CN101499653A - Method for protecting electrical appliance by over-current side path - Google Patents
Method for protecting electrical appliance by over-current side path Download PDFInfo
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- CN101499653A CN101499653A CNA2008102262111A CN200810226211A CN101499653A CN 101499653 A CN101499653 A CN 101499653A CN A2008102262111 A CNA2008102262111 A CN A2008102262111A CN 200810226211 A CN200810226211 A CN 200810226211A CN 101499653 A CN101499653 A CN 101499653A
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- electric equipment
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- closure
- protected
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005674 electromagnetic induction Effects 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000013003 hot bending Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The invention provides a method for protecting electrical equipment with an over-current bypass. When the current passing through the electrical equipment exceeds the allowable range, a switch which is connected with the electrical equipment in parallel can be rapidly turned off, the current flows through the current bypass of the electrical equipment, thereby protecting the electrical equipment and simultaneously ensuring the continuous performance of the loop current.
Description
Technical field
The present invention relates to the electric equipment field of electric power system, be specifically related to a kind of method that adopts the electric equipment in the over-current side path protection electric power system.
Background technology
Electric equipment in the electric power system, when causing electric current to increase owing to external cause (as short trouble), adopting the turn-off current loop is the effective means of avoiding the electric equipment overcurrent, as traditional overcurrent protection.
The method of tradition overcurrent protection is a lot, fuse (fuse) for example, when electric current increases to certain numerical value, electric current cause risings of fuse temperature to melting, electric current is cut off; Bimetallic hot bending circuit breaker for example, the compressing tablet of circuit breaker adopt bimetallic to make, and when electric current increased, because the difference of the thermal coefficient of expansion of different metal causes metal bending, and discharges disconnection with switch contact, thereby electric current was cut off; Electromagnetic breaker for example is that electric current is inserted breaker coil again, and the big more adhesive armature power of the big more magnetic flux of the big more ampere-turn of electric current is big more, when electromagnetic force adhesive action during greater than the spring resistance set, switch contact is disconnected.
But when outside line required to keep continuous current, overcurrent produced contradiction with cutout.The preferred embodiments of dealing with problems promptly is to utilize bypass technology, with fault current bypass or shunting.
The present invention adopts bypass mode protection electric equipment.When the electric current by electric equipment surpasses allowed band, the switch closure of electric equipment will be parallel to.Make the current bypass that flows through electric equipment, thus the protection electric equipment.
Suppress in the transformer neutral point direct current technology in capacitance method, because electrical network generation three-phase imbalance fault causes the transformer neutral point zero-sequence current to increase, the long-time overcurrent of thyristor that is series at the transformer neutral point loop may cause thyristor to damage, and disconnects thyristor current flows and will cause the transformer neutral point can not effective grounding.By the bypass protection switch, promptly can guarantee the continuation of transformer fault electric current, realize the overcurrent protection in thyristor loop simultaneously.
Summary of the invention
Method of the present invention is different fully with traditional over-current protection method, is not all electric currents and electric equipment are disconnected, and method of the present invention is and over-current sensor of protected devices in series or solenoid, is used to respond to overcurrent.Current sensor or solenoid start the switch closure in parallel with protected equipment when electric current surpass to be set definite value, before electric equipment is not damaged with current bypass or shunting.
Therefore; the present invention proposes a kind of method that adopts over-current side path protection electric equipment; it is characterized in that utilizing bypass means with the overcurrent bypass or be diverted to the switch loop that is parallel to protected electric equipment; at described protected electric equipment loop series current transducer or solenoid in order to the induction overcurrent; transducer or solenoid directly or indirectly drive the switch that is parallel to described protected electric equipment; make its closure, the electric current that flows through described protected electric equipment is all or part of to be diverted on the switch loop thereby make.
The invention allows for a kind of device that uses said method; it is characterized in that in the electric equipment circuit of electric power system, being provided with the switch in parallel with protected electric equipment; described switch is provided with the control switch closure; the switch closure electromagnetic induction coil that disconnects; described closed electromagnetic induction coil is connected with protected electric equipment; when described switch is in off-state; described protected electric equipment enters operating state; electric current flows into described protected electric equipment by described switch closure electromagnetic induction coil; set the setting current value of described switch closure electromagnetic induction coil; make the electric current of electric equipment switch closure electromagnetic induction coil under the situation of operate as normal supply current can not make switch enter closure state; when described protected electric equipment supply current surpasses the setting current value of described setting; the electromagnetic force driving switch closure of described switch closure electromagnetic induction coil; because the contact impedance of switch contact less than the internal driving of electric equipment, will make the electric current overwhelming majority on the electric equipment or all be diverted on the switch contact.
Closure, the opening operation of the described switch of said apparatus are controlled by microcontroller; adopt current sensor to connect with protected electric equipment; utilize described microcontroller to carry out the A/D conversion; the output control signal is described switch closure when microcontroller detects overcurrent on the described current sensor, makes the electric current overwhelming majority on the protected electric equipment or all is diverted on the described switch contact.
Therefore the present invention has following advantage: adopt the switch bypass fault current, protect electric component on the one hand, on the other hand, guarantee the continuity of electric current.
Description of drawings
Fig. 1 is the circuit diagram of technical solution of the present invention.
Embodiment
Implementation method one:
A switch in parallel with protected electric equipment.When switch was in closure state, electric equipment was in non operating state (by switch bypass); Electric equipment is in running order when switch is in off-state.The closed electromagnetic induction coil of switch is series at protected electric equipment.Switch can be realized normal closed or disconnect by other controlling organization, thereby changes the operating state (put into operation or out of service) of electric equipment.
When switch was in off-state, electric equipment entered operating state, and electric current flows into electric equipment by the switch closure electromagnetic induction coil.Adjust the setting value of switch closure electromagnetic induction coil, make the electric current of electric equipment electromagnetic induction coil under the situation of operate as normal supply current can not make switch enter closure state.When the electric equipment supply current surpassed setting current, electromagnetic force driving switch closure was because the contact impedance of switch contact is less than the internal driving of electric equipment.To make the electric current overwhelming majority of electric equipment or all be diverted on the switch contact.
Implementation method two:
Can adopt method for indirectly controlling to realize the closed protection of overcurrent control switch, as adopting current sensor, utilize microcontroller to carry out the A/D conversion, the output control signal is with switch closure bypass electric equipment when microcontroller detects overcurrent.
The present invention has been described according to preferred embodiment.Obviously, reading and understanding above-mentioned detailed description postscript and can make multiple correction and replacement.What this invention is intended to is that the application is built into all these corrections and the replacement that has comprised within the scope that falls into the appended claims or its equivalent.
Claims (3)
1, a kind of method that adopts over-current side path protection electric equipment; it is characterized in that utilizing bypass means with the overcurrent bypass or be diverted to the switch loop that is parallel to protected electric equipment; at described protected electric equipment loop series current transducer or solenoid in order to the induction overcurrent; transducer or solenoid directly or indirectly drive the switch that is parallel to described protected electric equipment; make its closure, the electric current that flows through described protected electric equipment is all or part of to be diverted on the switch loop thereby make.
2; a kind of device that uses the method in the claim 1; it is characterized in that in the electric equipment circuit of electric power system, being provided with the switch in parallel with protected electric equipment; described switch is provided with the control switch closure; the switch closure electromagnetic induction coil that disconnects; described closed electromagnetic induction coil is connected with protected electric equipment; when described switch is in off-state; described protected electric equipment enters operating state; electric current flows into described protected electric equipment by described switch closure electromagnetic induction coil; set the setting current value of described switch closure electromagnetic induction coil; make the electric current of electric equipment switch closure electromagnetic induction coil under the situation of operate as normal supply current can not make switch enter closure state; when described protected electric equipment supply current surpasses the setting current value of described setting; the electromagnetic force driving switch closure of described switch closure electromagnetic induction coil; because the contact impedance of switch contact less than the internal driving of electric equipment, will make the electric current overwhelming majority on the electric equipment or all be diverted on the switch contact.
3, device as claimed in claim 2; the closure, the opening operation that it is characterized in that described switch are controlled by microcontroller; adopt current sensor to connect with protected electric equipment; utilize described microcontroller to carry out the A/D conversion; the output control signal is described switch closure when microcontroller detects overcurrent on the described current sensor, makes the electric current overwhelming majority on the protected electric equipment or all is diverted on the described switch contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102262111A CN101499653A (en) | 2008-11-07 | 2008-11-07 | Method for protecting electrical appliance by over-current side path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102262111A CN101499653A (en) | 2008-11-07 | 2008-11-07 | Method for protecting electrical appliance by over-current side path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101499653A true CN101499653A (en) | 2009-08-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102262111A Pending CN101499653A (en) | 2008-11-07 | 2008-11-07 | Method for protecting electrical appliance by over-current side path |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101499653A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656000A (en) * | 2014-11-08 | 2016-06-08 | 孙麓轩 | Novel surge protector |
| CN106067671A (en) * | 2014-11-08 | 2016-11-02 | 孙麓轩 | A kind of Novel electric surge protector |
| CN106067669A (en) * | 2014-11-08 | 2016-11-02 | 孙麓轩 | A kind of Novel electric surge protector |
| CN108475908A (en) * | 2016-01-14 | 2018-08-31 | 三菱电机株式会社 | Power equipment |
-
2008
- 2008-11-07 CN CNA2008102262111A patent/CN101499653A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656000A (en) * | 2014-11-08 | 2016-06-08 | 孙麓轩 | Novel surge protector |
| CN106067671A (en) * | 2014-11-08 | 2016-11-02 | 孙麓轩 | A kind of Novel electric surge protector |
| CN106067669A (en) * | 2014-11-08 | 2016-11-02 | 孙麓轩 | A kind of Novel electric surge protector |
| CN108475908A (en) * | 2016-01-14 | 2018-08-31 | 三菱电机株式会社 | Power equipment |
| CN108475908B (en) * | 2016-01-14 | 2020-07-28 | 三菱电机株式会社 | Power equipment |
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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: 20130130 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130130 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 China Electric Power Research Institute of the Ministry of science and technology Applicant after: China Electric Power Research Institute Applicant after: State Grid Corporation of China Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 China Electric Power Research Institute of the Ministry of science and technology Applicant before: China Electric Power Research Institute |
|
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20090805 |