CN103389672A - Comprehensive and intelligent controller of transformer cooling system and transformer cooling system control method of controller - Google Patents
Comprehensive and intelligent controller of transformer cooling system and transformer cooling system control method of controller Download PDFInfo
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- CN103389672A CN103389672A CN2013103297994A CN201310329799A CN103389672A CN 103389672 A CN103389672 A CN 103389672A CN 2013103297994 A CN2013103297994 A CN 2013103297994A CN 201310329799 A CN201310329799 A CN 201310329799A CN 103389672 A CN103389672 A CN 103389672A
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Abstract
The invention discloses a comprehensive and intelligent controller of a transformer cooling system and a transformer cooling system control method of the controller, relates to comprehensive and intelligent control techniques of power transformer cooling systems, and aims to solve problems that a conventional power transformer cooling system requires manual control, is low in degree of automation and lacks necessary protection. According to the control method, the number of groups of fans required to be started is determined according to oil temperatures of different transformers, and the higher the oil temperatures are, the more groups of the fans are started; when the oil temperatures of the transformers are detected to be equal for successive two times, a single chip circuit controls the fans to work in turns through a fan control circuit; when current of an oil pump or a fan group is higher than a preset value, a power supply of the oil pump or the fan group is switched off, and simultaneously, a fault alarming circuit sends a warning message; and the whole work process realizes automatic control, and the controller has the motor protection function, so that the fans can be protected from burnout. The controller and the control method are applicable to cooling control of a large power transformer.
Description
Technical field
The present invention relates to power transformer cooling system comprehensive intelligent control technology, belong to the intelligent grid field.
Background technology
In electric system, power transformer is one of important electrical equipment.Large-scale power transformer oil overheating problem is the major issue that operation and manufacturing sector all extremely paid close attention to and needed solution.For guaranteeing the continuous safe power supply of transformer, the maximization in life-span, transformer must guarantee to move in certain temperature range.The cooling system control apparatus of transformer, mostly adopt traditional Control pattern at present, drives the coil of A.C. contactor by the switching of operations staff's manual control mechanical contact, and connect the work loop of refrigeratory.This mode has a lot of shortcomings, and is as low in automaticity, lacks necessary protection, and blower fan the group start simultaneously, and electric current is excessive etc.Along with unattended operation transformer station is universal,, because scene does not have the operations staff, can not in time throw and stop refrigeratory, make the temperature difference amplitude of transformer when peak and low ebb load large, accelerate Transformer Insulation Aging, cause the leakage of oil of seal member.
Summary of the invention
The objective of the invention is needs in order to solve present large-scale power transformer cooling system the problem that manual control, automaticity are low, lack necessary protection, and the transformer cooling system control method of a kind of transformer cooling system integrated intelligent controller and this controller is provided.
transformer cooling system integrated intelligent controller of the present invention comprises temperature sensing circuit 1, current detection circuit 2, the first A/D converter 3, the second A/D converter 4, single chip circuit 6, draught fan control circuit 10 and motor protective circuit 13, described temperature sensing circuit 1 is for detection of temperature of oil in transformer, the temperature signal output terminal of described temperature sensing circuit 1 connects the signal input part of the first A/D converter 3, the signal output part of described the first A/D converter 3 connects the temperature signal input end of single chip circuit 6, current detection circuit 2 is for detection of the input current of the blower fan in transformer cooling system or oil-immersed pump, the current signal output end of described current detection circuit 2 connects the signal input part of the second A/D converter 4, the signal output part of the second A/D converter 4 connects the current signal input end of single chip circuit 6, the control signal input end of the air-blower control signal output part connecting fan control circuit 10 of described single chip circuit 6, the protection control signal output terminal of single chip circuit 6 connects the control signal input end of motor protective circuit 13.
transformer cooling system integrated intelligent controller of the present invention also comprises the first tri-state gate circuit 5, the second tri-state gate circuit 7 and expansion port circuit 8, the signal output part of the first A/D converter 3 connects the temperature signal input end of single chip circuit 6 by the first tri-state gate circuit 5, the signal output part of the second A/D converter 4 connects the current signal input end of single chip circuit 6 by the first tri-state gate circuit 5, the data bus of single chip circuit 6 is connected with the data bus of expansion port circuit 8 by the second tri-state gate circuit 7, the air-blower control signal output part of single chip circuit 6 is by the control signal input end of the second tri-state gate circuit 7 and expansion port circuit 8 connecting fan control circuits 10.
Transformer cooling system integrated intelligent controller of the present invention also comprises digital display circuit 9, and the display control signal input end of described digital display circuit 9 connects the display control signal output terminal of expansion port circuit 8.
Transformer cooling system integrated intelligent controller of the present invention also comprises working indicating 11, and the indication control signal input end of described working indicating 11 connects the indication control signal output terminal of expansion port circuit 8.
Transformer cooling system integrated intelligent controller of the present invention also comprises failure alarm circuit 12, and the control signal input end of described failure alarm circuit 12 connects the alarm control signal output terminal of single chip circuit 6.
The temperature sensing circuit 1 of transformer cooling system integrated intelligent controller of the present invention adopts the integrated two ends of AD590 type monolithic temperature-sensitive current source to realize.
The single chip circuit 6 of transformer cooling system integrated intelligent controller of the present invention adopts AT89C51 type chip microcontroller.
The current detection circuit 2 of transformer cooling system integrated intelligent controller of the present invention adopts a straight-through current transformer to realize.
The draught fan control circuit 10 of transformer cooling system integrated intelligent controller of the present invention adopts the SSR solid-state relay to realize.
The transformer cooling system control method of transformer cooling system integrated intelligent controller of the present invention realizes by following steps:
Gather the current acquisition step of the current signal of current detection circuit 2 transmissions;
Whether judge described current signal higher than preset value, and, judgment result is that actuating motor protection step while being, return to the electric current determining step of carrying out the temperature acquisition step when the determination result is NO;
Send the electric motor protecting step of electric motor protecting signal to motor protective circuit 13;
The temperature acquisition step of the temperature signal that collecting temperature testing circuit 1 sends; The recording step of this temperature signal of executive logging after this step finishes; Carry out temperature comparison step after this recording step finishes, also carry out simultaneously temperature determining step one;
Be used for the temperature signal that temperature signal that recording step relatively records and a front recording step record, and at comparative result, carry out the blower fan shift step while being identical, return to the temperature comparison step of execution current acquisition step at comparative result when not identical;
Send the blower fan shift step of rotation signal fan control circuit 10;
Judge whether described temperature signal equals 35 ℃, and carry out one group of air-blower control step judgment result is that while being, carry out the temperature determining step one of temperature determining step two when the determination result is NO;
Send one group of air-blower control step of one group of air-blower control signal fan control circuit 10; After finishing, this step carries out interrupt step;
Stop temperature determining step one, temperature determining step two, temperature determining step three, temperature determining step four, temperature determining step five, temperature determining step six, temperature determining step seven and temperature acquisition step, and guarantee that stand-by time is the interrupt step of 30 minutes; After finishing, this step carries out the current acquisition step;
Whether judge temperature higher than 35 ℃, and carry out temperature determining step three judgment result is that while being, carry out the temperature determining step two of current acquisition step when the determination result is NO;
Judge whether temperature equals 45 ℃, and carry out two groups of air-blower control steps judgment result is that while being, carry out the temperature determining step three of temperature determining step four when the determination result is NO;
Send two groups of air-blower control steps of two groups of air-blower control signal fan control circuits 10; After finishing, this step carries out interrupt step;
Whether judge temperature higher than 45 ℃, and carry out temperature determining step five judgment result is that while being, carry out the temperature determining step four of current acquisition step when the determination result is NO;
Judge whether temperature equals 55 ℃, and carry out three groups of air-blower control steps judgment result is that while being, carry out the temperature determining step five of temperature determining step six when the determination result is NO;
Send three groups of air-blower control steps of three groups of air-blower control signal fan control circuits 10; After finishing, this step carries out interrupt step;
Whether judge temperature higher than 55 ℃, and carry out temperature determining step seven judgment result is that while being, carry out the temperature determining step six of current acquisition step when the determination result is NO;
Judge whether temperature equals 80 ℃, and carry out whole air-blower control steps judgment result is that while being, carry out the temperature determining step seven of current acquisition step when the determination result is NO;
Send whole air-blower control steps of whole air-blower control signal fan control circuits 10; Return and carry out the current acquisition step, realize cycle control.
Transformer cooling system integrated intelligent controller of the present invention detects oil temperature by temperature sensing circuit 1; detect the blower fan electric current by current detection circuit 2; 6 pairs of temperature signals of single chip circuit and current signal judge; and then pass through draught fan control circuit 10 and determine the duty of blower fans; while by motor protective circuit 13, guaranteeing that electric current surpasses preset value, motor can not be burned; realize the automatic control of transformer cooling system, and had the electric motor protecting function.
The transformer cooling system control method of transformer cooling system integrated intelligent controller of the present invention is determined to need the blower fan group number that starts according to different temperature of oil in transformer, and the blower fan group number of the higher startup of temperature is more.When the double temperature of oil in transformer that detects equated, single chip circuit 6 was controlled impeller of blower by draught fan control circuit 10 and is changed jobs.During higher than preset value, this group oil pump or blower fan group power supply are cut off when oil pump or blower fan group electric current.The whole course of work has realized robotization control, and has the electric motor protecting function, guarantees that blower fan can not be burned.
Description of drawings
Fig. 1 is the theory diagram of transformer cooling system integrated intelligent controller of the present invention;
Fig. 2 is the schematic diagram of draught fan control circuit 10;
Fig. 3 is transformer cooling system control method process flow diagram of the present invention.
Embodiment
embodiment one: present embodiment is described in conjunction with Fig. 1, the described transformer cooling system integrated intelligent controller of present embodiment comprises temperature sensing circuit 1, current detection circuit 2, the first A/D converter 3, the second A/D converter 4, single chip circuit 6, draught fan control circuit 10 and motor protective circuit 13, described temperature sensing circuit 1 is for detection of temperature of oil in transformer, the temperature signal output terminal of described temperature sensing circuit 1 connects the signal input part of the first A/D converter 3, the signal output part of described the first A/D converter 3 connects the temperature signal input end of single chip circuit 6, current detection circuit 2 is for detection of the input current of the blower fan in transformer cooling system or oil-immersed pump, the current signal output end of described current detection circuit 2 connects the signal input part of the second A/D converter 4, the signal output part of the second A/D converter 4 connects the current signal input end of single chip circuit 6, the control signal input end of the air-blower control signal output part connecting fan control circuit 10 of described single chip circuit 6, the protection control signal output terminal of single chip circuit 6 connects the control signal input end of motor protective circuit 13.
The function of motor protective circuit 13 is to guarantee that motor is not by scaling loss.In actual applications, the main cause that causes motor burning is following two classes: the motor overload that (1) a variety of causes causes, and electric current is excessive; (2) current imbalance that causes of phase current imbalance or phase shortage (comprising contacts of contactor scaling loss, the phase shortage that causes of broken string).The described transformer cooling system integrated intelligent controller of present embodiment has phase shortage, overload, phase current unbalance protection, inverse time lag overload protection selection of time, the functions such as overload current settings.The electric current that detects when current detection circuit 2 is during higher than preset value, and single chip circuit 6 sends the electric motor protecting signals to motor protective circuit 13, and motor protective circuit 13 disconnects electric motor loops, guarantees that motor is not by scaling loss.
The described transformer cooling system integrated intelligent controller of present embodiment detects oil temperature by temperature sensing circuit 1; detect the blower fan electric current by current detection circuit 2; 6 pairs of temperature signals of single chip circuit and current signal judge; and then pass through draught fan control circuit 10 and determine the duty of blower fans; while by motor protective circuit 13, guaranteeing that electric current surpasses preset value, motor can not be burned; realize the automatic control of transformer cooling system, and had the electric motor protecting function.
embodiment two: present embodiment is described in conjunction with Fig. 1, the difference of present embodiment and the described transformer cooling system integrated intelligent controller of embodiment one is: it also comprises the first tri-state gate circuit 5, the second tri-state gate circuit 7 and expansion port circuit 8, the signal output part of the first A/D converter 3 connects the temperature signal input end of single chip circuit 6 by the first tri-state gate circuit 5, the signal output part of the second A/D converter 4 connects the current signal input end of single chip circuit 6 by the first tri-state gate circuit 5, the data bus of single chip circuit 6 is connected with the data bus of expansion port circuit 8 by the second tri-state gate circuit 7, the air-blower control signal output part of single chip circuit 6 is by the control signal input end of the second tri-state gate circuit 7 and expansion port circuit 8 connecting fan control circuits 10.
Less when the interface of single chip circuit 6, in the time of can not meeting the external circuit that increases, can increase respectively circuit structure for Extended Capabilities Port quantity at the signal input side of single chip circuit 6 and signal outgoing side.Expansion port circuit 8 in present embodiment adopts 8255 type expansion mouthful chips to realize.
Embodiment three: present embodiment is described in conjunction with Fig. 1, the difference of present embodiment and the described transformer cooling system integrated intelligent controller of embodiment two is: it also comprises digital display circuit 9, and the display control signal input end of described digital display circuit 9 connects the display control signal output terminal of expansion port circuit 8.
Digital display circuit 9 is used for the temperature of oil in transformer that displays temperature testing circuit 1 detects, and is to save the I/O mouth, and this number display circuit 9 adopts dynamically and shows, adopts 74LS47 type decoder driver to drive seven sections common anode charactrons.Because the rated current of common anode charactron is less, the small resistor of need to connecting on charactron.
Embodiment four: present embodiment is described in conjunction with Fig. 1, the difference of present embodiment and the described transformer cooling system integrated intelligent controller of embodiment two is: it also comprises working indicating 11, and the indication control signal input end of described working indicating 11 connects the indication control signal output terminal of expansion port circuit 8.
Working indicating 11 is used for showing the blower fan group number of work.
Embodiment five: present embodiment is described in conjunction with Fig. 1, the difference of present embodiment and the described transformer cooling system integrated intelligent controller of embodiment one is: it also comprises failure alarm circuit 12, and the control signal input end of described failure alarm circuit 12 connects the alarm control signal output terminal of single chip circuit 6.
When temperature surpasses 80 ℃, failure alarm circuit 12 information that gives a warning.
Embodiment six: in conjunction with Fig. 1, present embodiment is described, the difference of present embodiment and embodiment one to five described transformer cooling system integrated intelligent controller is: described temperature sensing circuit 1 adopts the integrated two ends of AD590 type monolithic temperature-sensitive current source to realize.
The current value of the integrated two ends of AD590 type monolithic temperature-sensitive current source output is linear relationship with the absolute temperature of surveying, and temperature measurement range is-55 ℃～+ 150 ℃, and nonlinearity erron is ± 0.3 ℃, and 1 ℃ of its electric current of the every increase of temperature increases 1uA.The temperature signal that gathers enters the first A/D converter 3 after the linear optical coupling isolation, be sent to single-chip microcomputer and process after the first A/D converter 3 analog to digital conversion.
Embodiment seven: in conjunction with Fig. 1, present embodiment is described, the difference of present embodiment and embodiment one to five described transformer cooling system integrated intelligent controller is: described single chip circuit 6 adopts AT89C51 type chip microcontroller.
Embodiment eight: in conjunction with Fig. 1, present embodiment is described, the difference of present embodiment and embodiment one to five described transformer cooling system integrated intelligent controller is: described current detection circuit 2 adopts a straight-through current transformer to realize.
Embodiment nine: in conjunction with Fig. 1 and Fig. 2, present embodiment is described, the difference of present embodiment and embodiment one to five described transformer cooling system integrated intelligent controller is: described draught fan control circuit 10 adopts the SSR solid-state relay to realize.
Draught fan control circuit 10 adopts the SSR solid-state relay to realize.The SSR solid-state relay is a kind of contactless electronic switch, has adopted high withstand voltage photoelectrical coupler between its input and output, has realized the electrical isolation of input with output, has guaranteed the normal operation of control circuit.Compare traditional mechanical relay and contactor, the advantage such as that the SSR solid-state relay has is contactless, no-spark is disturbed, life-span surge current long, corrosion-resistant, that can bear is large and drive current is little.The starting and stopping signal of blower fan is sent to photoisolator MOC3041 by single-chip microcomputer, and T1 is bidirectional triode thyristor, in MOC3041 inside, light emitting diode is arranged not only, and also has zero cross detection circuit and another bidirectional triode thyristor.When the A point has " 1 " when signal comes, the lumination of light emitting diode in MOC3041, due to the synchronous effect of zero crossing circuitry, the bidirectional triode thyristor of MOC3041 inside is conducting at once after zero passage, thereby makes the T1 conducting, has electric current to pass through in blower fan; When being input as " 0 " signal, in blower fan, no current passes through, thereby reaches starting and stopping and the rotation of blower fan.
The concrete structure of transformer cooling system integrated intelligent controller of the present invention is not limited to the concrete technical scheme that the respective embodiments described above are put down in writing, and can also be the reasonable combination of the technical characterictic put down in writing of above-mentioned each embodiment.
Embodiment ten: in conjunction with Fig. 3, present embodiment is described, present embodiment is based on the transformer cooling system control method of the described transformer cooling system integrated intelligent controller of embodiment one, and described control method realizes by following steps:
Gather the current acquisition step of the current signal of current detection circuit 2 transmissions;
Whether judge described current signal higher than preset value, and, judgment result is that actuating motor protection step while being, return to the electric current determining step of carrying out the temperature acquisition step when the determination result is NO;
Send the electric motor protecting step of electric motor protecting signal to motor protective circuit 13;
The temperature acquisition step of the temperature signal that collecting temperature testing circuit 1 sends; The recording step of this temperature signal of executive logging after this step finishes; Carry out temperature comparison step after this recording step finishes, also carry out simultaneously temperature determining step one;
Be used for the temperature signal that temperature signal that recording step relatively records and a front recording step record, and at comparative result, carry out the blower fan shift step while being identical, return to the temperature comparison step of execution current acquisition step at comparative result when not identical;
Send the blower fan shift step of rotation signal fan control circuit 10;
Judge whether described temperature signal equals 35 ℃, and carry out one group of air-blower control step judgment result is that while being, carry out the temperature determining step one of temperature determining step two when the determination result is NO;
Send one group of air-blower control step of one group of air-blower control signal fan control circuit 10; After finishing, this step carries out interrupt step;
Stop temperature determining step one, temperature determining step two, temperature determining step three, temperature determining step four, temperature determining step five, temperature determining step six, temperature determining step seven and temperature acquisition step, and guarantee that stand-by time is the interrupt step of 30 minutes; After finishing, this step carries out the current acquisition step;
Whether judge temperature higher than 35 ℃, and carry out temperature determining step three judgment result is that while being, carry out the temperature determining step two of current acquisition step when the determination result is NO;
Judge whether temperature equals 45 ℃, and carry out two groups of air-blower control steps judgment result is that while being, carry out the temperature determining step three of temperature determining step four when the determination result is NO;
Send two groups of air-blower control steps of two groups of air-blower control signal fan control circuits 10; After finishing, this step carries out interrupt step;
Whether judge temperature higher than 45 ℃, and carry out temperature determining step five judgment result is that while being, carry out the temperature determining step four of current acquisition step when the determination result is NO;
Judge whether temperature equals 55 ℃, and carry out three groups of air-blower control steps judgment result is that while being, carry out the temperature determining step five of temperature determining step six when the determination result is NO;
Send three groups of air-blower control steps of three groups of air-blower control signal fan control circuits 10; After finishing, this step carries out interrupt step;
Whether judge temperature higher than 55 ℃, and carry out temperature determining step seven judgment result is that while being, carry out the temperature determining step six of current acquisition step when the determination result is NO;
Judge whether temperature equals 80 ℃, and carry out whole air-blower control steps judgment result is that while being, carry out the temperature determining step seven of current acquisition step when the determination result is NO;
Send whole air-blower control steps of whole air-blower control signal fan control circuits 10; Return and carry out the current acquisition step, realize cycle control.
The control method of the described transformer cooling system integrated intelligent controller of present embodiment adopts blower fan the forced oil-circulation system to be blown to reduce the temperature of transformer inside.Whole blower fans are divided into four groups.Prescribe a time limit lower than the lower of a certain preset value when temperature of oil in transformer, single chip circuit 6 makes blower fan all be in halted state, and along with the variation of temperature, the blower fan group number of unlatching also changes thereupon.When temperature reaches 35 ℃, drop into first group of blower fan, later every rising 5-10 ℃ (this temperature can be set according to actual conditions), increase by one group of blower fan.When temperature of oil in transformer reached 60 ℃, all blower fans all opened, when temperature is reduced to 55 ℃, stop 1 group of blower fan, 5-10 ℃ of later every reduction (this temperature can be set according to actual conditions), stop 1 group of blower fan, can set according to blower fan group number, until all stop 30 ℃ the time.Blower fan total quantity and at every turn increase or the quantity that stops can need be set according to reality.When temperature surpasses 80 ℃, failure alarm circuit 12 information that gives a warning.
Need after temperature, current acquisition that it is carried out A/D and transform, adopt interrupt mode to judge whether temperature converts.Whether row A/D conversion and judgement row A/D transform to complete all and complete in subprocess, main procedure circulation transmission data., if do not convert, just by serial communication, ceaselessly send the corresponding units of Current Temperatures unit to single chip circuit 6.If convert, just enter interrupt procedure, read in digital quantity corresponding to Current Temperatures, carry out Temperature Treatment, then determine the duty of blower fan according to the temperature that gathers, call 30 minutes time delay processes, again start the first A/D converter 3 and carry out temperature acquisition conversion, and return to main procedure and circulate and send data to single chip circuit 6.
The explanation present embodiment as an example of four groups of blower fans example.Whole blower fans are divided into four groups.In general transformer temperature is between 30 ℃～50 ℃, so just may cause first group of blower fan continuous working, and all the other six groups of blower fans of transformer is worked hardly.First group of blower fan easily produces heating, and easily aged deterioration is than very fast.For addressing this problem,, just must adjust the order of blower fan in same interval when the temperature of each collection and the temperature that gathered last time, blower fan can be taken turns change jobs.The wheel of blower fan changes jobs and judges selection by the expression position.Below describe for example, 8 groups of blower fans are divided into 4 groups.Blower fan when table 1 is 50 ℃～60 ℃ of detected temperatures is opened situation, the table 2 blower fan unlatching situation that is detected temperatures when 40 ℃～50 ℃ and 60 ℃～70 ℃.Wherein R3, R4, R5 are respectively the registers of 40 ℃～50 ℃, 50 ℃～60 ℃ and 60 ℃～70 ℃ of correspondences.After a kind of blower fan work of every selection, call the time delay subroutine of 30 minutes, then return to master routine, temperature acquisition, determine blower fan work next time again.Wherein 50 ℃, 60 ℃ identical with 70 ℃.
Table 1
| R4 | The working fan group |
| 00H | First and second group |
| Other | Third and fourth group |
Table 2
| R3 | The working fan group | R5 | The working fan group |
| 00H | First group | 00H | First, second and third group |
| 01H | Second group | 01H | First and second, four groups |
| 02H | The 3rd group | 02H | First and third, four groups |
| Other | The 4th group | Other | Second and third, four groups |
The control method of transformer cooling system integrated intelligent controller is opened corresponding blower fan group number according to the different temperatures value, guarantees that transformer temperature moves within the specific limits, extends the serviceable life of transformer, has effectively solved the oil seepage that causes greatly due to the temperature difference.Through the rotation between the laggard sector-style machine of certain hour, service life of fan is extended relatively under same temperature.When the fault such as phase shortage, overcurrent appearred in oil-immersed pump and blower fan, the automatic cutout motor power also sent alarm signal, thereby guaranteed that motor can scaling loss, had realized the intellectuality of transformer temperature control system.
Claims (10)
1. transformer cooling system integrated intelligent controller, it is characterized in that: it comprises temperature sensing circuit (1), current detection circuit (2), the first A/D converter (3), the second A/D converter (4), single chip circuit (6), draught fan control circuit (10) and motor protective circuit (13), described temperature sensing circuit (1) is for detection of temperature of oil in transformer, the temperature signal output terminal of described temperature sensing circuit (1) connects the signal input part of the first A/D converter (3), the signal output part of described the first A/D converter (3) connects the temperature signal input end of single chip circuit (6), current detection circuit (2) is for detection of the input current of the blower fan in transformer cooling system or oil-immersed pump, the current signal output end of described current detection circuit (2) connects the signal input part of the second A/D converter (4), the signal output part of the second A/D converter (4) connects the current signal input end of single chip circuit (6), the control signal input end of the air-blower control signal output part connecting fan control circuit (10) of described single chip circuit (6), the protection control signal output terminal of single chip circuit (6) connects the control signal input end of motor protective circuit (13).
2. transformer cooling system integrated intelligent controller according to claim 1, it is characterized in that: it also comprises the first tri-state gate circuit (5), the second tri-state gate circuit (7) and expansion port circuit (8), the signal output part of the first A/D converter (3) connects the temperature signal input end of single chip circuit (6) by the first tri-state gate circuit (5), the signal output part of the second A/D converter (4) connects the current signal input end of single chip circuit (6) by the first tri-state gate circuit (5), the data bus of single chip circuit (6) is connected with the data bus of expansion port circuit (8) by the second tri-state gate circuit (7), the air-blower control signal output part of single chip circuit (6) is by the control signal input end of the second tri-state gate circuit (7) and expansion port circuit (8) connecting fan control circuit (10).
3. transformer cooling system integrated intelligent controller according to claim 2, it is characterized in that: it also comprises digital display circuit (9), and the display control signal input end of described digital display circuit (9) connects the display control signal output terminal of expansion port circuit (8).
4. transformer cooling system integrated intelligent controller according to claim 2, it is characterized in that: it also comprises working indicating (11), and the indication control signal input end of described working indicating (11) connects the indication control signal output terminal of expansion port circuit (8).
5. transformer cooling system integrated intelligent controller according to claim 1, it is characterized in that: it also comprises failure alarm circuit (12), and the control signal input end of described failure alarm circuit (12) connects the alarm control signal output terminal of single chip circuit (6).
6. according to claim 1,2,3,4 or 5 described transformer cooling system integrated intelligent controllers, it is characterized in that: described temperature sensing circuit (1) adopts the integrated two ends of AD590 type monolithic temperature-sensitive current source to realize.
7. according to claim 1,2,3,4 or 5 described transformer cooling system integrated intelligent controllers, it is characterized in that: described single chip circuit (6) adopts AT89C51 type chip microcontroller.
8. according to claim 1,2,3,4 or 5 described transformer cooling system integrated intelligent controllers, it is characterized in that: described current detection circuit (2) adopts a straight-through current transformer to realize.
9. according to claim 1,2,3,4 or 5 described transformer cooling system integrated intelligent controllers, it is characterized in that: described draught fan control circuit (10) adopts the SSR solid-state relay to realize.
10., based on the transformer cooling system control method of transformer cooling system integrated intelligent controller claimed in claim 1, it is characterized in that: described control method realizes by following steps:
Gather the current acquisition step of the current signal of current detection circuit (2) transmission;
Whether judge described current signal higher than preset value, and judgment result is that actuating motor protection step while being, carry out the electric current determining step of temperature acquisition step when the determination result is NO;
Send the electric motor protecting step of electric motor protecting signal to motor protective circuit (13), control and finish;
The temperature acquisition step of the temperature signal that collecting temperature testing circuit (1) sends; The recording step of this temperature signal of executive logging after this step finishes; After finishing, carries out this recording step temperature comparison step;
Be used for the temperature signal that temperature signal that recording step relatively records and a front recording step record, and at comparative result, carry out the blower fan shift step while being identical, at comparative result execution temperature determining step one when not identical;
Send the blower fan shift step of rotation signal fan control circuit (10);
Judge whether described temperature signal equals 35 ℃, and carry out one group of air-blower control step judgment result is that while being, carry out the temperature determining step one of temperature determining step two when the determination result is NO;
Send one group of air-blower control step of one group of air-blower control signal fan control circuit (10); After finishing, this step carries out interrupt step;
The timing interrupt step of 30 minutes; After finishing, this step carries out the current acquisition step;
Whether judge temperature higher than 35 ℃, and carry out temperature determining step three judgment result is that while being, carry out the temperature determining step two of current acquisition step when the determination result is NO;
Judge whether temperature equals 45 ℃, and carry out two groups of air-blower control steps judgment result is that while being, carry out the temperature determining step three of temperature determining step four when the determination result is NO;
Send two groups of air-blower control steps of two groups of air-blower control signal fan control circuits (10); After finishing, this step carries out interrupt step;
Whether judge temperature higher than 45 ℃, and carry out temperature determining step five judgment result is that while being, carry out the temperature determining step four of current acquisition step when the determination result is NO;
Judge whether temperature equals 55 ℃, and carry out three groups of air-blower control steps judgment result is that while being, carry out the temperature determining step five of temperature determining step six when the determination result is NO;
Send three groups of air-blower control steps of three groups of air-blower control signal fan control circuits (10); After finishing, this step carries out interrupt step;
Whether judge temperature higher than 55 ℃, and carry out temperature determining step seven judgment result is that while being, carry out the temperature determining step six of current acquisition step when the determination result is NO;
Judge whether temperature equals 80 ℃, and carry out whole air-blower control steps judgment result is that while being, carry out the temperature determining step seven of current acquisition step when the determination result is NO;
Send whole air-blower control steps of whole air-blower control signal fan control circuits (10); Return and carry out the current acquisition step, realize cycle control.
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| CN2013103297994A CN103389672A (en) | 2013-07-31 | 2013-07-31 | Comprehensive and intelligent controller of transformer cooling system and transformer cooling system control method of controller |
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| CN2013103297994A CN103389672A (en) | 2013-07-31 | 2013-07-31 | Comprehensive and intelligent controller of transformer cooling system and transformer cooling system control method of controller |
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| CN2013103297994A Pending CN103389672A (en) | 2013-07-31 | 2013-07-31 | Comprehensive and intelligent controller of transformer cooling system and transformer cooling system control method of controller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785880A (en) * | 2016-05-09 | 2016-07-20 | 国网宁夏电力公司检修公司 | System for achieving intelligent control of transformer cooler group based on double closed loops |
| CN110081013A (en) * | 2019-05-21 | 2019-08-02 | 保定天威保变电气股份有限公司 | A kind of control cabinet and control method that impeller of blower under auto state may be implemented and changes starting control |
| CN112909796A (en) * | 2021-02-06 | 2021-06-04 | 陕西安得电力设备制造有限公司 | Intelligent control system for unattended transformer substation |
| CN115013347A (en) * | 2022-07-22 | 2022-09-06 | 青岛融合光电科技有限公司 | Intelligent control method and system for fan in carrier plate glass production workshop |
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| CN101943921A (en) * | 2010-08-10 | 2011-01-12 | 西安市双合软件技术有限公司 | Intelligent control method and intelligent control device of transformer cooling system |
| CN102692935A (en) * | 2012-05-16 | 2012-09-26 | 张金木 | Temperature display controlling device for dry-type transformer |
| CN102890520A (en) * | 2011-07-20 | 2013-01-23 | 上海海能信息科技有限公司 | Method for controlling energy saving and benefit increasing of transformer |
| CN203350670U (en) * | 2013-07-31 | 2013-12-18 | 国家电网公司 | Transformer cooling system comprehensive and intelligent controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101943921A (en) * | 2010-08-10 | 2011-01-12 | 西安市双合软件技术有限公司 | Intelligent control method and intelligent control device of transformer cooling system |
| CN102890520A (en) * | 2011-07-20 | 2013-01-23 | 上海海能信息科技有限公司 | Method for controlling energy saving and benefit increasing of transformer |
| CN102692935A (en) * | 2012-05-16 | 2012-09-26 | 张金木 | Temperature display controlling device for dry-type transformer |
| CN203350670U (en) * | 2013-07-31 | 2013-12-18 | 国家电网公司 | Transformer cooling system comprehensive and intelligent controller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785880A (en) * | 2016-05-09 | 2016-07-20 | 国网宁夏电力公司检修公司 | System for achieving intelligent control of transformer cooler group based on double closed loops |
| CN110081013A (en) * | 2019-05-21 | 2019-08-02 | 保定天威保变电气股份有限公司 | A kind of control cabinet and control method that impeller of blower under auto state may be implemented and changes starting control |
| CN110081013B (en) * | 2019-05-21 | 2023-12-12 | 保定天威保变电气股份有限公司 | Control box capable of realizing fan rotation starting control under automatic state |
| CN112909796A (en) * | 2021-02-06 | 2021-06-04 | 陕西安得电力设备制造有限公司 | Intelligent control system for unattended transformer substation |
| CN115013347A (en) * | 2022-07-22 | 2022-09-06 | 青岛融合光电科技有限公司 | Intelligent control method and system for fan in carrier plate glass production workshop |
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