CN204089336U - A kind of electric power system of the electic protection control unit for generating set - Google Patents
A kind of electric power system of the electic protection control unit for generating set Download PDFInfo
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- CN204089336U CN204089336U CN201420532346.1U CN201420532346U CN204089336U CN 204089336 U CN204089336 U CN 204089336U CN 201420532346 U CN201420532346 U CN 201420532346U CN 204089336 U CN204089336 U CN 204089336U
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- generating set
- power supply
- transfer switch
- automatic transfer
- control unit
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Abstract
The utility model proposes a kind of electric power system of the electic protection control unit for generating set.Comprise: transmission system electrical network (1); Utility grid (2); The main transformer (3) be connected with transmission system electrical network (1); The first double power supply automatic transfer switch (4) be connected with main transformer (3) and utility grid (2); The DC charging device (5) be connected with the first double power supply automatic transfer switch (4); The direct current batteries (6) be connected with DC charging device (5); The inverter (7) be connected with direct current batteries (6); The second double power supply automatic transfer switch (8) be connected with inverter (7) and the first double power supply automatic transfer switch (4); The electic protection control unit (9) of generating set, is connected with the second double power supply automatic transfer switch (8); Generating set (10) or Generator Auxiliary (11), be connected with the electic protection control unit (9) of generating set.
Description
Technical field
The utility model relates to technical field of power generation, more specifically, relates to a kind of electric power system of the electic protection control unit for generating set.
Background technology
Hydroelectric station is the integration engineering facility that water can be converted to electric energy.Generally comprise the reservoir and Diversion system of hydropower station, power plant building, electromechanical equipment etc. that are formed by dash, outlet structure.The high water level water of reservoir flows into factory building promotion turbine-generator units through diversion system and sends electric energy, then through step-up transformer, switchyard and transmission line input electrical network.The Main Function of the electic protection control unit of generating set is exactly the safety of protecting control unit.
Fig. 1 is the power supply process schematic diagram of the electic protection control unit of generating set in prior art.
As shown in Figure 1, in prior art, the electic protection control unit of unit is supported by transmission system electrical network.Now the path of Protection control system is: " electic protection control unit (4)-→ generating set (5) of transmission system electrical network (1)-→ main transformer (2) and station transformer (3)-→ generating set and Generator Auxiliary (6) ".
The shortcoming of this operational mode comprises:
(1), poor stability.When transmission system electrical network, main transformer or station transformer break down; the electic protection control unit of generating set and Generator Auxiliary will be made to lose power supply supply, thus the security of the lives and property of serious harm unit operation safety and the people.
(2), deficiency in economic performance.Need to purchase station transformer to the supply of the electic protection control unit and Generator Auxiliary power supply that meet generating set; increase power station cost of investment, operating cost and maintenance cost; also leave the potential safety hazards such as station transformer accident, even cause the serious electrical accident that the electic protection control unit of generating set lost efficacy because power supply disappears.
(3), independence is poor.When the supply discontinuity of transmission system electric network source or main transformer and station transformer break down, because do not have power supply to be supplied to Generator Auxiliary, so inlet gate, water inlet gate valve, the electronic wicket gates of the hydraulic turbine, oil pressure unit, pneumatic shuttle, brake gear, suction pump and dam hoist etc. electric equipment all can not normally be opened or close, certainly also just can not starter-generator group and generating electricity by way of merging two or more grid systems, cause the passive situation such as dependence transmission system electrical network completely.Therefore, the independence that hydroelectric station can enough generate electricity is just poor, and the independence of self-protection is also just poorer.
(4), should acute difference.When natural calamity occurs, hydroelectric station often needs emergency power supply to process some emergency episodes especially, water logging workshop accident is prevented as started suction pump draining, unlatching dam hoist discharges water and prevents dam collapse accident etc., so easily lead to great property loss and personnel casualty accidents.
Utility model content
The utility model execution mode proposes a kind of electric power system of the electic protection control unit for generating set, thus reduces costs and improve safety in operation.
The technical scheme of the utility model execution mode is as follows:
For an electric power system for the electic protection control unit of generating set, comprising:
Transmission system electrical network (1), for providing main transformer power supply;
Utility grid (2), for providing the first service power;
The main transformer (3) be connected with transmission system electrical network (1), for providing the second service power;
The first double power supply automatic transfer switch (4) be connected with main transformer (3) and utility grid (2), double power-supply automatic transferring is performed between the second service power that the first service power of providing at utility grid (2) and main transformer (3) provide, wherein the supply path of the first service power that provides of utility grid (2) is in running order, and the supply path of the second service power that main transformer (3) provides is in hot stand-by duty;
The DC charging device (5) be connected with the first double power supply automatic transfer switch (4), for by the first double power supply automatic transfer switch (4) the alternating current of service power of current conversion change direct current into;
The direct current batteries (6) be connected with DC charging device (5), for laying in direct current;
The inverter (7) be connected with direct current batteries (6), the direct current for direct current batteries (6) being laid in changes industrial-frequency alternating current into serve as the 3rd service power;
The second double power supply automatic transfer switch (8) be connected with inverter (7) and the first double power supply automatic transfer switch (4), for the 3rd service power that provides at inverter (7) and the first double power supply automatic transfer switch (4) current conversion service power between perform double power-supply automatic transferring, wherein the first double power supply automatic transfer switch (4) the supply path of service power of current conversion in running order, and the supply path of the 3rd service power that inverter (7) provides is in hot stand-by duty;
The electic protection control unit (9) of generating set, is connected with the second double power supply automatic transfer switch (8), for the protection of with control generating set (10) or Generator Auxiliary (11);
Generating set (10) or Generator Auxiliary (11), be connected with the electic protection control unit (9) of generating set.
Preferably, described Generator Auxiliary (11) comprises inlet gate, water inlet gate valve, the electronic wicket gates of the hydraulic turbine, oil pressure unit, pneumatic shuttle, brake gear, suction pump and dam hoist.
Preferably, described inverter (7) is active inverter or passive inverter.
As can be seen here; in the utility model; utilize former electic protection control unit; retain and inherit former electic protection controlling functions, and only needing simple and easyly to install the remarkable improvement that the first double power supply automatic transfer switch (4), charged with direct current device (5), direct current batteries (6), inverter (7) and the second double power supply automatic transfer switch (8) just can realize the electic protection control unit of generating set additional.The feature of this design is safety and efficiently.Both ensure unit safety, saved again hydropower investment, operation and maintenance cost, be applicable to the electic protection control unit of various generating set, hydroelectric station or Water logged area etc. that particularly transmission system electrical network is very unstable.Certainly, that often there is natural calamity and serious harm social public security with hydroelectric station that the is security of the lives and property or the Water logged area having flood control to require, pond on a hill and reservoir etc., particularly applicable.
Accompanying drawing explanation
Fig. 1 is the power supply process schematic diagram of the electic protection control unit of generating set in prior art;
Fig. 2 is the electric power system structure chart for the electic protection control unit of generating set in the utility model;
Fig. 3 is utility model generating set protection circuit figure.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
In the utility model, supplying power supply by single transmission system electrical network (1) changes into by transmission system electrical network (1), utility grid (2) and inverter (7) supply power supply, save station transformer, thus investment reduction, operation and maintenance cost.
In the utility model; utilize original electic protection control unit; retain and inherit former electic protection controlling functions (not repeating them here), and only needing simple and easyly to install the remarkable improvement that the first double power supply automatic transfer switch (4), charged with direct current device (5), direct current batteries (6), inverter (7) and the second double power supply automatic transfer switch (8) just can realize the electic protection control unit of generating set additional.
Feature of the present utility model is safety and efficiently.Both ensure unit safety, save again hydropower investment, operation and maintenance cost.Be applicable to the electic protection control unit of various generating set, hydroelectric station or Water logged area etc. that particularly transmission system electrical network is very unstable.Certainly, that often there is natural calamity and serious harm social public security with hydroelectric station that the is security of the lives and property or the Water logged area having flood control to require, pond on a hill and reservoir etc., particularly applicable.
Fig. 2 is the electric power system structure chart for the electic protection control unit of generating set in the utility model.
As shown in Figure 2, the electic protection control unit of generating set, comprising:
Transmission system electrical network (1), for providing main transformer power supply; Namely provide input power for main transformer (3);
Utility grid (2), for providing the first service power;
The main transformer (3) be connected with transmission system electrical network (1), for providing the second service power; The input power namely provided for transmission system electrical network (1) performs reduced pressure operation, is converted to the second service power of applicable station-service;
The first double power supply automatic transfer switch (4) be connected with main transformer (3) and utility grid (2), double power-supply automatic transferring is performed between the second service power that the first service power of providing at utility grid (2) and main transformer (3) provide, wherein the supply path of the first service power that provides of utility grid (2) is in running order, and the supply path of the second service power that main transformer (3) provides is in hot stand-by duty; That is, the first service power that utility grid (2) provides is as conventional power supply, and the second service power that main transformer (3) provides is as stand-by power supply.When the first service power catastrophic failure that utility grid (2) provides or when having a power failure, the first double power supply automatic transfer switch (4) is transformed into the second service power that main transformer (3) provides automatically.
The DC charging device (5) be connected with the first double power supply automatic transfer switch (4), for by the first double power supply automatic transfer switch (4) the alternating current of service power of current conversion change direct current into; That is, when the first service power that utility grid (2) provides normally works, DC charging device (5) is converted to direct current for the alternating current of the first service power provided by utility grid (2); When the first service power that utility grid (2) provides breaks down or has a power failure, first double power supply automatic transfer switch (4) is transformed into the second service power that main transformer (3) provides automatically, and now DC charging device (5) is converted to direct current for the alternating current of the second service power provided by main transformer (3).
The direct current batteries (6) be connected with DC charging device (5), for laying in direct current;
The inverter (7) be connected with direct current batteries (6), the direct current for direct current batteries (6) being laid in changes industrial-frequency alternating current into serve as the 3rd service power;
The second double power supply automatic transfer switch (8) be connected with inverter (7) and the first double power supply automatic transfer switch (4), for provide at inverter (7) the 3rd service power and the first double power supply automatic transfer switch (4) current conversion service power between perform double power-supply automatic transferring, wherein the first double power supply automatic transfer switch (4) the supply path of service power of current conversion in running order, and the supply path of the 3rd service power that inverter (7) provides is in hot stand-by duty; That is, the first double power supply automatic transfer switch (4) the service power of current conversion as conventional power supply, the 3rd station-service that inverter (7) provides is as stand-by power supply.When the first double power supply automatic transfer switch (4) current conversion service power catastrophic failure or have a power failure time, the second double power supply automatic transfer switch (4) is transformed into the 3rd service power that inverter (7) provides automatically.
The electic protection control unit (9) of generating set, is connected with the second double power supply automatic transfer switch (8), for the protection of with control generating set (10) and Generator Auxiliary (11);
Generating set (10) or Generator Auxiliary (11), be connected with the electic protection control unit (9) of generating set.
In fig. 2, utility grid (2) provide the supply path of the first service power and the first double power supply automatic transfer switch (4) the service power of current conversion in running order, and the supply path of the second service power that main transformer (3) provides and the 3rd service power that inverter (7) provides is in hot stand-by duty.When the supply path of the first service power that utility grid (2) provides or the service power that the first double power supply automatic transfer switch (4) provides breaks down, the supply path of the second service power that main transformer (3) provides or the 3rd service power that inverter (7) provides can provide power supply function.
Inverter (7) is for being transformed into direct current energy (battery, accumulator jar) alternating current (be generally 220V, 50Hz is sinusoidal wave), and it is made up of inverter bridge, control logic and filter circuit.Divide according to source and course character, inverter (7) can comprise
(1), active inverter: be the electric current made in current circuit, be connected with electrical network at AC and directly do not access the inverter of load;
(2), passive inverter: make the electric current in current circuit, be not connected with electrical network at AC and directly access the inverter of load (being namely the alternating current supply load of a certain frequency or adjustable frequency DC inverter).
The purposes of the first double power supply automatic transfer switch (4) and the second double power supply automatic transfer switch (8), be exactly that a conventional road, a road is for subsequent use in simple terms, when conventional electric catastrophic failure or when having a power failure, by double power supply automatic transfer switch, automatically put on stand-by power supply.Here, the service power that utility grid (2) and the first double power supply automatic transfer switch (4) provide is as primary power cource, and the service power that main transformer (3) provides and the service power that inverter (7) provides are as stand-by power supply.
In conjunction with above-mentioned explanation, the utility model is analyzed, wherein:
1, technical Analysis: because continue to use electic protection control unit and the Generator Auxiliary of generating set; just change utility grid and inverter supply power supply into; as long as it is just passable namely the electricity consumption power supply wiring of former protecting control unit power supply and Generator Auxiliary to be received the second double power supply automatic transfer switch, so be simple, feasible technically.
2, safety analysis:
Shown in Fig. 1, the electic protection control unit of generating set and Generator Auxiliary are only provided safeguard by main transformer and station transformer.This single supportive approach is:
" electic protection control unit (4)-→ generating set (5) of transmission system electrical network (1)-→ main transformer (2) and station transformer (3)-→ generating set and Generator Auxiliary (6) ".
Shown in Fig. 2, the electic protection control unit of generating set and Generator Auxiliary provide three guarantees by transmission system electrical network, utility grid and inverter, and are three complementary guarantees.This three paths is respectively:
Article 1: " electic protection control unit (9)-→ generating set (10) of transmission system electrical network (1)-→ main transformer (3)-→ the first double power supply automatic transfer switch (4)-→ the second double power supply automatic transfer switch (8)-→ generating set and Generator Auxiliary (11) ";
Article 2: " electic protection control unit (9)-→ generating set (10) of utility grid (2)-→ the first double power supply automatic transfer switch (4)-→ the second double power supply automatic transfer switch (8)-→ generating set and Generator Auxiliary (11) ";
Article 3: " electic protection control unit (9)-→ generating set (10) of direct current batteries (6)-→ inverter (7)-→ the second double power supply automatic transfer switch (8)-→ generating set and Generator Auxiliary (11) ".
Generally, the electic protection control unit of generating set and Generator Auxiliary provide power supply guarantee by Article 2 path; And Article 1 and Article 3 path are in hot stand-by duty, and are preparing at any time and put into operation immediately when Article 2 path goes wrong.
From the contrast and analysis of above-mentioned Fig. 1 and Fig. 2; reach a conclusion apparently: relative to the electic protection control unit of generating set in prior art; in utility model, the electic protection control unit of generating set is safe, and many at least two paths, add two parts of guarantees.
Below, in conjunction with example, go on to say the improvement place of the utility model system:
Fig. 3 is generating set electric control circuit figure in utility model, and this sentences water inlet electric butterfly valve is example explanation.
As seen from Figure 3, one end of generator circuit breaker auxiliary contact FDL is connected with change over switch QK1, and one end is connected with one end of eliminating magnetism of generator switch auxiliary contact MK in addition; Other one end of eliminating magnetism of generator switch auxiliary contact MK is connected with generator synchronous switch TQ, generator synchronous switch TQ is connected with one end of the auxiliary contact 2ZJ1 of auxiliary relay 2ZJ again, and other one end of auxiliary relay 2ZJ1 is connected with the coil of auxiliary relay 1ZJ.
In figure 3:
Auxiliary relay 1ZJ closes water inlet electric butterfly valve, and its outlet normal opened contact is 1ZJ2; The another one normal opened contact 1ZJ1 of auxiliary relay 1ZJ and the normally closed contact 2ZJ2 of auxiliary relay 2ZJ connects, realize the function of auxiliary relay 1ZJ locking, in like manner, the generator accident of cross-over connection and 1ZJ1 and 2ZJ2 draws contact SGJ, equally complete and close water inlet butterfly valve and locking, finally reach the safe task that generating set protection system completes protection turbine-generator units; Auxiliary relay 2ZJ opens water inlet electric butterfly valve, and its outlet normal opened contact is 2ZJ4; The normal opened contact 2ZJ3 of auxiliary relay 2ZJ realizes the blocking function of auxiliary relay 2ZJ, completes and opens water inlet butterfly valve and locking; AN1 is manually opened water inlet butterfly valve button, and AN2 manually stops opening water inlet butterfly valve button; AN3 is existing ground manual-lock water inlet butterfly valve button, and AN4 is manually opened water inlet butterfly valve button existingly; DCF is the travel switch of its water inlet butterfly valve.
As can be seen from Figure 3, when transmission system electrical network (comprising utility grid) has an accident, generating set protection circuit starts the emergence program of emergency closure water inlet electric butterfly valve immediately automatically, first through auxiliary contact (MK)-→ generating set synchronizing switch (TQ)-→ auxiliary relay 2ZJ of auxiliary contact (FDL)-→ eliminating magnetism of generator switch of generator outlet circuit breaker normally closed contact (2ZJ1)-→ auxiliary relay 1ZJ and through the auxiliary contact 1ZJ1 locking of auxiliary relay 1ZJ, then closing water inlet electric butterfly valve makes turbine-generator units in a safe condition.
In like manner, when generating set has an accident, its accident draws contact (SGJ) also can start accident emergency program automatically, first draw normally closed contact (2ZJ1)-→ auxiliary relay 1ZJ of contact (SGJ)-→ auxiliary relay 2ZJ through accident and through the auxiliary contact 1ZJ1 locking of auxiliary relay 1ZJ, then close water inlet electric butterfly valve and make turbine-generator units also in a safe condition.
When above-mentioned accident emergency, the electic protection control unit of generating set and the supply power source path of Generator Auxiliary are: " electic protection control unit (9)-→ generating set (10) of direct current batteries (6)-→ inverter (7)-→ the second double power supply automatic transfer switch (8)-→ generating set and Generator Auxiliary (11) ".
This path illustrates, when transmission system electrical network and utility grid have an accident, this system also equally for the electic protection control unit of generating set and Generator Auxiliary provide power supply guarantee, makes it continue to play a role.But the electic protection control unit of generating set just could not provide this guarantee in prior art, be merely able to rely on and manually close water inlet electric butterfly valve, if now just there is turbine gate mechanism fault again, that is just abnormally dangerous.
From Fig. 3 also, when transmission system electrical network (comprising utility grid) has an accident and want to open water inlet electric butterfly valve, only push-button switch AN1 need be pressed, directly start auxiliary relay 2ZJ.But the electic protection control unit of generating set does not just realize in original technology at all, still more in natural calamity and in emergency circumstances, unlatching outlet gate deals with dangerous situation with startup suction pump etc.
Consider and automatically control there is situation about breaking down; this generating set protection circuit has also added " automatically, manually, stopping " diverter switch QK1, manually opened button AN1, manually stop releasing the button AN2 and on-the-spot X button AN3, scene release the button AN4; both automatically can open or closed water inlet electric butterfly valve in a distant place; on-the-spotly can open or close it again, ensureing that unit is safer, reliable.
Certainly, more than just water inlet electric butterfly valve is taken to be example explanation, this system can also be applied to the electronic wicket gates of the hydraulic turbine, oil pressure unit, pneumatic shuttle, brake gear etc., even be applied to the Water logged area of flood control requirement, pond on a hill and reservoir etc., all these difficulty implemented do not have too many problem technically yet, no longer continue to introduce at this yet.Generally speaking, this improvement has distinguishing feature and outstanding effect.
3, Economic and Efficiency Analysis:
Because the electic protection control unit of generating set of the present utility model without station transformer, so if newly-built hydroelectric station or Water logged area, pond on a hill and reservoir, just directly can economize the expense purchasing station transformer; If original station transformer, can it out of service transfer to for subsequent use, reduce transformer loss, save operating cost.
The above, be only preferred embodiment of the present utility model, is not intended to limit protection range of the present utility model.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (3)
1., for an electric power system for the electic protection control unit of generating set, it is characterized in that, comprising:
Transmission system electrical network (1), for providing main transformer power supply;
Utility grid (2), for providing the first service power;
The main transformer (3) be connected with transmission system electrical network (1), for providing the second service power;
The first double power supply automatic transfer switch (4) be connected with main transformer (3) and utility grid (2), double power-supply automatic transferring is performed between the second service power that the first service power of providing at utility grid (2) and main transformer (3) provide, wherein the supply path of the first service power that provides of utility grid (2) is in running order, and the supply path of the second service power that main transformer (3) provides is in hot stand-by duty;
The DC charging device (5) be connected with the first double power supply automatic transfer switch (4), for by the first double power supply automatic transfer switch (4) the alternating current of service power of current conversion change direct current into;
The direct current batteries (6) be connected with DC charging device (5), for laying in direct current;
The inverter (7) be connected with direct current batteries (6), the direct current for direct current batteries (6) being laid in changes industrial-frequency alternating current into serve as the 3rd service power;
The second double power supply automatic transfer switch (8) be connected with inverter (7) and the first double power supply automatic transfer switch (4), for the 3rd service power that provides at inverter (7) and the first double power supply automatic transfer switch (4) current conversion service power between perform double power-supply automatic transferring, wherein the first double power supply automatic transfer switch (4) the supply path of service power of current conversion in running order, and the supply path of the 3rd service power that inverter (7) provides is in hot stand-by duty;
The electic protection control unit (9) of generating set, is connected with the second double power supply automatic transfer switch (8), for the protection of with control generating set (10) or Generator Auxiliary (11);
Generating set (10) or Generator Auxiliary (11), be connected with the electic protection control unit (9) of generating set.
2. the electric power system of the electic protection control unit for generating set according to claim 1; it is characterized in that, described Generator Auxiliary (11) comprises inlet gate, water inlet gate valve, the electronic wicket gates of the hydraulic turbine, oil pressure unit, pneumatic shuttle, brake gear, suction pump and dam hoist.
3. the electric power system of the electic protection control unit for generating set according to claim 1, is characterized in that, described inverter (7) is active inverter or passive inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420532346.1U CN204089336U (en) | 2014-09-17 | 2014-09-17 | A kind of electric power system of the electic protection control unit for generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420532346.1U CN204089336U (en) | 2014-09-17 | 2014-09-17 | A kind of electric power system of the electic protection control unit for generating set |
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| Publication Number | Publication Date |
|---|---|
| CN204089336U true CN204089336U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420532346.1U Expired - Fee Related CN204089336U (en) | 2014-09-17 | 2014-09-17 | A kind of electric power system of the electic protection control unit for generating set |
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| Country | Link |
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| CN (1) | CN204089336U (en) |
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2014
- 2014-09-17 CN CN201420532346.1U patent/CN204089336U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20170917 |
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| CF01 | Termination of patent right due to non-payment of annual fee |