CN216794597U - High-voltage power supply relay protection system of tower crane - Google Patents
High-voltage power supply relay protection system of tower crane Download PDFInfo
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- CN216794597U CN216794597U CN202122889837.4U CN202122889837U CN216794597U CN 216794597 U CN216794597 U CN 216794597U CN 202122889837 U CN202122889837 U CN 202122889837U CN 216794597 U CN216794597 U CN 216794597U
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Abstract
The utility model belongs to the technical field of tower cranes, and particularly relates to a high-voltage power supply relay protection system of a tower crane, which comprises a high-voltage power supply cabinet and a box-type substation, wherein the high-voltage power supply cabinet mainly comprises an isolating switch, a vacuum circuit breaker and a zero sequence current transformer; the high-voltage incoming line unit of the box-type transformer substation is mainly a load switch and fuse combined electrical apparatus, a fuse and a voltage/current transformer are arranged between an isolation switch and a vacuum circuit breaker of a high-voltage power supply cabinet, a grounding knife switch and a lightning arrester which are connected in parallel are arranged between the vacuum circuit breaker and a zero sequence current transformer in a ground manner, and the grounding knife switch and the lightning arrester are matched with a microcomputer comprehensive protection device arranged in a high-voltage power distribution cabinet for protection; the front end of a load switch of the high-voltage incoming line unit is provided with a lightning arrester, and a grounding switch is arranged at the fuse. The utility model solves the problem of safety protection when a large or ultra-large tower crane adopts high-voltage power supply through the relay protection design of a high-voltage power supply cabinet and a box-type substation in a high-voltage power supply system.
Description
Technical Field
The utility model belongs to the technical field of tower cranes, and particularly relates to a high-voltage power supply relay protection system of a tower crane.
Background
The existing tower crane industry generally adopts a low-voltage three-phase alternating current 380V/400V power supply mode, but for a large or ultra-large tower crane, because the required power is large, if the low-voltage three-phase alternating current 380V/400V power supply mode is adopted, the single-phase cable can cause the nominal section of the single-phase cable to even reach more than 300 square millimeters due to large bearing current, the price is high, and meanwhile, great difficulty is caused to manufacturing and field installation construction. The large or ultra-large tower crane needs to adopt high-voltage power supply due to large required power so as to reduce current and reduce cable diameter of a cable, which puts higher requirements on safety protection of the whole high-voltage power supply system of the tower crane.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides a high-voltage power supply relay protection system of a tower crane.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a high-voltage power supply relay protection system of a tower crane comprises a ground high-voltage power supply cabinet for high-voltage power supply, a box-type substation on a top platform of the tower crane and a high-voltage power supply cable, wherein the high-voltage power supply cabinet mainly comprises an isolating switch, a vacuum circuit breaker and a zero-sequence current transformer; the high-voltage wire inlet unit of the box-type substation is mainly a load switch and fuse II combined electrical appliance, a fuse I and a voltage/current transformer are arranged between an isolation switch and a vacuum circuit breaker of the high-voltage power supply cabinet, a grounding knife switch and a lightning arrester I which are connected in parallel are arranged between the vacuum circuit breaker and a zero-sequence current transformer in a ground mode, and the grounding knife switch and the lightning arrester I are matched with a microcomputer comprehensive protection device arranged in the high-voltage power supply cabinet for protection; and the front end of a load switch of the high-voltage incoming line unit is provided with a lightning arrester II, and a grounding switch is arranged at the fuse II.
Furthermore, an overtemperature protection device is further arranged in the box-type substation: the transformer unit is provided with an automatic temperature control device.
Further, low-voltage protection is also arranged in the box-type substation: the low-voltage main switch of the low-voltage power utilization unit adopts a frame circuit breaker and is provided with an intelligent controller.
Furthermore, an external protection is also arranged in the protection system.
Further, the external protection is a power supply cable protection: the power supply cable adopts a multilayer protective cable and is provided with an independent lightning protection and grounding cable.
Furthermore, the external protection has waterproof and anti-corrosion functions for the box-type transformer substation and the high-voltage power supply cabinet, and meets the high-voltage 5-prevention standard.
Furthermore, the grounding resistance set for the tower crane and the electric appliances thereof by the external protection is not more than 4 ohms, or when multiple places are repeatedly grounded, the grounding resistance is not more than 10 ohms.
The utility model provides a high-voltage power supply relay protection system of a tower crane, which solves the problem of safety protection when a large or ultra-large tower crane adopts high-voltage power supply through the relay protection design of a high-voltage power supply cabinet and a box-type substation in the high-voltage power supply system. And the protection of the whole high-voltage power supply system is improved by carrying out on a high-voltage cable, a tower crane body, electric equipment and the like.
Drawings
FIG. 1: a high-voltage power supply relay protection system diagram of a tower crane.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.
The utility model provides a high-voltage power supply relay protection system of a tower crane, which solves the problem of safety protection when a large or ultra-large tower crane adopts high-voltage power supply through the relay protection design of a ground high-voltage power supply cabinet 2 and a box type transformer substation 1 on a platform at the top of the tower crane. The concrete protection measures are as follows:
as shown in fig. 1, 1) protection of the ground high-voltage power supply cabinet: the high-voltage power supply cabinet 2 is installed at the bottom of the tower and mainly comprises an isolating switch 21, a vacuum circuit breaker 22 and a zero sequence current transformer 23. A fuse I24 and a voltage/current transformer 25 are arranged between the isolating switch 21 and the vacuum circuit breaker 22, a grounding knife switch 26 and a lightning arrester I27 which are connected in parallel are arranged between the vacuum circuit breaker 22 and the zero sequence current transformer 23 to the ground, and are matched with a microcomputer comprehensive protection device arranged in the high-voltage power supply cabinet 2 to complete short circuit, disconnection, overcurrent, overvoltage, zero sequence overcurrent, grounding fault, lightning stroke protection and the like through comprehensive setting parameters.
2) High-voltage protection of the box-type transformer substation: the high-voltage incoming line unit 11 of the box-type substation 1 is a combined electrical appliance of a load switch 111 and a fuse II 112. The front end of the load switch 111 is provided with a lightning arrester II 113, and the fuse II 112 is provided with a grounding switch 114, so that secondary protection of short circuit, overcurrent, overload and lightning stroke on the high-voltage side of the transformer 121 is realized.
The box-type substation 1 is also internally provided with:
3) overtemperature protection of a box-type transformer substation: the transformer unit 12 is provided with an automatic temperature control device for ventilation and heat dissipation;
4) low-voltage protection of the box-type transformer substation: the low-voltage main switch 131 of the low-voltage power utilization unit 13 adopts a frame breaker and is provided with an intelligent controller, and the low-voltage power utilization unit has long delay, short delay and instantaneous current protection.
Still be equipped with outside protection in tower machine high voltage power supply relay protection system:
5) protection of power supply cables: the power supply cable 3 adopts a multilayer protective cable and is provided with a single cable for lightning protection and grounding.
6) The ground high-voltage power supply cabinet and the box-type transformer substation on the top platform of the tower crane have the functions of water resistance and rust resistance, and meet the high-voltage 5-prevention condition.
7) Protecting a tower crane body: the main structure of the tower crane, the motor base, the metal shells of all electrical equipment and the metal protection tubes of the leads are reliably grounded, the grounding resistance of the tower crane is not more than 4 ohms, and when multiple places are repeatedly grounded, the grounding resistance is not more than 10 ohms.
Claims (7)
1. A high-voltage power supply relay protection system of a tower crane comprises a ground high-voltage power supply cabinet (2) for high-voltage power supply, a box-type substation (1) of a platform at the top of the tower crane and a high-voltage power supply cable (3), wherein the high-voltage power supply cabinet (2) mainly comprises an isolating switch (21), a vacuum circuit breaker (22) and a zero sequence current transformer (23); high-voltage incoming line unit (11) of box-type substation (1) mainly are load switch (111) and II (112) combined electrical apparatus of fuse, and it is waiting to be characterized in that: a fuse I (24) and a voltage/current transformer (25) are arranged between an isolating switch (21) and a vacuum circuit breaker (22) of the high-voltage power supply cabinet (2), a grounding knife switch (26) and a lightning arrester I (27) which are connected in parallel are arranged between the vacuum circuit breaker (22) and a zero sequence current transformer (23) to the ground and are matched with a microcomputer comprehensive protection device arranged in the high-voltage power supply cabinet (2); the front end of a load switch (111) of the high-voltage incoming line unit (11) is provided with a lightning arrester II (113), and a grounding switch (114) is arranged at the fuse II (112).
2. The high-voltage power supply relay protection system of the tower crane according to claim 1, which is characterized in that: the box-type substation (1) is also internally provided with overtemperature protection: the transformer unit (12) is provided with an automatic temperature control device.
3. The high-voltage power supply relay protection system of the tower crane according to claim 1, which is characterized in that: the box-type substation (1) is also internally provided with low-voltage protection: a low-voltage main switch (131) of the low-voltage electricity utilization unit (13) adopts a frame breaker and is provided with an intelligent controller.
4. The high-voltage power supply relay protection system of the tower crane according to claim 1, which is characterized in that: an external protection is also arranged in the protection system.
5. The high-voltage power supply relay protection system of the tower crane as claimed in claim 4, which is characterized in that: the external protection is power supply cable protection: the power supply cable (3) adopts a multilayer protective cable and is provided with an independent lightning protection and grounding cable.
6. The high-voltage power supply relay protection system of the tower crane as claimed in claim 4, which is characterized in that: the external protection has waterproof and anti-corrosion functions for the box-type transformer substation (1) and the high-voltage power supply cabinet (2), and meets the high-voltage 5-prevention standard.
7. The high-voltage power supply relay protection system of the tower crane as claimed in claim 4, which is characterized in that: the grounding resistance set for the tower crane and the electric appliance thereof should not be more than 4 ohms for the external protection, or the grounding resistance should not be more than 10 ohms when multiple places are repeatedly grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122889837.4U CN216794597U (en) | 2021-11-24 | 2021-11-24 | High-voltage power supply relay protection system of tower crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122889837.4U CN216794597U (en) | 2021-11-24 | 2021-11-24 | High-voltage power supply relay protection system of tower crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216794597U true CN216794597U (en) | 2022-06-21 |
Family
ID=82004041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122889837.4U Active CN216794597U (en) | 2021-11-24 | 2021-11-24 | High-voltage power supply relay protection system of tower crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216794597U (en) |
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2021
- 2021-11-24 CN CN202122889837.4U patent/CN216794597U/en active Active
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