CN203285496U - Redundant PLC steam turbine protection system - Google Patents
Redundant PLC steam turbine protection system Download PDFInfo
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- CN203285496U CN203285496U CN2013203068420U CN201320306842U CN203285496U CN 203285496 U CN203285496 U CN 203285496U CN 2013203068420 U CN2013203068420 U CN 2013203068420U CN 201320306842 U CN201320306842 U CN 201320306842U CN 203285496 U CN203285496 U CN 203285496U
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Abstract
The utility model relates to a redundant PLC steam turbine protection system, and provides a system that has characteristics of high reliability, convenient use and low cost. The technical scheme is the redundant PLC steam turbine protection system, which is characterized in that the protection system comprises four mutually connected branched in parallel wherein a No.1 branch comprises a self-diagnosis output contact of a first PLC controller, a normally closed contact of a second relay and a coil of a first relay which are connected in sequence; a No.2 branch comprises the self-diagnosis output contact of a second PLC controller, the normally closed contact of the first relay and the coil of the second relay which are connected in sequence; a No.3 branch comprises a stop output contact of the first PLC controller, a normally open contact of the first relay and a first stop electromagnetic valve which are connected in sequence; a No.4 branch comprises the stop output contact of the second PLC controller, the normally open contact of the second relay and a second stop electromagnetic valve which are connected in sequence; and the second stop electromagnetic valve is connected to the first stop electromagnetic valve.
Description
Technical field
The utility model relates to the steam turbine technology field, is specifically related to a kind of redundant PLC Protection System of Turbin.
Background technique
In the industrial steam turbine field,, in order to make the operation of controlling the protective system long time stability, select in a large number programmable logic controller (PLC) PLC as controller,, for the reliability of further raising system, set up on this basis redundant system.Redundancy is exactly by increasing the parts of same function, and by certain logic, makes their synchronous operation in phase, makes the system applies function obtain multiple assurance.Therefore reasonably redundant system will improve the reliability of system greatly, effectively avoid because the very big economic loss that stopping production that local fault causes or device damage cause appears in control system.
As shown in Figure 1, the hard redundant system of main flow, the most reliable on performance at present, but the expensive high-end field of tending to; Single PLC system reliability in Fig. 2 can't meet the requirement of Protection System of Turbin safety class.
The model utility content
The purpose of this utility model is to overcome the deficiency that the above-mentioned background technology exists, and a kind of improvement of redundant PLC Protection System of Turbin is provided, and this system should have high, easy to use, the lower-cost characteristics of reliability.
The utility model proposes following technological scheme:
The redundant PLC Protection System of Turbin is characterized in that: described protective system comprises four branch roads parallel with one another;
No. one branch road comprises the self diagnosis output contact of a PLC controller that sequentially connects, the normally-closed contact of the second relay, the line bag of the first relay;
No. two branch road comprises the self diagnosis output contact of the 2nd PLC controller that sequentially connects, the normally-closed contact of the first relay, the line bag of the second relay;
No. three branch roads comprise shutdown output contact, the normally opened contact of the first relay, the first shutdown solenoid valve of a PLC controller that sequentially connects;
No. four branch roads comprise shutdown output contact, the normally opened contact of the second relay, the second shutdown solenoid valve of the 2nd PLC controller that sequentially connects; Described the second shutdown solenoid valve and first is shut down solenoid valve and is connected.
Node between the normally opened contact of described the first shutdown solenoid valve and described the first relay; with be connected between the second node of shutting down between the normally opened contact of solenoid valve and described the second relay, thereby realize that first shuts down being connected between solenoid valve and the second shutdown solenoid valve.
The beneficial effects of the utility model are: when the PLC configuration of the utility model by redundancy, the signalling channel design of redundancy have guaranteed therein any one PLC system failure, another can take over job at once, guarantees that Turbine Safety shuts down; Switch to realize that by outside the redundancy of two cover PLC is standby, both reached and required also to have reduced cost, with non-redundant system (single PLC) relatively, effectively avoid again causing the mistakenly stop machine maybe to refuse shutdown during this shutdown because local fault appears in control system, system is more stable more reliable; Compare with hard redundant system, price only has 40% of hard redundant system.
Description of drawings
Fig. 1 is the structural representation of existing hard redundancy protection systems.
Fig. 2 is the structural representation of existing single PLC protective system.
Fig. 3 is structural representation of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail, but the utility model is not limited to following examples.
As shown in Figure 3, redundant PLC Protection System of Turbin described in the utility model, comprise four branch roads parallel with one another;
No. one branch road L1 comprises the self diagnosis output contact PLC-A1 of a PLC controller that sequentially connects, the normally-closed contact of the second relay K 2, the line bag of the first relay;
No. two branch road L2 comprises the self diagnosis output contact PLC-B1 of the 2nd PLC controller that sequentially connects, the normally-closed contact of the first relay K 1, the line bag of the second relay;
No. three branch road L3 comprise shutdown output contact PLC-A2, the normally opened contact of the first relay, the first shutdown solenoid valve SOV1 of a PLC controller that sequentially connects;
No. four branch road L4 comprise shutdown output contact PLC-B2, the normally opened contact of the second relay, the second shutdown solenoid valve SOV2 of the 2nd PLC controller that sequentially connects; Described the second shutdown solenoid valve and first is shut down solenoid valve and is connected.
Node between the normally opened contact of described the first shutdown solenoid valve and described the first relay; with be connected between the second node of shutting down between the normally opened contact of solenoid valve and described the second relay, thereby realize that first shuts down being connected between solenoid valve and the second shutdown solenoid valve.
Also have shutdown output contact PLC1, the PLC2 of existing hard redundancy protection systems, the shutdown output contact PLC3 of single PLC protective system in Fig. 3 in Fig. 1.
Working principle of the present utility model is:
This redundant system is comprised of the two relatively independent PLC systems of cover;
When system starts, the operation of successively switching on of the first and second PLC controllers, what first start becomes main website.After the one PLC controller starts, if self check OK, the self diagnosis output contact of a PLC controller is closed, makes the line bag of the first relay in branch road obtain electric excitation, the normally opened contact of the first relay is closed, and the shutdown output contact of a PLC controller is ready for shutting down; The line bag of the first relay obtains the normally closed point of the first relay after electric excitation and disconnects, and making the L2 loop at the self diagnosis output contact place of the 2nd PLC controller is stand-by state.When shutting down generation, the shutdown output contact of a PLC controller is closed, the first shutdown solenoid valve and the second shutdown solenoid valve is obtained electric, halt turbines;
When a PLC controller broke down, the self diagnosis of a PLC controller touched output contact and stays open state, and the line bag of the first relay must not be electric; If the 2nd PLC controller self check OK, the self diagnosis output contact closure of the 2nd PLC controller makes the line bag of the second relay in No. two branch roads obtain electric excitation, the normal battle of the second relay is closed, and the shutdown output contact of the 2nd PLC controller is ready for shutting down; The normally closed point of the second relay disconnects, and making the L1 loop at the self diagnosis output contact place of a PLC controller is stand-by state.This moment, in No. four branch roads, the shutdown output contact of the 2nd PLC controller was closed when shut down occurring, make first shut down solenoid valve and the second shutdown solenoid valve obtain electric, halt turbines.
Claims (2)
1. redundant PLC Protection System of Turbin, it is characterized in that: described protective system comprises four branch roads parallel with one another;
A branch road (L1) comprises the self diagnosis output contact (PLC-A1) of a PLC controller that sequentially connects, the normally-closed contact of the second relay (K2), the line bag of the first relay;
No. two branch roads (L2) comprise the self diagnosis output contact (PLC-B1) of the 2nd PLC controller that sequentially connects, the normally-closed contact of the first relay (K1), the line bag of the second relay;
No. three branch roads (L3) comprise shutdown output contact (PLC-A2), the normally opened contact of the first relay, the first shutdown solenoid valve (SOV1) of a PLC controller that sequentially connects;
No. four branch roads (L4) comprise shutdown output contact (PLC-B2), the normally opened contact of the second relay, the second shutdown solenoid valve (SOV2) of the 2nd PLC controller that sequentially connects; Described the second shutdown solenoid valve and first is shut down solenoid valve and is connected.
2. redundant PLC Protection System of Turbin according to claim 1; it is characterized in that: the node between the normally opened contact of described the first shutdown solenoid valve and described the first relay; with be connected between the second node of shutting down between the normally opened contact of solenoid valve and described the second relay, thereby realize that first shuts down being connected between solenoid valve and the second shutdown solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203068420U CN203285496U (en) | 2013-05-30 | 2013-05-30 | Redundant PLC steam turbine protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203068420U CN203285496U (en) | 2013-05-30 | 2013-05-30 | Redundant PLC steam turbine protection system |
Publications (1)
| Publication Number | Publication Date |
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| CN203285496U true CN203285496U (en) | 2013-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203068420U Expired - Fee Related CN203285496U (en) | 2013-05-30 | 2013-05-30 | Redundant PLC steam turbine protection system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259863A (en) * | 2015-10-30 | 2016-01-20 | 北京航天自动控制研究所 | PLC warm backup redundancy method and system |
| CN107654266A (en) * | 2017-09-25 | 2018-02-02 | 国网山东省电力公司电力科学研究院 | A kind of design method of Protection System of Turbin power supply |
| CN111624938A (en) * | 2020-06-16 | 2020-09-04 | 河北唐银钢铁有限公司 | Redundant output and optimal switching method based on single set of PLC analog output signals |
| CN112727819A (en) * | 2020-12-28 | 2021-04-30 | 浙江汽轮成套技术开发有限公司 | Novel servo redundant control system of steam turbine |
| CN116643481A (en) * | 2023-07-18 | 2023-08-25 | 河南卫华重型机械股份有限公司 | PLC fault switching standby control system for crane |
-
2013
- 2013-05-30 CN CN2013203068420U patent/CN203285496U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259863A (en) * | 2015-10-30 | 2016-01-20 | 北京航天自动控制研究所 | PLC warm backup redundancy method and system |
| CN105259863B (en) * | 2015-10-30 | 2017-11-03 | 北京航天自动控制研究所 | A kind of PLC warm spares redundancy approach and system |
| CN107654266A (en) * | 2017-09-25 | 2018-02-02 | 国网山东省电力公司电力科学研究院 | A kind of design method of Protection System of Turbin power supply |
| CN107654266B (en) * | 2017-09-25 | 2020-04-21 | 国网山东省电力公司电力科学研究院 | Design method of power supply of steam turbine protection system |
| CN111624938A (en) * | 2020-06-16 | 2020-09-04 | 河北唐银钢铁有限公司 | Redundant output and optimal switching method based on single set of PLC analog output signals |
| CN112727819A (en) * | 2020-12-28 | 2021-04-30 | 浙江汽轮成套技术开发有限公司 | Novel servo redundant control system of steam turbine |
| CN112727819B (en) * | 2020-12-28 | 2023-02-03 | 浙江汽轮成套技术开发有限公司 | Servo redundant control system of steam turbine |
| CN116643481A (en) * | 2023-07-18 | 2023-08-25 | 河南卫华重型机械股份有限公司 | PLC fault switching standby control system for crane |
| CN116643481B (en) * | 2023-07-18 | 2024-05-17 | 河南卫华重型机械股份有限公司 | PLC fault switching standby control system for crane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 Termination date: 20150530 |
|
| EXPY | Termination of patent right or utility model |