CN105071340B - A kind of protection device of power phase shortage - Google Patents
A kind of protection device of power phase shortage Download PDFInfo
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- CN105071340B CN105071340B CN201510472526.4A CN201510472526A CN105071340B CN 105071340 B CN105071340 B CN 105071340B CN 201510472526 A CN201510472526 A CN 201510472526A CN 105071340 B CN105071340 B CN 105071340B
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Abstract
The present invention relates to a kind of protection device of power phase shortage, including three-phase air switch and relay.Relay is three voltage monitoring unit relays and three alarming logic unit relays；One terminal connecting zero line binding post of voltage monitoring unit relay coil, another termination three-phase air switch；One terminal connecting zero line binding post of alarming logic unit relay coil, the normally-closed contact that the other end is connected through two other alarming logic unit relay connect three-phase air switch；One end of alarming logic unit relay normally opened contact connects the other end of corresponding coil respectively, and the other end is in parallel；The normally-closed contact both ends of voltage monitoring unit relay and company, one end and alarming logic unit relay normally opened contact and even point connection, and connected with the normally opened contact of three voltage monitoring unit relays, reconnect and connect the normal indicator lamp and control relay coil on ground, the other end connects the malfunction indicator lamp and alarm of earth.The present invention sends power phase failure signal automatically.
Description
Technical field
The present invention relates to the electrical source of power feeding controller in a kind of industrial processes, in particular to a kind of power supply
The protection device of phase shortage.
Background technology
In the production process of modernization, how electric power improves the reliable of power supply supply as most important drive energy
Property, power quality is improved, is run so as to ensure the production equipment of production process under its specified requirement power supply, this is to ensure electricity
The basic demand safe for operation for continuing size with production efficiency of gas equipment.Simultaneously be in large industrial enterprise power quality can
It is even more to concern the major issue that life-and-death matter by property.
Industrial and mining enterprises（Or the unit such as scientific research institution, hospital）Higher is required to open phases of three-phase power source limitation etc. unit, three
Phase power sourced electric equipment is run in the case of phase shortage causes the safely controllable property of the course of work to reduce.Such as：Current industrial and mining enterprises
In widely used threephase asynchronous, if occurring causing power phase shortage due to external cause in its running（Example
Such as B phase dead electricity）, while the control apparatus element of motor just selects to be by other two-phases（One phase）Control power supply is provided（Example
The AC380V power supplys or A provided such as A, C phase（C）The AC220V power supplys mutually provided with neutral conductor N）, now, motor can't be because
The phase shortage of power supply shuts down, but is continued to run with the case where control loop is normally kept, but now, the power supply quality of power supply is
The operation needs of motor can not be met（Phase shortage）, then motor running electric current just need increased dramatically, overcurrent relay due to
Thermal inertia has certain hysteresis, then now very likely causes motor seriously to exceed its specified permission electric current because of electric current（Now
The actual operating current of motor is about 1.4 times of its rated current）And it is burned out；And for example：It is frequent in machine shop etc.
Using in the workplace of crane gear, in the event of overhead traveling crane power supply phase shortage if, be not only possible to lifting electricity
Motivation is burnt, while it is also possible to occurs, because the hoisting moment of overhead traveling crane wherein motor is insufficient, causing large-scale hanging piece lifting
Difficult or downslide, is now then likely to cause hanging piece damage or commanding is lifted by crane by personal injury in bottom surface.Existing power supply
The crane gears such as the protection device of phase shortage, overhead traveling crane mainly detect confession of the power supply to working equipment by " zero-bit " relay etc.
Electric situation, this detection means is just as above-mentioned the same：Be only able to detect with " zero-bit " relay be associated power supply two-phase or
Whether one phase is working properly, and can not accomplish to check the applicability of each phase of whole power supply one by one.
The content of the invention
In order to overcome the above-mentioned deficiency of the protection device of existing power supply phase shortage, the present invention provides a kind of protection of power phase shortage
Device, the device send the signal of power phase shortage automatically in the case of power phase shortage；Its control relay normally opened contact,
It is connected in the control loop of three-phase electrical equipment, automatically cuts off control loop, disconnect the power supply of three-phase electrical equipment, so as to really
Protect three-phase electrical equipment not reason power supply reason and be damaged.
The protection device of this power phase shortage includes three-phase air switch QF1 and relay, three-phase air switch QF1 sides
Three-phase line terminals A, B line terminals B, the C line terminals C that connects that connects that connects respectively with A is connected；It is characterized in that：
Described relay is the first relay of voltage monitoring unit KAa, the second relay of voltage monitoring unit KAb, electricity
Press monitoring unit the 3rd relay KAc, the first relay of alarming logic unit KA1, alarming logic unit the second relay KA2 with
Alarming logic unit the 3rd after KA3, the three-phases of three-phase air switch QF1 opposite sides respectively connected voltage monitoring unit first after
Electrical equipment KAa coils, voltage monitoring unit the second relay KAb coils, one end of the relay KAc coils of voltage monitoring unit the 3rd；
Voltage monitoring unit the first relay KAa coils, voltage monitoring unit the second relay KAb coils, voltage monitoring unit the 3rd
The other end of relay KAc coils is connected with zero line binding post N；
The second relay of alarming logic unit KA2 normally-closed contact is normally closed with the relay KA3's of alarming logic unit the 3rd
Contact is contacted, one end and voltage monitoring unit the first relay KAa coils and three-phase air switch QF1 connection end after series winding
Connection；The first relay of alarming logic unit KA1 normally-closed contact and the relay KA3 of alarming logic unit the 3rd normally-closed contact
Contact, one end and voltage monitoring unit the second relay KAb coils after series winding and three-phase air switch QF1 connection end connect
Connect；The first relay of alarming logic unit KA1 normally-closed contact and the second relay of alarming logic unit KA2 normally-closed contact string
Even, one end after series winding and the relay KAc coils of voltage monitoring unit the 3rd are connected with three-phase air switch QF1 connection end；
Alarming logic unit the first relay KA1 coils, alarming logic unit the second relay KA2 coils, alarming logic
One end of the relay KA3 coils of unit the 3rd is connected with zero line binding post N；
The other ends of alarming logic unit the first relay KA1 coils and the second relay of alarming logic unit KA2's is normal
The other end after closed contact and the relay KA3 of alarming logic unit the 3rd normally-closed contact series winding is connected, alarming logic unit the
The other end of two relay KA2 coils and the first relay of alarming logic unit KA1 normally-closed contact and alarming logic unit the
Other end connection after three relay KA3 normally-closed contact series winding, the other end of the relay KA3 coils of alarming logic unit the 3rd
With the normally-closed contact string of the first relay of alarming logic unit KA1 normally-closed contact and the second relay of alarming logic unit KA2
Other end connection after even；
Alarming logic unit the first relay KA1 normally opened contacts, alarming logic unit the second relay KA2 normally opened contacts,
One end of the relay KA3 normally opened contacts of alarming logic unit the 3rd links together into shared tie point；Alarming logic unit
The other end of one relay KA1 normally opened contacts is connected with the other end of alarming logic unit the first relay KA1 coils, and alarm is patrolled
The other end of the other end and alarming logic unit the second relay KA2 coils of collecting unit the second relay KA2 normally opened contacts connects
Connect, the other ends of the relay KA3 normally opened contacts of alarming logic unit the 3rd and the relay KA3 coils of alarming logic unit the 3rd
The other end connects；
Also set up control relay KA, normal indicator lamp GD, malfunction indicator lamp RD and alarm DL, control relay KA
Coil, normal indicator lamp GD, malfunction indicator lamp RD are connected with alarm DL one end and zero line binding post N；Voltage monitoring list
First first relay KAa normally-closed contacts, voltage monitoring unit the second relay KAb normally-closed contacts and voltage monitoring unit the 3rd after
One end of electrical equipment KAc normally-closed contacts is connected to shared tie point, voltage monitoring unit the first relay KAa normally-closed contacts, voltage
Monitoring unit the second relay KAb normally-closed contacts are connected with the other end of the relay KAc normally-closed contacts of voltage monitoring unit the 3rd
Together, the other end of the malfunction indicator lamp RD other end and alarm DL is connected to the first relay of voltage monitoring unit KAa
The other end of normally-closed contact（That is voltage monitoring unit the first relay KAa normally-closed contacts, the relay of voltage monitoring unit second
The other end after KAb normally-closed contacts are in parallel with the relay KAc normally-closed contacts of voltage monitoring unit the 3rd）.
The first relay of voltage monitoring unit KAa normally opened contact, the normally opened of the second relay of voltage monitoring unit KAb touch
Point, the relay KAc of voltage monitoring unit the 3rd normally opened contact are contacted successively, and one end after series winding connects is connected to shared connection
Point, the other end of the other end of control relay KA coils and normal indicator lamp GD are connected to the relay of voltage monitoring unit first
KAa normally opened contact, the second relay of voltage monitoring unit KAb normally opened contact, the relay KAc of voltage monitoring unit the 3rd
Normally opened contact contact successively after the other end.
The protection device of above-mentioned power phase shortage, it is characterized in that：The first relay of voltage monitoring unit KAa, voltage monitoring
There must be one obtaining electric moment in the second relay of unit KAb, voltage monitoring unit tri- relays of the 3rd relay KAc,
Reactance value relay less than normal first it is electric；The first relay of alarming logic unit KA1, the relay of alarming logic unit second
Must have in KA2, alarming logic unit tri- relays of the 3rd relay KA3 one electric moment, reactance value are less than normal
Relay first it is electric.
Beneficial effects of the present invention
The protection device of this power phase shortage, in the case of power phase shortage, the signal of power phase shortage is sent automatically, reminds work
Forbid power supply to be powered by control apparatus to operation field as personnel, or forbid to start field operation electrical equipment.So as to really
Protect three-phase electrical equipment not reason power supply reason and be damaged.Its control relay normally opened contact, is connected to three-phase and electrically sets
In standby control loop, control loop is automatically cut off, the power supply of three-phase electrical equipment is disconnected, so that it is guaranteed that three-phase electrical equipment is not
Reason power supply reason and be damaged.
Brief description of the drawings
Fig. 1 is the schematic diagram of the protection device of this power phase shortage.
Fig. 2 is the application drawing in electric drive system of the protection device of this power phase shortage.
In above-mentioned Fig. 1
A-A connects line terminals, and B-B connects line terminals, and C-C connects line terminals, N-zero line binding post, QF1-tri-
Phase air switch, the relay of KAa-voltage monitoring unit first,
The relay of KAb-voltage monitoring unit second, the relay of KAc-voltage monitoring unit the 3rd；
KA1-the relay of alarming logic unit first, KA2-relay of alarming logic unit second,
KA3-the relay of alarming logic unit the 3rd；KA-control relay, GD-normal indicator lamp, RD-failure refer to
Show lamp, DL-alarm；1-first node, 2-section point, the 3-the three node, 4-fourth node, the 5-the five node,
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-electrothermal relay, M-motor, QF2-two-phase air are opened
Close, SB1-stop button switch, SB2-starting button switch, DY-protection for source phase interruption.
Embodiment
The embodiment of the present invention is described further in detail with reference to embodiment and its accompanying drawing.So as to this
The technical scheme of invention has further understanding.But following embodiments are not construed as limiting the invention.
Embodiment
The embodiment of the present apparatus is shown in Fig. 1, and it includes three-phase air switch QF1 and relay, three-phase air switch QF1 sides
Three-phase line terminals A, B line terminals B, the C line terminals C that connects that connects that connects respectively with A be connected；It is characterized in that：
Described relay is the first relay of voltage monitoring unit KAa, the second relay of voltage monitoring unit KAb, electricity
Press monitoring unit the 3rd relay KAc, the first relay of alarming logic unit KA1, alarming logic unit the second relay KA2 with
Alarming logic unit the 3rd after KA3, the three-phases of three-phase air switch QF1 opposite sides respectively connected voltage monitoring unit first after
Electrical equipment KAa coils, voltage monitoring unit the second relay KAb coils, one end of the relay KAc coils of voltage monitoring unit the 3rd
(being connected respectively with first node 1, section point 2, the 3rd node 3), voltage monitoring unit the first relay KAa coils, electricity
Press monitoring unit the second relay KAb coils, the other end and zero line terminals of the relay KAc coils of voltage monitoring unit the 3rd
Sub- N connections；（That is the other end of the first relay of voltage monitoring unit KAa coils, and three-phase air switch QF1 opposite sides and A
Binding post the connection corresponding line terminals that connect A, the other end of voltage monitoring unit the second relay KAb coils, and three-phase
Air switch QF1 opposite sides connect with the B corresponding binding posts of line terminals B that connect, the relay of voltage monitoring unit the 3rd
The other end of KAc coils, and three-phase air switch QF1 opposite sides connect with the C corresponding binding posts of line terminals C that connect）；
The second relay of alarming logic unit KA2 normally-closed contact is normally closed with the relay KA3's of alarming logic unit the 3rd
Contact is contacted, one end and voltage monitoring unit the first relay KAa coils and three-phase air switch QF1 connection end after series winding
Connect (being connected with first node 1)；The first relay of alarming logic unit KA1 normally-closed contact and alarming logic unit the 3rd
Relay KA3 normally-closed contact is contacted, one end and voltage monitoring unit the second relay KAb coils and three-phase air after series winding
Switch QF1 connection end connection（It is connected with section point 2）；The first relay of alarming logic unit KA1 normally-closed contact with
The second relay of alarming logic unit KA2 normally-closed contact is contacted, one end and the relay KAc of voltage monitoring unit the 3rd after series winding
Coil is connected with three-phase air switch QF1 connection end（It is connected with the 3rd node 3）；
Alarming logic unit the first relay KA1 coils, alarming logic unit the second relay KA2 coils, alarming logic
One end of the relay KA3 coils of unit the 3rd is connected with zero line binding post N；
The other ends of alarming logic unit the first relay KA1 coils and the second relay of alarming logic unit KA2's is normal
Closed contact is connected with the other end after the relay KA3 of alarming logic unit the 3rd normally-closed contact series winding（I.e. fourth node 4 connects
Connect）, the other end of alarming logic unit the second relay KA2 coils and the normally closed of the first relay of alarming logic unit KA1 are touched
Point is connected with the other end after the relay KA3 of alarming logic unit the 3rd normally-closed contact series winding（I.e. the 5th node 5 connects）, report
The other end of the alert relay KA3 coils of logic unit the 3rd and the first relay of alarming logic unit KA1 normally-closed contact and report
Other end connection after alert the second relay of logic unit KA2 normally-closed contact series winding（I.e. the 6th node 6 connects）；
Alarming logic unit the first relay KA1 normally opened contacts, alarming logic unit the second relay KA2 normally opened contacts,
One end of the relay KA3 normally opened contacts of alarming logic unit the 3rd links together into shared tie point (i.e. the 7th node 7)；Report
The other ends of alert logic unit the first relay KA1 normally opened contacts and alarming logic unit the first relay KA1 coils it is another
(i.e. fourth node 4 connects, i.e. alarming logic unit the first relay KA1 coils and the relay of alarming logic unit second for end connection
Device KA2 normally-closed contact is connected with the tie point after the relay KA3 of alarming logic unit the 3rd normally-closed contact series winding）, alarm
The other end of logic unit the second relay KA2 normally opened contacts and the other end of alarming logic unit the second relay KA2 coils
Connect (i.e. the 5th node 5 connects), the other end and alarming logic unit of the relay KA3 normally opened contacts of alarming logic unit the 3rd
The other end connection of 3rd relay KA3 coils (i.e. the 6th node 6 connects)；
The present embodiment also sets up control relay KA, normal indicator lamp GD, malfunction indicator lamp RD and alarm DL, control
Relay KA coils, normal indicator lamp GD, malfunction indicator lamp RD and alarm DL（Four electric elements）One end and zero line connect
Line terminals N connections；Voltage monitoring unit the first relay KAa normally-closed contacts, the second relay of voltage monitoring unit KAb are normally closed to be touched
One end of point and the relay KAc normally-closed contacts of voltage monitoring unit the 3rd is connected to shared tie point and (is connected to the 7th node
7), voltage monitoring unit the first relay KAa normally-closed contacts, voltage monitoring unit the second relay KAb normally-closed contacts and voltage
The other end of the relay KAc normally-closed contacts of monitoring unit the 3rd links together (i.e. the 9th node 9), and malfunction indicator lamp RD's is another
One end and alarm the DL other end are connected to the other end the (the i.e. the 9th of voltage monitoring unit the first relay KAa normally-closed contacts
Node 9, also with the other end and the relay of voltage monitoring unit the 3rd of voltage monitoring unit the second relay KAb normally-closed contacts
The other end connection of KAc normally-closed contacts）；
The first relay of voltage monitoring unit KAa normally opened contact, the normally opened of the second relay of voltage monitoring unit KAb touch
Point, the relay KAc of voltage monitoring unit the 3rd normally opened contact are contacted connect successively, and one end after series winding connects is connected to shared connection
Point (i.e. the 7th node 7), the other end of the control relay KA coils and normal indicator lamp GD other end are connected to after series winding connects
The other end (i.e. the 8th node 8)；
Control relay KA has normally opened contact.The both ends of control relay KA normally opened contact are connected to electricity consumption and set during use
In standby control circuit.
Illustrate the course of work for originally preventing power phase shortage circuit below；
From figure 1 it appears that supply voltage sampling circuit（Voltage monitoring unit）The middle electricity using symmetrical star connection
Press monitoring unit the first relay KAa coils, voltage monitoring unit the second relay KAb coils and voltage monitoring unit the 3rd after
Electrical equipment KAc.When supply voltage is normal, according to the vector relations of distribution of symmetrical star potential, the relay of voltage monitoring unit first
Device KAa, voltage monitoring unit the second relay KAb and the relay KAc of voltage monitoring unit the 3rd both ends are applied with electricity respectively
The 1/ of source voltage, i.e., when supply voltage is 380V, three volt sensing relay both ends institute assignment voltages are
220V, belong to the normal working voltage of voltage detecting relay.Then now, the first relay of voltage monitoring unit KAa, voltage prison
Survey unit the second relay KAb and the equal action messages of relay KAc of voltage monitoring unit the 3rd, i.e., voltage monitoring unit first after
Electrical equipment KAa, voltage monitoring unit the second relay KAb and relay KAc its normally opened contact of voltage monitoring unit the 3rd close,
Normally-closed contact disconnects.
In voltage monitoring unit（Loop）The first relay of voltage monitoring unit KAa, the relay of voltage monitoring unit second
While KAb is with the 3rd relay KAc energized actions of voltage monitoring unit, the first relay of alarming logic unit KA1, alarm are patrolled
Volume unit the second relay KA2 is dynamic with alarming logic unit tri- logic judgment relay control circuits of the 3rd relay KA3
Make logic and be in state of reciprocal interlocking, i.e. the first relay of alarming logic unit KA1, the second relay of alarming logic unit KA2
With one of the relay KA3 of alarming logic unit the 3rd actuatings of relay, then other two relays be lose action can
Energy.This is due to alarming logic unit the first relay KA1 coils, alarming logic unit the second relay KA2 coils and alarm
The reactance value of the relay KA3 coils of logic unit the 3rd can not possibly be essentially equal, certainly will cause obtaining electric moment, reactance value ratio
That less than normal " preferably " logic judgment relay（Or KA1 or KA2 or KA3）Preferential action.Assuming that alarming logic unit
Alarming logic in first relay KA1, alarming logic unit the second relay KA2 and the relay KA3 of alarming logic unit the 3rd
The second relay of unit KA2 is preferentially acted（The second relay of alarming logic unit KA2 normally opened contact closure）, then due to alarm
The second relay of logic unit KA2 normally-closed contact is series at alarming logic unit the first relay KA1 and alarming logic respectively
The relay KA3 of unit the 3rd coil.Cause its normally closed due to the second relay of alarming logic unit KA2 preferential action
Contact disconnects, and causes the electricity of alarming logic unit the first relay KA1 and relay KA3 of alarming logic unit the 3rd in the loop
Magnetic coil is because can not form current loop without acting；Now the transmission path of alarm and protection ring current phase line is：B phases electricity
Source --- QF1 switches --- this loop alarming logic unit the first relay KA1 normally-closed contact --- this loop alarming logic list
First 3rd relay KA3 normally-closed contacts --- this loop alarming logic unit the second relay KA2 normally opened contact --- are such as Fig. 1 institutes
Show the 7th node 7.（Similarly, if alarming logic unit the first relay KA1 or the relay KA3 of alarming logic unit the 3rd is excellent
First act, also can form A phases power supply or C phase power supplys --- the current loop of the 7th node 7 as shown in Figure 1）.
Because the first relay of voltage monitoring unit KAa, voltage monitoring unit the second relay KAb and voltage monitoring unit
3rd relay KAc normally opened contact closure so that it normally indicates that loop and control relay KA current loop are able to shape
Into its current loop is：7th node 7 --- the 9th node 9 --- as shown in Figure 1 while pass through normal indicator lamp GD and protection
Control of export relay KA magnet coils.So the normal indicator lamp GD work of the device, protection exit control relay KA works
Make, the normally opened contact closure as the protection exit control relay KA4 of protection exit unit, it is allowed to which external control circuit is formed
Current loop, makes it possible its work.Simultaneously because the first relay of voltage monitoring unit KAa, voltage monitoring unit second after
The normally-closed contact of electrical equipment KAb and the relay KAc three of voltage monitoring unit the 3rd are because of its affiliated volt sensing relay electromagnetic wire
Enclose energized action and disconnect so that instruction（Alarm, protection exit）The indicating fault loop of unit and failure sound equipment are because can not form
Closed path loop and can not work.Case above, illustrate that detected power-supply system state is normal.
And work as a certain phase of power supply（Such as A phases）During phase shortage, due to the asymmetric reason of power supply three-phase voltage, three-phase is had influence on
The first relay of voltage monitoring unit KAa, voltage monitoring unit the second relay KAb and the voltage monitoring list of symmetrical star connection
Will be shown as on the 3rd relay KAc of member the voltage at voltage monitoring unit the first relay KAa magnet coils both ends for " 0 ",
And putting on voltage monitoring unit the second relay KAb and the relay KAc both end voltages of voltage monitoring unit the 3rd is still
220V（That is B phases, the phase voltage of C phases）.Now, voltage monitoring unit the second relay KAb and the relay of voltage monitoring unit the 3rd
Device KAc normally open contact closure, normally closed interlock disconnect, voltage monitoring unit the first electrical equipment KAa due to can not form current loop and
Do not work（Now, alarming logic unit（Loop）The second relay KA2, the 3rd relay KA3 be in the selection that preferentially acts
In, it is assumed that final selected " preferably " the logic judgment relay preferentially acted is KA2 or KA3, from above-mentioned to " alarm power logic
Understood in the analysis of unit "：Now it can provide necessary power supply for rear portion alarm and protection loop）.For instruction（Alarm, protect
Shield outlet）Unit（Loop）For, due to the first relay of voltage monitoring unit KAa, the second relay of voltage monitoring unit KAb
Belong to "AND" logic be coupled logic of the relay KAc of voltage monitoring unit the 3rd normally open contact in alarm circuit, due to
The first relay of voltage monitoring unit KAa magnet coil does not work, cause the 7th node 7 and the 8th node 8 as shown in Figure 1 it
Between form open circuit point, it is impossible to for normal indicator lamp GD and protection exit the relay KA4 of normal operation magnet coil, provide must
The working power wanted and it is not worked, that is, cause normal operation indicator lamp GD do not have to indicate, protection exit relay KA4
Normally opened contact will not close, and cause external control circuit to form current loop；Simultaneously as voltage monitoring unit first after
Electrical equipment KAa, voltage monitoring unit the second relay KAb and the relay KAc of voltage monitoring unit the 3rd normally closed interlock are being alarmed
Connection form in loop belongs to "or" logic, then also due to voltage monitoring unit the first relay KAa's does not work, so
Its normally-closed contact can not be opened, so as to form current loop as shown in Figure 1：7th node 7 --- voltage monitoring unit first after
Electrical equipment KAa normally-closed contacts --- the 9th node 9 --- while passing through alarm DL and malfunction indicator lamp RD --- zero line terminals
Sub- N, malfunction indicator lamp RD, fault alarm DL are initially located in working condition：Malfunction indicator lamp RD is shinny and alarm DL alarms.
Similarly, when the B phases or C phase phase shortages of power supply, also there is same result.
It can be seen that from above-mentioned analysis：The protection device can pass through its instruction（Alarm, protection exit）Unit can be at any time
The running situation of power supply is exported online, decides whether to continue to life by the logic " diagnosis " of its protection exit unit
Produce equipment and carry out power supply supply, and post personnel are reminded in time when phase shortage or ground connection occurs in power supply：System power supply breaks down
（Phase shortage）.
Belong to the detection of the device, the operation principle of alarm operation logic and internal electric source above, take a single example below
Illustrate the feasibility of its application more in detail.
Application Example
Embodiments of the invention are applied to electric drive system more, and the use to daily motor apparatus is protected, electricity is added
The protection of thermal, is shown in Fig. 2.Driving elements of the motor M of the electric drive system of the present embodiment successively through electrothermal relay KT,
A.C. contactor KM three groups of normally opened main contacts and three-pole switch QF are connected with three-phase alternating-current supply.Electric drive system motor
M control loop by stop button switch SB1, starting button switch SB2, A.C. contactor KM one group of normally opened auxiliary contact,
A.C. contactor KM magnet coil, electrothermal relay KT contact composition, stop button switch SB1 normally-closed contact, start and press
Button switch SB2 normally opened contact, the normally closed auxiliary contact of A.C. contactor KM magnet coil and electrothermal relay KT are sequentially connected in series,
A.C. contactor KM one group of normally opened auxiliary contact are connected in parallel on the both ends of starting button switch SB2 normally opened contacts.In the present embodiment
The protection exit control relay of the stop button switch SB1 of middle control loop normally-closed contact and protection for source phase interruption DY
One end connection of KA normally opened contact, the other end of the normally opened contact are connected with wherein the one of two-phase air switch QF2, controlled
The other end in loop is electrothermal relay KT normally closed auxiliary contact and two-phase air switch QF2 another being connected, two-phase air
Switch QF2 is connected with the wherein two-phase A phases and B of three-phase alternating current.
The application of this power phase shortage device is simple, it is only necessary to is connected in the control loop of normal power supplies power distribution equipment breaker
Enter this power phase shortage unit protection control of export relay KA normally opened contact, you can pass through this power phase shortage device and carry out three
Phase supply voltage detects, and meets condition, this power phase shortage dress being connected in normal power supplies power distribution equipment breaker control circuit
The normally opened contact for putting protection exit control relay KA provides permission switching signal to operator（The normal indicator lamp GD of power supply has
Instruction）, meanwhile, protection exit unit（Protection exit control relay KA normally open contact）Closure so that in the application example
Control loop need to only press starting button switch SB2 and can start the dragging system and run；Conversely, then press starting by
Start-up functions of the button switch SB2 to the dragging system is invalid, and outwardly sends the sound and light alarm prompting of power failure.
Claims (2)
1. a kind of protection device of power phase shortage, it includes three-phase air switch QF1 and relay, three-phase air switch QF1 mono-
The three-phase of side line terminals A, B line terminals B, the C line terminals C that connects that connects that connects respectively with A is connected；It is characterized in that：
Described relay is the first relay of voltage monitoring unit KAa, the second relay of voltage monitoring unit KAb, voltage prison
Survey the relay KAc of unit the 3rd, the first relay of alarming logic unit KA1, alarming logic unit the second relay KA2 and alarm
The relay KA3 of logic unit the 3rd, the three-phases of three-phase air switch QF1 opposite sides respectively connected voltage monitoring unit first after
Electrical equipment KAa coils, voltage monitoring unit the second relay KAb coils, the one of the relay KAc coils of voltage monitoring unit the 3rd
End；Voltage monitoring unit the first relay KAa coils, voltage monitoring unit the second relay KAb coils, voltage monitoring unit
The other end of three relay KAc coils is connected with zero line binding post N；
The second relay of alarming logic unit KA2 normally-closed contact and the relay KA3 of alarming logic unit the 3rd normally-closed contact
Contact, one end and voltage monitoring unit the first relay KAa coils after series winding and three-phase air switch QF1 connection end connect
Connect；The first relay of alarming logic unit KA1 normally-closed contact and the relay KA3 of alarming logic unit the 3rd normally-closed contact string
Even, one end after series winding and voltage monitoring unit the second relay KAb coils are connected with three-phase air switch QF1 connection end；
The first relay of alarming logic unit KA1 normally-closed contact is contacted with the second relay of alarming logic unit KA2 normally-closed contact,
One end and the relay KAc coils of voltage monitoring unit the 3rd after series winding are connected with three-phase air switch QF1 connection end；
Alarming logic unit the first relay KA1 coils, alarming logic unit the second relay KA2 coils, alarming logic unit
One end of 3rd relay KA3 coils is connected with zero line binding post N；
The other end of alarming logic unit the first relay KA1 coils and the normally closed of the second relay of alarming logic unit KA2 are touched
The other end after point is contacted with the relay KA3 of alarming logic unit the 3rd normally-closed contact is connected, alarming logic unit second after
The other end of electrical equipment KA2 coils and the first relay of alarming logic unit KA1 normally-closed contact and alarming logic unit the 3rd after
Other end connection after electrical equipment KA3 normally-closed contact series winding, the other end and report of the relay KA3 coils of alarming logic unit the 3rd
After alert the first relay of logic unit KA1 normally-closed contact and the second relay of alarming logic unit KA2 normally-closed contact are contacted
The other end connection；
Alarming logic unit the first relay KA1 normally opened contacts, alarming logic unit the second relay KA2 normally opened contacts, alarm
One end of the relay KA3 normally opened contacts of logic unit the 3rd links together into shared tie point；Alarming logic unit first after
The other end of electrical equipment KA1 normally opened contacts connects with the other end of alarming logic unit the first relay KA1 coils, alarming logic list
The other end of first second relay KA2 normally opened contacts connects with the other end of alarming logic unit the second relay KA2 coils, reports
The other ends of the alert relay KA3 normally opened contacts of logic unit the 3rd and the relay KA3 coils of alarming logic unit the 3rd it is another
End connection；
Also set up control relay KA, normal indicator lamp GD, malfunction indicator lamp RD and alarm DL, control relay KA lines
Circle, normal indicator lamp GD, malfunction indicator lamp RD are connected with alarm DL one end and zero line binding post N；Voltage monitoring unit
First relay KAa normally-closed contacts, voltage monitoring unit the second relay KAb normally-closed contacts and the relay of voltage monitoring unit the 3rd
One end of device KAc normally-closed contacts is connected to shared tie point, voltage monitoring unit the first relay KAa normally-closed contacts, voltage prison
The other end for surveying unit the second relay KAb normally-closed contacts and the relay KAc normally-closed contacts of voltage monitoring unit the 3rd is connected to
Together, it is normal to be connected to the first relay of voltage monitoring unit KAa for the malfunction indicator lamp RD other end and alarm the DL other end
The other end of closed contact；
The first relay of voltage monitoring unit KAa normally opened contact, the second relay of voltage monitoring unit KAb normally opened contact,
The relay KAc of voltage monitoring unit the 3rd normally opened contact is contacted successively, and one end after series winding connects is connected to shared tie point, is controlled
The other end of the other end of relay KA coils processed and normal indicator lamp GD is connected to the first relay of voltage monitoring unit KAa's
Normally opened contact, the second relay of voltage monitoring unit KAb normally opened contact, the relay KAc of voltage monitoring unit the 3rd it is normally opened
Contact contact successively after the other end.
2. the protection device of power phase shortage according to claim 1, it is characterized in that：The relay of voltage monitoring unit first
Must have in KAa, the second relay of voltage monitoring unit KAb, voltage monitoring unit tri- relays of the 3rd relay KAc one
Electric moment, reactance value relay less than normal first it is electric；The first relay of alarming logic unit KA1, alarming logic unit
There must be one obtaining electric moment, reactance in second relay KA2, alarming logic unit tri- relays of the 3rd relay KA3
Value relay less than normal first it is electric.
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| 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201510472526.4A CN105071340B (en) | 2015-08-05 | 2015-08-05 | A kind of protection device of power phase shortage |
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| Publication Number | Publication Date |
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| CN105071340A CN105071340A (en) | 2015-11-18 |
| CN105071340B true CN105071340B (en) | 2017-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510472526.4A Active CN105071340B (en) | 2015-08-05 | 2015-08-05 | A kind of protection device of power phase shortage |
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| 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 |
Citations (5)
| 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 |
| 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 |
-
2015
- 2015-08-05 CN CN201510472526.4A patent/CN105071340B/en active Active
Patent Citations (5)
| 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 |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN105071340A (en) | 2015-11-18 |
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