CN107560867A - Small turbine low pressure main inlet throttle-stop valve stroke experiment control system - Google Patents
Small turbine low pressure main inlet throttle-stop valve stroke experiment control system Download PDFInfo
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- CN107560867A CN107560867A CN201710950878.5A CN201710950878A CN107560867A CN 107560867 A CN107560867 A CN 107560867A CN 201710950878 A CN201710950878 A CN 201710950878A CN 107560867 A CN107560867 A CN 107560867A
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- low pressure
- stop valve
- main inlet
- inlet throttle
- pressure main
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Abstract
The invention discloses a kind of small turbine low pressure main inlet throttle-stop valve stroke experiment control system,Low pressure main inlet throttle-stop valve protects system and electrohydraulic control system to control by emergency trip,The low pressure main inlet throttle-stop valve includes standard-sized sheet travel switch,Travel switch at fully closed travel switch and 75% stroke,The reset of the switch board of the emergency trip protection system waits the normally opened contact connection power supply of auxiliary reclay and opens low pressure main inlet throttle-stop valve button loop,Increase reset condition in the control logic of electrohydraulic control system,The reset condition is,When starting to test and closing low pressure main inlet throttle-stop valve,Increase by a pulse signal,Logical "or" computing is made in the pulse signal and the test of low pressure main inlet throttle-stop valve in place,Either condition meets,Low pressure main inlet throttle-stop valve instruction preset will be closed,Instructed simultaneously with sending out low pressure main inlet throttle-stop valve after delay disconnection carries out logic "and" operation in pass low pressure main inlet throttle-stop valve instruction.It can prevent due to when travel switch is unable to accurate response porthole position signalling at 75%, causing the tripping operation to pump.
Description
Technical field
The invention belongs to power plant electrical equipment technical field, more particularly to a kind of small turbine low pressure main inlet throttle-stop valve stroke
Experiment control system.
Background technology
To pump（Give mercury vapour turbine）Low pressure main inlet throttle-stop valve is small turbine isolation porthole, when small turbine and pump housing appearance are critical
When being needed during situation to pump and small turbine hard stop, it is desirable to closed immediately to pump high and low pressure main inlet throttle-stop valve.Normally transported to pump
The regulation of throttle flow is switched by high and low pressure pitch to realize during row, and high and low pressure main inlet throttle-stop valve is in and opens sufficient state.For
The purpose of protection equipment safety, prevents Steam Turbine Over-speed Accident and bearing shell burning damage accident occurs, according to《Prevent power generation weight
25 important requirements of major break down》And the regulation in operating standard and maintenance procedure, ensure on operating unit to pump it is high,
Low pressure main inlet throttle-stop valve not bite, so valve must carry out regular activity experiment on operating unit, check control loop, magnetic valve
Work whether normal, the active situation of executing agency.Mounting process to the travel switch of pump low pressure main inlet throttle-stop valve requires high, low pressure master
Porthole stroke is that the travel switch that 100mm. is used is relatively large sized, travel switch at standard-sized sheet and 75%（That is stroke experiment recovers
Signal）Installation site Relatively centralized.But it is also easy to produce following problem：Small influence each other is spaced between each travel switch can not be accurate
Reflection position, travel switch output arm are big compared with long differential gap；Travel switch and low pressure main inlet throttle-stop valve feedback transmission mechanism contact position
It is required that it is high, damage travel switch apart from small, the big driving trip that is then unable to of distance switchs, meanwhile, travel switch erecting bed shakes
It is dynamic its installation site is drifted about.Due to above mentioned problem prevent travel switch is from action promptly and accurately at 75% so that
It can not voluntarily recover in time during experiment, porthole is closed to cause and tripped to pump.
The content of the invention
For defect present in prior art and deficiency, the purpose of the present invention is to propose to a kind of small turbine low pressure master
Porthole stroke experiment control system.To pump low pressure main inlet throttle-stop valve scene all parts it is working properly when, will not occur due to row at 75%
When Cheng Kaiguan is unable to accurate response porthole position signalling, cause the tripping operation to pump.
The technical scheme is that：
A kind of small turbine low pressure main inlet throttle-stop valve stroke experiment control system, it is characterised in that low pressure main inlet throttle-stop valve is protected by emergency trip
Protecting system（ETS）And electrohydraulic control system（MEH）Control, the low pressure main inlet throttle-stop valve includes standard-sized sheet travel switch, fully closed stroke is opened
Close and wait the normally opened of auxiliary reclay with travel switch at 75% stroke, the reset of the switch board of the emergency trip protection system
Contact portion power supply and low pressure main inlet throttle-stop valve button loop is opened, increase reset condition, institute in the control logic of electrohydraulic control system
It is when starting to test and close low pressure main inlet throttle-stop valve to state reset condition, increases by a pulse signal, the pulse signal and low pressure main inlet throttle-stop valve are surveyed
Logical "or" computing is made in examination in place, and either condition meets, will close low pressure main inlet throttle-stop valve instruction preset, while with closing low pressure main inlet throttle-stop valve
Instruction sends out the instruction of low pressure main inlet throttle-stop valve after delay disconnects progress logic "and" operation.
Preferably, when starting to test and closing low pressure main inlet throttle-stop valve, a pulse signal is sent after 5s.
Compared with prior art, it is an advantage of the invention that：
The experiment of low pressure main inlet throttle-stop valve partial journey can be carried out periodically, be not in that low pressure main inlet throttle-stop valve is closed during experiment, drawn
Play tripping operation to pump, it is ensured that to pump when carrying out the experiment unit safe and stable operation, moreover, joining originally to pump low pressure main inlet throttle-stop valve
Lock function keeps constant.Ensure stable operation of unit and reduce the electric pump number of starts, reach reduction station service, improve unit operation
Economy.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Fig. 1 is MEH of the present invention control logic schematic diagram；
Fig. 2 is the partial schematic diagram of the control principle drawing of low pressure main inlet throttle-stop valve of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to embodiment and join
According to accompanying drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright scope.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring this
The concept of invention.
A kind of small turbine low pressure main inlet throttle-stop valve stroke experiment control system, small turbine give pump low pressure main inlet throttle-stop valve by critical
Interdict protection system（ETS）And electrohydraulic control system（MEH）Two systems control, and ETS systems are by control panel, switch board, existing
Field device and its cable of interconnection composition, control panel have high and low main inlet throttle-stop valve control instruction button and show each main inlet throttle-stop valve
With pitch location status information indicator lamp and system power state indicator lamp；There are auxiliary reclay, contactor, power supply in switch board
Loop forms, and realizes the control logic function consistent with technological process requirement and drives field apparatus；Meanwhile realize field apparatus
With MEH control instructions and the linkage function of feedback signal；Field apparatus is made up of magnetic valve and travel switch.Low pressure main inlet throttle-stop valve
Switch is by two solenoid-drivens, control of this equipped with travel switch composition at three travel switch standard-sized sheets, fully closed, 75% stroke
Loop processed.
As shown in figure 1, changing MEH control logics, increase experiment reset condition, that is, start to test and start to close low pressure master
During porthole, increase a pulse signal, a pulse is sent after 5s and logical "or" fortune is made in the test of low pressure main inlet throttle-stop valve in place
Calculate, either condition meets, will close low pressure main inlet throttle-stop valve instruction preset, while carry out with being disconnected in pass low pressure main inlet throttle-stop valve instruction through delay
Low pressure main inlet throttle-stop valve is sent out after logic "and" operation to instruct to ETS switch board internal trigger auxiliary reclay R/PB-SVOP (L).By
When former logical design is not turned off for high, middle pressure pitch, it is impossible to low pressure main inlet throttle-stop valve is opened, so it controls power supply access failure, so
When open low pressure main inlet throttle-stop valve instruction be not acted upon.
As shown in Fig. 2 ETS switch boards internal wiring is changed, when being not turned off due to former logical design for high, middle pressure pitch,
Low pressure main inlet throttle-stop valve can not be opened, thus its control power supply access failure, so when open low pressure main inlet throttle-stop valve instruction be not acted upon.So profit
With the normally opened contact for resetted when experiment is carried out wait auxiliary reclay R/SVT, access power supply and open the instruction of low pressure main inlet throttle-stop valve
Loop, i.e., it is in parallel with high, middle pressure pitch shutdown signal, such as scheme upper dotted portion, the contact is low to open when being tested
Press main inlet throttle-stop valve button loop power supply.
Test operation procedure is formulated, must be carried out when being tested on MEH pictures so that the MEH controls that automatically reset are patrolled
Collect and work；When being tested, operations staff is observed to scene, can be by when low pressure main inlet throttle-stop valve departs from fully open position
Low pressure main inlet throttle-stop valve button is driven, experiment is terminated in advance.
The control action of whole system is illustrated below, wherein：
33/SVOP (L) low pressure main inlet throttle-stop valve drives sufficient travel switch
33/SVCL (L) low pressure main inlet throttle-stop valve shutoff stroke switchs
Travel switch at 33/SVT (L) low pressure main inlet throttle-stop valve 75%
R/SVOP (L) low pressure main inlet throttle-stop valve drives sufficient auxiliary reclay
R/SVCL (L) low pressure main inlet throttle-stop valve closes auxiliary reclay
Auxiliary reclay at R/SVTP (L) low pressure main inlet throttle-stop valve 75%
Low pressure main inlet throttle-stop valve commands relays are opened in R//PB-SVOP (L) ETS or MEH output
R/PB-SVT (L) ETS or MEH output order auxiliary reclays
R/SVT (L) low pressure main inlet throttle-stop valve tests auxiliary reclay
52/SVCL (L) closes low pressure main inlet throttle-stop valve contactor（Control live magnetic valve）
52/SVOP(L)：Drive low pressure main inlet throttle-stop valve contactor（Control live magnetic valve）
Specific test procedure is as follows：
The experiment of 1 partial journey is tested in MEH systems, specific steps：Following four condition is satisfied by：
1.1：Signal is not operating in place for the test of low pressure main inlet throttle-stop valve；
1.2：The measurement of rotating speed loop is normal；
1.3：Do not tripped to pump；
1.4：Low pressure main inlet throttle-stop valve is in fully open position；I.e. travel switch 33/SVOP (L) is in on-state.
2 operations staffs click on MEH control interface mesolow stop valve test buttons, output contact closure signal, send one
Individual pulse signal, test voltage main inlet throttle-stop valve TESTLPSB, the signal are sent to ETS switch boards；
3 low pressure main inlet throttle-stop valve positions feedback is opening R/SVOP at foot (L) junction closure so that auxiliary reclay R/PB-SVT is acted；
The relay signal has three road contact outputs：
3.1：Not operating R/PB-SVOP (L) and partial journey travel switch feedback is instructed not to move by opening low pressure main inlet throttle-stop valve all the way
Make R/SVTP（L）And its this relay normally open contact acts to form self-insurance；
3.2：To contact through R/SVT (L) normally closed contacts and R/PB-SVT (L) contact to pass low pressure main inlet throttle-stop valve ring current all the way
Device 52/SVCL (L) is powered, and pass low pressure main inlet throttle-stop valve magnetic valve is powered, so that low pressure main inlet throttle-stop valve is begun to shut off.
3.3 another ways, when low pressure main inlet throttle-stop valve starts to close and so that low pressure main inlet throttle-stop valve is opened sufficient signal release R/SVOP (L) and connect
Point, which is closed and is in pump, hangs lock state R/TT-1 and its low pressure main inlet throttle-stop valve test button R/PB-SVT actions so that middle relay
Device R/SVT is acted.
4 auxiliary reclay R/PB-SVT are acted；The relay signal has three road contact outputs：
4.1：Act to form self-insurance by this relay normally open contact all the way；
4.2：Signal function is to reset wait to cause contactor 52/SVCL (L) dead electricity all the way, and power supply is switched into 52/
In SVOP (L) control loop, when wait low pressure main inlet throttle-stop valve is closed to 75% stroke, triggering Open valve instruction；
4.3：Signal causes out the control power on of low pressure main inlet throttle-stop valve all the way；（It is newly-increased）
5 low pressure main inlet throttle-stop valves test travel switch 33/SVT (L) actions, auxiliary reclay R/SVTP (L) actions；
5.1：R/PB-SVT (L) self-holding circuit is released all the way；
5.2：All the way so that opening low pressure main inlet throttle-stop valve power supply by contact, power supply is by opening the main vapour R/SVT of low pressure（L), R/
SVTP (L), and R/TT-1 cause contactor 52/SVOP (L) to act, and it is powered to drive low pressure main inlet throttle-stop valve magnetic valve, so that low pressure master
Porthole starts to open.
5.3：When low pressure main inlet throttle-stop valve opens foot, 33/SVOP (L) is acted, and R/SVOP (L) normally closed contact disconnects so that R/
SVT (L) self-insurance releases；Experiment is completed.
If 6 low pressure main inlet throttle-stop valves test travel switch acts not at 75% stroke, examination can be triggered in MEH control logics
Start timing when testing reset signal, i.e. low pressure main inlet throttle-stop valve stroke on-test, i.e., being closed by the stroke of main inlet throttle-stop valve 100% to 70% is needed
Time meets to send a pulse signal experiment reset signal OPNLPSVB, the signal to ETS switch boards；
7 ETS switch boards are connected to OPNLPSVB contract closure signal triggering R/PB-SVOP (L) actions；
7.1：After R/PB-SVOP (L) actions, power supply passes through R/PB-SVOP (L) contact and R/TT-1 contact 52/
SVOP (L) is acted, and it is powered to drive low pressure main inlet throttle-stop valve magnetic valve, starts to open low pressure main inlet throttle-stop valve；
7.2：After R/PB-SVOP (L) actions, normally closed contact disconnects so that R/PB-SVT (L) Z self-sustainings release；
8 33/SVOP (L) actions when low pressure main inlet throttle-stop valve opens foot, R/SVOP (L) normally closed contact disconnect so that R/SVT (L) is certainly
Protect and release；Experiment is completed.
It should be appreciated that the above-mentioned embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, without being construed as limiting the invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.In addition, appended claims purport of the present invention
Covering the whole changes fallen into scope and border or this scope and the equivalents on border and repairing
Change example.
Claims (2)
1. a kind of small turbine low pressure main inlet throttle-stop valve stroke experiment control system, it is characterised in that low pressure main inlet throttle-stop valve is by emergency trip
Protection system（ETS）And electrohydraulic control system（MEH）Control, the low pressure main inlet throttle-stop valve include standard-sized sheet travel switch, fully closed stroke
Travel switch at switch and 75% stroke, the reset of the switch board of the emergency trip protection system wait the normal of auxiliary reclay
Open contact portion power supply and open low pressure main inlet throttle-stop valve button loop, increase reset condition in the control logic of electrohydraulic control system,
The reset condition is when starting to test and close low pressure main inlet throttle-stop valve, increases a pulse signal, the pulse signal and low pressure main inlet throttle-stop valve
Logical "or" computing is made in test in place, and either condition meets, will close low pressure main inlet throttle-stop valve instruction preset, while with closing the main vapour of low pressure
Door instruction sends out the instruction of low pressure main inlet throttle-stop valve after delay disconnects progress logic "and" operation.
2. small turbine low pressure main inlet throttle-stop valve stroke experiment control system according to claim 1, it is characterised in that starting
When testing and closing low pressure main inlet throttle-stop valve, a pulse signal is sent after 5s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710950878.5A CN107560867B (en) | 2017-10-13 | 2017-10-13 | Small steam turbine low-pressure main valve stroke test control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710950878.5A CN107560867B (en) | 2017-10-13 | 2017-10-13 | Small steam turbine low-pressure main valve stroke test control system |
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| Publication Number | Publication Date |
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| CN107560867A true CN107560867A (en) | 2018-01-09 |
| CN107560867B CN107560867B (en) | 2020-08-07 |
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| CN201710950878.5A Active CN107560867B (en) | 2017-10-13 | 2017-10-13 | Small steam turbine low-pressure main valve stroke test control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896241A (en) * | 2020-09-09 | 2020-11-06 | 广州东方电力有限公司 | Method and device for testing partial stroke activity of steam turbine valve |
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Cited By (1)
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| CN111896241A (en) * | 2020-09-09 | 2020-11-06 | 广州东方电力有限公司 | Method and device for testing partial stroke activity of steam turbine valve |
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| CN107560867B (en) | 2020-08-07 |
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