Hand-in-hand system for replacing furnace rear concentrated section operation unit for power supply
By designing a hand-in-hand system in a first-stage unit with a voltage of 10kV for high-voltage plants, power complementarity is achieved using high-voltage transformers and contact switches, the problem of consuming a large amount of purchased electricity is solved every time the machine is shut down, and significant electricity bill savings are achieved.
Patent Information
- Application Number
- CN202422113212.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-29
AI Technical Summary
In a first-stage unit with a high-voltage plant voltage of 10kV, a large amount of purchased power is required to consume each time the machine is shut down, and the factory load that maintains the unit's standby state also needs to consume purchase power.
Design a hand-in-hand system to achieve power complementarity between the 10kV working bus segments through multiple high-voltage transformers and contact switches, avoiding the need to rely on the purchase of power provided by the high-voltage starter/stop transformer every time the machine is shut down.
Through the implementation of the hand-in-hand system, the purchase of electricity spent on maintaining the basic load of the unit factory is reduced every day, and it is estimated that 28,300 yuan will be saved every day.
Smart Images
Figure CN223024103U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hand-in-hand system for replacing the power supply of the operation unit in the centralized section behind the furnace. Background Art
[0002] For a certain company in Hubei, the high-voltage plant service voltage is 10 kV at the first level. Each unit is equipped with a single SFP-1170 MVA / 500 kV high-voltage plant service working split transformer to supply two sections of 10 kV working busbars (section A and section B). Among them, section 1A and section 2A of the 10 kV working busbar supply two sections of 10 kV make-up water, section A and section B; section 1B and section 2B of the 10 kV working busbar supply two sections of 10 kV centralized section behind the furnace, section A and section B. The whole plant has two units and is equipped with a single split transformer (on-load tap-changer) with a capacity of SFFZ-90000 / 110 MVA as the high-voltage starting / standby transformer.
[0003] The 10 kV make-up water (section A and section B) and the centralized section behind the furnace (section A and section B) of the whole plant have been interconnected, ensuring the flexibility in operation. Even during the outage of one unit, the common load and part of the unit load located in this section can still operate normally. However, since the 10 kV working busbar section of the unit's high-voltage plant service working split transformer only has obvious standby provided by the high-voltage starting / standby transformer, every time a unit shuts down, the load of the 10 kV working busbar section needs to be completed through the purchased power provided by the high-voltage starting / standby transformer. Content of the Utility Model
[0004] The purpose of the utility model is to provide a hand-in-hand system for replacing the power supply of the operation unit in the centralized section behind the furnace, aiming to solve the problem that the wiring mode of the 10 kV working busbar causes a large amount of purchased power to be consumed during each shutdown of a single unit, and the plant load for maintaining the standby state of the unit also consumes purchased power.
[0005] To solve the above problems, the technical solution of the utility model is as follows:
[0006] A hand-in-hand system for replacing the power supply of the operation unit in the centralized section behind the furnace includes a plurality of high-voltage transformers. There is a section behind the furnace between two high-voltage transformers. The high-voltage transformers are respectively connected to the working section A busbar and the working section B busbar through the first switch. The section behind the furnace includes a centralized section A busbar and a centralized section B busbar. A tie switch is connected between the centralized section A busbar and the centralized section B busbar. Two working section B busbars of the two high-voltage transformers are respectively connected to the centralized section A busbar and the centralized section B busbar through the second switch.
[0007] Two working section B busbars of the two high-voltage transformers are respectively connected to the centralized section A busbar and the centralized section B busbar through the third switch.
[0008] It also includes a startup and standby transformer, which is respectively connected to the working bus section A and the working bus section B through a fourth switch.
[0009] The beneficial effects of the present utility model are as follows: There is no need to modify the layout and installation, nor the overall wiring scheme. Since the make-up water A / B sections of this power plant are also designed with a tie switch, it can also be used as a medium to replace the post-furnace centralized section to supply power from the operating unit to the standby unit. The estimated savings in purchased electricity for the scheme: The purchased plant electricity used to maintain the basic load of the plant for the unit is estimated at 50,000 kWh per day, and calculated at 0.5657 yuan per kWh, which is 28,300 yuan per day. Brief Description of the Drawings
[0010] The present utility model will be further described below with reference to the drawings:
[0011] Figure 1 It is a structural schematic diagram of the present utility model.
[0012] In the figure: the first transformer 1, the startup and standby transformer 2, the second transformer 3, the working bus section A 4, the working bus section B 5, the centralized bus section B 6, the post-furnace section 7, the centralized bus section A 8, the second switch 9, the third switch 10, the fourth switch 11, the first switch 12, the tie switch 13. Detailed Embodiment
[0013] As Figure 1 shown, a hand-in-hand system for replacing the post-furnace centralized section to supply power to the operating unit includes two high-voltage transformers, which are respectively the first transformer 1 and the second transformer 3. The first transformer 1 and the second transformer 3 supply power to the first unit and the second unit respectively. There is a post-furnace section 7 between the two high-voltage transformers. The high-voltage transformers are respectively connected to the working bus section A 4 and the working bus section B 5 through two first switches 12. The post-furnace section 7 includes a centralized bus section A 8 and a centralized bus section B 6. A tie switch 13 is connected between the centralized bus section A 8 and the centralized bus section B 6. The two working bus sections B 5 of the two high-voltage transformers are respectively connected to the centralized bus section A 8 and the centralized bus section B 6 through a second switch 9. The two working bus sections B 5 of the two high-voltage transformers are respectively connected to the centralized bus section A 8 and the centralized bus section B 6 through a third switch 10. It also includes a startup and standby transformer 2, and the startup and standby transformer 2 is respectively connected to the working bus section A 4 and the working bus section B 5 through a fourth switch 11.
[0014] Scheme: Taking the first unit in operation and the second unit in standby as an example, the 10 kV working bus section B 5 of the first unit is used to supply power to the 10 kV post-furnace centralized bus section A 8 of the unit; and the tie switch 13 between the 10 kV post-furnace centralized bus section A and the 10 kV post-furnace centralized bus section B is used for hand-in-hand connection, so that the 10 kV post-furnace centralized bus section B is powered on, thereby making the 10 kV working bus section B of the second unit powered on to maintain the standby state of the unit.
[0015] Working principle and steps: Taking the operation of the first unit and the standby of the second unit as an example, when the first unit is operating, the 10kV working section A and the 10kV working section B are powered by the SFP-1170MVA / 500kV high-voltage transformer, that is, taken from the unit auxiliary power. At this time, the second switch 9 and the third switch 10 can be closed to supply power to the 10kV busbar 8 after the boiler. After determining that the 10kV busbar 8 after the boiler operates stably, the two connection switches 13 after the boiler are closed successively to connect the 10kV busbar 8 after the boiler and the concentrated busbar 6 in section B hand in hand.
[0016] After checking and determining that the 10kV busbar 6 in the concentrated section after the boiler operates stably, check and determine that the first switch 12 and the fourth switch 11 in the working section B of the second unit are tripped in the test position. The second switch 9 and the third switch 10 are closed successively (since the 10kV concentrated section after the boiler is the upper level at this time) to supply power to the working section B of the second unit. Through the way of connecting the 10kV concentrated sections A and B after the boiler hand in hand, the operating first unit maintains the standby of the second unit.
[0017] The content described in the embodiments of this specification is only a list of the implementation forms of the utility model concept. The protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present utility model also extends to equivalent technical means that those skilled in the art can think of according to the utility model concept.
Claims
1. A hand-in-hand system for replacing the power supply of the concentrated section running unit behind the furnace, characterized in that: It includes multiple high-voltage transformers, and a furnace rear section is arranged between two high-voltage transformers. The high-voltage transformers are connected to the working section A bus and the working section B bus through a first switch respectively. The furnace rear section includes a centralized section A bus and a centralized section B bus. A connecting switch is connected between the centralized section A bus and the centralized section B bus. The two working section B buses in the two high-voltage transformers are connected to the centralized section A bus and the centralized section B bus respectively through a second switch.
2. A hand-in-hand system for replacing the power supply of the concentrated section running units behind the furnace according to claim 1, characterized in that: The two working B-section busbars in the two high-voltage transformers are respectively connected to the centralized A-section busbar and the centralized B-section busbar through the third switch.
3. A hand-in-hand system for replacing the power supply of the concentrated section running unit after the furnace according to claim 1 or 2, characterized in that: It also includes a starting and standby transformer, which is connected to the working section A bus and the working section B bus through a fourth switch.