CN105720566A - Short-circuit fault current-limiting protector - Google Patents
Short-circuit fault current-limiting protector Download PDFInfo
- Publication number
- CN105720566A CN105720566A CN201610071980.3A CN201610071980A CN105720566A CN 105720566 A CN105720566 A CN 105720566A CN 201610071980 A CN201610071980 A CN 201610071980A CN 105720566 A CN105720566 A CN 105720566A
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- Prior art keywords
- current
- circuit
- short
- limiting
- electric magnet
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Classifications
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- 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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—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 distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a short-circuit fault current-limiting protector, which is applied to a power system for current-limiting delay protection of a short-circuit current. The short-circuit fault current-limiting protector comprises five components, wherein the first component is a normally closed contact; the second component is a current-limiting resistor; the third component is an electromagnet; the fourth component is a current sensor for detecting a current-limiting action state; and the fifth component is a current-limiting delay setting switch and a current-limiting delay countdown device. The working principles of the product are as follows: when a short-circuit fault appears in a power line, an electromagnet acts and separates an original line; the short-circuit current flows through the electromagnet through the current-limiting resistor, so that a current-limiting delay circuit starts the countdown function; when the timed time reaches a predetermined value, an auxiliary coil of the electromagnet is electrified for about 0.1s, and sends out a trigger signal outwards and the external protector cuts off the power line; after the external switch cuts off a power supply, the short-circuit fault current-limiting protector automatically resets, and connects the normally closed contact again.
Description
Technical field
This product relates to a kind of novel current-limiting protection device, for, in power system, doing the current-limiting protection of short circuit current.
Background technology
Present Domestic, it is common to chopper or electric fuse, carry out disjunction short circuit current.If employing electric fuse, after short trouble occurs in circuit, change electric fuse relatively complicated.If adopting chopper to carry out disjunction short circuit current, then because short circuit current is very big, and the breaking capacity of chopper is relatively limited, so, chopper is easy to be damaged by huge short circuit current.And then cause that the life-span of chopper is generally not long.And, this kind of protection switch, because typically no short circuit delay protection measure.After the least significant end of power circuit is short-circuited fault, it is easy to cause the phenomenon of tripping operation of bypassing the immediate leadership, and then cause large-area power-off.It addition, this kind of chopper, it does not have when solution short trouble occurs, the problem that the transient voltage caused significantly falls.In this case, a kind of novel product of necessary invention, carry out short-circuit protection, extend the life-span of switch；The phenomenon that preventing bypasses the immediate leadership simultaneously trips occurs；And the problem alleviating voltage decline abruptly.
Summary of the invention
This neoteric short trouble limiting protector, for a kind of device with short circuit current limitation delay protection function, for, in power system, doing the current-limiting protection of short circuit current.This device is made up of five parts, first parts is normally-closed contact, the current sensor of to be electric magnet, the 4th parts be detection current limiting action state that second parts are current-limiting resistance, the 3rd parts, the 5th parts are the inverse timing devices of current limliting delay adjustments switch and current limliting time delay.
This product is mainly used in power circuit, carries out short circuit current limitation time delay disjunction protection.The main operational principle of product is: when in power circuit, during the fault that is short-circuited, very big electric current flows through the main coil of electric magnet, electric magnet generation action, pulling normally-closed contact, separately original circuit, then short circuit current is via current-limiting resistance, flow through electric magnet, short circuit current is limited in less value.And then by current limliting delay circuit, start countdown function.When the time of timing reaches predetermined value, to electric magnet ancillary coil be energized about 0.1 second, send out triggering signal simultaneously, allow outside protector action, cut off power circuit.
At outside switch, after cutting off the electricity supply, short trouble limiting protector, automatically reset.It is again switched on original normally-closed contact.
Compared with other over-current protection devices existing, the place of this short trouble limiting protector Optimal improvements has:
1, the life-span of power protection system is greatly improved.The power protection system of existing power system, is generally adopted chopper to cut off short circuit current.But this method, can cause circuit, in cutting-off process, have very big electric arc and produce.And then need supporting good arc-suppression circuit.After mixing good arc-suppression circuit, the contact of chopper also still can be severely affected the high temperature ablation of electric current.Thus current a lot of short circuit currents protection system lifetim is very short.And the method adopting this short circuit current limitation, after carrying out current limliting, then by the relay switch of upper level, disconnecting circuit, then can significantly reduce the current change quantity in switch motion process.Thus switch contact is not easy ablated.
2, it is possible to prevent power-supply system that large-area Voltage Drop occurs.Because employing current-limiting resistance, carry out quick current limliting.Short circuit current is limited in less scope.Thus the voltage being not result in power system is pulled to very low.It is possible to prevent the phenomenon that large area voltage decline abruptly occurs.Traditional chopper.Because not adopting this short circuit current limitation protection device.In trip protection process, it is easy to cause whole partial electric grid system, the situation that global voltage is fallen occurs.
3, this product can realize cascade protection.In this short circuit current limitation delay protection device, the delay time of short-circuit protection can be freely set.After power system is short-circuited fault, by " current sensor and countdown circuit ", " current-limiting protection state " will be carried out countdown by this protector automatically; after the time of timing terminates; immediately to external output signal, allow outside switch, automatically power off.By this delay protection function, it is possible to the delay time doing least significant end is set to the shortest, upper level is set to slightly long, then upper level is longer, thus finally realizing cascade protection.Being possible to prevent the circuit at least significant end after there is short trouble, main switch is also disconnected, and large-area power outage occurs.
Traditional power supply protector, because not having the current-limiting apparatus of short circuit current, also not having corresponding set of time circuit and an inverse timing device.Thus accurate delay protection and cascade protection cannot be realized.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of short trouble limiting protector.
In figure, J is normally-closed contact；D is electric magnet, is wound with two coils in electric magnet, a circle of serving as theme, and one is ancillary coil；" two circular nested graphical symbol " together are current transformer；R is current-limiting resistance.
Detailed description of the invention
Neoteric short trouble limiting protector is a kind of device with short circuit current limitation delay protection.This device is made up of five parts, and first parts are normally-closed contact, second parts to be current-limiting resistance, the 3rd parts be electric magnet, the 4th parts are the detection current sensor of current limiting action state, the 5th parts is the inverse timing device of current limliting delay adjustments switch and current limliting time delay；This product is mainly used in power circuit, carries out short circuit current limitation time delay disjunction protection, and the main operational principle of product is; when in power circuit, during the fault that is short-circuited, very big electric current; flow through in the main coil of electric magnet, electric magnet generation action, pull normally-closed contact; separately original circuit; then short circuit current is via current-limiting resistance, flows through electric magnet, and short circuit current is limited in less value; and then by current limliting delay circuit, start countdown function；When the time of timing reaches predetermined value, to electric magnet ancillary coil be energized about 0.1 second, send out triggering signal simultaneously, allow outside protector action, cut off power circuit.
This protector; concrete connected mode is normally-closed contact one of each parts is connected with power input and current limliting current-limiting resistance; other end is connected to a fixed contact; and then this fixed contact is connected with the main coil of electric magnet; this head of normally-closed contact simultaneously; also being connected with the pull bar in electric magnet, between this contact J and current-limiting resistance, bridging has an arc-extinguish chamber；Current-limiting resistance, one connects power input, is also connected with normally-closed contact simultaneously, and other end is connected with magnet spool, and this head, is also connected with arc-extinguish chamber simultaneously；The lead-in wire of current-limiting resistance, through a current transformer, this current transformer, is used for detecting whether current limiting action occurs；The signal output part of current transformer, is connected with " short trouble detection and countdown circuit "；In current limliting countdown circuit, it is circumscribed with one " time setting circuit of short circuit time delay " and " short circuit fault signal output circuit ".
" time setting circuit of short circuit time delay " can arrange the delay time of multiple numerical value.
" short trouble detection and countdown circuit ", when short trouble occurs, can start countdown function automatically, when the time of countdown terminates, can pass through " short circuit fault signal output circuit " and externally export signal；" short trouble detection and countdown circuit " in countdown process, if short trouble disappears, automatically the time value of countdown should can be reset, externally not send signal, connect normally-closed contact automatically, allow power circuit return to normal condition simultaneously.
Between normally-closed contact and the current-limiting resistance of short trouble limiting protector, bridging has an arc-extinguish chamber.
Current-limiting resistance, it is special alloy for material, has good high-temperature stability, and is not easy deformation under high temperature, and the temperature coefficient value of resistivity is less, it is possible to bear the heavy current impact of short time preferably；The surface of this resistance, scribbles Heat Conduction Material, by moment heat rapidly by shell, can distribute in air.
In " short circuit fault signal output circuit " this circuit, employing is audion or the fast switching devices of metal-oxide-semiconductor or this class of controllable silicon, externally quickly exports signal；This circuit is while outputing signal to outside, and also one signal of output is to the ancillary coil of electric magnet, is energized to ancillary coil, by ancillary coil, allows electric magnet be maintained at lasting operating state, maintain this state about 0.1 second.
Electric magnet, one end of its coil, while being connected with the fixed contact end of normally-closed contact, also it is connected with one end of current-limiting resistance；The magnet spool other end externally exports electric current, is connected with load end；A pull bar is had inside electric magnet, the other end of pull bar is ined succession the movable end of normally-closed contact, when short trouble occurs, this pull bar pulls on the movable end of normally-closed contact, the loop making normally-closed contact disconnects, when not having short trouble or short trouble disappears, this pull bar will reset the movable end of normally-closed contact, allows normally-closed contact be maintained at closure state.
Inside at this electric magnet, there is a little spring, it is enclosed within pull bar, this spring is for carrying out reset operation to pull bar, when there is no short trouble or short trouble disappears, this pull bar, under the effect of the thrust of this little spring, allows the movable end of normally-closed contact and the fixing end of normally-closed contact, is maintained at the reset state of Guan Bi.
This electric magnet one has two actuation coils, a main coil and an ancillary coil；Main coil flows through load current, another ancillary coil is controlled by " short circuit fault signal output circuit ", in carrying out breaking operation at outside control switch, electric magnet is made to be about to the moment disappeared at short circuit current, it is continually maintained in operating state about 0.1 second, after treating the control complete disjunction circuit of switch of outside, then electric magnet is resetted.
Below against accompanying drawing 1, describe the constituted mode of short trouble limiting protector and detailed operation principle in detail.
The constituted mode of short trouble limiting protector is:
One of normally-closed contact J is connected with power input and current limliting current-limiting resistance R, and other end is connected to a fixed contact, and then this fixed contact is connected with the coil of electric magnet D, and this head of normally-closed contact, is also connected with the pull bar in electric magnet simultaneously.
Between this contact J and current-limiting resistance R, bridging has an arc-extinguish chamber.
Current-limiting resistance R, one connects power input and is connected with normally-closed contact J, and other end is connected with the main coil of electric magnet D, and this head, is also connected with arc-extinguish chamber simultaneously.
The lead-in wire of current-limiting resistance is through a current transformer.This current transformer, is used for detecting whether current limiting action occurs.The signal output part of current transformer, is connected with a current limliting countdown circuit.In current limliting countdown circuit, it is circumscribed with one " time setting circuit of short circuit time delay " and " short circuit fault signal output circuit ".
The operation principle of short trouble current-limiting protection implement body is:
Under normal circumstances, electric current, through normally-closed contact J, flows through the main coil of electric magnet D, then exports to other circuit.Ancillary coil is in off-position.Now, because of the current value in main coil, below the load current value of rated value, electric magnet D is failure to actuate.
When in circuit, when being short-circuited fault, electric current is paranormal nominal load current significantly.This big electric current, flows through the main coil of electric magnet D.Cause the generation action of electric magnet D.By a pull bar, normally-closed contact J is pulled open.Arc-extinguish chamber starts arc-suppression function, and electric current is transferred via current-limiting resistance R simultaneously, flows through in the main coil of electric magnet D, then exports to outside line.
After electric magnet generation action, the current value in current-limiting resistance, by substantially zeroed, increase considerably to hundreds of ampere, this variable signal, current transformer send " short trouble detection and countdown circuit " to.
" short trouble detection and countdown circuit " presses the time that " time setting circuit of short circuit time delay " is preset, starts the countdown function of short trouble, if in power circuit, is continued for there is short trouble.Then keep lasting countdown.
If in countdown process, short trouble eliminates.Then electric magnet D returns to original state.The pull bar of electric magnet restores, and normally-closed contact is switched on, the path of principal current, by current-limiting resistance branch road, turns to normally-closed contact branch road.Short trouble countdown circuit, resets the chronometric data of short circuit automatically.
If sustainable existence short trouble in circuit, after the time of countdown is full, by " short circuit fault signal output circuit ", outwards output triggers signal, allows the switch of outside cut off the electricity supply immediately；This circuit is while outputing signal to outside simultaneously, and also one signal of output is to the ancillary coil of electric magnet, is energized to ancillary coil, pass through ancillary coil, make electric magnet be about to the moment disappeared at short circuit current, be maintained at lasting operating state, maintain this state about 0.1 second.After treating the control complete disjunction circuit of switch of outside, then electric magnet is resetted.
At outside control switch, after cutting off the electricity supply, short circuit current limitation protection device, automatically reset, be again switched on original normally-closed contact.
Claims (10)
1. a short trouble limiting protector; it is characterized in that: this device is made up of five parts, first parts are normally-closed contact, second parts to be current-limiting resistance, the 3rd parts be electric magnet, the 4th parts are the detection current sensor of current limiting action state, the 5th parts is the inverse timing device of current limliting delay adjustments switch and current limliting time delay；This product is mainly used in power circuit, carries out short circuit current limitation time delay disjunction protection, and the main operational principle of product is; when in power circuit, during the fault that is short-circuited, very big electric current; flow through in the main coil of electric magnet, electric magnet generation action, pull normally-closed contact; separately original circuit; then short circuit current is via current-limiting resistance, flows through electric magnet, and short circuit current is limited in less value; and then by current limliting delay circuit, start countdown function；When the time of timing reaches predetermined value, to electric magnet ancillary coil be energized about 0.1 second, send out triggering signal simultaneously, allow outside protector action, cut off power circuit.
2. short trouble limiting protector according to claim 1; it is characterized in that: this protector; concrete connected mode is normally-closed contact one of each parts is connected with power input and current limliting current-limiting resistance; other end is connected to a fixed contact; and then this fixed contact is connected with the main coil of electric magnet, this head of normally-closed contact, is also connected with the pull bar in electric magnet simultaneously; between this contact J and current-limiting resistance, bridging has an arc-extinguish chamber；Current-limiting resistance, one connects power input, is also connected with normally-closed contact simultaneously, and other end is connected with magnet spool, and this head, is also connected with arc-extinguish chamber simultaneously；The lead-in wire of current-limiting resistance, through a current transformer, this current transformer, is used for detecting whether current limiting action occurs；The signal output part of current transformer, is connected with " short trouble detection and countdown circuit "；In current limliting countdown circuit, it is circumscribed with one " time setting circuit of short circuit time delay " and " short circuit fault signal output circuit ".
3. short trouble limiting protector according to claim 2, it is characterised in that: described " time setting circuit of short circuit time delay " can arrange the delay time of multiple numerical value.
4. short trouble limiting protector according to claim 2; it is characterized in that: described " short trouble detection and countdown circuit " is when short trouble occurs; countdown function can be started automatically; when the time of countdown terminates, " short circuit fault signal output circuit " can be passed through and externally export signal；" short trouble detection and countdown circuit " in countdown process, if short trouble disappears, automatically the time value of countdown should can be reset, externally not send signal, connect normally-closed contact automatically, allow power circuit return to normal condition simultaneously.
5. short trouble limiting protector according to claim 2, it is characterised in that: between described normally-closed contact and current-limiting resistance, bridging has an arc-extinguish chamber.
6. short trouble limiting protector according to claim 2; it is characterized in that: described current-limiting resistance; its material is special alloy; there is good high-temperature stability; and under high temperature, it is not easy deformation; the temperature coefficient value of resistivity is less, it is possible to bear the heavy current impact of short time preferably；The surface of this resistance, scribbles Heat Conduction Material, by moment heat rapidly by shell, can distribute in air.
7. short trouble limiting protector according to claim 2; it is characterized in that: described " short circuit fault signal output circuit "; in this circuit, employing is audion or the fast switching devices of metal-oxide-semiconductor or this class of controllable silicon, externally quickly exports signal；This circuit is while outputing signal to outside, and also one signal of output is to the ancillary coil of electric magnet, is energized to ancillary coil, by ancillary coil, allows electric magnet be maintained at lasting operating state, maintain this state about 0.1 second.
8. short trouble limiting protector according to claim 1, it is characterised in that: described electric magnet, one end of its coil, while being connected with the fixed contact end of normally-closed contact, also it is connected with one end of current-limiting resistance；The magnet spool other end externally exports electric current, is connected with load end；A pull bar is had inside electric magnet, the other end of pull bar is ined succession the movable end of normally-closed contact, when short trouble occurs, this pull bar pulls on the movable end of normally-closed contact, the loop making normally-closed contact disconnects, when not having short trouble or short trouble disappears, this pull bar will reset the movable end of normally-closed contact, allows normally-closed contact be maintained at closure state.
9. short trouble limiting protector according to claim 1; it is characterized in that: described electric magnet; inside at this electric magnet; having a little spring, be enclosed within pull bar, this spring is for carrying out reset operation to pull bar; when there is no short trouble or short trouble disappears; this pull bar, under the effect of the thrust of this little spring, allows the movable end of normally-closed contact and the fixing end of normally-closed contact, is maintained at the reset state of Guan Bi.
10. short trouble limiting protector according to claim 1, it is characterised in that: described electric magnet, this electric magnet one has two actuation coils, a main coil and an ancillary coil；Main coil flows through load current, another ancillary coil is controlled by " short circuit fault signal output circuit ", in carrying out breaking operation at outside control switch, electric magnet is made to be about to the moment disappeared at short circuit current, it is continually maintained in operating state about 0.1 second, after treating the control complete disjunction circuit of switch of outside, then electric magnet is resetted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610071980.3A CN105720566A (en) | 2016-02-02 | 2016-02-02 | Short-circuit fault current-limiting protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610071980.3A CN105720566A (en) | 2016-02-02 | 2016-02-02 | Short-circuit fault current-limiting protector |
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| Publication Number | Publication Date |
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| CN105720566A true CN105720566A (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610071980.3A Pending CN105720566A (en) | 2016-02-02 | 2016-02-02 | Short-circuit fault current-limiting protector |
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| CN (1) | CN105720566A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108447746A (en) * | 2018-05-10 | 2018-08-24 | 悉地（北京）国际建筑设计顾问有限公司 | A kind of breaker and its control method |
| CN110112714A (en) * | 2019-05-19 | 2019-08-09 | 梁根如 | A kind of current overload auto-cutout guard method |
| CN113223901A (en) * | 2021-05-06 | 2021-08-06 | 深圳瑞能电气设备有限公司 | AC double-electric switching device capable of providing current-limiting protection when grounding current is too large |
| CN113937727A (en) * | 2021-10-20 | 2022-01-14 | 傲普(上海)新能源有限公司 | Relay integrated circuit with pre-charging and short-circuit protection functions |
-
2016
- 2016-02-02 CN CN201610071980.3A patent/CN105720566A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108447746A (en) * | 2018-05-10 | 2018-08-24 | 悉地（北京）国际建筑设计顾问有限公司 | A kind of breaker and its control method |
| CN110112714A (en) * | 2019-05-19 | 2019-08-09 | 梁根如 | A kind of current overload auto-cutout guard method |
| CN110112714B (en) * | 2019-05-19 | 2021-06-22 | 江西从景节能科技有限公司 | Automatic circuit breaking protection method for current overload |
| CN113223901A (en) * | 2021-05-06 | 2021-08-06 | 深圳瑞能电气设备有限公司 | AC double-electric switching device capable of providing current-limiting protection when grounding current is too large |
| CN113937727A (en) * | 2021-10-20 | 2022-01-14 | 傲普(上海)新能源有限公司 | Relay integrated circuit with pre-charging and short-circuit protection functions |
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Application publication date: 20160629 |
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| WD01 | Invention patent application deemed withdrawn after publication |