CN105071340A - Power phase failure protection apparatus - Google Patents
Power phase failure protection apparatus Download PDFInfo
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- CN105071340A CN105071340A CN201510472526.4A CN201510472526A CN105071340A CN 105071340 A CN105071340 A CN 105071340A CN 201510472526 A CN201510472526 A CN 201510472526A CN 105071340 A CN105071340 A CN 105071340A
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Abstract
The invention relates to a power phase failure protection apparatus which comprises a three-phase air switch and relays, wherein the relays are three voltage monitoring unit relays and three alarm logic unit relays; one end of a coil of each voltage monitoring unit relay is connected with a neutral terminal, and the other end of the coil of the voltage monitoring unit relay is connected with the three-phase air switch; one end of a coil of each alarm logic unit relay is connected with the neutral terminal, and the other end of the coil of the alarm logic unit relay is connected with the three-phase air switch through normally closed contacts, which are connected in series, of the other two alarm logic unit relays; one end of a normally open contact of the alarm logic unit relay is connected with the other end of the corresponding coil, and the other ends of the normally open contacts of the alarm logic unit relays are connected in parallel; and both ends of the normally closed contacts of the voltage monitoring unit relays are separately connected in parallel, one ends of the normally closed contacts of the voltage monitoring unit relays are connected with a parallel connection point of the normally open contacts of the alarm logic unit relays, connected in series with the normally open contacts of the three voltage monitoring unit relays and connected with a normal indication lamp and a control relay coil which are connected in parallel and grounded, and the other ends of the normally closed contacts of the voltage monitoring unit relays are connected with a fault indication lamp and an alarm which are connected in parallel and grounded. According to the power phase shortage protection apparatus, a power phase failure signal is automatically sent.
Description
Technical field
The present invention relates to the electrical source of power feeding controller in a kind of industrial processes, specifically relate to a kind of protective device of power phase shortage.
Background technology
In modern production process, electric power is as topmost drive energy, how to improve the reliability of power supply supply, improve power quality, thus ensureing that the production equipment of production process runs under the requirement power supply that it is specified, this ensures that electric equipment operation safety and production efficiency continue the basic demand of size.That the reliability of power quality in large industrial enterprise concerns the major issue that life-and-death matter especially simultaneously.
The units such as industrial and mining enterprises (or the unit such as scientific research institution, hospital) require higher to open phases of three-phase power source restriction, and three phase mains electric equipment runs and causes the safe controllability of the course of work to reduce in phase shortage situation.Such as: widely used threephase asynchronous in current industrial and mining enterprises, if occur causing power phase shortage (such as B phase dead electricity) due to external cause at its running, the control apparatus element of motor is just in time selected to be provided by other two-phases (phase) to control power supply (such as A simultaneously, the AC380V power supply that C phase provides or A(C) the AC220V power supply that provides with neutral line N), now, motor can't shut down because of the phase shortage of power supply, but continue to run under control loop normally keeps, but now, the power supply quality of power supply can not meet the operation needs (phase shortage) of motor, then motor running electric current just needs sharply to increase, delayed certain because thermal inertia has of overcurrent relay, motor is then now very likely caused to be burnt because electric current seriously exceedes its specified permission electric current (now the operating current of motor reality is approximately 1.4 times of its rated current), and for example: in the workplace of the frequent use hoisting equipments such as machine shop, if there is the power supply phase shortage of overhead traveling crane, be not only and likely crane motor burnt, also likely occur that the hoisting moment due to overhead traveling crane wherein motor is not enough simultaneously, cause large-scale hanging piece lifting difficulty or glide, now then likely causing hanging piece damage or bottom surface lifting commanding to be subject to personal injury.The protective device of existing power phase shortage; the hoisting equipments such as overhead traveling crane mainly detect the electric power thus supplied of power supply to working equipment by " zero-bit " relay etc.; this checkout gear is as with above-mentioned: can only detect the power supply two-phase that is associated with " zero-bit " relay or a phase whether working properly, and can not accomplish to check one by one the applicability of whole each phase of power supply.
Summary of the invention
In order to overcome the above-mentioned deficiency of the protective device of existing power supply phase shortage, the invention provides a kind of protective device of power phase shortage, this device, when power phase shortage, sends the signal of power phase shortage automatically; Its control relay normally opened contact, is connected in the control loop of three-phase electric equipment, automatic cutting-off controlling loop, disconnects the power supply of three-phase electric equipment, thus guarantees three-phase electric equipment not reason power supply reason and damaged.
The protective device of this power phase shortage comprises three-phase air switch QF1 and relay, and the three-phase of three-phase air switch QF1 side is connected with A phase connection terminal A, B phase connection terminal B, C phase connection terminal C respectively; It is characterized in that:
The three-phase that described relay is voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac, alarming logic unit first relay K A1, alarming logic unit second relay K A2 and alarming logic unit the 3rd continue KA3, three-phase air switch QF1 opposite side respectively connected one end of voltage monitoring unit first relay K Aa coil, voltage monitoring unit second relay KAb coil, voltage monitoring unit the 3rd relay K Ac coil; The other end of voltage monitoring unit first relay K Aa coil, voltage monitoring unit second relay K Ab coil, voltage monitoring unit the 3rd relay K Ac coil is connected with zero line binding post N;
The normally-closed contact of alarming logic unit second relay K A2 and the normally-closed contact of alarming logic unit the 3rd relay K A3 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit first relay K Aa coil; The normally-closed contact of alarming logic unit first relay K A1 and the normally-closed contact of alarming logic unit the 3rd relay K A3 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit second relay K Ab coil; The normally-closed contact of alarming logic unit first relay K A1 and the normally-closed contact of alarming logic unit second relay KA2 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit the 3rd relay K Ac coil;
One end of alarming logic unit first relay K A1 coil, alarming logic unit second relay K A2 coil, alarming logic unit the 3rd relay K A3 coil is connected with zero line binding post N;
The other end of alarming logic unit first relay K A1 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit second relay K A2 after the other end be connected, the other end of alarming logic unit second relay K A2 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit first relay K A1 after the other end be connected, the other end of alarming logic unit the 3rd relay K A3 coil contact with the normally-closed contact of alarming logic unit second relay K A2 with the normally-closed contact of alarming logic unit first relay K A1 after the other end be connected,
One end of alarming logic unit first relay K A1 normally opened contact, alarming logic unit second relay K A2 normally opened contact, alarming logic unit the 3rd relay K A3 normally opened contact links together into shared tie point; The other end of alarming logic unit first relay K A1 normally opened contact is connected with the other end of alarming logic unit first relay K A1 coil, the other end of alarming logic unit second relay K A2 normally opened contact is connected with the other end of alarming logic unit second relay K A2 coil, and the other end of alarming logic unit the 3rd relay K A3 normally opened contact is connected with the other end of alarming logic unit the 3rd relay K A3 coil;
Also arrange control relay KA, one end of normal indicator light GD, malfunction indicator lamp RD and alarm DL, control relay KA coil, normally indicator light GD, malfunction indicator lamp RD and alarm DL and zero line binding post N to be connected, voltage monitoring unit first relay K Aa normally-closed contact, one end of voltage monitoring unit second relay K Ab normally-closed contact and voltage monitoring unit the 3rd relay K Ac normally-closed contact is connected to shared tie point, voltage monitoring unit first relay K Aa normally-closed contact, the other end of voltage monitoring unit second relay K Ab normally-closed contact and voltage monitoring unit the 3rd relay K Ac normally-closed contact links together, the other end of malfunction indicator lamp RD and the other end of alarm DL are connected to the other end (the i.e. voltage monitoring unit first relay K Aa normally-closed contact of voltage monitoring unit first relay K Aa normally-closed contact, the other end after voltage monitoring unit second relay K Ab normally-closed contact is in parallel with voltage monitoring unit the 3rd relay K Ac normally-closed contact).
The normally opened contact of the normally opened contact of voltage monitoring unit first relay K Aa, the normally opened contact of voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac is contacted successively, one end after series winding connects is connected to shared tie point, the other end after the other end of control relay KA coil and the other end of normal indicator light GD are connected to the normally opened contact of voltage monitoring unit first relay K Aa, the normally opened contact of voltage monitoring unit second relay K Ab, the normally opened contact of voltage monitoring unit the 3rd relay K Ac are contacted successively.
The protective device of above-mentioned power phase shortage, it is characterized in that: must have in voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac tri-relays one electric moment, reactance value relay less than normal first electric; Must have in alarming logic unit first relay K A1, alarming logic unit second relay K A2, alarming logic unit the 3rd relay K A3 tri-relays one electric moment, reactance value relay less than normal first electric.
Beneficial effect of the present invention
The protective device of this power phase shortage, when power phase shortage, sends the signal of power phase shortage automatically, reminds staff to forbid power supply to be powered to operation field by control apparatus, or forbids to start field operation electric equipment.Thus guarantee three-phase electric equipment not reason power supply reason and damaged.Its control relay normally opened contact, is connected in the control loop of three-phase electric equipment, automatic cutting-off controlling loop, disconnects the power supply of three-phase electric equipment, thus guarantees three-phase electric equipment not reason power supply reason and damaged.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the protective device of this power phase shortage.
Fig. 2 is the application drawing at electric drive system of the protective device of this power phase shortage.
In above-mentioned Fig. 1
A-A phase connection terminal, B-B phase connection terminal, C-C phase connection terminal, N-zero line binding post, QF1-three-phase air switch, KAa-voltage monitoring unit first relay,
KAb-voltage monitoring unit second relay, KAc-voltage monitoring unit the 3rd relay;
KA1-alarming logic unit first relay, KA2-alarming logic unit second relay,
KA3-alarming logic unit the 3rd relay; KA-control relay, GD-normal indicator light, RD-malfunction indicator lamp, DL-alarm; 1-first node, 2-Section Point, the 3-the three node, the 4-the four node, the 5-the five node, the 6-the six node, the 7-the seven node, the 8-the eight node, the 9-the nine node;
In above-mentioned Fig. 2
QF-three-pole switch, KM-A.C. contactor, KT-thermal relay, M-motor, QF2-two-phase air switch, SB1-stop button switch, SB2-starting button switch, DY-protection for source phase interruption.
Embodiment
In detail the specific embodiment of the present invention is described further below in conjunction with embodiment and accompanying drawing thereof.Further understand to have technical scheme of the present invention.But following embodiment is not construed as limiting the invention.
Embodiment
The embodiment of this device is shown in Fig. 1, and it comprises three-phase air switch QF1 and relay, and the three-phase of three-phase air switch QF1 side is connected with A phase connection terminal A, B phase connection terminal B, C phase connection terminal C respectively; It is characterized in that:
Described relay is voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac, alarming logic unit first relay K A1, alarming logic unit second relay K A2 and alarming logic unit the 3rd continue KA3, the three-phase of three-phase air switch QF1 opposite side respectively connected voltage monitoring unit first relay K Aa coil, voltage monitoring unit second relay KAb coil, one end of voltage monitoring unit the 3rd relay K Ac coil (namely respectively with first node 1, Section Point 2, 3rd node 3 connects), voltage monitoring unit first relay K Aa coil, voltage monitoring unit second relay K Ab coil, the other end of voltage monitoring unit the 3rd relay K Ac coil is connected with zero line binding post N, (the i.e. other end of voltage monitoring unit first relay K Aa coil, be connected with the binding post corresponding with A phase connection terminal A of three-phase air switch QF1 opposite side, the other end of voltage monitoring unit second relay K Ab coil, be connected with the binding post corresponding with B phase connection terminal B of three-phase air switch QF1 opposite side, the other end of voltage monitoring unit the 3rd relay K Ac coil, is connected with the binding post corresponding with C phase connection terminal C of three-phase air switch QF1 opposite side),
The normally-closed contact of alarming logic unit second relay K A2 and the normally-closed contact of alarming logic unit the 3rd relay K A3 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 (being namely connected with first node 1) with voltage monitoring unit first relay K Aa coil; The normally-closed contact of alarming logic unit first relay K A1 and the normally-closed contact of alarming logic unit the 3rd relay K A3 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 (being namely connected with Section Point 2) with voltage monitoring unit second relay K Ab coil; The normally-closed contact of alarming logic unit first relay K A1 and the normally-closed contact of alarming logic unit second relay KA2 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit the 3rd relay K Ac coil (being namely connected with the 3rd node 3);
One end of alarming logic unit first relay K A1 coil, alarming logic unit second relay K A2 coil, alarming logic unit the 3rd relay K A3 coil is connected with zero line binding post N;
The other end of alarming logic unit first relay K A1 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit second relay K A2 after the other end be connected (namely the 4th node 4 connects), the other end of alarming logic unit second relay K A2 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit first relay K A1 after the other end be connected (namely the 5th node 5 connects), the other end of alarming logic unit the 3rd relay K A3 coil contact with the normally-closed contact of alarming logic unit second relay K A2 with the normally-closed contact of alarming logic unit first relay K A1 after the other end be connected (namely the 6th node 6 connects),
One end of alarming logic unit first relay K A1 normally opened contact, alarming logic unit second relay K A2 normally opened contact, alarming logic unit the 3rd relay K A3 normally opened contact links together into shared tie point (i.e. the 7th node 7), the other end of alarming logic unit first relay K A1 normally opened contact is connected with the other end of alarming logic unit first relay K A1 coil that (namely the 4th node 4 connects, namely alarming logic unit first relay K A1 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit second relay K A2 after tie point be connected), the other end of alarming logic unit second relay K A2 normally opened contact is connected (namely the 5th node 5 connects) with the other end of alarming logic unit second relay K A2 coil, the other end of alarming logic unit the 3rd relay K A3 normally opened contact is connected (namely the 6th node 6 connects) with the other end of alarming logic unit the 3rd relay K A3 coil,
The present embodiment also arranges control relay KA, normal indicator light GD, malfunction indicator lamp RD and alarm DL, control relay KA coil, normally indicator light GD, malfunction indicator lamp RD and alarm DL(tetra-electric elements) one end and zero line binding post N be connected, voltage monitoring unit first relay K Aa normally-closed contact, one end of voltage monitoring unit second relay K Ab normally-closed contact and voltage monitoring unit the 3rd relay K Ac normally-closed contact is connected to shared tie point (being namely connected to the 7th node 7), voltage monitoring unit first relay K Aa normally-closed contact, the other end of voltage monitoring unit second relay K Ab normally-closed contact and voltage monitoring unit the 3rd relay K Ac normally-closed contact links together (i.e. the 9th node 9), the other end of malfunction indicator lamp RD and the other end of alarm DL are connected to the other end (i.e. the 9th node 9 of voltage monitoring unit first relay K Aa normally-closed contact, also be connected with the other end of voltage monitoring unit second relay K Ab normally-closed contact and the other end of voltage monitoring unit the 3rd relay K Ac normally-closed contact),
The normally opened contact of the normally opened contact of voltage monitoring unit first relay K Aa, the normally opened contact of voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac is contacted successively and is connect, one end after series winding connects is connected to shared tie point (i.e. the 7th node 7), and the other end of control relay KA coil and the other end of normal indicator light GD are connected to the other end after connecing of contacting (i.e. the 8th node 8);
Control relay KA has normally opened contact.The two ends controlling the normally opened contact of relay K A during use are connected in the control circuit of power consumption equipment.
The following describes the course of work originally preventing power phase shortage circuit;
As can be seen from Figure 1, the voltage monitoring unit first relay K Aa coil of symmetrical star connection, Y connection, voltage monitoring unit second relay K Ab coil and voltage monitoring unit the 3rd relay K Ac is utilized in supply voltage sampling circuit (voltage monitoring unit).When supply voltage is normal, according to the vector assignment relation of symmetrical star electromotive force, voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd the two ends of relay K Ac be applied with 1/ of supply voltage respectively
, when namely supply voltage is 380V, three volt sensing relay two ends institute assignment voltages are 220V, belong to the normal working voltage of voltage detecting relay.Then now, the equal action message of voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac, namely all closed, the normally-closed contact of voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd its normally opened contact of relay K Ac all disconnects.
At voltage monitoring unit (loop) voltage monitoring unit first relay K Aa, while voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac energized action, alarming logic unit first relay K A1, the action logic of alarming logic unit second relay K A2 and alarming logic unit the 3rd relay K A3 tri-Logic judgment relay control circuits is in the state of reciprocal interlocking, i.e. alarming logic unit first relay K A1, an actuating of relay one of in alarming logic unit second relay K A2 and alarming logic unit the 3rd relay K A3, then namely other two relays lose the possibility of action.This be due to alarming logic unit first relay K A1 coil, alarming logic unit second relay K A2 coil can not be completely equal with the reactance value of alarming logic unit the 3rd relay K A3 coil, certainly will cause and obtain electric moment, the preferential action of that " preferably " Logic judgment relay (or KA1 or KA2 or KA3) that reactance value is less than normal.Suppose alarming logic unit first relay K A1, alarming logic unit second relay K A2 and alarming logic unit the 3rd alarming logic unit second relay K A2 preferential action in relay K A3 (normally opened contact of alarming logic unit second relay K A2 closes), then because the normally-closed contact of alarming logic unit second relay K A2 is series at the coil of alarming logic unit first relay K A1 and alarming logic unit the 3rd relay K A3 respectively.Cause its normally-closed contact to disconnect due to the preferential action of alarming logic unit second relay K A2, the solenoid causing alarming logic unit first relay K A1 and alarming logic unit the 3rd relay K A3 in this loop all can not action because can not form current circuit; Now the transmission path of alarm and protection ring current phase line is: B phase power supply---QF1 switch---this loop alarming logic unit first relay K A1 normally-closed contact---this loop alarming logic unit the 3rd relay K A3 normally-closed contact---this loop alarming logic unit second relay K A2 normally opened contact---the 7th node 7 as shown in Figure 1.(in like manner, if alarming logic unit first relay K A1 or the preferential action of alarming logic unit the 3rd relay K A3, also all can form A phase power supply or C phase power supply---the current circuit of the 7th node 7 as shown in Figure 1).
Because voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac normally opened contact close; make it normally indicate the current circuit of loop and control relay KA to be formed, its current circuit is: the 7th node 7 as shown in Figure 1---the 9th node 9---is simultaneously by normal indicator light GD and protection exit control relay KA solenoid.So the normal indicator light GD of this device works, protection exit control relay KA works, and the normally opened contact as the protection exit control relay KA4 of protection exit unit closes, and allows external control circuit to form current circuit, makes its work become possibility.Simultaneously because of voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd the normally-closed contact of relay K Ac three disconnect because of volt sensing relay solenoid energized action belonging to it, make to indicate the faulty indication loop of (warning, protection exit) unit and fault sound equipment can not work because can not form closed path loop.Above situation, all illustrates that detected power-supply system state is normal.
And when a certain phase of power supply (such as A phase) phase shortage, due to the asymmetric reason of power supply three-phase voltage, have influence on the voltage that the voltage monitoring unit first relay K Aa of three-phase symmetrical star connection, Y connection, voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac will show as voltage monitoring unit first relay K Aa solenoid two ends and put on the phase voltage that voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac both end voltage remain 220V(and B phase, C phase for " 0 ").Now, the normally open contact of voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac closes, normally closed interlock disconnects, voltage monitoring unit first electrical equipment KAa does not work (now owing to can not form current circuit, second relay K A2 of alarming logic unit (loop), 3rd relay K A3 is in the selection of preferential action, suppose that " preferably " the Logic judgment relay finally selecting preferential action is KA2 or KA3, from above-mentioned to known the analysis of " warning power logic unit ": now all can provide necessary power supply for alarm and protection loop, rear portion).Instruction (is reported to the police, protection exit) unit (loop), due to voltage monitoring unit first relay K Aa, the connection logic of normally open contact in alarm circuit of voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac belongs to "AND" logic, because the solenoid of voltage monitoring unit first relay K Aa does not work, cause and form open circuit point between the 7th node 7 and the 8th node 8 as shown in Figure 1, can not for the solenoid of the normal indicator light GD that normally runs and protection exit relay K A4 provides necessary working power and make it not work, that is cause normal run indicator GD not indicate, the normally opened contact of protection exit relay K A4 can not close, external control circuit is caused not form current circuit, simultaneously, due to voltage monitoring unit first relay K Aa, the connection form of normally closed interlock in alarm circuit of voltage monitoring unit second relay K Ab and voltage monitoring unit the 3rd relay K Ac belongs to "or" logic, then same not working due to voltage monitoring unit first relay K Aa, so its normally-closed contact can not be opened, thus form current circuit as shown in Figure 1: the 7th node 7---voltage monitoring unit first relay K Aa normally-closed contact---the 9th node 9---simultaneously by alarm DL and malfunction indicator lamp RD---zero line binding post N, malfunction indicator lamp RD, fault alarm DL is initially located in operating state: malfunction indicator lamp RD is shinny to report to the police with alarm DL.In like manner, when B phase or the C phase phase shortage of power supply, also there is same result.
Can find out from above-mentioned analysis: this protective device can be exported the ruuning situation of power supply at any time online by its instruction (warning, protection exit) unit; determined whether continue to carry out power supply supply to production equipment by the logic " diagnosis " of its protection exit unit, and remind post personnel in time when phase shortage or ground connection appear in power supply: system power supply breaks down (phase shortage).
More than belong to the operation principle of the detection of this device, warning operation logic and internal electric source, the feasibility of its application of more detailed explanation that takes a single example below.
application Example
Embodiments of the invention are applied to electric drive system more, protect, protection to electric heater unit to the use of daily motor apparatus, see Fig. 2.The motor M of the electric drive system of the present embodiment successively through the driving element of thermal relay KT, three groups of A.C. contactor KM often open main contacts and be connected with three-phase alternating-current supply with three-pole switch QF.The control loop of electric drive system motor M by stop button switch S B1, starting button switch S B2, one group of A.C. contactor KM often leaves auxiliary contact, the solenoid of A.C. contactor KM, the contact of thermal relay KT form, the solenoid of the normally-closed contact of stop button switch S B1, the normally opened contact of starting button switch S B2, A.C. contactor KM is connected successively with the normally closed auxiliary contact of thermal relay KT, often opens the two ends that auxiliary contact are connected in parallel on starting button switch S B2 normally opened contact for one group of A.C. contactor KM.The normally-closed contact of the stop button switch S B1 of control loop is connected with one end of the normally opened contact of the protection exit control relay KA of protection for source phase interruption DY in the present embodiment; the other end of this normally opened contact and two-phase air switch QF2 wherein one to be connected; another of the normally closed auxiliary contact of the other end instant heating relay K T of control loop and two-phase air switch QF2 is connected, and two-phase air switch QF2 is connected with B with the wherein two-phase A phase of three-phase alternating current.
This power phase shortage application of installation is simple, series connection in the control loop of normal power supplies power distribution equipment circuit breaker is only needed to enter the normally opened contact of this power phase shortage unit protection control of export relay K A, namely three-phase mains voltage detection is carried out by this power phase shortage device, satisfy condition, namely the normally opened contact being connected on this power phase shortage unit protection control of export relay K A in normal power supplies power distribution equipment breaker control circuit provides to operator and allows switching signal (the normal indicator light GD of power supply has instruction), simultaneously, protection exit unit (normally open contact of protection exit control relay KA) closes, make the control loop in this application example only need press starting button switch S B2 can start this dragging system and run, otherwise it is invalid then to press the start-up function of starting button switch S B2 to this dragging system, and outwardly send power failure sound and light alarm prompting.
Claims (2)
1. a protective device for power phase shortage, it comprises three-phase air switch QF1 and relay, and the three-phase of three-phase air switch QF1 side is connected with A phase connection terminal A, B phase connection terminal B, C phase connection terminal C respectively; It is characterized in that:
The three-phase that described relay is voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac, alarming logic unit first relay K A1, alarming logic unit second relay K A2 and alarming logic unit the 3rd continue KA3, three-phase air switch QF1 opposite side respectively connected one end of voltage monitoring unit first relay K Aa coil, voltage monitoring unit second relay KAb coil, voltage monitoring unit the 3rd relay K Ac coil; The other end of voltage monitoring unit first relay K Aa coil, voltage monitoring unit second relay K Ab coil, voltage monitoring unit the 3rd relay K Ac coil is connected with zero line binding post N;
The normally-closed contact of alarming logic unit second relay K A2 and the normally-closed contact of alarming logic unit the 3rd relay K A3 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit first relay K Aa coil; The normally-closed contact of alarming logic unit first relay K A1 and the normally-closed contact of alarming logic unit the 3rd relay K A3 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit second relay K Ab coil; The normally-closed contact of alarming logic unit first relay K A1 and the normally-closed contact of alarming logic unit second relay KA2 are contacted, and the one end after series winding is connected with the link of three-phase air switch QF1 with voltage monitoring unit the 3rd relay K Ac coil;
One end of alarming logic unit first relay K A1 coil, alarming logic unit second relay K A2 coil, alarming logic unit the 3rd relay K A3 coil is connected with zero line binding post N;
The other end of alarming logic unit first relay K A1 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit second relay K A2 after the other end be connected, the other end of alarming logic unit second relay K A2 coil contact with the normally-closed contact of alarming logic unit the 3rd relay K A3 with the normally-closed contact of alarming logic unit first relay K A1 after the other end be connected, the other end of alarming logic unit the 3rd relay K A3 coil contact with the normally-closed contact of alarming logic unit second relay K A2 with the normally-closed contact of alarming logic unit first relay K A1 after the other end be connected,
One end of alarming logic unit first relay K A1 normally opened contact, alarming logic unit second relay K A2 normally opened contact, alarming logic unit the 3rd relay K A3 normally opened contact links together into shared tie point; The other end of alarming logic unit first relay K A1 normally opened contact is connected with the other end of alarming logic unit first relay K A1 coil, the other end of alarming logic unit second relay K A2 normally opened contact is connected with the other end of alarming logic unit second relay K A2 coil, and the other end of alarming logic unit the 3rd relay K A3 normally opened contact is connected with the other end of alarming logic unit the 3rd relay K A3 coil;
Also arrange control relay KA, one end of normal indicator light GD, malfunction indicator lamp RD and alarm DL, control relay KA coil, normally indicator light GD, malfunction indicator lamp RD and alarm DL and zero line binding post N to be connected; One end of voltage monitoring unit first relay K Aa normally-closed contact, voltage monitoring unit second relay K Ab normally-closed contact and voltage monitoring unit the 3rd relay K Ac normally-closed contact is connected to shared tie point, the other end of voltage monitoring unit first relay K Aa normally-closed contact, voltage monitoring unit second relay K Ab normally-closed contact and voltage monitoring unit the 3rd relay K Ac normally-closed contact links together, and the other end of malfunction indicator lamp RD and the other end of alarm DL are connected to the other end of voltage monitoring unit first relay K Aa normally-closed contact;
The normally opened contact of the normally opened contact of voltage monitoring unit first relay K Aa, the normally opened contact of voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac is contacted successively, one end after series winding connects is connected to shared tie point, the other end after the other end of control relay KA coil and the other end of normal indicator light GD are connected to the normally opened contact of voltage monitoring unit first relay K Aa, the normally opened contact of voltage monitoring unit second relay K Ab, the normally opened contact of voltage monitoring unit the 3rd relay K Ac are contacted successively.
2. the protective device of power phase shortage according to claim 1, it is characterized in that: must have in voltage monitoring unit first relay K Aa, voltage monitoring unit second relay K Ab, voltage monitoring unit the 3rd relay K Ac tri-relays one electric moment, reactance value relay less than normal first electric; Must have in alarming logic unit first relay K A1, alarming logic unit second relay K A2, alarming logic unit the 3rd relay K A3 tri-relays one electric moment, reactance value relay less than normal first electric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510472526.4A CN105071340B (en) | 2015-08-05 | 2015-08-05 | A kind of protection device of power phase shortage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510472526.4A CN105071340B (en) | 2015-08-05 | 2015-08-05 | A kind of protection device of power phase shortage |
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| CN105071340A true CN105071340A (en) | 2015-11-18 |
| CN105071340B CN105071340B (en) | 2017-12-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107859617A (en) * | 2017-11-24 | 2018-03-30 | 盐城市建龙机电设备制造有限公司 | A kind of air compressor machine anomaly alarming device |
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|---|---|---|---|---|
| CN1079588A (en) * | 1993-05-26 | 1993-12-15 | 刘桂荣 | Bridging type power supply open-phase protection circuit and device |
| CN103441466A (en) * | 2013-08-16 | 2013-12-11 | 湛江开关有限公司 | Automatic phase-failure zero-failure power-off protection device |
| CN203387153U (en) * | 2013-08-16 | 2014-01-08 | 湛江开关有限公司 | Automatic power-off protection device for phase loss and zero-line deficiency |
| CN203434599U (en) * | 2013-08-14 | 2014-02-12 | 岳洪彬 | Three-phase power supply open-phase protective device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU553709A1 (en) * | 1975-12-29 | 1977-04-05 | Саратовский политехнический институт | Device for protection of a three-phase electric motor against overload and phase failure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079588A (en) * | 1993-05-26 | 1993-12-15 | 刘桂荣 | Bridging type power supply open-phase protection circuit and device |
| CN203434599U (en) * | 2013-08-14 | 2014-02-12 | 岳洪彬 | Three-phase power supply open-phase protective device |
| CN103441466A (en) * | 2013-08-16 | 2013-12-11 | 湛江开关有限公司 | Automatic phase-failure zero-failure power-off protection device |
| CN203387153U (en) * | 2013-08-16 | 2014-01-08 | 湛江开关有限公司 | Automatic power-off protection device for phase loss and zero-line deficiency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107859617A (en) * | 2017-11-24 | 2018-03-30 | 盐城市建龙机电设备制造有限公司 | A kind of air compressor machine anomaly alarming device |
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| CN105071340B (en) | 2017-12-01 |
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