CN202888806U - Motor directivity current quick-break protection - Google Patents
Motor directivity current quick-break protection Download PDFInfo
- Publication number
- CN202888806U CN202888806U CN 201220468243 CN201220468243U CN202888806U CN 202888806 U CN202888806 U CN 202888806U CN 201220468243 CN201220468243 CN 201220468243 CN 201220468243 U CN201220468243 U CN 201220468243U CN 202888806 U CN202888806 U CN 202888806U
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Abstract
The utility model relates to a motor directivity current quick-break protection, comprising a high fixed value component, a low fixed value component, a power direction component, a logic and relation component, a logic or relation component, and an exit relay. Current signals of the motor access the high fixed value component, the low fixed value component, and the power direction component, and meanwhile voltage signals access the power direction component. When the motor has phase fault in a starting process and current reaches setting of the high fixed value component, the high fixed value component operates, and through the logic or relation component, the exit relay is started and breaker tripping is performed. Through adding the power direction component, the motor directivity current quick-break protection further improves motor current quick-break protection, problems of quick-break protection misoperation caused by feedback current in electric protection are solved, and reliable and correct operation of current quick-break protection are realized.
Description
Technical field
The utility model relates to a kind of motor protection device, and particularly a kind of locking that realizes current quick that feedback current is caused avoids motor feedback currents to cause the motor direction current quick that error action of device is done.
Background technology
General motor current fast tripping protection is for the stator winding of motor and the phase fault of lead-out wire thereof, and installing is protection accordingly.The motor that 2MW is following, the installing current quick.2MW and above motor, or the following but current quick sensitivity coefficient of 2MW is when undesirable, the installing longitudinal differential protection.Current quick is provided with high and low two definite values for taking into account sensitivity.High-set setting should escape the maximum starting current of motor.The maximum self-starting electric current of motor when low definite value should escape the recovery of Removal of external faults voltage, the maximum feedback electric current that motor is outwards confessed in the time of also should escaping outside three phase short circuit fault.The situation of misoperation can often occur in current quick because the characteristic difference of dissimilar motor is larger, moreover the operational mode of electric power system also change, the expection feedback current of every motor of accurate Calculation is extremely loaded down with trivial details work.Therefore, in the current quick in the adjusting of low definite value element the empirical values that adopt more determine.When breaking down in the electric power system of motor outside, the feedback current that motor is outwards confessed may cause the action of low definite value element, causes the motor of normal operation to be excised by mistake.This fault should be excised by corresponding protective device action.Because motor feedback currents causes low definite value element malfunction, thereby cause the mistrip of motor switch, can badly influence the operation of equipment or system, cause unnecessary economic loss.
Summary of the invention
The purpose of this utility model provides a kind of motor direction current quick, overcomes the defective that prior art exists, and eliminates the protective device misoperation that low definite value element causes because of motor feedback currents in the motor current fast tripping protection.
The utility model purpose is achieved in that the motor direction current quick comprises that high-set setting element, low definite value element, power directional element, logical AND concern that element, logic OR concern that element, exit relay form.The current signal access high-set setting element of motor, low definite value element and power directional element, while voltage signal access power direction component, when phase fault occurs in motor in starting process, when electric current reaches adjusting of high-set setting element, the action of high-set setting element, after logic OR concerns element, start exit relay, remove to carry out circuit breaker trip.When motor normally moves, behind the burst phase fault, the low definite value element action that sensitivity is higher, power directional element detects and is positive direction, satisfy the conditional request that logical AND concerns element, after logic OR concerns element and exit relay corresponding circuit, start circuit breaker trip.When certain point in the electric power system breaks down; the feedback current of service meter is by high-set setting element, low definite value element and power directional element; feedback current can be greater than the setting value for low definite value element; it is reverse that power directional element detects power direction, and logical AND concerns element latch-up protection loop.
The beneficial effects of the utility model are: set up the power direction blocking element at protective device.This element only has action when power is flowed out by bus, and is failure to actuate when power direction flows to bus, thereby makes the action of relaying protection have certain directivity.By increasing power directional element, make current quick upgrade to the motor direction current quick, eliminated the misoperation that is caused by feedback current.
Description of drawings
Fig. 1 is structural representation of the present utility model.1 is that high-set setting element, 2 is that power directional element, 4 is exit relay for logical AND concerns element, 5 for logic OR concerns element, 6 for hanging down definite value element, 3 among the figure.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing; The motor direction current quick comprises that high-set setting element (1), low definite value element (2), power directional element (3), logical AND concern that element (4), logic OR concern that element (5), exit relay (6) form.The current signal access high-set setting element (1) of motor, low definite value element (2) and power directional element (3), while voltage signal access power direction component (3), when phase fault occurs in motor in starting process, when electric current reaches adjusting of high-set setting element (1), high-set setting element (1) action, after logic OR concerns element (5), start exit relay (6), remove to carry out circuit breaker trip.When motor normally moves, behind the burst phase fault, low definite value element (2) action that sensitivity is higher, power directional element (3) detects and is positive direction, satisfy the conditional request that logical AND concerns element (4), concern the corresponding circuits such as element (5) and exit relay (6) through logic OR after, start circuit breaker trip.When certain point in the electric power system breaks down; the feedback current of service meter is by high-set setting element (1), low definite value element (2) and power directional element (3); feedback current can be greater than the setting value for low definite value element (2); it is reverse that power directional element (3) detects power direction; logical AND concerns element (4) latch-up protection loop, prevents the circuit breaker mistrip.
The utility model is by increasing power directional element, and further perfect motor current fast tripping protection has solved the fast tripping protection misoperation problem that feedback current causes in the electronic protection, has realized that current quick is reliable, correct operation.
Claims (3)
1. motor direction current quick; comprise high-set setting element (1); low definite value element (2); power directional element (3); logical AND concerns element (4); logic OR concerns element (5); exit relay (6) forms; the current signal access high-set setting element (1) that it is characterized in that motor; low definite value element (2) and power directional element (3); while voltage signal access power direction component (3); when electric current reaches adjusting of high-set setting element (1); high-set setting element (1) action; after logic OR concerns element (5), start exit relay (6).
2. a kind of motor direction current quick according to claim 1; it is characterized in that low definite value element (2) action; power directional element (3) detects and is positive direction; satisfy logical AND and concern element (4), concern element (5) and exit relay (6) corresponding circuit through logic OR.
3. a kind of motor direction current quick according to claim 1; it is characterized in that the feedback current of service meter is by high-set setting element (1), low definite value element (2) and power directional element (3); feedback current is the setting value of low definite value element (2); it is reverse that power directional element (3) detects power direction, and logical AND concerns element (4) latch-up protection loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220468243 CN202888806U (en) | 2012-09-06 | 2012-09-06 | Motor directivity current quick-break protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220468243 CN202888806U (en) | 2012-09-06 | 2012-09-06 | Motor directivity current quick-break protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202888806U true CN202888806U (en) | 2013-04-17 |
Family
ID=48080196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220468243 Expired - Fee Related CN202888806U (en) | 2012-09-06 | 2012-09-06 | Motor directivity current quick-break protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202888806U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098736A (en) * | 2014-05-07 | 2015-11-25 | 中国石油化工股份有限公司 | Buscouple protection method with outgoing line reactor |
| CN110311362A (en) * | 2019-07-24 | 2019-10-08 | 齐鲁工业大学 | Multiterminal enclosed type direction pilot protection method and device for transmission and distribution networks |
| CN116231589A (en) * | 2022-11-28 | 2023-06-06 | 云南电网有限责任公司昆明供电局 | Current quick-break protection method without matching with motor starting current |
-
2012
- 2012-09-06 CN CN 201220468243 patent/CN202888806U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098736A (en) * | 2014-05-07 | 2015-11-25 | 中国石油化工股份有限公司 | Buscouple protection method with outgoing line reactor |
| CN105098736B (en) * | 2014-05-07 | 2017-10-20 | 中国石油化工股份有限公司 | A kind of mother guard method with outlet reactor |
| CN110311362A (en) * | 2019-07-24 | 2019-10-08 | 齐鲁工业大学 | Multiterminal enclosed type direction pilot protection method and device for transmission and distribution networks |
| CN116231589A (en) * | 2022-11-28 | 2023-06-06 | 云南电网有限责任公司昆明供电局 | Current quick-break protection method without matching with motor starting current |
| CN116231589B (en) * | 2022-11-28 | 2023-09-29 | 云南电网有限责任公司昆明供电局 | Current quick-break protection method without matching with motor starting current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20130906 |