CN204314645U - A kind of low-voltage distribution system by screen break-make automaton - Google Patents

A kind of low-voltage distribution system by screen break-make automaton Download PDF

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Publication number
CN204314645U
CN204314645U CN201420841774.2U CN201420841774U CN204314645U CN 204314645 U CN204314645 U CN 204314645U CN 201420841774 U CN201420841774 U CN 201420841774U CN 204314645 U CN204314645 U CN 204314645U
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China
Prior art keywords
circuit
relay
switchboard
connects
resistance
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Expired - Fee Related
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CN201420841774.2U
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Chinese (zh)
Inventor
张全德
舒甜
王桂周
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Nanyang Medical College
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Nanyang Medical College
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Abstract

A kind of low-voltage distribution system is by screen break-make automaton, comprise some switchboards, connect break-make in the power circuit of switchboard and control main circuit, break-make controls main circuit and comprises relay parallel circuit and universal circuit breaker, first auxiliary normally closed contact one end of universal circuit breaker connects the power circuit of switchboard, and the other end connects relay parallel circuit.Relay parallel circuit comprises interchange, time and auxiliary reclay, the normally closed contact of AC relay is in parallel with the series circuit of the coil of the normally opened contact of the time relay and the series circuit of the coil of auxiliary reclay and the normally opened contact of auxiliary reclay and AC relay with after the coils connected in series of the time relay, the normally closed contact of the time relay of the first switchboard is connected in the power circuit of the second switchboard, other each switchboard the like.Controlling main circuit by connecting break-make on each switchboard, realizing the break-make one by one of each switchboard, in the circuit preventing break-make simultaneously from causing, electric current is excessive.

Description

A kind of low-voltage distribution system by screen break-make automaton
Technical field
The utility model belongs to low-voltage distribution control field, be specifically related to a kind of low-voltage distribution system by screen break-make automaton.
Background technology
In existing low-voltage distribution system, the element of control circuit break-make can usually there be isolating switch, chopper switch, fuse etc. with arc-control device.Due to low-pressure system with load many, the electric current passed through in circuit is large, and in the parts of control circuit break-make, is ensure use safety, and the isolating switch with arc-control device can only be used to carry out the control of connecting and disconnecting of the circuit.But in the middle of real life, the low-voltage distribution system of switchgear building is the multiple-channel output controlled through multiple switchboard simultaneously, it generally carries out by screen Non-follow control break-make according to switchboard.Also indivedual low pressure break-make is had to use automaton; it is only applicable to the device only containing a control flow; simultaneously the protective device of the problem such as supporting automatic process is under-voltage, overcurrent, overload owing to not arranging, easily causes the generation of fire failure, is unfavorable for safety utilization of electric power.If carry out the break-make of Non-follow control multi-screen distribution system simultaneously, whole low-voltage system load can be made to increase, produce low-voltage, big current instantaneously, make the low-pressure side winding of transformer, cause line bag temperature to raise because electric current increases, cause phase insulation aging, reduce service life of equipment; Strong flame electric discharge can be produced simultaneously at on-off switch place, more easily cause the generation of fire failure.
But, up to the present, also do not occur the science that compares, reliably automatically can control multi-screen and be by screen break-make low voltage control device.
Utility model content
The utility model aim to provide a kind of low-voltage distribution system easy to use by screen break-make automaton.
For solving the problems of the technologies described above, the utility model provides following technical scheme: a kind of low-voltage distribution system is by screen break-make automaton, comprise several switchboards, all connect break-make in the power circuit of described each switchboard and control main circuit, described break-make controls main circuit and comprises relay parallel circuit and universal circuit breaker, first auxiliary normally closed contact one end of described universal circuit breaker connects the power circuit of switchboard, the other end connects relay parallel circuit, relay parallel circuit comprises AC relay, the time relay and auxiliary reclay, be connected in parallel with the series circuit of the coil of the normally opened contact of the time relay and the series circuit of the coil of auxiliary reclay and the normally opened contact of auxiliary reclay and AC relay after the normally closed contact of AC relay and the coils connected in series of the time relay, the normally closed contact of the time relay of the first described switchboard is also connected in the power circuit of the second switchboard, the normally closed contact of the time relay of the second switchboard is also connected in the power circuit of the 3rd switchboard, other each switchboard the like.
Be in series with the normally opened contact of relay between described Universal relay and relay parallel circuit, the coil of relay is connected with auxiliary control circuit.
Described auxiliary control circuit comprises AC-DC circuit, triode and NE555 time base circuit, described AC-DC circuit comprises step-down current-limiting circuit, bridge rectifier circuit and filter capacitor, step-down current-limiting circuit one end connects alternating current input end, the other end connects bridge rectifier circuit, the positive output end of bridge rectifier circuit is connected with filter capacitor, the positive output end of bridge rectifier circuit is also respectively by base stage and the collector of the second resistance and the 3rd resistance connecting triode, the base stage of triode also connects the negative output terminal of bridge rectifier circuit by the 4th resistance, the emitter of triode connects the emitter of bridge rectifier circuit by the 5th resistance, the collector of triode connects the input end of NE555 time base circuit, the power end of NE555 time base circuit connects the positive output end of bridge rectifier circuit, the common port of NE555 time base circuit connects the negative output terminal of bridge rectifier circuit, the output terminal of NE555 time base circuit is connected with the coil of relay.
Also warning circuit is connected with in described switchboard circuit, described warning circuit comprises alarm, electron recombination switch and universal circuit breaker, second auxiliary normally closed contact one end of universal circuit breaker connects switchboard circuit, the other end connects electron recombination switch, electron recombination switch electrical connection alarm.
Also protection circuit is connected with in the load circuit of described switchboard, protection circuit is connected with switchboard circuit by the main normally opened contact of Universal relay, described protection circuit comprises computer integrated protection devices, the signal input part of computer integrated protection devices is connected with the signal output part of voltage signal acquisition circuit and current signal Acquisition Circuit, 2 soft relay signal output parts of computer integrated protection devices are series in the power circuit of universal circuit breaker, the breaking coil signal output part of computer integrated protection devices being connected to universal circuit breaker and the closing coil of universal circuit breaker be connected in series with the normally opened contact of AC relay.
Described voltage signal acquisition circuit comprises voltage transformer (VT), and current signal Acquisition Circuit comprises protective current mutual inductor, measurement current transform er and zero sequence current mutual inductor.
By above technical scheme, the beneficial effects of the utility model are: 1, control main circuit by connecting break-make in the power circuit of each switchboard, realize the auto switching in order one by one of each switchboard, in the circuit preventing break-make simultaneously from causing, curent change is excessive, occurs the accidents such as fire; 2, by connecting the normally closed contact of universal circuit breaker in the power circuit of switchboard, the break-make back and forth of switchboard can be prevented; 3, arranging of warning circuit when break-make controls main circuit dead electricity, can send alerting signal, notifies that maintainer overhauls in time; 4, the safe operation arranging the load can protecting switchboard of protection circuit, when there is unusual condition, cuts off the circuit of corresponding load.
Accompanying drawing explanation
Fig. 1 is that the utility model break-make controls main circuit schematic diagram;
Fig. 2 is the utility model auxiliary control circuit schematic diagram;
Fig. 3 is protection circuit block scheme.
Embodiment
A kind of low-voltage distribution system as shown in Figure 1, Figure 2 and Figure 3 by screen break-make automaton, for the first switchboard.In the power circuit of the first switchboard, connect break-make control main circuit, break-make controls main circuit and comprises relay parallel circuit, relay and universal circuit breaker DQ, first auxiliary normally closed contact one end of universal circuit breaker DQ connects the power circuit of switchboard, the other end connects one end of the normally opened contact K1 of relay K 1, and the other end of the normally opened contact of relay K 1 connects relay parallel circuit.Relay parallel circuit comprises AC relay KM, time relay KT, auxiliary reclay KA, the normally closed contact of AC relay KM and the coils connected in series of time relay KT connect into the first series circuit, the normally opened contact of time relay KT and the coils connected in series of auxiliary reclay KA connect into the second series circuit, the normally closed contact of auxiliary reclay KA and the coils connected in series of AC relay KM connect into the 3rd series circuit, the normally opened contact of AC relay KM and the coils connected in series of universal circuit breaker DQ connect into the 4th series circuit, first, second, 3rd, 4th series circuit is connected in parallel, produce chain reaction on the one hand when controlling and make each contact corresponding actions, ensure the stability of circuit on the other hand, prevent the problem of continuous break-make.
In order to the break-make of the normally opened contact of pilot relay K1, the coil of relay K 1 is connected auxiliary control circuit, thus the break-make of the contact of pilot relay K1, realize automatically connecting or disconnecting of the power circuit of switchboard.Auxiliary control circuit comprises AC-DC circuit, triode Q and 555 time base circuit U1.AC-DC circuit comprises the second electric capacity C2 that the first resistance R1 and the first electric capacity C1 is connected in parallel the step-down current-limiting circuit of composition, the bridge rectifier circuit be made up of first, second, third, fourth diode D1, D2, D3, D4 and strobes.Parallel circuit one end connecting interface J1 of the first resistance R1 and the first electric capacity C1, the other end connects the positive pole of the first diode D1 and the negative pole of the second diode D2 of bridge rectifier circuit, the positive pole of the 3rd diode D3 and the negative pole connecting interface J2 of the 4th diode D4, interface J1 and interface J2 connects civil power, the positive pole of the second diode D2 and the plus earth of the 4th diode D4, the negative pole of the first diode D1 is connected the first end of the second electric capacity C2 with the negative pole of the 3rd diode D3, second end of the second electric capacity C2 connects the positive pole of the second diode D2 and the positive pole of the 4th diode D4, thus be direct current by bridge-type finishing circuit by AC conversion after step-down current limliting, then by the second electric capacity C2, the direct current after rectification is carried out the filtering of clutter.The first end of the second electric capacity C2 is also connected with the first end of the second resistance R2 be connected in parallel and the first end of the 3rd resistance R3, second end of the second resistance R2 connects the first end of the 4th resistance R4, second end of the 3rd resistance R3 connects the first end of the 5th resistance R5, the equal ground connection of the second end of the 4th resistance R4 and the 5th resistance R5.The base stage of second end of the second resistance R2 also connecting triode Q, the collector of triode Q connects second end of the 3rd resistance R3, and the emitter of triode Q connects the first end of the 5th resistance R5, thus the control of the conducting played triode Q and cut-off.The collector of triode Q also connects the input end (port is 2) of 555 time base circuit U1, and the output terminal (port is 3) of 555 time base circuit U1 connects one end of the coil of relay K 1, the other end ground connection of the coil of relay K 1.The power input (port is 4,8) of 555 time base circuit U1 connects the first end of the second electric capacity C2, first common port (port is 5) of 555 time base circuit U1 is by the 3rd electric capacity C3 ground connection, and second common port (port is 1) of 555 time base circuit U1 is ground connection directly.Can the coil of pilot relay K1 whether be energized by auxiliary control circuit, thus the normally opened contact of pilot relay K1 closed or connect.
Also warning circuit is connected with at the power circuit of switchboard, warning circuit comprises alarm HA and electron recombination switch U2, second normally closed contact one end of universal circuit breaker DQ connects the power circuit of switchboard, and the other end connects electron recombination switch U2, and electron recombination switch U2 connects alarm HA.When break-make controls main circuit no power, second normally closed contact of universal circuit breaker DQ disconnects, and makes alarm HA send alerting signal, notifies that maintainer overhauls in time.
For ensureing the safe operation of circuit, the normally opened contact of universal circuit breaker DQ is in series with in the load circuit of switchboard, the load circuit of switchboard is also connected with protection circuit simultaneously, protection circuit comprises microcomputer comprehensive treatment device, the signal input part of microcomputer comprehensive treatment device connects voltage transformer (VT), protective current mutual inductor, measurement current transform er and zero sequence current mutual inductor, (port is respectively 113 to 2 soft relay signal output parts of microcomputer comprehensive treatment device, 105) be series in the power circuit of universal circuit breaker DQ, the normally opened contact being also connected to AC relay KM of microcomputer comprehensive treatment device and the series circuit of the first closing coil HQ2 of universal circuit breaker DQ and the breaking coil TQ of universal circuit breaker DQ.Microcomputer comprehensive treatment device carries out com-parison and analysis by signal voltage transformer (VT), protective current mutual inductor, measurement current transform er and zero sequence current mutual inductor measured, and sees loaded line whether normal operation; Time abnormal, output signal makes the breaking coil TQ of universal circuit breaker DQ be energized, and first and second normally closed contact of the universal circuit breaker DQ in the power circuit of switchboard disconnects, thus closes the power circuit of switchboard, prevents peril.
It is more than the connected mode of first switchboard, connected mode on remaining switchboard is identical with the connected mode on the first switchboard, and unique difference is: the connection of the second switchboard: the normally closed contact of the time relay KT break-make on the first switchboard controlled in main circuit is series in the power circuit of the second switchboard; The connection of the 3rd switchboard: the normally closed contact of the time relay KT break-make on the second switchboard controlled in main circuit is series in the power circuit of the 3rd switchboard, other each switchboard the like.
In the process of work, when the power circuit of connection first switchboard, the coil electricity of relay K 1, connect break-make and control main circuit, the coil of time relay KT obtains electric, the normally opened contact time closing of time relay KT; The coil of auxiliary reclay KA is obtained electric, the normally closed contact of auxiliary reclay KA disconnects, the coil losing electricity of AC relay KM, the normally closed contact of AC relay KM is disconnected, AC relay KM coil is finally made to obtain electric, the first closing coil switch HQ1 of universal circuit breaker DQ obtains electric, and the first auxiliary normally closed contact of universal circuit breaker DQ disconnects, thus prevents break-make back and forth.After the power circuit connection of first switchboard, the normally closed contact time delay of the time relay KT of the first switchboard disconnects, thus is connected by the power circuit of the second switchboard.The break-make mode of each switchboard below, thus realize the break-make gradually of each switchboard, prevent each switchboard break-make simultaneously, cause the curent change in circuit excessive, occur peril.
When the work of switchboard occurs abnormal, microcomputer comprehensive treatment device can output signal the breaking coil TQ power-off making universal circuit breaker DQ, thus the main normally opened contact of universal circuit breaker DQ is disconnected, thus protects the load circuit of corresponding switchboard.
The utility model circuit theory is simple, controlling main circuit, realizing the break-make one by one of each switchboard by connecting break-make on each switchboard, and in the circuit preventing break-make simultaneously from causing, electric current is excessive, breaking out of fire accident.In the load circuit of switchboard, connect protection circuit, thus when the load of switchboard occurs abnormal, in time circuit is cut off, try to avert accidents.

Claims (6)

1. a low-voltage distribution system is by screen break-make automaton, comprise several switchboards, it is characterized in that: all connect break-make in the power circuit of described each switchboard and control main circuit, break-make controls main circuit and comprises relay parallel circuit and universal circuit breaker, first auxiliary normally closed contact one end of universal circuit breaker connects the power circuit of switchboard, the other end connects relay parallel circuit, relay parallel circuit comprises AC relay, the time relay and auxiliary reclay, the normally closed contact of AC relay and the coils connected in series of the time relay connect into the first series circuit, the normally opened contact of the time relay and the coils connected in series of auxiliary reclay connect into the second series circuit, the normally opened contact of auxiliary reclay and the coils connected in series of AC relay connect into the 3rd series circuit, the normally opened contact of AC relay and the closing coil of universal circuit breaker are serially connected in the 4th series circuit, first, second, 3rd, 4th series circuit is connected in parallel, the normally closed contact of the time relay of the first switchboard is also connected in the power circuit of the second switchboard, and the normally closed contact of the time relay of the second switchboard is also connected in the power circuit of the 3rd switchboard, other each switchboard the like.
2. low-voltage distribution system as claimed in claim 1 is by screen break-make automaton, and it is characterized in that: the normally opened contact being in series with relay between described Universal relay and relay parallel circuit, the coil of relay is connected with auxiliary control circuit.
3. low-voltage distribution system as claimed in claim 2 is by screen break-make automaton, it is characterized in that: auxiliary control circuit comprises AC-DC circuit, triode and 555 time base circuits, AC-DC circuit comprises step-down current-limiting circuit, the bridge rectifier circuit be made up of first, second, third, fourth diode and the second electric capacity that the first resistance and the first Capacitance parallel connection connect to form, parallel circuit one end of first resistance and the first electric capacity connects the positive output end of civil power, the other end connects the positive pole of the first diode and the negative pole of the second diode, the positive pole of the 3rd diode and the negative pole of the 4th diode connect the negative output terminal of civil power, the positive pole of the second diode and the plus earth of the 4th diode, the negative pole of the first diode is connected the first end of the second electric capacity with the negative pole of the 3rd diode, second end ground connection of the second electric capacity, the first end of the second electric capacity is also connected with the first end of the second resistance be connected in parallel and the first end of the 3rd resistance, second end of the second resistance connects the first end of the 4th resistance, second end of the 3rd resistance connects the first end of the 5th resistance, the equal ground connection of second end of the 4th resistance and the 5th resistance, the base stage of the second end of the second resistance also connecting triode, the collector of triode connects the second end of the 3rd resistance, the emitter of triode connects the first end of the 5th resistance, the collector of triode also connects the input end of 555 time base circuits, the output terminal of 555 time base circuits connects one end of the coil of relay, the other end ground connection of the coil of relay, the power input of 555 time base circuits connects the first end of the second electric capacity, the common end grounding of 555 time base circuits.
4. low-voltage distribution system as claimed in claim 3 is by screen break-make automaton, it is characterized in that: in the power circuit of described switchboard, be also connected with warning circuit, warning circuit comprises alarm, electron recombination switch and universal circuit breaker, second auxiliary normally closed contact one end of universal circuit breaker connects the power circuit of switchboard, the other end connects electron recombination switch, electron recombination switch electrical connection alarm.
5. low-voltage distribution system as claimed in claim 4 is by screen break-make automaton, it is characterized in that: in the load circuit of described switchboard, be also connected with protection circuit, protection circuit is connected with load circuit by the main normally opened contact of Universal relay, described protection circuit comprises computer integrated protection devices, the signal input part of computer integrated protection devices is connected with the signal output part of voltage signal acquisition circuit and current signal Acquisition Circuit, 2 soft relay signal output parts of computer integrated protection devices are series in the power circuit of universal circuit breaker, the breaking coil signal output part of computer integrated protection devices being connected to universal circuit breaker and the closing coil of universal circuit breaker be connected in series with the normally opened contact of AC relay.
6. low-voltage distribution system as claimed in claim 5 is by screen break-make automaton; it is characterized in that: described voltage signal acquisition circuit comprises voltage transformer (VT), and current signal Acquisition Circuit comprises protective current mutual inductor, measurement current transform er and zero sequence current mutual inductor.
CN201420841774.2U 2014-12-28 2014-12-28 A kind of low-voltage distribution system by screen break-make automaton Expired - Fee Related CN204314645U (en)

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CN201420841774.2U CN204314645U (en) 2014-12-28 2014-12-28 A kind of low-voltage distribution system by screen break-make automaton

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CN201420841774.2U CN204314645U (en) 2014-12-28 2014-12-28 A kind of low-voltage distribution system by screen break-make automaton

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109617043A (en) * 2018-10-23 2019-04-12 武汉船用机械有限责任公司 A kind of distribution system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109617043A (en) * 2018-10-23 2019-04-12 武汉船用机械有限责任公司 A kind of distribution system

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150506

Termination date: 20151228

EXPY Termination of patent right or utility model