CN211089136U - 6kV house service power interconnection device - Google Patents

Abstract

The utility model provides a 6kV power supply interconnection device for factory use, which is connected between a first unit and a second unit. The first unit includes a first segment of busbar and a second segment of busbar, and the second unit includes a third segment of busbar and a fourth segment of busbar. The interconnection device includes a connection circuit connected between the second segment busbar and the fourth segment busbar, and the connection circuit includes sequentially connected: the first interconnected quick-cut cabinet, the first circuit breaker, the first plug interval, and the connection segment busbar , the second plug interval, the second circuit breaker, the second interconnecting quick-cut cabinet; a third circuit breaker is connected between the second busbar and the high-standby transformer busbar, and the fourth busbar and the high-standby transformer busbar are connected with a third circuit breaker. Four circuit breakers, the first interconnecting quick-cut cabinet is used for parallel connection and switching between the first circuit breaker and the third circuit breaker, and the second interconnected quick-cut cabinet is used for the parallel connection and switching between the second circuit breaker and the fourth circuit breaker switch. The utility model can improve the operation reliability of the factory power supply and achieve the purpose of saving energy.

Description

A 6kV factory power supply interconnection device

technical field

The utility model relates to the technical field of factory power supplies, in particular to a 6kV factory power supply interconnection device.

Background technique

Taking Huainan Tianjia'an Power Plant as an example, Figure 1 is a schematic diagram of the interconnection structure of the existing 6kV power supply. There are two 320MW units of #5 and #6 units, both of which are unit wiring, and the #5 unit is 6kV power supply. Including 6kV51 section, 6kV52 section, #6 unit 6kV power plant includes 6kV61 section, 6kV62 section, #5, #6 unit 6kV power plant backup power is taken from #2, #3 high standby transformer 6kV02 section and 6kV03 section .

Under the current circumstances, according to the relevant documents of the power grid company, the metering of the high-standby substation gateway meter is based on the grid electricity price standard of 0.7 yuan/kWh, and the metering of the unit gateway meter is based on the grid electricity price standard of 0.369 yuan/kWh. According to the statistics of the whole year of 2016, the electricity purchased from the grid is 8.653 million kWh, and an extra electricity bill of 2.864 million yuan needs to be paid.

From the energy consumption analysis, when the #5 and #6 units are in normal operation, the #2 and #3 high-standby transformers remain in the no-load state, and the monthly loss is about 100,000 kWh; when the #5 unit is running alone, the #2 , #3 high-standby transformer belt #6 unit factory power consumption, the monthly loss is about 700,000 kWh; when #6 unit is running alone, #2, #3 high backup transformer belt #5 unit factory power consumption, due to the load of the public system It is mostly connected to the power consumption of the #5 unit, and the monthly loss is about 900,000 kWh.

In addition, the existing high standby transformer operation mode lacks sufficient flexibility. When the two units are in operation, when the #2 and #3 high standby transformers are pre-tested for maintenance, the two units have no backup power supply, and the operation mode of the factory electricity is weak. After any one unit fails, it cannot resume operation in a short time; single unit During operation, #2 and #3 high standby transformers do not have power failure conditions.

Utility model content

The utility model provides a 6kV factory power supply interconnection device, so as to improve the reliability of the factory power supply operation and achieve the purpose of saving energy.

In order to solve the above-mentioned technical problems, the embodiments of the present utility model provide the following solutions:

A 6kV factory power supply interconnection device is connected between a first unit and a second unit, the first unit includes a first section of busbar and a second section of busbar, and the second unit includes a third section of busbar and a fourth section of busbar The backup power of the first unit and the second unit is taken from the fifth busbar connected with the first high-standby transformer and the sixth busbar connected with the second high-standby transformer,

The interconnection device includes a communication circuit connected between the second section of the busbar and the fourth section of the busbar, and the communication loop includes sequentially connected: the first interconnected quick-cut cabinet located in the first unit, the second a circuit breaker, a first plug interval, a connection section busbar, a second plug interval, a second circuit breaker, and a second interconnecting quick switch cabinet located in the second unit;

Wherein, a third circuit breaker is connected between the second busbar and the sixth busbar, a fourth circuit breaker is connected between the fourth busbar and the sixth busbar, and the first busbar is The interconnected quick-cut cabinet is used for parallel connection and switching between the first circuit breaker and the third circuit breaker, and the second interconnected quick-cut cabinet is used for the connection between the second circuit breaker and the fourth circuit breaker. Paralleling and switching between.

Preferably, the tie loop further includes a backup circuit breaker, a backup incoming line voltage transformer and a busbar voltage transformer connected to the busbar of the tie section.

Preferably, a power cable is used to connect the second segment bus bar and the connecting segment bus bar, and between the contact segment bus bar and the fourth segment bus bar.

Preferably, the power cable is a 10kV 500mm ² single-core cable.

Preferably, the current carrying capacity of the power cable is between 1000-2000A.

Preferably, the current carrying capacity of the power cable is 1500A.

Preferably, the interconnection device further includes a line protection measurement and control device connected in the tie loop, and the line protection measurement and control device is used for overcurrent protection and grounding protection.

Preferably, the rated current of the first circuit breaker and the second circuit breaker is between 2000-3000A.

Preferably, the rated current of the first circuit breaker and the second circuit breaker is 2500A.

The above-mentioned scheme of the present utility model at least includes the following beneficial effects:

The utility model can meet the interconnection requirements of the 6kV factory power supply when the dual-machine operation is changed to the single-machine operation or the single-machine operation is changed to the double-click operation, improves the reliability of the factory power supply operation, and optimizes the 6kV factory power supply system; in addition, from the aspect of energy saving, the utility model It can effectively reduce the annual purchase of grid electricity, thereby saving costs and producing good economic benefits.

Description of drawings

Fig. 1 is the schematic diagram of the interconnection structure of the existing 6kV factory power supply;

FIG. 2 is a schematic structural diagram of a 6kV factory power supply interconnection device provided by an embodiment of the present invention.

Description of reference numerals: 1-first unit; 2-second unit; 3-first high-standby transformer; 4-second high-standby transformer; 101-first busbar; 102-second busbar; 103-second busbar One interconnecting quick-cut cabinet; 104-third circuit breaker; 201-third busbar; 202-fourth busbar; 203-second interconnecting quick-cutting cabinet; 204-fourth circuit breaker; 301-fifth segment Busbar; 401-sixth busbar; 501-first circuit breaker; 502-second circuit breaker; 503-first plug interval; 504-second plug interval; - busbar voltage change;

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

An embodiment of the present utility model provides a 6kV power supply interconnection device for factory use. As shown in FIG. 2 , the interconnection device is connected between a first unit 1 and a second unit 2, and the first unit 1 includes a first section of busbar 101 and the second section of the bus 102, the second unit 2 includes the third section of the bus 201 and the fourth section of the bus 202, the backup power of the first unit 1 and the second unit 2 are taken from the first high-standby transformer 3. The five-segment busbar 301 and the sixth-segment busbar 401 connected to the second high standby transformer 4, wherein:

The interconnection device includes a communication circuit connected between the second busbar 102 and the fourth busbar 202, and the communication circuit includes sequentially connected: the first interconnecting quick-cut cabinet 103 located in the first unit 1, the first disconnecting circuit 501, the first plug interval 503, the connecting section bus bar 505, the second plug interval 504, the second circuit breaker 502, and the second interconnecting quick switch cabinet 203 located in the second unit 2;

The third circuit breaker 104 is connected between the second busbar 102 and the sixth busbar 401 , the fourth circuit breaker 204 is connected between the fourth busbar 202 and the sixth busbar 401 , and the first interconnected quick switch cabinet 103 is used for parallel connection and switching between the first circuit breaker 501 and the third circuit breaker 104 , and the second interconnecting quick switch cabinet 203 is used for parallel connection and switching between the second circuit breaker 502 and the fourth circuit breaker 204 .

The operation mode of the utility model is as follows:

1) When the two machines are running, the original running mode remains unchanged;

2) When the dual-unit operation is changed to the single-unit operation, such as the first unit 1 continues to run and the second unit 2 is switched from operation to maintenance: disconnect the fourth circuit breaker 204 through the second interconnecting quick-cut cabinet 203, and close the second circuit breaker device 502, which realizes interconnection and power supply through the connection circuit;

3) When the single-unit operation is changed to the dual-unit operation, such as the first unit 1 continues to run, and the second unit 2 is scheduled to be switched from maintenance to operation: when the second unit 2 is ready to be normal, close the first unit through the second interconnecting quick switch cabinet 203. The fourth circuit breaker 204 disconnects the second circuit breaker 502 to switch to the dual-machine operation mode.

The utility model can meet the interconnection requirements of the 6kV factory power supply when the dual-machine operation is changed to the single-machine operation or the single-machine operation is changed to the double-click operation, improves the reliability of the factory power supply operation, and optimizes the 6kV factory power supply system; in addition, from the aspect of energy saving, the utility model It can effectively reduce the annual purchase of grid electricity, thereby saving costs and producing good economic benefits.

Further, the tie loop also includes a backup circuit breaker 506 connected to the busbar 505 of the tie section, a backup incoming line voltage transformer (not shown) and a busbar voltage transformer 507, and the above equipment is used as a backup for the backup voltage unit.

Further, the connection between the second segment bus bar 102 and the contact segment bus bar 505 and between the contact segment bus bar 505 and the fourth segment bus bar 202 are connected by power cables.

Preferably, the power cable is a 10kV 500mm ² single-core cable, and its current carrying capacity is between 1000-2000A.

Preferably, the rated current of the newly added first circuit breaker 501 and the second circuit breaker 502 in the tie circuit is between 2000-3000A.

Considering that the power load of the unit during the start-up or shutdown process is about 10MVA, and the capacity of the standby pressure unit is about 15MW, considering the maximum value of 15MW plus a 10% margin, the current carrying capacity of the power cable is preferably 1500A, and a new circuit breaker is added. The rated current is preferably 2500A.

Further, the interconnection device further includes a line protection measurement and control device (not shown) connected in the tie loop, and the line protection measurement and control device is used for overcurrent protection and grounding protection. Here you can choose the PSL691 digital line protection measurement and control device produced by Nanzi.

The construction and debugging process of the present utility model are as follows:

1) Add a first circuit breaker 501 and a control circuit, and improve the first interconnected quick switch cabinet 103 and control circuit (need to be combined with the second section of bus 102 to power off);

2) Add a second circuit breaker 502 and a control circuit, and improve the second interconnected quick-cut cabinet 203 and control circuit (it needs to be combined with the fourth busbar 202 to power off);

3) Added 6kV contact section and control loop to realize remote control opening and closing command, feedback, remote/local feedback, protection alarm, current remote transmission, etc.;

4) Lay power cables and wiring (the above steps 1, 2, and 3 need to be completed);

5) Individual debugging and overall debugging.

Among them, the equipment in the liaison section can be laid in a new switch room beside the switch room of the first unit 1 and the second unit 2, and the first interconnected quick switch cabinet 103 and the second interconnected quick switch cabinet 203 can be installed in the first unit 1 respectively. And in the protection chamber of the second unit 2, each interconnected quick-cutting cabinet includes a set of quick-cutting devices for switching between circuit breakers.

The interconnection device provided by the utility model can not only satisfy the interconnection of the 6kV factory power supply, but also improve the reliability of the factory power operation and optimize the 6kV factory power supply system.

In addition, in terms of energy saving, based on the electricity purchased from the grid in 2016, if the annual electricity purchased from the grid is reduced to 1.2 million kWh, the annual savings will be (8.653 million kWh-1.2 million kWh) × (0.7-0.369 yuan/kWh) = 246.7 10,000 yuan can quickly recover the cost and bring considerable economic benefits.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and retouching should also be regarded as the protection scope of the present invention.

Claims (9)

1. A 6kV factory power supply interconnection device is connected between the first unit and the second unit, the first unit includes a first segment busbar and a second segment busbar, and the second unit includes the third segment busbar and The fourth section of busbar, the backup power supply of the first unit and the second unit is taken from the fifth section of the busbar connected to the first high-standby transformer and the sixth section of the busbar connected to the second high-standby transformer. is, The interconnection device includes a communication circuit connected between the second section of the busbar and the fourth section of the busbar, and the communication loop includes sequentially connected: the first interconnected quick-cut cabinet located in the first unit, the second a circuit breaker, a first plug interval, a connection section busbar, a second plug interval, a second circuit breaker, and a second interconnecting quick switch cabinet located in the second unit; Wherein, a third circuit breaker is connected between the second busbar and the sixth busbar, a fourth circuit breaker is connected between the fourth busbar and the sixth busbar, and the first busbar is The interconnected quick-cut cabinet is used for parallel connection and switching between the first circuit breaker and the third circuit breaker, and the second interconnected quick-cut cabinet is used for the connection between the second circuit breaker and the fourth circuit breaker. Paralleling and switching between. 2 . The 6kV factory power supply interconnection device according to claim 1 , wherein the tie loop further comprises a backup circuit breaker, a backup incoming line voltage transformer and a busbar voltage transformer connected to the busbar of the tie section. 3 . 3 . The 6kV factory power interconnection device according to claim 1 , wherein the connection between the second busbar and the contact busbar and between the contact busbar and the fourth busbar is 3 . Connection via power cable. 4. The 6kV factory power supply interconnection device according to claim 3, wherein the power cable is a 10kV500mm ² single-core cable. 5 . The 6kV factory power interconnection device according to claim 3 , wherein the current carrying capacity of the power cable is between 1000-2000A. 6 . 6 . The 6kV factory power supply interconnection device according to claim 5 , wherein the current carrying capacity of the power cable is 1500A. 7 . 7. The 6kV factory power supply interconnection device according to claim 1, wherein the interconnection device further comprises a line protection measurement and control device connected in the tie loop, and the line protection measurement and control device is used for overcurrent protection and earth protection. 8 . The 6kV factory power interconnection device according to claim 1 , wherein the rated current of the first circuit breaker and the second circuit breaker is between 2000-3000A. 9 . 9 . The 6kV factory power interconnection device according to claim 8 , wherein the rated current of the first circuit breaker and the second circuit breaker is 2500A. 10 .

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