CN2739361Y - Steam turbine oil switch dynamic-acting load overspeed safety protecting system - Google Patents
Steam turbine oil switch dynamic-acting load overspeed safety protecting system Download PDFInfo
- Publication number
- CN2739361Y CN2739361Y CN 200420060250 CN200420060250U CN2739361Y CN 2739361 Y CN2739361 Y CN 2739361Y CN 200420060250 CN200420060250 CN 200420060250 CN 200420060250 U CN200420060250 U CN 200420060250U CN 2739361 Y CN2739361 Y CN 2739361Y
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- Prior art keywords
- relay
- oil switch
- load
- branch road
- steam turbine
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Abstract
The utility model discloses a steam turbine oil switch dynamic-acting load overspeed safety protecting system, characterized in that a relay circuit is additionally arranged on the basis of the present digital electro-hydraulic control system (DEH for short) of the steam turbine; an oil switch dynamic-acting load overspeed safety protection function module corresponding to the DEH is connected with the DEH to receive the load judgement signals from the DEH and output controlling signals. Because the relay circuit is composed of relays, the response time of the relay circuit T is less than 40 ms. Compared with the time of 90 ms-140 ms realized by the present DEH oil switch dynamic-acting load overspeed protection system, the time is advanced by 50 ms-100 ms. Thereby, the function of the DEH oil switch dynamic-acting load overspeed safety protection is improved; the rotation flight speed after the oil switch dynamic-acting load is suppressed effectively; the rotation speed overshoot of the machine is reduced at the situation of the machine oil switch dynamic-acting load to keep the secure operation of the machine. The relay circuit has the advantages of structure simple, few components, high reliability and low cost.
Description
Technical field
The utility model belongs to steam turbine control system, specifically, is a kind of safety system that prevents the steam turbine hypervelocity when oil switch action removal of load.
Background technique
When steam turbine set was normally moved, septum valve and reheat control valve were in opening state, and steam enters steam turbine work done generating smoothly.When steam turbine set generation oil switch action removal of load, steam turbine control system sends instruction, closes septum valve and reheat control valve, blocks the steam that enters steam turbine, prevents moment overspeed after the steam turbine removal of load.Through certain hour steam turbine control system excision high pressure, reheat control valve out code, high pressure, reheat control valve are normally controlled again according to the rotating speed control command.
In early days, what steam turbine control system adopted is hydraulic control system, and oil switch actuating signal control hypervelocity restriction closed electromagnetic valve high pressure, reheat control valve 2 seconds prevent moment overspeed after the steam turbine removal of load.Fast development along with computer technology, automatic control technology etc.; the automaticity of steam turbine control improves constantly; digital electro-hydraulic control system (vehicle economy H) has been widely used in each power plant of China; adopt DEH software to realize oil switch action load rejection speed protective function; its response time to oil switch action removal of load signal is about 90ms-140ms, and wherein the DEH software logic operating time is about 50ms-100ms.Along with to the improving constantly of steam turbine operation safety requirement, the response time of 90ms-140ms still dislikes oversize, also has after the steam turbine removal of load overspeed hidden danger of moment.
The model utility content
The technical problems to be solved in the utility model provides a kind of safety system of preventing steam turbine hypervelocity shorter to oil switch action removal of load signal response time, and technical solution is:
A kind of steam turbine oil switch motion load rejection speed safety system comprises digital electro-hydraulic control system, and this system contains steam turbine oil switch motion load rejection speed safety protection function module; Also comprise a relay loop, the corresponding steam turbine oil switch motion of this relay loop load rejection speed safety protection function module is connected with digital electro-hydraulic control system, reception is judged signal from the load of digital electro-hydraulic control system, the output control signal; Described relay loop comprises:
Pair of power source terminals 1,2 connects power supply;
One load is judged signal input branch road, is connected between the described power supply terminal 1,2; This branch road comprises a relay K 2, and its coil is connected with a pair of load judgement signal terminal 3,4;
One oil switch trip signal input branch road is connected between the described power supply terminal 1,2; This branch road comprises a relay K 3, and its coil is connected with a pair of oil switch trip signal terminal 5,6;
The one signal input branch road that is incorporated into the power networks is connected between the described power supply terminal 1,2; This branch road comprises a relay K 4, and its coil is connected with a pair of signal terminal 7,8 that is incorporated into the power networks;
One control signal generation branch road is connected between the described power supply terminal 1,2; This branch road comprises a relay K 1, and its coil judges that with load a pair of normally opened contact K2-1 of signal input branch road relay, a pair of normally opened contact K3-1 of oil switch trip signal input branch road relay, a pair of normally-closed contact K4-1 of the signal that is incorporated into the power networks input branch road relay connect; Its a pair of normally opened contact K1-1 output control signal, the hypervelocity restriction solenoid-driven loop of this control signal input steam turbine height, reheat control valve.
Described relay is multifinger DC load relay, preferably adopts AB or OMRON series relay.
Because relay loop all adopts relay to constitute; single pull up time t＜20ms; the response time that can analyze relay loop is T＜40ms, realizes that with existing DEH software the 90ms-140ms of oil switch action load rejection speed protective system compares, in advance 50ms-100ms.As seen; increase relay loop; improved the oil switch action load rejection speed safety protection function of DEH system; the rotating speed that has more effectively suppressed after the oil switch action removal of load is at full speed; reduce the rotating speed overshoot of unit under the unit oil switch action removal of load situation, guaranteed the safe operation of unit.
In addition, relay loop is simple in structure, element is few, adopts the relay product quality of import AB or OMRON series good, and the reliability height of system, and with low cost, element purchase commodity be 500 yuan of RMB only.
Description of drawings
Fig. 1 is a structural principle block diagram of the present utility model.
Fig. 2-1, Fig. 2 the-the 2nd, the circuit diagram of relay loop among Fig. 1, that is: Fig. 2-the 1st, Fig. 1 oil switch action load rejection speed protection relay loop; Fig. 2-the 2nd, the hypervelocity restriction solenoid-driven loop of Fig. 1 height, reheat control valve.
Code name implication: the A-signal that is incorporated into the power networks among Fig. 1; B-oil switch trip signal; The C-load is judged signal; Other on-site signal of D-; The E-control signal.
Embodiment
Referring to Fig. 1, Fig. 2-1, Fig. 2-2: this steam turbine oil switch motion load rejection speed safety system, comprise digital electro-hydraulic control system (DEH), this system contains steam turbine oil switch motion load rejection speed safety protection function module.The utility model on this basis; set up a relay loop; corresponding steam turbine oil switch motion load rejection speed safety protection function module; (DEH) is connected with digital electro-hydraulic control system; reception is judged signal C from the load of digital electro-hydraulic control system (DEH), output control signal E.This relay loop comprises:
Pair of power source terminals 1,2 connects power supply;
One load is judged signal C input branch road, these route relay K 2 coils formation of connecting with a pair of load judgement signal terminal 3,4;
One oil switch trip signal B imports branch road, these route relay K 3 coils formation of connecting with a pair of oil switch trip signal terminal 5,6;
The one signal A input branch road that is incorporated into the power networks, these route relay K 4 coils formation of connecting with a pair of signal terminal 7,8 that is incorporated into the power networks;
Branch road takes place in one control signal E, and this route relay K 1 coil and load are judged a pair of normally-closed contact K4-1 of a pair of normally opened contact K3-1, the signal that the is incorporated into the power networks input branch road relay of a pair of normally opened contact K2-1, the oil switch trip signal input branch road relay of the signal input branch road relay formation of connecting;
Above-mentioned four branch road parallel connections are connected between the power supply terminal 1,2 jointly.
The a pair of normally opened contact K1-1 output control signal E of relay K 1, the hypervelocity restriction solenoid-driven loop of this control signal input steam turbine height, reheat control valve.
All relays adopt the multiconductor DC load relay of AB or OMRON series.
Judge that from the load of DEH system signal C " load＞X% " isolates input through relay K 2." load " signal can be a generator active power, or governing stage pressure (vapour power), or middle row pressure power.For measuring convenience, accurate, " load " signal is got generator active power usually.
" oil switch tripping operation ", " being incorporated into the power networks " from on-the-spot side are two opposite fully, the produced simultaneously signal B of logic state, A, and they are isolated through relay K 3, K4 respectively expands input.
Normally opened contact K2-1, the K3-1 of relay K 2, K3, the normally-closed contact K4-1 of relay K 4 and relay K 1 constitute hypervelocity high, reheat control valve and limit the electromagnetic valve loop, by the normally opened contact K1-1 output control signal of relay K 1; The normally opened contact K1-1 of relay K 1 is connected to the hypervelocity restriction solenoid-driven loop of height, reheat control valve.
The relay loop working procedure is: when unit normally is incorporated into the power networks load＞X%, and relay K 2 actions.When the oil switch tripping operation and the signal B that is incorporated into the power networks occurring, behind the A, relay K 3, the K4 action, make by relay K 2, the normally opened contact K2-1 of K3, K3-1, the height that the normally-closed contact K4-1 of K4 and K1 constitute, relay K 1 action in the hypervelocity restriction electromagnetic valve loop of reheat control valve, be connected to height, the output contact K1-1 closure of the relay K 1 in the hypervelocity restriction solenoid-driven loop of reheat control valve, response time＜the 40ms of whole relay loop, make septum valve and reheat control valve quick closedown, block the steam that enters steam turbine, prevent moment overspeed after the steam turbine removal of load.Behind load＜X%, relay K 1, K2 reset, and the output contact K1-1 that is connected to the hypervelocity restriction solenoid-driven loop of height, reheat control valve disconnects.So far, the turbine over control function of oil switch action load rejection speed protection relay loop execution is finished.
Claims (2)
1. steam turbine oil switch motion load rejection speed safety system, comprise digital electro-hydraulic control system, this system contains steam turbine oil switch motion load rejection speed safety protection function module, it is characterized in that, also comprise a relay loop, the corresponding steam turbine oil switch motion of this relay loop load rejection speed safety protection function module is connected with digital electro-hydraulic control system, receives from the load of digital electro-hydraulic control system and judges signal, the output control signal; Described relay loop comprises:
Pair of power source terminals (1,2) connects power supply;
One load is judged signal input branch road, is connected between the described power supply terminal (1,2); This branch road comprises a relay K 2, and its coil is connected with a pair of load judgement signal terminal (3,4);
One oil switch trip signal input branch road is connected between the described power supply terminal (1,2); This branch road comprises a relay K 3, and its coil is connected with a pair of oil switch trip signal terminal (5,6);
The one signal input branch road that is incorporated into the power networks is connected between the described power supply terminal (1,2); This branch road comprises a relay K 4, and its coil is connected with a pair of signal terminal that is incorporated into the power networks (7,8);
One control signal generation branch road is connected between the described power supply terminal (1,2); This branch road comprises a relay K 1, and its coil judges that with load a pair of normally opened contact K2-1 of signal input branch road relay, a pair of normally opened contact K3-1 of oil switch trip signal input branch road relay, a pair of normally-closed contact K4-1 of the signal that is incorporated into the power networks input branch road relay connect; Its a pair of normally opened contact K1-1 output control signal, the hypervelocity restriction solenoid-driven loop of this control signal input steam turbine height, reheat control valve.
2. steam turbine oil switch motion load rejection speed safety system according to claim 1 is characterized in that described relay is multifinger DC load relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420060250 CN2739361Y (en) | 2004-07-14 | 2004-07-14 | Steam turbine oil switch dynamic-acting load overspeed safety protecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420060250 CN2739361Y (en) | 2004-07-14 | 2004-07-14 | Steam turbine oil switch dynamic-acting load overspeed safety protecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2739361Y true CN2739361Y (en) | 2005-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420060250 Expired - Lifetime CN2739361Y (en) | 2004-07-14 | 2004-07-14 | Steam turbine oil switch dynamic-acting load overspeed safety protecting system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100474201C (en) * | 2007-01-30 | 2009-04-01 | 北京和利时系统工程有限公司 | Method and device for restricting overspeed of a speed adjustment system |
| CN101170256B (en) * | 2006-10-25 | 2010-05-12 | 宝山钢铁股份有限公司 | Quick switch-back protection method for local power grid power generation unit |
| CN101307699B (en) * | 2007-05-14 | 2010-05-19 | 上海电气电站设备有限公司 | Digital electrichydraulic control system for generating plant turboset |
| CN101435347B (en) * | 2008-12-13 | 2010-08-11 | 东方电气集团东方汽轮机有限公司 | Full fault automatic stop relay protection circuit of steam turbine digital electrohydraulic control system master control modular unit |
| CN102095582A (en) * | 2010-12-01 | 2011-06-15 | 山东电力研究院 | Method for measuring and acquiring accumulative work time with dynamometry load rejection test for steam turbo generator unit |
| CN102536349A (en) * | 2010-12-17 | 2012-07-04 | 阿尔斯通技术有限公司 | Steam turbine overspeed protection method and system |
| CN102877896A (en) * | 2012-10-11 | 2013-01-16 | 沈翀 | Trip protection system of steam turbine in emergency situations |
| CN103075206A (en) * | 2013-01-24 | 2013-05-01 | 广东电网公司电力调度控制中心 | Thermal power unit overspeed protection method based on controlling of safety automatic device |
| CN106958465A (en) * | 2017-04-10 | 2017-07-18 | 贵州电网有限责任公司电力科学研究院 | It is a kind of to be used for the method for fast and stable rotating speed after Turbo-generator Set removal of load |
| CN108547250A (en) * | 2018-03-02 | 2018-09-18 | 中国水利水电科学研究院 | Simulation power station Stoplog gate stratified pumping, which is got rid of, increases load test system and method |
| CN113257444A (en) * | 2021-04-22 | 2021-08-13 | 广东核电合营有限公司 | Method for preventing overspeed tripping in full-flow test of auxiliary water supply steam-driven pump of nuclear power station |
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2004
- 2004-07-14 CN CN 200420060250 patent/CN2739361Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170256B (en) * | 2006-10-25 | 2010-05-12 | 宝山钢铁股份有限公司 | Quick switch-back protection method for local power grid power generation unit |
| CN100474201C (en) * | 2007-01-30 | 2009-04-01 | 北京和利时系统工程有限公司 | Method and device for restricting overspeed of a speed adjustment system |
| CN101307699B (en) * | 2007-05-14 | 2010-05-19 | 上海电气电站设备有限公司 | Digital electrichydraulic control system for generating plant turboset |
| CN101435347B (en) * | 2008-12-13 | 2010-08-11 | 东方电气集团东方汽轮机有限公司 | Full fault automatic stop relay protection circuit of steam turbine digital electrohydraulic control system master control modular unit |
| CN102095582A (en) * | 2010-12-01 | 2011-06-15 | 山东电力研究院 | Method for measuring and acquiring accumulative work time with dynamometry load rejection test for steam turbo generator unit |
| CN102536349A (en) * | 2010-12-17 | 2012-07-04 | 阿尔斯通技术有限公司 | Steam turbine overspeed protection method and system |
| CN102877896A (en) * | 2012-10-11 | 2013-01-16 | 沈翀 | Trip protection system of steam turbine in emergency situations |
| CN102877896B (en) * | 2012-10-11 | 2015-08-19 | 沈翀 | Turbine emergency situation trip protection system |
| CN103075206A (en) * | 2013-01-24 | 2013-05-01 | 广东电网公司电力调度控制中心 | Thermal power unit overspeed protection method based on controlling of safety automatic device |
| CN106958465A (en) * | 2017-04-10 | 2017-07-18 | 贵州电网有限责任公司电力科学研究院 | It is a kind of to be used for the method for fast and stable rotating speed after Turbo-generator Set removal of load |
| CN108547250A (en) * | 2018-03-02 | 2018-09-18 | 中国水利水电科学研究院 | Simulation power station Stoplog gate stratified pumping, which is got rid of, increases load test system and method |
| CN108547250B (en) * | 2018-03-02 | 2023-07-25 | 中国水利水电科学研究院 | Layered water taking, load throwing and increasing experiment system and method for simulating stoplog door of hydropower station |
| CN113257444A (en) * | 2021-04-22 | 2021-08-13 | 广东核电合营有限公司 | Method for preventing overspeed tripping in full-flow test of auxiliary water supply steam-driven pump of nuclear power station |
| CN113257444B (en) * | 2021-04-22 | 2022-09-09 | 广东核电合营有限公司 | Method for preventing overspeed tripping in full-flow test of auxiliary water supply steam-driven pump of nuclear power station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: DONGFANG ELECTRIC GROUP DONGFANG STEAM TURBINE CO. Free format text: FORMER NAME OR ADDRESS: DONGFAN STEAM TURBINE FACTORY |
|
| CP03 | Change of name, title or address |
Address after: 618201 Deyang City, Sichuan Province town of Hanwang Patentee after: Dongfang Turbine Co., Ltd., Dongfang Electric Group Address before: 618201 Deyang City, Sichuan Province town of Hanwang Patentee before: Dongfang Steam Turbine Plant |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140714 Granted publication date: 20051109 |