CN210402132U - Safety protection device - Google Patents
Safety protection device Download PDFInfo
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- CN210402132U CN210402132U CN201921969141.9U CN201921969141U CN210402132U CN 210402132 U CN210402132 U CN 210402132U CN 201921969141 U CN201921969141 U CN 201921969141U CN 210402132 U CN210402132 U CN 210402132U
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- current contactor
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- 230000006698 induction Effects 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
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Abstract
The utility model discloses a safety protection device. The protection device includes: the system comprises a voltage sampling circuit, a PLC, a second alternating current contactor, a third alternating current contactor and three output voltage control circuits; the PLC acquires an actual voltage value of a three-phase output line through the voltage sampling circuit and compares the actual voltage value with a preset voltage value, controls the opening and closing states of contacts of the second alternating current contactor and the third alternating current contactor according to a comparison result, further controls the switching of the connection states of the first main induction coil and the second main induction coil of the output voltage control circuit, achieves the purpose of automatically adjusting the output voltage according to the input voltage, and provides a safe electricity utilization environment for electric equipment.
Description
Technical Field
The utility model relates to an electric power industry field especially relates to a safety arrangement.
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 safety arrangement can provide safe power consumption environment for the consumer according to input voltage's height automatically regulated output voltage.
In order to achieve the above object, the utility model provides a following scheme:
a safety protection device, the protection device comprising: the system comprises a voltage sampling circuit, a PLC, a second alternating current contactor, a third alternating current contactor and three output voltage control circuits;
the input end of the voltage sampling circuit is respectively connected with a three-phase output line, and the output end of the voltage sampling circuit is connected with the analog input end of the PLC; the signal output end of the PLC is respectively connected with one end of the coil of the second alternating current contactor and one end of the coil of the third alternating current contactor; the other end of the coil of the second alternating current contactor is connected with one end of a normally closed contact of the third alternating current contactor; the other end of the coil of the third alternating current contactor is connected with one end of the normally closed contact of the second alternating current contactor; the other end of the normally closed contact of the third alternating current contactor and the other end of the normally closed contact of the second alternating current contactor are both connected with a zero line of 220V commercial power;
first main induction coils of the three output voltage control circuits are respectively connected with three normally open contacts of the second alternating current contactor in series on the three-phase output line; second main induction coils of the three output voltage control circuits are respectively connected with three normally open contacts of the third alternating current contactor in series and then connected to two ends of a line after the normally open contacts of the first main induction coil and the second alternating current contactor are connected in series; and feedback inductance coils of the three output voltage control circuits are respectively connected in series between the three-phase output line and the zero line.
Optionally, one end of the first main inductor coil of the output voltage control circuit, one end of the second main inductor coil of the output voltage control circuit, and one end of the feedback inductor coil of the output voltage control circuit are connected in common; the first main induction coil and the feedback induction coil are homonymous end coils, and the second main induction coil and the feedback induction coil are heteronymous end coils.
Optionally, the protection device further includes three soft switching lines; the three soft switching circuits are respectively connected in parallel at two ends of a circuit formed by connecting the first main induction coil and a second normally open contact of the second alternating current contactor in series; the soft switching circuit is used for preventing the output voltage from generating large fluctuation when the power supply loop is switched.
Optionally, the 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 first alternating current contactor is connected with a zero line of the 220V commercial power;
and three normally open contacts of the first alternating current contactor are respectively connected with three soft switching lines in series and then connected in parallel at two ends of a line after the normally open contacts of the first main induction coil and the second alternating current contactor are connected in series.
Optionally, the protection device further includes: the coil temperature sensor, the fourth alternating current contactor, the fifth alternating current contactor and the sixth alternating current contactor;
the coil temperature sensor is arranged on the energy-saving device, and the signal output end of the coil temperature sensor is connected with the signal input end of the PLC; one end of a coil of the fourth alternating current contactor, one end of a coil of the fifth alternating current contactor and one end of a coil of the sixth alternating current contactor are respectively connected with a signal output end of the PLC, and the other end of the coil of the fourth alternating current contactor, the other end of the coil of the fifth alternating current contactor and the other end of the coil of the sixth alternating current contactor are connected with a zero line of the 220V commercial power; and the normally open contact of the fourth alternating current contactor, the normally open contact of the fifth alternating current contactor and the normally open contact of the sixth alternating current contactor are connected with the soft switching circuit.
Optionally, the soft handover line includes: a first primary coil, a second primary coil, and a secondary coil;
the secondary coil is connected in series with a normally open contact of the first alternating current contactor; the secondary coil is connected with a normally open contact of the fourth alternating current contactor in parallel; the first primary coil and a normally open contact of the fifth alternating current contactor are connected between a single-phase output line and a zero line of the three-phase output line in series; the second primary coil is connected in parallel with the normally open contact of the sixth alternating current contactor.
Optionally, the soft handover line further includes: a resistance;
the resistor is arranged between the second primary coil and the normally open contact of the sixth alternating current contactor.
Optionally, the protection device further includes: a fuse;
one end of the fuse is connected with the COM port of the PLC, and the other end of the fuse is connected with the live wire of the 220V mains 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 the actual voltage value that voltage sampling circuit gathered three phase output line and predetermines the voltage value and carry out the comparison, according to the state of opening and shutting of comparative result control second ac contactor or third ac contactor's contact, and then the switching of the switch-on of controlling first main induction coil and second main induction coil, has realized according to input voltage automatically regulated output voltage, provides safe power consumption environment for the consumer.
The utility model discloses used first main induction coil, second main induction coil and feedback induction coil, made the phase difference between the fundamental wave electric current of AC input and the voltage reduce, improved power factor, reduced 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 a safety protection device provided by 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 safety arrangement can provide safe power consumption environment for the consumer according to 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.
A safety arrangement, as shown in figure 1, comprising: the device comprises a voltage sampling circuit, a PLC, a second alternating current contactor KM2, a third alternating current contactor KM3 and three output voltage control circuits.
The input end of the voltage sampling circuit is respectively connected with the three-phase output line, and the output end of the voltage sampling circuit is connected with the analog input end of the PLC; the signal output end of the PLC is respectively connected with one end of the coil of the second alternating current contactor KM2 and one end of the coil of the third alternating current contactor KM 3; the other end of the coil of the second alternating current contactor KM2 is connected with one end of the normally closed contact of the third alternating current contactor KM 3; the other end of the coil of the third alternating current contactor KM3 is connected with one end of the normally closed contact of the second alternating current contactor KM 2; the other end of the normally closed contact of the third alternating current contactor KM3 and the other end of the normally closed contact of the second alternating current contactor KM2 are both connected with the zero line of the 220V commercial power. Preferably, the PLC is one of the mitsubishi FX series of PLCs.
First main induction coils (L1-1, L1-2 and L1-3) of the three output voltage control circuits are respectively connected with three normally open contacts of a second alternating current contactor KM2 in series on a three-phase output line; second main induction coils (L2-1, L2-2 and L2-3) of the three output voltage control circuits are respectively connected with three normally open contacts of a third alternating current contactor KM3 in series and then connected with two ends of a line formed by connecting the normally open contacts of the first main induction coils (L1-1, L1-2 and L1-3) and the second alternating current contactor KM2 in series; feedback inductance coils (L3-1, L3-2 and L3-3) of the three output voltage control circuits are respectively connected in series between the three-phase output line and a zero line.
One end of a first main induction coil of the output voltage control circuit, one end of a second main induction coil of the output voltage control circuit and one end of a feedback induction coil of the output voltage control circuit are connected in a concurrent mode; the first main induction coil and the feedback induction coil are end coils with the same name, and when a second normally open contact of the second alternating current contactor KM2 is closed, the output voltage is increased according to the electromagnetic induction principle; the second main induction coil and the feedback induction coil are heteronymous end coils, and when the second normally open contact of the third alternating current contactor KM3 is closed, the output voltage is reduced according to the electromagnetic induction principle.
The safety protection device also comprises three soft switching lines; the three soft switching lines are respectively connected in parallel at two ends of a line formed by connecting the first main induction coil (L1-1, L1-2 and L1-3) and the second normally open contact of the second alternating current contactor KM2 in series. The soft switching circuit is used for preventing the output voltage of the alternating current contactor from generating large fluctuation when the alternating current contactor is switched.
As a preferred embodiment, the safety 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 first alternating current contactor is connected with a zero line of 220V commercial power; three normally open contacts of the first alternating current contactor KM1 are connected in series with three soft switching lines respectively and then are connected in parallel at two ends of a line formed by connecting the normally open contacts of the first main induction coil and the second alternating current contactor in series.
The safety protection device further comprises: the coil temperature sensor, the fourth alternating current contactor, the fifth alternating current contactor and the sixth alternating current contactor; the coil temperature sensor is arranged on the energy-saving device, and the signal output end of the coil temperature sensor is connected with the signal input end of the PLC; one end of a coil of the fourth alternating current contactor, one end of a coil of the fifth alternating current contactor and one end of a coil of the sixth alternating current contactor are respectively connected with a signal output end of the PLC, and the other end of the coil of the fourth alternating current contactor, the other end of the coil of the fifth alternating current contactor and the other end of the coil of the sixth alternating current contactor are connected with a zero line of 220V commercial power; and the normally open contact of the fourth alternating current contactor, the normally open contact of the fifth alternating current contactor and the normally open contact of the sixth alternating current contactor are connected with the soft switching circuit.
The soft handover circuitry comprises: a first primary coil, a second primary coil, and a secondary coil; the secondary coil is connected in series with a normally open contact of the first alternating current contactor; the secondary coil is connected with a normally open contact of the fourth alternating current contactor in parallel; the first primary coil and a normally open contact of the fifth alternating current contactor are connected in series between a single-phase output line and a zero line of the three-phase output line, wherein the single phase refers to one of the A phase, the B phase and the C phase; the second primary coil is connected in parallel with the normally open contact of the sixth alternating current contactor.
The soft handover circuitry further comprises: a resistance; the resistor is arranged between the second primary coil and the normally open contact of the sixth alternating current contactor.
The safety protection device further comprises: a fuse; one end of the fuse is connected with the COM port of the PLC, and the other end of the fuse is connected with a live wire of the 220V mains supply. A fuse is an overcurrent protector used to protect the safe operation of a circuit.
The utility model provides a pair of safety arrangement's theory of operation does: the voltage sampling circuit collects the actual voltage value of the three-phase output line and transmits the collected actual voltage value to the PLC, the PLC compares the actual voltage value with a preset voltage value, and controls the on and off of the first alternating current contactor, the second alternating current contactor KM2 or the third alternating current contactor KM3 according to the comparison result, so that the switching of the first main induction coil (L1-1, L1-2, L1-3) and the second main induction coil (L2-1, L2-2 and L2-3) is controlled, the purpose of controlling the output voltage is achieved, and the specific switching process is as follows:
when the actual voltage value is larger than the preset voltage value, firstly, the PLC controls the coil of the second alternating current contactor KM2 to lose power, the normally open contact of the second alternating current contactor KM2 is opened, the first main induction coil (L1-1, L1-2 and L1-3) and the feedback induction coil (L3-1, L3-2 and L3-3) do not mutually induct any more, and the normally closed contact of the second alternating current contactor KM2 is closed; secondly, the PLC continuously controls the coil of the first alternating current contactor to be electrified, the normally open contact of the first alternating current contactor is closed, the input voltage is output to the voltage output end through the soft switching circuit, and the time interval of the switching process is less than 50 ms; then, the PLC controls the coil of the third alternating current contactor KM3 to be electrified, the normally open contact of the third alternating current contactor KM3 is closed, the second main inductance coil (L2-1, L2-2 and L2-3) and the feedback inductance coil (L3-1, L3-2 and L3-3) are mutually inducted, and the normally closed contact of the third alternating current contactor KM3 is opened; meanwhile, the PLC controls the coil of the first alternating current contactor to lose power, the normally open contact of the first alternating current contactor is disconnected, and the switching time of the switching process is less than 50 ms.
When the actual voltage value is smaller than the preset voltage value, firstly, the PLC controls the coil of the third alternating current contactor KM3 to lose power, the normally open contact of the third alternating current contactor KM3 is opened, the second main induction coil (L2-1, L2-2 and L2-3) and the feedback induction coil (L3-1, L3-2 and L3-3) do not mutually induct any more, and the normally closed contact of the third alternating current contactor KM3 is closed; secondly, the PLC continuously controls the coil of the first alternating current contactor to be electrified, the normally open contact of the first alternating current contactor is closed, the input voltage is output to the voltage output end through the soft switching circuit, and the time interval of the switching process is less than 50 ms; then, the PLC controls the coil of the second alternating current contactor KM2 to be electrified, the normally open contact of the second alternating current contactor KM2 is closed, the first main inductance coil (L1-1, L1-2 and L1-3) and the feedback inductance coil (L3-1, L3-2 and L3-3) are mutually inducted, and the normally closed contact of the second alternating current contactor KM2 is opened; meanwhile, the PLC controls the coil of the first alternating current contactor to lose power, the normally open contact of the first alternating current contactor is disconnected, and the switching time of the switching process is less than 50 ms.
The utility model discloses a voltage acquisition circuit gathers the voltage of main circuit, according to the change of voltage, control second ac contactor KM2 or third ac contactor KM3 are closed, play the effect of adjusting output voltage, and when having multiunit positive feedback coil and negative feedback coil, automatically regulated's effect is more ideal.
If this protection device takes place short-circuit fault suddenly, the electric current increases suddenly, can produce a reverse potential who hinders the magnetic flux change among the inductance coils, and reverse potential must produce a reverse current, reaches the change of the sudden increase of restriction current, uses the impact that electrical equipment avoided the heavy current to play the effect of protection consumer.
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 (8)
1. A safety arrangement, characterized in that the arrangement comprises: the system comprises a voltage sampling circuit, a PLC, a second alternating current contactor, a third alternating current contactor and three output voltage control circuits;
the input end of the voltage sampling circuit is respectively connected with a three-phase output line, and the output end of the voltage sampling circuit is connected with the analog input end of the PLC; the signal output end of the PLC is respectively connected with one end of the coil of the second alternating current contactor and one end of the coil of the third alternating current contactor; the other end of the coil of the second alternating current contactor is connected with one end of a normally closed contact of the third alternating current contactor; the other end of the coil of the third alternating current contactor is connected with one end of the normally closed contact of the second alternating current contactor; the other end of the normally closed contact of the third alternating current contactor and the other end of the normally closed contact of the second alternating current contactor are both connected with a zero line of 220V commercial power;
first main induction coils of the three output voltage control circuits are respectively connected with three normally open contacts of the second alternating current contactor in series on the three-phase output line; second main induction coils of the three output voltage control circuits are respectively connected with three normally open contacts of the third alternating current contactor in series and then connected to two ends of a line after the normally open contacts of the first main induction coil and the second alternating current contactor are connected in series; and feedback inductance coils of the three output voltage control circuits are respectively connected in series between the three-phase output line and the zero line.
2. The safety protection device according to claim 1, wherein one end of the first main inductor of the output voltage control circuit, one end of the second main inductor of the output voltage control circuit, and one end of the feedback inductor of the output voltage control circuit are connected in common; the first main induction coil and the feedback induction coil are homonymous end coils, and the second main induction coil and the feedback induction coil are heteronymous end coils.
3. The safety arrangement of claim 1, further comprising three soft switching lines;
the three soft switching circuits are respectively connected in parallel at two ends of a circuit formed by connecting the first main induction coil and a second normally open contact of the second alternating current contactor in series; the soft switching circuit is used for preventing the output voltage from generating large fluctuation when the power supply loop is switched.
4. The safety arrangement of claim 3, 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 first alternating current contactor is connected with a zero line of the 220V commercial power;
and three normally open contacts of the first alternating current contactor are respectively connected with three soft switching lines in series and then connected in parallel at two ends of a line after the normally open contacts of the first main induction coil and the second alternating current contactor are connected in series.
5. The safety protection device of claim 4, wherein the protection device further comprises: the coil temperature sensor, the fourth alternating current contactor, the fifth alternating current contactor and the sixth alternating current contactor;
the coil temperature sensor is arranged on the energy-saving device, and the signal output end of the coil temperature sensor is connected with the signal input end of the PLC; one end of a coil of the fourth alternating current contactor, one end of a coil of the fifth alternating current contactor and one end of a coil of the sixth alternating current contactor are respectively connected with a signal output end of the PLC, and the other end of the coil of the fourth alternating current contactor, the other end of the coil of the fifth alternating current contactor and the other end of the coil of the sixth alternating current contactor are connected with a zero line of the 220V commercial power; and the normally open contact of the fourth alternating current contactor, the normally open contact of the fifth alternating current contactor and the normally open contact of the sixth alternating current contactor are connected with the soft switching circuit.
6. The safety protection device of claim 5, wherein the soft switching line comprises: a first primary coil, a second primary coil, and a secondary coil;
the secondary coil is connected in series with a normally open contact of the first alternating current contactor; the secondary coil is connected with a normally open contact of the fourth alternating current contactor in parallel; the first primary coil and a normally open contact of the fifth alternating current contactor are connected between a single-phase output line and a zero line of the three-phase output line in series; the second primary coil is connected in parallel with the normally open contact of the sixth alternating current contactor.
7. The safety arrangement according to claim 6, wherein the soft handover line further comprises: a resistance;
the resistor is arranged between the second primary coil and the normally open contact of the sixth alternating current contactor.
8. The safety protection device of claim 1, further comprising: a fuse;
one end of the fuse is connected with the COM port of the PLC, and the other end of the fuse is connected with the live wire of the 220V mains supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921969141.9U CN210402132U (en) | 2019-11-14 | 2019-11-14 | Safety protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921969141.9U CN210402132U (en) | 2019-11-14 | 2019-11-14 | Safety protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210402132U true CN210402132U (en) | 2020-04-24 |
Family
ID=70343694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921969141.9U Expired - Fee Related CN210402132U (en) | 2019-11-14 | 2019-11-14 | Safety protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210402132U (en) |
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2019
- 2019-11-14 CN CN201921969141.9U patent/CN210402132U/en not_active Expired - Fee Related
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Granted publication date: 20200424 |
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| CF01 | Termination of patent right due to non-payment of annual fee |