CN213400805U - Reliable main cooling water supply and drainage system that becomes - Google Patents
Reliable main cooling water supply and drainage system that becomes Download PDFInfo
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- CN213400805U CN213400805U CN202021383112.7U CN202021383112U CN213400805U CN 213400805 U CN213400805 U CN 213400805U CN 202021383112 U CN202021383112 U CN 202021383112U CN 213400805 U CN213400805 U CN 213400805U
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Abstract
The utility model relates to a reliable main cooling water that becomes supplies drainage system for the cooling water that many owner become supplies the drainage, and every owner becomes and sets up its cooler respectively, according to main change and the different operating condition of unit, sets up multichannel water supply and drainage channel, including full-load water intaking pipeline, the empty load water intaking pipeline, main drainage pipe way, the reserve drainage pipe way that all set up of every owner become, still include the empty load water supply contact pipe, the empty load drainage contact pipe that the whole factory set up in unison. The utility model discloses a rationally set up main transformer cooler water intaking and drainage channel, guaranteed the reliability that main transformer cooling water supplied row.
Description
Technical Field
The utility model belongs to the technical field of hydraulic and hydroelectric engineering, especially, relate to a reliable main cooling water supply and drainage system that becomes is applicable to pumped storage power station.
Background
The main transformer (hereinafter referred to as main transformer) is one of important devices for ensuring safe and effective operation of the pumped storage power station. Along with the gradual increase of the installed capacity of the existing pumped storage power station, the capacity of a main transformer is gradually increased, and the requirement on the reliability of work is higher and higher. Once the main transformer breaks down, a serious safety accident can be caused, and meanwhile, along with equipment maintenance and replacement, not small economic loss can be caused to a power station. Therefore, the safety and the stability of the main transformer are guaranteed, and the method has very important significance for the pumped storage power station. The main transformer of the pumped storage power station generally adopts a forced oil circulation water-cooled type, and a circulating oil system of the main transformer is cooled by cooling water, so that the purpose of controlling the temperature of the main transformer is achieved. Once the main transformer cooling water supply and drainage system breaks down, the temperature of the main transformer is increased, and accidents such as winding insulation aging, insulation oil degradation and breakdown are caused.
Because of the characteristics of the pumped storage power station, the head/lift ratio is high, and an underground factory building type structure is generally adopted at present. Because the main transformer is installed in the underground factory building, for the power station of ground factory building, the condition is more limited, and this brings many difficulties for the design of main transformer cooling water system. Meanwhile, the main transformer of the pumped storage power station has more operating conditions and comprises no-load, full-load, partial-load and reverse power transmission operating conditions, and the unit also has multiple states of operation, shutdown, overhaul, test and the like, so that the reliable main transformer cooling water supply and drainage system is designed to meet the cooling requirements of the main transformer of the pumped storage power station under various operating conditions, the operating stability of the power station is improved, the main transformer faults can be reduced, and the economic loss is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: aiming at the problems, the reliable main transformer cooling water supply and drainage system is provided. The utility model adopts the following technical scheme:
the utility model provides a reliable owner becomes cooling water supply and drainage system for the cooling water supply and drainage of many owner changes, every owner becomes and sets up its cooler, its characterized in that respectively: the cooling water supply and drainage system of the main transformer is provided with a plurality of paths of water supply and drainage channels according to different operation working conditions of the main transformer and the unit;
the main transformer cooling water supply and drainage system comprises a full-load water taking pipeline, a no-load water taking pipeline, a main drainage pipeline and a standby drainage pipeline which are all arranged on each main transformer, and further comprises a no-load water supply communication pipe and a no-load drainage communication pipe which are uniformly arranged in the whole plant.
Furthermore, the full-load water taking pipeline takes water from the unit technology water supply main pipe and is connected to an inlet of a main transformer cooler; the no-load water taking pipeline takes water from the no-load water supply connecting pipe and is connected to an inlet of the main transformer cooler; the main drainage pipeline is connected with an outlet of the main transformer cooler and a unit technology drainage main pipe; the spare drainage pipeline is connected with the outlet of the main transformer cooler and the no-load drainage communication pipe; the idle load communication water supply pipe connects each idle load water taking pipeline in parallel and is connected to a factory public water supply main pipe; the idle load drainage connecting pipe connects the standby drainage pipelines in parallel.
Furthermore, a check valve is arranged on the fully-loaded water taking pipeline;
furthermore, a pressurizing water pump is arranged on the no-load water taking pipeline.
Furthermore, the no-load drainage communication pipe is provided with an initial drainage pipe, the initial drainage pipe is connected to a water collecting well in a factory, and the initial drainage pipe is provided with a normally closed isolation valve.
Furthermore, bypass pipes are arranged on two sides of a pressure pump of a main transformer no-load water taking pipeline which is used for backward power transmission, and a normally closed isolation valve is installed on each bypass pipe.
Furthermore, the main transformer cooling water supply and drainage system is suitable for underground workshop type pumped storage power stations, a unit technology water supply and drainage system of the system takes water from tail water and discharges the water to the tail water, and a whole plant public water supply system takes water from the tail water.
The utility model has the advantages that: through rationally setting up main change cooler water intaking and drainage channel, guaranteed the reliability that main change cooling water supplied and drained, had following several beneficial effect:
1. under different working conditions, the system can ensure the effective supply of the cooling water of the main transformer.
2. The no-load drainage communication pipe is arranged, so that when the unit is overhauled or a tunnel is overhauled, the drainage problem of a main transformer when a main drainage channel does not meet the condition is solved by means of drainage of other units.
3. The initial-stage drain pipe is arranged and used as a main transformer cooling water drainage channel when all the units do not have drainage conditions, and effective operation of a main transformer is guaranteed.
4. The bypass pipe is additionally arranged in the cooling water supply and drainage system of the main transformer which serves as the power transmission task, so that the problem that the pressurizing water pump automatically flushes and rotates when drainage has no back pressure can be solved.
Drawings
Fig. 1 is a system diagram of the present invention.
Fig. 2 is a schematic diagram of a technical water supply system according to an embodiment of the present invention.
Detailed Description
The cooling water supply and drainage system of the main transformer is provided with a plurality of paths of water supply and drainage channels according to different operation working conditions of the main transformer and the unit.
The cooling water supply and drainage system of the main transformer mainly comprises a full-load water taking pipeline, a no-load water taking pipeline, a main drainage pipeline and a standby drainage pipeline which are all arranged on each main transformer, a no-load water supply communication pipe, a no-load drainage communication pipe and an initial drainage pipe which are all uniformly arranged in the whole plant, and a water pump, a valve, an instrument and the like which are arranged on each pipeline.
As shown in fig. 1, the present embodiment is a main transformer cooling water supply and drainage system applied to a pumped storage power station. The power station is provided with four 1# to 4# units, and the 1# to 4# units respectively correspond to 1# to 4# main transformers by adopting a unit wiring mode. According to the installation and construction sequence of the power station, the 1# unit is supposed to be firstly put into operation, and the 1# main transformer is responsible for reverse power transmission.
In order to explain the principle of the main transformer cooling water supply and drainage system, the technical water supply system principle of the power station is simply introduced. The technical water supply system sketch of the power station is shown in figure 2, which is also a typical technical water supply system sketch of an underground powerhouse type pumped storage power station. The technical water supply system of the power station comprises a unit technical water supply system and a whole-plant public water supply system, wherein each unit of the unit technical water supply system is set, and the whole-plant public water supply system and the power station are set. The unit technology water supply supplies water for users such as a main transformer and each bearing cooler of a unit, and a water source is taken from the front of the tailrace tunnel accident gate 600, is supplied to the users after passing through the water pump, the water filter and the unit technology water supply main pipe 1, and is discharged to the tailrace tunnel through the unit technology water discharge main pipe 6. The water supply pressure of the unit technology water supply system is higher due to the pressurization of the water pump. The whole plant public water supply system supplies water for users such as main transformer no-load users, air conditioners, air compressors, deep well pumps and the like, and water sources are taken from No. 1 and No. 4 unit tail water tunnels to supply water to the users after passing through water filters and a whole plant public water supply main pipe 10. Because the water is directly taken without being pressurized by the water pump, the water supply pressure of the public water supply system of the whole plant is lower.
With the above brief introduction regarding the technical water supply system, the main transformer cooling water supply and drainage system of the power station is described in the following. This cooling water supply and drainage system that power station 1# -4 # owner becomes configuration is unanimous basically, and every owner becomes to set up two tunnel water supplies altogether, is respectively through 1 water intaking of unit technology water main and no-load contact delivery pipe 9 water intaking, sets up two tunnel drains simultaneously, is respectively through 6 drainage of unit technology water main and through 7 drainage of no-load contact drain pipe. The system mainly comprises a full-load water taking pipeline 2, a no-load water taking pipeline 3, a main drainage pipeline 4, a standby drainage pipeline 5, a no-load water supply communication pipe 9, a no-load drainage communication pipe 7 and an initial drainage pipe 8 which are arranged in a whole plant, and a water pump, a valve, an instrument and the like which are arranged on each pipeline. Because the 1# main transformer undertakes the task of power transmission, compared with the 2# to 4# main transformers, the no-load water taking pipeline 3 is provided with a plurality of bypass pipes 304.
The following takes the main transformer 1# as an example to specifically describe the system structure and the water supply and drainage method.
A water taking pipeline 2 fully loaded is connected with a unit technical water supply main pipe 1 and an inlet of a 1# main transformer cooler, and is a water supply channel of the 1# main transformer cooler when a unit normally operates. A check valve 201 is installed on the fully loaded water taking pipeline 2, and the check valve 201 is used for preventing No. 1 main transformer idle water supply from flowing back to a water supply main pipe of a unit. The no-load water taking pipeline 3 is connected with the no-load water supply connecting pipe 9 and the inlet of the 1# main transformer cooler and is a water supply channel of the 1# main transformer cooler under the working conditions of unit shutdown, overhaul, reverse power transmission and the like. Two pressurizing water pumps 301 and 302 are arranged on the no-load water taking pipeline 3, one is main and the other is standby, and corresponding valves and instruments are arranged in front of and behind the water pumps according to the conventional method. Two sides of the water pumps 301 and 302 are connected with a bypass pipe 304 in parallel, an isolation valve 303 is installed on the bypass pipe, the bypass pipe 304 is used when the main transformer drains water without back pressure during initial power transmission, and the isolation valve 303 is in a normally closed state due to the back pressure during normal use. The water source of the no-load water supply communication pipe 9 is taken from a whole plant public water supply main pipe 10, and the water supply pressure of a whole plant public water supply system is lower, so that two pressurizing water pumps 301 and 302 are arranged on the no-load water taking pipeline 3 to meet the water supply requirement of the No. 1 main transformer cooling area device. The main drainage pipeline 4 is connected with the unit technology drainage main pipe 6 and the outlet of the 1# main transformer cooler and is a cooling water drainage channel of the 1# main transformer when the unit normally operates or stops. The main drain line 4 is provided with an isolation valve 401, which is a normally open valve. The spare drainage pipeline 5 is connected with the idle-load drainage communication pipe 7 and the outlet of the 1# main transformer cooler and is a drainage channel for cooling the 1# main transformer during unit maintenance, tunnel maintenance and reverse power transmission working conditions. An isolation valve 501 is installed on the spare drain line 5, and the valve is a normally closed valve. And the idle load drainage communication pipe 7 connects the outlets of the 1# -4 # main transformer coolers. When the technical drainage main pipe 6 of the No. 1 unit does not have drainage conditions, cooling water is drained to other units with drainage conditions through the spare drainage pipeline 5 and the idle drainage communication pipe 7. Meanwhile, one path of initial-stage drain pipe 8 is led up to a water collecting well on the no-load communication drain pipe 7 and is used for draining main transformer cooling water during initial reverse power transmission. An isolation valve 801 is provided in the initial drain pipe 8.
Aiming at different operation conditions of a 1# unit and a main transformer, the water supply and drainage method and the path are as follows:
working condition 1: normal operation of machine set
At the moment, the 1# main transformer runs in full load or partial load, water can be taken out and drained before the tail water tunnel accident gate, a unit technology water supply system is normal, cooling water of the 1# main transformer cooler is taken from the unit technology water supply main pipe 1 and flows through the full-load water taking pipeline 2, the main transformer cooler and the main drainage pipeline 4 and then is drained to the unit technology drainage main pipe 6. In this condition, isolation valves 303, 501 and 801 are closed and water pumps 301 and 302 are shut down.
Working condition 2: machine unit halt
At the moment, the 1# main transformer runs in an idle load mode, water cannot be taken out and drained from the front of a tail water tunnel accident gate, a unit technology water supply system is closed, cooling water of the 1# main transformer cooler is taken from an idle load water supply connecting pipe 9 and flows through a water pump branch pipe on an idle load water taking pipeline 3, the main transformer cooler and a main drainage pipeline 4 and then is drained to a unit technology drainage main pipe 6. In this condition, water pump 301 or 302 is running and isolation valves 303, 501 and 801 are closed.
Working condition 3: machine set overhaul or tailrace tunnel overhaul
At the moment, the No. 1 main transformer runs in an idle load mode, water cannot be taken out and drained before a tail water tunnel accident gate, a unit technology water supply system is closed, cooling water of the No. 1 main transformer cooler is taken from an idle load water supply communication pipe 9, flows through a water pump branch pipe on an idle load water taking pipeline 3, the main transformer cooler, a standby drainage pipeline 5 and an idle load communication drainage pipe 7, then flows through standby drainage pipes and main drainage pipes of other units, and is finally drained to a unit technology drainage main pipe of the other units. In this condition, water pump 301 or 302 is running and isolation valves 303, 401 and 801 are closed.
Working condition 4: reverse power transmission
At the moment, the 1# main transformer runs in a low-load mode, all units do not have a water passing condition, water cannot be taken out and drained before a tail water tunnel accident gate, a unit technical water supply system is closed, cooling water of the 1# main transformer cooler is taken from an idle-load water supply communication pipe 9, and finally drained to a water collecting well after flowing through a bypass pipe 304, a main transformer cooler, a standby drainage pipeline 5, an idle-load communication drainage pipe 7 and an initial drainage pipe 8 on an idle-load water taking pipeline 3. In this condition, water pump 301 or 302 is shut down, isolation valve 401 is closed, and isolation valves 303, 501 and 801 are opened.
The main transformers of other units do not undertake the task of power transmission, and compared with a 1# main transformer cooling water system, the main transformer cooling water system has one path of bypass pipe 304, the configuration of other systems is consistent, and the operation method is the same. The isolation valves shown in the present system are merely illustrative of the principles and may be of the type that is manual or automatic. Meanwhile, the system also needs to be configured with instruments according to corresponding specifications and requirements, and the system is not focused on the system and is not repeated herein.
In the embodiment, a pumped storage power station formed by four units is taken as an example, and other hydropower stations adopting similar water supply modes can be used as references.
The above description is only for the specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any person skilled in the art is in the field of the present invention, and all the changes or modifications are covered in the protection scope of the present invention.
Claims (6)
1. The utility model provides a reliable owner becomes cooling water supply and drainage system for the cooling water supply and drainage of many owner changes, every owner becomes and sets up its cooler, its characterized in that respectively: the main transformer cooling water supply and drainage system is provided with a plurality of paths of water supply and drainage channels;
the main transformer cooling water supply and drainage system comprises a full-load water taking pipeline, a no-load water taking pipeline, a main drainage pipeline and a standby drainage pipeline which are all arranged on each main transformer, and also comprises a no-load water supply communication pipe and a no-load drainage communication pipe which are uniformly arranged;
the full-load water taking pipeline takes water from the unit technology water supply main pipe and is connected to an inlet of a main transformer cooler; the no-load water taking pipeline takes water from the no-load water supply connecting pipe and is connected to an inlet of the main transformer cooler; the main drainage pipeline is connected with an outlet of the main transformer cooler and a unit technology drainage main pipe; the spare drainage pipeline is connected with the outlet of the main transformer cooler and the no-load drainage communication pipe; the no-load communication water supply pipe connects each no-load water taking pipeline in parallel and is connected to the public water supply main pipe; the idle load drainage connecting pipe connects the standby drainage pipelines in parallel.
2. The reliable main transformer cooling water supply and drainage system of claim 1, wherein: and a check valve is arranged on the full-load water taking pipeline.
3. The reliable main transformer cooling water supply and drainage system of claim 1, wherein: and a pressurizing water pump is arranged on the no-load water taking pipeline.
4. The reliable main transformer cooling water supply and drainage system of claim 1, wherein: the no-load drainage communication pipe is provided with one initial-stage drainage pipe, the initial-stage drainage pipe is connected to a water collecting well in a factory, and the initial-stage drainage pipe is provided with a normally closed isolation valve.
5. The reliable main transformer cooling water supply and drainage system of claim 1, wherein: bypass pipes are arranged on two sides of a pressure pump of a main transformer no-load water taking pipeline which is used for backward power transmission, and a normally closed isolation valve is installed on each bypass pipe.
6. The reliable main transformer cooling water supply and drainage system of claim 1, wherein: the main transformer cooling water supply and drainage system is suitable for underground workshop type pumped storage power stations, the unit technology water supply and drainage system takes water from tail water and discharges water to tail water, and the public water supply system takes water from the tail water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021383112.7U CN213400805U (en) | 2020-07-14 | 2020-07-14 | Reliable main cooling water supply and drainage system that becomes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021383112.7U CN213400805U (en) | 2020-07-14 | 2020-07-14 | Reliable main cooling water supply and drainage system that becomes |
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| CN213400805U true CN213400805U (en) | 2021-06-08 |
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| CN202021383112.7U Active CN213400805U (en) | 2020-07-14 | 2020-07-14 | Reliable main cooling water supply and drainage system that becomes |
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