Anti-creeping circuit for overhauling power box

Abstract

The utility model provides an anti-creeping circuit for overhauling a power box. The anti-creeping circuit comprises a main switch, a switching loop, a contactor and a load network, one end of the main switch is connected with a three-phase power supply, and the other end is connected with a load network. The switching loop is connected in parallel with the load network, and a coil of the contactor is arranged in the switching loop; a normally open contact of the contactor is arranged at the joint of the main switch and the load network; the load network comprises a plurality of three-phase sockets connected in parallel and a plurality of single-phase sockets connected in parallel, the three-phase sockets are connected with normally open contacts of the contactors through first circuit breakers, and the single-phase sockets are connected with the normally open contacts of the contactors through second circuit breakers; and the switching loop intermittently excites the coil of the contactor to be electrified by receiving an external signal, so as to switch the working state of the load network. According to the utility model, the working state of the load network is controlled by intermittently exciting the contactor to be electrified through the switching loop, so that a maintainer is prevented from directly contacting the shell of the maintenance power box, and the electric shock prevention effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power maintenance, and particularly relates to an anti-electric leakage circuit for overhauling a power supply box. Background Technique

[0002] In large enterprise office buildings, main transformers, 110 kV equipment areas, 35 kV equipment areas, 10 kV high-voltage rooms, main control rooms and other areas are generally equipped with overhaul power supply boxes to facilitate the daily maintenance of relevant area circuits by maintenance personnel. At present, after the commonly used overhaul power supply boxes in coal enterprises are used for a period of time, the phenomenon of terminal aging often occurs. During the inspection process, daily maintenance personnel need to check the wiring in the overhaul power supply box one by one through hand-held electric tools, and electric shock accidents may occur to the daily maintenance personnel during the overhaul. Content of the Utility Model

[0003] In order to solve the problem that during the inspection process, daily maintenance personnel need to check the wiring in the overhaul power supply box one by one through hand-held electric tools, and electric shock accidents may occur to the daily maintenance personnel during the overhaul as described in the background technique, the utility model proposes the following technical solutions:

[0004] An anti-electric leakage circuit for overhauling a power supply box includes: a main switch, a switching circuit, a contactor and a load network; one end of the main switch is connected to a three-phase power supply, and the other end of the main switch is connected to the load network; the switching circuit is connected in parallel with the load network, and the coil of the contactor is arranged in the switching circuit; the normally open point of the contactor is arranged at the connection between the main switch and the load network; the load network includes a plurality of three-phase sockets connected in parallel and a plurality of single-phase sockets connected in parallel, the three-phase sockets are connected to the normally open point of the contactor through a first circuit breaker, and the single-phase sockets are connected to the normally open point of the contactor through a second circuit breaker; the switching circuit intermittently energizes the coil of the contactor by receiving an external signal, thereby switching the working state of the load network.

[0005] Wherein, the switching circuit includes: an adapter, a sensor and a relay; the adapter is respectively connected to the three-phase power supply and the sensor to supply power to the sensor; the sensor is connected to the induction coil of the relay, and the normally open point of the relay is connected in series with the coil of the contactor; when the sensor receives an external signal, the normally open point of the relay closes, and the coil of the contactor is energized.

[0006] Further, a power connection indicator light is arranged in each of the three-phase sockets and each of the single-phase sockets.

[0007] Further, the switching circuit further includes a plurality of power indicators, and each of the power indicators is activated respectively after the adapter is powered on.

[0008] Further, a leakage protector is provided in each of the single-phase sockets.

[0009] Beneficial effects: The utility model intermittently energizes the contactor through the switching circuit to control the working state of the load network, thereby preventing maintenance personnel from directly contacting the outer shell of the maintenance power supply box, and thus achieving the effect of preventing electric shock. Description of the Drawings

[0010] Figure 1 FIG. is a schematic diagram of a leakage-proof circuit for a maintenance power supply box according to an embodiment of the utility model. Detailed Embodiments

[0011] In order to make the objectives, technical solutions and advantages of the present application clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0012] It should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this patent.

[0013] Figure 1 FIG. is a schematic diagram of a leakage-proof circuit for a maintenance power supply box according to an embodiment of the utility model.

[0014] Refer to Figure 1 According to an embodiment of the present utility model, a leakage-proof circuit for a maintenance power supply box includes: a main switch 1, a switching circuit 2, a contactor 3, and a load network 4. One end of the main switch 1 is connected to a three-phase power supply 5, and the other end of the main switch 1 is connected to the load network 4. The switching circuit 2 is connected in parallel with the load network 4, and the coil of the contactor 3 is disposed in the switching circuit 2; the normally open point of the contactor 3 is disposed at the connection between the main switch 1 and the load network 4. The load network 4 includes a plurality of three-phase sockets 41 connected in parallel and a plurality of single-phase sockets 42 connected in parallel. The three-phase sockets 41 are connected to the normally open point of the contactor 3 through a first circuit breaker, and the single-phase sockets 42 are connected to the normally open point of the contactor 3 through a second circuit breaker. The switching circuit 2 energizes the coil of the contactor 3 by receiving an external signal, thereby switching the working state of the load network 4.

[0015] Specifically, the switching circuit 2 includes: an adapter 21, a sensor 22, and a relay 23. Among them, the adapter 21 is respectively connected to the three-phase power supply 5 and the sensor 22 to supply power to the sensor 22. The sensor 22 is connected to the induction coil of the relay 23, and the normally open contact of the relay 23 is connected in series with the coil of the contactor 3. When the sensor 22 receives an external signal, the normally open contact of the relay 23 closes, thereby exciting the coil of the contactor 3 to conduct electricity.

[0016] In this embodiment, the sensor 22 uses an IC card controller. Among them, the IC card controller is powered by the adapter 21, and power indicator lights 7 corresponding to the three-phase power supply 5 one by one are also provided in the switching circuit 2. When the main switch 1 is closed, the IC card controller starts to operate, and each power indicator light 7 lights up respectively. In order to further improve the recognition of the power-on state of the power supply, the colors of each power indicator light 7 can be different to distinguish the conduction conditions of each phase of the power supply. When the maintenance personnel activate the IC card controller through an authorized IC card, the IC card provides an external signal for the IC card controller, thereby causing the coil of the relay 23 to be electrified. After the induction coil of the relay 23 is electrified, the normally open contact of the relay 23 closes, and then the coil of the contactor 3 is excited to be electrified, whereby the normally open contact of the contactor 3 closes and the load network 4 conducts electricity.

[0017] When the maintenance personnel activate the IC card controller again through an authorized IC card, the IC card controller stops supplying current to the coil of the relay 23. The loss of power of the induction coil of the relay 23 drives the normally open contact of the relay 23 to open, and then the coil of the contactor 3 loses power, and the normally open contact of the contactor 3 opens, thereby disconnecting the connection between the load network 4 and the three-phase power supply 5.

[0018] In addition, in this embodiment, a leakage protector 8 is provided in each single-phase socket 42, and a corresponding leakage protector 8 is also provided in one of the three-phase sockets 41. In order to further prevent sudden leakage accidents during the maintenance process, power connection indicator lights 6 are provided in each three-phase socket 41 and each single-phase socket 42. The maintenance personnel can judge whether there is a leakage situation in the corresponding socket through the states of the respective power connection indicator lights 6.

[0019] In summary, the utility model controls the working state of the load network by intermittently exciting the contactor to be electrified through the switching circuit, thereby preventing the maintenance personnel from directly contacting the outer shell of the maintenance power supply box, and thus achieving the effect of preventing electric shock.

[0020] The specific embodiments of the utility model are described above. Other embodiments are within the scope of the appended claims.

[0021] As used throughout this specification, the terms "exemplary", "example", etc. mean "serving as an example, instance, or illustration", and do not mean "preferred" or "advantageous" over other embodiments. For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technology may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described embodiments.

[0022] The optional implementation manners of the embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present utility model are not limited to the specific details in the above implementation manners. Within the scope of the technical concept of the embodiments of the present utility model, various simple modifications can be made to the technical solutions of the embodiments of the present utility model, and these simple modifications all fall within the protection scope of the embodiments of the present utility model.

[0023] The above description of the content of this specification is provided to enable any ordinary person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification are obvious to those of ordinary skill in the art, and the general principles defined herein can also be applied to other variations without departing from the protection scope of the content of this specification. Therefore, the content of this specification is not limited to the examples and designs described herein, but is consistent with the broadest scope that conforms to the principles and novel features disclosed herein.

Claims

1. A leakage protection circuit for repairing a power supply box, characterized in that: include: A main switch (1), a switching circuit (2), a contactor (3) and a load network (4); one end of the main switch (1) is connected to a three-phase power supply (5), and the other end of the main switch (1) is connected to the load network (4); the switching circuit (2) and the load network (4) are connected in parallel, and the coil of the contactor (3) is arranged in the switching circuit (2); the normally open point of the contactor (3) is arranged at the connection between the main switch (1) and the load network (4); the load network (4) comprises a plurality of three-phase sockets (41) connected in parallel and a plurality of single-phase sockets (42) connected in parallel, the three-phase sockets (41) are connected to the normally open point of the contactor (3) through a first circuit breaker, and the single-phase sockets (42) are connected to the normally open point of the contactor (3) through a second circuit breaker; the switching circuit (2) intermittently excites the coil induction of the contactor (3) by receiving an external signal, thereby switching the working state of the load network (4).

2. According to the anti-leakage circuit for repairing a power supply box as described in claim 1, it is characterized in that: The switching circuit (2) comprises: an adapter (21), a sensor (22) and a relay (23); the adapter (21) is connected to the three-phase power supply (5) and the sensor (22) respectively, so as to supply power to the sensor (22); the sensor (22) and the induction coil of the relay (23) are connected, and the normally open point of the relay (23) is connected in series with the coil of the contactor (3); when the sensor (22) receives an external signal, the normally open point of the relay (23) is closed, and the coil of the contactor (3) is energized.

3. According to the anti-leakage circuit for repairing a power supply box as described in claim 1, it is characterized in that: Each of the three-phase sockets (41) and each of the single-phase sockets (42) is provided with a power-on indicator light (6).

4. According to the anti-leakage circuit for repairing a power supply box as described in claim 2, it is characterized in that: The switching circuit (2) further comprises a plurality of power indicator lights (7). When the adapter (21) is powered on, each of the power indicator lights (7) is activated.

5. According to the anti-leakage circuit for repairing a power supply box as described in claim 2, it is characterized in that: Each of the single-phase sockets (42) is provided with a leakage protector (8).

Images