KR102580960B1 - Electric contactor trouble check and protection relay - Google Patents

Abstract

The present invention relates to an electromagnetic contactor protection relay. The magnetic contactor protection relay according to the present invention connects a relay to each phase power source of the driving part 126 of the opening and closing contact part 120 of the magnetic contactor, and connects the relay in parallel with the magnetic contactor coil. By applying the interaction between the driving side 126 and the electromagnetic contactor coil to the control circuit (Sequence) through the relay contact point, abnormal operation of the electromagnetic contactor can be confirmed and the alarm situation is displayed in the second display unit (310). ), It is an electromagnetic contactor protection relay that alerts with light and sound through the third display unit 320.
When the operator monitors the electronic contactor in a third place, the alarm situation can be displayed in the third place through the external output connector 400.

Description

Electronic contactor protection relay{ELECTRIC CONTACTOR TROUBLE CHECK AND PROTECTION RELAY}

The present invention relates to an electromagnetic contactor protection relay that monitors whether the supply and drive sides of the switching contact part perform energization and blocking normally according to the supply and cutoff of power to the coil (COIL) in an electromagnetic contactor that switches on and off a large current. In more detail, Connect a relay (RELAY) in parallel to the coil (COIL) of the electromagnetic contactor to check the power supply status of the coil (COIL) through the relay (RELAY), and power each phase on the driving side (LOAD) of the switching contact of the electromagnetic contactor. By connecting the relay (RELAY) to the coil (COIL), if the relay (RELAY) is ON, the state of each phase power relay (RELAY) on the driving side (LOAD) is also ON. This is applied to the control circuit (SEQUENCE) according to the logic. It concerns a magnetic contactor protection relay that monitors the contactor and warns of abnormal operation.

Electricity is so essential to today's humanity that modern civilization would soon collapse without it. Electric motors run busy, moving factories and producing products. Light up huge cities, travel from city to city on electric trains, and speed down the roads in electric cars. I watch movies, enjoy the internet, and eat fruits and vegetables even when they are not in season. In addition to this, electricity has played an inexplicably important role in the process of creating civilization.

In the use of civilization using electricity, electromagnetic contactors, which function as switches and are used for the purpose of opening and closing large currents, are widely used. In this way, the purpose is very important in the use of electricity, and the reliability of the operation of various electromagnetic contactors is also very important.

Imagine an electromagnetic contactor used in a drain pump. During the rainy season, water rises and it is time to drain, and power is supplied to the electromagnetic contactor coil (COIL) for the drain pump to operate. However, if foreign matter is caught in the open/close contact part (120) of the electromagnetic contactor and electricity is not supplied to the driving side (126) of the electromagnetic contactor, the drain pump is operated. The pump will not be able to operate, resulting in a flooding accident.

The electromagnetic contactor applied to the electric heater used for heating supplies and blocks power to the coil (COIL) of the electromagnetic contactor according to the set temperature and maintains the set temperature. If the temperature is lower than the set temperature, power is supplied to the coil of the magnetic contactor, and the supply side 124 and the drive side 126 of the opening and closing contact part 120 are energized according to the principle of electromagnets to operate the electric heater to lower the temperature. raise it up When the raised temperature reaches the set temperature, the power supply to the coil (COIL) of the electromagnetic contactor is cut off, and the supply side 124 and the drive side 126 of the opening and closing contact part 120 are opened with the movable contact point 128, thereby causing the electric heater. The power supply is cut off and operation stops.

If a short-circuit accident occurs in one of the frequent switching operations and multiple loads, the short-circuit current, which is the fault current, flows through the switching contact portion 120 of the magnetic contactor. The short-circuit current is large enough to melt the opening and closing contact portion 120, so the movable contact 128 and the fixed contact 122 are fused together. In this state, regardless of the coil power of the electromagnetic contactor, the opening and closing contact part 120, where the fixed contact point 122 and the movable contact point 128 are mechanically fused, will continuously supply power to the electric heater. , this will lead to a fire accident. As such, in an electromagnetic contactor, the power supply state of the coil (COIL) and the power state of the driving side 126 of the opening/closing contact portion 120 have a very important correlation.

The electromagnetic contactor using the electromagnetic force of the AC power source is structurally monitored using the auxiliary contact point 180 to this day, but as described above, the opening and closing contact part 120 of the electromagnetic contactor due to foreign matter being caught in the opening and closing contact part 120 or a large current. ) Welding accidents occur frequently in the field, but there have been no parts to solve them until now, and there is a great need for research and development on this.

In the case of SSR (SOLID STATE RELAY), a non-contact relay using a semiconductor device, there is no physical operation, so there is no way to mechanically monitor its opening and closing, and there are no products that can warn of abnormal operation, so research and development on this is required. It can be said that the need is very great.

The present invention was created to solve the above-mentioned problems, and its purpose is to connect a RELAY in parallel to the coil of the electromagnetic contactor in order to ensure the reliability of the operating state in the opening and closing operation of the electromagnetic contactor, The correlation between the coil (COIL) of the electromagnetic contactor and the driving side (126) is connected to the driving side (126) of the magnetic contactor opening/closing contact part (120) with a relay (RELAY) using each phase power as the coil (COIL) power. is checked through each relay and applied to the control circuit (SEQUENCE) to monitor the status of the electromagnetic contactor, identify abnormal operation, and provide an electromagnetic contactor protection relay that warns.

In order to achieve the above-described object, the magnetic contactor protection relay 200 according to the present invention includes a case 201 in the form of a module to accommodate a PCB (not shown) for a control circuit; A relay R1 (500) connected in parallel with the magnetic contactor coil (150) installed inside the case; A coil lead wire 220 exposed on the front of the modular case 201 is provided to connect the relay coil 500 at one end and the electromagnetic contactor coil 150 at the other end in parallel.

R2 (510), R3 (520), and R4 (530) relays (RELAY) that use each phase power ab, bc, and ac of the electromagnetic contactor driving side (126) as RELAY coil power; Each terminal a (126a), b (126b), c (126c) of the driving side 126 of the magnetic contactor opening/closing contact part 120 at one end and relays R2 (510), R3 (520), R4 ( 530) It includes a load lead wire 230 exposed outside the modular case to connect the coil.

Preferably, when power is supplied to the magnetic contactor coil 150, power is supplied to the coil relay R1 (500) connected in parallel through the coil lead wire 220, and R1 (500), which was in the OFF state, is reversed to the ON state.

Preferably, when power is supplied to the electromagnetic contactor coil 150, the fixed contact point 122 and the movable contact point 128 of the opening/closing contact part 120 come into contact, so that power is supplied to the driving side 126, and the driving side 126 is supplied with power. (126) The relay (RELAY), R2 (510), R3 (520), and R4 (530) with ab, bc, and ac as power, inverts from OFF to ON.

Preferably, when the coil relay R1 (500) of the magnetic contactor is in the ON state, the driving relay (RELAY), R2 (510), R3 (520), and R4 (530) are also in the ON state, and conversely, the coil relay R1 (500) ) is in the OFF state, the driving relay (RELAY), R2 (510), R3 (520), and R4 (530) are also in the OFF state.

Based on the above-mentioned logic, the correlation between the coil relay R1 (500) and the driving relay (RELAY), R2 (510), R3 (520), and R4 (530) is applied to the control circuit (SEQUENCE). do. Also, a first display unit 300 according to the result; second display unit 310; Third display unit 320; is provided exposed to the rear of the modular case 201, and the control power supply is characterized by supplying separate power. In addition, the first display unit 300 is characterized by being composed of a light emitting means as an external display means. In addition, the second display unit 310 is characterized by being composed of a light emitting means as an external display means. In addition, the third display unit 320 is characterized by being composed of an external display means and an acoustic means. And the warning display means second display unit 310 and third display unit 320 are characterized in that they can be installed externally through an external output connector 400.

A power lead wire 210 that connects an external power source at one end and a power terminal of a control PCB (not shown) at the other end is exposed to the outside of the modular case 201.

According to the magnetic contactor protection relay 200 according to an embodiment of the present invention, the power supply status of the magnetic contactor coil 150 is confirmed through the coil relay R1 (500) connected in parallel with the coil 150, and the opening and closing contact portion ( 120) The three-phase power supply status of the driving side 126 can be checked through the driving side relays R2 (510), R3 (520), and R4 (530) respectively connected to the phase power of the driving side (126).

Depending on the contact status of the coil relay R1 (500) and the driving side relays R2 (510), R3 (520), and R4 (530), the power supply state of the magnetic contactor coil (150) and the power supply state of the driving side (126) are determined. It can be directly compared, normal and abnormal can be determined, and warning and action can be taken before an accident occurs, and it has the effect of protecting the load supplied with power from the driving side 126.

1 is an exploded view of an electromagnetic contactor to aid understanding of an embodiment of the present invention.
Figure 2 is an exploded view of an opening and closing contact portion to aid understanding of an embodiment of the present invention.
Figure 3 is a plan view of an electromagnetic contactor to aid understanding of an embodiment of the present invention.
Figure 4 is a plan view showing the structure of an electromagnetic contactor protection relay according to an embodiment of the present invention.
Figure 5 is a perspective view showing the structure of an electromagnetic contactor protection relay according to an embodiment of the present invention.
Figure 6 is a plan view of an electromagnetic contactor protection relay and an electromagnetic contactor fastened according to an embodiment of the present invention.
Figure 7 is a perspective view of an electromagnetic contactor protection relay and an electromagnetic contactor fastened according to an embodiment of the present invention.
Figure 8 is a control circuit diagram of an electromagnetic contactor protection relay according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference signs to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even if they are shown in different drawings.

Also, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term.

With reference to FIGS. 4 and 5, the structure and operation of the electromagnetic contactor protection relay according to an embodiment of the present invention will be described below.

4 to 5 are diagrams showing the overall structure of an electromagnetic contactor protection relay (hereinafter referred to as “this protection relay”) according to an embodiment of the present invention.

Referring to Figures 4 and 5, this protective relay includes a motor-type case 201, a power lead wire a (210a), a power lead wire b (210b), a coil lead wire a (220a), a coil lead wire b (220b), and a load. Includes lead wire a (230a), load lead wire b (230b), load lead wire c (230c), first display unit 300, second display unit 310, third display unit 320, and external output connector 400. .

With reference to FIGS. 6 and 7, the structure and operation of this protection relay according to an embodiment of the present invention will be described below.

Referring to FIGS. 6 and 7, one end of the power lead wire a (210a) and the power lead wire b (210b) are respectively fastened to the power terminal of the control circuit PCB (not shown) inside the motor-type case 200, and the other ends The end is fastened to an external power source,

One end of the coil lead wire a (220a) and coil lead wire b (220b) is fastened to the coil terminal a (150a) and coil terminal b (150b) of the electromagnetic contactor 100, and the other end is controlled inside the motul type case 201. Each is connected to the power terminal of coil relay R1 (500) installed on the circuit PCB.

One end of the load lead wire a (230a), load lead wire b (230b), and load lead wire c (230c) is connected to the drive side a (126a), drive side b (126b), and drive side c ( 126c), and the other end is connected to the power terminals of the driving relay R2 (510), the driving relay R3 (520), and the driving relay R4 (530) installed on the control circuit PCB inside the motorized case 200. Each is concluded.

With reference to FIG. 1, the structure and operation of this protection relay according to an embodiment of the present invention will be described below.

Figure 1 is an exploded view of the electromagnetic contactor 100.

Referring to FIG. 1, when power with a constant potential difference (AC 220V or DC24V) is supplied to coil terminal a (150a) and coil terminal b (150b) of the electromagnetic contactor 100, electromagnetic force is generated in the fixed core 160. , the movable core 130 moves toward the fixed core by the magnetic force of the fixed core 160.

The movable contact point 128 fixed to the movable core 130 is in contact with the fixed contact point 122, so that the power supplied to the supply side 124 is passed to the drive side 126.

Figure 2 is an exploded view of the electromagnetic contactor opening/closing contact portion 120 to aid understanding of this protection relay.

Referring to Figure 2, the supply contact point a (124a) of the supply side 124 is energized with the driving contact point a (126a) of the driving side 126, and the supply contact point b (124b) of the supply side 124 is connected to the driving contact point a (126a) of the driving side 126. ) is energized with the driving contact point b (126b), and the supply contact point c (124c) on the supply side 124 is energized with the driving contact point c (126c) on the driving side 126.

Referring to FIG. 8, the operation of this protection relay will be described in detail below.

Figure 8 is a control circuit diagram of this protection relay according to an embodiment of the present invention.

Referring to FIG. 8, when power is supplied to the electromagnetic contactor coil 150, coil relay R1 (500) installed inside the modular case 201 is connected in parallel to coil terminal a (150a) and coil terminal b (150b). Power is also supplied to the COIL.

As described above, when power is supplied to the coil of the magnetic contactor, power from the supply side 124 is also supplied to the drive side 126 of the opening and closing contact portion 120 through the movable contact point 128.

Referring to Figure 8, when power is supplied to the driving contact point a (126a), the driving contact point b (126b), and the driving contact point c (126c) of the driving side 126 of the electromagnetic contactor opening/closing contact part 120, the modular case ( 201) Power is also supplied to the coils of the driving relay R2 (510), the driving relay R3 (520), and the driving relay R4 (530) installed inside.

When power is supplied to the electromagnetic contactor coil 150, power is also supplied to the coil (COIL) of coil relay R1 (500). Power is also supplied to the coils of the drive-side relay R2 (510), the drive-side relay R3 (520), and the drive-side relay R4 (530), respectively.

As described above, when R1 (500) is turned on, it can be seen that R2 (510), R3 (520), and R4 (530) should also be turned on. Conversely, if R1 (500) is OFF, it can be seen that R2 (510), R3 (520), and R4 (530) must also be OFF.

According to the above, when R1 (500) is ON, if any of R2 (510), R3 (520), or R4 (530) relays are OFF, a disconnection accident may occur due to some problem with the line or magnetic contactor. It can be seen that this is an abnormal operation, meaning that normal three-phase power is not supplied to the load.

As shown in FIG. 8, when R1 (500) is ON, that is, R1 a contact point 502, R2 b contact point 514, R3 b contact point 524, and R4 b contact point 534 are abnormal accidents. Because of this situation, as shown in FIG. 8, when the R1 a contact point 502 is connected in parallel, the R2 b contact point 514, R3 b contact point 524, and R4 b contact point 534 are connected in parallel to display the second display unit 310. ), connected to the third display unit 320. The second display unit is a light emitting unit, and the third display unit is a sound unit that notifies the outside of the accident situation, and can intuitively and immediately warn the operator's location through the external output connector 400.

According to the above, when R1 (500) is OFF, if there is a relay (RELAY) that is ON among R2 (510), R3 (520), and R4 (530), there is a short circuit in the switching contact part 120 of the magnetic contactor due to some problem. It can be seen that this is an abnormal operation in which power is supplied to the load even though an accident occurs and power should not be supplied to the load.

As shown in Figure 8, when R1 (500) is OFF, that is, R1 b contact point 504, R2 a contact point 512, R3 a contact point 522, and R4 a contact point 532 are abnormal accidents. Because of this situation, as shown in FIG. 8, when the R1 b contact point 504 is connected in parallel, the R2 a contact point 512, R3 a contact point 522, and R4 a contact point 532 are connected in parallel to display the second display unit 310. ), connected to the third display unit 320. The second display unit is a light emitting unit, and the third display unit is a sound unit that notifies the outside of the accident situation, and can intuitively and immediately warn the operator's location through the external output connector 400.

In the above-described short-circuit accident, one load among several loads connected to the driving side 126 of the magnetic contactor is accidentally short-circuited, and the short-circuit current, which is the fault current, is connected to the fixed contact point 122 and the movable contact point 128 of the magnetic contactor. This is a common accident situation in which high heat is generated at the contact point as it flows and it becomes fused.

The scope of protection of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is once again added that the scope of protection of the present invention may not be limited due to changes or substitutions that are obvious in the technical field to which the present invention pertains.

100: Electromagnetic contactor 110: Safety cover 112: Arc chamber
120: Open/close contact part 122: Fixed contact point 124: Supply side
124a: supply contact a 124b: supply contact b 124c: supply contact c
126: driving side 126a: driving contact a 126b: driving contact b
126c: driving contact c 128: movable contact 128a: movable contact a
128b: movable contact b 128c: movable contact c 130: movable core
140: Return spring 150: Coil Ass' y 150a: Coil terminal a
150b: coil terminal b 160: fixed core 170: lower frame
180: Auxiliary contact 200: Magnetic contactor protection relay
201: modular case 210a: power lead wire a 210b: power lead wire b
220a: Coil lead wire a 220b: Coil lead wire b 230a: Load lead wire a
230b: load lead wire b 230c: load lead wire c 300: first display unit
310: Second display unit 320: Third display unit 400: External output connector
500: Coil relay R1 502: R1 a contact 504: R1 b contact
510: Driving relay R2 512: R2 a contact 514: R2 b contact
520: Driving relay R3 522: R3 a contact 524: R3 b contact
530: Driving relay R4 532: R4 a contact 534: R4 b contact

Claims (3)

It is equipped with a relay (RELAY) R1 (500) that operates in parallel with the electromagnetic contactor coil (COIL), and the driving side (126) of the electromagnetic contactor opening/closing contact part (120) operates as a relay (RELAY) for each phase power ab, bc, and ac. It includes a control circuit (SEQUENCE) unit provided with each relay (RELAY) R2 (510), R3 (520), and R4 (530) as a coil power supply,
The interaction between the driving side 126 to which the load is connected through the relays R1 (500), R2 (510), R3 (520), and R4 (530) of the control circuit (SEQUENCE) and the electromagnetic contactor coil (150) A second display unit (310) that can distinguish and output an abnormal operation of the electromagnetic contactor through the contacts of R1 (500), R2 (510), R3 (520), and R4 (530). Third display unit 320; and
An electromagnetic contactor protection relay connected to an electromagnetic contactor having an external output connector 400 so that the second display unit 310 and third display unit 320 can be displayed in a third location. In paragraph 1,
When an abnormal operation occurs between the driving side 126 of the magnetic contactor to which the load is connected and the magnetic contactor coil 150, the second display unit 310, which distinguishes and outputs output, outputs a flashing light, The third display unit 320 is an electromagnetic contactor protection relay connected to an electromagnetic contactor that outputs sound. delete