Relay and power system

Abstract

This specification relates to embodiments of a relay and a power system, the relay comprising a switch that when the relay is removed, connects to a circuit to which the relay is connected, wherein when the relay is removed, a removal signal is transmitted to the switch so that a device having transmitted the removal signal recognizes that the relay has been removed.

Description

Relays and Power Systems

[0001] The present invention relates to a relay and a power system including the same.

[0002] With the electronification of protective relays used for system protection, a normally closed (B) contact relay is utilized to transmit fault conditions externally in the event of a device malfunction. This function notifies the outside world by turning the corresponding contact ON when a malfunction occurs or the device is turned OFF (State 'A' (Open) during normal operation, and State 'B' (Close) when the device's power is turned off or a major malfunction occurs). In other words, the external environment recognizes the device as OFF when it is functioning normally, and as ON when there is a malfunction or the device is turned off.

[0003] Figure 1 illustrates the configuration of such a power system. When a device malfunction occurs or the device power is turned off, the DO in the Normal Open state is closed to sound an external ramp or buzzer to trigger an alarm, or input is given to the DI of another relay to provide information so that the upper monitoring panel (SCADA) can know the device malfunction status.

[0004] Meanwhile, as illustrated in Fig. 2, when a malfunction occurs in the relay (Relay Fail ON) and the relay is drawn out, the Relay Fail DO itself disappears, causing the corresponding DO contact to become OFF. In this case, the warning light and buzzer turn OFF, and since the upper monitoring panel also has a contact in the 0 state, an error occurs in which it is recognized as a Normal state.

[0005] In other words, when the relay is drawn out (referring to the function of separating the relay body from the enclosure) or removed, the signal is turned OFF and the system is mistakenly perceived as normal because the relay itself has been removed despite the abnormal situation, which leads to a problem where the relay connected to the disconnected relay malfunctions or fails to respond to the occurrence of an accident.

[0006] The present invention aims to improve upon the limitations of the prior art as described above.

[0007] Accordingly, the present specification aims to provide an embodiment capable of preventing accidents and malfunctions caused by the disconnection of a relay.

[0008] In addition, we intend to provide an embodiment that enables the stable operation of a power system in response to the failure of a relay.

[0009] Furthermore, we intend to provide an embodiment that can appropriately prevent accidents and malfunctions caused by the failure of a relay in a large-capacity power system.

[0010] In addition, we intend to provide an embodiment that allows for easy replacement and maintenance requiring the removal of the relay.

[0011] The present invention, for solving the problem described above, provides a solution means of maintaining the conduction of a disconnection signal through a switch when the relay disconnects.

[0012] Specifically, the device is characterized by having a switch connected to the circuit to which the relay is connected when the relay is disconnected, such that when the relay is disconnected, a disconnection signal is transmitted to the switch, and the device that transmitted the disconnection signal recognizes the disconnection of the relay.

[0013] Accordingly, by enabling the operation corresponding to the disconnection of the above relay, it is possible to prevent accidents and malfunctions caused by the disconnection of the above relay.

[0014] Such technical features can be applied and implemented in relays, circuit breakers, protection devices, power systems including one or more relays, protection coordination systems, and grid operation systems, and can be particularly usefully applied and implemented in large-capacity power systems. This specification aims to provide embodiments of relays and power systems that utilize the said technical features as a means of solving the problem.

[0015] A relay according to an embodiment is a relay installed in a power system, comprising: an enclosure forming the exterior of the relay and connected to each of a plurality of circuits connected to other devices within the power system; a main body formed as a detachable type that is installed / removed within the enclosure, and when installed within the enclosure, is connected to the plurality of circuits to perform the transmission and reception of signals with the other devices through the plurality of circuits; and a switch that operates OFF to be separated from the plurality of circuits when the main body is installed within the enclosure, and operates ON to connect the plurality of circuits when the main body is removed from the enclosure.

[0016] In the embodiment of the above relay, the switch may be a B-contact switch.

[0017] In the embodiment of the above relay, the switch may be a PUSH button switch provided at a location where the main body is installed within the enclosure.

[0018] In the embodiment of the above relay, when the switch is turned ON to connect the plurality of circuits, a transmission signal transmitted from the other device can be conducted.

[0019] In the embodiment of the above relay, the transmission signal may be a signal for confirming whether the main body has detached.

[0020] In the embodiment of the above relay, the transmission signal may be fed into the switch through a first circuit connected to one end of the switch among the plurality of circuits, conduct, and then output through a second circuit connected to the other end of the switch among the plurality of circuits and returned to the other device.

[0021] A power system according to an embodiment includes a relay disposed in one area, another device disposed in a different area from the one area and transmitting and receiving one or more signals with a device disposed in the one area, and a switching device that is disconnected from the other device when the relay is disposed in the one area, and is connected to the other device when the relay is removed from the one area, thereby allowing a transmission signal transmitted from the other device to conduct.

[0022] In the embodiment of the above power system, the transmission signal can be returned to the other device after being conducted to the switching device.

[0023] In an embodiment of the above power system, when the other device receives the transmitted signal that has been returned after conducting the switching device, it can recognize the disconnection of the relay based on the transmitted signal.

[0024] In an embodiment of the power system above, when the other device recognizes the disconnection of the relay, it may change one or more of the preset values ​​for the protection operation in the other area in response to the disconnection of the relay.

[0025] In an embodiment of the power system above, the switching device may include a first switch that operates OFF when the relay is placed in the one area and operates ON when the relay is removed from the one area, a coil that induces current when the first switch operates ON, and a second switch that operates ON when current is induced in the coil so that the transmission signal is conducted and operates OFF when current is not induced in the coil.

[0026] In the embodiment of the above power system, the first switch may be a B-contact switch provided at the location where the relay is placed.

[0027] In the embodiment of the power system above, one end of the first switch is connected to a power supply terminal and the other end is connected to one end of the coil, so that current can be conducted from the power supply terminal to the coil when the ON operation is performed.

[0028] In an embodiment of the power system above, one end of the coil is connected to the other end of the first switch and the other end is connected to the ground terminal, so that current can be conducted from the first switch to the ground terminal when the first switch is turned ON.

[0029] In an embodiment of the above power system, the second switch may be an A-contact switch provided at a location separated from the first switch and the coil.

[0030] In an embodiment of the above power system, the second switch has one end connected to a first circuit connecting the relay and the other device, and the other end connected to a second circuit connecting the relay and the other device, so that the transmission signal can be conducted when the ON operation is performed.

[0031] The embodiments of the relay and power system described above are not limited to those described above and may include embodiments described in the specific description below or inferred / derived from the specific description.

[0032] According to the embodiment of the relay and power system described above, by maintaining the conduction of the disconnection signal through the switch when the relay disconnects, the effect of preventing failure to recognize disconnection due to sudden disconnection of the relay is achieved.

[0033] Accordingly, this not only prevents accidents and malfunctions caused by relay failure, but also enables stable operation of the power system in response to relay failure.

[0034] In addition, by utilizing a switching device equipped with multiple switches, including relay switches, stable switching can be achieved in large-capacity power systems, and there is an effect of being usefully applicable to large-capacity power systems.

[0035] Furthermore, by preventing accidents and malfunctions caused by relay disconnection, replacement and maintenance requiring relay disconnection can be easily performed, and the stability, reliability, and lifespan of the power system can be enhanced.

[0036] The effects according to the embodiments of the relay and power system described above are not limited to those described above and may include effects described in the specific description below or inferred / derived from the specific description.

[0037] FIG. 1 is a configuration diagram of a conventional power system in which multiple relays are connected.

[0038] FIG. 2 is an example diagram showing the draw-out situation of a relay in the power system illustrated in FIG. 1.

[0039] FIG. 3 is a configuration diagram showing an example of a relay and power system according to an embodiment.

[0040] FIG. 4 is a configuration diagram showing an example of the installation of a relay in the example shown in FIG. 3.

[0041] FIG. 5 is a configuration diagram showing an example of the relay disengaging in the example shown in FIG. 3.

[0042] FIG. 6 is a configuration diagram showing another example of a relay and power system according to an embodiment.

[0043] FIG. 7 is a configuration diagram showing another example of a relay and power system according to an embodiment.

[0044] FIG. 8 is a configuration diagram showing an example of the relay disengagement in the example shown in FIG. 7.

[0045] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0046] Furthermore, in describing the technology disclosed in this specification, detailed descriptions of related prior art are omitted if it is determined that such descriptions could obscure the essence of the technology disclosed in this specification, or if such details can be easily understood or inferred by a person skilled in the art without specific description. Additionally, it should be noted that the attached drawings are intended solely to facilitate an understanding of the concept of the technology disclosed in this specification, and should not be interpreted as limiting the concept of the technology.

[0047] The relay (10) according to the embodiment may be a relay of a power system (1000) as shown in FIG. 3.

[0048] The above power system (1000) is a power system including a plurality of devices, and the plurality of devices can transmit and receive signals to and from each other and perform communication.

[0049] The above relay (10) is positioned in a region (S1) of the power system (1000) and can perform an operation for protecting the power system (1000) in the region (S1).

[0050] The above relay (10) can communicate with the other device (A) installed in the area (S1) and another area (S2) by transmitting and receiving one or more signals.

[0051] Here, the one or more signals may include a signal regarding whether the relay (10) is disconnected.

[0052] The above relay (10) comprises: an outer casing (11) that forms the outer casing of the relay (10) and is connected to each of a plurality of circuits (L1, L2) connected to the other device (A) within the power system (1000); a main body (12) that is formed to be detachable and installed / removed within the outer casing (11), and when installed within the outer casing (11), is connected to the plurality of circuits (L1, L2) to perform signal transmission and reception with the other device (A) through the plurality of circuits (L1, L2); and a switch (13) that operates OFF to be separated from the plurality of circuits (L1, L2) when the main body (12) is installed within the outer casing (11), and operates ON to connect the plurality of circuits (L1, L2) when the main body (12) is removed from the outer casing (11).

[0053] That is, when the main body (12) is installed in the enclosure (11), the switch (13) is turned OFF as shown in FIG. 4, so that the main body (12) and the other device (A) are connected, and when the main body (12) is removed from the enclosure (11), the switch (13) is turned ON as shown in FIG. 5, so that the switch (20) and the other device (A) can be connected.

[0054] Accordingly, when the main body (12) is removed for replacement, inspection, and maintenance before the other device (A) recognizes the removal of the main body (12), the switch (13) is generally inserted into the connection with the other device (A), thereby maintaining signal transmission and reception between the relay (10) and the other device (A), so that the other device (A) can recognize the removal of the main body (12) after the main body (12) is removed.

[0055] Therefore, even if the main body (12) is detached before the detachment of the main body (12) is recognized, subsequent recognition of the main body (12) becomes possible, thereby preventing malfunction caused by the detachment of the main body (12).

[0056] The above switch (13) may be a switch provided in the above enclosure (11).

[0057] The above switch (13) may be a relay switch.

[0058] The above switch (13) may be a switch that disconnects the contacts when operating OFF and connects the contacts when operating ON.

[0059] The above switch (13) may be a B-contact switch.

[0060] The above switch (13) may be a PUSH button switch provided at a location where the main body (12) is installed within the above enclosure (11).

[0061] The above switch (13) can be switched from an ON operation state, in which the contacts are initially connected, to an OFF operation state, in which the connected contacts are disconnected when the button is pressed.

[0062] That is, when the main body (12) is installed inside the enclosure (11), the button of the switch (13) is pressed by the main body (12) to disconnect the contacts that are being connected, and when the main body (12) is removed from the enclosure (11), the button pressed by the main body (12) is restored to connect the contacts that are being disconnected.

[0063] Accordingly, the switch (13) is turned ON when the main body (12) is removed from the enclosure (11) to connect the contacts, thereby allowing it to be connected to each of the plurality of circuits (L1, L2) and receive a signal from the other device (A).

[0064] In this case, the switch (13) may be turned ON within a certain time after the main body (12) is removed from the enclosure (11) to connect the contacts.

[0065] Here, the above fixed time may be 0.1 to 1 [S].

[0066] The above switch (13) can preferably be turned ON immediately after the main body (12) is removed from the enclosure (11) to connect the contacts.

[0067] When the above switch (13) is turned ON to connect the plurality of circuits (L1, L2), a transmission signal transmitted from the other device (A) can be conducted.

[0068] That is, when the main body (12) is detached, the switch (13) is turned ON and connected to each of the plurality of circuits (L1, L2), so that the transmission signal transmitted from the other device (A) can conduct the switch (13).

[0069] The above transmission signal may be a signal for checking whether the main body (12) has detached.

[0070] Accordingly, the other device (A) may check whether the main body (12) has detached after receiving a reply following the transmission signal.

[0071] The above transmission signal may also be a signal output from the main body (12) to the other device (A).

[0072] In this case, the transmission signal may be a signal for transmitting information about the detachment of the main body (12) to the other device (A) before the main body (12) detaches from the enclosure (11).

[0073] The above transmission signal can be fed into the switch (13) through the first circuit (L1) connected to one end of the switch (13) among the plurality of circuits (L1, L2) and conducted, and then output through the second circuit (L2) connected to the other end of the switch (13) among the plurality of circuits (L1, L2) and returned to the other device (A).

[0074] That is, when the main body (12) is detached, the transmission signal is returned to the other device (A) through the switch (13), and the other device (A) can recognize the detachment of the main body (12) based on the transmission signal.

[0075] Accordingly, the other device (A) may recognize the detachment of the main body (12) and perform an operation corresponding to the detachment of the main body (12).

[0076] Therefore, before the detachment of the main body (12) is detected, malfunctions or accidents caused by the detachment of the main body (12) can be prevented, and the operation of the power system (1000) can be carried out stably and accurately.

[0077] In this way, the relay (10) is connected to the other device (A) by the main body (12) as shown in FIG. 4 during normal operation, and by the switch (13) turning ON as shown in FIG. 5 when the main body (12) is removed from the enclosure (11), thereby enabling smooth operation of the power system (1000) in response to the removal of the main body (12).

[0078] Meanwhile, another embodiment of the power system (1000) for solving the problem of the present invention may have a relay (10) and a switch (20) arranged in a parallel structure in one area (S1) as shown in FIG. 6, and the other device (A) arranged in another area (S2).

[0079] That is, the power system (1000) may also be implemented in a form in which the relay (10) and the switch (20) are arranged in a parallel structure with one end and the other end connected to each other in the one area (S1).

[0080] In this case, the switch (20) can operate OFF so that the contacts are separated when the relay (10) is placed in the one area (S1), and operate ON so that the contacts are connected when the relay (10) is removed from the one area (S1).

[0081] Accordingly, when the relay (10) is removed from the area (S1), a signal transmitted from the other device (A) flows into the switch (20) through the first circuit (L1) and conducts the switch (20), and then is returned to the other device (A) through the second circuit (L2), so that the other device (A) can recognize the removal of the relay (10) based on the returned signal.

[0082] In this way, the power system (1000) can be operated in an interlock manner by connecting the relay (10) and the switch (20) in a parallel structure so that one of them is connected to the other device (A).

[0083] Meanwhile, the power system (1000) may find it difficult to stably switch connections with only one switch due to the capacity of the plurality of circuits (L1, L2), etc.

[0084] For example, the sudden disconnection of the above relay (10) immediately causes the circuit to open, and in the case of a high-capacity line, high voltage / high current may be instantaneously amplified and affect the line.

[0085] Alternatively, if the switch for switching the connection is of a specification that cannot handle the capacity of the circuit, there is a risk that damage, loss, or accidents may occur even during the switching operation.

[0086] Accordingly, the switches (13, 20) may be configured to be rated to be able to handle the capacity of the power system (1000), or configured to have one or more switches.

[0087] Another embodiment of the power system (1000) according to this may be as shown in FIGS. 7 and FIGS. 8.

[0088] The above power system (1000) includes the relay (10), the other device (A), and the switching device (30).

[0089] The above switching device (30) may include one or more devices.

[0090] The above switching device (30) can be connected to the enclosure of the above relay (10).

[0091] The above switching device (30) can also be connected to each of the plurality of circuits (L1, L2).

[0092] That is, from the perspective of the other device (A), the relay (10) and the switching device (30) can be connected in a parallel structure.

[0093] The above switching device (30) is disconnected from the other device (A) when the relay (10) is placed in the one area (S1) as shown in FIG. 7, and is connected to the other device (A) when the relay (10) is removed from the one area (S1) as shown in FIG. 8, so that the transmission signal transmitted from the other device (A) is conducted.

[0094] That is, when the relay (10) is placed in the one area (S1), the transmission and reception of a signal between the relay (10) and the other device (A) can be performed, and when the relay (10) is removed from the one area (S1), the transmission and reception of the transmission signal can be performed between the switching device (20) and the other device (A).

[0095] The above transmission signal can be returned to the other device (A) after being conducted to the switching device (30).

[0096] That is, when the relay (10) is removed from the area (S1), the transmission signal can be transmitted from the other device (A) to the switching device (30) through the first circuit (L1) and then returned to the other device (A) through the second circuit (L2).

[0097] When the above other device (A) receives the transmission signal that has been returned after the switching device (30) has been turned on, it can recognize the disconnection of the relay (10) based on the transmission signal.

[0098] That is, when the other device (A) receives the transmitted signal that has been returned after the switching device (30) is turned on while the relay (10) is out of the one area (S1), it may recognize that the relay (10) has been out of the one area (S1).

[0099] When the other device (A) recognizes the disconnection of the relay (10), it can change one or more of the preset values ​​for the protection operation in the other area (S2) in response to the disconnection of the relay (10).

[0100] Here, the above setting value may be an operation mode for protection operation, or an operation standard, etc.

[0101] For example, if the other device (A) detects the disconnection of the relay (10), it may change the operating mode from a mode of operating in protection coordination with the relay (10) to a mode of operating independently.

[0102] The above other device (A) may also, upon recognizing the disconnection of the relay (10), transmit a signal regarding the disconnection information of the relay (10) to one or more communication target devices in response to the disconnection of the relay (10).

[0103] For example, a signal regarding the disconnection information of the relay (10) may be transmitted to another device that is placed in a different area from the other area (S2) and is connected to communication with the other device (A), a control device of the other device (A), a higher-level device of the other device (A), or a control device of the power system (1000), etc.

[0104] The switching device (30), which replaces the relay (10) and connects to the other device (A) when the relay (10) is disconnected, may include a first switch (31), a coil (32), and a second switch (33).

[0105] The first switch (31) can open and close the contacts by switching ON / OFF operation depending on whether the relay (10) is disconnected.

[0106] The first switch (31) can operate OFF when the relay (10) is placed in the one area (S1), and ON when the relay (10) is removed from the one area (S1).

[0107] Accordingly, the first switch (31) may connect the contact when the relay (10) is removed from the area (S1).

[0108] The first switch (31) above may be a B-contact switch provided at the location where the relay (10) is placed.

[0109] The first switch (31) may be a PUSH button switch provided at the location where the relay (10) is placed.

[0110] One end of the first switch (31) is connected to a power supply terminal (POWER: P), and the other end can be connected to one end of the coil (32).

[0111] When the first switch (31) is turned ON, current can be conducted from the power supply terminal (P) to the coil (32).

[0112] The above coil (32) can generate an electromagnetic force when an electric current is induced.

[0113] The above coil (32) can induce current when the first switch (31) is turned ON.

[0114] Accordingly, the coil (32) may induce current and generate electromagnetic force when the relay (10) is removed from the area (S1).

[0115] One end of the coil (32) is connected to the other end of the first switch (31), and the other end can be connected to the ground terminal (GROUND: G).

[0116] The above coil (32) can conduct current from the first switch (31) to the ground terminal (G) when the first switch (31) is turned ON.

[0117] The second switch (33) above can open and close the contact by switching the ON / OFF operation by the electromagnetic force generated from the coil (32).

[0118] The second switch (33) above can be turned ON when current is induced in the coil (32) to conduct the transmission signal, and can be turned OFF when current is not induced in the coil (32).

[0119] Accordingly, the second switch (33) may connect the contact when the relay (10) is removed from the area (S1).

[0120] The second switch (33) may be an A-contact switch provided at a location separated from the first switch (31) and the coil (32).

[0121] One end of the second switch (33) may be connected to the first circuit (L1) connecting the relay (10) and the other device (A), and the other end may be connected to the second circuit (L2) connecting the relay (10) and the other device (A).

[0122] The second switch (33) above can conduct the transmission signal when turned ON.

[0123] That is, when the relay (10) is placed in the one area (S1), as shown in FIG. 7, the first switch (31) is turned OFF due to the placement of the relay (10) and the contacts are separated, so that current is not induced in the coil (32) and the second switch (33) is turned OFF, and when the relay (10) is removed from the one area (S1), as shown in FIG. 8, the first switch (31) is turned ON due to the removal of the relay (10) and the contacts are connected, so that current is induced in the coil (32) and the second switch (33) is turned ON, so that the transmission signal transmitted from the other device (A) can be returned to the other device (A) after conducting the second switch (33).

[0124] As such, the device is equipped with a plurality of switches including the first switch (31) and the second switch (32), and the first switch (31) and the second switch (32) are configured in a separated structure, thereby reducing the capacity burden of each of the first switch (31) and the second switch (32), and also enabling stable connection switching in response to the disconnection of the relay (10).

[0125] That is, the first switch (31) corresponds to the disconnection of the relay (10) and the second switch (33) corresponds to the switching of the connection with the other device (A), so that the first switch (31) and the second switch (33) are functionally separated and the first switch (31) and the second switch (33) are physically isolated, thereby enabling stable switching in a large-capacity power system and making it useful for application in a large-capacity power system.

[0126] Although embodiments of relays and power systems have been described so far, the described embodiments may be modified in various ways without departing from the scope of the invention, and the scope of the invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

[0127] [Explanation of the symbol]

[0128] 10: Relay 11: Enclosure 12: Main body

[0129] 13: Switch 20: Switch 30: Switching device

Claims

1. In a relay installed in a power system, An enclosure forming the exterior of the above relay and connected to each of a plurality of circuits connected to other devices within the power system; A main body formed as a detachable type that is installed / removed within the above enclosure, and when installed within the above enclosure, connected to the plurality of circuits to perform transmission and reception of signals with the other device through the plurality of circuits; and A relay characterized by including a switch that operates OFF to be separated from the plurality of circuits when the main body is installed inside the enclosure, and operates ON to connect the plurality of circuits when the main body is removed from the enclosure.

2. In Paragraph 1, The above switch is, A relay characterized by being a B-contact switch.

3. In Paragraph 1, The above switch is, A relay characterized by being a PUSH button switch provided at a location where the main body is installed within the above enclosure.

4. In Paragraph 1, The above switch is, A relay characterized by conducting a transmission signal transmitted from another device when the ON operation is performed to connect the plurality of circuits.

5. In Paragraph 4, The above transmission signal is, A relay characterized by being a signal for confirming whether the above-mentioned main body has detached.

6. In Paragraph 4, The above transmission signal is, A relay characterized by being supplied to the switch through a first circuit connected to one end of the switch among the plurality of circuits, and then being output through a second circuit connected to the other end of the switch among the plurality of circuits and returned to the other device.

7. In power systems, A relay placed in a single area; Another device disposed in a different area from the above one area and transmitting and receiving one or more signals with the device disposed in the above one area; and A power system characterized by including a switching device in which the relay is disconnected from the other device when placed in the one area, and is connected to the other device when the relay is removed from the one area, so that a transmission signal transmitted from the other device is conducted.

8. In Paragraph 7, The above transmission signal is, A power system characterized by being connected to the above-mentioned switching device and then being returned to the above-mentioned other device.

9. In Paragraph 8, The above other device is, A power system characterized by recognizing the disconnection of the relay based on the transmitted signal when the transmitted signal is received after the switching device is turned on.

10. In Paragraph 9, The above other device is, A power system characterized by changing one or more preset values ​​for protection operations in other areas in response to the disconnection of the relay when the disconnection of the relay is recognized.

11. In Paragraph 7, The above switching device is, A first switch that operates OFF when the relay is placed in the above-mentioned area and operates ON when the relay is removed from the above-mentioned area; A coil that induces current when the first switch above is turned ON; and A power system characterized by including a second switch that operates ON when current is induced in the coil, thereby conducting the transmission signal, and operates OFF when current is not induced in the coil.

12. In Paragraph 11, The above-mentioned first switch is, A power system characterized by being a B-contact switch provided at the location where the above-mentioned relay is placed.

13. In Paragraph 11, The above-mentioned first switch is, A power system characterized by having one end connected to a power supply terminal and the other end connected to one end of the coil, such that current is conducted from the power supply terminal to the coil when the ON operation is performed.

14. In Paragraph 11, The above coil is, A power system characterized in that one end is connected to the other end of the first switch and the other end is connected to a ground terminal, so that when the first switch is turned ON, current flows from the first switch to the ground terminal.

15. In Paragraph 11, The above second switch is, A power system characterized by being an A-contact switch provided at a position separated from the first switch and the coil.

16. In Paragraph 11, The above second switch is, A power system characterized in that one end is connected to a first circuit connecting the relay and the other device, and the other end is connected to a second circuit connecting the relay and the other device, so that the transmission signal is conducted when the ON operation is performed.

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