CN103472750A - Automatic control system of power transformer cooler - Google Patents
Automatic control system of power transformer cooler Download PDFInfo
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- CN103472750A CN103472750A CN201310420648XA CN201310420648A CN103472750A CN 103472750 A CN103472750 A CN 103472750A CN 201310420648X A CN201310420648X A CN 201310420648XA CN 201310420648 A CN201310420648 A CN 201310420648A CN 103472750 A CN103472750 A CN 103472750A
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Abstract
The invention discloses an automatic control system of a power transformer cooler and belongs to the power field. The automatic control system of the power transformer cooler is composed of a temperature signal collecting and processing module, an integrated switching module, a circulation switching module, a fault detection processing module and an input and output control module, wherein the temperature signal collecting and processing module, the integrated switching module, the circulation switching module, the fault detection processing module and the input and output control module are connected with a control module in a signal mode. The power transformer cooler automatic control system can monitor and control the oil temperature of a transformer, grouping switching of a transformer cooler is achieved according to different oil temperatures, service life of the cooler is prolonged, and good economic significance is achieved. Information of various conditions, such as the oil temperature, fan switching, and faults, of a cooling system is uploaded, so that a man on duty and a dispatcher master the conditions at any time.
Description
Technical field
The present invention relates to power domain, particularly a kind of power transformer refrigeratory automatic control system.
Background technology
The basic structural components of power transformer is comprised of iron core, winding and insulation.Meanwhile, in order to guarantee the safe operation of power transformer, also be equiped with fuel tank, cooling device and protective device.The cooling device of transformer is that the transformer dissipation of heat produced by loss that is in operation is gone out, to guarantee that transformer can move safely normally.
The type of cooling of transformer has following several: (1) natural wind is cooling; (2) forced oil-circulation wind is cooling; (3) forced oil circulation water-cooling but; (4) forced oil-circulation Directed cooling.
In recent years, single-chip microcomputer or the cooling control system of PLC mode, the transformer cooling control system of converter technique appear again adopting.
In realizing process of the present invention, the inventor finds that at least there is following problem in prior art:
The main drawback that traditional transformer cooling control device exists is: (1) refrigeratory control loop exists certain design defect; (2) hard contact of temperature is controlled and is caused the frequent start-stop of refrigeratory; (3) operation that cooler package is set, auxiliary, standby, stop four kinds of stationary states and can not adjust online; (4) the relay switch is higher because of the corrosion and ageing failure rate; (5) can't with the dispatching automation communication, although or can transmit information, because transmission error makes the information of transmission become nonsensical very greatly.
Summary of the invention
In order to solve the problem of prior art, the embodiment of the present invention provides a kind of power transformer refrigeratory automatic control system.Described technical scheme is as follows:
The invention provides a kind of power transformer refrigeratory automatic control system, described power transformer refrigeratory automatic control system is comprised of the temperature signal collection processing module be connected with the control module signal, comprehensive switching module, switching cycle module, fault detect processing module, input/output control module.
Particularly, described control module comprises controller, and AT89C51 single-chip microcomputer, TLC1543 A/D converter, keyboard control chip, output module, communication module and automatic reset circuit that described controller is connected by signal form.
Particularly, described AT89C51 single-chip microcomputer is a kind of low-power consumption that Atmel company produces, high performance 8 single-chip microcomputers; Single-chip microcomputer is mainly used in controlling purpose, and the monitor control system require formed has in real time, external echo fast, can collect rapidly mass data, realizes being controlled parameter adjustment and the control of object after making logic judgement and reasoning.
Particularly, described TLC1543 A/D converter is numerous serial a/d converters that American TI Company is produced.
Particularly, described keyboard control chip is 16 LED charactron monitor keyboard interface special integrated circuit BC7281.
Particularly, " house dog " that described automatic reset circuit is the production of U.S. DALLAS company be integrated circuit DS1232 (WATCHDOG).
Particularly, described temperature signal collection processing module comprises temperature controller, and described temperature controller comprises sensor, the transmitter that platinum electrode, signal connect.
Particularly, at first described comprehensive switching module determines the cooler package number that move according to transformer load size of current and top-oil temperature, then by the switching cycle module, according to the cooler package Cumulative Elapsed Time, determines concrete which group refrigeratory that starts.
Particularly, described switching cycle module, according to statistics and sequence to each cooler package Cumulative Elapsed Time, in conjunction with running status zone bit and fault flag, takes turns to operate cooler package, the balanced use.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Native system can monitor and control temperature of oil in transformer, has realized the grouping switching of transformer cooler according to different oil temperatures, has extended the serviceable life of refrigeratory, and economic implications is preferably arranged; Realized the various situations of cooling system, as uploading of the information such as oil temperature, fan switching and fault, be convenient to person on duty, yardman and grasp at any time situation.
The accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structured flowchart of the power transformer refrigeratory automatic control system that provides of the embodiment of the present invention;
Fig. 2 is the structured flowchart of the controller that provides of the embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment
The embodiment of the present invention provides a kind of power transformer refrigeratory automatic control system, referring to Fig. 1, described power transformer refrigeratory automatic control system is comprised of the temperature signal collection processing module be connected with the control module signal, comprehensive switching module, switching cycle module, fault detect processing module, input/output control module.
Particularly, referring to Fig. 2, control module comprises controller, AT89C51 single-chip microcomputer, TLC1543A/D converter, keyboard control chip, output module, communication module and automatic reset circuit that this controller is connected by signal form, wherein single-chip microcomputer is the core of controller, and A/D converter is that input signal is converted to digital signal.
Further, the AT89C51 single-chip microcomputer is a kind of low-power consumption that Atmel company produces, high performance 8 single-chip microcomputers, flash programmable read only memory with 8k, it adopts the high density of Atmel company to be difficult for the memory technology of losing, and and the 80c51 of industrial standard and the instruction set pinouts compatibility of 80c52, its integrated flash allows programmable storage to carry out reprogramming in system or general non-volatile memory program.AT89C51 the is integrated CPU of 8, the flash of 8K.The RAM of 256 bytes, the I/O bus of 32.The timer/counter of three 16 bytes, two-stage six middle section structures, the serial port of a full duplex, oscillator and clock circuit.AT89C5l is the core that data are processed and system is controlled of completion system, and all other devices all are subject to its control or serve for it.The AT89C51 single-chip microcomputer is mainly used in controlling purpose, and the monitor control system require formed has in real time, external echo fast, can collect rapidly mass data, realizes being controlled parameter adjustment and the control of object after making logic judgement and reasoning.The developing direction of single-chip microcomputer present stage be take 8 as main 32 as auxiliary, target is high-performance, high reliability, low-voltage, low-power consumption, low noise and low cost.
Further, the TLC1543 A/D converter is a kind of in numerous serial a/d converters of producing of American TI Company, it has, and input channel is many, conversion accuracy is high, transmission speed is fast, use the advantages such as flexible and cheap, is a kind of analog to digital converter of high sexual valence.TLC1543 is CMOS, 10 bit switch electric capacity gradually-appoximant analog-digital converters.It has three input ends and 3 a state output terminal: sheet choosing (CS), I/O clock (I/OCLOCK), address input (ADRESS) and data outputs (DATAOUT).
Further, keyboard control chip is BC7281, and BC7281 is 16 LED charactron monitor keyboard interface special integrated circuits, and by external shift register, (typical chip is as 74HC164,74LS595 etc.), but at most ant controls that 16 charactrons show or 128 LED independently.It is controlled that the driver output polarity of BC7281 and output timing are software, thereby can hinder with various external circuits, joins platform, is applicable to the charactron of any size.
Further, " house dog " that automatic reset circuit is the production of U.S. DALLAS company be integrated circuit DS1232 (WATCHDOG), it has dependable performance, uses simple, cheap characteristics, is applied in the antijamming capability that can be good at improving hardware in the single-chip microcomputer product.
Particularly, the temperature signal collection processing module comprises temperature controller, and this temperature controller comprises sensor, the transmitter that platinum electrode, signal connect.Signal through temperature controller output enters transmitter, transmitter is sent the current signal of a 4-20 milliampere, then this current signal is realized to the conversion of current and voltage signals by the resistive element on control chip, voltage after conversion is at the 0.4-2(volt) between, then this voltage signal is input to the TLC1543 digital to analog converter, carries out the signal processing.
Particularly, at first comprehensive switching module determines the cooler package number that move according to transformer load size of current and top-oil temperature, then by the switching cycle module, according to the cooler package Cumulative Elapsed Time, determines concrete which group refrigeratory that starts.
Particularly, the switching cycle module, according to statistics and sequence to each cooler package Cumulative Elapsed Time, in conjunction with running status zone bit and fault flag, takes turns to operate cooler package, the balanced use.
At first, native system, from Temperature Measurement System for Transformer extracted current (4-20mA), then becomes voltage (04V-2V) by current/voltage conversion, then is input to TLC1543 and carries out analog to digital conversion, be analog-signal transitions digital signal, be input to single chip computer AT 89C51.We can be arranged temperature simultaneously, by the setting parameter button, can adjust various temperature parameters.We will establish best temperature and deposit EEPROM (24C02) in by single-chip microcomputer, like this, when system power failure, or while breaking down system restart, the parameter constant arranged before can keeping, thus guaranteed the reliable and stable operation of system.In the operational process of system, also can be arranged various temperature parameters, the parameter of setting send EEPROM to preserve simultaneously, and simultaneity factor is carried out work by new temperature parameter.
Single-chip microcomputer, by detecting voltage input signal, converts the temperature that corresponding numeral shows to, delivers to LED
Carry out the temperature demonstration, when transformer temperature reaches start-up temperature (as 45 degree), single-chip microcomputer sends control signal, makes to control the solid switch conducting of first group of fan, and first group of fan of transformer brings into operation, and its corresponding relay indicating light brightens.When temperature continues to be elevated to full startup value (as 55 degree), second group of fan puts into operation, and its corresponding pilot lamp brightens simultaneously.
When transformer temperature is reduced to second group of fan and stops value (as 50 degree), single-chip microcomputer sends controls letter
Number, the thyristor of controlling second group of fan is turn-offed, second group of fan is out of service, and its corresponding relay indicating light is dimmed simultaneously.When temperature continues to be reduced to the old full cut-off definite value of anus (as 40 degree), corresponding first group of fan is out of service, and its corresponding signal lamp is dimmed.
When temperature surpasses early warning temperature (as 75 degree), single-chip microcomputer sends control signal, makes on the one hand pre-
Warning lamp starts to brighten, and hummer starts to send chimes of doom off and on simultaneously.
Temperature continues to raise, and while surpassing the alarm temperature, single-chip microcomputer sends control signal, and alarm lamp starts flicker,
Hummer sends continuous chimes of doom simultaneously.
In this control system, when transformer oil temperature is in one group of fan stoppage in transit interval, only have first group of fan in operation, not waiting of lower every group of fan work time, may make the aging speed of first group of fan faster than second group of fan under the circumstances, so we wish that the wheel that can realize during this period two groups of fans changes jobs, for this reason, software systems are regularly changed fan, and the time is decided to be 2-4 hour, and the concrete time is selected by the user.Can extend the serviceable life of transformer like this.
In the process of operation, if, because the situation that the program operation flies or crashes appears in interference or other reason, watchdog circuit can be resetted automatically, and, by again reading the setting in EEPROM, make the system fork continue operation according to original state.
Native system is at first by the temperature collecting device of transformer, temperature to transformer is gathered, then send into the Temperature Treatment module and processed, then enter analog-digital commutator the analog information after processing is changed, become the digital signal amount that can carry out computing and processing for microprocessor.Microprocessor is by reading the information such as master data of current state of a control information (manual control or control automatically) and corresponding temperature control parameter setting and storage, carry out corresponding control algorithm with the transformer temperature information after analog-digital commutator is processed, result is controlled in output, and give corresponding output device by output control circuit, i.e. temperature display device, status display apparatus, audible alarm equipment.And driving circuit drives accordingly work after receiving the steering order of microcontroller, so that cooling device carries out cooling work or quits work according to program.Microprocessor is kept at the running parameter setting of system in storer, can call at any time when work, and can store for a long time.The staff also can be by the mode of manual intervention, and the direct command system is lowered the temperature and operated or stop by force the cooling of transformer is operated transformer by force.This can realize by the switching of automatic operation mode and manual working mode.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
The function that native system is realized mainly contains:
(1) can realize that the monitoring of transformer temperature and numeral show.
(2) take transformer load electric current, top-oil temperature is foundation, realizes transformer cooler component group switching,
Guarantee the oil temperature control of Transformer, and can accurately monitor the information such as temperature of oil in transformer, refrigeratory operating condition.
(3) circular flow of cooler package.According to the Cumulative Elapsed Time of every group of refrigeratory, the balanced fortune of distributing
Line time, make cooler package circular flow, avoids by auxiliary, work, standby grouping, and each organizes serious unbalanced phenomenon working time.
(4) operational factor such as temperature can be adjusted online by button.
(5) solid-state relay, as executive component, is controlled oncontacting and is revealed.
(6) by detecting the cooler package current/voltage, realize the guarantors such as phase shortage, short circuit, overload, power phase shortage
Protect, and can show Cooler Fault, report to the police.
(7) transformer overtemperature, refrigeratory full cut-off match with tranformer protection, send alerting signal.
(8) communicate by letter with Supervisory Control System for Substation, upload the information such as temperature of oil in transformer, Cooler Fault.
Native system can monitor and control temperature of oil in transformer, has realized the grouping switching of transformer cooler according to different oil temperatures, has extended the serviceable life of refrigeratory, and economic implications is preferably arranged; Realized the various situations of cooling system, as uploading of the information such as oil temperature, fan switching and fault, be convenient to person on duty, yardman and grasp at any time situation.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a power transformer refrigeratory automatic control system, it is characterized in that, described power transformer refrigeratory automatic control system is comprised of the temperature signal collection processing module be connected with the control module signal, comprehensive switching module, switching cycle module, fault detect processing module, input/output control module.
2. power transformer refrigeratory automatic control system according to claim 1, it is characterized in that, described control module comprises controller, and AT89C51 single-chip microcomputer, TLC1543 A/D converter, keyboard control chip, output module, communication module and automatic reset circuit that described controller is connected by signal form.
3. power transformer refrigeratory automatic control system according to claim 2, is characterized in that, described AT89C51 single-chip microcomputer is a kind of low-power consumption that Atmel company produces, high performance 8 single-chip microcomputers; Single-chip microcomputer is mainly used in controlling purpose, and the monitor control system require formed has in real time, external echo fast, can collect rapidly mass data, realizes being controlled parameter adjustment and the control of object after making logic judgement and reasoning.
4. power transformer refrigeratory automatic control system according to claim 2, is characterized in that, described TLC1543 A/D converter is numerous serial a/d converters that American TI Company is produced.
5. power transformer refrigeratory automatic control system according to claim 2, is characterized in that, described keyboard control chip is 16 LED charactron monitor keyboard interface special integrated circuit BC7281.
6. power transformer refrigeratory automatic control system according to claim 2, is characterized in that, " house dog " that described automatic reset circuit is the production of U.S. DALLAS company be integrated circuit DS1232 (WATCHDOG).
7. power transformer refrigeratory automatic control system according to claim 1, is characterized in that, described temperature signal collection processing module comprises temperature controller, and described temperature controller comprises sensor, the transmitter that platinum electrode, signal connect.
8. power transformer refrigeratory automatic control system according to claim 1, it is characterized in that, at first described comprehensive switching module determines the cooler package number that move according to transformer load size of current and top-oil temperature, then by the switching cycle module, according to the cooler package Cumulative Elapsed Time, determines concrete which group refrigeratory that starts.
9. power transformer refrigeratory automatic control system according to claim 1, it is characterized in that, described switching cycle module is according to statistics and sequence to each cooler package Cumulative Elapsed Time, in conjunction with running status zone bit and fault flag, cooler package is taken turns to operate, the balanced use.
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| CN201310420648XA CN103472750A (en) | 2013-09-16 | 2013-09-16 | Automatic control system of power transformer cooler |
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| CN201310420648XA CN103472750A (en) | 2013-09-16 | 2013-09-16 | Automatic control system of power transformer cooler |
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Cited By (2)
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| CN104678842A (en) * | 2015-01-22 | 2015-06-03 | 深圳市新格林耐特通信技术有限公司 | System and method for extending application of broadcom exchange chip |
| CN110021470A (en) * | 2019-04-08 | 2019-07-16 | 广东瑞智电力科技有限公司 | Transformer safety control system and its control method |
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Effective date of registration: 20131128 Address after: 100031, Power Grid Corp, 86 West Changan Avenue, Beijing, Xicheng District Applicant after: State Grid Corporation of China Applicant after: Jiaozuo Power Supply Company of State Grid Henan Electric Power Company Address before: 454150 No. 299 South Tower Road, Henan, Jiaozuo Applicant before: Jiaozuo Power Supply Company of State Grid Henan Electric Power Company |
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Application publication date: 20131225 |