CN212323810U

CN212323810U - Unit connecting device for reducing power consumption of off-grid electricity

Info

Publication number: CN212323810U
Application number: CN202021313785.5U
Authority: CN
Inventors: 董亚林; 童国光; 徐佳伟; 朱延军; 孙建国; 颜国廷
Original assignee: Huaneng Huaiyin Second Power Generation Co Ltd
Current assignee: Huaneng Huaiyin Second Power Generation Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-01-08
Anticipated expiration: 2030-07-07

Abstract

The utility model discloses a unit connecting device for reducing the power consumption of off-grid electricity, which comprises a plurality of power distribution rooms, wherein each power distribution room is provided with a starting transformer connected with the power grid; each starting transformer is connected with a plurality of units for generating electricity through cables, and a public section is arranged between the plurality of units and the starting transformers connected with the plurality of units; and the corresponding public sections among the power distribution rooms are connected through cables. The utility model can use the power supply of other public sections through the connected cable, and use the electricity generated by the power plant; the use of off-grid power is reduced, and the economic benefit of the power plant is improved. Meanwhile, the starting transformer is in a shutdown standby state most of the time, and the shutdown starting transformer can be overhauled in a large amount of time.

Description

Unit connecting device for reducing power consumption of off-grid electricity

Technical Field

The utility model relates to an electric power correlation technique field, concretely relates to reduce unit connecting device of net electricity power consumption down.

Background

The power supply on the power grid and the power supply off the power grid are aimed at power generation units with the power grid or users with power generation output. The network access refers to the electric quantity sent into a power grid, and the network access refers to the electric quantity obtained from the power grid, namely the consumed electric quantity; when the metering prices are different, the metering is respectively carried out through the bidirectional electric energy meter.

At present, the situation of the power market is severe, for example: in a power plant with 2 starting transformers and 4 generator sets, 3 generator sets are in a standby state in 4 generator sets, and only 1 generator set is in an operating state; when the generator set is in a standby state, the power source consumed by the generator set is power for power off, and the power price for power off is generally twice higher than that for power on, so that the economic benefit is influenced.

In addition, the starting transformer needs to be periodically overhauled, the periodic overhauling condition is harsh, the generator set connected with the starting transformer needs to be completely operated, and the requirement is difficult to meet under severe power market conditions.

Disclosure of Invention

Aiming at the technical problem, the technical scheme provides the unit connecting device for reducing the power consumption of the off-grid electricity, and the problem can be effectively solved.

The utility model discloses a following technical scheme realizes:

a unit connecting device for reducing power consumption of off-grid electricity comprises a plurality of power distribution rooms, wherein each power distribution room is provided with a starting transformer connected with a power grid; each starting transformer is connected with a plurality of units for generating electricity through cables, and a public section for storing the electricity generated by the generator sets is arranged between the plurality of units and the starting transformers connected with the plurality of units; the corresponding public sections among the power distribution rooms are connected through a connecting line, and the connecting line is provided with a related auxiliary switch.

Furthermore, the power distribution room adopts a 6KV public power distribution room.

Furthermore, any one unit of the multiple units of the multiple power distribution rooms can be regarded as a normally open unit, and the common sections of other units are connected with the common section of the normally open unit; a quick switching device is connected between a public section of the normally open unit and a starting transformer of the normally open unit, and the quick switching device is installed between the electrons. When the normally open unit is abnormal, the starting transformer connected with the normally open unit can be started, and the electric access of a power grid is used as a standby power supply to be accessed, so that the normal power utilization of the whole plant is ensured.

Furthermore, the power distribution room comprises a No. 1 power distribution room, a No. 2 power distribution room and a No. 3 power distribution room … n power distribution room; a machine set A, a machine set B and a machine set C … N are arranged in the power distribution room; and a common section between the starting transformer of the N-number power distribution room and the N-number machine set is an Nn common section.

Further, N is a natural number, and N is an upper-case english letter; the Nn common segments are: the utility section between the starting transformer and the machine set A in the No. 1 power distribution room is the A1 utility section, the utility section between the starting transformer and the machine set B in the No. 1 power distribution room is the B1 utility section, and the utility section between the starting transformer and the machine set C in the No. 1 power distribution room is the C1 utility section; the common section between the starting transformer and the machine group A in the No. 2 power distribution room is the common section A2, the common section between the starting transformer and the machine group B in the No. 2 power distribution room is the common section B2, the common section between the starting transformer and the machine group C in the No. 2 power distribution room is the common section C2, and so on.

Further, the corresponding public sections among the power distribution rooms are connected through a connecting line, and the public sections are as follows: the A1 public section is connected with the A2 public section through a connecting line, and the A2 power utilization section is connected with the A3 public section through a connecting line; the B1 public section is connected with the B2 public section through a connecting line, and the B2 power utilization section is connected with the B3 public section through a connecting line; the C1 common segment is connected with the C2 common segment through a connecting line, and the C2 power utilization segment is connected with the C3 common segment through a connecting line; and so on.

Further, the tie line comprises a main cable arranged between the power distribution rooms, and a common lead arranged between the main cable and the common section; the auxiliary switch comprises a trolley switch and a trolley knife switch which are arranged on a common lead.

Furthermore, a switch cabinet for protecting the trolley switch is arranged at the position where the trolley switch is arranged, and the switch cabinet is connected with the main cable through a cable; the trolley disconnecting link is arranged on the isolation cabinet, the isolation cabinet is used for protecting the trolley disconnecting link, and the isolation cabinet is connected with the main cable through a cable.

Furthermore, a line incoming switch is connected between the starting transformer in each power distribution room and the unit; setting a line incoming switch of a starting transformer connected with a normally open unit as Q1, a line incoming switch of the starting transformer in a certain power distribution room as Q2, and a trolley switch newly added on a connecting line lead as Q3; the incoming line switch Q1, the incoming line switch Q2 and the newly-added trolley switch Q3 are electrically interlocked, and therefore it is ensured that only two of the switches can be switched on at the same time at any time.

Furthermore, the newly-added trolley switch Q3 and the trolley disconnecting link corresponding to the newly-added trolley switch are electrically interlocked, and when the Q3 is in a switching-on state, the isolation handcart is locked at a working position, so that the isolation handcart is prevented from being pulled under load.

Furthermore, a relay protection device is arranged between the incoming line switch Q1, the incoming line switch Q2 and the newly added trolley switch Q3, and the relay protection device is arranged in the interval of the switches.

Furthermore, a2 nd fixed value area is implanted in the relay protection device, and the 2 nd fixed value area is arranged in the corresponding relay protection device after the protection fixed value is checked.

(III) advantageous effects

The utility model provides a reduce unit connection device of net electricity power consumption down, compare with prior art, it has following beneficial effect:

(1) in the technical scheme, corresponding public sections among all power distribution rooms are connected through a connecting line, and the public sections for storing power supplies are connected through cables, so that the power supplies of other public sections can be used through the connected cables when other units are in a shutdown state and a starting transformer is in an overhaul state, and the power generated by the power plant is used; the use of off-grid power is reduced, and the economic benefit of the power plant is improved. Meanwhile, the starting transformer is in a shutdown standby state most of the time, and the shutdown starting transformer can be overhauled in a large amount of time.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. Under the prerequisite that does not deviate from the design concept of the utility model, the ordinary person in the art should fall into the protection scope of the utility model to the various changes and improvements that the technical scheme of the utility model made.

Example 1:

taking a No. 2 6kV power distribution room and a No. 3 6kV power distribution room in a certain power company as examples; two power distribution rooms are provided with 2 starting transformers and 4 generator sets. In 4 generating sets, 3 generating sets are in a standby state, and only 1 generating set is in an operating state.

A unit connecting device for reducing power consumption of off-grid electricity comprises a No. 2 6kV distribution room and a No. 3 6kV distribution room, wherein 6kV public sections are respectively arranged in the No. 2 kV distribution room and the No. 3 kV distribution room, and a No. 2 starting transformer and a No. 3 starting transformer which are connected with an electric grid are respectively arranged outside the No. 2 kV distribution room and the No. 3 kV distribution room; the low-voltage sides of the No. 2 starting transformer and the No. 3 starting transformer are respectively connected with the corresponding 6kV public sections through closed buses; and the No. 2 starting transformer and the No. 3 starting transformer use grid power supply when being started.

The No. 2 starting transformer is connected with an A unit and a B unit which are used for power generation through cables, and the A unit and the B unit are connected in parallel. The A unit comprises a No. 3 high-voltage station transformer A branch, and the No. 3 high-voltage station transformer A branch is connected with related electric equipment and power generation equipment; and a No. 4 high-voltage station transformer A branch connected with the No. 3 high-voltage station transformer A branch in parallel, wherein the No. 4 high-voltage station transformer A branch is connected with relevant electric equipment and power generation equipment. The unit B comprises a branch B of a No. 3 high-voltage station transformer, and the branch B of the No. 3 high-voltage station transformer is connected with relevant electric equipment and power generation equipment; and a No. 4 high-voltage station transformer B branch connected with the No. 3 high-voltage station transformer B branch in parallel, wherein the No. 4 high-voltage station transformer B branch is connected with relevant electric equipment and power generation equipment.

The No. 3 starting transformer is connected with an A unit and a B unit which are used for power generation through cables, and the A unit and the B unit are connected in parallel. The A unit comprises a No. 5 high-voltage station transformer A branch, and the No. 5 high-voltage station transformer A branch is connected with related electric equipment and power generation equipment; and a No. 6 high-voltage station transformer A branch connected with the No. 5 high-voltage station transformer A branch in parallel, wherein the No. 6 high-voltage station transformer A branch is connected with relevant electric equipment and power generation equipment. The unit B comprises a branch B of a No. 5 high-voltage station transformer, and the branch B of the No. 5 high-voltage station transformer is connected with relevant electric equipment and power generation equipment; and a No. 6 high-voltage station transformer B branch connected with the No. 5 high-voltage station transformer B branch in parallel, wherein the No. 6 high-voltage station transformer B branch is connected with relevant electric equipment and power generation equipment.

In this embodiment, the normally open units are a branch of a No. 5 high-voltage service transformer a and a branch of a No. 5 high-voltage service transformer B.

A second-stage public A2 section is arranged between the No. 2 starting transformer and the A unit, and an incoming line switch QA2 is arranged between the second-stage public A2 section and the No. 2 starting transformer; a second-stage public B2 section is arranged between the No. 2 starting transformer and the B unit, and a line incoming switch QB2 is arranged between the second-stage public B2 section and the No. 2 starting transformer.

A third-stage public A3 section is arranged between the No. 3 starting transformer and the A unit, and an incoming line switch QA1 is arranged between the third-stage public A3 section and the No. 3 starting transformer; a third-stage public B3 section is arranged between the No. 3 starting transformer and the B unit, and a service inlet switch QB1 is arranged between the third-stage public B3 section and the No. 3 starting transformer.

And fast switching devices are connected between the third-phase public A3 section and the third-phase public B3 section and the No. 3 starting transformer, and are installed in an electronic room. When the normally open unit is abnormal, the starting transformer connected with the normally open unit can be started, and the electric access of a power grid is used as a standby power supply to be accessed, so that the normal power utilization of the whole plant is ensured.

The second-stage public A2 segment is connected with the third-stage public A3 segment through a connecting line, and the second-stage public B2 segment is connected with the third-stage public B3 segment through a connecting line; the tie line includes a main cable provided between the No. 2 power distribution room and the No. 3 power distribution room, and a common wire provided between the main cable and the common section.

Associated auxiliary switches are installed on the interconnection lines, including a trolley switch QA3 disposed between the main cable and the third-phase utility A3 section and between the main cable, a trolley switch QB3 disposed between the main cable and the third-phase utility B3 section, and a trolley knife switch installed between the main cable and the second-phase utility a2 section and between the main cable and the second-phase utility B2 section.

Service switch QA1, service switch QA2 and newly-increased dolly switch QA3 electric interlock, service switch QB1, service switch QB2 and newly-increased dolly switch QB3 electric interlock ensure that can only close two of them switches simultaneously at any time.

The newly-added trolley switch QA3 is electrically interlocked with the corresponding trolley knife switch, the newly-added trolley switch QB3 is electrically interlocked with the corresponding trolley knife switch, and when the QA3 or QB3 is in a switch-on state, the isolation handcart corresponding to the newly-added trolley switch QB3 is locked at a working position, so that the isolation handcart is prevented from being pulled under load.

A switch cabinet for protecting the trolley switch is arranged at the newly-added trolley switch QA3 and the newly-added trolley switch QB3, and the switch cabinet is connected with the main cable through a cable; an isolation cabinet for protecting the trolley disconnecting link is arranged at the position where the trolley disconnecting link is arranged, and the isolation cabinet is connected with the main cable through a cable.

Be provided with relay protection device between service entrance switch QA1, service entrance switch QA2 and newly-increased dolly switch QA3 to and between service entrance switch QB2 and newly-increased dolly switch QB3, relay protection device set up in the interval of switch. The 2 nd fixed value area is implanted in the relay protection device, and the 2 nd fixed value area is arranged in the corresponding relay protection device after the protection fixed value is checked.

The working principle is as follows: when the machine set A and the machine set B in the power distribution room No. 2 are stopped for standby, the normally opened machine set No. 5 high-voltage station transformer A branched 6KV section standby power switch 6502 is closed, the No. 5 high-voltage station transformer B branched 6KV section standby power switch 6527 is closed, the newly added trolley switch QA3 and the newly added trolley switch QB3 are closed, and the newly added trolley disconnecting links corresponding to QA3 and QB3 of the connecting line are closed; disconnecting a line incoming switch QA2 and a line incoming switch QB2 which are connected with the No. 2 starting transformer, and separating a line incoming switch QA1 and a line incoming switch QB1 which are connected with the No. 3 starting transformer; and taking the third-phase public A3 section of the branch A of the No. 5 high-voltage service transformer A and the third-phase public B3 section of the branch B of the No. 5 high-voltage service transformer B as service power of the whole plant.

Claims

1. A unit connecting device for reducing power consumption of off-grid electricity comprises a plurality of power distribution rooms, wherein each power distribution room is provided with a starting transformer connected with a power grid; the method is characterized in that: each starting transformer is connected with a plurality of units for generating electricity through cables, and a public section is arranged between the plurality of units and the starting transformers connected with the plurality of units; and corresponding public sections among the power distribution rooms are connected through a connecting line, and an auxiliary switch is installed on the connecting line.

2. The unit connecting device for reducing power consumption of off-grid electricity according to claim 1, wherein: the power distribution room adopts a 6KV public power distribution room.

3. The unit connecting device for reducing power consumption of off-grid electricity according to claim 1, wherein: any one unit of the multiple units of the power distribution room can be regarded as a normally open unit, and the common sections of other units are connected with the common section of the normally open unit; a quick switching device is connected between a public section of the normally open unit and a starting transformer of the normally open unit, and the quick switching device is installed between the electrons.

4. The unit connecting device for reducing power consumption of off-grid electricity according to claim 1, wherein: the power distribution room comprises a No. 1 power distribution room, a No. 2 power distribution room and a No. 3 power distribution room … n power distribution room; a machine set A, a machine set B and a machine set C … N are arranged in the power distribution room; and a common section between the starting transformer of the N-number power distribution room and the N-number machine set is an Nn common section.

5. The unit connecting device for reducing power consumption of off-grid electricity according to claim 4, wherein: the corresponding public section between each power distribution room is connected through a connecting line as follows: the A1 public section is connected with the A2 public section through a connecting line, and the A2 public section is connected with the A3 public section through a connecting line; the B1 public section is connected with the B2 public section through a connecting line, and the B2 public section is connected with the B3 public section through a connecting line; the C1 public section is connected with the C2 public section through a connecting line, and the C2 public section is connected with the C3 public section through a connecting line; and so on.

6. A unit connecting device for reducing power consumption of off-grid electricity according to any one of claims 1-5, wherein: the connecting line comprises a main cable arranged between the power distribution rooms and a common lead arranged between the main cable and the common section; the auxiliary switch comprises a trolley switch and a trolley knife switch which are arranged on a common lead.

7. The unit connecting device for reducing power consumption of off-grid electricity according to claim 6, wherein: a switch cabinet for protecting the trolley switch is arranged at the trolley switch, and the switch cabinet is connected with the main cable through a cable; the trolley disconnecting link is provided with an isolation cabinet for protecting the trolley disconnecting link, and the isolation cabinet is connected with the main cable through a cable.

8. The unit connecting device for reducing power consumption of off-grid electricity according to claim 6, wherein: a line incoming switch is connected between the starting transformer in each power distribution room and the unit; setting a line incoming switch of a starting transformer connected with a normally open unit as Q1, a line incoming switch of the starting transformer in a certain power distribution room as Q2, and a trolley switch newly added on a connecting line lead as Q3; the incoming line switch Q1, the incoming line switch Q2 and the newly-added trolley switch Q3 are electrically interlocked, and only two of the switches can be switched on at any time; the newly-added trolley switch Q3 is electrically interlocked with the corresponding trolley knife switch, and when the Q3 is in a switch-on state, the isolation handcart is locked at a working position, and the isolation handcart is forbidden to be pulled under load.

9. The apparatus for reducing power consumption of an off-grid power supply unit as claimed in claim 8, wherein: relay protection devices are arranged among the incoming line switch Q1, the incoming line switch Q2 and the newly added trolley switch Q3, and the relay protection devices are arranged in intervals of the switches; the relay protection device is internally implanted with a2 nd fixed value area, and the 2 nd fixed value area is arranged in the corresponding relay protection device after the protection fixed value accounting.