, and the operation safety of a circuit can be ensured.
Description
Technical field
The design relates to the prevention method of Overvoltage of Vacuum Disconnectors in Operation, belongs to technical field of electric appliances.
Background technology
Vacuum circuit-breaker has that extinguishing voltage is low, arc extinguishing ability is strong, breaking speed is fast, cut-off the features such as capacity is large, long service life, adaptation frequent operation, instead of other type of switch gradually, be widely used in electric power system.But vacuum circuit-breaker can produce overvoltage in interrupting process, if be in operation improper use, also can cause the accidents such as circuit breaker blast, bring significant impact to safety in production.The superpotential safeguard procedures of research and exploitation are very necessary.
Summary of the invention
According to above-mentioned requirements, the object of the design is to provide the prevention method of Overvoltage of Vacuum Disconnectors in Operation, effectively to avoid superpotential generation.
For achieving the above object, the design is realized by following technological means:
The prevention method of Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: comprise following methods: hold protection, resistance-capacitance protection, nonlinear resistance protection, inductance protection, use circuit breaker, use R-C capacitance-resistance loop absorption plant that shut off value is lower.
Further:
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: described appearance protection is shunt capacitor on inductive load end, effectively reduces load impedance, thus reduces the amplitude of cut-off overvoltage.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: described resistance-capacitance protection is connected resistance R and is connected in parallel on load end of incoming cables as protection component and forms RC excess voltage suppressor with electric capacity C.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: described nonlinear resistance protection is for adopting common lightning arrester in parallel with capacitor, and common lightning arrester energy over-voltage amplitude, electricity container slows down overvoltage rising steepness.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation; it is characterized in that: described inductance protection is the LR excess voltage suppressor of series reactance coil or saturable reactor composition in parallel with a resistor between vacuum circuit-breaker and motor cable, thus the rising steepness of over-voltage suppression and peak value.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: the circuit breaker that described use shut off value is lower is that arc control device contact material adopts chromiumcopper.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, it is characterized in that: described use R-C capacitance-resistance loop absorption plant is made up of resistance and electric capacity, the effect of resistance R increases attenuation coefficient, and consume higher-order of oscillation electric energy, the effect of electric capacity C is over-voltage wave head steepness.
The invention has the beneficial effects as follows: the present invention can effectively avoid superpotential generation, ensure the security of operation of circuit.
Embodiment
The prevention method of Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: comprise following methods: hold protection, resistance-capacitance protection, nonlinear resistance protection, inductance protection, use circuit breaker, use R-C capacitance-resistance loop absorption plant that shut off value is lower.
Further:
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: described appearance protection is shunt capacitor on inductive load end, effectively reduces load impedance, thus reduces the amplitude of cut-off overvoltage.
Hold protection shunt capacitor on inductive load end; load impedance can be effectively reduced; thus reduce the amplitude of cut-off overvoltage; superpotential leading-edge steepness can also be slowed down; this can not only protect inductive load; exempt from the infringement of cut-off overvoltage, the harm that Multiple subcutaneous insulin infusion insulate to motor can also be alleviated.Vacuum circuit-breaker is connected with cable with between transformer or motor, and because cable has larger distributed capacitance, its effect is equal to shunt capacitance, and effect is fine.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: described resistance-capacitance protection is connected resistance R and is connected in parallel on load end of incoming cables as protection component and forms RC excess voltage suppressor with electric capacity C.
Resistance-capacitance protection is connected resistance R and is connected in parallel on load end of incoming cables as protection component and forms RC excess voltage suppressor with electric capacity C.Capacitor both can slow down superpotential rising steepness, can reduce again the wave impedance of load, thus reduce cut-off overvoltage.The effect of resistance is: when damming, and its existence adds the attenuation coefficient of high-frequency discharge circuit, can reduce and restrikes number of times and reduce Multiple subcutaneous insulin infusion, even can effectively prevent it from occurring.Protect motor even load by RC inhibitor, effect is best.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: described nonlinear resistance protection is for adopting common lightning arrester in parallel with capacitor, and common lightning arrester energy over-voltage amplitude, electricity container slows down overvoltage rising steepness.
Adopt common lightning arrester in parallel with capacitor, common lightning arrester energy over-voltage amplitude, electricity container slows down overvoltage rising steepness.Adopt metal oxide arrester, it adopts ZnO piezo-resistance, is the lightning arrester without gap in arcing chamber, has the characteristic that semiconductor transistor is stable.Under normal working voltage, resistance is very large, and electric current is very little, and when voltage increases to a certain value, resistance declines, and presents stability characteristic (quality).It should be noted that and adopt metal oxide arrester to make overvoltage protection, its model will conform to system voltage, and inductive load or capacity of capacitor bank should mate appropriately.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation; it is characterized in that: described inductance protection is the LR excess voltage suppressor of series reactance coil or saturable reactor composition in parallel with a resistor between vacuum circuit-breaker and motor cable, thus the rising steepness of over-voltage suppression and peak value.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: the circuit breaker that described use shut off value is lower is that arc control device contact material adopts chromiumcopper.
The prevention method of described Overvoltage of Vacuum Disconnectors in Operation, it is characterized in that: described use R-C capacitance-resistance loop absorption plant is made up of resistance and electric capacity, the effect of resistance R increases attenuation coefficient, and consume higher-order of oscillation electric energy, the effect of electric capacity C is over-voltage wave head steepness.
Because the cut-off overvoltage of vacuum circuit-breaker is relevant with the shut off value of circuit breaker, shut off value its Overvoltage Amplitude less is less.And the shut off value of circuit breaker is relevant with contact of breaker material, therefore should be specifically noted that when circuit breaker design type selecting and select suitable contact material, to reduce the shut off value of circuit breaker, reduce cut-off overvoltage.At present, arc control device contact material mostly is chromiumcopper, and shut off value is about 1A.
More than show and describe the general principle of the design, principal character and advantage.The technical staff of the industry should understand; the design is not restricted to the described embodiments; the principle that the design is just described described in above-described embodiment and specification; under the prerequisite not departing from the design's spirit and scope; the design also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the design.The claimed scope of the design is defined by appending claims and equivalent thereof.
Claims (7)
1. the prevention method of Overvoltage of Vacuum Disconnectors in Operation, is characterized in that: comprise following methods: hold protection, resistance-capacitance protection, nonlinear resistance protection, inductance protection, use circuit breaker, use R-C capacitance-resistance loop absorption plant that shut off value is lower.
2. the prevention method of Overvoltage of Vacuum Disconnectors in Operation as claimed in claim 1, is characterized in that: described appearance protection is shunt capacitor on inductive load end, effectively reduces load impedance, thus reduces the amplitude of cut-off overvoltage.
3. the prevention method of Overvoltage of Vacuum Disconnectors in Operation as claimed in claim 1, is characterized in that: described resistance-capacitance protection is connected resistance R and is connected in parallel on load end of incoming cables as protection component and forms RC excess voltage suppressor with electric capacity C.
4. the prevention method of Overvoltage of Vacuum Disconnectors in Operation as claimed in claim 1; it is characterized in that: described nonlinear resistance protection is for adopting common lightning arrester in parallel with capacitor; common lightning arrester energy over-voltage amplitude, electricity container slows down overvoltage rising steepness.
5. the prevention method of Overvoltage of Vacuum Disconnectors in Operation as claimed in claim 1; it is characterized in that: described inductance protection is the LR excess voltage suppressor of series reactance coil or saturable reactor composition in parallel with a resistor between vacuum circuit-breaker and motor cable, thus the rising steepness of over-voltage suppression and peak value.
6. the prevention method of Overvoltage of Vacuum Disconnectors in Operation as claimed in claim 1, is characterized in that: the circuit breaker that described use shut off value is lower is that arc control device contact material adopts chromiumcopper.
7. the prevention method of Overvoltage of Vacuum Disconnectors in Operation as claimed in claim 1, it is characterized in that: described use R-C capacitance-resistance loop absorption plant is made up of resistance and electric capacity, the effect of resistance R increases attenuation coefficient, consume higher-order of oscillation electric energy, the effect of electric capacity C is over-voltage wave head steepness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410654451.7A CN104332963A (en) | 2014-11-18 | 2014-11-18 | Prevention method for switching overvoltage of vacuum breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410654451.7A CN104332963A (en) | 2014-11-18 | 2014-11-18 | Prevention method for switching overvoltage of vacuum breaker |
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| Publication Number | Publication Date |
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| CN104332963A true CN104332963A (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410654451.7A Pending CN104332963A (en) | 2014-11-18 | 2014-11-18 | Prevention method for switching overvoltage of vacuum breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474314A (en) * | 2019-09-03 | 2019-11-19 | 国家电网有限公司 | A kind of shunt capacitor overvoltage absorbing device |
| CN110988751A (en) * | 2019-12-09 | 2020-04-10 | 西安欣东源电气有限公司 | Circuit and method for detecting turn-to-turn short circuit fault of reactor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280802A (en) * | 2013-05-31 | 2013-09-04 | 国家电网公司 | Paralleling reactor operation overvoltage managing circuit and managing method of paralleling reactor operation overvoltage managing circuit |
-
2014
- 2014-11-18 CN CN201410654451.7A patent/CN104332963A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280802A (en) * | 2013-05-31 | 2013-09-04 | 国家电网公司 | Paralleling reactor operation overvoltage managing circuit and managing method of paralleling reactor operation overvoltage managing circuit |
Non-Patent Citations (2)
| Title |
|---|
| 刘桂霞: "真空断路器的操作过电压及其防护", 《电气技术》 * |
| 程根宣: "真空断路器的操作过电压及其防护措施", 《淮北职业技术学院学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474314A (en) * | 2019-09-03 | 2019-11-19 | 国家电网有限公司 | A kind of shunt capacitor overvoltage absorbing device |
| CN110988751A (en) * | 2019-12-09 | 2020-04-10 | 西安欣东源电气有限公司 | Circuit and method for detecting turn-to-turn short circuit fault of reactor |
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Application publication date: 20150204 |
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