CN211605665U - Realize cubical switchboard of fuse blowout low-voltage shutting - Google Patents
Realize cubical switchboard of fuse blowout low-voltage shutting Download PDFInfo
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- CN211605665U CN211605665U CN202020303628.XU CN202020303628U CN211605665U CN 211605665 U CN211605665 U CN 211605665U CN 202020303628 U CN202020303628 U CN 202020303628U CN 211605665 U CN211605665 U CN 211605665U
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Abstract
The utility model relates to a realize cubical switchboard of fuse fusing low-voltage shutting, including main bus, little busbar of voltage, PT cabinet and inlet wire cabinet, the PT cabinet has the side fuse of once, side fuse bumps needle auxiliary contact, secondary side air switch auxiliary contact, monitor relay and monitor relay auxiliary contact, and monitor relay connects side fuse respectively and bumps needle auxiliary contact and secondary side air switch auxiliary contact, and secondary side air switch connects little busbar of voltage; the inlet cabinet has a microcomputer integrated protection device connection connected with the auxiliary contact of the monitoring relay, and the microcomputer integrated protection device controls the connection of the breaker switch and the main bus. When the microcomputer integrated protection device detects the low voltage of the voltage bus, the on-off signal of the auxiliary contact of the monitoring relay judges that the equipment fault is caused by fuse wire fusing or idle tripping, and the real system low voltage does not appear in the power system, and the microcomputer integrated protection device starts PT disconnection latching low voltage logic protection to avoid the misoperation of the protection device.
Description
Technical Field
The utility model relates to a cubical switchboard field especially relates to a realize cubical switchboard of fuse fusing low-voltage shutting.
Background
The 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 switch cabinet is mainly suitable for various occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industrial textiles, factory and mining enterprises, residential districts, high-rise buildings and the like.
The voltage transformer is also called a PT cabinet, is an important device for measurement and protection in an electric power system, and is also an important device of a switch cabinet. The switch cabinet converts the high voltage of 10KV of the primary loop into the standard low voltage of 100V of the secondary loop through a voltage transformer, monitors the voltage condition of a bus in operation, provides voltage parameters required by a measuring instrument, a relay protection device and an automatic device, and ensures the normal operation of a system. In order to ensure the safety of equipment, a fuse or an air switch protection device is additionally arranged on the primary side and the secondary side of the voltage transformer, so that the short-circuit melting failure of the equipment is avoided. Once a voltage transformer fault occurs, the detection voltage of the protection device is lost due to the fusing of a primary side fuse or the tripping protection of a secondary side switch, and the misoperation of the protection device is caused. Therefore, the design considers that when the fuse is blown or the air-break fault occurs, the low-voltage disconnection locking function of the protection device is started.
In the current domestic switch cabinet design, the switch cabinet can only detect the condition of secondary side fuse blowing or idle switch fault tripping, although there is fuse protection at the primary side of the switch cabinet, the fuse blowing signal can not be transmitted to the protection device, and the protection configuration is incomplete and can not be realized.
Disclosure of Invention
The utility model aims to solve the technical problem that a realize cubical switchboard of fuse fusing 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 kind of switch cabinet which realizes the fuse wire fusing low voltage locking, it is characterized in that it includes:
a main bus;
a small voltage bus;
the PT cabinet is provided with a primary side fuse, a primary side fuse touch needle auxiliary contact, a secondary side air switch auxiliary contact, a monitoring relay for detecting the fault condition of the PT cabinet and a monitoring relay auxiliary contact, wherein the monitoring relay is respectively connected with the primary side fuse touch needle auxiliary contact and the secondary side air switch auxiliary contact, and the secondary side air switch is electrically connected with the small voltage bus;
the inlet wire cabinet is provided with a microcomputer comprehensive protection device, the microcomputer comprehensive protection device is electrically connected with the auxiliary contact of the monitoring relay, the microcomputer comprehensive protection device is in signal connection with the small voltage bus, and the microcomputer comprehensive protection device is electrically connected with the main bus through a control breaker switch.
In the improved switch cabinet for realizing fuse-blown low-voltage locking, the voltage on the main bus is 10 KV.
In particular, in the switch cabinet for realizing fuse-blowing low-voltage locking, the PT cabinet is a domestic KYN28-12 type PT cabinet.
Compared with the prior art, the utility model has the advantages of: the primary side fuse pin-touching auxiliary contact is arranged in the PT cabinet, the microcomputer comprehensive protection device is arranged in the incoming line cabinet, the monitoring relay sends monitoring result signals aiming at the primary side fuse pin-touching auxiliary contact and the secondary side air switch auxiliary contact to the microcomputer comprehensive protection device in the incoming line cabinet through the monitoring relay auxiliary contact, and then the microcomputer comprehensive protection device makes logic judgment on the fault condition (namely integrity) in the PT cabinet according to the monitoring result: when the low voltage of the voltage small bus is detected, the on-off signal of the auxiliary contact of the monitoring relay judges that the equipment fault is caused by fuse wire fusing or idle tripping instead of the real system low voltage of the power system, and the microcomputer comprehensive protection device in the incoming cabinet starts PT disconnection lockout low voltage logic protection to avoid the misoperation of the protection device.
Drawings
Fig. 1 is a schematic diagram of a switch cabinet for implementing fuse blowout low voltage lockout 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 switch cabinet for implementing fuse blowing low voltage lockout, including:
the main bus 1 is used for generating a voltage of 10 KV;
a voltage small bus 2;
a PT cabinet 3 having a primary side fuse 31, a primary side fuse pin collision auxiliary contact 32, a secondary side air switch 33, a secondary side air switch auxiliary contact 34, a monitoring relay 35 for detecting a fault condition of the PT cabinet and a monitoring relay auxiliary contact 36, the PT cabinet in this embodiment is a domestic KYN28-12 type PT cabinet, the monitoring relay 35 is respectively connected with the primary side fuse pin collision auxiliary contact 32 and the secondary side air switch auxiliary contact 34, and the monitoring relay 35 can monitor the condition that the primary side fuse pin collision auxiliary contact 32 and the secondary side air switch auxiliary contact 34; the secondary side air switch 33 is electrically connected with the small voltage bus 2;
the inlet cabinet 4 is provided with a microcomputer comprehensive protection device 41, the microcomputer comprehensive protection device 41 is electrically connected with the monitoring relay auxiliary contact 36, the microcomputer comprehensive protection device 41 is in signal connection with the small voltage bus 2, and the microcomputer comprehensive protection device 41 is electrically connected with the main bus 1 through a control breaker switch 42. The monitor relay 35 transmits a signal to the microcomputer integrated protection device 41 in the inlet cabinet 4 through the monitor relay auxiliary contact 36.
Specifically, the operating principle of the switch cabinet for realizing fuse blowing low-voltage locking in the embodiment is as follows:
by arranging the primary side fuse 31, the primary side fuse touch needle auxiliary contact 32 and the monitoring relay 35 in the PT cabinet 3 and arranging the microcomputer integrated protection device 41 in the inlet cabinet 4, the monitoring relay 35 transmits the monitoring result signals of the primary side fuse touch needle auxiliary contact 32 and the secondary side air switch auxiliary contact 34 to the microcomputer integrated protection device 41 in the inlet cabinet 4 through the monitoring relay auxiliary contact 36, and the microcomputer integrated protection device 41 makes a logic judgment on the fault condition (namely, the integrity) in the PT cabinet according to the monitoring result: when the low voltage of the voltage small bus is detected, the on-off signal of the auxiliary contact of the monitoring relay judges that the equipment fault is caused by fuse wire fusing or idle tripping instead of the real system low voltage of the power system, and the microcomputer integrated protection device 41 in the incoming cabinet 4 starts PT disconnection lockout low voltage logic protection to avoid the misoperation of the protection device.
Claims (3)
1. A kind of switch cabinet which realizes the fuse wire fusing low voltage locking, it is characterized in that it includes:
a main bus bar (1);
a voltage minibus (2);
a PT cabinet (3) which is provided with a primary side fuse (31), a primary side fuse touch needle auxiliary contact (32), a secondary side air switch (33), a secondary side air switch auxiliary contact (34), a monitoring relay (35) for detecting the fault condition of the PT cabinet and a monitoring relay auxiliary contact (36), wherein the monitoring relay (35) is respectively connected with the primary side fuse touch needle auxiliary contact (32) and the secondary side air switch auxiliary contact (34), and the secondary side air switch (33) is electrically connected with the small voltage bus (2);
the inlet wire cabinet (4) is provided with a microcomputer comprehensive protection device (41), the microcomputer comprehensive protection device (41) is electrically connected with the auxiliary contact (36) of the monitoring relay, the microcomputer comprehensive protection device (41) is in signal connection with the small voltage bus (2), and the microcomputer comprehensive protection device (41) is electrically connected with the main bus (1) through a control breaker switch (42).
2. The switchgear for realizing fuse blow low voltage lockout according to claim 1, characterized in that the voltage on the main bus (1) is 10 KV.
3. The switch cabinet for realizing fuse-blowing low-voltage lockout according to claim 1 or 2, characterized in that the PT cabinet (3) is a domestic KYN28-12 type PT cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020303628.XU CN211605665U (en) | 2020-03-12 | 2020-03-12 | Realize cubical switchboard of fuse blowout low-voltage shutting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020303628.XU CN211605665U (en) | 2020-03-12 | 2020-03-12 | Realize cubical switchboard of fuse blowout low-voltage shutting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211605665U true CN211605665U (en) | 2020-09-29 |
Family
ID=72582412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020303628.XU Active CN211605665U (en) | 2020-03-12 | 2020-03-12 | Realize cubical switchboard of fuse blowout low-voltage shutting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211605665U (en) |
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2020
- 2020-03-12 CN CN202020303628.XU patent/CN211605665U/en active Active
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