CN217538797U - Real-time diagnosis device for loop fuse of power-on shutdown electromagnetic valve of steam turbine - Google Patents
Real-time diagnosis device for loop fuse of power-on shutdown electromagnetic valve of steam turbine Download PDFInfo
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- CN217538797U CN217538797U CN202220826072.1U CN202220826072U CN217538797U CN 217538797 U CN217538797 U CN 217538797U CN 202220826072 U CN202220826072 U CN 202220826072U CN 217538797 U CN217538797 U CN 217538797U
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 3
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model relates to a steam turbine interlocking protection device. The device has the characteristics of real-time monitoring, correct diagnosis, safety, reliability, convenience in wiring, simplicity in replacement and the like, and particularly can reduce the workload of operators and avoid working negligence. The technical scheme is as follows: a real-time diagnosis device for a loop fuse of a power-on shutdown electromagnetic valve of a steam turbine comprises a shutdown button and a shutdown signal contact which are connected in parallel and then connected in series with the shutdown electromagnetic valve to form a loop, wherein the shutdown signal contact is a DO output contact of a steam turbine interlocking protection system; the method is characterized in that: the device also comprises a fuse monitoring relay connected with the loop in parallel, wherein two parallel ends of the fuse monitoring relay are respectively connected with the positive pole and the negative pole of the power supply one by one through a fuse; and the normally open contact of the fuse monitoring relay is connected with the input contact DI of the steam turbine interlocking protection system and is used for diagnosing the state of the fuse.
Description
Technical Field
The utility model relates to a steam turbine interlocking protection device specifically is a steam turbine protection system gets power and shuts down the real-time diagnosis device of solenoid valve return circuit fuse.
Background
In order to ensure that the unit can reduce misoperation and stably operate for a long time to ensure benefits, the traditional steam turbine interlocking protection system usually adopts an electromagnetic valve which is powered on and shut down, particularly in the field of power generation. In order to avoid power failure caused by faults such as short circuit of the electromagnetic valve in the electromagnetic valve loop, the influence range is expanded, and a fuse terminal is often connected in the electromagnetic valve loop in series. When faults such as short circuit of the electromagnetic valve occur, the fuse can immediately cut off the faults, so that the fault range is only limited in the loop of the electromagnetic valve, the safety and reliability of a power supply are guaranteed, and other control devices are not affected.
The electromagnetic valve of the steam turbine interlocking protection system which is powered on and shut down is in a power-off state when the unit normally operates, and only when the interlocking protection acts, the electromagnetic valve of the shut down is powered on and acts, the quick oil cut-off is discharged, and the main throttle valve of the steam turbine is closed. Because the normal operation time of the steam turbine is often very long, generally several months or even one year, whether the fuse of the shutdown electromagnetic valve loop is normal or not cannot be ensured; if the fuse is in fault or poor contact, when the interlocking protection system acts, the power supply of the shutdown electromagnetic valve loop is lost due to the fault of the fuse, the failure is generated, the main valve cannot be closed, and serious accidents such as turbine runaway and the like can be caused, so that the shutdown electromagnetic valve is extremely dangerous and is absolutely not allowed.
Whether the fuse is normal is diagnosed conventionally, often the operation maintainer is required to measure and examine the fuse terminal one by one regularly, which not only increases the workload of the operation maintainer, but also increases the risk caused by the omission of inspection. The fuse cannot be monitored in real time, and dead zones are brought to safe operation of the unit.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the above-mentioned background art, providing a get electric shutdown solenoid valve loop fuse's real-time diagnosis device, the device should have characteristics such as real-time supervision, correct diagnosis, safe and reliable, wiring convenience, change are simple, especially can reduce operating personnel's work load and evade the carelessness of work.
The technical scheme of the utility model is that:
a real-time diagnosis device for a loop fuse of a power-on shutdown electromagnetic valve of a steam turbine comprises a shutdown button and a shutdown signal contact which are connected in parallel and then connected in series with the shutdown electromagnetic valve to form a loop, wherein the shutdown signal contact is a DO output contact of a steam turbine interlocking protection system; it is characterized in that is characterized in that: the device also comprises a fuse monitoring relay connected with the loop in parallel, wherein two parallel ends of the fuse monitoring relay are respectively connected with the positive pole and the negative pole of the power supply one by one through a fuse; and the normally open contact of the fuse monitoring relay is connected with the input contact DI of the steam turbine interlocking protection system and is used for diagnosing the state of the fuse.
The rated current of the fuse is 1.6 times of the loop current of the electromagnetic valve.
The power supply is a UPS power supply or a power supply subjected to dual-power redundancy switching.
The power of the fuse monitoring relay is 1W, and no power supply load is additionally added.
The voltage of the power supply is 24V.
The utility model has the advantages that:
the utility model discloses improved the wiring principle in traditional unit electricity power-on shutdown solenoid valve return circuit, adopted at the fuse back and connect a fuse monitoring relay, connect the normally open contact of this fuse monitoring relay to the DI input contact of steam turbine interlocking protection system, read the normally open contact state of this fuse monitoring relay in real time and diagnose: if the normally open contact of the fuse monitoring relay is in a disconnected state under the condition that the loop of the power-on shutdown electromagnetic valve is electrified, the fuse is judged to be in a fault state, an alarm is given on an operation interface of the power-on shutdown system of the steam turbine, and operation and maintenance personnel are prompted to replace the fuse before; under the condition that the loop of the power-on shutdown electromagnetic valve is electrified, if the normally open contact of the fuse monitoring relay is in a closed state, the fuse is judged to be in a normal state, and the normal action of the shutdown electromagnetic valve can be ensured; under the condition of power failure, the comprehensive judgment can be carried out by combining a relay of a power supply. The process realizes real-time diagnosis of the fuse and improves the safety and reliability of the unit.
Drawings
Fig. 1 is a wiring schematic diagram of the present invention.
Fig. 2 is a wiring schematic diagram of a conventional power-on shutdown solenoid valve circuit.
Detailed Description
The present invention will be further described with reference to the following embodiments shown in the drawings, but the present invention is not limited to the following embodiments.
In the wiring schematic diagram of the conventional power-on shutdown solenoid valve circuit shown in fig. 2, the shutdown button and the shutdown relay contact are connected in parallel, then the fuse and the shutdown solenoid valve are sequentially connected in series, and then the power supply is switched on to form the circuit. It can be seen that: when the fuse fails, the interlocking protection action conducts the stop signal contact or the stop button action, the stop electromagnetic valve cannot be powered to act, the steam turbine cannot close the main steam valve, accidents such as runaway and the like can be caused, and the accidents are not allowed to occur. However, whether the fuse fails or not is not prejudged before the interlocking protection action or the stop button action, so that a blind area is caused to the safe operation of the unit, and huge risks are brought.
The wiring principle of the utility model is shown in figure 1; it can be seen that: when the fuse trouble, fuse monitoring relay can lose electricity, and fuse monitoring relay's normally open contact will be in the off-state, so can judge in advance whether the fuse is trouble through the normally open contact state that reads fuse monitoring relay to in time change the fuse, ensure to shut down the solenoid valve and can normally move, the safe operation is realized to the protection unit.
The fuse and the relay are replaceable, so that the type selection and the replacement can be performed according to the voltage grade of the electromagnetic valve and the rated current of a loop, and the on-line replacement can be performed when the fuse and the relay have faults. The device has the characteristics of adaptability to various specifications, convenience in replacement and the like.
Finally, it should be noted that the above-mentioned embodiments illustrate only specific embodiments of the invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (3)
1. A real-time diagnosis device for a loop fuse of a power-on shutdown electromagnetic valve of a steam turbine comprises a shutdown button and a shutdown signal contact which are connected in parallel and then connected in series with the shutdown electromagnetic valve to form a loop, wherein the shutdown signal contact is an output DO contact of an interlocking protection system of the steam turbine; the method is characterized in that: the device also comprises a fuse monitoring relay connected with the loop in parallel, wherein two parallel ends of the fuse monitoring relay are respectively connected with the anode and the cathode of a power supply one by one through a fuse; the normally open contact of the fuse monitoring relay is connected with the DI contact of the steam turbine interlocking protection system and used for diagnosing the fuse state;
the rated current of the fuse is 1.6 times of the loop current of the electromagnetic valve;
the power supply is a UPS power supply or a power supply subjected to dual-power redundancy switching.
2. The real-time diagnostic device for the loop fuse of the solenoid valve for the power-on and power-off of the steam turbine according to claim 1, wherein: the power of the fuse monitoring relay is 1W, and the power supply load is not additionally increased.
3. The real-time diagnostic device for the loop fuse of the solenoid valve for the power-on and power-off of the steam turbine according to claim 2, wherein: the voltage of the power supply is 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220826072.1U CN217538797U (en) | 2022-04-11 | 2022-04-11 | Real-time diagnosis device for loop fuse of power-on shutdown electromagnetic valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220826072.1U CN217538797U (en) | 2022-04-11 | 2022-04-11 | Real-time diagnosis device for loop fuse of power-on shutdown electromagnetic valve of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217538797U true CN217538797U (en) | 2022-10-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220826072.1U Expired - Fee Related CN217538797U (en) | 2022-04-11 | 2022-04-11 | Real-time diagnosis device for loop fuse of power-on shutdown electromagnetic valve of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217538797U (en) |
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2022
- 2022-04-11 CN CN202220826072.1U patent/CN217538797U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20221004 |
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| CF01 | Termination of patent right due to non-payment of annual fee |