CN211718337U

CN211718337U - Composite sensor based on current transformer

Info

Publication number: CN211718337U
Application number: CN201922012456.0U
Authority: CN
Inventors: 王云山; 杨志强
Original assignee: ZHUHAI YADO MONITORING TECHNOLOGY CO LTD
Current assignee: ZHUHAI YADO MONITORING TECHNOLOGY CO LTD
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-10-20
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a compound sensor based on current transformer, include: the temperature measuring and sensing device comprises an upper shell, a lower shell, an upper magnetic core, a lower magnetic core, a coil, a main control board and a temperature measuring and electrified sensing probe; one side of the upper shell is hinged with one side of the lower shell, a fastening piece is arranged on the other side of the upper shell, and a fastening part is arranged on the other side of the lower shell; the upper magnetic core is arranged in the upper shell, and the lower magnetic core is arranged in the lower shell; the upper shell is provided with a first groove which is provided with a movable first clamping piece; the lower shell is provided with a second groove which is provided with a second clamping piece; the temperature measuring and electrified sensing probe is arranged in the first or second clamping piece; the coil is arranged on the magnetic core, and the upper shell or the lower shell is provided with a battery jar; the coil and the temperature measuring and electrified sensing probe are electrically connected with the main control board. The sensor fixes the position of a cable through the first clamping piece and the second clamping piece, and the temperature measurement and the electrified sensing probe are embedded in the clamping pieces, so that the current, the temperature and the electrified state of the cable can be monitored simultaneously.

Description

Composite sensor based on current transformer

Technical Field

The utility model relates to a current transformer technical field especially relates to a compound sensor based on current transformer.

Background

There is an urgent need for energy efficiency and cable condition monitoring on the low voltage side of power distribution systems by power consumers. The existing monitoring method mostly adopts various independent instruments such as voltage, current, temperature and the like, so that the existing monitoring method has the disadvantages of more equipment and more complicated installation and measurement process. Current transformer is used for monitoring the electric current of cable, and the inside device that lacks the fixed cable position of current open type current transformer, and the cable can produce the skew in current transformer inside in the measurement process, influences its measuring result precision then.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a compound sensor based on current transformer, it comes the fixed cable position through first holder and second holder to embedded temperature measurement and electrified sensing probe in the holder can monitor the electric current, temperature and the charged state of cable simultaneously.

The purpose of the utility model is realized by adopting the following technical scheme:

a composite current transformer based sensor comprising: the temperature measuring and sensing device comprises an upper shell, a lower shell, an upper magnetic core, a lower magnetic core, a coil, a main control board and a temperature measuring and electrified sensing probe; one side of the upper shell is hinged with one side of the lower shell, a fastening piece is arranged on the other side of the upper shell, a fastening part corresponding to the fastening piece is arranged on the other side of the lower shell, and the fastening piece is matched with the fastening part to tightly close the upper shell and the lower shell together; the upper magnetic core is arranged in the upper shell, the lower magnetic core is arranged in the lower shell, and when the upper shell and the lower shell are closed, the upper magnetic core is abutted to the lower magnetic core; the upper shell is provided with a first groove, the lower shell is provided with a second groove, a movable first clamping piece is arranged in the first groove, and a second clamping piece corresponding to the first clamping piece is arranged in the second groove; the temperature measurement and electrification sensing probe is arranged in the first clamping piece or the second clamping piece, and can be in contact with the cable to measure temperature and sense electrification when the cable is clamped by the first clamping piece and the second clamping piece; the coil is arranged on the upper magnetic core or the lower magnetic core, a battery jar for installing a battery is arranged on the upper shell or the lower shell, and the main control board is arranged in the upper shell or the lower shell; the coil and the temperature measurement and electrified sensing probe are electrically connected with the main control board.

Further, go up the magnetic core or the magnetic core is mobilizable down, and mobilizable magnetic core bottom is equipped with the elastic component in order to avoid go up the magnetic core with the contact surface atress of both is uneven when the closure of magnetic core down.

Further, the elastic piece is a rubber strip or an elastic rubber tube.

Further, the coil is fixed on the upper magnetic core or the lower magnetic core by potting.

Furthermore, the fastening piece is a fastening piece, the fastening part is a protruding part, a through hole corresponding to the protruding part is formed in the fastening piece, and the fastening piece can be buckled on the protruding part.

Further, the fastener is a bolt, the fastening portion is a bolt hole, and the bolt can be screwed into the bolt hole to tightly seal the upper shell and the lower shell together.

Further, the second holder is also movable, the first holder and the second holder both comprise a holding portion and an elastic element, one end of the elastic element is abutted against the bottom of the holding portion, the other end of the elastic element is abutted against the bottom of the corresponding groove, and the groove comprises the first groove and the second groove.

Further, the clamping part is provided with an arc concave surface matched with the surface of the cable to be clamped.

Furthermore, the temperature measurement and electrification sensing probe is movably arranged in the clamping part of the first clamping piece or the second clamping piece through a spring.

Further, the main control board includes: the device comprises a control module, a wireless communication module, a power supply switching module, a current transformer function switching module, a current measuring module, a rectifying module, a voltage threshold detection module and a voltage stabilizing module; the coil is electrically connected with the rectifying module, the rectifying module is electrically connected with the voltage threshold detection module, and the voltage threshold detection module is electrically connected with the voltage stabilizing module; the power supply switching module is electrically connected with the voltage stabilizing module and the battery respectively; the current transformer function switching module is electrically connected with the coil and the current measuring module; the control module is respectively and electrically connected with the temperature measurement and electrified sensing probe, the wireless communication module, the power supply switching module, the current transformer function switching module and the current measurement module.

Compared with the prior art, the beneficial effects of the utility model reside in that:

this compound sensor based on current transformer comes fixed cable position through first holder and second holder, and first holder is mobilizable, but the cable of the different diameters of automatic adaptation to embedded temperature measurement and electrified perception probe in the holder can monitor the electric current, temperature and the electrified state of cable simultaneously.

Drawings

Fig. 1 is an exploded schematic view of a composite sensor based on a current transformer according to the present invention;

fig. 2 is an exploded view of a first clamping member of a composite sensor based on a current transformer, in particular, the first clamping member and a second clamping member have the same structure;

fig. 3 is a first schematic perspective view of a composite sensor based on a current transformer according to the present invention, in which an upper housing and a lower housing are in a separated state;

fig. 4 is a second schematic perspective view of the composite sensor based on the current transformer, in which the upper casing and the lower casing are in a closed state;

fig. 5 is a system structure block diagram of a composite sensor based on a current transformer provided by the present invention;

FIG. 6 is a control logic block diagram of the control module of FIG. 5;

FIG. 7 is a block diagram of circuitry of the wireless communication module of FIG. 5;

FIG. 8 is a control logic block diagram of the power switching module of FIG. 5;

FIG. 9 is a block diagram of a circuit module of the current transformer function switching module and the current measuring module in FIG. 5;

FIG. 10 is a block diagram of a circuit block of the rectifier module of FIG. 5;

FIG. 11 is a block diagram of a circuit block of the voltage threshold detection module of FIG. 5;

FIG. 12 is a block diagram of a circuit of the voltage regulator module of FIG. 5;

FIG. 13 is a block diagram of the circuit of the electrified sensing module of FIG. 5;

fig. 14 is a block diagram of a circuit block of the temperature measurement module of fig. 5.

Reference numerals: 1. an upper housing; 101. a fastener; 102. a first clamping member; 1021. a clamping portion; 1022. an elastic element; 2. a lower housing; 201. a fastening section; 202. a second clamping member; 3. an upper magnetic core; 4. a lower magnetic core; 5. a coil; 6. measuring temperature and sensing probes with electricity; 7. a battery; 8. a battery case; 9. a cover plate; 10. a spring.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

Referring to fig. 1 to 4, a composite sensor based on a current transformer includes: the temperature measuring and sensing device comprises an upper shell 1, a lower shell 2, an upper magnetic core 3, a lower magnetic core 4, a coil 5, a main control board and a temperature measuring and electrified sensing probe 6; one side of the upper shell 1 is hinged with one side of the lower shell 2, the other side of the upper shell 1 is provided with a fastening piece 101, the other side of the lower shell 2 is provided with a fastening part 201 corresponding to the fastening piece 101, and the fastening piece 101 is matched with the fastening part 201 to tightly close the upper shell 1 and the lower shell 2 together; the upper magnetic core 3 is arranged inside the upper shell 1, the lower magnetic core 4 is arranged inside the lower shell 2, and when the upper shell 1 and the lower shell 2 are closed, the upper magnetic core 3 and the lower magnetic core 4 are abutted; the upper shell 1 is provided with a first groove, the lower shell 2 is provided with a second groove, a movable first clamping piece 102 is arranged in the first groove, and a second clamping piece 202 corresponding to the first clamping piece 102 is arranged in the second groove; the temperature measurement and electrification sensing probe 6 is arranged in the first clamping piece 102 or the second clamping piece 202, and when the first clamping piece 102 and the second clamping piece 202 clamp a cable, the temperature measurement and electrification sensing probe 6 can be in contact with the cable to measure temperature and realize electrification sensing; the coil 5 is arranged on the upper magnetic core 3 or the lower magnetic core 4, a battery jar 8 for installing a battery 7 is arranged on the upper shell 1 or the lower shell 2, the battery jar 8 is provided with a detachable cover plate 9, and the main control board is arranged in the upper shell 1 or the lower shell 2; the coil 5 and the temperature measurement and electrified sensing probe 6 are electrically connected with the main control board.

This compound sensor based on current transformer comes fixed cable position through first holder 102 and second holder 202, and first holder 102 is mobilizable, but the cable of different diameters of automatic adaptation to embedded temperature measurement and electrified perception probe 6 in the holder can monitor the electric current of cable, temperature and electrified state simultaneously.

In a preferred embodiment, the upper core 3 or the lower core 4 is movable, and an elastic member is disposed at the bottom of the movable core to prevent the contact surface of the upper core 3 and the lower core 4 from being unevenly stressed when the movable core is closed. Through the structural design, when the upper shell 1 and the lower shell 2 are fastened and fixed together, the contact surfaces of the upper magnetic core 4 and the lower magnetic core 4 can be stressed uniformly through the adjusting action of the elastic piece. Preferably, the elastic member is a rubber strip or an elastic rubber hose. In addition, the elastic part can also be a spring or a V-shaped or open annular elastic sheet and the like, and the position of the upper magnetic core 3 or the lower magnetic core 4 can be adjusted.

In a preferred embodiment, the coil 5 is fixed to the upper core 3 or the lower core 4 by potting. In the present embodiment, the coil 5 is disposed on the lower core 4, and the elastic member is disposed at the bottom of the upper core 3, i.e., the elastic member is located between the upper core 3 and the upper case 1.

In a preferred embodiment, the fastening element 101 is a fastening element, the fastening portion 201 is a protrusion, and the fastening element is provided with a through hole corresponding to the protrusion, and the fastening element can be fastened to the protrusion. As a modified embodiment, the fastening member 101 is a bolt, and the fastening portion 201 is a bolt hole into which the bolt is screwed to fasten and seal the upper case 1 and the lower case 2 together. One sides of the upper casing 1 and the lower casing 2 are closed by means of fastening or bolting, so that the upper casing 1 and the lower casing 2 are conveniently opened and closed. Of course, other securing means that can be easily opened and closed may be used, such as a latch that mates with a slot.

As a preferred embodiment, the second clamping member 202 is also movable, and each of the first clamping member 102 and the second clamping member 202 includes a clamping portion 1021 and an elastic element 1022, wherein one end of the elastic element 1022 abuts against a bottom of the clamping portion 1021, and the other end of the elastic element 1022 abuts against a bottom of a corresponding groove, and the groove includes the first groove and the second groove. In the present embodiment, the elastic element 1022 is a spring.

In a preferred embodiment, the clamping portion 1021 is provided with an arcuate concave surface that engages the surface of the cable to be clamped. Through the arc concave surface for clamping part 1021 and the better cooperation of cable, the cable can be fixed in the arc concave surface, avoids its left and right sides skew.

In a preferred embodiment, the temperature measuring and sensing probe 6 is movably disposed in the holding portion 1021 of the first holding member 102 or the second holding member 202 through a spring 10. The temperature measurement and live sensing probe 6 is arranged to be movable, so that the position of the temperature measurement and live sensing probe can be automatically adjusted according to the thickness of the cable. Of course, the temperature measurement and charge sensing probe 6 may be fixed and flush with the surface of the clamping part 1021, i.e. the temperature measurement and charge sensing probe is also in an arc concave design, and when the cable is fixed between the two clamping parts, the temperature measurement and charge sensing probe 6 can contact the cable.

Specifically, referring to fig. 5 to 14, the main control board includes: the device comprises a control module, a wireless communication module, a power supply switching module, a current transformer function switching module, a current measuring module, a rectifying module, a voltage threshold detection module and a voltage stabilizing module; the coil is electrically connected with the rectifying module, the rectifying module is electrically connected with the voltage threshold detection module, and the voltage threshold detection module is electrically connected with the voltage stabilizing module; the power supply switching module is electrically connected with the voltage stabilizing module and the battery respectively; the current transformer function switching module is electrically connected with the coil and the current measuring module; the control module is respectively and electrically connected with the temperature measurement and electrified sensing probe, the wireless communication module, the power supply switching module, the current transformer function switching module and the current measurement module.

This compound sensor based on current transformer can also realize measuring and getting the electricity through a current transformer through current transformer function switch module, has prolonged the live time of battery power module electric quantity greatly, need not additionally to set up other outside power supply unit, low in manufacturing cost.

The working principle of each module is briefly described as follows:

referring to fig. 6, it is a control logic block diagram of the control module, which is used to control the working logic of the whole sensor, including data collection, processing and forwarding.

Referring to fig. 7, it is a circuit module block diagram of a wireless communication module, where the wireless communication module adopts a wireless radio frequency module, and after the wireless communication module is powered on, the control module configures the wireless communication module and packages and transmits the acquired data to the wireless communication module to be transmitted.

The power supply switching module adopts a power supply management chip with double-path input, a first path of input end of the power supply management chip is electrically connected with a voltage output end of the voltage stabilizing module, a second path of input end of the power supply management chip is electrically connected with a voltage output end of the auxiliary power supply module (namely a battery), an enabling end of the power supply management chip is electrically connected with a voltage output end of the voltage stabilizing module, and an output end of the power supply management chip is electrically connected with the control module. Specifically, as shown IN fig. 8, the power switch is a two-input power management chip, IN1 is connected to the energy obtained by CT processing, IN2 is directly connected to the battery, which current EN enable is valid, EN1 is 0, and IN2 is valid; EN1 is 1, IN1 is active, and the chip outputs VCC, the final operating voltage of the sensor. Of course, other ways may also be adopted to implement power switching, for example, optical couplers or analog switches are adopted.

Referring to fig. 9, it is a block diagram of a circuit module of a current transformer function switching module and a current measuring module, where the current transformer function switching module is a photoelectric coupler, an input end of the photoelectric coupler is electrically connected to the control module, and an output end of the photoelectric coupler is connected in series between the current measuring module and the current transformer. The specific flow is that when the system normally gets electricity and begins to work, the control module supplies power to the optocoupler through IO, the optocoupler is closed, the CT is merged into the measuring circuit, the control module finishes current sampling and calculates to obtain primary current data, and the power supply of the optocoupler is disconnected after the current sampling is finished, so that the CT is switched to the electricity getting circuit again. It should be noted that the switching of the CT power taking and measuring functions is not limited to the optical coupler, and a transistor switching circuit, an electromagnetic relay, and the like may also be used.

Referring to fig. 10, it is a circuit block diagram of a rectifier module, including a resonant capacitor and a voltage-doubling rectifier circuit, including a voltage regulator tube and an energy storage element, in this embodiment, a parallel resonance principle of an inductor is adopted, and the transformer can be simply regarded as an inductor, and through measurement, the inductor level is henry (H), and through calculation, it can be known that the required parallel resonant capacitor only needs a micro-farad (uF) level, which is very easy to achieve. The resonance effect is represented by the increase of the voltage amplitude of the secondary loop and the increase of the branch current, so that smaller secondary voltage can also pass through the rectification voltage doubling circuit, and the power of the branch is also larger, thereby realizing the purpose of reducing the starting current.

Referring to fig. 11, which is a block diagram of a circuit module of the voltage threshold detection module, when the voltage of the energy storage capacitor of the voltage doubling rectifier circuit slowly rises, the voltage of the voltage threshold detection terminal also rises synchronously, and when the voltage threshold detection terminal reaches the upper limit value set by the voltage threshold circuit, the voltage threshold detection chip, i.e., the VEN output of the threshold management chip, is used to enable the voltage stabilization chip. When the voltage of the voltage threshold detection end is lower than the set lower voltage limit value, the VEN does not output, and the voltage stabilizing circuit also stops working. The voltage threshold is set by three resistors.

Referring to fig. 12, which is a circuit diagram of the voltage regulator module, the voltage regulator module is enabled by the upper voltage threshold circuit VEN, and outputs a stable voltage to the control module.

Particularly, the auxiliary power supply module is used as an independent PCB and is connected with the main control board through the pin header.

As a preferred embodiment, the portable electronic device further comprises a charged sensing module, wherein the charged sensing module is electrically connected with the control module and is used for sensing the charged state of the object to be tested in a contact or non-contact manner and displaying the charged state. Preferably, the charged sensing module can directly output the detection result to the control module; of course, the charged state of the object to be tested can be displayed in an LED lamp mode, for example, a green lamp is displayed in a charged mode, and a red lamp is displayed in an uncharged mode. Specifically, referring to fig. 13, the charging sensing module includes: the system comprises a charged sensing probe, a Schmidt inverter and a grounding capacitor; the pin A and the pin B of the Schmitt phase inverter are both electrically connected with the electrified sensing probe, the grounding end of the Schmitt phase inverter is grounded, the power end of the Schmitt phase inverter is electrically connected with the control module to obtain a working power supply, the power end is grounded through a grounded capacitor, and the signal output end of the Schmitt phase inverter is electrically connected with the control module to output a sensing signal to the control module. The working principle of the electrified sensing module is as follows: through connecting electrified perception probe, there is an alternating voltage with same frequency on the perception cable between electrified perception probe and GND this moment, through the effect of Schmidt inverter, outputs a square wave with same frequency to input to control module's IO, judge whether the cable is electrified through the external interrupt mode. In this embodiment, electrified perception probe adopts the metal polar plate, in addition, does not consider and contact the demand with temperature sensor, and the I-shaped inductance also can directly replace the metal polar plate and reach electrified perception function demand.

As a preferred embodiment, the system further comprises a temperature measurement module, and the temperature measurement module is electrically connected with the control module. Referring to fig. 14, the temperature measurement module uses a semiconductor contact temperature sensor to output a voltage to the control module, the voltage and the temperature of the temperature sensor are in a linear relationship, and the control module converts the measured voltage to obtain a temperature value. Particularly, the temperature measuring module and the electrified sensing metal polar plate are integrated on a sensor small plate (namely, a temperature measuring and electrified sensing probe), and the sensor small plate is connected to the main control board through the flexible PCB.

Current transformer products, temperature sensors and so-called non-contact electricity testing devices are not lacked in the market, but the functions and the structures of the current transformer products and the temperature sensors are relatively single in whole market, the use scene limitation is large, the current transformer products and the temperature sensors are not suitable for scenes needing to monitor multiple states simultaneously or a plurality of products need to be installed simultaneously, and therefore installation and maintenance are relatively complex and the cost is high. In this embodiment, this compound sensor has contained three kinds of functions of current measurement, temperature measurement and electrified perception, and the installation and maintenance are convenient for, and the cost is lower.

As a preferred embodiment, the system further comprises a carrier trigger module, and the carrier trigger module is electrically connected with the control module. The carrier trigger module is used for production test and is used for judging whether the function of the wireless module is normal or not.

As a preferred embodiment, the device further comprises an external reference module, wherein the external reference module is electrically connected with the control module; by the module, an external reference voltage can be used, and the accuracy of data measurement is improved. In addition, an internal reference voltage of the control module may also be used, which is conventional in the art and will not be described herein

As a preferred embodiment, the wireless communication system further includes an indicator light module, the indicator light module is electrically connected to the control module, and is mainly used for indicating the current working state of the system, and in this embodiment, the indicator light module flickers when performing wireless transmission. Different states or events can be defined by adjusting the stroboscopic of the indicator lights according to the requirements.

The working process of the composite sensor based on the current transformer is as follows:

the secondary induced current generated by the current transformer charges the energy storage capacitor through the voltage doubling rectifying circuit, the voltage threshold circuit controls and is connected to the voltage stabilizing circuit when a specific voltage value is reached, so that the voltage can be stabilized to the voltage which can normally work, the voltage is stabilized and then passes through the power supply switching circuit, the battery power supply is connected, the power supply can be selected to be provided by the CT (namely the current transformer) or the battery through the judgment of the power supply switching circuit, the CT priority is higher than the battery, namely, the two paths of current are provided with energy at the same time, and the CT power supply is selected preferentially. Then the data is output to a control module, and the control module starts to work according to working logic set by a program: the method comprises the steps of firstly controlling the optocoupler to switch a CT power taking circuit to a measuring circuit, storing measured data in a storage unit, and then switching back to the power taking circuit immediately to ensure the continuous supply of a power supply. And then measuring the temperature, supplying the working voltage of the temperature sensor by the single chip IO, finishing the measurement, storing data and turning off the IO power supply so as to reduce the power consumption. And finally, the single chip microcomputer supplies power to the electrified sensing circuit through IO (input/output), monitors the electrified state in an external interrupt monitoring mode, and also has a storage unit. After all data are collected, the data frames are packed into a data frame with a specific format and are transmitted out through the wireless chip, and thus a complete work cycle is completed. In addition, the period of the charged sensing function is far shorter than the period of measuring other parameters, and wireless transmission data can be triggered immediately when the charged state of the line jumps, so that the charged state of the line can be monitored in time.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A composite sensor based on a current transformer is characterized by comprising: the temperature measuring and sensing device comprises an upper shell, a lower shell, an upper magnetic core, a lower magnetic core, a coil, a main control board and a temperature measuring and electrified sensing probe; one side of the upper shell is hinged with one side of the lower shell, a fastening piece is arranged on the other side of the upper shell, a fastening part corresponding to the fastening piece is arranged on the other side of the lower shell, and the fastening piece is matched with the fastening part to tightly close the upper shell and the lower shell together; the upper magnetic core is arranged in the upper shell, the lower magnetic core is arranged in the lower shell, and when the upper shell and the lower shell are closed, the upper magnetic core is abutted to the lower magnetic core; the upper shell is provided with a first groove, the lower shell is provided with a second groove, a movable first clamping piece is arranged in the first groove, and a second clamping piece corresponding to the first clamping piece is arranged in the second groove; the temperature measurement and electrification sensing probe is arranged in the first clamping piece or the second clamping piece, and can be in contact with the cable to measure temperature and sense electrification when the cable is clamped by the first clamping piece and the second clamping piece; the coil is arranged on the upper magnetic core or the lower magnetic core, a battery jar for installing a battery is arranged on the upper shell or the lower shell, and the main control board is arranged in the upper shell or the lower shell; the coil and the temperature measurement and electrified sensing probe are electrically connected with the main control board.

2. The composite sensor based on current transformer as claimed in claim 1, wherein said upper core or said lower core is movable, and the bottom of the movable core is provided with an elastic member to avoid uneven stress on the contact surface of said upper core and said lower core when they are closed.

3. A composite sensor based on a current transformer as claimed in claim 2, wherein the elastic member is a rubber strip or an elastic rubber tube.

4. The current-transformer-based composite sensor according to claim 1, wherein the coil is fixed on the upper core or the lower core by potting.

5. The composite sensor based on current transformer as claimed in claim 1, wherein said fastening member is a snap-in member, said fastening portion is a protrusion, said snap-in member has a through hole corresponding to said protrusion, said snap-in member can be snapped in said protrusion.

6. The current transformer-based composite sensor of claim 1, wherein the fastening member is a bolt, the fastening portion is a bolt hole, and the bolt is screwed into the bolt hole to tightly seal the upper case and the lower case together.

7. The composite sensor based on current transformer as claimed in claim 1, wherein said second holding member is also movable, said first holding member and said second holding member each comprise a holding portion and an elastic member, one end of said elastic member abuts against the bottom of said holding portion, the other end of said elastic member abuts against the bottom of the corresponding groove, and said groove comprises said first groove and said second groove.

8. A composite current transformer based sensor according to claim 7, wherein said clamping portion is provided with an arcuate concave surface for engaging with a surface of a cable to be clamped.

9. The composite sensor based on current transformer as claimed in claim 8, wherein the temperature measuring and sensing probe is movably disposed in the holding portion of the first holding member or the second holding member by a spring.

10. A composite sensor based on a current transformer according to any one of claims 1 to 9, characterized in that the main control board comprises: the device comprises a control module, a wireless communication module, a power supply switching module, a current transformer function switching module, a current measuring module, a rectifying module, a voltage threshold detection module and a voltage stabilizing module; the coil is electrically connected with the rectifying module, the rectifying module is electrically connected with the voltage threshold detection module, and the voltage threshold detection module is electrically connected with the voltage stabilizing module; the power supply switching module is electrically connected with the voltage stabilizing module and the battery respectively; the current transformer function switching module is electrically connected with the coil and the current measuring module; the control module is respectively and electrically connected with the temperature measurement and electrified sensing probe, the wireless communication module, the power supply switching module, the current transformer function switching module and the current measurement module.