CN211606079U - Medium-voltage switch cabinet for realizing low-voltage locking of motor - Google Patents
Medium-voltage switch cabinet for realizing low-voltage locking of motor Download PDFInfo
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- CN211606079U CN211606079U CN202020303630.7U CN202020303630U CN211606079U CN 211606079 U CN211606079 U CN 211606079U CN 202020303630 U CN202020303630 U CN 202020303630U CN 211606079 U CN211606079 U CN 211606079U
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Abstract
The utility model relates to a realize medium voltage switchgear that motor low-voltage blocked, be provided with computer integrated protection device in inlet wire cabinet and the motor cabinet through at medium voltage switchgear respectively, two surveillance relays have in the PT cabinet, in order to realize having trouble monitoring action to the PT cabinet by the computer integrated protection device in the inlet wire cabinet, computer integrated protection device in the inlet wire cabinet sends drive signal through signal outlet contact and gives first switch, make first switch close, and then make the shutting generating line get electricity, it is closed again to be driven the third switch by the second computer integrated protection device of motor cabinet, thereby realize the low-voltage of motor in the motor cabinet and block. Therefore, the medium-voltage switch cabinet is simple in wiring, the using amount of cables is saved, safety risks are reduced, and locking reliability of the motor under the low-voltage condition is improved.
Description
Technical Field
The utility model relates to a cubical switchboard field especially relates to a realize medium voltage switchgear of motor low-voltage shutting.
Background
The medium-voltage switch cabinet is a common electrical device in the field of electric power, and is mainly used for realizing opening and closing, controlling and protecting the electrical device in the process of generating, transmitting, distributing and converting electric energy of an electric power system. At present, the medium-voltage switch cabinet is mainly suitable for various occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industrial textiles, industrial and mining enterprises, residential districts, high-rise buildings and the like.
In practical scenarios of the use of medium voltage switchgear, the medium voltage switchgear is usually used in conjunction with an electric motor. Motors are inductive loads and are generally required to operate at rated voltage. If the voltage supplied to the motor is too low, the relative current will rise, the windings will heat up, the motor will burn out over time, and low voltage protection is needed because the motor does not provide any power.
According to the existing relay protection setting requirements, when the secondary voltage of a voltage transformer (also called PT cabinet) is lower than 65V, a low-voltage protection loop of the motor executes protection action. However, in actual operation, equipment failures such as fuse blowout, idle trip, etc. often occur, and voltage loss malfunction is caused, and at this time, a disconnection locking device needs to be added to ensure the accuracy of the relay protection operation.
Currently, the relay protection action is ensured to be accurate mainly by expanding a disconnection latching relay in a PT cabinet. However, after the relay is locked by the expanded disconnection, the adjacent cabinets in the PT cabinet are provided with more wires, so that the safety risk is increased, and the phenomena of unreliable power connection action of the relay and the like caused by too many relays also occur.
Disclosure of Invention
The utility model aims to solve the technical problem that a medium voltage switchgear that realizes motor low-voltage shutting is provided to above-mentioned prior art.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a medium voltage switchgear for implementing low voltage lockout of an electric motor, comprising:
a power supply device;
a main bus;
the locking bus is electrically connected with the power supply device through a first switch;
a PT cabinet having a first section PT, a second section PT, a first monitoring relay for monitoring the first section PT for failure, and a second monitoring relay for monitoring the second section PT for failure;
the inlet wire cabinet is provided with a first microcomputer comprehensive protection device and a signal outlet contact, the first microcomputer comprehensive protection device is in signal connection with the first monitoring relay, the second monitoring relay and the signal outlet contact respectively, the first microcomputer comprehensive protection device is electrically connected with the main bus through a second switch, and the signal outlet contact is electrically connected with the power supply device through the first switch;
the motor cabinet is provided with a second microcomputer comprehensive protection device and a locking relay, the second microcomputer comprehensive protection device is in signal connection with the locking relay, the locking relay is electrically connected with a locking bus, and the second microcomputer comprehensive protection device is electrically connected with the main bus through a third switch.
Compared with the prior art, the utility model has the advantages of: the microcomputer comprehensive protection device in the inlet wire cabinet sends a driving signal to the first switch through a signal outlet contact, so that the first switch is closed, a locking bus is electrified, and the microcomputer comprehensive protection device of the electric cabinet drives the third switch to be closed, so that the low-voltage locking of the motor in the electric cabinet is realized. Therefore, the medium-voltage switch cabinet is simple in wiring, saves the using amount of cables, reduces safety risks and improves the locking reliability of the motor under the condition of low voltage.
Drawings
Fig. 1 is a schematic diagram of a medium voltage switchgear for implementing low voltage locking of a motor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, the present embodiment provides a medium voltage switchgear for implementing low voltage lockout of a motor, the medium voltage switchgear comprising:
a power supply device 1;
a main bus 2 of 10 KV;
a latch bus bar 3 electrically connected to the power supply device 1 through a first switch 41;
a PT cabinet 5 having a first stage PT, a second stage PT, a first monitor relay 51 for monitoring a failure of the first stage PT, and a second monitor relay 52 for monitoring a failure of the second stage PT;
an inlet cabinet 6 having a first microcomputer integrated protection device 61 and a signal outlet contact 62, wherein the first microcomputer integrated protection device 61 is in signal connection with a first monitor relay 51, a second monitor relay 52 and the signal outlet contact 62, respectively, the first microcomputer integrated protection device 61 is electrically connected with the main bus 2 through a second switch 42, and the signal outlet contact 62 is electrically connected with the power supply device 1 through a first switch 41;
the motor cabinet 7 includes a motor 71, a second microcomputer integrated protection device 72 corresponding to the motor 71, and a latching relay 73, the second microcomputer integrated protection device 72 is in signal connection with the latching relay 73, the latching relay 73 is electrically connected to the latching bus 3, and the second microcomputer integrated protection device 72 is electrically connected to the main bus 2 through the third switch 43.
Specifically, the working principle of the medium-voltage switch cabinet for realizing low-voltage locking of the motor is as follows:
the first monitor relay 51 monitors the first stage PT fault condition in the PT cabinet 5, the second monitor relay 52 monitors the second stage PT fault condition in the PT cabinet 5, and the first monitor relay 51 and the second monitor relay 52 respectively send their monitoring results to the first microcomputer integrated protection device 61 in the inlet cabinet 6;
the first microcomputer integrated protection device 61 in the incoming cabinet 6 makes a logical judgment on the fault condition (namely, integrity) in the PT cabinet according to the monitoring results sent by the two monitoring relays, namely, when the PT cabinet is judged to be a fuse or an open fault, tripping and locking a low-voltage outlet are needed, and a logical judgment result for driving the locking relay to enable the locking bus to be electrified is output;
the first microcomputer integrated protection device 61 of the incoming line cabinet 6 sends a driving signal to the first switch 41 through the signal outlet contact 62, so that the first switch 41 is closed, further the locking bus 3 is electrified, the locking relay 73 of the electric cabinet 7 is electrified, a relay contact signal of the locking relay 73 is transmitted to the second microcomputer integrated protection device 72 of the electric cabinet 7, the second microcomputer integrated protection device 72 logically judges that the low voltage is caused by the tripping of a fuse or an idle opening fault in the PT cabinet instead of the low voltage of the electric power system, at the moment, the low voltage outlet is locked, the third switch 43 does not trip, and therefore the low voltage locking of the motor is achieved.
Claims (1)
1. A medium voltage switchgear for implementing low voltage lockout of an electric motor, comprising:
a power supply device (1);
a main bus bar (2);
a locking bus (3) electrically connected to the power supply device (1) through a first switch (41);
a PT cabinet (5) having a first stage PT, a second stage PT, a first monitor relay (51) for monitoring the first stage PT for failure, and a second monitor relay (52) for monitoring the second stage PT for failure;
the incoming line cabinet (6) is provided with a first microcomputer comprehensive protection device (61) and a signal outlet contact (62), the first microcomputer comprehensive protection device (61) is in signal connection with a first monitoring relay (51), a second monitoring relay (52) and the signal outlet contact (62) respectively, the first microcomputer comprehensive protection device (61) is electrically connected with the main bus (2) through a second switch (42), and the signal outlet contact (62) is electrically connected with the power supply device (1) through a first switch (41);
the motor cabinet (7) is provided with a motor (71), a second microcomputer comprehensive protection device (72) corresponding to the motor (71) and a locking relay (73), wherein the second microcomputer comprehensive protection device (72) is in signal connection with the locking relay (73), the locking relay (73) is electrically connected with a locking bus (3), and the second microcomputer comprehensive protection device (72) is electrically connected with a main bus (2) through a third switch (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020303630.7U CN211606079U (en) | 2020-03-12 | 2020-03-12 | Medium-voltage switch cabinet for realizing low-voltage locking of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020303630.7U CN211606079U (en) | 2020-03-12 | 2020-03-12 | Medium-voltage switch cabinet for realizing low-voltage locking of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211606079U true CN211606079U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020303630.7U Active CN211606079U (en) | 2020-03-12 | 2020-03-12 | Medium-voltage switch cabinet for realizing low-voltage locking of motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362110A (en) * | 2021-12-31 | 2022-04-15 | 江苏核电有限公司 | Low-voltage protection device and method suitable for nuclear power station |
-
2020
- 2020-03-12 CN CN202020303630.7U patent/CN211606079U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362110A (en) * | 2021-12-31 | 2022-04-15 | 江苏核电有限公司 | Low-voltage protection device and method suitable for nuclear power station |
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