CN106353476B - For solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance - Google Patents
For solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance Download PDFInfo
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Abstract
A kind of signal pickup assembly for being used to solve transformer winding material temperature-coefficient of electrical resistance.It includes voltage signal detection circuit, current signal detection circuit, temperature sensing circuit, A/D convertor circuit and microcontroller.Advantageous effect provided by the present invention for the signal pickup assembly for solving transformer winding material temperature-coefficient of electrical resistance：Transformer winding material can be carried out non-destructive testing, it can so facilitate operation maintenance personnel in transformer detection to being investigated using the transformer of poor material, important technology support is provided for the networking detection of power distribution network transformer, simultaneously also corresponding criterion is provided to establish the mechanism of permitting the entrance of power distribution network transformer, also accident potential is early found for the transformer in being currently running, ensure that the safe and reliable operation of power grid provides important references, be of great significance and economic benefit.
Description
Technical field
The invention belongs to the verification detection device technology fields of power equipment, are used to solve transformer more particularly to one kind
The signal pickup assembly of winding material temperature-coefficient of electrical resistance.
Background technology
, it is necessary to which the substantial amounts of number of application or analog circuit are treated the number of accepting and believing and adopted in modern electrical measurement technology
Collection, these technologies are known as numerical model analysis acquisition technique by systematization.In modern signal acquisition system, digital circuit is often used
With the sample circuit that analog circuit is combined, such circuit tool there are one it is universal the characteristics of, i.e., at least all there are one simulation letters
Number input, the input of control signal and an analog signal output.The effect of the circuit is in some defined reception
Input voltage, and the voltage is kept until next time, sampling started in output terminal.Sample circuit usually by an analog switch,
The same circuitry phase that one holding capacitor and a unit gain are 1 is formed.Sampling operation is the two of sample states and hold mode
One of kind state.Under sample states, switch connection, the level change of its trace simulation input signal as quickly as possible, until
Keep the arrival of signal；In the hold state, switch disconnects, and tracking process stops, it is always maintained at inputting before switch-off
The instantaneous value of signal.Such sample circuit can accurately collect required every signal, and be communicated to immediately default
Logging modle, thus complete the immediately identifying to transformer winding.
Meanwhile non-destructive testing technology is built upon a comprehensive, application skill on the basis of modern signal acquisition technique
Art.It is not premised on destroying measurand internal structure and ensure practical performance, the method for Applied Physics and chemistry, to tested
Inside object or the physical property on surface, state characteristic are detected, and so as to judge whether measurand is qualified, and then evaluate it
Other characteristics such as applicability, reliability.Tens hundreds of lossless detection methods currently have been developed, wherein with material electromagnetic performance
Change as basis for estimation, a kind of method to implement defects detection and performance test to material and component is referred to as electromagnetic detection skill
Art.It using electromagnetism basic principle as theoretical foundation, mainly including eddy-current method, magnetic particle method, leakage method, microwave method, current disturbing method,
Barkhausen Noise, magnetic memory method, Terahertz method, electromagnetic acoustic method and vortex thermal imaging method etc..Aeronautics and Astronautics, railway, core
The fast development in the fields such as electricity, new material had both provided good opportunity for non-destructive testing, while also proposed great challenge.
Take a broad view both at home and abroad, transient state formula Electromagnetic Testing Technology is a kind of non-destructive testing technology most with prospects, have detection speed it is fast,
The advantages such as depth is big, high sensitivity, frequency spectrum is wide, easily quantifies, play very heavy in the check and evaluation of metal and composite material
The role wanted.Pulsed eddy current testing technology belongs to one kind in transient state formula Electromagnetic Testing Technology, core for vortex pulse heat into
As detection technique, the following characteristics of the technology are mainly used in the non-destructive testing of for transformer winding material：
1) by the influence of contrast material attribute impulse eddy current time domain and frequency domain response signal, different materials magnetic is reflected
The characteristic value of conductance and electrical conductivity, can not only distinguish the composition of different materials, but also solves typical case in multiple material and structure and lack
Sunken check and evaluation problem.The technology extracts the spy that can characterize material electric conductivity and magnetic conductivity (magnetic field intensity) from time domain response
Value indicative, using can characterize stress variation of the characteristic value to metal material of material electric conductivity, the lamination defect in composite material and
Corrosion default in metal structure has carried out detect and assess.
2) by the time-frequency domain response of analysis directions pulse eddy current sensor, obtain to characterize the spy of depth location information
Value indicative, it is suppressed that lift-off and the negative effect of lamellar spacing solve the classification and identification of defect in multilayered structure.Utilization orientation
Property pulse eddy current sensor, the shadow that lift-off and lamellar spacing in multilayered structure are used for the type characteristic value defect classification can be analyzed
It rings.
Another technology be infrared thermal wave NDT technology, it the advantages of have：Non-contact, detection speed is fast, by song
Rate influence is small, suitable for most of material, becomes a very promising non-destructive testing new technology.But since early period lacks
Weary home equipment, and import equipment is expensive, in addition lack using standard, the popularization and application of infrared thermal wave technology receive certain
Limitation, user is substantially in high-end fields such as Aeronautics and Astronautics.
In addition to above according to electromagnetic detection and infrared detection method, directly transformer is determined using electrical quantities measurement method
Internal structure and fault diagnosis are also feasible.Return voltage method (Recovery Voltage Measurement, RVM) is one
Lossless formula that kind proposes recently, can carrying out state-detection to transformer on the premise of transformer solid insulation is not destroyed is examined
Survey means.Its major advantage is to be not required to sample insulating oil or insulating paper, i.e., using insulating materials at a dc voltage
Polarization characteristic, measurement obtain return voltage curve and parameter, and pass through the curve measured and parameter to insulating paper make moist and
The overall status of aging makes diagnosis, can be conveniently used in on-the-spot test.
The content of the invention
To solve the above-mentioned problems, it is an object of the invention to provide one kind for solving transformer winding material resistance temperature
Spend the signal pickup assembly of coefficient.
In order to achieve the above object, provided by the present invention for the signal of solution transformer winding material temperature-coefficient of electrical resistance
Harvester includes：Voltage signal detection circuit, current signal detection circuit, temperature sensing circuit, A/D convertor circuit and micro-control
Device processed, wherein：The input terminal of voltage signal detection circuit is connected with voltage sensor, the first of output terminal and A/D convertor circuit
Analog input end connects, and the input terminal of current signal detection circuit is connected with current sensor, output terminal and A/D convertor circuit
The second analog input end connection；The output terminal of temperature sensing circuit and the 3rd of A/D convertor circuit the defeated simulate connect into end, AD
The digital output end of conversion circuit is connected with microcontroller.
The voltage sensor is the voltage transformer being installed in parallel at transformer winding both ends, for detecting transformer
The phase voltage signal of winding.
The current sensor is the current transformer being connected on transformer winding circuit, for detect transformer around
The current signal of group.
The A/D convertor circuit be the analog to digital conversion circuit at least three road analog input ends, model AD7656.
The model MB91F467DA of the microcontroller.
The voltage signal detection circuit and current signal detection circuit are analog signal input circuit, including：The
One resistance R33, second resistance R34,3rd resistor R35, the 4th resistance R14, the first capacitance C29, the second capacitance C30, the 3rd electricity
Hold C108, the 4th capacitance C109, the 5th capacitance C55 and the first amplifier D7；
Wherein：One end of first resistor R33 is connected with input signal end Id, the other end is connected with the first ground terminal, and second
One end of resistance R34 is connected with input signal end Id, the other end passes through 3rd resistor R35 and the in-phase input end of the first amplifier D7
Connection, one end of the 4th resistance R14 is connected with the output terminal of the first amplifier D7, the other end is connected with the output terminal I1 of this circuit,
First capacitance C29 one end is connected with the tie point of second resistance R34 and 3rd resistor R35, the other end and the first ground terminal connect
It connects, one end of the second capacitance C30 is connected with the in-phase input end of the first amplifier D7, the other end is connected with the first ground terminal, the 3rd
One end of capacitance C108 is connected with the positive power source terminal of the first amplifier D7, the other end is connected with the first ground terminal, the 4th capacitance C109
One end be connected with the negative power end of the first amplifier D7, the other end is connected with the first ground terminal, one end of the 5th capacitance C55 and this
The output terminal I1 connections of circuit, the other end are connected with the first ground terminal, and the positive power source terminal of the first amplifier D7 is connected with power supply+12V,
The negative power end of first amplifier D7 is connected with power supply -12V.
The temperature sensing circuit includes：5th resistance R41, the 6th resistance R42, the 7th resistance R43, the 8th resistance
R44, the 9th resistance R45, the tenth resistance R46, the 11st resistance R47, the 12nd resistance R48, the first potentiometer VR41, the second electricity
Position device VR42, the 6th capacitance C41, the 7th capacitance C42, the 8th capacitance C43, the 9th capacitance C44, zener diode D41, three ends are steady
Depressor U46, the second amplifier D8 and thermistor RT；
Wherein：One end of 5th resistance R41 is connected with the K ends of three terminal regulator U46, the 2 of the other end and thermistor RT
End connection, one end of the 6th resistance R42 is connected with the sliding end of the second potentiometer VR42, the K of the other end and three terminal regulator U46
End connection, one end of the 7th resistance R43 is connected with 2 ends of thermistor RT, the in-phase input end of the other end and the second amplifier D8
Connection, one end of the 8th resistance R44 is connected with the sliding end of the second potentiometer VR42, the reverse phase of the other end and the second amplifier D8 is defeated
Enter end connection, one end of the 9th resistance R45 is connected with the in-phase input end of the second amplifier D8, the other end passes through the 6th capacitance C41
It is connected with+12V power supplys, one end of the tenth resistance R46 is connected with the inverting input of the second amplifier D8, the other end and the second amplifier
The output terminal connection of D8, one end of the 11st resistance R47 is connected with the output terminal of the second amplifier D8, the other end and this detection circuit
Output terminal W1 connections, one end of the 12nd resistance R48 is connected with the K ends of three terminal regulator U46, the other end and+12V power supplys connect
It connects, two fixing ends of the first potentiometer VR41 are connected respectively with the K ends of three terminal regulator U46 and the second ground terminal,
The sliding end of one potentiometer VR41 is connected with the R ends of three terminal regulator U46, a fixing end and temperature-sensitive of the second potentiometer VR42
The 1 end connection of resistance RT, another fixing end are connected with the sliding end of itself, one end and the second amplifier of the 8th capacitance C43
The inverting input connection of D8, the other end are connected with the second ground terminal, one end of the 7th capacitance C42 and the output of this detection circuit
End W1 connections, the other end are connected with the second ground terminal, and one end of the 9th capacitance C44 and the in-phase input end of the second amplifier D8 connect
Connect, the other end is connected with the second ground terminal, the cathode of zener diode D41 is connected with the output terminal W1 of this detection circuit, anode
Be connected with the second ground terminal, the A ends of three terminal regulator U46 are connected with the second ground terminal, the positive power source terminal of the second amplifier D8 with+
The connection of 12V power supplys, negative power end are connected with the second ground terminal, and 1 end of thermistor RT is connected with the second ground terminal.
Thermistor RT on the temperature sensing circuit is the temperature sensing device in transformer winding, for examining
Survey the temperature information of transformer winding, model pt100.
Beneficial effect provided by the present invention for the signal pickup assembly for solving transformer winding material temperature-coefficient of electrical resistance
Fruit：Transformer winding material can be carried out non-destructive testing, can so facilitate operation maintenance personnel in transformer detection to using
The transformer of poor material is investigated, and is provided important technology support for the networking detection of power distribution network transformer, while is also to build
The mechanism of permitting the entrance of vertical power distribution network transformer provides corresponding criterion, also early finds accident potential for the transformer in being currently running,
Ensure that the safe and reliable operation of power grid provides important references, be of great significance and economic benefit.
Description of the drawings
Fig. 1 is to be formed provided by the present invention for solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance
Block diagram；
Fig. 2 is voltage and current signal deteching circuit schematic diagram in this signal pickup assembly；
Fig. 3 is temperature sensing circuit schematic diagram in this signal pickup assembly.
Specific embodiment
Coil-block of transformer and heat-transfer character follow certain physics law, such as when temperature changes 1 degree, winding resistance
Can be ppm/ DEG C (i.e. 10-6/ DEG C) with temperature respective change, unit, this variation tendency can be retouched with temperature-coefficient of electrical resistance
It states, and conductive characteristic that different conductive materials is presented at different temperatures is different, but it is unrelated with the characteristics such as the shape of conductor,
Conductor self-conductance rate has very close relationship with its temperature, by being measured to resistance of the conductor in different temperatures,
So as to determine its temperature-coefficient of electrical resistance, here it is the basic principles of temperature-coefficient of electrical resistance method of testing institute foundation.Such as 1 institute of table
Show, using temperature-coefficient of electrical resistance, typical conductive material resistance is measured, corresponding material can be drawn according to circuit Ohm's law
Expect characteristic, similarly, thermal conductivity factor can also be obtained using similar approach.Acquisition is carried out to the corresponding signal of above-mentioned physical process,
And analyze its changing rule and just can further obtain the parameter of corresponding windings, and then realize the non-destructive testing to transformer winding.
The normal temperature resistance and temperature coefficient of 1 unlike material of table
In the following with reference to the drawings and specific embodiments to provided by the present invention for solving transformer winding material resistance temperature
The signal pickup assembly of coefficient is described in detail.
As shown in Figure 1, it is filled provided by the present invention for the signal acquisition for solving transformer winding material temperature-coefficient of electrical resistance
Put including：
Voltage signal detection circuit 1, current signal detection circuit 2, temperature sensing circuit 3, A/D convertor circuit 4 and microcontroller
Device 5, wherein：The input terminal of voltage signal detection circuit 1 is connected with voltage sensor, the of output terminal and A/D convertor circuit 4
One analog input end connects, and the input terminal of current signal detection circuit 2 is connected with current sensor, output terminal and AD conversion are electric
The second analog input end connection on road 4；The output terminal of temperature sensing circuit 3 connects with the 3rd of A/D convertor circuit 4 the defeated simulate into end
It connects, the digital output end of A/D convertor circuit 4 is connected with microcontroller 5.
The voltage sensor is the voltage transformer being installed in parallel at transformer winding both ends, for detecting transformer
The phase voltage signal of winding.
The current sensor is the current transformer being connected on transformer winding circuit, for detect transformer around
The current signal of group.
The A/D convertor circuit 4 be the analog to digital conversion circuit at least three road analog input ends, model AD7656.
The model MB91F467DA of the microcontroller 5.
As shown in Fig. 2, the voltage signal detection circuit 1 and current signal detection circuit 2 are analog signal input electricity
Road, including：First resistor R33, second resistance R34,3rd resistor R35, the 4th resistance R14, the first capacitance C29, the second electricity
Hold C30, the 3rd capacitance C108, the 4th capacitance C109, the 5th capacitance C55 and the first amplifier D7；
Wherein：One end of first resistor R33 is connected with input signal end Id, the other end is connected with the first ground terminal, and second
One end of resistance R34 is connected with input signal end Id, the other end passes through 3rd resistor R35 and the in-phase input end of the first amplifier D7
Connection, one end of the 4th resistance R14 is connected with the output terminal of the first amplifier D7, the other end is connected with the output terminal I1 of this circuit,
First capacitance C29 one end is connected with the tie point of second resistance R34 and 3rd resistor R35, the other end and the first ground terminal connect
It connects, one end of the second capacitance C30 is connected with the in-phase input end of the first amplifier D7, the other end is connected with the first ground terminal, the 3rd
One end of capacitance C108 is connected with the positive power source terminal of the first amplifier D7, the other end is connected with the first ground terminal, the 4th capacitance C109
One end be connected with the negative power end of the first amplifier D7, the other end is connected with the first ground terminal, one end of the 5th capacitance C55 and this
The output terminal I1 connections of circuit, the other end are connected with the first ground terminal, and the positive power source terminal of the first amplifier D7 is connected with power supply+12V,
The negative power end of first amplifier D7 is connected with power supply -12V.
For voltage signal detection circuit 1, the input signal end Id is connected with voltage sensor, output terminal I1 and AD
The first analog input end connection of conversion circuit 4；For current signal detection circuit 2, the input signal end Id and electric current
Sensor connection, output terminal I1 are connected with the second analog input end of A/D convertor circuit 4.
As shown in figure 3, the temperature sensing circuit 3 includes：5th resistance R41, the 6th resistance R42, the 7th resistance
R43, the 8th resistance R44, the 9th resistance R45, the tenth resistance R46, the 11st resistance R47, the 12nd resistance R48, the first current potential
Device VR41, the second potentiometer VR42, the 6th capacitance C41, the 7th capacitance C42, the 8th capacitance C43, the 9th capacitance C44, voltage stabilizing two
Pole pipe D41, three terminal regulator U46, the second amplifier D8 and thermistor RT；
Wherein：One end of 5th resistance R41 is connected with the K ends of three terminal regulator U46, the 2 of the other end and thermistor RT
End connection, one end of the 6th resistance R42 is connected with the sliding end of the second potentiometer VR42, the K of the other end and three terminal regulator U46
End connection, one end of the 7th resistance R43 is connected with 2 ends of thermistor RT, the in-phase input end of the other end and the second amplifier D8
Connection, one end of the 8th resistance R44 is connected with the sliding end of the second potentiometer VR42, the reverse phase of the other end and the second amplifier D8 is defeated
Enter end connection, one end of the 9th resistance R45 is connected with the in-phase input end of the second amplifier D8, the other end passes through the 6th capacitance C41
It is connected with+12V power supplys, one end of the tenth resistance R46 is connected with the inverting input of the second amplifier D8, the other end and the second amplifier
The output terminal connection of D8, one end of the 11st resistance R47 is connected with the output terminal of the second amplifier D8, the other end and this detection circuit
Output terminal W1 connections, one end of the 12nd resistance R48 is connected with the K ends of three terminal regulator U46, the other end and+12V power supplys connect
It connects, two fixing ends of the first potentiometer VR41 are connected respectively with the K ends of three terminal regulator U46 and the second ground terminal,
The sliding end of one potentiometer VR41 is connected with the R ends of three terminal regulator U46, a fixing end and temperature-sensitive of the second potentiometer VR42
The 1 end connection of resistance RT, another fixing end are connected with the sliding end of itself, one end and the second amplifier of the 8th capacitance C43
The inverting input connection of D8, the other end are connected with the second ground terminal, one end of the 7th capacitance C42 and the output of this detection circuit
End W1 connections, the other end are connected with the second ground terminal, and one end of the 9th capacitance C44 and the in-phase input end of the second amplifier D8 connect
Connect, the other end is connected with the second ground terminal, the cathode of zener diode D41 is connected with the output terminal W1 of this detection circuit, anode
Be connected with the second ground terminal, the A ends of three terminal regulator U46 are connected with the second ground terminal, the positive power source terminal of the second amplifier D8 with+
The connection of 12V power supplys, negative power end are connected with the second ground terminal, and 1 end of thermistor RT is connected with the second ground terminal.
The output terminal W1 of the temperature sensing circuit 3 is connected with the 3rd analog input end of A/D convertor circuit 4.
Thermistor RT on the temperature sensing circuit 3 is the temperature sensing device in transformer winding, is used for
Detect the temperature information of transformer winding, model pt100.
Now work provided by the present invention for solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance
Principle is described below：Utilize the phase voltage of the transformer winding of 1 real-time collection voltages sensor of voltage signal detection circuit detection
Signal；Gather the current signal of the transformer winding of current sensor detection in real time using current signal detection circuit 2；Profit simultaneously
It gathers the temperature information of the transformer winding of thermistor RT detections in real time with temperature sensing circuit 3, is then respectively transmitted to AD
The analog quantity voltage, electric current and temperature signal of above-mentioned input are converted into digital quantity by conversion circuit 4 by A/D convertor circuit 4 afterwards
Signal simultaneously sends microcontroller 5 to；Microcontroller 5 is according to the linear functional relation between temperature and resistance (voltage, electric current)
The temperature-coefficient of electrical resistance of transformer winding, and then the material for assessing transformer winding can be obtained.
Claims (3)
- It is described for solving transformation 1. a kind of for solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance The signal pickup assembly of device winding material temperature-coefficient of electrical resistance includes：Voltage signal detection circuit (1), current signal detection circuit (2), temperature sensing circuit (3), A/D convertor circuit (4) and microcontroller (5), wherein：The input of voltage signal detection circuit (1) End is connected with voltage sensor, the first analog input end of output terminal and A/D convertor circuit (4) be connected, and current signal detects electric The input terminal on road (2) is connected with current sensor, the second analog input end of output terminal and A/D convertor circuit (4) is connected；Temperature The output terminal of degree detection circuit (3) is connected with the 3rd analog input end of A/D convertor circuit (4), the number of A/D convertor circuit (4) Output terminal is connected with microcontroller (5)；It is characterized in that：The voltage signal detection circuit (1) and current signal detection circuit (2) are analog signal input electricity Road, including：First resistor R33, second resistance R34,3rd resistor R35, the 4th resistance R14, the first capacitance C29, the second electricity Hold C30, the 3rd capacitance C108, the 4th capacitance C109, the 5th capacitance C55 and the first amplifier D7；Wherein：One end of first resistor R33 is connected with input signal end Id, the other end is connected with the first ground terminal, second resistance One end of R34 is connected with input signal end Id, the other end is connected by the in-phase input end of 3rd resistor R35 and the first amplifier D7 It connecing, one end of the 4th resistance R14 is connected with the output terminal of the first amplifier D7, the other end is connected with the output terminal I1 of this circuit, the One capacitance C29 one end is connected with the tie point of second resistance R34 and 3rd resistor R35, the other end is connected with the first ground terminal, One end of second capacitance C30 is connected with the in-phase input end of the first amplifier D7, the other end is connected with the first ground terminal, the 3rd capacitance One end of C108 is connected with the positive power source terminal of the first amplifier D7, the other end is connected with the first ground terminal, and the one of the 4th capacitance C109 End is connected with the negative power end of the first amplifier D7, the other end is connected with the first ground terminal, one end and this circuit of the 5th capacitance C55 Output terminal I1 connections, the other end be connected with the first ground terminal, the positive power source terminal of the first amplifier D7 is connected with power supply+12V, first The negative power end of amplifier D7 is connected with power supply -12V.
- 2. it is according to claim 1 for solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance, It is characterized in that：The temperature sensing circuit (3) includes：5th resistance R41, the 6th resistance R42, the 7th resistance R43, the 8th electricity Hinder R44, the 9th resistance R45, the tenth resistance R46, the 11st resistance R47, the 12nd resistance R48, the first potentiometer VR41, second Potentiometer VR42, the 6th capacitance C41, the 7th capacitance C42, the 8th capacitance C43, the 9th capacitance C44, zener diode D41, three ends Voltage-stablizer U46, the second amplifier D8 and thermistor RT；Wherein：One end of 5th resistance R41 is connected with the K ends of three terminal regulator U46,2 ends of the other end and thermistor RT connect It connects, one end of the 6th resistance R42 is connected with the sliding end of the second potentiometer VR42, the K ends of the other end and three terminal regulator U46 connect It connecing, one end of the 7th resistance R43 is connected with 2 ends of thermistor RT, the other end is connected with the in-phase input end of the second amplifier D8, One end of 8th resistance R44 is connected with the sliding end of the second potentiometer VR42, the inverting input of the other end and the second amplifier D8 Connection, one end of the 9th resistance R45 is connected with the in-phase input end of the second amplifier D8, the other end by the 6th capacitance C41 and+ 12V power supplys connect, and one end of the tenth resistance R46 is connected with the inverting input of the second amplifier D8, the other end and the second amplifier D8 Output terminal connection, one end of the 11st resistance R47 is connected with the output terminal of the second amplifier D8, the other end and this detection circuit Output terminal W1 connections, one end of the 12nd resistance R48 is connected with the K ends of three terminal regulator U46, the other end connects with+12V power supplys It connects, two fixing ends of the first potentiometer VR41 are connected respectively with the K ends of three terminal regulator U46 and the second ground terminal, The sliding end of one potentiometer VR41 is connected with the R ends of three terminal regulator U46, a fixing end and temperature-sensitive of the second potentiometer VR42 The 1 end connection of resistance RT, another fixing end are connected with the sliding end of itself, one end and the second amplifier of the 8th capacitance C43 The inverting input connection of D8, the other end are connected with the second ground terminal, one end of the 7th capacitance C42 and the output of this detection circuit End W1 connections, the other end are connected with the second ground terminal, and one end of the 9th capacitance C44 and the in-phase input end of the second amplifier D8 connect Connect, the other end is connected with the second ground terminal, the cathode of zener diode D41 is connected with the output terminal W1 of this detection circuit, anode Be connected with the second ground terminal, the A ends of three terminal regulator U46 are connected with the second ground terminal, the positive power source terminal of the second amplifier D8 with+ The connection of 12V power supplys, negative power end are connected with the second ground terminal, and 1 end of thermistor RT is connected with the second ground terminal.
- 3. it is according to claim 2 for solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance, It is characterized in that：Thermistor RT on the temperature sensing circuit (3) is the temperature sensing device in transformer winding, is used In the temperature information of detection transformer winding, model pt100.
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