CN209948370U - Bypass node type PT cabinet - Google Patents
Bypass node type PT cabinet Download PDFInfo
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- CN209948370U CN209948370U CN201920819828.8U CN201920819828U CN209948370U CN 209948370 U CN209948370 U CN 209948370U CN 201920819828 U CN201920819828 U CN 201920819828U CN 209948370 U CN209948370 U CN 209948370U
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- bypass branch
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Abstract
The utility model relates to a bypass node type PT cabinet, which comprises a cabinet body, wherein a control mechanism bin, a switch bin, a PT bin and a bypass branch line connection bin are sequentially arranged in the cabinet body according to the order of grid; a PT control mechanism and a bypass branch control mechanism are arranged in the control mechanism bin, and a push-out cabinet combining sleeve is arranged at the top of the switch bin; a bypass branch switch, a PT switch and a busbar are arranged in the switch bin; a PT fully-insulated connecting wire and a voltage transformer are arranged in the PT bin, and the PT bin is also provided with a wall bushing; a bypass branch quick interface is installed in the bypass branch connection bin; the bypass branch switch is connected with the bypass branch quick plug interface through the three busbars in the busbars; the PT switch is connected with a wall bushing in the PT bin through other three buses in the buses; and the wall bushing in the PT bin is connected with the voltage transformer through a PT fully-insulated connecting wire.
Description
Technical Field
The invention relates to the field of voltage transformer cabinets, in particular to a bypass node type PT cabinet.
Background
At present, a large number of cables are used for entering the ground in an urban power distribution network, and the problems that urban overhead lines affect the attractiveness, tree line contradictions, building line contradictions and the like are solved. However, a new problem is also raised, namely, the distance between a cable line and the ground is close, so that the design of a fully insulated line is almost adopted, once a fault or maintenance occurs, the live-line operation mode cannot be adopted for operation, only power failure can be used for operation, and the power failure time is long. In a traditional ring main unit or a switching station, a standby interval is generally reserved, and when a certain line breaks down and needs to be overhauled, the standby interval is used for supplying power to a load under the line. However, due to the rapid increase of urban load and the increasingly tense urban land use, under many conditions, there is no spare interval between the ring main unit and the switching station, so that when a line fails and needs to be repaired, power failure is required, and the reliability of power supply is reduced.
At present, the planned power failure time of the distribution network in China is high (about 71.70%), and the non-power-off operation technology is still in gap with the developed countries abroad in the aspects of operation methods and projects, operating personnel, operating tools and equipment. According to the national QGDW/10520-.
In order to solve the problems, the national power grid provides the concept of first power restoration and second operation according to the experience of developed foreign regions. Firstly, a grid structure is perfected, a large power grid is divided into a plurality of small power grids, and a multi-section and multi-interconnection mode is adopted to assist an intelligent power grid technology to achieve uninterrupted operation. And secondly, the operation equipment such as a medium-voltage generator car, a box transformer car, a bypass cable and the like is adopted to carry out surface or point first power restoration operation, so that power failure is reduced, and the power supply reliability is improved. However, in practical applications, the following problems still cannot be solved:
1. the cable trench catches fire: in most cities in China, the design of the cable trench can not catch up with the increase speed of the urban power consumption, so that the cable trench is always in a state of disorder, congestion and multiple hidden danger points, a main loop, a standby loop and branch loops are always in one trench, and once the main loop, the standby loop and the branch loops are on fire, the interconnection of the net racks is directly disconnected.
2. Distribution room inlet wire trouble: in most cities in China, all power distribution rooms cannot be provided with multi-loop incoming lines, and once a power supply is lost, a user can only cut off power for a single-loop incoming line.
3. Capacity problem: the power is converted through the grid structure to supply power, and if the capacity of a normal line is insufficient, the capacity requirement of a fault line user cannot be met, and the purpose of uninterrupted operation cannot be achieved.
4. Temporary power utilization: in the case of important activities, power conservation and temporary capacity increase are insufficient, and power is required to be taken from the existing net rack or a mobile power supply is required to be accessed.
The above problems cannot be solved by grid structure optimization in a short time. At present, medium-voltage power generation cars, box transformer cars, bypass cables and other operation equipment are adopted to carry out surface or point first-order power restoration operation. There is no problem from the technical theory level, but in actual work, these working devices rarely find a fast access point in the cable network without power cut.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a bypass node type PT cabinet, wherein a branch control loop and a branch quick interface are added in the original PT cabinet, and a ring main unit combined with the PT cabinet is arranged at a line concentration point, a multi-line cross point, a position near a key user, a resident concentration area and the like and can be used as an access point of distribution network power recovery equipment at any time, so that the problem of non-power-outage quick grid connection of a medium-voltage power recovery technology is solved.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a bypass node type PT cabinet is designed, and comprises a cabinet body, wherein a control mechanism bin, a switch bin, a PT bin and a bypass branch connecting bin are sequentially arranged in the cabinet body according to a grid sequence;
a PT control mechanism and a bypass branch control mechanism are installed in the control mechanism bin, and a push-out cabinet combining sleeve is installed at the top of the switch bin;
a bypass branch switch, a PT switch and a busbar are arranged in the switch bin;
a PT fully-insulated connecting wire and a voltage transformer are arranged in the PT bin, and the PT bin is also provided with a wall bushing;
a bypass branch quick interface is installed in the bypass branch connection bin;
the bypass branch switch is connected with a bypass branch quick plug interface through three busbars in the busbars; the PT switch is connected with a wall bushing in the PT bin through other three buses in the buses; and the wall bushing in the PT bin is connected with the voltage transformer through a PT fully-insulated connecting wire.
In the above scheme, the PT control mechanism is a switch control mechanism for controlling a power supply of the PT switch.
In the above scheme, the bypass branch control mechanism is a switch control mechanism for controlling a power supply of the bypass branch switch.
In the above scheme, the PT fully-insulated connecting wire is a single-core cable with elbow-shaped cable joints at two ends, and is used for realizing electrical connection between the voltage transformer and the PT switch.
In the above scheme, the fast bypass line plugging interface is a cable connection interface with a spring and marble self-locking mechanical structure, and is used for realizing fast electrical connection between the fast cable plugging terminal and the bypass line switch.
In the above scheme, the busbar is a rectangular regular copper bar, and includes six sets of main circuit busbars and one set of grounding busbar, and is used for electrical communication between the switch and the interface and switch grounding communication.
In the above scheme, the bypass branch switch is a 10kV circuit breaker for controlling the power supply of the bypass branch circuit.
In the above scheme, the PT switch is a 10kV isolation switch, and is used to control the power supply of the PT loop.
In the above scheme, the ejection cabinet combining sleeve is a cable outgoing sleeve for a 10kV switch cabinet, and is used for connecting the PT cabinet with a bus.
(III) advantageous effects
The invention has the beneficial effects that: the invention does not increase the number of the ring main unit in and out line cabinets, has no special requirements on cable network circuit design, and can completely replace the prior PT cabinet; the power supply switching device has the function of branch node power supply control and can carry out power supply switching without power failure; by applying a rapid interconnection technology, a PT cabinet wire inlet and outlet interface adopts a rapid plugging mode, an interconnection type reliable power utilization guarantee network is built from an equipment level, a fixed power supply hot spot is formed on a distribution network line and is used as a power supply access point or a load output point, medium-voltage rapid and flexible networking and rapid power restoration are realized, and the uninterrupted operation efficiency of a cable network can be greatly improved; the problems that the cable is complex in maintenance and wiring, complex in construction, long in time consumption, and capable of stopping power many times are solved, the cable operation efficiency is effectively improved, the power failure time is shortened, and the power supply reliability is improved.
Drawings
Fig. 1 is a schematic structural view of a bypass node type PT cabinet.
[ description of reference ]
1. A PT control mechanism;
2. a bypass branch control mechanism;
3. a control mechanism bin;
4. a PT fully insulated connecting wire;
5. a PT bin;
6. a voltage transformer;
7. the bypass branch line is connected with the bin;
8. a bypass branch line quick socket;
9. a cabinet body;
10. a busbar;
11. a bypass branch switch;
12. a PT switch;
13. a switch bin;
14. and ejecting the cabinet combining sleeve.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
In the present embodiment, "PT" means all voltage transformers.
As shown in fig. 1, the invention provides a bypass node type PT cabinet, which comprises a cabinet body 9, wherein a control mechanism bin 3, a switch bin 13, a PT bin 5 and a bypass branch connection bin 7 are sequentially arranged in the cabinet body 9 according to a grid sequence. The PT control mechanism 1 and the bypass branch control mechanism 2 are positioned in the control mechanism bin 3; the PT fully-insulated connecting wire 4 and the voltage transformer 6 are arranged in the PT bin 5; the bypass branch quick-plug interface 8 is positioned in the bypass branch connecting bin 7; the busbar 10, the bypass branch switch 11 and the PT switch 12 are positioned in the switch bin 13; the ejection cabinet combining sleeve 14 is positioned at the top of the switch cabin 13; the bypass branch switch 11 is connected with the bypass branch quick plug interface 8 through three busbars in the busbars 10; the PT switch 12 is connected with a wall bushing in the PT bin 5 through other three busbars in the busbar 10; and a PT fully-insulated connecting wire 4 connects a wall bushing in the PT bin 5 with a voltage transformer 6.
The PT control mechanism 1 is a standard switch control mechanism and is mainly used for switching-on and switching-off control of a 10kV switch. In this embodiment, the PT control mechanism 1 is mainly used to control the power supply of the PT switch 12.
The bypass branch control mechanism 2 is a standard switch control mechanism and is mainly used for switching-on and switching-off control of a 10kV switch. In this embodiment, the bypass branch control means 2 is used to control the power supply of the bypass branch switch 11.
The control mechanism cabin 3 is a cuboid hollow structure, and is used for providing mounting positions for the PT control mechanism 1 and the bypass branch control mechanism 2 and facilitating control operation of operators.
The PT fully insulated connecting wire 4 is a single-core cable with elbow-shaped cable joints arranged at two ends and is used for electrical connection between the voltage transformer 6 and the PT switch 12.
The bypass branch connection bin 7 is of a cuboid hollow structure and is used for installing a bypass branch quick interface 8 and carrying out five-prevention protection on the access operation of a bypass branch cable.
The bypass branch line quick plug interface 8 is a cable connection interface with a spring marble self-locking mechanical structure and is used for realizing quick electrical connection between a special cable quick plug terminal and a bypass branch line switch.
The cabinet body 9 is a rectangular metal cabinet with four partition bins in the middle, and is used for arranging parts of all bypass node type PT cabinets.
The busbar 10 is a rectangular regular copper bar, and comprises 7 sets of busbar, 6 sets of main circuit busbars and one set of grounding busbar. The bus bar 10 mainly serves for electrical communication between the switch and the interface and for grounding of the switch.
The by-pass branch switch 11 is a conventional 10kV circuit breaker and functions to control the power supply of the by-pass branch circuit.
The PT switch 12 is a conventional 10kV disconnector, which is mainly used to control the power supply of the PT loop.
The switch cabin 13 is a cuboid hollow structure and is used for arranging a bypass branch switch 11, a PT switch 12 and a busbar 10.
The ejection cabinet combining sleeve 14 is a common cable outlet sleeve for a 10kV switch cabinet and mainly used for connecting a PT cabinet with a bus.
While the present invention has been described with reference to the particular embodiments illustrated in the drawings, which are meant to be illustrative only and not limiting, it will be apparent to those of ordinary skill in the art in light of the teachings of the present invention that numerous modifications can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The bypass node type PT cabinet is characterized by comprising a cabinet body (9), wherein a control mechanism bin (3), a switch bin (13), a PT bin (5) and a bypass branch connection bin (7) are sequentially arranged in the cabinet body (9) according to a grid sequence;
a PT control mechanism (1) and a bypass branch control mechanism (2) are arranged in the control mechanism bin (3);
a bypass branch switch (11), a PT switch (12) and a busbar (10) are arranged in the switch bin (13), and a push-out cabinet combining sleeve (14) is arranged at the top of the switch bin (13);
a PT fully-insulated connecting wire (4) and a voltage transformer (6) are arranged in the PT bin (5), and a wall bushing is further arranged in the PT bin (5);
a bypass branch quick interface (8) is arranged in the bypass branch connection bin (7);
the bypass branch switch (11) is connected with the bypass branch quick plug interface (8) through three busbars in the busbars (10); the PT switch (12) is connected with a wall bushing in the PT bin (5) through other three busbars in the busbar (10); and the wall bushing in the PT bin (5) is connected with the voltage transformer (6) through a PT fully-insulated connecting wire (4).
2. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the PT control mechanism (1) is a switch control mechanism for controlling the power supply of the PT switch (12).
3. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the bypass branch control mechanism (2) is a switch control mechanism for controlling the power supply of the bypass branch switch (11).
4. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the PT fully-insulated connecting wire (4) is a single-core cable with elbow-shaped cable joints arranged at two ends and is used for realizing the electrical connection between the voltage transformer (6) and the PT switch (12).
5. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the bypass branch line quick plug interface (8) is a cable connection interface with a spring marble self-locking mechanical structure and is used for realizing quick electrical connection between a cable quick plug terminal and the bypass branch line switch (11).
6. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the busbar (10) is a flat and long regular copper bar, comprises six sets of main circuit busbars and one set of grounding busbar and is used for electrical communication between the switch and the interface and switch grounding communication.
7. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the bypass branch switch (11) is a 10kV circuit breaker and is used for controlling a power supply of the bypass branch loop.
8. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the PT switch (12) is a 10kV isolating switch and is used for controlling a power supply of a PT loop.
9. The PT cabinet of the bypass node type as claimed in claim 1, wherein: the ejection cabinet combining sleeve (14) is a cable outlet sleeve for a 10kV switch cabinet and is used for connecting the PT cabinet with a bus.
Priority Applications (1)
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CN201920819828.8U CN209948370U (en) | 2019-05-31 | 2019-05-31 | Bypass node type PT cabinet |
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CN201920819828.8U CN209948370U (en) | 2019-05-31 | 2019-05-31 | Bypass node type PT cabinet |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110086091A (en) * | 2019-05-31 | 2019-08-02 | 国网电力科学研究院武汉南瑞有限责任公司 | Shunt nodes type PT cabinet |
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2019
- 2019-05-31 CN CN201920819828.8U patent/CN209948370U/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110086091A (en) * | 2019-05-31 | 2019-08-02 | 国网电力科学研究院武汉南瑞有限责任公司 | Shunt nodes type PT cabinet |
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