CN209948370U - Bypass node type PT cabinet - Google Patents

Abstract

The utility model relates to a bypass node type PT cabinet, which comprises a cabinet body, in which a control mechanism warehouse, a switch warehouse, a PT warehouse and a bypass branch line connection warehouse are arranged in sequence in the order of the grid; The control mechanism and the bypass branch line control mechanism, the top of the switch compartment is installed with the ejector and the cabinet bushing; the bypass branch line switch, PT switch and busbar are installed in the switch compartment; The PT compartment is also equipped with a wall bushing; the bypass branch line connection compartment is equipped with a bypass branch line quick interface; the bypass branch line switch is connected to the bypass branch line quick plug interface through the three-way busbar in the busbar; the PT switch The other three-way busbars in the busbar are connected to the wall bushings in the PT compartment; the wall bushings in the PT compartment and the voltage transformer are connected by PT fully insulated connecting wires.

Description

Bypass node type PT cabinet

technical field

The invention relates to the field of voltage transformer cabinets, and more particularly, to a bypass node type PT cabinet.

Background technique

At present, a large number of cables are used in the urban distribution network to enter the ground, which solves the problems of urban overhead lines affecting aesthetics, tree line contradictions, and building line contradictions. But at the same time, it also breeds new problems, that is, the cable line is close to the ground, so the line design with full insulation is almost used. Still very long. In traditional ring network cabinets or switch stations, a backup interval is generally reserved. When a line fails and needs to be repaired, the backup interval is used to supply power to the load under the line. However, due to the rapid growth of urban load and the increasing shortage of urban land, in many cases, there is no spare interval in the ring main unit and the switch station. Therefore, when the line fails and needs to be repaired, the power must be cut off, which reduces the power supply. reliability.

At present, the planned blackout time of my country's distribution network is relatively high (about 71.70%), and there is still a gap between the non-blackout operation technology and foreign developed countries in terms of operation methods and projects, operators, operation tools and equipment. According to the national "QGDW/10520-2016 10kV Distribution Network Uninterrupted Operation Specifications", the maintenance operation of the distribution network should follow the principle of "energy without interruption".

In response to the above problems, with reference to the experience of developed regions abroad, State Grid put forward the concept of restoring electricity first and then operating. First, improve the grid structure. By dividing the large power grid into several small power grids, the multi-section and multi-interconnection method is adopted to assist the intelligent power grid technology to achieve uninterrupted operation. Secondly, the operation equipment such as medium-voltage generator car, box-transformer car, bypass cable, etc. is used to carry out the first-recovery operation of the plane or point, so as to reduce the power outage and improve the reliability of the power supply. But in practical applications, the following problems still cannot be solved:

1. Cable trench on fire: In most cities in China, the cable trench design is far behind the speed of urban electricity consumption growth, so the cable trench has always been in a state of disorder, congestion, and many hidden dangers, often the main circuit, backup circuit, branch The circuits are all in a ditch. Once the fire is on, the grid interconnection is directly disconnected.

2. Power distribution room incoming line failure: In most cities in China, it is still impossible to achieve multi-circuit incoming lines in all power distribution rooms. For single-circuit incoming lines, once the power supply is missing, the user can only power off.

3. Capacity problem: The power transfer is carried out through the grid structure. If the normal line capacity is not enough to meet the user capacity requirements of the faulty line, the purpose of uninterrupted operation still cannot be achieved.

4. Temporary power consumption: When major events encounter power conservation and the capacity is not enough to temporarily increase the capacity, it is necessary to obtain electricity from the existing grid or connect to a mobile power supply.

The above problems cannot be solved by optimizing the grid structure in a short time. At present, operation equipment such as medium-voltage generator trains, box-transformer trains, and bypass cables are used to carry out the first-recovery operation of planes or points. From a technical theoretical level, there is no problem, but in practice, these operating equipment rarely find a fast access point without power failure in the cable network line.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

In order to solve the above problems of the prior art, the present invention proposes a bypass node type PT cabinet, which adds a branch control circuit and a branch quick interface to the original PT cabinet, and the ring network cabinet combined with the PT cabinet is installed in the original PT cabinet. Places such as line concentration points, multi-line intersections, near key users, and areas where residents are concentrated can be used as access points for distribution network restoration equipment at any time to solve the problem of rapid grid connection without interruption of medium voltage restoration technology.

(2) Technical solutions

In order to achieve the above-mentioned purpose, the main technical scheme adopted in the present invention includes:

Design a bypass node type PT cabinet, including a cabinet body, in which the control mechanism warehouse, the switch warehouse, the PT warehouse, and the bypass branch line connection warehouse are arranged in sequence in the order of square characters;

A PT control mechanism and a bypass branch line control mechanism are installed in the control mechanism compartment, and an ejector and cabinet bushing is installed on the top of the switch compartment;

A bypass branch switch, a PT switch and a busbar are installed in the switch compartment;

PT fully insulated connecting wires and voltage transformers are installed in the PT warehouse, and the PT warehouse is also provided with a wall bushing;

A bypass branch line quick interface is installed in the bypass branch line connection warehouse;

Wherein, the bypass branch line switch is connected with the quick-plug interface of the bypass branch line through the three-way busbar in the busbar; the PT switch is connected with the wall bushing in the PT warehouse through the other three-way busbar in the busbar; The wall bushing and the voltage transformer in the PT warehouse are connected through the PT fully insulated connecting wire.

In the above solution, the PT control mechanism is a switch control mechanism for controlling the power supply of the PT switch.

In the above solution, the bypass branch line control mechanism is a switch control mechanism for controlling the power supply of the bypass branch line switch.

In the above solution, the PT fully insulated connecting line is a single-core cable with elbow-shaped cable joints installed at both ends, which is used to realize the electrical connection between the voltage transformer and the PT switch.

In the above solution, the bypass branch line quick-plug interface is a cable connection interface with a spring-ball self-locking mechanical structure, which is used to realize fast electrical connection between the cable quick-plug terminal and the bypass branch line switch.

In the above solution, the busbars are flat and long regular copper bars, including six sets of main circuit busbars and one set of grounding busbars, which are used for the electrical connection between the switch and the interface and the grounding connection of the switch.

In the above solution, the bypass branch line switch is a 10kV circuit breaker, which is used to control the power supply of the bypass branch line circuit.

In the above solution, the PT switch is a 10kV isolation switch, which is used to control the power supply of the PT circuit.

In the above solution, the bushing for ejecting parallel cabinets is a cable outlet bushing for 10kV switchgear, which is used to connect the PT cabinet with the busbar.

(3) Beneficial effects

The beneficial effects of the present invention are as follows: the present invention does not increase the number of incoming and outgoing wire cabinets of the ring network cabinet, has no special requirements for the design of cable network lines, and can completely replace the current PT cabinet; has the function of branch node power control, and can perform uninterrupted power transfer. Applying fast interconnection technology, the PT cabinet’s input and output line interfaces adopt quick plugging and unplugging method, build an interconnected reliable power supply guarantee network from the equipment level, and form a fixed power hotspot on the distribution network line as a power supply access point or load output point , to achieve rapid and flexible networking of medium voltage and rapid power restoration, which can greatly improve the efficiency of the cable network without power failure; it solves the problems of cumbersome cable maintenance wiring, complicated construction, long time, and multiple power failures, which will effectively improve the cable network. Work efficiency, shorten power outage time, and improve power supply reliability.

Description of drawings

Figure 1 is a schematic structural diagram of a bypass node type PT cabinet.

[Description of reference numerals]

1. PT control mechanism;

2. Bypass branch line control mechanism;

3. Control organization warehouse;

4. PT fully insulated connecting wire;

5. PT warehouse;

6. Voltage transformer;

7. Bypass branch line connection warehouse;

8. Bypass branch line quick-plug interface;

9. Cabinet;

10. Busbar;

11. Bypass branch switch;

12. PT switch;

13. Switch compartment;

14. Eject the casing of the parallel cabinet.

Detailed ways

In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

In this embodiment, the meanings of "PT" are all voltage transformers.

As shown in FIG. 1 , the present invention provides a bypass node type PT cabinet, which includes a cabinet body 9. In the cabinet body 9, a control mechanism bin 3, a switch bin 13, a PT bin 5, and a bypass branch line are sequentially arranged in the order of square characters. Connection warehouse 7. The PT control mechanism 1 and the bypass branch line control mechanism 2 are located in the control mechanism warehouse 3; the PT fully insulated connecting line 4 and the voltage transformer 6 are located in the PT warehouse 5; the bypass branch line quick-insertion interface 8 is located in the bypass branch line connection warehouse 7 The busbar 10, the bypass branch switch 11 and the PT switch 12 are located in the switch compartment 13; the ejector and cabinet bushing 14 is located at the top of the switch compartment 13; the bypass branch switch 11 passes through the three-way busbar in the busbar 10 and the side The PT switch 12 is connected to the wall bushing in the PT bin 5 through the other three busbars in the bus bar 10; the PT fully insulated connecting line 4 connects the wall bushing in the PT bin 5 with the The voltage transformer 6 is connected.

PT control mechanism 1 is a standard switch control mechanism, mainly used for 10kV switch opening and closing control. In this embodiment, the PT control mechanism 1 is mainly used to control the power supply of the PT switch 12 .

Bypass branch line control mechanism 2 is a standard switch control mechanism, mainly used for 10kV switch opening and closing control. In this embodiment, the bypass branch line control mechanism 2 is used to control the power supply of the bypass branch line switch 11 .

The control mechanism bin 3 is a cuboid hollow structure, and its function is to provide installation positions for the PT control mechanism 1 and the bypass branch line control mechanism 2, and to facilitate the operator to perform control operations.

The PT fully insulated connecting wire 4 is a single-core cable with elbow-shaped cable joints installed at both ends, and is used for the electrical connection between the voltage transformer 6 and the PT switch 12 .

The PT bin 5 is a cuboid hollow structure, and its function is mainly used to place the voltage transformer 6 . Voltage transformer is a kind of high-voltage transformer, which is mainly used to provide voltage measurement for ring network cabinet, voltage loop of measuring meter, operation and control power supply, installation of overvoltage protector for each section of bus, and relay protection needs. Such as busbar insulation, overvoltage, undervoltage, self-switching conditions and so on.

The bypass branch line connection bin 7 is a hollow cuboid structure, and its function is to install the bypass branch line quick interface 8, and carry out five-proof protection for the bypass branch line cable access operation.

The bypass branch line quick-plug interface 8 is a cable connection interface with a spring marble self-locking mechanism, and its function is to realize a special cable quick-plug terminal and the bypass branch line switch for quick electrical connection.

The cabinet 9 is a cuboid metal cabinet with four compartments in the middle, and the function is to place all the components of the bypass node type PT cabinet.

The busbar 10 is a flat and long regular copper busbar, with a total of 7 sets, including 6 sets of main circuit busbars and one set of grounding busbars. The function of the bus bar 10 is mainly the electrical connection between the switch and the interface and the ground connection of the switch.

The bypass branch switch 11 is a common 10kV circuit breaker, and its function is to control the power supply of the bypass branch circuit.

The PT switch 12 is a common 10kV isolation switch, which is mainly used to control the power supply of the PT circuit.

The switch compartment 13 is a rectangular hollow structure, and its function is to accommodate the bypass branch switch 11 , the PT switch 12 and the busbar 10 .

The ejector and cabinet bushing 14 is a common cable outlet bushing for 10kV switchgear, and its main function is to connect the PT cabinet with the busbar.

The accompanying drawings describe the embodiments of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only schematic, not restrictive, and those of ordinary skill in the art are familiar with the present invention. Under the inspiration of the present invention, many forms can be made without departing from the scope of protection of the present invention and the claims, which all belong to the protection of the present invention.

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.

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