CN214151440U - Device for controlling signal switching of rectifying device - Google Patents
Device for controlling signal switching of rectifying device Download PDFInfo
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- CN214151440U CN214151440U CN202120027723.6U CN202120027723U CN214151440U CN 214151440 U CN214151440 U CN 214151440U CN 202120027723 U CN202120027723 U CN 202120027723U CN 214151440 U CN214151440 U CN 214151440U
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Abstract
The utility model provides a device that fairing control signal switches over, including mainly using sensor, spare sensor, digital signal detection circuitry and auto-change over device, mainly using sensor and spare sensor install respectively on the positive, negative copper bar of electrolysis trough generating line, digital signal detection circuitry receives from the passive point output signal of fairing control system operation relay, digital signal detection circuitry connects auto-change over device. The device ensures the continuous accuracy of the direct current feedback input signal of the rectifying device, ensures the successful switching of the main sensor and the standby sensor of the rectifying system, avoids the false operation of signal jitter of the operating relay and ensures the safety and stability of production.
Description
Technical Field
The present disclosure belongs to the technical field of power system control, and particularly relates to a device for controlling signal switching of a rectifying device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The chlor-alkali enterprises use the ion membrane method caustic soda production process, and one rectifier cabinet provides direct current electric energy for one electrolytic cell. A direct current sensor is respectively arranged on a positive copper bar and a negative copper bar which are respectively arranged at one inlet and one outlet of the bus side of each electrolytic cell for direct current measurement, after the measured values are converted, respective control boxes respectively output a 0-5V voltage signal to be transmitted to a rectification control cabinet digital controller, one voltage signal is used as a main feedback, the other voltage signal is used as a standby feedback and is used for closed-loop regulation of a rectification control system, the rectification control system outputs a 4-20mA signal to be transmitted to a process DCS for cascade regulation, and meanwhile, an operation relay of a rectification device outputs a passive point signal to be used as an electrolytic cell linkage.
In actual operation, when a problem occurs in a main feedback signal, standby feedback serving as hot standby cannot be switched in a digital controller of a rectification control cabinet, the stability of a rectification control system is seriously influenced, and even chain parking accidents are caused. Through communicating with a rectifier manufacturer, the rectifier digital controller is known to have no feedback switching function, and if the digital controller can be switched to standby feedback, a rectifier system still operates stably, but the operation signal of the DCS sometimes shakes, so that the pulse interlock signal of the DCS malfunctions.
In actual operation, the faults of poor contact of an auxiliary contact of an operating relay of the rectifying device, loosening of a terminal strip connection wire, aging and skin breaking of a control cable or long-term vibration friction and the like are also found to possibly cause shaking and mistaken pulse signal sending of an operating signal. Currently, there is no effective way to monitor and lock-up for a fault in the operational relay of the rectifier device.
Therefore, it is necessary to achieve successful switching of the primary and standby direct current feedback and fault tolerance treatment on the jitter fault state of the operating relay of the rectifying device under the condition of ensuring that the output signal of the operating relay of the rectifying device is not jittered, which is a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present disclosure provides a device for switching control signals of a rectifying device, which can automatically determine whether outputs of a main sensor and a standby sensor are normal and output an accurate signal when one of the main sensor and the standby sensor fails, and can perform fault-tolerant processing on a jitter fault state of an operating relay of the rectifying device, thereby ensuring reliable operation of the device.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a device for rectifying device control signal switching, comprising:
the device comprises a main sensor, a standby sensor, a digital signal detection circuit and a switching device, wherein the main sensor and the standby sensor are respectively arranged on a positive copper bar and a negative copper bar of an electrolytic cell bus, the digital signal detection circuit receives a passive point output signal of a running relay of a rectifying device control system, and the digital signal detection circuit is connected with the switching device.
Further, the switching device comprises a CPU module, and the output end of the digital signal detection circuit is connected with the CPU module.
Further, the switching module further comprises a digital quantity output module, and the digital quantity output module is connected with the DCS operation input end.
Furthermore, the switching device also comprises a first analog-to-digital conversion module, a second analog-to-digital conversion module and a switch module.
Further, the control signal output end of the main sensor is connected with the first analog-to-digital conversion module.
Further, the first analog-to-digital conversion module is connected with a CPU module of the switching device.
Furthermore, a control signal output end of the standby sensor is connected with the second analog-to-digital conversion module.
Furthermore, the digital quantity output end of the CPU module is connected with the operation signal input end of the DCS chamber.
Further, the control signal output end of the main sensor and the control signal output end of the standby sensor are respectively connected with two input ends of the change-over switch module.
Further, the output end of the change-over switch module is connected with the input end for controlling the rectifying device.
Furthermore, the CPU module is also connected with a display module and a power supply module. The beneficial effects of this disclosure are:
the device for controlling signal switching of the rectifying device ensures the continuity and accuracy of direct current feedback input signals of the rectifying device, ensures the successful switching of the main sensor and the standby sensor of the rectifying system, avoids the false operation of signal jitter of the operating relay and ensures the safety and stability of production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a device for controlling signal switching of a rectifying device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of external connections of a device for switching control signals of a rectifying device according to an embodiment of the present disclosure;
wherein, 1, a main sensor; 2. a backup sensor; 3. a digital quantity detection circuit; 4. a first analog-to-digital conversion module; 5. a second analog-to-digital conversion module; 6. a digital quantity output module; 7. a CPU module; 8. a display module; 9. a power supply module: 10. a rectifying device input 1; 11. a switching device; 11-1, a main input port; 11-2, a spare input port; 11-3, a digital quantity detection line input port; 11-4, an output port of the rectifying device; 11-5, a power port; 11-6 and a digital quantity output module.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
As shown in fig. 1, the device for controlling signal switching of a rectifying device of this embodiment includes a main sensor, a standby sensor, a digital signal detection circuit and a switching device, where the main sensor and the standby sensor are respectively installed on a positive copper bar and a negative copper bar of an electrolytic cell bus, the digital signal detection circuit receives a passive point output signal from a running relay of a rectifying device control system, and the digital signal detection circuit is connected to the switching device.
As an example of the manner in which the device may be used,
as shown in fig. 1, a switching device for a control signal of a rectifier cabinet comprises a main sensor 1, a standby sensor 2, a digital signal detection circuit 3 and a switching device 11, wherein the main sensor 1 and the standby sensor 2 are respectively installed on a positive bus copper bar and a negative bus copper bar of an electrolytic cell, a signal of the digital signal detection circuit 3 is taken from a passive point output signal of an operation relay of a rectifier control system, the switching device comprises a first analog-to-digital conversion module 4, a second analog-to-digital conversion module 5, a digital quantity output module 6, a display module 8 and a switch module 10, and a CPU module 7 is respectively connected with the display module 8 and a power supply module 9 through circuits.
A control signal output end 1-1 of the main sensor 1 outputs a 0-5V signal which is connected with a first analog-to-digital conversion module 4 through a line, and the first analog-to-digital conversion module 4 is connected with a CPU module 7 through a line; a control signal output end 2-1 of the standby sensor 2 outputs a 0-5V signal which is connected with a second analog-to-digital conversion module 5 through a circuit, and an output end 3-1 of the digital signal detection circuit 3 outputs a signal which is connected with a CPU module 7 through a circuit; a control signal output end 1-1 of the main sensor 1 and a control signal output end 2-1 of the standby sensor 2 are respectively connected with two input ends of a selector switch module 7-1, and an output end of the selector switch 7-1 is connected with an input port 10 for controlling a rectifying device; and the digital quantity output module 6 is connected with the DCS operation input end through a line.
As an example of the manner in which the device may be used,
referring to fig. 2, fig. 2 is a schematic external wiring diagram of the present embodiment, in which an output terminal 1-1 of the active sensor 1 is connected to an active sensor input port 11-1 of the switching device 11. The control signal output terminal 2-1 of the standby sensor 2 is connected to the standby input port 11-2 of the switching device 11. The signal output terminal 3-1 of the digital signal detection line 3 is connected to the input port 11-3 of the switching device 11. The power port 11-5 of the switching device 11 is connected with the power module 9. The signal output port 11-4 of the switching device 11 is connected to the rectifier control input 10. And a digital signal output port 11-6 port of the switching device 11 is connected with a DCS operation signal input end.
In the embodiment, one main sensor is arranged on the positive copper bar on the direct current side, and a 0-5V signal is output; and (3) mounting one standby sensor at the negative copper bar position on the direct current side, outputting a 0-5V signal, and determining whether the signals output by the main sensor and the standby sensor are correct or not after calculation and comparison. After power-on, the default main sensor 1 is connected to an output circuit, and a feedback signal of the main sensor 1 is used for a control signal of a rectification system. When the main sensor 1 has a problem, the main sensor is instantly switched to the standby sensor 2 after comparison, and a feedback signal of the standby sensor 2 is used for a control signal of a rectification system. If the standby sensor 2 is used now, after the main sensor 1 recovers to normal and lasts for 10 seconds, the signal of the main sensor 1 is connected to the output line. The panel of the switching device simultaneously displays the numerical values of the main signal and the standby signal. The main value and the standby value are compared in the operation of the control signal switching device of the rectifying device, and if the main value and the standby value are inconsistent (the mutual error is more than 5%), a two-out-of-two mode is adopted to determine whether the main sensor is normal or not. If it is confirmed that the main sensor 1 is not normal, the signal of the spare sensor 2 is connected to the output line. When the signal of the digital signal detection circuit 3 of the switching device has potential change, the signal is output to the digital quantity output module 6 after being delayed by 1S.
As an example of the manner in which the device may be used,
the switching manner of the CPU module 7 is as follows:
(1) when the main sensor 1 is consistent with the standby sensor 2, the main sensor 1 is selected; if the standby sensor 2 is currently used for access, switching to the main sensor 1 after the consistent condition lasts for 10 seconds;
(2) when the main sensor 1 is inconsistent with the standby sensor 2 and the value of the standby sensor 2 is greater than that of the main sensor 1, switching to the standby sensor 2 immediately; otherwise, switching the standby sensor 1;
(3) when the potential of the digital quantity detection circuit 3 changes, the digital quantity detection circuit delays 1S and outputs the delayed time to the digital quantity output module 6;
(4) when the device is powered off, the main sensor 1 is connected by default.
The above-mentioned immediate switching time is about 100 ms; the agreement condition is that the absolute value of the mutual error of the two measured values is less than 5%. The CPU module 7 selects correct output in the main sensor 1 and the standby sensor 2 by adopting a two-out-of-two mode, and outputs a 0-5V signal to the input 10 for controlling the rectifying device.
In the embodiment, when one of the main sensor and the standby sensor is abnormal, a correct sensor signal is determined and output to a circuit in a two-step amplification mode, the switching time in the process is 100ms, and the input signal of the rectification control system can be switched instantaneously; and during the switching period, the input signal of the operation signal detection circuit is delayed by 1S and then output, and the output signal of the operation relay is subjected to fault-tolerant processing, so that the stable operation signal of the rectifying device is output to the DCS. The correct sensor signal is determined and output to the circuit, and the operating personnel can accurately master the operating conditions of the main sensor and the standby sensor through the measured values of the main sensor and the standby sensor which are simultaneously displayed on the panel of the switching box, thereby reducing the parking accident that the main sensor fails to be switched to the standby sensor to feed back the signal after the fault occurs.
By delaying for 1S after the potential of the digital signal detection circuit is changed, the false operation caused by faults such as shaking of contacts of an operating relay, loosening of wiring of a terminal strip, aging and skin breaking of a control cable or long-term vibration and friction is avoided.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A device for controlling signal switching of a rectifying device is characterized by comprising a main sensor, a standby sensor, a digital signal detection circuit and a switching device, wherein the main sensor and the standby sensor are respectively arranged on a positive copper bar and a negative copper bar of an electrolytic cell bus, the digital signal detection circuit receives a passive point output signal of a running relay of a rectifying device control system, and the digital signal detection circuit is connected with the switching device.
2. The device for controlling signal switching of a rectifying device according to claim 1, wherein said switching means comprises a CPU module, and said digital signal detection line output terminal is connected to said CPU module.
3. The device for switching control signals of a rectifying device according to claim 2, wherein said switching device further comprises a digital output module, said digital output module being connected to said DCS operation input.
4. The device for switching control signals of a rectifying device according to claim 3, wherein said switching device further comprises a first analog-to-digital conversion module, a second analog-to-digital conversion module and a switch module.
5. The device for switching the control signal of the rectifying device according to claim 4, wherein the control signal output terminal of the active sensor is connected to the first analog-to-digital conversion module.
6. The device for switching the control signal of a rectifying device according to claim 4, wherein the first analog-to-digital conversion module is connected with a CPU module of the switching device.
7. The device for switching control signals of a rectifying device according to claim 4, wherein the control signal output terminal of the standby sensor is connected with the second analog-to-digital conversion module.
8. The device for controlling signal switching of a rectifying device according to claim 6, wherein the digital output terminal of the CPU module is connected to the operation signal input terminal of the DCS chamber.
9. The apparatus as claimed in claim 4, wherein the control signal output terminal of the active sensor and the control signal output terminal of the standby sensor are respectively connected to two input terminals of the switch module.
10. The device for switching control signals of a rectifying device according to claim 9, wherein the output terminal of said switching module is connected to the input terminal for controlling the rectifying device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120027723.6U CN214151440U (en) | 2021-01-06 | 2021-01-06 | Device for controlling signal switching of rectifying device |
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| CN202120027723.6U CN214151440U (en) | 2021-01-06 | 2021-01-06 | Device for controlling signal switching of rectifying device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216211A (en) * | 2021-12-16 | 2022-03-22 | 珠海格力电器股份有限公司 | Filter screen filth blockage detection assembly of fresh air conditioner, fresh air conditioner and control method of fresh air conditioner |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216211A (en) * | 2021-12-16 | 2022-03-22 | 珠海格力电器股份有限公司 | Filter screen filth blockage detection assembly of fresh air conditioner, fresh air conditioner and control method of fresh air conditioner |
| CN114216211B (en) * | 2021-12-16 | 2022-09-23 | 珠海格力电器股份有限公司 | Filter screen filth blockage detection assembly of fresh air conditioner, fresh air conditioner and control method of fresh air conditioner |
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