CN206593781U - Being taken for 10kV switch ring main unit electric field inductions can temperature measuring equipment - Google Patents

Abstract

One kind is used for 10kV switch ring main unit electric field inductions and takes energy temperature measuring equipment, including casing, and be encapsulated in taking for casing internal can circuit, main power supply circuit, wireless sending module, temperature detecting module, control circuit, the main power supply circuit is connected with wireless sending module, to provide operating voltage for wireless sending module, the temperature detecting module is connected with wireless sending module, sent with the temperature data for detecting temperature detecting module by wireless sending module, the control circuit is arranged between the electrode input end of main power supply circuit and the output end for taking energy circuit, with the batch (-type) control that main power supply circuit is cut off or turned on, on the one hand the technical solution of the utility model uses super low-power consumption voltage comparator, the wireless module of super low-power consumption bluetooth 4.2 causes the quiescent dissipation of temperature measuring equipment to reach minimum, on the other hand because this take can control circuit to cut off load in static system, so that system power dissipation is further reduced.

Description

Being taken for 10kV switch ring main unit electric field inductions can temperature measuring equipment

Technical field

The utility model is related to temperature monitoring technique field in power system, more particularly to a kind of 10kV that is used for switchs looped network Cabinet electric field induction takes can temperature measuring equipment.

Background technology

In the patent of Application No. 2012104106839, the disconnecting switch contact that a kind of use electric field induction is powered is disclosed Temperature online is measured and radio transmitting device, and the sensor circuit of the patent includes high voltage electric field induction energy fetching circuit, pulsed discharge Circuit, temperature survey and wireless transmission circuit.

Energy storage and control circuit in the patent are stored up by semiconductor switch, decompression pulse transformer, diode and Large Copacity Energy electric capacity is constituted, and its volume is big, power consumption is high, and the control circuit further increases energy consumption, institute in long-term conducting state The power system of 110kV and above can only be limited to the device, and the energy that electric field induction is obtained is relatively Big occasion.

The content of the invention

It is necessary to propose that a kind of small volume, energy consumption be low, intermittent intelligent control, being used for for 10kV voltage class 10kV switch ring main unit electric field inductions take can temperature measuring equipment.

One kind be used for 10kV switch ring main unit electric field inductions take can temperature measuring equipment, including casing and be encapsulated in casing internal Take can circuit, main power supply circuit, wireless sending module, temperature detecting module, control circuit, the casing suspends and is fixed on electricity The high-pressure side of the line of force, the bottom plate of casing is metal induction plate, it is described take can circuit an input and the power line High-pressure side is connected, and is taken another input of energy circuit to be connected with the metal induction plate, is taken two output ends of energy circuit It is connected respectively with the electrode input end and negative input of main power supply circuit, the main power supply circuit connects with wireless sending module Connect, operating voltage is provided for wireless sending module, the thermometric end of the temperature detecting module passes through the casing with close to electric power Line, the temperature for detecting power line, the temperature detecting module is connected with wireless sending module, temperature detecting module is examined The temperature data measured is sent by wireless sending module, and the control circuit is arranged on the positive pole input of main power supply circuit Between the output end for holding and taking energy circuit, controlled with the batch (-type) that main power supply circuit is cut off or turned on.

It is preferred that, the control circuit includes voltage comparator circuit, auxiliary power supply circuit, main switch circuit, the auxiliary Power supply circuit includes voltage follower, supplying resistance divider, power supply capacitor, and supplying resistance divider will take the output of energy circuit Voltage carries out partial pressure, and the voltage follower follows the voltage after supplying resistance voltage divider, and by the voltage clamp after partial pressure Position to the power supply capacitor, the power supply capacitor provides the operating voltage of the voltage comparator circuit, the voltage comparator circuit Including voltage comparator, first resistor divider, second resistance divider, the voltage comparator includes power input, base Quasi- voltage output end, negative input end, positive input terminal, control output end, the power input are connected with the power supply capacitor, base Quasi- voltage output end connects first resistor divider, and first resistor divider connection negative input end will be by first resistor point Control source after depressor partial pressure is to negative input end, and second resistance divider connects the power supply capacitor, and the positive input terminal connects Connect the second resistance divider, by the control source after second resistance voltage divider to positive input terminal, the control Output end processed connects the main switch circuit, and the main switch circuit is connected to the output end and main power supply circuit for taking energy circuit Between input, controlled with the batch (-type) that main power supply circuit is cut off or turned on by main switch circuit.

It is preferred that, the first resistor divider includes the first resistor, second resistance, the 3rd electricity being sequentially connected in series Resistance, the resistance of 3rd resistor is much larger than the resistance of first, second resistance, the voltage after second resistance and 3rd resistor partial pressure Input to the negative input end of the voltage comparator.

It is preferred that, the voltage comparator circuit also includes first switch, and first switch is a MOSFET, the grid of first switch Pole is connected with the control output end of the voltage comparator, the source ground of first switch, and the drain electrode of first switch is connected to Between two resistance and 3rd resistor, so that after first switch conducting, 3rd resistor short circuit over the ground.

It is preferred that, the voltage comparator circuit also includes second switch and discharge resistance, and second switch is a MOSFET, the The grid of two switches is connected with the control output end of the voltage comparator, the source ground of second switch, the leakage of second switch Pole is connected between power supply capacitor and the power input of voltage comparator by discharge resistance, to be controlled by discharge resistance The time of power supply capacitor electric discharge so that power supply capacitor long period powers for comparator.

It is preferred that, the voltage comparator circuit also includes 3rd resistor divider, and 3rd resistor divider includes the 8th electricity Resistance and the 9th resistance, the resistance of the 9th resistance are more than the resistance of the 8th resistance, so that the voltage after the 9th electric resistance partial pressure is small The voltage exported in control output end, the grid of the first switch and the grid of second switch are connected to the 8th resistance and the 9th Between resistance, so that the grid of first switch and the cut-in voltage of grid of second switch can be when comparator supply voltage be relatively low Abnormal high level of output will not be switched it on, and it can be turned on well when comparator normally exports high level.

It is preferred that, the auxiliary power supply circuit also includes a diode, and the diode is connected to power supply capacitor and electricity Between pressure follower.

It is preferred that, it is described to take energy circuit to include rectifier bridge and storage capacitor, described one input of rectifier bridge and the electricity The high-pressure side connection of the line of force, another input of rectifier bridge is connected with the metal induction plate, two outputs of rectifier bridge The end connection storage capacitor, the two ends of the storage capacitor connect electrode input end and the negative input company of main power supply circuit Connect.

It is preferred that, the main power supply circuit includes positive wire, cathode conductor, linear voltage regulator, and positive wire is connected to Between storage capacitor and linear voltage regulator, cathode conductor ground connection, the wireless sending module includes bluetooth module, temperature detection mould Block is a temperature sensor.

The beneficial effects of the utility model are：

1st, the cleverly design of voltage hysteresis loop comparator, is coordinating three electric discharge switch mosfets, is realizing switch looped network Cabinet high voltage electric field induction energy fetching temperature measurement node total system job control, is powered by collecting electric field induction energy for whole device, The function of temperature survey and wireless transmission is completed, the low static power consumption of whole device and making full use of for electric energy is realized, this Do not occurred in current switch ring main unit temperature measuring equipment control circuit.

2nd, it is this it is simple control circuit be applied to any capacitance energy storage work system, advantageously reduce system power consumption and Realize that storage capacitor is substantially discharged.

3rd, the technical solution of the utility model is on the one hand using super low-power consumption voltage comparator, the nothing of super low-power consumption bluetooth 4.2 Wire module causes the quiescent dissipation of temperature measuring equipment to reach minimum, on the other hand because this take can control circuit in static system Cut-out load so that system power dissipation is further reduced, this just brings very big advantage for high voltage electric field induction energy fetching mode, i.e., The energy of system need of work can be just obtained within the identical time with the induction plate of small area, due to this high pressure Electric field induction, which takes, can survey temperature control circuit so that switch ring main unit temperature measuring equipment volume has accomplished very little.

Brief description of the drawings

Fig. 1 is to switch the circuit diagram that ring main unit electric field induction takes energy temperature measuring equipment for 10kV.

In figure：Power line 10, metal induction plate 20, take can circuit 30, main power supply circuit 40, positive wire 41, negative pole Wire 42, linear voltage regulator 43, wireless sending module 50, temperature detecting module 60, control circuit 70, voltage comparator circuit 71, Voltage comparator 711, auxiliary power supply circuit 72.

Embodiment

In order to illustrate more clearly of the technical scheme of the utility model embodiment, it will use below required in embodiment Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the present utility model, for this For the those of ordinary skill of field, on the premise of not paying creative work, it can also obtain other according to these accompanying drawings Accompanying drawing.

Referring to Fig. 1, the utility model embodiment provides a kind of 10kV switch ring main unit electric field inductions that are used for and takes energy thermometric Device, including casing and be encapsulated in casing internal take can circuit 30, main power supply circuit 40, wireless sending module 50, temperature inspection Module 60, control circuit 70 are surveyed, casing, which suspends, is fixed on the high-pressure side of power line 10, and the bottom plate of casing is metal induction plate 20, take an input of energy circuit 30 to be connected with the high-pressure side of power line 10, take another input and gold of energy circuit 30 Category induction plate 20 is connected, and takes electrode input end and negative pole of two output ends of energy circuit 30 respectively with main power supply circuit 40 defeated Enter end connection, main power supply circuit 40 is connected with wireless sending module 50, to provide operating voltage, temperature for wireless sending module 50 The thermometric end of detection module 60 is through casing with close to power line 10, the temperature for detecting power line 10, temperature detecting module 60 are connected with wireless sending module 50, and the temperature data that temperature detecting module 60 is detected is sent out by wireless sending module 50 See off, control circuit 70 is arranged between the electrode input end of main power supply circuit 40 and the output end for taking energy circuit 30, with right The batch (-type) control that main power supply circuit 40 is cut off or turned on.

In the utility model, when static, in the stage that whole control circuit 70 is closed in main switch circuit MOSFET Q4, bear Load is cut completely through by main switch circuit Q4, is also no electric energy loss, the little by little loss of the chip except controlling circuit 70, Other are not almost lost, so whole system quiescent dissipation is extremely low, charging stable storage capacitor Cs, when voltage reaches necessarily Value comparator export one section of high level, main switch circuit MOSFET Q4 conductings, systems stay work a period of time, wireless hair Module 50 is sent to send the temperature data of temperature detecting module 60 to the secondary control loop digital controller of switch ring main unit In, transformer station's host computer is then sent to by optical fiber again.

Wherein, casing, which suspends, can be understood as that casing and power line 10 are relatively fixed into setting using external connection structure, It need to only ensure between casing and power line 10 at a spacing, and have certain insulation impedance between casing and power line 10, To form the dielectric in the middle of similar capacitor.

Further, control circuit 70 includes voltage comparator circuit 71, auxiliary power supply circuit 72, main switch circuit Q4, auxiliary Power supply circuit 72 includes voltage follower Q3, supplying resistance divider, power supply capacitor C1, and supplying resistance divider will take can circuit 30 output voltage carries out partial pressure, and voltage follower Q3 follows the voltage after supplying resistance voltage divider, and by after partial pressure Voltage clamping provides the operating voltage of voltage comparator circuit 71 to power supply capacitor C1, power supply capacitor C1, and voltage comparator circuit 71 is wrapped Include voltage comparator 711, first resistor divider, second resistance divider, voltage comparator 711 include power input V+, Reference voltage output end REF, negative input end IN-, positive input terminal IN+, control output end OUT, power input V+ and power supply electricity Hold C1 connections, reference voltage output end REF connection first resistor divider, first resistor divider connects negative input end IN-, with By the control source after first resistor voltage divider to negative input end IN-, second resistance divider connection power supply capacitor C1, positive input terminal IN+ connection second resistance divider, by the control source after second resistance voltage divider to just defeated Enter and hold IN+, control output end OUT connections main switch circuit Q4, main switch circuit Q4 be connected to take can circuit 30 output end with Between the input of main power supply circuit 40, with the interval that main power supply circuit 40 is cut off or turned on by main switch circuit Q4 Formula is controlled.

Wherein, the voltage comparator 711 is the comparator of built-in reference voltage.Main switch circuit Q4 is a MOSFET.

Further, first resistor divider includes the first resistor R1, second resistance R2,3rd resistor being sequentially connected in series R3,3rd resistor R3 resistance are more than first resistor R1 resistance, the electricity after second resistance R2 and 3rd resistor R3 partial pressures Pressure is inputted to the negative input end IN- of voltage comparator 711.

For example, 3rd resistor R3 resistance is mega-ohms, first resistor R1 and second resistance R2 resistance are kilo-ohm level, Voltage comparator 711 start working when, comparator set up reference voltage almost all provide to negative input end IN-, as than The first threshold compared compared with device, with the rising of the power supply capacitor C1 voltages provided, the voltage of positive input terminal IN+ inputs, which is more than, to be born During input IN- voltage, control output end OUT output high level, main switch circuit Q4 conductings, taking can power based on circuit 30 Circuit 40, wireless sending module 50 provide operating voltage；After the electrical energy discharge for taking energy circuit 30 to store is finished, power supply capacitor C1 Voltage declines, and voltage comparator 711 is stopped, control output end OUT output low levels, main switch circuit Q4 open circuits, wirelessly The dead electricity of sending module 50 does not work.

Further, voltage comparator circuit 71 also includes first switch Q1, and first switch Q1 is a MOSFET, first switch Q1 Grid be connected with the control output end OUT of voltage comparator 711, first switch Q1 source ground, first switch Q1 leakage Pole is connected between second resistance R2 and 3rd resistor R3, so that after first switch Q1 conductings, 3rd resistor R3 short circuits over the ground.

In order that taking the tension discharge of energy circuit 30 totally thorough, continue also for the wireless sending module 50 for ensureing postorder Work at least 8s, the temperature data collected is sent, it is necessary to keep main switch circuit Q4 ON times to try one's best extension, This requires control output end OUT to keep the output high level of long period, such as at least 8s.

And with the reduction for taking the energy discharge voltage of circuit 30, power supply capacitor C1 voltage is also with reduction, by second resistance Input to positive input terminal IN+ voltage and be gradually lowered after voltage divider, if negative input end IN- voltage is remained in that and base The higher voltage of quasi- voltage identical, such as first threshold so drops to no more than first threshold in positive input terminal IN+ voltage When, comparator can not export high level, so, in order to ensure to compare positive input terminal IN+ and negative in voltage comparator 711 During input IN- voltage, the output high level of comparator still long period is provided with first switch in the technical program Q1, to change the intrinsic standoff ratio of first resistor divider by first switch Q1, by first switch Q1 by 3rd resistor R3 over the ground Short circuit, so that by second resistance R2 partial pressure, the voltage that negative input end IN- is supplied to by reference voltage output end REF be drawn Low, the voltage is referred to as Second Threshold, this reduces the standard compared, even if positive input terminal IN+ voltage continuous decrease, only Positive input terminal IN+ voltage is wanted to be more than the Second Threshold, comparator still exports high level, with lasting holding main switch circuit Q4 Conducting.

Reference voltage as built in the comparator is 1.12V, when 3rd resistor R3 is set to very big, negative input end IN- The voltage of input is also 1.12V, and first threshold is 1.12V, so when taking energy circuit 30 just to start electric discharge, positive input terminal IN + voltage need to be more than 1.12V, control output end OUT could export high level, and one after main switch circuit Q4 conductings In the stage, due to the high level of output, first switch Q1 is turned on, 3rd resistor R3 short circuits, after second resistance R2 partial pressures, and input is negative defeated Enter to hold IN- voltage very little, about 0.2V, this Second Threshold is far below first threshold, so, positive input terminal IN+ voltage Even if dropping below 1.12V, or even drop between 0.2V and 1.12V, can also keep the high level output of a period of time.

Further, voltage comparator circuit 71 also includes second switch Q2 and discharge resistance R10, and second switch Q2 is one MOSFET, second switch Q2 grid are connected with the control output end OUT of voltage comparator 711, and second switch Q2 source electrode connects Ground, second switch Q2 drain electrode is connected to power supply capacitor C1 and voltage comparator 711 power input by discharge resistance R10 Between V+, to elongate the time of power supply capacitor C1 electric discharges by discharge resistance R10 so that power supply capacitor C1 long periods are Comparator is powered.

Supplying resistance divider includes the 6th resistance R6 and the 7th resistance R7, by rationally setting the 6th resistance R6 and the 7th Resistance R7 resistance carries out the A points voltage after partial pressure, partial pressure to be arrived by voltage follower Q3 clampers to storage capacitor Cs voltage Power supply capacitor C1 voltage, the voltage is suitable for the voltage of voltage comparator 711, and second resistance divider includes the 4th of series connection Resistance R4 and the 5th resistance R5, by the resistance and power supply capacitor C1 appearance that rationally set the 4th electricity R4 resistances and the 5th resistance R5 Amount so that time of the input positive input terminal IN+ voltage attenuation to needed for being less than Second Threshold is a longer time, i.e., at least 8s, what this can be achieved on.

Further, voltage comparator circuit 71 also includes 3rd resistor divider, and 3rd resistor divider includes the 8th resistance R8 and the 9th resistance R9, the 9th resistance R9 resistance are more than the 8th resistance R8 resistance, so that after the 9th resistance R9 partial pressures Voltage be slightly less than control output end OUT output voltage, first switch Q1 grid and second switch Q2 grid are connected to Between 8th resistance R8 and the 9th resistance R9 so that first switch Q1 grid and second switch Q2 grid cut-in voltage energy The abnormal high level exported when comparator supply voltage is relatively low will not turn on first switch Q1 and second switch Q2, and When comparator normally exports high level, it can be turned on well.

Because the power supply capacitor C1 of voltage comparator 711 voltage is to take energy circuit by a voltage follower Q3 Voltage on 30, this is the voltage that 9V is gradually increasing from 0, and comparator normal working voltage is generally 2V-9V, that is, Say that comparator supply voltage is more than after 2V, comparator can just set up a reference voltage in reference voltage output end REF, i.e., the One threshold value, such as 1.12V, this reference voltage feed back to the negative input end IN- of comparator so that the storage capacitor Cs charging stages are born Input IN- voltages are more than positive input terminal IN+, comparator output low level always.

But when comparator supply voltage does not also rise to 2V, when such as comparator supply voltage is less than 2V, such as 1.5v, base Quasi- voltage output end REF does not set up a reference voltage also, and first threshold is not set up, now the negative input end of comparator IN- is exactly 0V, then in this stage, and electrode input end has had the voltage of input, and the voltage is naturally larger than 0V, then comparator The voltage of control output end OUT outputs is the voltage of power input V+ inputs, as comparator control output end OUT outputs High level, the high level of output is exactly supply voltage 1.5v.

In the charging stage, this high level is undesirable high level, because first switch Q1 and second switch Q2 is low Press MOSFET, low pressure MOSFET conduction threshold is 0.8-2V, the 1.5v high level of above-mentioned output can make first switch Q1 and the Two switch Q2 mislead, and misleading can cause first threshold to be set up according to default, and charging capacitor can not be charged normal so that Comparator can not work according to the flow of design, so to add a 3rd resistor divider to carry out partial pressure so that comparator is powered Undesirable output high level still is below 0.8V when not enough, so that first switch Q1 and second switch Q2 can not mislead. Switch Q4 is high-voltage switch gear, and conduction threshold is more than 2V, so being not considered.

Further, auxiliary power supply circuit 72 also includes a diode D5, and diode D5 is connected to power supply capacitor C1 and electricity Between pressure follower Q3.

Diode D5 setting causes the power supply capacitor C1 of comparator only to be charged by accumulator, without with energy storage The decline of circuit voltage and decline so that voltage comparator 711 can storage capacitor Cs discharge during continue one section when Between.

Further, energy circuit 30 is taken to include rectifier bridge and storage capacitor Cs, one input of rectifier bridge and power line 10 High-pressure side is connected, and another input of rectifier bridge is connected with metal induction plate 20, two output ends connection storage of rectifier bridge Can electric capacity Cs, the electrode input end of the storage capacitor Cs main power supply circuit 40 of two ends connection and negative input connection.

The diode rectifier bridge that rectifier bridge is made up of diode D1, D2, D3, D4.

Further, main power supply circuit 40 includes positive wire 41, cathode conductor 42, linear voltage regulator 43, positive wire 41 It is connected between storage capacitor Cs and linear voltage regulator 43, cathode conductor 42 is grounded, wireless sending module 50 includes bluetooth module, Temperature detecting module 60 is a temperature sensor.

Switch ring main unit wireless temperature measuring node and data are sent using blue tooth radio network, this is entirely capable of satisfaction one and opened Close the Wireless transceiver distance in ring main unit（2-10 meters）, all temperature measurement nodes use Star Network structure, and all temperature measurement terminals set It is standby, temperature data is sent in switch ring main unit secondary control loop digital controller by blue tooth radio network, then Transformer station's host computer is sent to by optical fiber again.

The utility model just can realize taking and appointing for stabilization using the high voltage electric field induction energy fetching pole plate of a very small volume Business, this control circuit 70 is particularly suitable for switching ring main unit high voltage electric field induction energy fetching temperature measurement circuit, and cost of implementation is low, The realization of whole wireless temperature measurement system function has a very big significance in the automatic detection of switch ring main unit temperature.

Step in the utility model embodiment method can be sequentially adjusted, merged and deleted according to actual needs.

Module or unit in the utility model embodiment device can according to actual needs be merged, divide and deleted Subtract.

Above disclosed is only the utility model preferred embodiment, can not limit the utility model with this certainly Interest field, one of ordinary skill in the art will appreciate that realize all or part of flow of above-described embodiment, and according to this reality The equivalent variations made with new claim, still fall within the scope that utility model is covered.

Claims (9)

1. one kind, which is used for 10kV switch ring main unit electric field inductions, takes energy temperature measuring equipment, it is characterised in that：Including casing and it is encapsulated in Taking for casing internal can circuit, main power supply circuit, wireless sending module, temperature detecting module, control circuit, the casing suspension Be fixed on the high-pressure side of power line, the bottom plate of casing is metal induction plate, it is described take can circuit an input with it is described The high-pressure side connection of power line, takes another input of energy circuit to be connected with the metal induction plate, takes the two of energy circuit Individual output end is connected with the electrode input end and negative input of main power supply circuit respectively, the main power supply circuit and wireless transmission Module is connected, to provide operating voltage for wireless sending module, the thermometric end of the temperature detecting module pass through the casing with Close to power line, the temperature for detecting power line, the temperature detecting module is connected with wireless sending module, temperature is examined The temperature data that survey module is detected is sent by wireless sending module, and the control circuit is arranged on main power supply circuit Between electrode input end and the output end for taking energy circuit, controlled with the batch (-type) that main power supply circuit is cut off or turned on.

2. being used for 10kV switch ring main unit electric field inductions as claimed in claim 1 takes energy temperature measuring equipment, it is characterised in that：It is described Circuit is controlled to include voltage comparator circuit, auxiliary power supply circuit, main switch circuit, the auxiliary power supply circuit includes voltage follow The output voltage for taking energy circuit is carried out partial pressure, the electricity by device, supplying resistance divider, power supply capacitor, supplying resistance divider Pressure follower follows the voltage after supplying resistance voltage divider, and by the voltage clamping after partial pressure to the power supply capacitor, institute The operating voltage that power supply capacitor provides the voltage comparator circuit is stated, the voltage comparator circuit includes voltage comparator, first Resitstance voltage divider, second resistance divider, the voltage comparator include power input, reference voltage output end, negative input End, positive input terminal, control output end, the power input are connected with the power supply capacitor, reference voltage output end connection the One resitstance voltage divider, first resistor divider connection negative input end is defeated by the voltage after first resistor voltage divider Enter to negative input end, second resistance divider connects the power supply capacitor, the positive input terminal connects the second resistance partial pressure Device, by the control source after second resistance voltage divider to positive input terminal, the control output end connects the master On-off circuit, the main switch circuit, which is connected to, to be taken between the energy output end of circuit and the input of main power supply circuit, to pass through The batch (-type) control that main switch circuit is cut off or turned on to main power supply circuit.

3. 10kV switches ring main unit electric field induction as claimed in claim 2 takes energy temperature measuring equipment, it is characterised in that：Described first Resitstance voltage divider includes first resistor, second resistance, the 3rd resistor being sequentially connected in series, and the resistance of 3rd resistor is more than first The resistance of resistance, the negative input end of control source after second resistance and 3rd resistor partial pressure to the voltage comparator.

4. being used for 10kV switch ring main unit electric field inductions as claimed in claim 3 takes energy temperature measuring equipment, it is characterised in that：It is described Voltage comparator circuit also includes first switch, and first switch is a MOSFET, the grid of first switch and the voltage comparator Control output end connection, the source ground of first switch, the drain electrode of first switch be connected to second resistance and 3rd resistor it Between, so that after first switch conducting, 3rd resistor short circuit over the ground.

5. being used for 10kV switch ring main unit electric field inductions as claimed in claim 4 takes energy temperature measuring equipment, it is characterised in that：It is described Voltage comparator circuit also include second switch and discharge resistance, second switch be a MOSFET, the grid of second switch with it is described The control output end connection of voltage comparator, the source ground of second switch, the drain electrode of second switch is connected by discharge resistance Between power supply capacitor and the power input of voltage comparator, with elongated by discharge resistance power supply capacitor electric discharge when Between so that power supply capacitor long period powers for comparator.

6. the 10kV switch ring main unit electric field inductions that are used for as described in claim 4 or 5 take energy temperature measuring equipment, it is characterised in that： The voltage comparator circuit also includes 3rd resistor divider, and 3rd resistor divider includes the 8th resistance and the 9th resistance, the The resistance of nine resistance is more than the resistance of the 8th resistance, so that the voltage after the 9th electric resistance partial pressure is exported less than control output end Voltage, the grid of the first switch and the grid of second switch are connected between the 8th resistance and the 9th resistance, so that It is abnormal that the cut-in voltage of the grid of one switch and the grid of second switch can be exported when comparator supply voltage is relatively low High level will not be switched it on, and it can be turned on well when comparator normally exports high level.

7. being used for 10kV switch ring main unit electric field inductions as claimed in claim 2 takes energy temperature measuring equipment, it is characterised in that：It is described Auxiliary power supply circuit also includes a diode, and the diode is connected between power supply capacitor and voltage follower.

8. being used for 10kV switch ring main unit electric field inductions as claimed in claim 1 takes energy temperature measuring equipment, it is characterised in that：It is described Energy circuit is taken to include rectifier bridge and storage capacitor, described one input of rectifier bridge is connected with the high-pressure side of the power line, whole Another input of stream bridge is connected with the metal induction plate, and two output ends of rectifier bridge connect the storage capacitor, The two ends of the storage capacitor connect electrode input end and the negative input connection of main power supply circuit.

9. being used for 10kV switch ring main unit electric field inductions as claimed in claim 1 takes energy temperature measuring equipment, it is characterised in that：It is described Main power supply circuit includes positive wire, cathode conductor, linear voltage regulator, and positive wire is connected to storage capacitor and linear voltage regulator Between, cathode conductor ground connection, the wireless sending module includes bluetooth module, and temperature detecting module is a temperature sensor.