High-voltage cabinet circuit breaker handcart not-in-place alarm and switch-off closing loop device

Abstract

The utility model belongs to the technical field of electric control of high-voltage circuit breakers, and aims to solve the problem that accidents are easily caused in a high-voltage power transmission or power failure process because a handcart does not run to a working position or an experimental position. The utility model provides a high-voltage cabinet circuit breaker handcart not-in-place alarm and switch-off closing loop device. A coil of an experiment position relay J1 and a main normally-closed contact of an experiment position travel switch S8 are connected in series to form a first circuit; a coil of the working position relay J2 is connected in series with a normally closed contact of the working position travel switch S9 to form a second circuit; a normally open contact of the experimental position relay J1, a normally open contact of the working position relay J2 and an alarm indicator lamp XD are connected in series to form a third circuit; the first circuit, the second circuit and the third circuit are connected in parallel at two ends of the control miniature bus power supply; and a normally closed contact of the working position relay J2 is arranged on a closing loop of the high-voltage cabinet circuit breaker. When the circuit breaker handcart is not in place, the device can timely send out a sound-light alarm signal and cut off a closing loop.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage circuit breaker electric control, and particularly relates to a device for alarming when the circuit breaker trolley of a high-voltage cabinet is not in place and disconnecting the closing and tripping circuits. Background Art

[0002] High-voltage cabinets are commonly used switch cabinets in power substations, and they are the main equipment for connecting and disconnecting high-voltage power sources. In high-voltage switch cabinets, it is necessary to connect and disconnect high-voltage power sources under load. The high-voltage circuit breaker is the main component for connecting and disconnecting high-voltage power sources in high-voltage switch cabinets. Currently, most of the high-voltage circuit breakers in use adopt operating trolleys. The circuit breaker trolley in the high-voltage switch cabinet is manually pushed into the working position through operation, and the power supply of the closing coil of the circuit breaker is connected. The circuit breaker closes to connect the high-voltage power source; when it is necessary to disconnect the high-voltage power source, the power supply of the tripping coil of the circuit breaker is connected, the circuit breaker trips, and then the circuit breaker trolley is manually pulled out to the test position through operation.

[0003] When the circuit breaker trolley of the high-voltage switch cabinet is manually pushed into the working position or pulled out to the test position, if the circuit breaker trolley does not reach the proper position during this process, that is, the trolley does not reach the working position or the test position, it is very likely to cause accidents during the process of high-voltage power transmission or power outage. At present, there is a lack of means to warn against and avoid this potential safety hazard. Content of the Utility Model

[0004] In order to solve at least one of the above technical problems existing in the prior art, the utility model provides a device for alarming when the circuit breaker trolley of a high-voltage cabinet is not in place and disconnecting the closing and tripping circuits.

[0005] The utility model is implemented by adopting the following technical scheme: A device for alarming when the circuit breaker trolley of a high-voltage cabinet is not in place and disconnecting the closing and tripping circuits includes a test position relay J1, a working position relay J2, a test position travel switch S8, a working position travel switch S9, and an alarm indicator XD;

[0006] Among them, the coil of the test position relay J1 is connected in series with the main normally closed contact of the test position travel switch S8 to form a first circuit; the coil of the working position relay J2 is connected in series with the normally closed contact of the working position travel switch S9 to form a second circuit; the normally open contacts of the test position relay J1, the normally open contact of the working position relay J2, and the alarm indicator XD are connected in series to form a third circuit; the first circuit, the second circuit, and the third circuit are connected in parallel at both ends of the control busbar power supply;

[0007] A normally closed contact of the working position relay J2 is provided on the closing circuit of the high-voltage cabinet circuit breaker.

[0008] Preferably, the auxiliary normally closed contact of the test position travel switch S8 and the normally open contact of the working position travel switch S9 are respectively connected to the 3# input terminal and the 4# input terminal of the high-voltage switchgear circuit breaker position and status display device KZQ.

[0009] Preferably, one end of the normally closed contact of the working position relay J2 is sequentially connected to one end of the power supply of the control busbar through the protection device DMR201P, the closing switch KK12, and the closing and opening power supply switch ZK, and the other end of the normally closed contact of the working position relay J2 is connected to the other end of the power supply of the control busbar through the closing release HQ of the high-voltage switchgear circuit breaker DL;

[0010] One end of the opening release TQ of the high-voltage switchgear circuit breaker DL is sequentially connected to one end of the power supply of the control busbar through the protection device DMR201P, the opening switch KK34, and the closing and opening power supply switch ZK, and the other end of the opening release TQ of the high-voltage switchgear circuit breaker DL is connected to the other end of the power supply of the control busbar.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] When the circuit breaker trolley is not in place at the working position, the device can timely send out an audible and visual alarm signal, and at the same time cut off the closing circuit and cannot close, preventing poor contact between the moving and static contacts of the circuit breaker during closing, burning out the moving and static contacts of the circuit breaker, and preventing large currents passing through the moving and static contacts of the circuit breaker, causing arc short-circuit, arc grounding and other accidents. When the circuit breaker trolley is not in place, it can timely send out an audible and visual alarm signal to prevent harm to the line maintenance personnel. The audible and visual alarm can timely remind the operator that the circuit breaker is not in place, preventing casualties, equipment damage, etc., and ensuring the safety of personnel and equipment. This device uses fewer components and has a low cost. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 is the circuit diagram (the first part) of this embodiment;

[0015] Figure 2 is the circuit diagram (the second part) of this embodiment. Detailed Embodiments

[0016] In combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present utility model.

[0017] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should fall within the scope covered by the technical content disclosed by the present utility model. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0018] The present utility model provides an embodiment:

[0019] As Figure 2 shown, a device for alarming when the circuit breaker trolley of a high-voltage cabinet is not in place and disconnecting and closing the circuit, which is characterized in that:

[0020] It includes an experimental position relay J1, a working position relay J2, an experimental position travel switch S8, a working position travel switch S9 and an alarm indicator XD; wherein the coil of the experimental position relay J1 is connected in series with the main normally closed contact of the experimental position travel switch S8 to form a first circuit; the coil of the working position relay J2 is connected in series with the normally closed contact of the working position travel switch S9 to form a second circuit; the normally open contacts of the experimental position relay J1, the normally open contacts of the working position relay J2 and the alarm indicator XD are connected in series to form a third circuit; the first circuit, the second circuit and the third circuit are connected in parallel at both ends of the control busbar power supply; a normally closed contact of the working position relay J2 is provided on the closing circuit of the high-voltage cabinet circuit breaker.

[0021] The present invention Figure 1 additionally designs and installs two relays and an alarm indicator XD in the

[0022] In this embodiment, as Figure 1As shown in the figure, one end of the normally closed contact of the working position relay J2 is sequentially connected to one end of the power supply of the control busbar through the protection device DMR201P, the closing switch KK12, and the closing and opening power switch ZK. The other end of the normally closed contact of the working position relay J2 is connected to the other end of the power supply of the control busbar through the closing release HQ of the high-voltage cabinet circuit breaker DL; in the figure, DK1 and DK2 are the power switches of the control circuit;

[0023] One end of the opening release TQ of the high-voltage cabinet circuit breaker DL is sequentially connected to one end of the power supply of the control busbar through the protection device DMR201P, the opening switch KK34, and the closing and opening power switch ZK. The other end of the opening release TQ of the high-voltage cabinet circuit breaker DL is connected to the other end of the power supply of the control busbar. The auxiliary normally closed contact of the test position travel switch S8 and the normally open contact of the working position travel switch S9 are respectively connected to the 3# input terminal and the 4# input terminal of the high-voltage cabinet circuit breaker position and status display device KZQ.

[0024] Working principle:

[0025] Close the power switches DK1 and DK2 of the control circuit. The protection device DMR201P is powered on, and the control circuit is powered on. Close the closing and opening power switch ZK12. When the circuit breaker trolley of the high-voltage switch cabinet is manually pushed into the working position, the normally open contact of the travel switch S9 closes. The display device KZQ indicates that the circuit breaker trolley is in the working position. At the same time, the normally closed contact of the travel switch S9 opens, the working position relay J2 is released, the normally closed contact of the working position relay J2 in the closing circuit closes to connect the closing circuit, and the normally open contact of the working position relay J2 in the sound and light alarm circuit opens, and the alarm indicator XD does not work;

[0026] After the high-voltage switch cabinet circuit breaker is tripped and the circuit breaker trolley is manually pulled out to the test position, the auxiliary normally closed contact of the travel switch S8 opens, the display device KZQ indicates the test position of the circuit breaker trolley, the normally closed contact of the travel switch S8 opens, the test position relay J1 is released, the normally open contact of the test position relay J1 in the sound and light alarm circuit opens, and the alarm indicator XD does not work.

[0027] When the circuit breaker trolley is manually pushed into the working position but not in place, the normally closed contact of the travel switch S9 does not open, the working position relay J2 is energized, the normally closed contact of the working position relay J2 in the closing circuit opens the closing circuit, so that the circuit breaker cannot be closed, and the normally open contact of the working position relay J2 in the sound and light alarm circuit closes. Since the circuit breaker trolley leaves the test position, the normally closed contact of the travel switch S8 remains closed, the test position relay J1 is energized, the normally open contact of the test position relay J1 in the sound and light alarm circuit closes, and the alarm indicator XD is powered on to emit a sound and light alarm signal;

[0028] When the circuit breaker is tripped, if the circuit breaker trolley is manually operated and pulled out to the test position but not in place, the normally closed contact of the travel switch S8 is not disconnected, the test position relay J1 is energized, and the normally open contact of the test position relay J1 in the sound and light alarm circuit is closed. Since the circuit breaker trolley leaves the working position, the normally closed contact of the travel switch S9 is closed, the working position relay J2 is energized, and the normally open contact of the working position relay J2 in the sound and light alarm circuit is closed, and the alarm indicator XD is energized to send out a sound and light alarm signal.

[0029] As described above, the above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A device for alarming when the circuit breaker trolley of a high-voltage cabinet is not in place and disconnecting the closing and tripping circuits, characterized in that: It includes an experimental position relay J1, a working position relay J2, an experimental position travel switch S8, a working position travel switch S9, and an alarm indicator XD; Among them, the coil of the experimental position relay J1 is connected in series with the main normally closed contact of the experimental position travel switch S8 to form a first circuit; the coil of the working position relay J2 is connected in series with the normally closed contact of the working position travel switch S9 to form a second circuit; the normally open contact of the experimental position relay J1, the normally open contact of the working position relay J2, and the alarm indicator XD are connected in series to form a third circuit; the first circuit, the second circuit, and the third circuit are connected in parallel across the control busbar power supply; A normally closed contact of the working position relay J2 is provided on the closing circuit of the high-voltage cabinet circuit breaker.

2. The device for alarming when the circuit breaker trolley of the high-voltage cabinet is not in place and disconnecting / closing the switching circuit according to claim 1, wherein: An auxiliary normally closed contact of the experimental position travel switch S8 and a normally open contact of the working position travel switch S9 are respectively connected to the 3# input terminal and the 4# input terminal of the high-voltage cabinet circuit breaker position and status display device KZQ.

3. A device for alarming when the circuit breaker trolley of a high-voltage switch cabinet is not in place and disconnecting / closing the switching circuit according to claim 1, characterized in that: One end of the normally closed contact of the working position relay J2 is sequentially connected to one end of the control busbar power supply through the protection device DMR201 P, the closing switch KK12, and the closing and tripping power switch ZK, and the other end of the normally closed contact of the working position relay J2 is connected to the other end of the control busbar power supply through the closing release HQ of the high-voltage cabinet circuit breaker DL; One end of the tripping release TQ of the high-voltage cabinet circuit breaker DL is sequentially connected to one end of the control busbar power supply through the protection device DMR201 P, the tripping switch KK34, and the closing and tripping power switch ZK, and the other end of the tripping release TQ of the high-voltage cabinet circuit breaker DL is connected to the other end of the control busbar power supply.

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