CN2309001Y - One-chip computer field monitor for transformer substation - Google Patents
One-chip computer field monitor for transformer substation Download PDFInfo
- Publication number
- CN2309001Y CN2309001Y CN 97238596 CN97238596U CN2309001Y CN 2309001 Y CN2309001 Y CN 2309001Y CN 97238596 CN97238596 CN 97238596 CN 97238596 U CN97238596 U CN 97238596U CN 2309001 Y CN2309001 Y CN 2309001Y
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- chip microcomputer
- voltage signal
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- sampling resistor
- multiplexer
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Abstract
The utility model relates to a single chip computer field monitoring device for a transformer substation. The utility model has the structure that a sampling resistor 9 and a voltage division resistor 10 are respectively connected with linear rectifiers 11 and 12, and filtering amplitude limiters 13 and 14; the sampling resistor 9 and the voltage division resistor 10 are also connected with an A/D interface of a single chip computer 22 by a multi-path converter 17; one end of shaping and zero-crossing detectors 15 and 16 is respectively connected with the sampling resistor 9 or the voltage division resistor 10, and the other ends are respectively connected with an input interface of the single chip computer 22; optoelectronic isolators 18 and 19 are respectively connected with a switching output interface and a switching input interface of the single chip computer 22, an amplifier 20 is respectively connected with the optoelectronic isolator 19 and an outlet relay 21, then the amplifier 20, the optoelectronic isolator 19 and the outlet relay 21 are together sealed in a shielding box made of steel plates. In addition, the air in the shielding box is pumped out to form vacuum, or noble gas is filled in the shielding box. The utility model has the functions of protection, measurement and monitoring.
Description
The utility model relates near a kind of being installed in outdoor substation or the indoor transforming plant primary equipment scene, has transformer station's single-chip microcomputer on-site supervision device of measurement, supervision, protection, communication and breaking-closing operating function.
With the computer set control platform is that the computer monitoring system of transformer substation of representative is because its perfect in shape and function; fail safe, reliability height; operation, easy to maintenance; the telemechanical interface is arranged; can realize advantages such as transformer station is unattended; just progressively replace conventional electromagnetic type relaying protection and signal system, more and more used.But existing computer supervisory control system is not suitable for outdoor substation, again because its price is higher, also is not suitable for rural area transformer station and small-sized industrial and mineral transformer station.
The purpose of this utility model is; a kind of transformer station single-chip microcomputer on-site supervision device is provided; it is suitable for outdoor substation and indoor transformer station; can be to main transformer; primary equipment such as circuit breaker, on-load switch is measured, is monitored, protection and breaking-closing operating; and can will measure and supervisory signal is sent to the operational order that the host computer that is installed in transformer station's night shift room or central dispatching institute and reception and execution are sent through host computer.
The technical solution of the utility model is, it is by sampling resistor, divider resistance, linear rectifier, the filtering amplitude limiter, multiplexer, shaping and zero-crossing detector, photoisolator, amplifier, exit relay, single-chip microcomputer and vacuum shielding box are formed, its architectural feature is, ac current signal being changed into the sampling resistor of ac voltage signal is connected with the filtering amplitude limiter with the linear rectifier that ac voltage signal is become d. c. voltage signal, the filtering amplitude limiter is connected with the multiplexer that is used to expand analog signal channel again, multiplexer with d. c. voltage signal through A/D interface input single-chip microcomputer; The divider resistance that the ac voltage signal amplitude is reduced is connected with the filtering amplitude limiter with the linear rectifier that ac voltage signal is become d. c. voltage signal, the filtering amplitude limiter is connected with multiplexer again, and multiplexer is imported single-chip microcomputer with d. c. voltage signal through the A/D interface; Phase place and the shaping of a frequency and end of zero-crossing detector that detects ac current signal and ac voltage signal is connected with sampling resistor or divider resistance respectively, and the other end is connected with the input interface of the single-chip microcomputer of the phase place of evaluation ac current signal and ac voltage signal and frequency respectively; Prevent that the photoisolator that disturbs is connected with the input of single-chip microcomputer switching value, output interface, the amplifier that output signal is amplified is connected with the exit relay that drives operating mechanism with photoisolator respectively, then sampling resistor, divider resistance, linear rectifier, filtering amplitude limiter, multiplexer, shaping and zero-crossing detector, photoisolator, amplifier, exit relay, the single-chip microcomputer that connects is sealed in the shielding box of a steel plate system together, is evacuated to 10 in the box
-3～10
-4Millimetres of mercury, or in evacuated box, charge into pure, the inert gas of easily ionizable not.The turnover line of vacuum shielding box all passes through plug.
Another kind of technical scheme of the present utility model is, can use the micro-transformer of current with the ac current signal unsteady flow to replace described sampling resistor, uses the miniature voltage transformer with the ac voltage signal step-down to replace described divider resistance.
Engage accompanying drawing below protection of the present utility model, measurement and supervision principle are done detailed explanation.
Description of drawings: Fig. 1 is an outline drawing of the present utility model; Fig. 2 is used for the block diagram of protection of transforming plant main transformer depressor and monitoring for the utility model; Fig. 3 is used for the block diagram that transformer station feeds out route protection and monitoring for the utility model; Fig. 4, Fig. 5, Fig. 6 are electrical principle component of the present utility model; Fig. 7 is the electrical principle component location drawing; Fig. 8 is the main wiring diagram of embodiment of the present utility model, wherein:
1-vacuum shielding box, 2-plug, 3-operating mechanism, 4-temperature signal meter, 5-blower fan relay, the 6-Buchholz relay, 7-current transformer, 8-voltage transformer, 9-sampling resistor, the 10-divider resistance, 11,12-linear rectifier, 13,14-filtering amplitude limiter, 15,16-shaping and zero-crossing detector, 17-multiplexer, 18,19-photoisolator, 20-amplifier, 21-exit relay, the 22-single-chip microcomputer, the shared developing engine keyboard of 23-, 24-common user communication processor, 25-host computer.
Fig. 2 is used for the block diagram of the protection and the monitoring of transforming plant main transformer depressor for the utility model.For the main body protection of transformer, as temperature protection, air-cooled protection, protection etc. all are to implement with the form of switching value; And for phase fault, the turn-to-turn short circuit of Transformer Winding, faults such as single-line to ground fault, overload, then electric current, the voltage variation in various degree with transformer shows, and for both of these case, the utility model is implemented protection respectively.In order to implement main body protection, temperature signal meter 4, blower fan relay 5, the switching value signal of outputs such as Buchholz relay 6 enters single-chip microcomputer 22 through jamproof photoisolator 18, compare with the switching value address of single-chip microcomputer storage, as belong to oily temperature rise, blower fan stall, light gas action etc., then alarm signal is reached host computer 25 through common user communication processor 24; As the gas action of attaching most importance to, then single-chip microcomputer 22 sends trip command immediately, after photoisolator 19 outputs and amplifier 20 amplifications, makes exit relay 21 actions, drives operating mechanism 3 tripping operations, sends signal to host computer 25 simultaneously.
When various short troubles and overload take place in transformer, the ac current signal of the reflection fault of being gathered by current transformer 7 at first is converted to ac voltage signal by sampling resistor 9, the ac voltage signal of the same reflection fault of being gathered by voltage transformer 8 is at first by divider resistance 10 step-downs, two groups of ac voltage signals are respectively through linear rectifier 11 then, 12 and filtering amplitude limiter 13,14 rectifications and filtering, become d. c. voltage signal, enter single-chip microcomputer 22 through multiplexer 17 again, after the A/D conversion, compare with each setting value of single-chip microcomputer storage, as surpassing relevant setting value, through photoisolator 19, trip command is sent in the instantaneous or time-delay of amplifier 20 and exit relay 21, and sends signal to host computer simultaneously.
Adopting multiplexer is the measure of taking under the not enough situation of single-chip simulation passage.
The utility model also can and feed out circuit etc. to power capacitor group, the bus of transformer station and implement protection, and Fig. 3 is used for the block diagram that transformer station feeds out route protection and monitoring for the utility model.The utility model is installed in and feeds out proximity to circuit breakers, and the opening and closing state of circuit breaker operation mechanism 3 enters single-chip microcomputer through photoisolator 18 and switch value input interface, and is sent to host computer.When various short circuits or earth fault or overload take place in circuit, be installed in the current transformer 7 of proximity to circuit breakers and the alternating current and the ac voltage signal of the reflection fault that voltage transformer 8 is gathered, at first be converted to ac voltage signal and step-down, again through rectification, filtering becomes d. c. voltage signal and enters single-chip microcomputer, after the A/D conversion, compare with each setting value of single-chip microcomputer storage, according to a certain setting value that surpasses, single-chip microcomputer is through photoisolator 19, trip command is sent in the instantaneous or time-delay of amplifier 20 and exit relay 21, and upwards lives machine 25 simultaneously and send signal.
Transformer station's night shift room or central dispatching can also be by host computer and the utility model to the power equipment of transformer station with feed out circuit and carry out real time monitoring, measurement and remote control.Gather by current transformer 7 and voltage transformer 8; reflect every power equipment; the alternating current and the ac voltage signal of every feeder line normal condition and operation conditions; through changing d. c. voltage signal and A/D conversion into; with through shaping and zero-crossing detector 15; 16 detect; identify phase place and frequency by single-chip microcomputer 22; the individual device that will reflect the substation operation situation then through common user communication processor 24; the electric current of each bar circuit; the frequency of voltage; phase place and amplitude are sent to host computer 25 with digital form; show electric current for host computer; voltage; frequency; phase place; calculate active power; reactive power; power factor; active electrical degree; idle electric degree etc., and can carry out breaking-closing operating by host computer; protection is patrolled and examined; the diagnosis of equipment normal condition; print statistical report form and operation order etc.
Can write or revise electric current, voltage protection setting value to single-chip microcomputer 22 of the present utility model with shared developing engine keyboard 23 or host computer 25.
Working power of the present utility model can be provided by the direct current or the alternating current operation power supply of transformer station.
The general corresponding power equipment of the utility model, i.e. protection one to one.For important power equipment, as main transformer and important supply line, also can take two pairs one protections, promptly two identical the utility model of setting value stand-by heat is each other protected same power equipment.Real time execution wherein, another part is in monitored state, when unrecoverable failure appears in of work, automaticallyes switch immediately, is taken over job by another part, can change under the situation that does not stop protected equipment operation for one that breaks down.
From the above, the advantage of the existing existing computer monitoring system of transformer substation of the utility model also has important advantages:
1, reliable operation.All electronics of the present utility model, electric elements all are sealed in the worn-out box of screen of a steel plate system, have completely cut off electromagnetic interference; The subenvironment of inert gas high vacuum or clean does not have dust and condensation phenomenon in the box, makes electronics not have part and single-chip microcomputer working stability, reliable; Because of being in high vacuum or the inert gas environment,, making the prolongation of contact life-span and eliminated the influence of electric arc electronic circuit so exit relay contact branch, fashionablely can not produce electric spark and electricity is lonely.
2, cost is lower.The utility model has replaced the more expensive various electric parameters transducers of price with the lower sampling resistor of price, divider resistance, linear rectifier, filtering amplitude limiter, shaping and zero-crossing detector, as electric current, voltage, power factor, power transducer etc., and the volume of device is dwindled greatly, so cost is lower.
3, easy for installation, mounting cost is low.The utility model is connected with external equipment by plug, easily.The utility model is installed near outdoor or the indoor power equipment, wiring is apart from weak point, by a telecommunication cable with after shared communication processor is connected, just can be to transformer station's night shift room or measurement that central dispatching sends, supervisory signal and reception instruction, compare with conventional substation, significantly reduced required cable and installation workload.
4, maintenance workload is little, and the dilatation performance is good.Be used to protect the utility model of various power equipments and power circuit, except that address code with setting value is different, structure is identical, when unrecoverable failure appears in a certain the utility model, is easy to replace with another part.
When transformer station need expand capacity, increase equipment and when feeding out circuit, it is novel to adopt several these reality to do, and is connected with operating mechanism, instrument transformer etc. by its plug, just can be to increasing power equipment newly and feeding out circuit protection, measure and monitor.
The utility model adapts in the open fully works in the environment, therefore can be applicable to outdoor substation;
The utility model also can be applicable to newly-built indoor transformer station, or is used for the transformer station that adopts conventional electromagnetic type relaying protection is transformed.
Illustrate enforcement of the present utility model below.
Fig. 8 is the main wiring diagram of certain indoor transformer station of 35KV, this transformer station's single loop inlet wire, and not segmentation of bus has 8 the tunnel to feed out the loop.
Requirement for the main transformer of this transformer station is: when the winding phase fault takes place, and when turn-to-turn short circuit and lead-out wire phase fault, the moment tripping operation of both sides circuit breaker; When causing overcurrent, should trip the inverse time lag owing to outside phase fault; When overload, oily temperature rise, cooling blower fault, light gas action etc., should send alarm signal or delay tripping.
The requirement that feeds out circuit is: should instantaneous tripping operation during phase fault, and when ground short circuit and neutral point overvoltage, should report to the police and definite time-lag tripping operation; Overload should be reported to the police.
Requirement to Shunt Capacitor Unit is: when overcurrent, internal connection line short circuit and bus loss of pressure, and should instantaneous tripping operation.
The utility model can satisfy above-mentioned protection requirement fully.The utility model that is used for this transformer station adopts 8798 single-chip microcomputers, in each position that feeds out switch cubicle and the former installation relay of capacitor panel a utility model is installed, and is used to feed out measurement, supervision and the protection of circuit and capacitor group; At the proximity to circuit breakers of transformer both sides the utility model 1AC and 2AC are installed respectively; wherein 1AC finishes main transformer protection, instrumentation and function such as communicate by letter with host computer; 2AC is both as the backup protection of 10KV side; again with 1AC stand-by heat each other; when expendable fault appears in 1AC; automatically switch the protection of undertaking main transformer by 2AC immediately.This transformer station adopts 11 the utility model altogether, jointly set up by the microprocessor of a band RS-232 or RS-485 communication interface and transformer station's night shift room or central dispatching host computer between write to each other.
Claims (4)
1. transformer station's single-chip microcomputer on-site supervision device, it is by sampling resistor 9, divider resistance 10, linear rectifier 11,12, filtering amplitude limiter 13,14, shaping and zero-crossing detector 15,16, multiplexer 17, photoisolator 18,19, amplifier 20, exit relay 21, single-chip microcomputer 22, vacuum shielding box 1 is formed, it is characterized in that, describedly ac current signal is changed into the sampling resistor 9 of ac voltage signal be connected with filtering amplitude limiter 13 with the linear rectifier 11 that ac voltage signal is become d. c. voltage signal, filtering amplitude limiter 13 is connected with the multiplexer 17 that is used to expand analog signal channel again, multiplexer 17 is imported single-chip microcomputer with d. c. voltage signal through the A/D interface, the divider resistance 10 that the ac voltage signal amplitude is reduced is connected with filtering amplitude limiter 14 with the linear rectifier 12 that ac voltage signal is become d. c. voltage signal, filtering amplitude limiter 14 is connected with multiplexer 17 again, multiplexer 17 is imported single-chip microcomputer with d. c. voltage signal through the A/D interface, detect ac current signal and the phase place of ac voltage signal and the shaping and the zero-crossing detector 15 of frequency, an end of 16 is connected with sampling resistor 9 or divider resistance 10 respectively, the other end is connected with the input interface of the single-chip microcomputer 22 of the phase place of identifying ac current signal and ac voltage signal and frequency respectively, prevent the optical isolator 18 that disturbs, 19 with the input of the switching value of single-chip microcomputer 22, output interface connects, the amplifier 20 that output signal is amplified is connected with operate machine 3 exit relay 21 of photoisolator 19 and driving respectively, then with the sampling resistor 9 that connects, divider resistance 10, linear rectifier 11,12, filtering amplitude limiter 13,14, shaping and zero-crossing detector 15,16, multiplexer 17, photoisolator 18,19, amplifier 20, exit relay 21, single-chip microcomputer 22 is sealed in the vacuum shielding box 1 together, vacuumizes in the box.
2. the described transformer station of claim 1 single-chip microcomputer on-site supervision device, its feature also is, can use micro-transformer of current to replace described sampling resistor 9, use miniature voltage transformer to replace described divider resistance 10 the ac voltage signal step-down with the ac current signal unsteady flow.
3. the described transformer station of claim 1 single-chip microcomputer on-site supervision device, its feature also are, can be filled with inert gas in the vacuum shielding box 1.
4. the described transformer station of claim 1 single-chip microcomputer on-site supervision device, its feature is that also the turnover line of vacuum shielding box 1 is all by plug 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97238596 CN2309001Y (en) | 1997-07-24 | 1997-07-24 | One-chip computer field monitor for transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97238596 CN2309001Y (en) | 1997-07-24 | 1997-07-24 | One-chip computer field monitor for transformer substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2309001Y true CN2309001Y (en) | 1999-02-24 |
Family
ID=33948880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97238596 Expired - Fee Related CN2309001Y (en) | 1997-07-24 | 1997-07-24 | One-chip computer field monitor for transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2309001Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025132A (en) * | 2010-12-18 | 2011-04-20 | 王艳辉 | Temperature and humidity protective circuit of switch cabinet |
| CN102818309A (en) * | 2011-06-07 | 2012-12-12 | 沈阳理工大学 | Heat transfer station monitoring recording device based on accumulator read-in module (ARM) |
| CN103268108A (en) * | 2013-05-17 | 2013-08-28 | 郑州华力信息技术有限公司 | Intelligent transformer load management system |
| CN104659760A (en) * | 2014-06-19 | 2015-05-27 | 吴春刚 | Method for realizing automatic comprehensive protection of transformer substation |
| CN107728005A (en) * | 2017-10-20 | 2018-02-23 | 许继电气股份有限公司 | A kind of fault recognition method and device of HVDC divider |
| WO2018072130A1 (en) * | 2016-10-19 | 2018-04-26 | 姚娟 | Low-voltage switchgear having reliable operation |
| CN109655661A (en) * | 2019-02-21 | 2019-04-19 | 广东电网有限责任公司 | The voltage check device and method of substation |
-
1997
- 1997-07-24 CN CN 97238596 patent/CN2309001Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025132A (en) * | 2010-12-18 | 2011-04-20 | 王艳辉 | Temperature and humidity protective circuit of switch cabinet |
| CN102818309A (en) * | 2011-06-07 | 2012-12-12 | 沈阳理工大学 | Heat transfer station monitoring recording device based on accumulator read-in module (ARM) |
| CN103268108A (en) * | 2013-05-17 | 2013-08-28 | 郑州华力信息技术有限公司 | Intelligent transformer load management system |
| CN103268108B (en) * | 2013-05-17 | 2016-08-03 | 国家电网公司 | Intelligent load management system for transformer |
| CN104659760A (en) * | 2014-06-19 | 2015-05-27 | 吴春刚 | Method for realizing automatic comprehensive protection of transformer substation |
| WO2018072130A1 (en) * | 2016-10-19 | 2018-04-26 | 姚娟 | Low-voltage switchgear having reliable operation |
| CN107728005A (en) * | 2017-10-20 | 2018-02-23 | 许继电气股份有限公司 | A kind of fault recognition method and device of HVDC divider |
| CN107728005B (en) * | 2017-10-20 | 2020-06-16 | 许继电气股份有限公司 | Fault identification method and device of high-voltage direct-current voltage divider |
| CN109655661A (en) * | 2019-02-21 | 2019-04-19 | 广东电网有限责任公司 | The voltage check device and method of substation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |