CN210534611U - Circuit balance protection device - Google Patents

Abstract

The utility model discloses a circuit balance protection device, include: the output end of each voltage output circuit is respectively connected with the input end of a sampling circuit, and the output end of the sampling circuit is connected with the analog quantity input end of the PLC; the signal output end of the PLC is respectively connected with one end of the coils of the second to seventh alternating current contactors, and the other ends of the coils of the second to seventh alternating current contactors are connected with a zero line of a 220V alternating current power supply; one end of each first primary coil is connected with the output end of each phase power supply in the three-phase power supply, and the other end of each first primary coil is a voltage output end; the utility model discloses a sampling circuit gathers actual voltage value and predetermines the voltage value and carry out the comparison, according to the state of opening and shutting of comparative result control ac contactor's contact, reaches for the consumer provides safe power consumption environment according to input voltage automatically regulated output voltage. By using the first primary coil, the power factor is improved, and the harmonic current and the harmonic component of the power supply are reduced.

Description

Circuit balance protection device

Technical Field

The utility model relates to an electric power industry field especially relates to a circuit balance protection device.

Background

In the process of power transmission and power utilization, the voltage of the power utilization equipment is too high or too low, so that the running condition of the equipment can be influenced, and even the equipment can be burnt in severe conditions, so that safety accidents are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a circuit balance protection device can provide safe power consumption environment for the consumer according to three phase current input voltage's height automatically regulated output voltage.

In order to achieve the above object, the utility model provides a following scheme: a circuit balancing protection device comprising: the system comprises a sampling circuit, a PLC, a second alternating current contactor, a third alternating current contactor, a fourth alternating current contactor, a fifth alternating current contactor, a sixth alternating current contactor, a seventh alternating current contactor, three voltage output circuits and three voltage control circuits;

the output end of each voltage output circuit is respectively connected with the input end of the sampling circuit, and the output end of the sampling circuit is connected with the analog quantity input end of the PLC;

the signal output end of the PLC is respectively connected with one end of a coil of the second alternating current contactor, one end of a coil of the third alternating current contactor, one end of a coil of the fourth alternating current contactor, one end of a coil of the fifth alternating current contactor, one end of a coil of the sixth alternating current contactor and one end of a coil of the seventh alternating current contactor, and the other end of the coil of the second alternating current contactor, the other end of the coil of the third alternating current contactor, the other end of the coil of the fourth alternating current contactor, the other end of the coil of the fifth alternating current contactor, the other end of the coil of the sixth alternating current contactor and the other end of the coil of the seventh alternating current contactor are respectively connected with a zero line of a 220V alternating current power supply;

one end of each first primary coil is connected with the output end of each phase power supply in a three-phase power supply, and the other end of each first primary coil is a voltage output end;

each of the voltage control circuits includes: the voltage control circuit comprises a first secondary coil, a second secondary coil and a third secondary coil, wherein the first secondary coil, the second secondary coil and the third secondary coil are consistent in winding mode and are simultaneously connected with the first primary coil through an iron core, and a voltage input line of the voltage control circuit is connected with one end of a normally open contact of the third alternating current contactor, one end of a normally open contact of the fourth alternating current contactor, one end of a normally open contact of the fifth alternating current contactor and one end of a normally open contact of the sixth alternating current contactor; one end of the first secondary coil is connected with the other end of the normally open contact of the second alternating current contactor and the other end of the normally open contact of the third alternating current contactor respectively, the other end of the first secondary coil is connected with one end of the second secondary coil and the other end of the normally open contact of the fourth alternating current contactor respectively, the other end of the second secondary coil is connected with one end of the third secondary coil and the other end of the normally open contact of the fifth alternating current contactor respectively, the other end of the third secondary coil is connected with the other end of the normally open contact of the sixth alternating current contactor and the other end of the normally open contact of the seventh alternating current contactor respectively, one end of the normally open contact of the second alternating current contactor and one end of the normally open contact of the seventh alternating current contactor are connected with the zero line of the 220V alternating current power supply.

Preferably, the circuit balance protection device further comprises a first ac contactor;

one end of a coil of the first alternating current contactor is connected with a signal output end of the PLC, and the other end of the coil of the first alternating current contactor is connected with a zero line of the 220V alternating current power supply;

and three normally open contacts of the first alternating current contactor are respectively connected in parallel at two ends of each first primary coil.

Preferably, the circuit balance protection device further comprises three soft switching circuits for switching the power supply loop;

the soft switching circuits are respectively connected in parallel at two ends of each first primary coil.

Preferably, the protection device further comprises an eighth ac contactor;

one end of a coil of the eighth alternating current contactor is connected with the signal output end of the PLC, and the other end of the coil of the eighth alternating current contactor is connected with a zero line of a 220V alternating current power supply;

and three normally open contacts of the eighth alternating current contactor are respectively connected with the soft switching circuits in series and then are respectively connected with two ends of each first primary coil in parallel.

Preferably, the circuit balance protection device further includes: a ninth alternating current contactor, a tenth alternating current contactor and an eleventh alternating current contactor; one end of the coil of the ninth alternating current contactor, one end of the coil of the tenth alternating current contactor and one end of the coil of the eleventh alternating current contactor are connected with a signal output end of the PLC, and the other end of the coil of the ninth alternating current contactor, the other end of the coil of the tenth alternating current contactor and the other end of the coil of the eleventh alternating current contactor are connected with a zero line of the 220V alternating current power supply;

each of the soft switching circuits includes: the secondary winding comprises a second primary coil, a fourth secondary coil and a fifth secondary coil, wherein the second primary coil, the fourth secondary coil and the fifth secondary coil are connected through an iron core;

one end of the second primary coil is connected with one end of a normally open contact of the eighth alternating current contactor, and the other end of the second primary coil is connected with the other end of the first primary coil; a normally open contact of the ninth alternating current contactor is connected with the second primary coil in parallel; one end of the fourth secondary coil is connected with one end of a normally open contact of the eighth alternating current contactor, and the other end of the fourth secondary coil is connected with a zero line through the normally closed contact of the tenth alternating current contactor; one end of a normally open contact of the eleventh alternating current contactor is connected with one end of the fifth secondary coil, and the other end of the normally open contact of the eleventh alternating current contactor is connected with the other end of the fifth secondary coil.

Preferably, each of the soft switching circuits further includes: a resistance; one end of the resistor is connected with one end of a normally open contact of the eleventh alternating current contactor, and the other end of the resistor is connected with one end of the fifth secondary coil.

Preferably, the protection device further comprises: a fuse;

one end of the fuse is connected with a COM port of the PLC, and the other end of the fuse is connected with a live wire of the 220V alternating current power supply.

According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:

the utility model discloses a PLC passes through sampling circuit and gathers the actual voltage value of three phase output line and predetermine the voltage value and carry out the comparison, according to the state that opens and shuts of comparative result control ac contactor's contact to control first secondary coil, second secondary coil and third secondary coil and insert and surely go out and insert the direction, further realize according to input voltage automatically regulated output voltage's effect, realize providing the purpose of safe power consumption environment for consumer.

The utility model discloses an use first primary coil, make the phase difference between the fundamental wave electric current of AC input and the voltage reduce, improved power factor, reduced the harmonic current, reduced the harmonic composition of power.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a circuit diagram of an embodiment of the present invention;

FIG. 2 is a diagram of a negative feedback voltage-reducing state circuit of the present invention;

FIG. 3 is a schematic diagram of the positive feedback boost status circuit of the present invention;

fig. 4 is a circuit diagram of the soft switching circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model aims at providing a circuit balance protection device can provide safe power consumption environment for the consumer according to three phase current input voltage's height automatically regulated output voltage.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, the circuit balance protection device of the present invention includes: the device comprises a sampling circuit, a PLC, a second alternating current contactor KM2, a third alternating current contactor KM3, a fourth alternating current contactor KM4, a fifth alternating current contactor KM5, a sixth alternating current contactor KM6, a seventh alternating current contactor KM7, three voltage output circuits and three voltage control circuits;

the output end of each voltage output circuit is respectively connected with the input end of the sampling circuit, and the output end of the sampling circuit is connected with the analog quantity input end of the PLC;

the sampling circuit includes: the voltage and/or current data acquisition device comprises a sampling processor and three sensors, wherein each sensor is connected with the voltage output circuit and is used for acquiring voltage and/or current data of the voltage output circuit; one end of the sampling processor is respectively connected with the three sensors, and the other end of the sampling processor is connected with the analog quantity input end of the PLC;

a signal output terminal of the PLC is connected to one end of the coil of the second ac contactor KM2, one end of the coil of the third ac contactor KM3, one end of the coil of the fourth ac contactor KM4, one end of the coil of the fifth ac contactor KM5, one end of the coil of the sixth ac contactor KM6, and one end of the coil of the seventh ac contactor KM7, respectively, and the other end of the coil of the second ac contactor KM2, the other end of the coil of the third ac contactor KM3, the other end of the coil of the fourth ac contactor KM4, the other end of the coil of the fifth ac contactor KM5, the other end of the coil of the sixth ac contactor KM6, and the other end of the coil of the seventh ac contactor KM7, respectively, to a neutral line of a 220V ac power supply;

one end of each first primary coil LA is connected with the output end of each phase power supply in a three-phase power supply, and the other end of each first primary coil LA is a voltage output end;

each of the voltage control circuits includes: a first secondary coil L1, a second secondary coil L2, and a third secondary coil L3, wherein the first secondary coil L1, the second secondary coil L2, and the third secondary coil L3 are wound in the same manner and are simultaneously connected to the first primary coil LA through an iron core, and a voltage input line of the voltage control circuit is connected to one end of a normally open contact of the third ac contactor KM3, one end of a normally open contact of the fourth ac contactor KM4, one end of a normally open contact of the fifth ac contactor KM5, and one end of a normally open contact of the sixth ac contactor KM 6; one end of the first secondary coil L1 is connected to the other end of the normally open contact of the second ac contactor KM2 and the other end of the normally open contact of the third ac contactor KM3, the other end of the first secondary coil L1 is respectively connected with one end of the second secondary coil L2 and the other end of the normally open contact of the fourth ac contactor KM4, the other end of the second secondary coil L2 is respectively connected with one end of the third secondary coil L3 and the other end of the normally open contact of the fifth ac contactor KM5, the other end of the third secondary coil L3 is respectively connected with the other end of the normally open contact of the sixth ac contactor KM6 and the other end of the normally open contact of the seventh ac contactor KM7, one end of the normally open contact of the second alternating current contactor KM2 and one end of the normally open contact of the seventh alternating current contactor KM7 are connected to the neutral line of the 220V alternating current power supply.

The circuit balance protection device of the utility model also comprises a first AC contactor KM 1;

one end of the coil of the first alternating current contactor KM1 is connected with the signal output end of the PLC, and the other end of the coil of the first alternating current contactor KM1 is connected with the zero line of the 220V alternating current power supply;

the three normally open contacts of the first alternating current contactor KM1 are respectively connected in parallel at two ends of each first primary coil LA.

The circuit balance protection device of the utility model also comprises three soft switching circuits for switching the power supply loop;

the soft switching circuits are respectively connected in parallel to both ends of each of the first primary coils LA.

The protection device also comprises an eighth alternating current contactor KM 8;

one end of the coil of the eighth alternating current contactor KM8 is connected with the signal output end of the PLC, and the other end of the coil of the eighth alternating current contactor KM8 is connected with the zero line of a 220V alternating current power supply;

the three normally open contacts of the eighth alternating current contactor KM8 are respectively connected in series with the soft switching circuits and then respectively connected in parallel to two ends of each first primary coil LA.

The utility model discloses circuit balance protection device can be arranged in balanced three phase current's voltage and/or electric current.

As shown in fig. 4, the circuit balance protection device of the present invention further includes: a ninth ac contactor KM9, a tenth ac contactor KM10, an eleventh ac contactor KM 11; one end of the coil of the ninth ac contactor KM9, one end of the coil of the tenth ac contactor KM10, and one end of the coil of the eleventh ac contactor KM11 are connected to a signal output terminal of the PLC, and the other end of the coil of the ninth ac contactor KM9, the other end of the coil of the tenth ac contactor KM10, and the other end of the coil of the eleventh ac contactor KM11 are connected to a neutral line of the 220V ac power supply;

each of the soft switching circuits includes: a second primary coil LB, a fourth secondary coil L4, and a fifth secondary coil L5, the second primary coil LB, the fourth secondary coil L4, and the fifth secondary coil L5 being connected by an iron core;

one end of the second primary coil LB is connected to one end of a normally open contact of the eighth ac contactor KM8, and the other end of the second primary coil LB is connected to the other end of the first primary coil LA; the normally open contact of the ninth alternating current contactor KM9 is connected in parallel with the second primary coil LB; one end of the fourth secondary coil L4 is connected to one end of the normally open contact of the eighth ac contactor KM8, and the other end of the fourth secondary coil L4 is connected to the neutral line through the normally closed contact of the tenth ac contactor KM 10; one end of a normally open contact of the eleventh ac contactor KM11 is connected to one end of the fifth secondary coil L5, and the other end of the normally open contact of the eleventh ac contactor KM11 is connected to the other end of the fifth secondary coil L5.

Each of the soft switching circuits further comprises: a resistance; one end of the resistor is connected to one end of a normally open contact of the eleventh ac contactor KM11, and the other end of the resistor is connected to one end of the fifth secondary coil L5.

The protection device further comprises: a fuse FU; one end of the fuse FU is connected with the COM port of the PLC, and the other end of the fuse FU is connected with the live wire of the 220V alternating current power supply.

The specific working process is as follows:

three sensors in the sampling circuit respectively collect voltage and/or current of each phase power supply of the three-phase power supply to obtain corresponding first data, second data and third data, the sampling processor converts the first data, the second data and the third data to obtain first analog quantity data, the PLC compares the first analog quantity data with a set value, and controls the on-off of a second alternating current contactor KM2, a third alternating current contactor KM3, a fourth alternating current contactor KM4, a fifth alternating current contactor KM5, a sixth alternating current contactor KM6 and a seventh alternating current contactor KM7 according to a comparison result.

When the sampling circuit detects that the voltage and/or current data of the one-phase or multi-phase power supply is higher than a set value, the PLC controls the seventh ac contactor KM7 to be switched on, and simultaneously controls either the third ac contactor KM3, the fourth ac contactor KM4 or the fifth ac contactor KM5 to be switched on, at this time, the circuit state is a negative feedback voltage reduction state, the simplified connection relationship is as shown in fig. 2, the winding direction of the secondary coil is the same as that of the first primary coil LA, at this time, according to lenz's law, the voltage of the secondary coil rises, the generated voltage affects the magnetic flux in the iron core, further affects the first primary coil LA connected with the same iron core, and the rising speed of the voltage and/or current of the first primary coil LA is slowed down or the voltage and/or current of the first primary coil LA is reduced.

When the sampling circuit detects that the voltage and/or current data of one or more phases of power supply is lower than a set value, the PLC controls the second alternating current contactor KM2 to be switched on, and simultaneously controls any one of the fourth alternating current contactor KM4, the fifth alternating current contactor KM5 and the sixth alternating current contactor KM6 to be switched on, at this time, the circuit state is a positive feedback boosting state, the simplified connection relationship is as shown in fig. 3, the winding direction of the secondary coil is opposite to that of the first primary coil LA, at this time, according to lenz's law, the voltage of the secondary coil is increased, the generated voltage influences the magnetic flux in the iron core, further influences the first primary coil LA connected with the same iron core, and the voltage and/or current of the first primary coil LA are increased.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims (7)

1. A circuit balancing protection device, comprising: the device comprises a sampling circuit, a PLC, a second alternating current contactor, a third alternating current contactor, a fourth alternating current contactor, a fifth alternating current contactor, a sixth alternating current contactor, a seventh alternating current contactor, three voltage output circuits, three voltage control circuits and three first primary coils;

the output end of each voltage output circuit is respectively connected with the input end of the sampling circuit, and the output end of the sampling circuit is connected with the analog quantity input end of the PLC;

the signal output end of the PLC is respectively connected with one end of a coil of the second alternating current contactor, one end of a coil of the third alternating current contactor, one end of a coil of the fourth alternating current contactor, one end of a coil of the fifth alternating current contactor, one end of a coil of the sixth alternating current contactor and one end of a coil of the seventh alternating current contactor, and the other end of the coil of the second alternating current contactor, the other end of the coil of the third alternating current contactor, the other end of the coil of the fourth alternating current contactor, the other end of the coil of the fifth alternating current contactor, the other end of the coil of the sixth alternating current contactor and the other end of the coil of the seventh alternating current contactor are respectively connected with a zero line of a 220V alternating current power supply;

one end of each first primary coil is connected with the output end of each phase power supply in a three-phase power supply, and the other end of each first primary coil is a voltage output end;

each of the voltage control circuits includes: the voltage control circuit comprises a first secondary coil, a second secondary coil and a third secondary coil, wherein the first secondary coil, the second secondary coil and the third secondary coil are consistent in winding mode and are simultaneously connected with the first primary coil through an iron core, and a voltage input line of the voltage control circuit is connected with one end of a normally open contact of the third alternating current contactor, one end of a normally open contact of the fourth alternating current contactor, one end of a normally open contact of the fifth alternating current contactor and one end of a normally open contact of the sixth alternating current contactor; one end of the first secondary coil is connected with the other end of the normally open contact of the second alternating current contactor and the other end of the normally open contact of the third alternating current contactor respectively, the other end of the first secondary coil is connected with one end of the second secondary coil and the other end of the normally open contact of the fourth alternating current contactor respectively, the other end of the second secondary coil is connected with one end of the third secondary coil and the other end of the normally open contact of the fifth alternating current contactor respectively, the other end of the third secondary coil is connected with the other end of the normally open contact of the sixth alternating current contactor and the other end of the normally open contact of the seventh alternating current contactor respectively, one end of the normally open contact of the second alternating current contactor and one end of the normally open contact of the seventh alternating current contactor are connected with the zero line of the 220V alternating current power supply.

2. The circuit balancing protection device of claim 1, further comprising a first ac contactor;

one end of a coil of the first alternating current contactor is connected with a signal output end of the PLC, and the other end of the coil of the first alternating current contactor is connected with a zero line of the 220V alternating current power supply;

and three normally open contacts of the first alternating current contactor are respectively connected in parallel at two ends of each first primary coil.

3. The circuit balance protection device of claim 1, further comprising three soft switching circuits for switching the supply loop;

the soft switching circuits are respectively connected in parallel at two ends of each first primary coil.

4. The circuit balancing protection device of claim 3, further comprising an eighth ac contactor;

one end of a coil of the eighth alternating current contactor is connected with the signal output end of the PLC, and the other end of the coil of the eighth alternating current contactor is connected with a zero line of a 220V alternating current power supply;

and three normally open contacts of the eighth alternating current contactor are respectively connected with the soft switching circuits in series and then are respectively connected with two ends of each first primary coil in parallel.

5. The circuit balance protection device of claim 4, further comprising: a ninth alternating current contactor, a tenth alternating current contactor and an eleventh alternating current contactor; one end of the coil of the ninth alternating current contactor, one end of the coil of the tenth alternating current contactor and one end of the coil of the eleventh alternating current contactor are connected with a signal output end of the PLC, and the other end of the coil of the ninth alternating current contactor, the other end of the coil of the tenth alternating current contactor and the other end of the coil of the eleventh alternating current contactor are connected with a zero line of the 220V alternating current power supply;

each of the soft switching circuits includes: the secondary winding comprises a second primary coil, a fourth secondary coil and a fifth secondary coil, wherein the second primary coil, the fourth secondary coil and the fifth secondary coil are connected through an iron core;

one end of the second primary coil is connected with one end of a normally open contact of the eighth alternating current contactor, and the other end of the second primary coil is connected with the other end of the first primary coil; a normally open contact of the ninth alternating current contactor is connected with the second primary coil in parallel; one end of the fourth secondary coil is connected with one end of a normally open contact of the eighth alternating current contactor, and the other end of the fourth secondary coil is connected with a zero line through the normally closed contact of the tenth alternating current contactor; one end of a normally open contact of the eleventh alternating current contactor is connected with one end of the fifth secondary coil, and the other end of the normally open contact of the eleventh alternating current contactor is connected with the other end of the fifth secondary coil.

6. The circuit balance protection device of claim 5, wherein each of said soft switching circuits further comprises: a resistance; one end of the resistor is connected with one end of a normally open contact of the eleventh alternating current contactor, and the other end of the resistor is connected with one end of the fifth secondary coil.

7. The circuit balance protection device of claim 1, further comprising: a fuse;

one end of the fuse is connected with a COM port of the PLC, and the other end of the fuse is connected with a live wire of the 220V alternating current power supply.

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