CN113970385A - Thermal power generating unit auxiliary engine temperature monitoring processing method - Google Patents
Thermal power generating unit auxiliary engine temperature monitoring processing method Download PDFInfo
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- CN113970385A CN113970385A CN202111285232.2A CN202111285232A CN113970385A CN 113970385 A CN113970385 A CN 113970385A CN 202111285232 A CN202111285232 A CN 202111285232A CN 113970385 A CN113970385 A CN 113970385A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a thermal power generating unit auxiliary engine temperature monitoring processing method, which comprises the following steps: step 1, acquiring temperature parameters of an auxiliary machine on line in real time; step 2, when the temperature signal exceeds the upper limit of the range, is lower than the lower limit of the range or is in fault of a control system channel, the control system sends out system fault alarm information; step 3, detecting the temperature change rate of the auxiliary machine; step 4, judging the quality of the temperature measurement external loop according to the temperature change rate of the auxiliary machine; step 5, if the temperature value of the auxiliary machine acquired online in real time is larger than a set value, a temperature out-of-limit alarm signal is sent out; step 6, judging the real-time temperature out-of-limit authenticity by using a temperature rate detection result and a control system fault alarm; the problem of thermal power unit auxiliary engine temperature measurement circuit trouble lack in time, reliable monitoring means, maintainer in time fails to discover and take corresponding processing measure when taking place to measure the trouble, leads to the unit auxiliary engine temperature protection action to influence the unit and exert oneself or unusual shut down is solved.
Description
Technical Field
The invention belongs to the technical field of thermal power generation thermal automation control, and particularly relates to a thermal power generating unit auxiliary engine temperature monitoring processing method.
Background
Important auxiliary engine of thermal power factory all has bearing temperature, motor coil temperature protection, auxiliary engine bearing temperature, motor bearing, motor coil temperature, all provide supervision and protection requirement to the safety and stability operation of auxiliary engine, normal auxiliary engine operation has a stable operating temperature, nevertheless when auxiliary engine bearing in the operation, motor self trouble, the temperature sharply risees the initial stage, in time sends alarm signal, protection action automatic tripping operation auxiliary engine will not cause great damage to equipment.
But the actual situation is the temperature signal processing strategy of the conventional thermal power plant control system; no quality judgment logic is adopted at a measuring point, and the condition of protection misoperation is easy to occur when a measuring loop breaks down; temperature violations caused by, for example, field disturbances, wiring loosening, and measurement element damage; causing the protection logic action to directly trip the auxiliary machine; faults (hardware faults of a control system and field signal circuit faults) of a temperature measurement circuit of an auxiliary machine of the thermal power generating unit lack a timely and reliable monitoring means, and when the measurement faults occur, a maintainer cannot timely find out and take corresponding treatment measures to influence the output of the thermal power generating unit or abnormal shutdown; and the normal operation of the power grid is influenced and the electric quantity is lost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method is used for solving the problems that a fault of a temperature measurement loop of the thermal power unit auxiliary machine lacks a timely and reliable monitoring means, and when the measurement fault occurs, a maintainer cannot timely find and take a corresponding processing measure, so that the unit output power is influenced or the unit is abnormally shut down by a temperature protection action of the thermal power unit auxiliary machine.
The technical scheme of the invention is as follows:
a thermal power generating unit auxiliary engine temperature monitoring processing method comprises the following steps:
step 1, acquiring temperature parameters of an auxiliary machine on line in real time;
step 2, when the temperature signal exceeds the upper limit of the range, is lower than the lower limit of the range or is in fault of a control system channel, the control system sends out system fault alarm information;
step 3, detecting the temperature change rate of the auxiliary machine;
step 4, judging the quality of the temperature measurement external loop according to the temperature change rate of the auxiliary machine;
step 5, if the temperature value of the auxiliary machine acquired online in real time is larger than a set value, a temperature out-of-limit alarm signal is sent out;
and 6, judging the real-time temperature out-of-limit authenticity by using the temperature rate detection result and the control system fault alarm.
The method for acquiring the temperature parameter of the auxiliary engine in real time on line comprises the following steps: acquiring a temperature value of a field temperature sensor in a hard-wired mode; and the temperature value is sent to a thermal power generating unit control system.
The method for detecting the temperature change rate of the auxiliary machine comprises the following steps: the temperature of the auxiliary machine is used as a detected signal, and the rising or falling rate of the temperature signal of the auxiliary machine in the detection period is detected according to a control system clock signal.
Step 4, the method for judging the quality of the temperature measurement external loop according to the temperature change rate of the auxiliary machine comprises the following steps: if the change rate is larger than the set value, the fault of the measurement loop is judged, and a temperature change rate out-of-limit alarm signal is sent out.
And 5, providing the set value by an auxiliary equipment manufacturer.
The method for judging the real-time temperature out-of-limit authenticity by utilizing the temperature rate detection result and the control system fault alarm comprises the following steps: when the temperature change rate is out of limit alarm or the control system is out of order, the temperature out of limit alarm does not trigger the motion protection action; when the temperature change rate is out of limit and no alarm is given and the hardware fault of the control system is not sent out, the temperature out of limit alarm triggers the protection action.
And triggering the protection action to be used as a protection action tripping auxiliary machine.
The invention has the beneficial effects that:
the invention optimizes temperature judgment through the conditions, has more accurate and reliable measurement, and reduces the unit misoperation caused by the measurement loop fault (hardware fault of a control system and field signal loop fault). The technology is low in modification cost, improves the reliability of temperature measurement after modification, and can be applied to temperature protection of an auxiliary machine. By adopting a new processing strategy, the method not only can well protect the safe and stable operation and starting of the auxiliary machine, but also can avoid the influence of unnecessary tripping operation of the auxiliary machine on a power grid and the electric quantity loss caused by the fault of a signal loop.
The problem of thermal power unit auxiliary engine temperature measurement circuit trouble lack in time, reliable monitoring means, maintainer in time fails to discover and take corresponding processing measure when taking place to measure the trouble, leads to the unit auxiliary engine temperature protection action to influence the unit and exert oneself or unusual shut down is solved.
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FIG. 1 is a schematic view of the determination process of the present invention.
Detailed Description
A thermal power generating unit auxiliary engine temperature monitoring processing method comprises the following steps:
step 1, acquiring auxiliary machine temperature parameters in real time on line, and sending field temperature signals to a thermal power generating unit control system in a hard wiring mode.
And 2, when the temperature signal exceeds the upper limit of the range, is lower than the lower limit of the range or has a fault in a channel of the control system, the control system sends out system fault alarm information to inform maintenance personnel to check and process the problems of the control system in time.
And 3, detecting the change rate of the temperature in the rising/falling direction, taking the temperature of the auxiliary machine as a detected signal, and detecting the rising/falling rate of the temperature signal of the auxiliary machine in a detection period according to a clock signal of a control system.
And 4, judging the quality of the temperature measurement external loop according to the temperature change rate of the auxiliary machine, if the change rate is greater than a set value (the set value is an empirical value), judging that the measurement loop has a fault, and sending a temperature change rate out-of-limit alarm signal to inform maintenance personnel to check and process in time.
And 5, acquiring the temperature of the auxiliary machine which is larger than a set value (provided by an auxiliary machine equipment manufacturer) in real time on line, and sending a temperature out-of-limit alarm signal.
Step 6, judging the real-time temperature out-of-limit authenticity by utilizing a temperature rate detection result and a control system fault alarm, and when the temperature change rate is high or the control system fault is sent out, the temperature out-of-limit alarm does not trigger a dynamic protection action; when the alarm with high temperature change rate and the hardware fault of the control system are not sent out, the temperature out-of-limit alarm triggers the protection action.
Claims (7)
1. A thermal power generating unit auxiliary engine temperature monitoring processing method comprises the following steps:
step 1, acquiring temperature parameters of an auxiliary machine on line in real time;
step 2, when the temperature signal exceeds the upper limit of the range, is lower than the lower limit of the range or is in fault of a control system channel, the control system sends out system fault alarm information;
step 3, detecting the temperature change rate of the auxiliary machine;
step 4, judging the quality of the temperature measurement external loop according to the temperature change rate of the auxiliary machine;
step 5, if the temperature value of the auxiliary machine acquired online in real time is larger than a set value, a temperature out-of-limit alarm signal is sent out;
and 6, judging the real-time temperature out-of-limit authenticity by using the temperature rate detection result and the control system fault alarm.
2. The thermal power generating unit auxiliary engine temperature monitoring processing method according to claim 1, characterized in that: the method for acquiring the temperature parameter of the auxiliary engine in real time on line comprises the following steps: acquiring a temperature value of a field temperature sensor in a hard-wired mode; and the temperature value is sent to a thermal power generating unit control system.
3. The thermal power generating unit auxiliary engine temperature monitoring processing method according to claim 1, characterized in that: the method for detecting the temperature change rate of the auxiliary machine comprises the following steps: the temperature of the auxiliary machine is used as a detected signal, and the rising or falling rate of the temperature signal of the auxiliary machine in the detection period is detected according to a control system clock signal.
4. The thermal power generating unit auxiliary engine temperature monitoring processing method according to claim 1, characterized in that: step 4, the method for judging the quality of the temperature measurement external loop according to the temperature change rate of the auxiliary machine comprises the following steps: if the change rate is larger than the set value, the fault of the measurement loop is judged, and a temperature change rate out-of-limit alarm signal is sent out.
5. The thermal power generating unit auxiliary engine temperature monitoring processing method according to claim 1, characterized in that: and 5, providing the set value by an auxiliary equipment manufacturer.
6. The thermal power generating unit auxiliary engine temperature monitoring processing method according to claim 1, characterized in that: the method for judging the real-time temperature out-of-limit authenticity by utilizing the temperature rate detection result and the control system fault alarm comprises the following steps: when the temperature change rate is out of limit alarm or the control system is out of order, the temperature out of limit alarm does not trigger the motion protection action; when the temperature change rate is out of limit and no alarm is given and the hardware fault of the control system is not sent out, the temperature out of limit alarm triggers the protection action.
7. The thermal power generating unit auxiliary engine temperature monitoring processing method according to claim 6, characterized in that: and triggering the protection action to be used as a protection action tripping auxiliary machine.
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| CN202111285232.2A CN113970385A (en) | 2021-11-01 | 2021-11-01 | Thermal power generating unit auxiliary engine temperature monitoring processing method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203224730U (en) * | 2013-04-09 | 2013-10-02 | 国家电网公司 | Temperature measurement signal saltation processing system for thermal power generating unit |
| CN207689028U (en) * | 2017-11-29 | 2018-08-03 | 陕西华电蒲城发电有限责任公司 | A kind of fired power generating unit bearing temperature real-time monitoring system |
| CN109932649A (en) * | 2019-03-07 | 2019-06-25 | 国网浙江省电力有限公司电力科学研究院 | A kind of fired power generating unit generating efficiency monitoring method |
| CN211576381U (en) * | 2019-07-29 | 2020-09-25 | 阜阳华润电力有限公司 | Temperature monitoring system |
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- 2021-11-01 CN CN202111285232.2A patent/CN113970385A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203224730U (en) * | 2013-04-09 | 2013-10-02 | 国家电网公司 | Temperature measurement signal saltation processing system for thermal power generating unit |
| CN207689028U (en) * | 2017-11-29 | 2018-08-03 | 陕西华电蒲城发电有限责任公司 | A kind of fired power generating unit bearing temperature real-time monitoring system |
| CN109932649A (en) * | 2019-03-07 | 2019-06-25 | 国网浙江省电力有限公司电力科学研究院 | A kind of fired power generating unit generating efficiency monitoring method |
| CN211576381U (en) * | 2019-07-29 | 2020-09-25 | 阜阳华润电力有限公司 | Temperature monitoring system |
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