CN219554844U

CN219554844U - Control circuit for safely stopping DCS anti-interference electricity program

Info

Publication number: CN219554844U
Application number: CN202320253506.8U
Authority: CN
Inventors: 徐亮; 杨海霄; 常生睿; 马力明; 杨海生; 张树云
Original assignee: Ningxia Baofeng Energy Group Co ltd
Current assignee: Ningxia Baofeng Energy Group Co ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-08-18
Anticipated expiration: 2033-02-20

Abstract

The utility model provides a control circuit for safely stopping a DCS anti-interference program, which comprises the following components: a main control loop comprising: DCS stops relay KA1, stop button SB 1's first contact, main contactor KM's coil and main contactor KM's contact; a manual control circuit comprising: a first connection point a of the change-over switch SA, a second connection point b of the change-over switch SA and a start button SB2; an automatic control loop, comprising: a third connection point c of the change-over switch SA, a fourth connection point d of the change-over switch SA and a DCS start relay KA2; a shutdown feedback loop, comprising: a second contact of the stop button SB1 and a DCS feedback relay KA3. Through the shutdown feedback loop, the on-site operator can use the stop button SB1 to normally shutdown, and the stop button SB1 is not required to be pressed for a long time to shutdown, so that the potential safety hazard of self-starting of the motor after the button is released is avoided.

Description

Control circuit for safely stopping DCS anti-interference electricity program

Technical Field

The utility model relates to the technical field of anti-interference electricity, in particular to a control circuit for safely stopping a DCS anti-interference electricity program.

Background

The electricity interference refers to the phenomenon that the voltage of the power grid fluctuates greatly in a short time and even is powered off in a short time due to lightning strike, short circuit, power plant fault and other external and internal reasons.

When the power grid is in interference electricity, the voltage is lower than 60%, and the duration exceeds 20-30 ms, the coil of the alternating-current contactor of the motor loop is in loss of electricity, so that the motor is stopped; when the electric interference is over, the motor cannot automatically resume operation, thereby affecting the stable operation of some important equipment or not providing protection for some important equipment. The anti-interference function in the related art can be realized through a DCS anti-interference program.

However, when the DCS anti-glare program is used, the on-site operation stop button needs to be kept for a while after being pressed, the stop button needs to be pressed for a longer time than the DCS anti-glare hold time, so that the motor can be stopped, and if the pressing time is controlled improperly, the motor can be started again after the stop button is released, so that the safety hazard exists.

Disclosure of Invention

The utility model provides a control circuit for safely stopping a DCS anti-interference program, which aims to solve the problem that if the time control is not proper, a stop button is released and then a motor is started again.

The utility model provides a control circuit for safely stopping a DCS anti-interference program, which comprises the following components: a main control loop, the main control loop comprising: the DCS stop relay, the first contact of the stop button, the coil of the main contactor and the contact of the main contactor are sequentially connected in series; two ends of the main control loop are respectively connected with the phase line and the zero line; a manual control circuit, the manual control circuit comprising: the switching device comprises a first connecting point of a change-over switch, a second connecting point of the change-over switch and a starting button, wherein the starting button is connected in series with the first connecting point of the change-over switch and the second connecting point of the change-over switch; the manual control loop is connected in parallel with the two ends of the contact of the main contactor; an automatic control loop, the automatic control loop comprising: the DCS starting relay is connected with the third connection point of the conversion switch and the fourth connection point of the conversion switch in series; the automatic control loop is connected in parallel with the two ends of the contact of the main contactor; the change-over switch is configured to be communicated between a first connection point and a second connection point of the change-over switch when the change-over switch is switched to the manual control loop, and to be disconnected between a third connection point and a fourth connection point of the change-over switch when the change-over switch is switched to the automatic control loop, and to be communicated between the first connection point and the second connection point of the change-over switch; a shutdown feedback loop, the shutdown feedback loop comprising: a second contact of the stop button and a DCS feedback relay are connected in series; the two ends of the shutdown feedback loop are respectively connected with the phase line and the zero line; the DCS feedback relay is configured to send a stop signal to the DCS system when the DCS feedback relay is powered on, and send a stop instruction when the DCS system receives the stop signal.

Optionally, the control circuit for safely stopping the DCS anti-interference program further includes: and the fuse is connected in series on the phase line.

Optionally, the control circuit for safely stopping the DCS anti-interference program further includes: and the motor protector is connected in series on the main control loop.

Optionally, the DCS stop relay is configured to be in a normally closed state, and is turned into an open state when receiving a stop command sent by the DCS system.

Optionally, the first contact of the stop button is configured to be normally closed, and to be turned off when the button is pressed.

Optionally, the second contact of the stop button is configured to be normally open, and to be closed when the button is pressed.

Optionally, the start button is configured to be in a normally open state, and to be in a closed state when the button is pressed.

Optionally, the DCS start relay is configured to be in a normally open state, and is turned into a closed state when receiving a start command sent by the DCS system.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides a control circuit for safely stopping a DCS anti-interference program, which comprises the following components: a main control loop comprising: the DCS stops the relay, stops the first contact of the button, coil and contact of the main contactor; a manual control circuit comprising: a first connection point a of the transfer switch, a second connection point b of the transfer switch and a start button; an automatic control loop, comprising: a third connection point c of the conversion switch, a fourth connection point d of the conversion switch and a DCS starting relay; a shutdown feedback loop, comprising: a second contact of the stop button and a DCS feedback relay. Through the shutdown feedback loop, the on-site operator can use the stop button to normally shutdown, and the stop button is not required to be pressed for a long time to shutdown, so that the potential safety hazard of self-starting of the motor after the button is released is avoided.

Drawings

In order to more clearly illustrate the technical solution of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic circuit diagram of a control circuit for safely stopping a DCS anti-glare program according to the present utility model.

Illustration of:

the system comprises an FU-fuse, a KA1-DCS stop relay, an SB 1-stop button, an SA-change-over switch, a KM-main contactor, an SB 2-start button, a KH-motor protector, a KA2-DCS start relay and a KA3-DCS feedback relay.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the utility model. Merely as an example of a system consistent with some aspects of the utility model as detailed in the claims.

The DCS (distributed control system) is a new generation instrument control system based on a microprocessor, adopts a design principle of distributed control functions, centralized display operation and both distributed autonomy and comprehensive coordination, adopts a basic design idea of centralized control, operation and management, adopts a structural form of multilayer grading and cooperative autonomy, and is mainly characterized by centralized management and decentralized control. DCS has been used in a wide variety of industries including electric power, metallurgy, and petrochemical industries.

The utility model provides a control circuit for safely stopping a DCS anti-interference program, as shown in figure 1, comprising:

a main control loop, the main control loop comprising: the DCS stopping relay KA1, the first contact of the stopping button SB1, the coil of the main contactor KM and the contact of the main contactor KM are sequentially connected in series; and two ends of the main control loop are respectively connected with the phase line L and the zero line N.

The phase line L and the zero line N form a loop and are used for supplying power to electric equipment; the main contactor KM is used for controlling the motor to work, when a coil of the main contactor KM is powered on, the motor starts to run, and a contact point and a second contact point of the main contactor KM are closed; when the coil of the main contactor KM is de-energized, the motor stops and the contacts of the main contactor KM and the second contacts are opened.

In an exemplary embodiment, the DCS stop relay KA1 is configured to be normally closed, and is turned to be turned off when receiving a stop command transmitted from the DCS system. The DCS stop relay KA1 is connected in series in the main control loop and is controlled by the DCS system, and is in a normally closed state during normal operation, so that the main control loop can be connected, and the coil of the main contactor KM can be powered on; when the work is required to be stopped, the DCS system can send a stop instruction to enable the DCS stop relay KA1 to be in an off state, so that the main control loop is disconnected, and the coil of the main contactor KM is powered off.

In an exemplary embodiment, the first contact of the stop button SB1 is configured to be normally closed, and to be turned off when the button is pressed. The first contact of the stop button SB1 is connected in series in the main control loop for manual control, and is in a normally closed state during normal operation, so that the main control loop can be connected, and the coil of the main contactor KM can be powered on; when the operation is required to be stopped, the button can be manually pressed to enable the first contact of the stop button SB1 to be in an off state, so that the main control loop is disconnected, and the coil of the main contactor KM is powered off.

A manual control circuit, the manual control circuit comprising: a first connection point a of the change-over switch SA, a second connection point b of the change-over switch SA and a start button SB2, wherein the start button SB2 is connected in series with the first connection point a of the change-over switch SA and the second connection point b of the change-over switch SA; the manual control loop is connected in parallel with the two ends of the contact of the main contactor KM.

An automatic control loop, the automatic control loop comprising: the third connection point c of the change-over switch SA, the fourth connection point d of the change-over switch SA and the DCS starting relay KA2 are connected in series with the third connection point c of the change-over switch SA and the fourth connection point d of the change-over switch SA; the automatic control loop is connected in parallel with the two ends of the contact of the main contactor KM.

The change-over switch SA is configured to be communicated between a first connection point a and a second connection point b of the change-over switch SA when the change-over switch SA is switched to the manual control loop, and to be disconnected between a third connection point c and a fourth connection point d of the change-over switch SA when the change-over switch SA is switched to the automatic control loop, and to be disconnected between the first connection point a and the second connection point b of the change-over switch SA and to be communicated between the third connection point c and the fourth connection point d of the change-over switch SA.

The manual control loop is used for manually controlling the motor to work, so that the maintenance and the test can be conveniently carried out; the automatic control loop is used for controlling the motor to work by the DCS system, and the DCS system is adopted for controlling the motor to work normally. The change-over switch SA is used for switching the manual control loop and the automatic control loop to work.

In an exemplary embodiment, the start button SB2 is configured to be normally open, and to be closed when the button is pressed. When switching to the manual control loop, the starting button SB2 is pressed, the starting button SB2 is turned to be in a closed state, the manual control loop is turned on, the coil of the main contactor KM is electrified, the contact of the main contactor KM is closed and self-maintained, and the main control loop is kept on, and the motor starts to run at the moment.

In an exemplary embodiment, the DCS start relay KA2 is configured to be normally open and to be closed when a start command sent from the DCS system is received. When switching to the automatic control loop, the DCS system sends a starting instruction, the DCS starting relay KA2 is turned into a closed state, the automatic control loop is connected, the coil of the main contactor KM is electrified, the contact of the main contactor KM is closed and self-maintained, and the main control loop is kept on, so that the motor starts to run.

The DCS anti-interference program is that when interference electricity occurs, an automatic control loop loses electricity and triggers a DCS system to send out a starting instruction; when the electricity interference is finished, the automatic control loop is electrified again, and at the moment, the DCS starting relay KA2 is kept in a closed state by the starting instruction, so that the coil of the main contactor KM is electrified again, the contact of the main contactor KM is closed and self-maintained, and the motor can continue to run. However, if the stop button SB1 is pressed, the automatic control circuit is also powered off, and at this time, the DCS anti-glare program is triggered by mistake, and if the time for pressing the stop button SB1 is improperly controlled, the motor is restarted after the button is released, and there is a safety hazard. Therefore, a shutdown feedback loop is designed to prevent false triggering of the DCS anti-glare program.

A shutdown feedback loop, the shutdown feedback loop comprising: a second contact of the stop button SB1 and a DCS feedback relay KA3, wherein the second contact of the stop button SB1 is connected in series with the DCS feedback relay KA 3; two ends of the shutdown feedback loop are respectively connected with the phase line L and the zero line N; the DCS feedback relay KA3 is configured to send a stop signal to the DCS system when the DCS feedback relay KA3 is powered on, and send a stop instruction when the DCS system receives the stop signal.

In an exemplary embodiment, the second contact of the stop button SB1 is configured to be normally open and to be closed when the button is pressed. When the stop button SB1 is pressed, the first contact of the stop button SB1 will be turned off, and the automatic control circuit will be powered off, but at the same time, the second contact of the stop button SB1 will be turned on, so that the DCS feedback relay KA3 will be powered on, and a stop signal will be sent to the DCS system, and when the DCS system receives the stop signal, the DCS system will send a stop command, and the stop command will avoid starting the DCS anti-glare program.

In an exemplary embodiment, the control circuit for safely stopping the DCS anti-glare program further includes: a fuse FU connected in series on the phase line L. The fuse FU is used for protecting the current, generally consists of a melt and a fusion tube, and is connected in series in a circuit as a metal conductor, and when the current exceeds a certain value, the current is disconnected, so that the protection effect is achieved.

In an exemplary embodiment, the control circuit for safely stopping the DCS anti-glare program further includes: a motor protector KH connected in series on the main control loop. The motor protector KH has the protection functions of overload, open phase, unbalance, underload, grounding/leakage, blocking and the like, and can form a motor control protection unit together with electric elements such as a contactor, a motor starter and the like.

The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present utility model. Any other embodiments which are extended according to the solution of the utility model without inventive effort fall within the scope of protection of the utility model for a person skilled in the art.

Claims

1. A control circuit for safely stopping a DCS anti-ringing program, comprising:

a main control loop, the main control loop comprising: the DCS stop relay, the first contact of the stop button, the coil of the main contactor and the contact of the main contactor are sequentially connected in series; two ends of the main control loop are respectively connected with the phase line and the zero line;

a manual control circuit, the manual control circuit comprising: the switching device comprises a first connecting point of a change-over switch, a second connecting point of the change-over switch and a starting button, wherein the starting button is connected in series with the first connecting point of the change-over switch and the second connecting point of the change-over switch; the manual control loop is connected in parallel with the two ends of the contact of the main contactor;

an automatic control loop, the automatic control loop comprising: the DCS starting relay is connected with the third connection point of the conversion switch and the fourth connection point of the conversion switch in series; the automatic control loop is connected in parallel with the two ends of the contact of the main contactor;

the change-over switch is configured to be communicated between a first connection point and a second connection point of the change-over switch when the change-over switch is switched to the manual control loop, and to be disconnected between a third connection point and a fourth connection point of the change-over switch when the change-over switch is switched to the automatic control loop, and to be communicated between the first connection point and the second connection point of the change-over switch;

a shutdown feedback loop, the shutdown feedback loop comprising: a second contact of the stop button and a DCS feedback relay are connected in series; the two ends of the shutdown feedback loop are respectively connected with the phase line and the zero line;

the DCS feedback relay is configured to send a stop signal to the DCS system when the DCS feedback relay is powered on, and send a stop instruction when the DCS system receives the stop signal.

2. The control circuit for a safety-stop DCS anti-glare program of claim 1, further comprising: and the fuse is connected in series on the phase line.

3. The control circuit for a safety-stop DCS anti-glare program of claim 1, further comprising: and the motor protector is connected in series on the main control loop.

4. The control circuit for safely stopping a DCS anti-glare program according to claim 1, wherein the DCS stop relay is configured to be normally closed and to be turned off when receiving a stop command transmitted from the DCS system.

5. The control circuit for a safety stop DCS anti-glare program of claim 1, wherein the first contact of the stop button is configured to be normally closed and to be opened when the button is pressed.

6. The control circuit for a safety-stop DCS anti-glare program of claim 1, wherein the second contact of the stop button is configured to be normally open and to be closed when the button is pressed.

7. The control circuit for a safety-stop DCS anti-glare program of claim 1, wherein the start button is configured to be normally open and to be closed when the button is pressed.

8. The control circuit for safely stopping a DCS anti-glare program according to claim 1, wherein the DCS start relay is configured to be in a normally open state and to be in a closed state when receiving a start command transmitted from the DCS system.