CN105655979A - Device capable of distinguishing overcurrent and overload protection action signals of high-voltage motor and method - Google Patents
Device capable of distinguishing overcurrent and overload protection action signals of high-voltage motor and method Download PDFInfo
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- CN105655979A CN105655979A CN201610145608.2A CN201610145608A CN105655979A CN 105655979 A CN105655979 A CN 105655979A CN 201610145608 A CN201610145608 A CN 201610145608A CN 105655979 A CN105655979 A CN 105655979A
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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
- H02H7/08—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 dynamo-electric motors
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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
- H02H7/08—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 dynamo-electric motors
- H02H7/085—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 dynamo-electric motors against excessive load
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Abstract
The invention provides a device capable of distinguishing overcurrent and overload protection action signals of a high-voltage motor and a method. According to the main technical scheme, a normally closed shutting contact for overload protection is additionally arranged in a logic loop for overcurrent protection; a series mode of normally open contacts of three overcurrent relays is adopted, the middle relay 2KM is directly started, a normally closed contact of the middle relay is used for shutting an overcurrent protection loop, and a normally open contact of the middle relay is used for starting a delay time relay 2KT loop for overload protection; switching is conducted on overload protection and a connecting piece LP through the signal relay 3KS, and two functions that overload protection acts on tripping, and only signals are sent while tripping does not occur can be achieved. Due to the fact that the action alarm signals for overcurrent protection and overload protection can be distinguished very clearly, consistency of overload protection is enhanced, and selectivity of overcurrent protection and overload protection can be stronger and clearer.
Description
Technical field
The invention belongs to field of relay protection in power, it is specifically related to a kind of can clearly differentiate high-voltage motor overcurrent and the simple and easy method of overload protection act guard signal.
Background technology
High-voltage motor is electric installation important in industrial enterprise, is also the main driving equipment of explained hereafter device. Due to multiple reason, all likely there are the faults such as the short circuit of three phase short circuit, two-phase and ground short circuit in production run process in the stator winding coil of the distribution cable of high-voltage motor or electric motor itself, and the stator winding coil of electric motor also likely there will be shorted-turn fault. If production technique load changes or other factors, the abnormal operating condition such as overload or overload of electric motor also can be caused.
Once certain above-mentioned short trouble occurs in electric motor, the operation of electric motor gently then can be affected, heavy then the winding coil of electric motor will be burnt out, also power supply system can be caused short-circuit impact. If long-time running overload occurs in electric motor, the serious heating of electric motor winding also can be caused even to make the coil insulation punch through damage of electric motor winding.
In order to prevent electric motor from the impact that electric motor is caused by above-mentioned fault or abnormal running status occurring; usually to be prevented the current quick-breaking of alternate short circuit or three phase short circuit from protecting high-voltage motor installing; installing prevents the overcurrent protection of stator winding inter-turn short circuit, also to be installed the ground protection preventing one-phase short-circuit current and overload protection etc. If there is any one in three kinds of short circuits, the protection of its correspondence, just by automatic for the isolating switch of electric motor tripping, is cut off the electricity supply, and is sent corresponding guard signal. Abnormal conditions if there is overload generally can send guard signal, and serious overload also can by automatic for the isolating switch of electric motor tripping.
Existing HV motor protection technology mainly contains three kinds of modes, and first kind of way is provided with three-phase no-time-delay instantaneous current protection, three facies tract time limit overcurrent protections, the overload protection of single-phase zone time limit, band time limit ground protection and band time under-voltage protection etc. 2nd kind of mode and the first is similar, does not just arrange the overload protection in single-phase zone time limit. These two kinds of forms are all the protected modes adopting specified time. The third is the protected mode adopting inverse time limit, is characterized in that the action current of rly. is more big, and opening time is more short, otherwise more long. This method adopts a reverse time limiting current relay both can realize current quick-breaking protection, it is also possible to realize overcurrent protection. This kind of protection is simple, and cost is low.
The wiring scheme that the first electric motor side wiring scheme with the 2nd kind of protected mode and protection secondary side exchange measuring circuit is as shown in Figure 1. Wherein Fig. 1 (a) is the distribution wiring scheme of an electric motor side, Fig. 1 (b) be secondary side current quick-break with overcurrent protection exchange measuring circuit wiring scheme, Fig. 1 (c) is the exchange measuring circuit wiring scheme of secondary side ground protection.
In Fig. 1 (b); TAa, TAb, TAc are the Current Transformer Secondary coil of electric motor distribution leading-out terminal A, B, C three-phase respectively; 1KA, 3KA, 5KA are the current relay for monitoring quick-break protection respectively; 2KA, 4KA, 6KA are the current relay for monitoring overcurrent protection respectively, and 7KA is the current relay for monitoring overload protection. In Fig. 1 (c), TA0Being zero sequence current mutual inductance device two secondary coil of electric motor distribution cable, 8KA is the zero sequence current relay for monitoring grounding protection.
The second outspread figure of the first protected mode is as shown in Figure 2. The contact parallel connection of often opening of tri-rly.s of 1KA, 3KA, the 5KA in figure forms the entrance that current quick-breaking relay protective scheme judges loop; the not free time delay of quick-break protection; directly act on protection exit relay K M or directly action in tripping operation, and sent the guard signal of quick-break protection act tripping operation by 1KS signal relay. The entrance often opening contact parallel connection formation overcurrent protection Logic judgment loop of 2KA, 4KA, 6KA tri-rly.s; overcurrent protection is with time delays; arrive when the time of adjusting one of time relay 1KT; will starting tripping loop by the isolating switch tripping of electric motor, and by 2KS signal relay send overcurrent protection action tripping operation guard signal. The contact of often opening of 7KA rly. is the entrance that overload relay protective scheme judges loop; overload is protected with time delays; arrive when the time of adjusting one of time relay 2KT, sent the guard signal of overload protection act by 3KS signal relay, but isolating switch does not trip.
In fig. 2,8KA rly. often open the entrance that contact is ground protection Logic judgment loop, ground protection, with time delays, arrives when the time of adjusting one of time relay 3KT, by 4KS signal relay send ground protection action tripping operation guard signal. KV be from bus PT three-phase under-voltage protection action outlet rly. often open contact; as the entrance in under-voltage protection Logic judgment loop; under-voltage protection is with time delays; arrive when the time of adjusting one of time relay 4KT, sent the guard signal of under-voltage protection action tripping operation by 5KS signal relay.
The second outspread figure of the 2nd kind of protected mode is as shown in figure 3. In figure 3, the first the protection situation shown in the operating principle of current quick-breaking protection, overcurrent protection, ground protection and under-voltage protection and Fig. 2 is similar, but, it does not arrange any overload protection. This is also the relaying configuration mode that a lot of high-voltage motor is conventional.
In the first protected mode, although there being the different configurations that overcurrent and overload are protected, and, generally, they can both according to the respective correct action of protection function. But; when there is suddenly serious overload in the processing unit of production equipment; because of a time-delay action time limit differential �� t longer than overcurrent protection of overload protection; differ correct action surely; but make the circuit breaker trip of electric motor by the leading action of overcurrent protection, and the corresponding action guard signal sending overcurrent protection. Once send such protection act signal; nature can allow people think, and have there is short trouble in the distribution unit of electric motor or the inside winding of electric motor; corresponding with regard to having misled technique and electric personnel, the focus checking fault is placed in the inspection to electric motor distribution section, and really ignores the inspection to production process equipment. And the fact is, occur that overload causes because of production technique, it is not the distribution section problem of electric motor. So, protection sends such misleading actuating signal and not only can incur loss through delay the time fixed a breakdown, but also expands the loss of power outage. Obviously, this kind of protection guard signal can not clearly differentiate overcurrent and overload protection act characteristic, mistake that yes.
2nd kind of protected mode does not just configure overload protection originally, no matter is the short trouble of electric motor winding inter-turn or serious overload, all in tripping and sends the guard signal of overcurrent by overcurrent protection action. It is short trouble or overload on earth that such guard signal not can be differentiated, once there be overcurrent trip actuating signal to occur, the problem of all can be summed up in the point that on electric installation, electric motor must be carried out comprehensive Checking and diagnosis, and such inspection work at least wants several hours consuming time. If being really the tripping fault that production technique overload causes, that does not just have any relation with electric motor distribution section, check that electric motor distribution unit is exactly lose time in vain, its result is also ignore the inspection to production technique, finally equally delay the time fixed a breakdown, expand the loss of power outage. So, this kind of protection guard signal can not clearly differentiate overcurrent and overload protection too, is also defective certainly.
Configure scheme as the third protected mode, the existing quick-break action of the implication of its protection act signal, have an overcurrent action again, also have overload action, be what fault actions actually, basic for the moment differentiate unclear, be exactly a muddled account completely.
It thus is seen that existing high-voltage motor three kinds of protected modes, when overload really occurs, owing to can not clearly differentiate overcurrent and overload signal, thus delay the time of correct looking up the fault, expand the loss of power outage.
Summary of the invention
For existing protection technology Problems existing; the present invention proposes a kind of can clearly differentiate high-voltage motor overcurrent and overload protection report to the police simple and easy method; this kind of method is a kind of improvement and bring new ideas in existing protection technology; its performance to be far better than existing protection technology; can tell to clear and definite the overcurrent protection act signal different from overload two kinds completely, meet the selectivity requirement of relaying.
The present invention realizes by the following technical solutions: a kind of can clearly differentiate high-voltage motor overcurrent and the device of overload protection act signal, and it comprises direct current protecting power supply and the quick-break protective loop being connected in parallel on protection power source, locking overcurrent protection loop, overload protective loop; Described quick-break protective loop comprises that the first over current relay 1KA often opens contact, the 3rd over current relay 3KA often opens contact and the 5th over current relay 5KA often opens contact, the first signal relay 1KS coil, the first intermediate relay 1KM coil; Described first over current relay 1KA often opens contact, the 3rd over current relay 3KA often opens contact, the 5th over current relay 5KA often opens contact parallel connection; Described first over current relay 1KA often opens contact one termination protection power source positive pole, another termination first signal relay 1KS coil one end; Another termination first intermediate relay 1KM coil one end of first signal relay 1KS coil; Another termination protection power source negative pole of first intermediate relay 1KM coil; Described locking overcurrent protection loop comprises that the 2nd over current relay 2KA mono-often opens contact, the 4th over current relay 4KA mono-often opens contact, the 6th over current relay 6KA mono-often opens contact, the time closing of the 2nd normally closed contact of intermediate relay 2KM, the first time delay relay 1KT coil, the first timing relay 1KT often open contact and second signal rly. 2KS coil; Described 2nd over current relay 2KA mono-often opens contact, the 4th over current relay 4KA mono-often opens contact, the 6th over current relay 6KA mono-often opens contact parallel connection; Described 2nd over current relay 2KA mono-often opens contact one termination positive source, the normally closed contact one end of another termination the 2nd intermediate relay 2KM; Another termination first time delay relay 1KT coil one end of the 2nd normally closed contact of intermediate relay 2KM; Another termination protection power source negative pole of first time delay relay 1KT coil; The positive pole often opening contact one termination protection power source of the time closing of the first time delay relay 1KT, one end of another termination second signal rly. 2KS coil; Another termination first signal relay 1KS coil the other end of second signal rly. 2KS coil;
Described overload protective loop comprise the 2nd over current relay 2KA another often open contact, the 4th over current relay 4KA another often open contact, the 6th over current relay 6KA another often open contact, the 2nd intermediate relay 2KM coil, the 2nd intermediate relay 2KM often open contact, contact, the 3rd signal relay 3KS coil, connection piece LP and current limliting resistance R are often opened in the 2nd time delay relay 2KT coil, the 2nd timing relay 2KT time closing; Described 2nd over current relay 2KA another often open contact, the 4th over current relay 4KA another often open contact, the 6th over current relay 6KA another often open contact and be sequentially connected in series; 2nd over current relay 2KA another often open contact one termination protection power source positive pole; 6th over current relay 6KA another often open another termination of contact the 2nd intermediate relay 2KM coil one end; Another termination protection power source negative pole of 2nd intermediate relay 2KM coil; 2nd intermediate relay 2KM often opens contact one termination protection power source positive pole, another termination the 2nd time delay relay 2KT coil one end; Another termination protection power source negative pole of 2nd time delay relay 2KT coil; Contact one termination protection power source positive pole is often opened in 2nd time delay relay 2KT time closing, another termination the 3rd signal relay 3KS coil one end; 3rd signal relay 3KS coil the other end contact pin LP first end in succession; Connection piece LP the 2nd termination second signal rly. 2KS coil the other end; Connection piece LP the 3rd termination current limliting resistance R one end; Another termination protection power source negative pole of current limliting resistance R.
Further, also comprise ground protection loop; Ground protection loop comprises that zero sequence excess current rly. 7KA often opens contact, contact and the 4th signal relay 4KS coil are often opened in the 3rd time delay relay 3KT coil, the 3rd time delay relay 3KT time closing; Described zero sequence excess current rly. 7KA often opens contact one termination protection power source positive pole, another termination the 3rd time delay relay 3KT coil one end; Another termination protection power source negative pole of 3rd time delay relay 3KT coil; Contact one termination power cathode is often opened in 3rd time delay relay 3KT time closing; Another termination the 4th signal relay 4KS coil one end; The 4th signal relay 4KS coil the other end takes over load protective loop connection piece LP the 2nd end.
Further, also comprise under-voltage protection loop; Under-voltage protection loop comprises the three-phase under-voltage protection outlet relay K V monitored by bus voltage monitoring loop and often opens contact; 4th time delay relay 4KT coil, the 4th time delay relay 4KT time closing often open contact, the 5th signal relay 5KS coil; Described three-phase under-voltage protection outlet relay K V often opens contact one termination protection power source positive pole, another termination the 4th time delay relay 4KT coil one end; Another termination protection power source negative pole of 4th time delay relay 4KT coil; Contact one termination protection power source positive pole is often opened in described 4th time delay relay 4KT time closing, another termination the 5th signal relay 5KS coil one end; 5th signal relay another termination of 5KS coil the 4th signal relay 4KS coil the other end.
The present invention also provides a kind of method based on the above-mentioned device that can differentiate high-voltage motor overcurrent and overload protection act signal, it is characterized in that: if the abnormal operating condition of overload has occurred in electric motor, when its current value meets and exceeds the action setting valve of overcurrent or overload rly., 2KA, 4KA, 6KA in locking overcurrent protection loop tri-over current relays all can action, 2KA, 4KA, 6KA tri-parallel connections often open contact close; 2KA, 4KA, 6KA in overload protective loop tri-series connection is often held contact and also can be closed, and start the 2nd intermediate relay 2KM instantaneously, and the 2nd normally closed contact of intermediate relay 2KM being connected in overcurrent protection loop is instantaneous opens, cut off the delay start-off of overcurrent protection; First time delay relay 1KT can not restart, thus serves the locking effect to overcurrent protection; And the 2nd intermediate relay 2KM often hold the 2nd time delay relay 2KT that contact can start overload protective loop immediately, arrive when the time delay time one of the 2nd time delay relay 2KT, if connection piece LP is connected to tripping operation loop, electric motor will trip because of serious overload, and sent the guard signal of overload tripping operation by the 3rd signal relay 3KS; If connection piece LP is connected to the signal loop of band current limiting resistance R, electric motor then need not trip, and only sends the guard signal of overload by the 3rd signal relay 3KS; If self has there is fault in electric motor distribution unit inside, cause and it is short-circuited or is short-circuited between two-phase between same phase winding circle, 2KA, 4KA, 6KA tri-over current relays must have one or two meeting actions, but there will not be the situation of three all actions, namely three in overload protective loop often open contact and can not close together, 2nd intermediate relay 2KM can not start, namely the 2nd normally closed contact of intermediate relay 2KM in overcurrent protection loop also would not be opened, thus starts the first time delay relay 1KT of overcurrent protection; Arriving when the time delay time one of the first time delay relay 1KT, electric motor will trip because of overcurrent fault, and sent the guard signal of overcurrent trip by second signal rly. 2KS; When electric motor three phase short circuit fault, short-circuit current exceedes the electric current of adjusting of current quick-breaking protective loop, and the first over current relay 1KA, the 3rd over current relay 3KA, the 5th over current relay 5KA all can actions; First over current relay 1KA often opens contact, the 3rd over current relay 3KA often opens contact and the 5th over current relay 5KA often to open contact all closed; and start the first intermediate relay 1KM instantaneously; electric motor will trip because of serious overcurrent fault, and sent the guard signal of quick-break protection act tripping operation by the first signal relay 1KS.
Further, when electric motor generation ground fault, its current value meets and exceeds the setting valve of zero sequence excess current rly. 7KA, and zero sequence excess current rly. 7KA often opens contact and closes, and starts the 3rd time delay relay 3KT; Arriving when the time of adjusting one of the 3rd time delay relay 3KT, electric motor will trip because of ground fault, and sent the guard signal of ground protection action tripping operation by the 4th signal relay 4KS.
Further, when bus voltage monitoring loop monitors three-phase low voltage, its protection exit relay K V often opens contact and closes, and starts the 4th time delay relay 4KT; Arriving when the time of adjusting one of the 4th time delay relay 4KT, electric motor will trip because of under-voltage protection action, and sent the guard signal of under-voltage protection action tripping operation by the 5th signal relay 5KS.
Compared with prior art, the action guard signal of overcurrent and overload two kinds of different protections is differentiated fully aware of by the present invention, mainly overcurrent protection loop is taken the locking measure of overload, turn increase the overload protection pattern of independent three-phase series simultaneously, enhance overload protection consistence, thus make two kinds of selectivity protected more by force, clearer and more definite; Electric motor has had clear and definite protection act guard signal, also would not production technique personnel and electric personnel be misled, and also would not incur loss through delay the time of investigation fault, also can race against time for fixing a breakdown, for enterprise reduces the loss; There is clear and definite protection act guard signal, also can reduce disputing over trifles and shifting responsibility onto others between technique, instrument and electric different majors, reduce the friction between specialty, it is to increase working efficiency.
Accompanying drawing explanation
Fig. 1 is electric motor side distribution wiring scheme and secondary side exchange measuring circuit wiring scheme.
Fig. 2 is the second outspread figure with overload protection.
Fig. 3 is the second outspread figure without overload protection.
Fig. 4 is that the present invention can clearly differentiate overcurrent and the second outspread figure of overload protection guard signal.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
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Further, also comprise ground protection loop; Ground protection loop comprises that zero sequence excess current rly. 7KA often opens contact, contact and the 4th signal relay 4KS coil are often opened in the 3rd time delay relay 3KT coil, the 3rd time delay relay 3KT time closing; Described zero sequence excess current rly. 7KA often opens contact one termination protection power source positive pole, another termination the 3rd time delay relay 3KT coil one end; Another termination protection power source negative pole of 3rd time delay relay 3KT coil; Contact one termination protection power source negative pole is often opened in 3rd time delay relay 3KT time closing; Another termination the 4th signal relay 4KS coil one end; The 4th signal relay 4KS coil the other end takes over load protective loop connection piece LP the 2nd end.
Further, also comprise under-voltage protection loop; Under-voltage protection loop comprises the three-phase under-voltage protection outlet relay K V monitored by bus voltage monitoring loop and often opens contact; 4th time delay relay 4KT coil, the 4th time delay relay 4KT time closing often open contact, the 5th signal relay 5KS coil; Described three-phase under-voltage protection outlet relay K V often opens contact one termination protection power source positive pole, another termination the 4th time delay relay 4KT coil one end; Another termination protection power source negative pole of 4th time delay relay 4KT coil; Contact one termination protection power source positive pole is often opened in described 4th time delay relay 4KT time closing, another termination the 5th signal relay 5KS coil one end; 5th signal relay another termination of 5KS coil the 4th signal relay 4KS coil the other end.
The present invention also provides a kind of can differentiate high-voltage motor overcurrent and the method for overload protection act signal based on above-mentioned, if has there is the abnormal operating condition of overload in electric motor, when its current value meets and exceeds the action setting valve of overcurrent or overload rly., 2KA, 4KA, 6KA in locking overcurrent protection loop tri-over current relays all can action, 2KA, 4KA, 6KA tri-parallel connections often open contact close; 2KA, 4KA, 6KA in overload protective loop tri-series connection is often held contact and also can be closed, and start the 2nd intermediate relay 2KM instantaneously, and the 2nd normally closed contact of intermediate relay 2KM being connected in overcurrent protection loop is instantaneous opens, cut off the delay start-off of overcurrent protection; First time delay relay 1KT can not restart, thus serves the locking effect to overcurrent protection; And the 2nd intermediate relay 2KM often hold the 2nd time delay relay 2KT that contact can start overload protective loop immediately, arrive when the time delay time one of the 2nd time delay relay 2KT, if connection piece LP is connected to tripping operation loop, electric motor will trip because of serious overload, and sent the guard signal of overload tripping operation by the 3rd signal relay 3KS; If connection piece LP is connected to the signal loop of band current limiting resistance R, electric motor then need not trip, and only sends the guard signal of overload by the 3rd signal relay 3KS; If self has there is fault in electric motor distribution unit inside, cause and it is short-circuited or is short-circuited between two-phase between same phase winding circle, 2KA, 4KA, 6KA tri-over current relays must have one or two meeting actions, but there will not be the situation of three all actions, namely three in overload protective loop often open contact and can not close together, 2nd intermediate relay 2KM can not start, namely the 2nd normally closed contact of intermediate relay 2KM in overcurrent protection loop also would not be opened, thus starts the first time delay relay 1KT of overcurrent protection; Arriving when the time delay time one of the first time delay relay 1KT, electric motor will trip because of overcurrent fault, and sent the guard signal of overcurrent trip by second signal rly. 2KS; When electric motor three phase short circuit fault, short-circuit current exceedes the electric current of adjusting of current quick-breaking protective loop, and the first over current relay 1KA, the 3rd over current relay 3KA, the 5th over current relay 5KA all can actions; First over current relay 1KA often opens contact, the 3rd over current relay 3KA often opens contact and the 5th over current relay 5KA often to open contact all closed; and start the first intermediate relay 1KM instantaneously; electric motor will trip because of serious overcurrent fault, and sent the guard signal of quick-break protection act tripping operation by the first signal relay 1KS.
Further, when electric motor generation ground fault, its current value meets and exceeds the setting valve of zero sequence excess current rly. 7KA, and zero sequence excess current rly. 7KA often opens contact and closes, and starts the 3rd time delay relay 3KT; Arriving when the time of adjusting one of the 3rd time delay relay 3KT, electric motor will trip because of ground fault, and sent the guard signal of ground protection action tripping operation by the 4th signal relay 4KS.
Further, when bus voltage monitoring loop monitors three-phase low voltage, its protection exit relay K V often opens contact and closes, and starts the 4th time delay relay 4KT; Arriving when the time of adjusting one of the 4th time delay relay 4KT, electric motor will trip because of under-voltage protection action, and sent the guard signal of under-voltage protection action tripping operation by the 5th signal relay 5KS.
The core technology of the present invention comprises:
(1) in the logic loop of overcurrent protection, add the normally closed locking contact of an overload protection;
(2) have employed the series system that contact often opened by three over current relays, and directly start an intermediate relay 2KM, remove locking overcurrent protective loop by the normally closed contact of this intermediate relay, and go to, by the contact of often opening of this intermediate relay, the time delay relay 2KT loop starting overload protection;
(3) overload protection switches through signal relay 3KS and connection piece LP, both can realize overload protection act in tripping operation, it is also possible to realize not tripping two kinds of different functions such as only signalling.
The current quick-breaking protection of high-voltage motor is snap action, not band time delay, and overcurrent and overload protection are all free time delays. in the diagram, if has there is the abnormal operating condition of overload in electric motor, when its current value meets and exceeds the action setting valve of overcurrent or overload rly., 2KA, 4KA, 6KA tri-over current relays all can action, three parallel connections in overcurrent protection loop are often held contact and all can be closed, three series connection in overload protective loop are often held contact and also can be closed together, and start intermediate relay 2KM instantaneously, and the normally closed contact of the 2KM being connected in overcurrent protection loop is instantaneous opens, cut off the delay start-off of overcurrent protection, time delay relay 1KT can not restart, thus serve the locking effect to overcurrent protection. and 2KM intermediate relay often hold contact can start immediately overload protection time delay relay 2KT. arriving when the time delay time one of 2KT, if connection piece LP is connected to tripping operation loop, electric motor will trip because of serious overload, and sent the guard signal of overload tripping operation by 3KS signal relay, if connection piece LP is connected to the signal loop of band current limiting resistance R, electric motor then need not trip, and only sends the guard signal of overload by 3KS rly..
If self has there is fault in electric motor distribution unit inside, cause and it is short-circuited or is short-circuited between two-phase between same phase winding circle, so, 2KA, 4KA, 6KA tri-over current relays must have one or two can action, but there will not be the situation of three all actions. So, three in overload loop often open contact and can not close together, dead end, and 2KM intermediate relay can not start, and the normally closed contact of the 2KM in overcurrent protection loop also would not be opened. Therefore, in overcurrent protection loop, contact whether closed or closed two is often opened in three parallel connections, all can start the time delay relay 1KT of overcurrent protection. Arriving when the time delay time one of 1KT, electric motor will trip because of overcurrent fault, and sent the guard signal of overcurrent trip by 2KS signal relay.
High-voltage motor overload is completely different from the phenomenon of alternate short circuit and same phase winding shorted-turn fault. Overload majority is caused by production technique, and alternate short circuit or same phase winding turn-to-turn short circuit are caused by motor interior fault. When there is overload, the tri-phase current of electric motor is symmetrical, and amplitude is roughly equal, and just the rated current of current value ratio normal load electric current or electric motor is larger, and electric motor itself is fault not. If being short-circuited between fault or two-phase between same phase winding circle to be short-circuited fault, the tri-phase current amplitude of electric motor is inequal, and a phase or two phase currents must be had to increase. And, has there is fault in electric motor itself. This illustrates, the fault that is short-circuited between fault or two-phase between electric motor same phase winding circle to be short-circuited is completely different from overload situation, and this is and the significant difference of overload situation be also exactly the important evidence of formation the present invention.
The action guard signal of high-voltage motor overcurrent and overload two kinds of different protections is differentiated fully aware of by the present invention; mainly overcurrent protection loop is taken the locking measure of overload; turn increase the overload protection pattern of independent three-phase series simultaneously; enhance the consistence of overload protection; thus make two kinds of selectivity protected more by force, clearer and more definite; this is and the existing complete difference of protection technology, is also the important technical advantage of this motion. Electric motor has had clear and definite protection act guard signal, also would not production technique personnel and electrical operation personnel be misled, and also would not incur loss through delay the time of investigation fault, also can race against time for fixing a breakdown, for enterprise reduces the loss. There is clear and definite protection act guard signal, also can reduce disputing over trifles and shifting responsibility onto others between production technique, instrument control and electrical operation different majors, reduce the friction between specialty, it is to increase working efficiency.
The technical scheme that the present invention proposes except taking technical measures as shown in Figure 4 in steering logic; hardware have also been made simplification; eliminate the rly. 7KA of original overload protection in Fig. 1 (b); the rly. serial number that zero sequence excess current in Fig. 1 (c) is protected is changed into 7KA by 8KA; and both monitoring rly.s that the monitoring rly. of overcurrent protection and overload are protected are unified mutually; as shown in Figure 4; it is 2KA, 4KA and 6KA; but, it is desired to these three rly.s must have the double contact over current relay that two are often opened contact. In addition, protection act setting valve have also been made some adjustment. On the adjusting of this three over current relay action currents, overcurrent and both overloads being unified mutually, one-off electric current of its protection is all adjusted according to the electric motor rated current of 1.1 times of hiding. The action time limit of overcurrent protection adjusted according to the start time avoiding electric motor, and the action time limit of overload protection adjusts according to than limit for length �� t during the action of overcurrent protection.
It it is more than the better embodiment of the present invention; this specific embodiment can be made various amendment under the prerequisite of the principle and essence of not running counter to the present invention or supplements or adopt similar mode to substitute by those skilled in the art, but these changes all fall into protection scope of the present invention. Therefore the technology of the present invention scope is not limited to above-described embodiment.
Claims (6)
1. can differentiate high-voltage motor overcurrent and the device of overload protection act signal for one kind, it is characterised in that: comprise direct current protecting power supply and the quick-break protective loop being connected in parallel on protection power source, locking overcurrent protection loop, overload protective loop;
Described quick-break protective loop comprises that the first over current relay 1KA often opens contact, the 3rd over current relay 3KA often opens contact and the 5th over current relay 5KA often opens contact, the first signal relay 1KS coil, the first intermediate relay 1KM coil; Described first over current relay 1KA often opens contact, the 3rd over current relay 3KA often opens contact, the 5th over current relay 5KA often opens contact parallel connection; Described first over current relay 1KA often opens contact one termination protection power source positive pole, another termination first signal relay 1KS coil one end; Another termination first intermediate relay 1KM coil one end of first signal relay 1KS coil; Another termination protection power source negative pole of first intermediate relay 1KM coil;
Described locking overcurrent protection loop comprises that the 2nd over current relay 2KA mono-often opens contact, the 4th over current relay 4KA mono-often opens contact, the 6th over current relay 6KA mono-often opens contact, the time closing of the 2nd normally closed contact of intermediate relay 2KM, the first time delay relay 1KT coil, the first time delay relay 1KT often open contact and second signal rly. 2KS coil; Described 2nd over current relay 2KA mono-often opens contact, the 4th over current relay 4KA mono-often opens contact, the 6th over current relay 6KA mono-often opens contact parallel connection; Described 2nd over current relay 2KA mono-often opens contact one termination positive source, the normally closed contact one end of another termination the 2nd intermediate relay 2KM; Another termination first time delay relay 1KT coil one end of the 2nd normally closed contact of intermediate relay 2KM; Another termination protection power source negative pole of first time delay relay 1KT coil; The positive pole often opening contact one termination protection power source of the time closing of the first time delay relay 1KT, one end of another termination second signal rly. 2KS coil; Another termination first signal relay 1KS coil the other end of second signal rly. 2KS coil;
Described overload protective loop comprise the 2nd over current relay 2KA another often open contact, the 4th over current relay 4KA another often open contact, the 6th over current relay 6KA another often open contact, the 2nd intermediate relay 2KM coil, the 2nd intermediate relay 2KM often open contact, contact, the 3rd signal relay 3KS coil, connection piece LP and current limliting resistance R are often opened in the 2nd timing relay 2KT coil, the 2nd time delay relay 2KT time closing; Described 2nd over current relay 2KA another often open contact, the 4th over current relay 4KA another often open contact, the 6th over current relay 6KA another often open contact and be sequentially connected in series; 2nd over current relay 2KA another often open contact one termination protection power source positive pole; 6th over current relay 6KA another often open another termination of contact the 2nd intermediate relay 2KM coil one end; Another termination protection power source negative pole of 2nd intermediate relay 2KM coil; 2nd intermediate relay 2KM often opens contact one termination protection power source positive pole, another termination the 2nd time delay relay 2KT coil one end; Another termination protection power source negative pole of 2nd time delay relay 2KT coil; Contact one termination protection power source positive pole is often opened in 2nd time delay relay 2KT time closing, another termination the 3rd signal relay 3KS coil one end; 3rd signal relay 3KS coil the other end contact pin LP first end in succession; Connection piece LP the 2nd termination second signal rly. 2KS coil the other end; Connection piece LP the 3rd termination current limliting resistance R one end; Another termination protection power source negative pole of current limliting resistance R.
2. according to claim 1 can differentiate high-voltage motor overcurrent and the device of overload protection act signal, it is characterised in that: also comprise ground protection loop; Ground protection loop comprises that zero sequence excess current rly. 7KA often opens contact, contact and the 4th signal relay 4KS coil are often opened in the 3rd time delay relay 3KT coil, the 3rd time delay relay 3KT time closing; Described zero sequence excess current rly. 7KA often opens contact one termination protection power source positive pole, another termination the 3rd time delay relay 3KT coil one end; Another termination protection power source negative pole of 3rd time delay relay 3KT coil; The positive pole often opening contact one termination protection power source of the 3rd time delay relay 3KT time closing, another termination the 4th signal relay 4KS coil one end, the 4th signal relay 4KS coil the other end takes over load protective loop connection piece LP the 2nd end.
3. according to claim 1 can differentiate high-voltage motor overcurrent and the device of overload protection act signal, it is characterised in that: also comprise under-voltage protection loop; Under-voltage protection loop comprises that the three-phase under-voltage protection outlet relay K V monitored by bus voltage monitoring loop often opens contact, contact, the 5th signal relay 5KS coil are often opened in the 4th time delay relay 4KT coil, the 4th time delay relay 4KT time closing; Described three-phase under-voltage protection outlet relay K V often opens contact one termination protection power source positive pole, another termination the 4th time delay relay 4KT coil one end; Another termination protection power source negative pole of 4th time delay relay 4KT coil; Contact one termination protection power source positive pole is often opened in described 4th time delay relay 4KT time closing, another termination the 5th signal relay 5KS coil one end; 5th signal relay another termination of 5KS coil the 4th signal relay 4KS coil the other end.
4. the method based on the device that can differentiate high-voltage motor overcurrent and overload protection act signal according to claim 1, it is characterized in that: if the abnormal operating condition of overload has occurred in electric motor, when its current value meets and exceeds the action setting valve of overcurrent or overload rly., 2KA, 4KA, 6KA in locking overcurrent protection loop tri-over current relays all can action, 2KA, 4KA, 6KA tri-parallel connections often open contact close; 2KA, 4KA, 6KA in overload protective loop tri-series connection is often held contact and also can be closed, and start the 2nd intermediate relay 2KM instantaneously, and the 2nd normally closed contact of intermediate relay 2KM being connected in overcurrent protection loop is instantaneous opens, cut off the delay start-off of overcurrent protection; First time delay relay 1KT can not restart, thus serves the locking effect to overcurrent protection; And the 2nd intermediate relay 2KM often hold the 2nd time delay relay 2KT that contact can start overload protective loop immediately, arrive when the time delay time one of the 2nd time delay relay 2KT, if connection piece LP is connected to tripping operation loop, electric motor will trip because of serious overload, and sent the guard signal of overload tripping operation by the 3rd signal relay 3KS; If connection piece LP is connected to the signal loop of band current limiting resistance R, electric motor then need not trip, and only sends the guard signal of overload by the 3rd signal relay 3KS;
If self has there is fault in electric motor distribution unit inside, cause and it is short-circuited or is short-circuited between two-phase between same phase winding circle, 2KA, 4KA, 6KA tri-over current relays must have one or two meeting actions, but there will not be the situation of three all actions, namely three in overload protective loop often open contact and can not close together, 2nd intermediate relay 2KM can not start, namely the 2nd normally closed contact of intermediate relay 2KM in overcurrent protection loop also would not be opened, thus starts the first time delay relay 1KT of overcurrent protection; Arriving when the time delay time one of the first time delay relay 1KT, electric motor will trip because of overcurrent fault, and sent the guard signal of overcurrent trip by second signal rly. 2KS;
When electric motor three phase short circuit fault, short-circuit current exceedes the electric current of adjusting of current quick-breaking protective loop, and the first over current relay 1KA, the 3rd over current relay 3KA, the 5th over current relay 5KA all can actions; First over current relay 1KA often holds contact, the 3rd over current relay 3KA often holds contact and the 5th over current relay 5KA often holds contact and all can close; and start the first intermediate relay 1KM instantaneously; electric motor will trip because of serious overcurrent fault, and sent the guard signal of quick-break protection act tripping operation by the first signal relay 1KS.
5. according to claim 4 can differentiate high-voltage motor overcurrent and the method for overload protection act signal, it is characterized in that: when electric motor generation ground fault, its current value meets and exceeds the setting valve of zero sequence over current relay 7KA, zero sequence over current relay 7KA often opens contact and closes, and starts the 3rd time delay relay 3KT; Arriving when the time of adjusting one of the 3rd time delay relay 3KT, electric motor will trip because of ground fault, and sent the guard signal of ground protection action tripping operation by the 4th signal relay 4KS.
6. according to claim 4 can differentiate high-voltage motor overcurrent and the method for overload protection act signal, it is characterized in that: when bus voltage monitoring loop monitors three-phase low voltage, its protection exit relay K V often opens contact and closes, and starts the 4th time delay relay 4KT; Arriving when the time of adjusting one of the 4th time delay relay 4KT, electric motor will trip because of under-voltage protection action, and sent the guard signal of under-voltage protection action tripping operation by the 5th signal relay 5KS.
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| CN201610145608.2A CN105655979B (en) | 2016-03-15 | 2016-03-15 | The device and method of high-voltage motor overcurrent and overload protection action signal can be differentiated |
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| CN201610145608.2A CN105655979B (en) | 2016-03-15 | 2016-03-15 | The device and method of high-voltage motor overcurrent and overload protection action signal can be differentiated |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106409088A (en) * | 2016-11-08 | 2017-02-15 | 中国人民解放军95874部队训练处 | High-voltage electrical equipment over current protection training system and training method thereof |
| CN107884665A (en) * | 2017-11-28 | 2018-04-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | Prevent the device and method of generator outlet voltage transformer turn-to-turn short circuit false tripping machine |
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| CN2071401U (en) * | 1990-06-01 | 1991-02-13 | 浙江大学 | High voltage motor control cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106409088A (en) * | 2016-11-08 | 2017-02-15 | 中国人民解放军95874部队训练处 | High-voltage electrical equipment over current protection training system and training method thereof |
| CN107884665A (en) * | 2017-11-28 | 2018-04-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | Prevent the device and method of generator outlet voltage transformer turn-to-turn short circuit false tripping machine |
| CN107884665B (en) * | 2017-11-28 | 2024-03-08 | 大唐西北(西安)电力试验研究院有限公司 | Device and method for preventing turn-to-turn short circuit of generator outlet voltage transformer from mistakenly tripping |
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| CN105655979B (en) | 2018-02-06 |
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