CN219554576U - Anti-interference circuit realized by DCS system - Google Patents

Anti-interference circuit realized by DCS system Download PDF

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Publication number
CN219554576U
CN219554576U CN202320212681.2U CN202320212681U CN219554576U CN 219554576 U CN219554576 U CN 219554576U CN 202320212681 U CN202320212681 U CN 202320212681U CN 219554576 U CN219554576 U CN 219554576U
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China
Prior art keywords
dcs
connection point
change
over switch
control loop
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CN202320212681.2U
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Inventor
杨海生
徐亮
常生睿
马力明
冯保山
李海升
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Ningxia Baofeng Energy Group Co ltd
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Ningxia Baofeng Energy Group Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Motor And Converter Starters (AREA)

Abstract

The utility model provides an anti-interference circuit realized by a DCS system, which comprises: a main control loop comprising: DCS stops relay KA1, stop button SB1, coil of main contactor KM and first contact of main contactor KM; 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; an electrical glare feedback loop comprising: a second contact of the main contactor KM and a DCS feedback relay KA3. When the electric network is in electric interference, the DCS system immediately sends out a starting instruction, the starting loop of the motor is kept in a connection state, and when the electric interference is over, the motor is restored to normal operation, so that the anti-electric interference function is realized.

Description

Anti-interference circuit realized by DCS system
Technical Field
The utility model relates to the technical field of anti-interference electricity, in particular to an anti-interference electricity circuit realized by a DCS system.
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 existing anti-interference function is mainly realized by devices such as an anti-interference contactor, an anti-interference module and the like.
However, the anti-interference electric contactor and the anti-interference electric module are large in size, occupy the space of the power distribution cabinet, increase the maintenance difficulty and the failure rate of the power distribution cabinet, and have potential safety hazards. In addition, the anti-interference electric contactor and the anti-interference electric module have higher manufacturing cost, and the cost is greatly increased due to the large-scale use.
Disclosure of Invention
The utility model provides an anti-interference circuit realized by a DCS system, which aims to solve the problems that an anti-interference contactor and an anti-interference module are large in size, occupy the space of a power distribution cabinet and increase the difficulty in inspection and maintenance and the failure rate of the power distribution cabinet.
The utility model provides an anti-interference circuit realized by a DCS system, which comprises: a main control loop, the main control loop comprising: the DCS stopping relay KA1 contact, the stopping button SB1, the coil of the main contactor KM and the first contact of the main contactor KM are sequentially connected in series; two ends of the main control loop are respectively connected with the phase line L and the zero line N; a manual control circuit, the manual control circuit comprising: the switching device comprises a first connection point of a change-over switch SA, a second connection point 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 of the change-over switch SA and the second connection point of the change-over switch SA; the manual control loop is connected in parallel with two ends of a contact of the main contactor KM; an automatic control loop, the automatic control loop comprising: the third connection point of the change-over switch SA, the fourth connection point of the change-over switch SA and the contact of the DCS starting relay KA2 are connected in series; 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 and a second connection point of the change-over switch SA when the change-over switch SA is switched to the manual control loop, to be disconnected between a third connection point and a fourth connection point of the change-over switch SA when the change-over switch SA is switched to the automatic control loop, to be disconnected between the first connection point and the second connection point of the change-over switch SA, and to be communicated between the third connection point and the fourth connection point of the change-over switch SA; an electrical glare feedback loop comprising: the second contact of the main contactor KM and the coil of the DCS feedback relay KA3 are connected in series; two ends of the electric interference feedback loop are respectively connected with the phase line L and the zero line N; the coil of the DCS feedback relay KA3 is configured to send a working signal to the DCS system when the coil of the DCS feedback relay KA3 is powered on, send a shaking signal to the DCS system when the coil of the DCS feedback relay KA3 is powered off, and send a starting instruction when the DCS system receives the shaking signal; the set time of the starting instruction is longer than the duration time of the power-on interference.
Optionally, the anti-interference circuit further includes: a fuse FU connected in series on the phase line L.
Optionally, the anti-interference circuit further includes: and the contacts of the motor protector KH are connected in series on the main control loop.
Optionally, the contacts of the DCS stop relay KA1 are configured to be in a normally closed state, and are turned into an open state when receiving a stop command sent by the DCS system.
Optionally, the setting time of the stop instruction is longer than the setting time of the start instruction.
Alternatively, the stop button SB1 is configured to be normally closed, and is turned to be off when the button is pressed.
Alternatively, the start button SB2 is configured to be in a normally open state, and is changed to be in a closed state when the button is pressed.
Optionally, the contacts of the DCS start relay KA2 are configured to be in a normally open state, and are changed into a closed state when receiving a start command sent by the DCS system.
Optionally, the set time of the start instruction is 50ms-800ms.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model provides an anti-interference circuit realized by a DCS system, which comprises: a main control loop comprising: the DCS stops the contact of the relay KA1, the stop button SB1, the coil of the main contactor KM and the first contact of the main contactor KM; 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 contacts of the DCS starting relay KA2; an electrical glare feedback loop comprising: a second contact of the main contactor KM and a coil of the DCS feedback relay KA3. When the electric network releases the contactor and the relay due to the electric interference, the DCS system immediately sends out a starting instruction, the starting loop of the motor is kept in a connection state, and after the voltage is recovered to be normal within a set time, the motor is recovered to be in normal operation, so that the anti-electric interference function is realized.
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 an anti-sloshing circuit implemented by using a DCS system 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, decentralized control system) is a new generation instrument control system based on a microprocessor, adopts a design principle of decentralized control function, centralized display operation and simultaneous autonomous and comprehensive coordination, adopts a basic design idea of centralized control, operation and management, adopts a multi-layer hierarchical and cooperative autonomous structural form, 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 an anti-interference circuit realized by a DCS system, as shown in figure 1, comprising:
a main control loop, the main control loop comprising: the DCS stopping relay KA1 contact, the stopping button SB1, the coil of the main contactor KM and the first 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 first contact and a second contact of the main contactor KM are closed; when the coil of the main contactor KM is de-energized, the motor stops and the first contact and the second contact of the main contactor KM are opened.
In an exemplary embodiment, the contacts of the DCS stop relay KA1 are configured to be normally closed, and are turned to be turned off when receiving a stop command sent from the DCS system. The contacts of the DCS stop relay KA1 are connected in series in the main control loop and are controlled by the DCS system to be 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, so that the contacts of the DCS stop relay KA1 are turned into an off state, the main control loop is disconnected, and the coil of the main contactor KM is powered off.
In an exemplary embodiment, the stop button SB1 is configured to be normally closed, and to be turned off when the button is pressed. The stop button SB1 is connected in series in the main control loop and is used 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 needs to be stopped, the button can be manually pressed to enable 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 contact of 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 changed into a closed state, the manual control loop is connected, the coil of the main contactor KM is electrified, the first contact of the main contactor KM is closed and self-maintained, and the main control loop is kept on, and at the moment, the motor starts to run.
In an exemplary embodiment, the contacts of the DCS start relay KA2 are configured to be normally open, and to be closed when a start command sent by the DCS system is received. When switching to the automatic control loop, the DCS system sends a starting instruction, the contacts of the DCS starting relay KA2 are changed into a closed state, the automatic control loop is connected, the coil of the main contactor KM is electrified, the first contacts of the main contactor KM are closed and self-maintained, the main control loop is kept on, and the motor starts to run at the moment.
An electrical glare feedback loop comprising: the second contact of the main contactor KM and the coil of the DCS feedback relay KA3 are connected in series; two ends of the electric interference feedback loop are respectively connected with the phase line L and the zero line N; the coil of the DCS feedback relay KA3 is configured to send a working signal to the DCS system when the coil of the DCS feedback relay KA3 is powered on, send a shaking signal to the DCS system when the coil of the DCS feedback relay KA3 is powered off, and send a starting instruction when the DCS system receives the shaking signal; the set time of the starting instruction is longer than the duration time of the power-on interference.
When the coil of the main contactor KM is electrified, the second contact of the main contactor KM is closed, so that the interference feedback loop is switched on, the coil of the DCS feedback relay KA3 is electrified, a working signal is sent to the DCS system, and the motor works normally. When the electric interference occurs, the coil of the main contactor KM loses electricity, so that the first contact and the second contact of the main contactor KM are disconnected, and if an electric interference feedback loop does not exist, the motor is stopped, and the work is influenced. However, when the second contact of the main contactor KM is disconnected, the coil of the DCS feedback relay KA3 is de-energized, and a shaking signal is sent to the DCS system, and when the shaking signal is received by the DCS system, the DCS system sends a start command; when the electricity interference is over, the automatic control loop reacquires electricity, at the moment, because the starting instruction enables the contacts of the DCS starting relay KA2 to keep a closed state, the coil of the main contactor KM reacquires electricity, the first contact of the main contactor KM is closed and self-maintained, the motor continues to operate, and the second contact of the main contactor KM is also closed, so that the coil of the DCS feedback relay KA3 is electrified, and working signals are sent to the DCS system again.
Typical duration of the general power-up is 10ms-600ms, so in an exemplary embodiment, the set time of the start-up command is 50ms-800ms.
In an exemplary embodiment, the set time of the stop command is greater than the set time of the start command. When the DCS system sends a stop instruction, the coil of the main contactor KM is powered off, so that the second contact of the main contactor KM is disconnected, and the DCS system sends a start instruction. Therefore, the setting time of the stop command is longer than the setting time of the start command, and the setting time of the stop command can be 1.5-3 times of the setting time of the start command, so that the false start of the electric interference program can be avoided, and the motor can be stably stopped.
In an exemplary embodiment, the anti-interference circuit 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 anti-interference circuit further includes: and the contacts of the motor protector KH are 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 utility model provides an anti-interference circuit realized by a DCS system, which comprises: a main control loop comprising: the DCS stops the contact of the relay KA1, the stop button SB1, the coil of the main contactor KM and the first contact of the main contactor KM; 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 contacts of the DCS starting relay KA2; an electrical glare feedback loop comprising: a second contact of the main contactor KM and a coil of the DCS feedback relay KA3. When the electric network releases the contactor and the relay due to the electric interference, the DCS system immediately sends out a starting instruction, the starting loop of the motor is kept in a connection state, and after the voltage is recovered to be normal within a set time, the motor is recovered to be in normal operation, so that the anti-electric interference function is realized.
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 (9)

1. An anti-interference circuit implemented by a DCS system, comprising:
a main control loop, the main control loop comprising: the DCS stopping relay KA1 contact, the stopping button SB1, the coil of the main contactor KM and the first contact of the main contactor KM are sequentially connected in series; two ends of the main control loop are respectively connected with the phase line L and the zero line N;
a manual control circuit, the manual control circuit comprising: the switching device comprises a first connection point of a change-over switch SA, a second connection point 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 of the change-over switch SA and the second connection point of the change-over switch SA; the manual control loop is connected in parallel with two ends of a contact of the main contactor KM;
an automatic control loop, the automatic control loop comprising: the third connection point of the change-over switch SA, the fourth connection point of the change-over switch SA and the contact of the DCS starting relay KA2 are connected in series; 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 and a second connection point of the change-over switch SA when the change-over switch SA is switched to the manual control loop, to be disconnected between a third connection point and a fourth connection point of the change-over switch SA when the change-over switch SA is switched to the automatic control loop, to be disconnected between the first connection point and the second connection point of the change-over switch SA, and to be communicated between the third connection point and the fourth connection point of the change-over switch SA;
an electrical glare feedback loop comprising: the second contact of the main contactor KM and the coil of the DCS feedback relay KA3 are connected in series; two ends of the electric interference feedback loop are respectively connected with the phase line L and the zero line N;
the coil of the DCS feedback relay KA3 is configured to send a working signal to the DCS system when the coil of the DCS feedback relay KA3 is powered on, send a shaking signal to the DCS system when the coil of the DCS feedback relay KA3 is powered off, and send a starting instruction when the DCS system receives the shaking signal; the set time of the starting instruction is longer than the duration time of the power-on interference.
2. The anti-ringing circuit of claim 1 implemented with a DCS system, the anti-ringing circuit further comprising: a fuse FU connected in series on the phase line L.
3. The anti-ringing circuit of claim 1 implemented with a DCS system, the anti-ringing circuit further comprising: and the contacts of the motor protector KH are connected in series on the main control loop.
4. The anti-sloshing circuit implemented using a DCS system according to claim 1, wherein the contacts of the DCS stop relay KA1 are configured to be normally closed, and to be turned off when receiving a stop command transmitted from the DCS system.
5. The anti-ringing circuit of claim 4, wherein the stop command is set for a greater time than the start command.
6. An anti-ringing circuit implemented with a DCS system as claimed in claim 1, wherein the stop button SB1 is configured to be normally closed and to be turned off when the button is pressed.
7. An anti-ringing circuit implemented with a DCS system according to claim 1, wherein the start button SB2 is configured to be normally open and to be closed when the button is pressed.
8. The anti-interference circuit according to claim 1, wherein the contacts of the DCS start relay KA2 are configured to be normally open and to be closed when a start command sent from the DCS system is received.
9. The anti-interference circuit according to claim 1, wherein the setting time of the start command is 50ms to 800ms.
CN202320212681.2U 2023-02-14 2023-02-14 Anti-interference circuit realized by DCS system Active CN219554576U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320212681.2U CN219554576U (en) 2023-02-14 2023-02-14 Anti-interference circuit realized by DCS system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320212681.2U CN219554576U (en) 2023-02-14 2023-02-14 Anti-interference circuit realized by DCS system

Publications (1)

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CN219554576U true CN219554576U (en) 2023-08-18

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