CN218920057U - Control loop for monitoring load state of high-temperature stack plant - Google Patents
Control loop for monitoring load state of high-temperature stack plant Download PDFInfo
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- CN218920057U CN218920057U CN202221588512.0U CN202221588512U CN218920057U CN 218920057 U CN218920057 U CN 218920057U CN 202221588512 U CN202221588512 U CN 202221588512U CN 218920057 U CN218920057 U CN 218920057U
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Abstract
The present disclosure provides a control loop for monitoring load conditions of a high temperature stack plant, the control loop comprising a contactor and a circuit breaker; the primary main contacts of the circuit breaker and the contactor are sequentially connected in series on a power loop; the contactor is connected in series with a power supply of the secondary circuit; the secondary auxiliary normally open contact of the contactor and the secondary auxiliary normally open contact of the breaker are connected in series in sequence and then are electrically connected with the monitoring equipment. The secondary auxiliary normally open contact of the breaker and the series loop of the secondary auxiliary normally open contact of the contactor are used for replacing the secondary auxiliary normally open contact of the original single contactor, so that the load state under various working conditions can be accurately judged.
Description
Technical Field
The disclosure belongs to the technical field of electrical equipment, and particularly relates to a control loop for monitoring a load state of a high-temperature stack plant.
Background
The load for the high-temperature gas cooled reactor plant generally adopts a mode of connecting a breaker in series with a contactor to provide a power supply for a downstream load, a secondary auxiliary contact (normally open) of the contactor is used as a criterion for monitoring the input of the downstream load, the state is displayed correctly during normal operation, once the downstream fault causes the breaker to trip, the load exits from operation, the contactor is still in a closed state due to a self-holding function, and the secondary auxiliary contact of the contactor is kept closed, so that the downstream load is misjudged to be in an operation state and is inconsistent with the actual situation, and the judgment of operators in a main control room is interfered.
Disclosure of Invention
The present disclosure aims to solve at least one of the technical problems existing in the prior art, and provides a control loop for monitoring load conditions of a high-temperature stack plant.
The present disclosure provides a control loop for monitoring load conditions of a high temperature stack plant, the control loop comprising a contactor and a circuit breaker;
the primary main contacts of the circuit breaker and the contactor are sequentially connected in series on a power loop;
the contactor is connected in series with a power supply of the secondary circuit;
the secondary auxiliary normally open contact of the contactor and the secondary auxiliary normally open contact of the breaker are connected in series in sequence and then are electrically connected with the monitoring equipment.
In some embodiments, the contactor is further connected in series with a secondary auxiliary contact of a thermal relay.
In some embodiments, the control loop further comprises a thermal relay and a fuse;
the main contact of the thermal relay is connected in series on the power loop, and the fuse, the secondary auxiliary normally open contact of the thermal relay and the contactor are connected in series in sequence and then connected into a control power supply.
In some embodiments, the control loop further comprises a closing button and a opening button;
and the closing button, the opening button and the contactor are sequentially connected in series and then connected with a control power supply.
In some embodiments, the monitoring device employs a DCS monitoring device.
In some embodiments, the monitoring device is configured to determine a load state under each working condition according to the secondary auxiliary normally open contact of the contactor and the secondary auxiliary normally open contact of the circuit breaker.
According to the control loop for monitoring the load state of the high-temperature stack plant, the secondary auxiliary normally-open contact of the breaker and the series loop of the secondary auxiliary normally-open contact of the contactor are used for replacing the secondary auxiliary normally-open contact of the original single contactor, so that the load state under various working conditions can be accurately judged.
Drawings
Fig. 1 is a schematic structural diagram of a control loop for monitoring load conditions of a high-temperature stack plant according to an embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and detailed description.
As shown in fig. 1, an embodiment of the present disclosure relates to a control loop for monitoring load conditions of a high temperature stack plant, the control loop including a contactor KM and a circuit breaker QF. The primary main contacts of the breaker QF and the contactor KM are sequentially connected in series on a power circuit. The contactor KM is connected in series to the power supply of the secondary circuit, that is, as shown in fig. 1, a first end of the contactor KM is electrically connected to the live wire L of the control power supply, and a second end of the contactor KM is electrically connected to the neutral wire N of the control power supply. The secondary auxiliary normally open contact of the contactor KM and the secondary auxiliary normally open contact of the breaker QF are sequentially connected in series and then are electrically connected with monitoring equipment (such as monitoring equipment of DCS and the like).
Specifically, when the high-temperature reactor normally operates, the contactor KM is used as a control means, and a secondary auxiliary normally open contact of the contactor KM is used for judging a load state; when a downstream short circuit fault occurs, the breaker QF breaks a fault loop, and a secondary auxiliary normally open contact of the breaker QF is used for judging a load state; and when the overheat fault occurs, the contactor control loop is disconnected, the contactor KM is disconnected, and the load state is judged by using the secondary auxiliary normally open contact of the contactor KM. In summary, the load state can be accurately determined in various cases.
According to the control loop for monitoring the load state of the high-temperature stack plant, the load state of various working conditions can be accurately judged by using the breaker secondary auxiliary normally-open contact and the contactor secondary auxiliary normally-open contact series loop to replace the original single contactor secondary auxiliary normally-open contact.
Illustratively, as shown in fig. 1, the contactor KM is further connected in series with a secondary auxiliary contact of the thermal relay. In this way, when overheat faults occur, the thermal relay opens the control circuit of the contactor KM, and then opens the contactor KM, and the load state is determined by using the secondary auxiliary normally open contact of the contactor KM.
Illustratively, as shown in FIG. 1, the control loop further includes thermal relay BB and fuse FU. The main contact of the thermal relay BB is connected in series on the power loop, the fuse FU, the secondary auxiliary normally closed contact of the thermal relay BB and the contactor KM are connected in series in sequence and then connected into the control power supply, specifically, as shown in figure 1, a first end of the fuse FU is electrically connected with a live wire L of the control power supply, a second end of the fuse FU is electrically connected with the secondary auxiliary normally closed contact of the thermal relay BB, the secondary auxiliary normally closed contact of the thermal relay BB is electrically connected with the first end of the contactor KM, and a second end of the contactor KM is electrically connected with a zero line N of the control power supply.
In the control circuit for monitoring the load state of the high-temperature stack plant according to the embodiment, when the control circuit fails, the fuse breaks the contactor control circuit, and then the contactor is broken, and the load state is judged by using the second auxiliary normally open contact of the contactor.
Illustratively, as shown in fig. 1, the control loop further includes a closing button K1 and an opening button K2. The switching-on button K1, the switching-off button K2 and the contactor KM are connected in series in sequence and then connected into the control power supply, specifically, a first end of the switching-on button K1 is electrically connected with a second end of the fuse FU, a second end of the switching-on button K1 is electrically connected with a first end of the switching-off button K2, and a second end of the switching-off button K2 is electrically connected with a secondary auxiliary normally-closed contact of the thermal relay BB.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.
Claims (5)
1. A control loop for monitoring load state of a high-temperature stack plant, which is characterized by comprising a contactor and a circuit breaker;
the primary main contacts of the circuit breaker and the contactor are sequentially connected in series on a power loop;
the contactor is connected in series with a power supply of the secondary circuit;
the secondary auxiliary normally open contact of the contactor and the secondary auxiliary normally open contact of the breaker are connected in series in sequence and then are electrically connected with the monitoring equipment.
2. The control circuit of claim 1 wherein the contactor is further connected in series with a secondary auxiliary contact of a thermal relay.
3. The control circuit according to claim 1 or 2, characterized in that it further comprises a thermal relay and a fuse;
the main contact of the thermal relay is connected in series on the power loop, and the fuse, the secondary auxiliary normally open contact of the thermal relay and the contactor are connected in series in sequence and then connected into a control power supply.
4. The control circuit according to claim 1 or 2, characterized in that it further comprises a closing button and a opening button;
and the closing button, the opening button and the contactor are sequentially connected in series and then connected with a control power supply.
5. The control loop of claim 1 or 2, wherein the monitoring device is a DCS monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221588512.0U CN218920057U (en) | 2022-06-23 | 2022-06-23 | Control loop for monitoring load state of high-temperature stack plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221588512.0U CN218920057U (en) | 2022-06-23 | 2022-06-23 | Control loop for monitoring load state of high-temperature stack plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218920057U true CN218920057U (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221588512.0U Active CN218920057U (en) | 2022-06-23 | 2022-06-23 | Control loop for monitoring load state of high-temperature stack plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218920057U (en) |
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2022
- 2022-06-23 CN CN202221588512.0U patent/CN218920057U/en active Active
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