Quick switching device for double-medium-voltage transmission system

Abstract

A quick switching device of a double-medium-voltage transmission system relates to the technical field of medium-voltage transmission equipment and comprises a first medium-voltage transmission device and a second medium-voltage transmission device which are arranged in parallel, and a power switching device is arranged at the front wire inlet ends of the first medium-voltage transmission device and the second medium-voltage transmission device. A motor output switching device is arranged at the output end of the rear end of the first medium-voltage transmission device and the output end of the rear end of the second medium-voltage transmission device, and the output end of the motor output switching device is connected with a motor. The two groups of electric cabinets can be switched between the two sets of medium-voltage transmission systems, so that quick switching between the medium-voltage transmission system and the standby transmission system is realized, power supply output is performed only when the front end and the rear end are switched uniformly and synchronously, and wrong line connection and equipment damage caused by misoperation are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of double medium voltage transmission system quick switching device, and it is related to medium voltage transmission equipment technical field. BACKGROUND

[0002] Medium voltage transmission system is a kind of system that can carry out electric energy conversion and transmission in medium voltage range (usually hundreds of volts to thousands of volts).

[0003] In production manufacturing industry, one end of medium voltage transmission system is connected to power supply, and the other end is connected to load, such as driving motor by power supply, in order to ensure the continuity of production, prevent medium voltage transmission system failure when it takes a long time to repair, so double medium voltage transmission system is adopted, that is, two sets of medium voltage transmission system are connected to load, two sets of medium voltage transmission system are standby for each other, when one set of system has a problem, the other set needs to be switched within 30 minutes, so as to effectively ensure the continuity of production and improve production efficiency, but the existing double medium voltage transmission system is complex in operation when switching, and the switching is high in synchronism when the same brand of medium voltage transmission system is switched, while two sets of medium voltage transmission system of different brands need to be debugged more, and the switching efficiency is not high. SUMMARY

[0004] The utility model aims at the defects or deficiencies in prior art, and provides a kind of double medium voltage transmission system quick switching device, by being provided with incoming line switching electric cabinet and motor power supply switching electric cabinet in the front and rear end of two sets of medium voltage transmission system, two groups of electric cabinets can be switched in two sets of medium voltage transmission system, so as to realize the quick switching of working medium voltage transmission system and standby transmission system, only when front and rear end are uniformly switched synchronously, power supply output is carried out, to prevent line error connection caused by misoperation, damage to equipment.

[0005] To achieve the above object, the utility model adopts the following technical scheme: it includes first medium voltage transmission device 1, second medium voltage transmission device 2, first medium voltage transmission device 1 and second medium voltage transmission device 2 are arranged side by side, power supply switching device 5 is provided at the incoming line end of the front end of first medium voltage transmission device 1 and second medium voltage transmission device 2, motor output switching device 6 is provided at the output end of the rear end of first medium voltage transmission device 1 and second medium voltage transmission device 2, and the output end of motor output switching device 6 is connected with motor 4.

[0006] Further, the first medium voltage transmission device 1 includes working transmission armature 11 and working transmission excitation 12.

[0007] Further, the second medium voltage transmission device 2 includes standby transmission armature 21 and standby transmission excitation 22.

[0008] Further, the power switching device 5 is a transmission line power supply switching cabinet, including a transmission armature power supply switching cabinet 51 and a transmission excitation power supply switching cabinet 52.

[0009] Further, the transmission armature power supply switching cabinet 51 is provided with an armature switching knife switch 53 at the output end, and the transmission excitation power supply switching cabinet 52 is provided with an excitation switching knife switch 54 at the output end. The transmission armature power supply switching cabinet 51 corresponds to the in-use transmission armature 11 and the standby transmission armature 21 through the armature switching knife switch 53, and the transmission excitation power supply switching cabinet 52 corresponds to the in-use transmission excitation 12 and the standby transmission excitation 22 through the excitation switching knife switch 54.

[0010] Further, the motor output switching device 6 is a motor power supply switching cabinet, including a motor armature switching cabinet 61 and a motor excitation switching cabinet 62. The motor armature switching cabinet 61 corresponds to the in-use transmission armature 11 and the standby transmission armature 21, and the motor excitation switching cabinet 62 corresponds to the in-use transmission excitation 12 and the standby transmission excitation 22.

[0011] Further, the motor armature switching cabinet 61 is provided with a motor armature power supply switching knife switch 63 at the input end, and the motor excitation switching cabinet 62 is provided with a motor power supply excitation switching knife switch 64 at the input end. The motor armature switching cabinet 61 corresponds to the in-use transmission armature 11 and the standby transmission armature 21 through the motor armature power supply switching knife switch 63, and the motor excitation switching cabinet 62 corresponds to the in-use transmission excitation 12 and the standby transmission excitation 22 through the motor power supply excitation switching knife switch 64.

[0012] Further, the power switching device 5 is provided with a line power supply 3 at the input end.

[0013] Further, the power switching device 5 is provided with a switch secondary switching circuit, which is provided with an isolation switch, a live display, a knife switch electromagnetic lock, a front and rear door electromagnetic lock, an intermediate relay, a fuse, a knife switch electromagnetic lock interlock, two groups of knife switch electromagnetic locks, and an intermediate relay and a knife switch electromagnetic lock interlock. One group corresponds to the armature switching knife switch 53 and the motor armature power supply switching knife switch 63, and the other group corresponds to the excitation switching knife switch 54 and the motor power supply excitation switching knife switch 64.

[0014] The utility model discloses the beneficial effect is: through setting up incoming line switching electric cabinet and motor power supply switching electric cabinet in two sets of medium voltage transmission system front and rear end, two groups of electric cabinets can switch in two sets of medium voltage transmission system, thereby realizing the quick switching of in use medium voltage transmission system and spare transmission system, only when the front and rear end unified synchronous switching carries out power supply output, prevents the line error connection due to the misoperation, causes the damage to the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0016] Figure 1 It is the frame structure schematic diagram of the utility model;

[0017] Figure 2 It is the transmission armature power supply switching principle schematic diagram in the utility model;

[0018] Figure 3 It is the transmission excitation power supply switching principle schematic diagram in the utility model;

[0019] Figure 4 It is the switch secondary switching principle schematic diagram in the utility model.

[0020] Figure legend explains: first medium voltage transmission device 1, second medium voltage transmission device 2, incoming line power supply 3, motor 4, power supply switching device 5, motor output switching device 6, in use transmission armature 11, in use transmission excitation 12, spare transmission armature 21, spare transmission excitation 22, armature power supply switching switch cabinet 51, transmission excitation power supply switching cabinet 52, armature switching knife gap 53, excitation switching knife gap 54, motor armature switching switch cabinet 61, motor excitation switching switch cabinet 62, motor armature power supply switching knife gap 63, motor power supply excitation switching knife gap 64. DETAILED DESCRIPTION

[0021] Reference Figures 1-4The technical scheme adopted by the embodiment is shown as follows: it comprises a first medium voltage transmission device 1 and a second medium voltage transmission device 2, the first medium voltage transmission device 1 and the second medium voltage transmission device 2 are arranged side by side, the first medium voltage transmission device 1 and the second medium voltage transmission device 2 are provided with a power supply switching device 5 at the front end of the power supply input end, the first medium voltage transmission device 1 and the second medium voltage transmission device 2 are provided with a motor output switching device 6 at the rear end of the output end, the motor output switching device 6 is connected with the motor 4, in the embodiment, the power supply switching device is arranged at the power supply input end of the two sets of medium voltage transmission devices, the motor output switching device is arranged at the power supply output end and connected with the motor, the first medium voltage transmission device is taken as an example of the in-use equipment, the second medium voltage transmission device is taken as an example of the standby equipment, in normal use, the power supply switching device is connected with the first medium voltage transmission device, the first medium voltage transmission device is connected with the motor output switching device, the motor is controlled by the first medium voltage transmission device, the second medium voltage transmission device is not provided with a power supply circuit and is in an open circuit state, when the first medium voltage transmission device fails, the power supply switching device is connected with the second medium voltage transmission device, the motor output switching device is connected with the second medium voltage transmission device, at this time, the motor is controlled by the second medium voltage transmission device, the first medium voltage transmission device can be repaired, the switching device arranged at the power supply input end and the output end of the two sets of medium voltage transmission devices can quickly and effectively switch the in-use equipment and the standby equipment, the operation is simple, the continuity of production can be more effectively ensured, the time for switching the equipment is reduced, and the production efficiency is improved.

[0022] More specifically, the first medium voltage transmission device 1 comprises an in-use transmission armature 11 and an in-use transmission excitation 12, the second medium voltage transmission device 2 comprises a standby transmission armature 21 and a standby transmission excitation 22, in the embodiment, the two sets of medium voltage transmission devices both comprise a transmission armature and a transmission excitation part, the motor armature and the motor excitation are synchronously controlled, when the switching operation is performed, the two parts of the same medium voltage transmission device are simultaneously connected to realize circuit conduction, that is, to prevent misoperation, and it is convenient for the operator to judge the running state of the equipment, it can be understood that the indication lamps are arranged on the two transmission devices to observe the switching condition, and the transmission devices are also provided with a lighting system to facilitate the operator to use the equipment.

[0023] More specifically, the power switching device 5 is a transmission line power supply switching cabinet, including a transmission armature power supply switching cabinet 51 and a transmission excitation power supply switching cabinet 52. The transmission armature power supply switching cabinet 51 corresponds to the in-use transmission armature 11 and the standby transmission armature 21, and the transmission excitation power supply switching cabinet 52 corresponds to the in-use transmission excitation 12 and the standby transmission excitation 22. In this embodiment, the switching device is an electric control cabinet, and the operator can easily perform switching operation. That is, the power switching device includes two electric control cabinets, one is a transmission armature power supply switching cabinet, and the other is a transmission excitation power supply switching cabinet. Both of them correspond to the first and second medium voltage transmission devices. Specifically, the transmission armature power supply switching cabinet corresponds to the in-use transmission armature and the standby transmission armature, and the transmission excitation power supply switching cabinet corresponds to the in-use transmission excitation and the standby transmission excitation. By switching the in-use and standby devices, it should be noted that when performing switching operation, it is necessary to ensure that it is connected to the in-use device or the standby device at the same time, so that the control circuit is in a conduction state, otherwise both sets of devices are in an open circuit state.

[0024] When the transmission armature power supply switching cabinet is connected to the in-use transmission armature, the common armature power supply device of the first medium voltage transmission device supplies power to the in-use medium voltage transmission armature, and the power supply of the other set of armature primary circuit is automatically disconnected and interlocked to prevent live operation.

[0025] When the transmission excitation power supply switching cabinet is connected to the in-use transmission excitation, the common excitation power supply device of the first medium voltage transmission device supplies power to the in-use medium voltage transmission excitation, and the power supply of the other set of excitation primary circuit is automatically disconnected and interlocked to prevent live operation. Both are in a conduction state to control the output of the motor.

[0026] More specifically, the transmission armature power supply switching cabinet 51 is provided with an armature switching knife switch 53 at the output end, and the transmission excitation power supply switching cabinet 52 is provided with an excitation switching knife switch 54 at the output end. The transmission armature power supply switching cabinet 51 corresponds to the in-use transmission armature 11 and the standby transmission armature 21 through the armature switching knife switch 53, and the transmission excitation power supply switching cabinet 52 corresponds to the in-use transmission excitation 12 and the standby transmission excitation 22 through the excitation switching knife switch 54. In this embodiment, the switching operation is realized by the switching knife switch. When the knife switch is closed to the in-use device end, the in-use device is powered on, and when the knife switch is closed to the standby device end, the standby device is powered on. The overall structure is simple and easy to operate, which can greatly improve the switching operation when the device fails. The knife switch structure is more convenient to judge the switching state than other switching switches, and it is more convenient to repair and replace when a fault occurs.

[0027] More specifically, the motor output switching device 6 is a motor power supply switching cabinet, including motor armature switching switch cabinet 61, motor excitation switching switch cabinet 62, motor armature switching switch cabinet 61 corresponds to the in-use transmission armature 11, the standby transmission armature 21, the motor excitation switching switch cabinet 62 corresponds to the in-use transmission excitation 12, the standby transmission excitation 22, in this embodiment, the motor armature switching switch cabinet is the motor armature power supply, through the switching knife gap, the in-use medium voltage transmission armature power supply is realized to the motor armature, the motor armature primary circuit of the other set of medium voltage transmission armature is automatically disconnected, and interlocking is realized; the motor excitation switching switch cabinet is the power supply for the motor excitation, through the switching knife gap, the in-use medium voltage transmission excitation power supply is realized to the motor excitation, the motor excitation primary circuit of the other set of medium voltage transmission excitation is automatically disconnected, and interlocking is realized.

[0028] More specifically, the motor armature switching switch cabinet 61 input end is provided with motor armature power supply switching knife gap 63, and the motor excitation switching switch cabinet 62 input end is provided with motor power supply excitation switching knife gap 64; the motor armature switching switch cabinet 61 corresponds to the in-use transmission armature 11 and the standby transmission armature 21 through the motor armature power supply switching knife gap 63, and the motor excitation switching switch cabinet 62 corresponds to the in-use transmission excitation 12 and the standby transmission excitation 22 through the motor power supply excitation switching knife gap 64; in this embodiment, the connection switching of the motor output switching device is realized through a switching knife gap, which is the same as the principle structure of the power supply switching device.

[0029] More specifically, the input end of the power supply switching device 5 is provided with an incoming power supply 3, and the power supply switching device is connected with the incoming power supply. After switching according to the needs, the incoming power supply is connected with the first medium voltage transmission device or the second medium voltage transmission device.

[0030] More specifically, the power switching device 5 is provided with a switch secondary switching circuit, and the switch secondary switching circuit is provided with an isolation switch, a live display, a knife switch electromagnetic lock, a front and rear door electromagnetic lock, an intermediate relay, a fuse, a knife switch electromagnetic lock interlock, two groups of knife switch electromagnetic locks, a middle relay, and a knife switch electromagnetic lock interlock.

[0031] The working principle of the utility model is: two sets of front end of medium voltage transmission device are connected with incoming line power supply 3 through power switching device 5 and then switching control is carried out, and the output end carries out switching control to motor 4 through motor output switching device 6 and carries out power supply, one set is in-use medium voltage transmission device, and one set is standby medium voltage transmission device, and taking first medium voltage transmission device 1 as in-use medium voltage transmission device as an example, when normally operating, armature switching knife switch 53 is closed on in-use transmission armature 11, motor armature power supply switching knife switch 63 is also closed on in-use transmission armature 11, excitation switching knife switch 54 is closed on in-use transmission excitation 12, and motor power supply excitation switching knife switch 64 is also closed on in-use transmission excitation 12, at this moment, the power supply loop of second medium voltage transmission device 2 is disconnected, the knife switch electromagnetic lock is locked, incoming line power supply 3 cannot be automatically switched to be connected with second medium voltage transmission device 2, and misoperation is prevented, so that first medium voltage transmission device 1 is controlled to carry out power supply to motor 4, when first medium voltage transmission device 1 fails, then armature switching knife switch 53 is closed on standby transmission armature 21, excitation switching knife switch 54 is also closed on standby transmission armature 21, excitation switching knife switch 54 is closed on standby transmission excitation 22, and motor power supply excitation switching knife switch 64 is also closed on standby transmission excitation 22, at this moment, the power supply loop of first medium voltage transmission device 1 is disconnected, and the circuit loop of second medium voltage transmission device 2 is conducted, first medium voltage transmission device 1 is locked, and only when the knife switch is closed on the same medium voltage transmission device, the power supply loop is conducted, so that misoperation can be prevented.

[0032] The above merely aims to explain the technical scheme of the present application and is not intended to limit the present application. Other modifications or equivalent replacements made by those skilled in the art to the technical scheme of the present application, as long as they do not depart from the spirit and scope of the present application, should be included in the scope of the claims of the present application.

Claims

1. A dual medium voltage drive system fast switching device, characterized by: It includes first medium voltage transmission device (1), second medium voltage transmission device (2), first medium voltage transmission device (1) and second medium voltage transmission device (2) are arranged side by side, the front end of first medium voltage transmission device (1), second medium voltage transmission device (2) is provided with power switching device (5), the rear end of first medium voltage transmission device (1), second medium voltage transmission device (2) is provided with motor output switching device (6), and the output end of motor output switching device (6) is connected with motor (4).

2. The quick switching device of a dual medium voltage drive system according to claim 1, characterized in that: The first medium voltage transmission device (1) includes in-use transmission armature (11) and in-use transmission excitation (12).

3. The quick switching device of dual medium voltage drive system according to claim 1, characterized in that: The second medium voltage transmission device (2) includes standby transmission armature (21) and standby transmission excitation (22).

4. The quick switching device of dual medium voltage drive system according to claim 1, characterized in that: The power switching device (5) is a transmission incoming line power supply switching cabinet, which includes transmission armature power supply switching cabinet (51) and transmission excitation power supply switching cabinet (52), the transmission armature power supply switching cabinet (51) corresponds to the in-use transmission armature (11) and the standby transmission armature (21), and the transmission excitation power supply switching cabinet (52) corresponds to the in-use transmission excitation (12) and the standby transmission excitation (22).

5. The quick switching device of a dual medium voltage drive system according to claim 4, characterized in that: The output end of the transmission armature power supply switching cabinet (51) is provided with an armature switching knife switch (53), the output end of the transmission excitation power supply switching cabinet (52) is provided with an excitation switching knife switch (54), the transmission armature power supply switching cabinet (51) corresponds to the in-use transmission armature (11) and the standby transmission armature (21) through the armature switching knife switch (53), and the transmission excitation power supply switching cabinet (52) corresponds to the in-use transmission excitation (12) and the standby transmission excitation (22) through the excitation switching knife switch (54).

6. The dual medium voltage drive system fast switching device of claim 1, wherein: The motor output switching device (6) is a motor power supply switching cabinet, which includes motor armature switching cabinet (61) and motor excitation switching cabinet (62), the motor armature switching cabinet (61) corresponds to the in-use transmission armature (11) and the standby transmission armature (21), and the motor excitation switching cabinet (62) corresponds to the in-use transmission excitation (12) and the standby transmission excitation (22).

7. The quick switching device of a dual medium voltage drive system according to claim 6, characterized in that: The input end of the motor armature switching cabinet (61) is provided with a motor armature power supply switching knife switch (63), the input end of the motor excitation switching cabinet (62) is provided with a motor power supply excitation switching knife switch (64), the motor armature switching cabinet (61) corresponds to the in-use transmission armature (11) and the standby transmission armature (21) through the motor armature power supply switching knife switch (63), and the motor excitation switching cabinet (62) corresponds to the in-use transmission excitation (12) and the standby transmission excitation (22) through the motor power supply excitation switching knife switch (64).

8. The dual medium voltage drive system fast switching device of claim 1, wherein: The input end of the power switching device (5) is provided with an incoming line power supply (3).

9. The dual medium voltage drive system fast switching device of claim 1, wherein: The power switching device (5) is provided with a switch secondary switching circuit, and the switch secondary switching circuit is provided with an isolation switch, a live display, a knife gap electromagnetic lock, a front and back door electromagnetic lock, an intermediate relay, a fuse, a knife gap electromagnetic lock interlock, and two groups of the knife gap electromagnetic lock.

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