CN110426636A - Intelligent electric machine is electrically connected piece integrated form internet of things sensors - Google Patents
Intelligent electric machine is electrically connected piece integrated form internet of things sensors Download PDFInfo
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- CN110426636A CN110426636A CN201910852350.3A CN201910852350A CN110426636A CN 110426636 A CN110426636 A CN 110426636A CN 201910852350 A CN201910852350 A CN 201910852350A CN 110426636 A CN110426636 A CN 110426636A
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- 239000004020 conductor Substances 0.000 claims abstract description 22
- 230000004224 protection Effects 0.000 claims description 13
- 239000011810 insulating material Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 13
- 230000008859 change Effects 0.000 abstract description 4
- 206010037660 Pyrexia Diseases 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
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- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000010125 resin casting Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
Abstract
The invention proposes a kind of intelligent electric machines to be electrically connected piece integrated form internet of things sensors, belongs to intelligent motor monitoring technical field.Including electrical connection piece, current transformer, current transformer rectangular opening, conductor frame, screw, voltage transformer, temperature sensor etc..Utilize electrical connection piece prepackage current transformer, voltage transformer and temperature sensor, connection box for motor inner space is made full use of, do not change the structure of motor, any other influence caused on motor, when carrying out motor monitoring and detection, plug and play, even without power-off, it is very convenient.Using screw and conductor frame in the position for guaranteeing that electrical connection piece is conveniently adjusted, locked while taking electric reliability;Temperature sensor is capable of the temperature change of real-time monitoring connection sheet two sides binding post, effectively prevent the failures such as fever even burning caused by binding post bolt looseness or poor contact.Whole device structure is simple, at low cost, small in size, is widely portable to various types motor.
Description
Technical field
The present invention relates to a kind of intelligent electric machine sensor, simple, the easy for installation intelligent electric machine of especially a kind of structure
It is electrically connected piece integrated form internet of things sensors, belongs to intelligent motor monitoring technical field.
Background technique
Motor is widely used in industrial every field, with the development of information technology and the proposition of intelligence manufacture,
The main trend that the intelligence of motor, i.e. intelligent electric machine system are future development is that all trades and professions realize the important of intelligence manufacture
Basis.The stable operation of motor has very great meaning for normally producing, living, and motor in the process of running may
There is various types failure, such as over-voltage, overcurrent, overload, phase shortage etc., if handling in time without monitoring, frequently can lead to motor
Motor service life is lowered in the irreversible damage of critical component, system run all right is destroyed, thus the production to enterprise
Security risk is brought, therefore very necessary to the on-line monitoring of motor operation electrical parameter.
Present inventor is in Chinese patent " intelligent electric machine system " (application number: proposed in 201710259096.7)
Intelligent electric machine system, including intelligent operation fault diagnosis, the intelligent control of motor, the efficiency of motor control etc., all rely on
The accumulation of the online real time collecting and operation big data of motor operating parameter;In other words in intelligent electric machine systematic realizing program,
Sensor is crucial one of core technology.
Current middle and small motor operating status on-line monitoring mainstream technology is first is that using isolated sensor, provisional peace
The mode of dress, two are different system installs independent sensor respectively.Using split type sensor, the mould of provisional installation
Voltage, current transformer etc. are separately mounted on motor inlet wire, cooperation measures, and is taken up space by formula after shutting down power-off
Greatly, higher cost, difficult to load and unload, safety is poor, need to shut down power failure influence production;The cable and wiring being related to simultaneously are many and diverse, letter
Number transmission interference is big, and be easy to cause wiring error, brings many inconvenience to operator during the installation process.In addition, not
Same system installs independent sensor respectively, and higher, poor compatibility that there are system costs, operational monitoring data cannot be total in time
The problem of enjoying greatly constrains the implementation and development of motor field intelligence manufacture.
In the integrated aspect of motor measurement sensor, Chinese patent " the neutral point terminal box of high-voltage explosion-proof motor " (Shen
Please number: 201120309600.8) propose that a kind of " current transformer and connecting terminal of motor are directly connected in box body, are not required to
Reconnect current transformer and connecting terminal, direct output current transformer secondary singal." it is to install current transformer in advance
Do not have versatility due to ordinary motor junction box narrow space in the neutral point position of star-like connection;In addition, only
It is the measurement for having carried out electric current.
Chinese patent " a kind of terminal box for monitoring motor operation data " (application number: 201120133292.8) is mentioned in electricity
In machine terminal box, Current Transformer passes through the sampling that motor binding post carries out motor current signal, but without open specific
Structure and installation method, and under regular situation, the binding post inside motor is shorter, and is unilateral wiring, only plays branch
Support fixed function.If pairs of posts and current transformer do not carry out creative rational improvement, can not be directly realized by,
And other designs are also difficult to meet the requirement of intelligent electric.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of intelligent electric machine electrical connection piece integrated form Internet of Things biography
Sensor, with integrated, the miniaturization, modularization of voltage, electric current needed for realizing intelligent electric machine system and temperature sensor, and
Compatibility, convenience, flexibility, reliability, safety etc..It is an object of the invention to be collected by pre-installing in motor connection sheet
Accepted way of doing sth sensor does not change the structure of motor, does not cause any other influence to motor, when carrying out motor monitoring and detection,
Plug and play, even without power-off, realize the intelligent on-line monitoring of motor;And there is of simple structure and low cost, volume
Many advantages, such as small, easy to use, is widely portable to various types motor.
The technical solution adopted by the present invention to solve the technical problems is:
The intelligent electric machine electrical connection piece integrated form internet of things sensors includes electrical connection piece (1), current transformer
(2), current transformer rectangular opening (3), current transformer output end (4), conductor frame (5), screw (6), voltage transformer
(7), voltage transformer first input end (8), the second input terminal of voltage transformer (9), voltage transformer output end (10), current limliting
Resistance (11).
Electrical connection piece (1) is passed through from the intermediate current transformer rectangular opening (3) of current transformer (2), current transformer
Output end (4) draws tested current signal.Dual wire terminals or Shielded Twisted Pair side can be used in current transformer output end (4)
Formula has many advantages, such as that strong antijamming capability, wiring are easy, are cheap, can effectively reduce electromagnetic interference, improves sampling and survey
Accuracy of measurement.The current transformer (2) is integrated to be installed in electrical connection piece (1), when measurement do not need to motor body into
Row disassembly, that is, connect and use.
It is equipped on conductor frame (5) screw (6), screw (6) is rotatable to be held out against in electrical connection piece (1), and electric current is mutual
Sensor (2), conductor frame (5) and voltage transformer (7) are fixed together.Conductor frame (5) passes through screw (6) and electrical connection
Piece (1) realizes electrical connection, obtains voltage signal for voltage transformer (7), it is fixed and conductive that conductor frame (5) can play support
Effect, meanwhile, the position of adjustment, locking electrical connection piece (1) is also convenient for using screw (6) mode, and to the sensor
Entirety plays fixed function.
Voltage transformer first input end (8) is connected with the middle line of power supply, the second input terminal of voltage transformer (9) warp
Current-limiting resistance (11) is connected with conductor frame (5), and voltage transformer output end (10) draws measured voltage signal.Due to from electricity
The electric signal that machine point of incoming cables obtains is forceful electric power signal, it is necessary to be converted into the letter of the light current in monitoring device allowed band by processing
Number, forceful electric power voltage signal is become light current current signal by current-limiting resistance (11), passes through voltage transformer first input end (8) and electricity
Pressure the second input terminal of mutual inductor (9) is sent into the light current measured signal that voltage transformer (7) are transformed into standard, defeated through voltage transformer
Outlet (10) is drawn.Dual wire terminals or Shielded Twisted Pair mode can be used in voltage transformer output end (10).
It can also be another with power supply according to the environment at scene and specific requirement, voltage transformer first input end (8)
Phase (line voltage) connection, or ground connection (phase voltage), and the voltage that can be drawn with conductor frame (5) is combined into external equipment and provides
Power supply.In addition, if such as installing electrical machine energy-saving device and intellective protector simultaneously when motor needs to install multiple and different control devices
Situations such as, the present apparatus can be shared as electrical energy data acquiring equipment, to save respective electrical energy data acquiring equipment, and do not had to
It separately mounts and dismounts, simplifies structure, reduce costs, realize to connect and use.
Connection box for motor inner space is made full use of, mating can be pre-installed in motor manufacturing factory, while to the electricity in fortune
Machine can not also do any structural modification, that is, can be carried out installation.Compared to it is traditional be temporarily installed at it is split type on motor inlet wire
Sensor has and installs when repeatedly measurement without repeating, more convenient to use, flexible and reasonable advantage.
Further, intelligent electric machine electrical connection piece integrated form internet of things sensors includes current-limiting resistance box (12)
And protection cap (13), current-limiting resistance (11) are installed in current-limiting resistance box (12), are encapsulated using transparent protection cap (13), current limliting
Resistance box (12) is series between conductor frame (5) and voltage transformer first input end (8).Current-limiting resistance box (12) is buckle
Formula design, current-limiting resistance (11) can be put into or take out at any time, and replacement is convenient, or the resistance of current-limiting resistance is adjusted according to voltage class
Value.Protection cap (13) shell is designed as transparent configuration, while effective waterproof and dustproof, is also convenient for directly reading current-limiting resistance
(11) specific resistance value, facilitates operations staff to operate.Certainly, if when using Hall type voltage transformer, it may not be necessary to use
Current-limiting resistance (11).
Further, intelligent electric machine electrical connection piece integrated form internet of things sensors includes temperature sensor (14)
With temperature sensor output end (15), the probe of temperature sensor (14) is close to electrical connection piece (1) installation.Temperature sensor
(14) it can also be used contactless such as infrared sensor using contact such as thermal resistance class sensor.Due to electricity
Machine binding post is used to connect motor power inlet wire and winding inlet wire, and inlet wire is generally crimped on to the side on binding post using nut
Formula.Motor is continuous, in long-term operation process, often will appear that running current is excessive or the extremely caused bolt pine of motor oscillating
The problems such as dynamic and connecting part poor contact, causes seriously to generate heat at binding post, melts the phenomenon that even catching fire Shi Youfa
It is raw.There is no the Preventive and protective measure of this respect in existing technology, the protective device of motor can not also be protected.Temperature
The temperature of sensor (14) measurement electrical connection piece (1), that is to say the temperature for measuring motor binding post, can be to above-mentioned electricity
Machine binding post fever class failure carries out effective early warning and alarm, there is no carry out temperature prison to motor binding post in the prior art
The technology of survey occurs.
Further, the current transformer (2), conductor frame (5), voltage transformer (7) use insulating materials
(16) casting is encapsulated as an entirety.Insulating resin casting generally can be used in insulating materials (16), by current transformer (2), leads
Body frame (5), voltage transformer (7), current-limiting resistance box (12), temperature sensor (14) are encapsulated as an entirety, realize integrated
The electrical isolation of formula sensor and external environment can effectively reduce whole volume, simplify integrated type sensor structure, improve collection
At degree is changed, cost is reduced.
Compared with prior art, the present invention has the advantage that
1) integrated form internet of things sensors is pre-installed on motor, is made full use of connection box for motor inner space, is not changed motor
Structure does not cause any other influence to motor, when carrying out motor monitoring and detection, plug and play, even without power-off, and ten
It is convenient to divide;And whole device is of simple structure and low cost, small in size, is widely portable to various types motor;Needed for realizing
The integrated of sensor, miniaturization, modularization, and compatibility, convenience, flexibility, reliability, safety etc.;It is especially heavy
It wants, realizes the basic platform of intelligent electric machine system.
2) various sensors are encapsulated in inside connection box for motor, an entirety is encapsulated as using insulating materials casting, it is real
The electrical isolation of existing integrated type sensor and external environment, while the protections such as dust-proof, waterproof also are played to these sensors and are made
With.
3) temperature sensor is set in motor connection sheet, the temperature for capableing of real-time monitoring connection sheet two sides binding post becomes
Change, and carry out early warning or alarm when abnormal, fever caused by binding post bolt looseness or poor contact is effectively prevent even to fire
The failures such as burning.
4) it realizes and is electrically connected using screw and conductor frame and electrical connection piece, replace conventional wires way to take power, have
Effect improves field connection efficiency, and raising takes electric reliability.The position of electrical connection piece is conveniently adjusted, locked simultaneously, and to institute
It states sensor and integrally plays fixed function.
5) current-limiting resistance box is designed using buckle-type, and operator can adjust the resistance value of current-limiting resistance according to voltage class,
Current-limiting resistance can be put into or take out at any time, and installation and removal are convenient;And protection cap is transparent configuration, operator can conveniently check
Current-limiting resistance value.
Detailed description of the invention
Fig. 1: the overall structure figure of integrated form internet of things sensors.
In figure: 1- be electrically connected piece, 2- current transformer, 3- current transformer rectangular opening, 4- current transformer output end,
5- conductor frame, 6- screw, 7- voltage transformer, 8- voltage transformer first input end, the second input terminal of 9- voltage transformer,
10- voltage transformer output end, 11- current-limiting resistance, 12- current-limiting resistance box, 13- protection cap, 14- temperature sensor, 15- temperature
Sensor output, 16- insulating materials.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings:
It is as shown in Figure 1 the overall structure figure of integrated form internet of things sensors.In Fig. 1, the intelligent electric machine is electrically connected piece
Integrated form internet of things sensors is mutual including electrical connection piece (1), current transformer (2), current transformer rectangular opening (3), electric current
Sensor output end (4), conductor frame (5), screw (6), voltage transformer (7), voltage transformer first input end (8), voltage
The second input terminal of mutual inductor (9), voltage transformer output end (10), current-limiting resistance (11), current-limiting resistance box (12), protection cap
(13), temperature sensor (14), temperature sensor output end (15), insulating materials (16).
In Fig. 1, the current transformer (2), conductor frame (5), voltage transformer (7), current-limiting resistance box (12), temperature
Degree sensor (14) is encapsulated as an entirety by insulating materials (16).Piece (1) is electrically connected from intermediate current transformer square
Shape hole (3) passes through, and screw (6) rotation on conductor frame (5) is held out against in electrical connection piece (1), realizes electrical connection, together
When be conveniently adjusted, lock the whole position with electrical connection piece (1) of the sensor, and fixation is integrally played to the sensor
Effect.The probe of temperature sensor (14) is close to electrical connection piece (1) installation, and the temperature of measurement electrical connection piece (1) that is to say
The temperature of two sides motor binding post is measured, the class failure that can generate heat motor binding post carries out effective early warning and alarm.
In Fig. 1, electrical connection piece (1) is fixed on the motor binding post of two sides, and binding post is usually to be cast in junction block
On.Motor power inlet wire is accessed from side motor binding post, according to the difference of the motor mode of connection on the motor binding post of two sides,
It may be all connected to machine winding inlet wire, electrical connection piece (1) is the conductive channel of machine winding current, therefore when motor operation,
Current transformer (2) can directly acquire the current signal of winding, voltage transformer (7) can directly acquire the voltage signal of winding.
Connection box for motor inner space is made full use of, mating can be pre-installed in motor manufacturing factory, while can not also to the motor in fortune
Any structural modification is done, that is, can be carried out installation.Compared to traditional split type sensor being temporarily installed on motor inlet wire, tool
Have and is installed when multiple measurement without repeating, more convenient to use, flexible and reasonable advantage.
In Fig. 1, motor power inlet wire and winding inlet wire are in such a way that nut is crimped on binding post.Motor it is continuous,
In long-term operation process, it often will appear that running current is excessive or the extremely caused bolt looseness of motor oscillating and connecting part
The problems such as poor contact, causes at binding post seriously to generate heat, melts the phenomenon that even catching fire and happen occasionally.Temperature sensor
(14) measure temperature over-range when, can be issued warning signal in time by external intelligent measuring and control device, or to motor directly into
Row trip protection.
In Fig. 1, current transformer output end (4), voltage transformer output end (10), temperature sensor output end (15) etc.
Using Shielded Twisted Pair mode, has many advantages, such as that strong antijamming capability, wiring are easy, are cheap, electromagnetism can be effectively reduced
Interference improves sampling and measurement accuracy.It can be made into external terminal or plug, extraction connection box for motor is spare, when needing to measure not
Sensor must be dismantled or installed to motor body, and operator directly can connect and use.
In Fig. 1, since the voltage signal obtained at electrical connection piece (1) is forceful electric power signal, series limiting resistor box
(12) forceful electric power signal can be made to be converted into the weak electric signal in monitoring device allowed band.Current-limiting resistance box (12) sets for buckle-type
Meter, current-limiting resistance can be put into or take out at any time, and replacement is convenient, or the resistance value of current-limiting resistance is adjusted according to voltage class;To guarantee
It is reliably connected, the modes such as pressure line terminal can be used.Protection cap (13) shell is designed as transparent configuration, can directly read specific resistance
Value, facilitates operations staff to operate.Rubber plug structure can also be used in protection cap, further functions as the effect of waterproof and dustproof.
The foregoing is merely preferable embodiments of the invention, are not intended to limit the invention, all in spirit of the invention
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. intelligent electric machine is electrically connected piece integrated form internet of things sensors, it is characterised in that: including being electrically connected piece (1), electric current
Mutual inductor (2), current transformer rectangular opening (3), current transformer output end (4), conductor frame (5), screw (6), voltage are mutual
Sensor (7), voltage transformer first input end (8), the second input terminal of voltage transformer (9), voltage transformer output end (10),
Current-limiting resistance (11);
Electrical connection piece (1) is passed through from the intermediate current transformer rectangular opening (3) of current transformer (2), current transformer output
End (4) is drawn by tested current signal;
It is equipped on conductor frame (5) screw (6), screw (6) is rotatable to be held out against in electrical connection piece (1), current transformer
(2), conductor frame (5) and voltage transformer (7) are fixed together;
Voltage transformer first input end (8) is connected with the middle line of power supply, and the second input terminal of voltage transformer (9) is through current limliting
Resistance (11) is connected with conductor frame (5), and voltage transformer output end (10) draws measured voltage signal.
2. intelligent electric machine according to claim 1 is electrically connected piece integrated form internet of things sensors, it is characterised in that: including
Current-limiting resistance box (12) and protection cap (13), current-limiting resistance (11) is installed in current-limiting resistance box (12), using transparent protection
(13) encapsulation is covered, current-limiting resistance box (12) is series between conductor frame (5) and voltage transformer first input end (8).
3. intelligent electric machine according to claim 1 is electrically connected piece integrated form internet of things sensors, it is characterised in that: including
Temperature sensor (14) and temperature sensor output end (15), the probe of temperature sensor (14) are close to electrical connection piece (1) peace
Dress.
4. intelligent electric machine according to claim 1 is electrically connected piece integrated form internet of things sensors, it is characterised in that: described
Current transformer (2), conductor frame (5), voltage transformer (7) using insulating materials (16) casting be encapsulated as an entirety.
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