CN207618508U - A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor - Google Patents
A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor Download PDFInfo
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- CN207618508U CN207618508U CN201721805517.3U CN201721805517U CN207618508U CN 207618508 U CN207618508 U CN 207618508U CN 201721805517 U CN201721805517 U CN 201721805517U CN 207618508 U CN207618508 U CN 207618508U
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Abstract
The utility model is related to a kind of systems of induced voltage in elimination program-controlled circuit of coal conveyor, and instruction disconnecting relay includes relay contact and relay pitch of the laps；Every switch board includes feedback isolation relay and DCS controllers；Wherein, equipment is fed back and protection circuit connect to form feedback protection circuit by unmasked signal cable with feedback isolation relay; the feedback protection circuit is powered by 48VDC DC power supplies; when early warning occurs in a certain equipment of coal conveyor; the equipment is fed back by the equipment in component controls case and feedback signal is transmitted to feedback isolation relay by protection circuit with dry node signal, and feedback command is transmitted to DCS controllers by feedback isolation relay；DCS controllers connect to form instruction transmission circuit with relay pitch of the laps by unmasked signal cable.The utility model removes the 220VAC electricity in cable, to eliminate ac induction voltage by using the mode for increasing disconnecting relay.
Description
Technical field
The invention belongs to technical field of power systems, and in particular to a kind of to eliminate induced voltage in the program-controlled circuit of coal conveyor
System.
Background technology
Thermal power plant's coal handing system is worked by the way of coal to run coal bin on bucket wheel machine or paddle coal feeder, system fortune
Row rises according to inverse along stopping principle.Coal handling plant runs site environment rather harsh, rainwater, dust, humidity, vibration, noise, electromagnetism
Interference is all than more serious, and entire coal handling system control dispersion, and coverage distance is remote, and coal handling system equipment is more, and mutual linking is numerous
It is miscellaneous, especially coal handling system signal wire（Light current）With control line（Forceful electric power）Using same cable, coal handing system sense is caused
Answer voltage big and the frequent malfunction of protection signal.
Due to the startup of coal handling plant, stop inverse rising along principle is stopped, when equipment starts, start at first close to run coal bin
Belt starts to coal source belt successively.When stopping, first stopping coal equipment（Paddle coal feeder, bucket wheel machine）, then by coal source
Belt stops successively to coal bunker end belt（It is opposite with boot sequence）.When equipment starts, when the equipment that any level-one starts cannot
When startup, the equipment having been turned on is simultaneously emitted by alarm signal by along coal stream direction delay tripping.In normal operation, when arbitrary
When the device fails of one equipment interlocking operation are shut down, remaining equipment should be interrupted by the relationship of chain stopping along coal stream direction
Operation, is simultaneously emitted by alarm signal, therefore any equipment existing defects then mean that whole flow process can not go on.
The faradic difficulty of thermal power plant's coal handing system is eliminated since the prior art can not solve low cost under bad environments
Topic, the first prior art cause difficulty of construction big because coal handing system control range is too big, and improvement expenses are high；Secondly electricity
There is also alternating currents in cable, since coal handling plant running environment is severe, cable can not reliable ground, so can not fundamentally disappear
Except thermal power plant's coal handing system induced electricity.
Invention content
The purpose of the present invention is to provide a kind of systems of induced voltage in elimination program-controlled circuit of coal conveyor.The present invention passes through
Power supply using DC voltage as control system instruction and feedback isolation relay, can reduce the friendship between cable and cable
Induced voltage is flowed, and voltage class is decreased obviously to safe voltage, and DC relay is influenced slight.
The technical solution adopted by the present invention：A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor, coal conveyor journey
It includes several component controls casees and several switch boards corresponding with component controls case to control in equipment, and every component controls case includes
Contactor, instruction disconnecting relay, equipment feedback and protection circuit, 48VDC DC power supplies and 220VAC AC powers are instructed, is referred to
It includes relay contact and relay pitch of the laps to enable disconnecting relay；Every switch board includes feedback isolation relay and DCS controls
Device；Wherein, equipment feedback and protection circuit connect to form feedback protection by unmasked signal cable with feedback isolation relay
Circuit, the feedback protection circuit are powered by 48VDC DC power supplies, and when early warning occurs in a certain equipment of coal conveyor, which passes through
Feedback signal is transmitted to feedback isolation relay by equipment feedback and protection circuit in component controls case with dry node signal, instead
Feedback command is transmitted to DCS controllers by feedback disconnecting relay；DCS controllers pass through unmasked signal cable and relay pitch of the laps
Connection forms instruction transmission circuit, and instruction transmission circuit is powered by 48VDC DC power supplies, controlled by the DCS in switch board
To the relay pitch of the laps send instructions of instruction disconnecting relay, relay contact connect device processed with relay pitch of the laps, relay around
Circle is closed after receiving instruction, control relay contact action；Relay contact in instruction disconnecting relay is contacted with instruction
Device connects to form equipment start-stop circuit by unmasked signal cable, which is supplied by 220VAC AC powers
Electricity, control instruction contactor acts after relay contact action, and the component controls case that the equipment of early warning occurs in coal conveyor stops fortune
Row.
Further, the instruction disconnecting relay is 48VDC direct current disconnecting relays.
Advantage is the present invention compared with prior art：The present invention by using increase disconnecting relay mode,
Remove the 220VAC electricity in cable, to eliminate ac induction voltage；This invention removes certain thermal power plant's coal handing system senses
Voltage is answered, relay is avoided and causes fire because of the high frequent movement of induced voltage, avoid protection signal because of induced voltage height
And malfunction, and the protection signal of all devices comes into operation, and improves coal handling system overall security and reliability.Change
It makes and saves money more than 180 ten thousand yuan than replacing cable mode by the way of increasing disconnecting relay（It is all kinds of according to more than 70000 meters
Type cable statistics calculates）.Through investigation, it is found that most of Coal Transportation System has that induced voltage, the method have very
Big promotional value.The present invention does not use alternating current in a manner of increasing disconnecting relay, using DC power transmission signal, leads to
Overtesting：Local control box 220VAC power supplys are cut off, cable induction electricity can be generally reduced 22VAC, and two-way is all cut off, cable sense
Answer electricity that can be generally reduced to 10VAC-15VAC, this part induced electricity mostlys come from the induced electricity between cable and cable.For
This, and the 220VAC power supplys in cable are all used instead the experiment of 24VDC power supplys, it is found that belt control induced electricity exists
Within the scope of 7VAC to 15VAC, coal plough controls feedback-induced electricity within the scope of 21.3VAC to 23.4VAC.In addition deviation switch makes
With close to switch, under conditions of signal is not closed, signal wire has the voltage of 40VAC.Through overtesting, 24VDC power supplys are found,
Because transmission range is too long, there is relaxation phenomenon, so in transformation, uses 48VDC power supplys.
Description of the drawings
Fig. 1 is the circuit theory schematic diagram of the present invention.
Specific implementation mode
As shown in Figure 1, a kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor, coal conveyor program-controlled equipment include
It includes that instruction contacts to have several component controls casees 1 and several switch boards 2 corresponding with component controls case 1, every component controls case 1
Device 3, instruction disconnecting relay 4, equipment feedback and protection circuit 5,48VDC DC power supplies 6 and 220VAC AC powers 7, instruction
Disconnecting relay 4 includes relay contact 8 and relay pitch of the laps 9；Every switch board 2 of controller includes feedback isolation relay
10 and DCS controllers 11；Wherein, equipment feedback and protection circuit 5 pass through unmasked signal cable and feedback isolation relay 10
Connection forms feedback protection circuit, which is powered by 48VDC DC power supplies 6, when a certain equipment of coal conveyor goes out
Existing early warning, which is fed back by the equipment in component controls case 1 and protection circuit 5 transmits feedback signal with dry node signal
To feedback isolation relay 10, feedback command is transmitted to DCS controllers 11 by feedback isolation relay 10；DCS controllers 11 are logical
It crosses unmasked signal cable and connect formation instruction transmission circuit with relay pitch of the laps 9, instruction transmission circuit passes through 48VDC direct currents
Power supply 6 power, by the DCS controllers 11 in switch board 2 to instruction disconnecting relay 49 send instructions of relay pitch of the laps, after
Appliance contact 8 is connect with relay pitch of the laps 9, and relay pitch of the laps 9 is closed after receiving instruction, and control relay contact 8 acts；Refer to
The relay contact 8 in disconnecting relay 4 is enabled to connect to form equipment start-stop time by unmasked signal cable with instruction contactor 3
Road, the equipment start-stop circuit are powered by 220VAC AC powers 7, and control instruction contactor 3 is dynamic after relay contact 8 acts
Make, the component controls case 1 that the equipment of early warning occurs in coal conveyor is out of service.The instruction disconnecting relay 4 is 48VDC direct currents
It is electrically isolated relay.
Power supply of the present invention by using DC voltage as control system instruction and feedback isolation relay, can reduce
Ac induction voltage between cable and cable, and voltage class is decreased obviously to safe voltage, and to DC relay shadow
It rings slight.Therefore, equipment feedback uses 48VDC disconnecting relay isolation methods, instruction to use the relay 48VDC way of outputs.
Wherein, coal handing system uses two-way redundant power to power for 48VDC power modules, and 48VDC power modules also use redundancy
Configuration ensures power supply reliability.Coal conveying adjusts circuit, and output order does not use stem grafting point mode, but uses output
48VDC modes, for driving local control box 220VAC disconnecting relays；Feedback signal enters 48VDC disconnecting relays.Defeated coal
Equipment local control box adjusts circuit, and all local control box feedbacks are changed to dry contact, and all local control boxes receive 48VDC
Switch order.
Claims (2)
1. a kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor, includes several component controls in coal conveyor program-controlled equipment
Case processed and several switch boards corresponding with component controls case, which is characterized in that every component controls case includes instruction contactor, refers to
Disconnecting relay, equipment feedback and protection circuit, 48VDC DC power supplies and 220VAC AC powers are enabled, disconnecting relay is instructed
Including relay contact and relay pitch of the laps；Every switch board includes feedback isolation relay and DCS controllers；Wherein, equipment
Feedback and protection circuit connect to form feedback protection circuit by unmasked signal cable with feedback isolation relay, which protects
Shield circuit is powered by 48VDC DC power supplies, and when early warning occurs in a certain equipment of coal conveyor, which passes through in component controls case
Equipment is fed back and feedback signal is transmitted to feedback isolation relay by protection circuit with dry node signal, and feedback isolation relay will
Feedback command is transmitted to DCS controllers；DCS controllers connect to form instruction biography with relay pitch of the laps by unmasked signal cable
Send road back to, instruction transmission circuit is powered by 48VDC DC power supplies, is isolated to instruction by the DCS controllers in switch board
The relay pitch of the laps send instructions of relay, relay contact is connect with relay pitch of the laps, after relay pitch of the laps receives instruction
It is closed, control relay contact action；Relay contact in instruction disconnecting relay is believed with instruction contactor by unmasked
Number cable connection forms equipment start-stop circuit, which is powered by 220VAC AC powers, and relay contact is dynamic
Control instruction contactor acts after work, and the component controls case that the equipment of early warning occurs in coal conveyor is out of service.
2. a kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor according to claim 1, which is characterized in that institute
The instruction disconnecting relay stated is 48VDC direct current disconnecting relays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721805517.3U CN207618508U (en) | 2017-12-21 | 2017-12-21 | A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721805517.3U CN207618508U (en) | 2017-12-21 | 2017-12-21 | A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207618508U true CN207618508U (en) | 2018-07-17 |
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ID=62821301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721805517.3U Expired - Fee Related CN207618508U (en) | 2017-12-21 | 2017-12-21 | A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207618508U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107963422A (en) * | 2017-12-21 | 2018-04-27 | 毕冠华 | A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor |
-
2017
- 2017-12-21 CN CN201721805517.3U patent/CN207618508U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107963422A (en) * | 2017-12-21 | 2018-04-27 | 毕冠华 | A kind of system for eliminating induced voltage in the program-controlled circuit of coal conveyor |
| CN107963422B (en) * | 2017-12-21 | 2024-04-09 | 毕冠华 | System for eliminating induced voltage in program-controlled circuit of coal conveyor |
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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: 20180717 Termination date: 20211221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |