CN210488340U - Intelligent temperature control system for transformer - Google Patents
Intelligent temperature control system for transformer Download PDFInfo
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- CN210488340U CN210488340U CN201921356497.5U CN201921356497U CN210488340U CN 210488340 U CN210488340 U CN 210488340U CN 201921356497 U CN201921356497 U CN 201921356497U CN 210488340 U CN210488340 U CN 210488340U
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Abstract
The utility model relates to the technical field of transformers, in particular to an intelligent temperature control system of a transformer, which comprises a transformer body, a control circuit and a heat dissipation fan set, wherein the heat dissipation fan set is fixed on the transformer body; the control circuit comprises a first thermistor, a second thermistor, a first comparator, a second comparator, a first resistor, a second resistor, a first diode and a first triode; one end of the first thermistor is connected with one end of the second thermistor, and the other end of the second thermistor is connected with a positive pin of the first comparator; the output end of the first comparator is connected with one end of the first resistor, the other end of the first resistor is connected with a negative pin of the second comparator, the output end of the second comparator is connected with the negative electrode of the first diode, the positive electrode of the first diode is connected with the base electrode of the first triode, and the emitting electrode of the first triode is connected with the heat dissipation fan set. Adopt the technical scheme of the utility model the space occupies for a short time.
Description
Technical Field
The utility model relates to a transformer technical field, in particular to transformer temperature intelligence control system.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, is one of important operation devices of a power system, has the operation state which plays a vital role in the safety of a power grid, and the working temperature of the power transformer is the most direct embodiment of the operation state of the transformer, so that if the working temperature is abnormal, the problem that a certain amount of internal voltage of the power transformer exists is more or less solved.
For this reason, it is necessary to cool down the transformer having an excessively high temperature. The transformer temperature control system disclosed in the Chinese patent with the publication number of CN208172628U comprises a transformer body, a column-type evaporating pipe is arranged below the inner part of the transformer body, the column-type evaporating pipe is communicated with a compressor through a pipeline, a spiral condensing pipe is communicated with the right side of the compressor through a pipeline, the other end of the spiral condensing pipe is connected with the right side of the column-type evaporating pipe through a pipeline, an air flow ventilator is fixedly welded on the left side of the spiral condensing pipe, supporting frames are fixedly welded on the two sides of the outer surface of the transformer body, a central processing unit is fixedly arranged on the upper surface of the supporting frame on the left side of the transformer body, a temperature sensor is fixedly arranged on the inner wall of.
Can derive the heat of transformer body to the line formula evaporating pipe through above-mentioned scheme on, discharge the heat through evaporation endothermic effect. However, in order to achieve sufficient heat absorption, the volume of the column-type evaporation tube needs to be increased, which increases the volume of the transformer body and occupies a large installation space. In order to compress the installation space of the heat dissipation mechanism, a device for dissipating heat by a fan has been developed. The control logic of the existing fan for heat dissipation is mostly a fan which is automatically turned on when the temperature is higher than a threshold value. The mode can not adjust the rotating speed of the fan in a self-adaptive mode according to the temperature change, and the heat dissipation effect is not ideal. The scheme that the rotating speed of the fan is controlled by the PID control system according to the monitored temperature after the temperature sensor is arranged has the problems of more components, high cost and higher failure rate.
For this reason, a simple temperature control system capable of adaptive temperature is required.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims to provide a transformer temperature intelligence control system.
The utility model discloses technical scheme as follows:
the intelligent transformer temperature control system comprises a transformer body, a control circuit and a heat dissipation fan set, wherein the heat dissipation fan set is fixed on the transformer body;
the control circuit comprises a first thermistor, a second thermistor, a first comparator, a second comparator, a first resistor, a second resistor, a first diode and a first triode; one end of the first thermistor is connected with one end of the second thermistor, and the other end of the second thermistor is connected with a positive pin of the first comparator; the output end of the first comparator is connected with one end of the first resistor, the other end of the first resistor is connected with a negative pin of the second comparator, the output end of the second comparator is connected with the negative electrode of the first diode, the positive electrode of the first diode is connected with the base electrode of the first triode, and the emitting electrode of the first triode is connected with the heat-radiating fan set; the negative pin of the first comparator is connected with the output end of the first comparator; one end of the second resistor is connected with a negative pin of the second comparator, and the other end of the second resistor is connected with an output end of the second comparator.
The basic scheme principle and the beneficial effects are as follows:
when the transformer normally works, the temperature inside the shell is relatively low, the resistance values of the first thermistor and the second thermistor are high, the voltage at the positive pin of the first comparator is negative, the voltage at the output end of the first comparator is also negative, the voltage at the negative pin of the second comparator is negative, the voltage at the output end of the second comparator is positive, the first diode is cut off, the first triode is cut off, no current passes through the heat dissipation fan set at the moment, and the heat dissipation fan set does not work.
When the temperature in the transformer shell gradually rises, the resistance values of the first thermistor and the second thermistor are gradually reduced after being heated, the voltage at the positive pin of the first comparator is positive, and the voltage at the output end of the first comparator is positive; the voltage at the negative pin of the second comparator is positive, the voltage at the output end of the second comparator is negative, and the first diode and the first triode are both conducted; the current flows through the heat dissipation fan set, and the heat dissipation fan set starts to work.
The higher the temperature in the transformer shell is, the lower the resistance values of the first thermistor and the second thermistor are, the larger the current flowing through the heat dissipation fan set is, the faster the rotating speed of the heat dissipation fan set is, and the quicker heat dissipation can be realized. When the temperature in the transformer shell is reduced, the resistance values of the first thermistor and the second thermistor are increased, and the rotating speed of the heat dissipation fan set is reduced. In other words, the rotating speed of the heat dissipation fan set is positively correlated with the temperature inside the transformer shell, the rotating speed is high when the temperature is high, and the rotating speed is slow until the heat dissipation fan set does not rotate when the temperature is low. Compared with the existing fan which can only be automatically opened when the temperature is higher than the threshold value, the fan has stronger pertinence and better heat dissipation effect; and the heat dissipation fan set does not need to run at full load all the time, so that the energy can be effectively saved. The heat dissipation fan unit dissipates heat through circulation of air flow, and occupies a smaller volume compared with a case that the evaporation tubes are arranged in a row mode.
Through setting up two thermistors, the scope of detection is bigger, can avoid single thermistor to start the heat dissipation fan group because of local temperature anomaly. In the scheme, the rotating speed control is realized based on the thermistor, and compared with the combination of a temperature sensor and PID (proportion integration differentiation) control, the cost is lower.
Further, the resistance value of the first thermistor is larger than that of the second thermistor, and the first thermistor and the second thermistor are all negative temperature coefficient thermistors.
When the temperature of the negative temperature coefficient thermistor rises, the resistance is reduced, the heat dissipation fan set can be effectively controlled through the voltage change in the circuit, and compared with a PID control mode, the control link is simpler and more reliable.
Further, the transformer body comprises a base, a shell and a transformation element arranged in the shell; the bottom of the shell is fixed on the base.
Through fixing the transformer body on the base, can provide firm support for the transformer.
Further, the first thermistor is fixed in the shell, and the second thermistor is fixed outside the shell.
If only a single thermistor is arranged in the shell, the local temperature rise is easy to cause high-power rotation of the heat dissipation fan set due to poor air circulation in the shell. By arranging the two thermistors inside and outside the housing, respectively, the range of temperature monitoring is greater. If inside only local temperature rises, influence outside the shell is less, and the outer second thermistor resistance of shell is great, and the fan group that dispels the heat this moment only can low-power rotate, and the circulation of air can effectively solve the problem that local temperature rose, has effectively practiced thrift the energy, has also prolonged the life of heat dissipation fan group. When the overall temperature in the shell rises, the temperature can be transmitted to the outside of the shell through the shell, so that the resistance value of the second thermistor is reduced, the high-power rotation of the heat dissipation fan set dissipates heat at the moment, and the heat dissipation effect is good. Because the temperature outside the shell is inevitably lower than the temperature inside the shell, in order to ensure the smooth operation of the heat dissipation fan set, the resistance value of the first thermistor is set to be larger than that of the second thermistor.
Further, a fan hole is formed in the top of the shell; the heat dissipation fan set comprises a first fan; the first fan is fixed on a fan hole at the top of the shell.
The inside hot-air upflow of shell through set up first fan at the shell top, can take out hot-air fast.
Further, the bottom of the shell is also provided with a fan hole; the heat dissipation fan set also comprises a second fan; the second fan is fixed on a fan hole at the bottom of the shell.
The second fan draws outside cold air from the shell bottom, and first fan is taken hot-air out from the top of shell again, accelerates the convection of air, can strengthen the radiating effect.
Further, first fan and second fan all include signal output part.
The running signals of the first fan and the second fan can be output through the signal output end, and subsequent monitoring is facilitated.
The circuit further comprises a second diode, a third diode, a first capacitor, a second triode, a third resistor and a signal feedback port; the signal output end of the first fan is connected with the anode of the second diode, and the signal output end of the second fan is connected with the anode of the third diode; the cathode of the second diode is connected with the base electrode of the second triode, and the cathode of the third diode is connected with the base electrode of the third triode; the emitting electrodes of the second triode and the third triode are connected with the signal feedback port; the emitting electrodes of the second triode and the third triode are also connected with one end of a third resistor; the signal feedback port is also connected with the other end of the second thermistor; one end of the first capacitor is connected with the anode of the second diode, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the anode of the third diode, and the other end of the second capacitor is grounded.
In the process of rotating the first fan and the second fan, the fans can output operation signals through the signal output end, and the operation signals are respectively amplified through the second triode and the third triode and then output to the signal feedback port; when the first thermistor and the second thermistor are disconnected, the voltage at the signal feedback port is lower; in actual operation, the monitoring equipment can be connected to the signal feedback port to monitor the operation states of the first fan and the second fan in real time, and whether the second thermistor is broken or not can be monitored.
Furthermore, a dustproof net is fixed on one side, away from the shell, of each of the first fan and the second fan.
The dust entering the shell is reduced by arranging the dust screen.
Further, the dust screen is made of a circular metal material.
Compared with plastic materials, the metal materials are more resistant to high temperature and have long service life.
Drawings
FIG. 1 is a longitudinal sectional view of a transformer body according to an embodiment of the intelligent temperature control system of the transformer;
FIG. 2 is a circuit diagram of a control circuit of an embodiment of an intelligent transformer temperature control system;
fig. 3 is a circuit diagram of a control circuit of a transformer temperature intelligent control system according to a second embodiment.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include:
the fan comprises a base 1, a shell 2, a first fan M1, a second fan M2, a first thermistor RF1, a second thermistor RF2, a first comparator U1, a second comparator U2, a first resistor R1, a second resistor R2, a first diode D1, a first triode Q1, a second diode D2, a third diode D3, a first capacitor C1, a second capacitor C2, a second triode Q2, a third triode Q3, a third resistor R3 and a signal feedback port H1.
Example one
Transformer temperature intelligence control system is including transformer body, control circuit and heat dissipation fan group. In this embodiment, the transformer body is a dry-type transformer. As shown in fig. 1, the transformer body includes a base 1, a case 2, and a transforming element disposed within the case 2. In this embodiment, the housing 2 is a cube, and four corners of the bottom of the housing 2 are fixed on the base 1 by screws. The top and the bottom of the shell 2 are both provided with a circular fan hole. The heat dissipation fan set comprises a first fan M1 and a second fan M2. The first fan M1 and the second fan M2 are fixed to the fan holes at the top and bottom of the casing 2 by screws, respectively.
As shown in fig. 2, the control circuit includes a first thermistor RF1, a second thermistor RF2, a first comparator U1, a second comparator U2, a first resistor R1, a second resistor R2, a first diode D1, and a first transistor Q1. In this embodiment, the first thermistor and the second thermistor both use negative temperature coefficient thermistors, the resistance change of which is opposite to the temperature change, and the temperature rise resistance is reduced. The resistance value of the first thermistor is larger than that of the second thermistor. In this embodiment, at 25 ℃, the resistance of the first thermistor is 250-.
One end of the first thermistor RF1 is connected to one end of the second thermistor RF 2; the other end of the second thermistor RF2 is connected to the positive pin of the first comparator U1.
The output end of the first comparator U1 is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with the negative pin of a second comparator U2, the output end of the second comparator U2 is connected with the negative electrode of a first diode D1, the positive electrode of a first diode D1 is connected with the base electrode of a first triode Q1, and the emitting electrode of the first triode Q1 is connected with the input ends of the first fan and the second fan respectively. The negative pin of the first comparator U1 is connected to the output of the first comparator U1. One end of the second resistor R2 is connected to the negative pin of the second comparator U2, and the other end of the second resistor R2 is connected to the output terminal of the second comparator U2.
The first thermistor RF1 and the second thermistor RF2 are respectively bonded to the inner wall of the case 2 and the outer wall of the case 2 after being wrapped by an insulating material. In practical application, an insulating material with high temperature resistance and good heat conductivity can be selected.
When the transformer normally works, the internal temperature of the housing 2 is relatively low, at this time, the resistance values of the first thermistor RF1 and the second thermistor RF2 are relatively high, at this time, the voltage at the positive pin of the first comparator U1 is negative, the voltage at the output end of the first comparator U1 is also negative, the voltage at the negative pin of the second comparator U2 is negative, the voltage at the output end of the second comparator U2 is positive, the first diode D1 is cut off, the first triode Q1 is cut off, at this time, no current passes through the first fan M1 and the second fan M2, and the first fan M1 and the second fan M2 do not work.
When the temperature in the transformer housing 2 gradually rises and is gradually transmitted to the outer wall of the housing 2, the resistance values of the first thermistor RF1 and the second thermistor RF2 are gradually reduced after being heated, the voltage at the positive pin of the first comparator U1 is positive, and the voltage at the output end of the first comparator U1 is positive; the voltage at the negative pin of the second comparator U2 is positive, the voltage at the output end of the second comparator U2 is negative, and the first diode D1 and the first triode Q1 are both conducted; current flows through the first fan M1 and the second fan M2, and the first fan M1 and the second fan M2 operate.
The higher the temperature inside the transformer housing 2 is, the lower the resistance values of the first thermistor RF1 and the second thermistor RF2 are, the higher the current flowing through the first fan M1 and the second fan M2 is, and the faster the rotation speeds of the first fan M1 and the second fan M2 are, so that the heat can be dissipated more quickly. When the temperature inside the transformer housing 2 is lowered, the resistances of the first thermistor RF1 and the second thermistor RF2 become large, and the rotational speeds of the first fan M1 and the second fan M2 become slow. In other words, the rotation speeds of the first fan M1 and the second fan M2 are positively correlated with the temperature inside the transformer housing 2, and the rotation speed is slow until the rotation speed is not rotated when the temperature is high and the rotation speed is slow when the temperature is low. Can effectively dissipate heat and save energy.
Example two
As shown in fig. 3, the intelligent transformer temperature control system is different from the first embodiment in that: the circuit also comprises a second diode D2, a third diode D3, a first capacitor C1, a second capacitor C2, a second triode Q2, a third triode Q3, a third resistor R3 and a signal feedback port H1.
The first fan M1 and the second fan M2 each comprise a signal output terminal for outputting an operation signal; the signal output end of the first fan M1 is connected with the anode of the second diode D2, and the signal output end of the second fan M2 is connected with the anode of the third diode D3.
The cathode of the second diode D2 is connected with the base of the second triode Q2, and the cathode of the third diode D3 is connected with the base of the third triode Q3; the emitters of the second triode Q2 and the third triode Q3 are both connected with a signal feedback port H1;
the emitting electrodes of the second triode Q2 and the third triode Q3 are also connected with one end of a third resistor R3; the signal feedback port H1 is also connected to the other end of the second thermistor RF 2. One end of the first capacitor C1 is connected with the anode of the second diode D2, and the other end of the first capacitor C1 is grounded;
one end of the second capacitor C2 is connected to the anode of the third diode D3, and the other end of the second capacitor C2 is grounded.
In the process of rotating the first fan M1 and the second fan M2, the fans can output operation signals through the signal output ends, and the operation signals are respectively amplified by the second triode Q2 and the third triode Q3 and then output to the signal feedback port H1; when the first thermistor RF1 and the second thermistor RF2 are open-circuited, the voltage at the signal feedback port H1 is low.
In actual operation, the monitoring device can be connected to the signal feedback port H1 to monitor the operating states of the first fan M1 and the second fan M2 in real time, and also monitor whether an open circuit occurs at the second thermistor RF 2.
EXAMPLE III
The intelligent transformer temperature control system is different from the first embodiment in that: the first fan M1 and the second fan M2 are fixed with a circular dust screen made of metal through screws on the sides far away from the shell 2. Dust ingress into the housing 2 is reduced by the provision of a dust screen.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. Transformer temperature intelligence control system, including transformer body, control circuit and heat dissipation fan group, its characterized in that: the heat dissipation fan set is fixed on the transformer body;
the control circuit comprises a first thermistor, a second thermistor, a first comparator, a second comparator, a first resistor, a second resistor, a first diode and a first triode; one end of the first thermistor is connected with one end of the second thermistor, and the other end of the second thermistor is connected with a positive pin of the first comparator; the output end of the first comparator is connected with one end of the first resistor, the other end of the first resistor is connected with a negative pin of the second comparator, the output end of the second comparator is connected with the negative electrode of the first diode, the positive electrode of the first diode is connected with the base electrode of the first triode, and the emitting electrode of the first triode is connected with the heat-radiating fan set; the negative pin of the first comparator is connected with the output end of the first comparator; one end of the second resistor is connected with a negative pin of the second comparator, and the other end of the second resistor is connected with an output end of the second comparator.
2. The intelligent transformer temperature control system of claim 1, wherein: the resistance value of the first thermistor is larger than that of the second thermistor, and the first thermistor and the second thermistor are all negative temperature coefficient thermistors.
3. The intelligent transformer temperature control system of claim 2, wherein: the transformer body comprises a base, a shell and a transformation element arranged in the shell; the bottom of the shell is fixed on the base.
4. The intelligent transformer temperature control system of claim 3, wherein: the first thermistor is fixed in the shell, and the second thermistor is fixed outside the shell.
5. The intelligent transformer temperature control system of claim 4, wherein: the top of the shell is provided with a fan hole; the heat dissipation fan set comprises a first fan; the first fan is fixed on a fan hole at the top of the shell.
6. The intelligent transformer temperature control system of claim 5, wherein: the bottom of the shell is also provided with a fan hole; the heat dissipation fan set also comprises a second fan; the second fan is fixed on a fan hole at the bottom of the shell.
7. The intelligent transformer temperature control system of claim 6, wherein: the first fan and the second fan both comprise signal output ends.
8. The intelligent transformer temperature control system of claim 7, wherein: the circuit also comprises a second diode, a third diode, a first capacitor, a second triode, a third resistor and a signal feedback port; the signal output end of the first fan is connected with the anode of the second diode, and the signal output end of the second fan is connected with the anode of the third diode; the cathode of the second diode is connected with the base electrode of the second triode, and the cathode of the third diode is connected with the base electrode of the third triode; the emitting electrodes of the second triode and the third triode are connected with the signal feedback port; the emitting electrodes of the second triode and the third triode are also connected with one end of a third resistor; the signal feedback port is also connected with the other end of the second thermistor; one end of the first capacitor is connected with the anode of the second diode, and the other end of the first capacitor is grounded; one end of the second capacitor is connected with the anode of the third diode, and the other end of the second capacitor is grounded.
9. The intelligent transformer temperature control system of claim 6, wherein: and dust screens are fixed on the sides, away from the shell, of the first fan and the second fan.
10. The intelligent transformer temperature control system of claim 9, wherein: the dust screen is made of a circular metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921356497.5U CN210488340U (en) | 2019-08-20 | 2019-08-20 | Intelligent temperature control system for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921356497.5U CN210488340U (en) | 2019-08-20 | 2019-08-20 | Intelligent temperature control system for transformer |
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| Publication Number | Publication Date |
|---|---|
| CN210488340U true CN210488340U (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921356497.5U Active CN210488340U (en) | 2019-08-20 | 2019-08-20 | Intelligent temperature control system for transformer |
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| CN (1) | CN210488340U (en) |
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- 2019-08-20 CN CN201921356497.5U patent/CN210488340U/en active Active
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