CN208140867U - A kind of cable insulation monitoring device - Google Patents
A kind of cable insulation monitoring device Download PDFInfo
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- CN208140867U CN208140867U CN201820599866.2U CN201820599866U CN208140867U CN 208140867 U CN208140867 U CN 208140867U CN 201820599866 U CN201820599866 U CN 201820599866U CN 208140867 U CN208140867 U CN 208140867U
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Abstract
The utility model discloses a kind of cable insulation monitoring devices, including leakage current sample circuit, voltage sampling circuit, current sampling circuit, wireless temperature acquisition machine, single-chip microcontroller and liquid crystal display, the leakage current sample circuit, the voltage sampling circuit, the current sampling circuit, the wireless temperature acquisition machine and the liquid crystal display with the monolithic mechatronics.Beneficial effect：Can formation curve figure facilitate staff to can be carried out assessment to cable insulation, when cable performance value occur beyond setting safety limit when, device is alarmed, prompt staff cable is safeguarded.Also on influence cable service life factor in system, such as cable temperature, system power, harmonic current are detected, and show that exception item reminds staff to handle exception item by man-machine interface when occurring abnormal, guarantee cable energy longer time trouble free service, slow down cable aging, reduces cable and use security risk.
Description
Technical field
The utility model relates to power transmission and distribution insulating performance of cable monitoring device technical field more particularly to a kind of cable insulations
Monitoring device.
Background technique
The insulating layer of high-tension cable has the effects that shield interference, lightning protection, protects cable core, is moisture-proof, to electricity whether intact
The service life of cable has very big influence.If cable insulation is impaired, protective metal shell circulation can be caused to increase, not only influence electricity
Cable current-carrying capacity, and will lead to protective metal shell calorific value sharp increase, cable insulation is further damaged, accelerates its aging speed, very
Electric cable explosion accident can extremely occur.There is presently no the devices that specially can be carried out on-line monitoring to cable insulation, can only pass through
Periodic detection, periodic detection there is cable it is impaired cannot find in time, testing cost is high the defects of.
Utility model content
Purpose of the utility model is to solve disadvantages present in background technique, and a kind of cable insulation prison proposed
Survey device.
Technical solution used by the utility model is：A kind of cable insulation monitoring device, including leakage current sample circuit,
Voltage sampling circuit, current sampling circuit, wireless temperature acquisition machine, single-chip microcontroller and liquid crystal display, the leakage current sampling electricity
Road, the voltage sampling circuit, the current sampling circuit, the wireless temperature acquisition machine and the liquid crystal display are and institute
State monolithic mechatronics, wherein the leakage current Acquisition Circuit is connected by high-precision hall sensor with cable shield,
The leakage current sample circuit includes that the voltage of Order RC filter and high impedance amplifying circuit raises circuit, and the high-precision is suddenly
The voltage that the signal output end of your sensor passes sequentially through Order RC filter and high impedance amplifying circuit raise circuit with it is described
The AD thief hatch of single-chip microcontroller is electrically connected.
Further, the Order RC filter circuit includes current transformer, and the current transformer is simultaneously connected to resistance
One end of R14, the resistance R14 are connect with one end of capacitor C5, the other end of the resistance R14 by resistance R15 with it is described
The other end of capacitor C5 is connected, and the capacitor C5 is simultaneously connected to capacitor C6, passes through electricity between the capacitor C5 and the capacitor C6
Hinder R16 connection.
Further, it includes the first amplifier U1, the second amplifier that the voltage of the high impedance amplifying circuit, which raises circuit,
U2, third amplifier U3, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12 and resistance R13, wherein the resistance
One end of R8 connects the reverse input end of the first amplifier U1, and the other end connects the output of the first amplifier U1
End, the output end of the first amplifier U1 are connected by the R10 with the reverse input end of the third amplifier U3, and
The reverse input end of the third amplifier U3 is connected by the resistance R11 with the output end of the third amplifier U3,
The reverse input end of the second amplifier U2 by the resistance R9 with the output end of the second amplifier U2 by being connected
It connecing, the output end of the second amplifier U2 is connected by the R12 with the positive input of the third amplifier U3, and
The R12 and R13 is connected in series.
Further, the output end of the third amplifier U3 is followed by reference voltage 3.0V by diode D5, and described
The output end of third amplifier U3 is grounded by diode D6.
Further, the voltage sampling circuit includes voltage transformer, the input terminal and resistance of the voltage transformer
R1 electrical connection, and the output end of the voltage transformer is connected by resistance R2 with voltage-stabiliser tube TVS, the voltage transformer
Another output end is connected with resistance R3, and one end of the resistance R3 is grounded by capacitor C1, the other end connection of the resistance R3
There is resistance R4, one end of the resistance R4 is grounded by capacitor C2, and the other end of the resistance R4 and voltage follower are just
Be connected to input terminal, the output end of the voltage follower is followed by reference voltage 3.0V by diode D1, the voltage with
With the output end of device by being grounded after diode D2.
Compared with prior art, the utility model has the beneficial effects that：
(1), the utility model leakage current sampling uses high-precision hall formula sensor, improves leakage current sampling precision, and
The signal interference in transmission process can be reduced；
(2), the utility model signal processing circuit ensures to sample accurate, high sensitivity；
(3), the utility model strong antijamming capability, system power supply part use integrated AC-DC module power supply, system
It is more stable；
(4), the utility model uses wireless signal acquiring cable temperature, adaptable, and it is expansible to can detect multi-point temperature
Property is strong；
(5), the utility model has 485 communication functions, has installed signal transmission interface additional, it can be achieved that and synthetical automatic control
Equipment networking considerably increases the degree of automation；
(6), the utility model carries out data record by the set time, and formation curve figure facilitates staff exhausted to cable
Edge performance is assessed.When cable performance value occurs beyond setting safety limit, device is alarmed, and staff couple is prompted
Cable is safeguarded.Also in system influence cable service life factor, such as cable temperature, system power, harmonic current into
Row detection, and show that exception item reminds staff to handle exception item by man-machine interface when occurring abnormal, guarantee
Cable energy longer time trouble free service slows down cable aging, reduces cable and uses security risk.
Detailed description of the invention
Fig. 1 is the leakage current sample circuit in a kind of cable insulation monitoring device；
Fig. 2 is the voltage sampling circuit in a kind of cable insulation monitoring device.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
In the description of the present invention, it should be understood that term " on ", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as "top", "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
Referring to Fig.1-2, a kind of cable insulation monitoring device, including leakage current sample circuit, voltage sampling circuit, electric current are adopted
Sample circuit, wireless temperature acquisition machine, single-chip microcontroller and liquid crystal display, the leakage current sample circuit, the voltage sampling circuit,
The current sampling circuit, the wireless temperature acquisition machine and the liquid crystal display with the monolithic mechatronics, wherein
The leakage current Acquisition Circuit is connected by high-precision hall sensor with cable shield, the leakage current sample circuit packet
The voltage for including Order RC filter and high impedance amplifying circuit raises circuit, the signal output end of the high-precision hall sensor
The voltage for passing sequentially through Order RC filter and high impedance amplifying circuit raises the AD thief hatch of circuit and the single-chip microcontroller and is electrically connected
It connects.
In one embodiment, the Order RC filter circuit includes current transformer, and the current transformer is simultaneously connected to
Resistance R14, one end of the resistance R14 are connect with one end of capacitor C5, the other end of the resistance R14 by resistance R15 with
The other end of the capacitor C5 is connected, and the capacitor C5 is simultaneously connected to capacitor C6, leads between the capacitor C5 and the capacitor C6
Cross resistance R16 connection.
In one embodiment, it includes the first amplifier U1, second that the voltage of the high impedance amplifying circuit, which raises circuit,
Amplifier U2, third amplifier U3, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12 and resistance R13, wherein institute
The one end for stating resistance R8 connects the reverse input end of the first amplifier U1, and the other end connects the first amplifier U1's
The output end of output end, the first amplifier U1 is connected by the R10 with the reverse input end of the third amplifier U3
It connects, and the reverse input end of the third amplifier U3 passes through the output end phase of the resistance R11 and the third amplifier U3
The reverse input end of connection, the second amplifier U2 passes through the output end by the resistance R9 and the second amplifier U2
It is connected, the output end of the second amplifier U2 is connected by the R12 with the positive input of the third amplifier U3
It connects, and the R12 and R13 is connected in series.
In one embodiment, the output end of the third amplifier U3 is followed by reference voltage 3.0V by diode D5,
And the output end of the third amplifier U3 is grounded by diode D6.
In one embodiment, the voltage sampling circuit includes voltage transformer, the input terminal of the voltage transformer
It is electrically connected with resistance R1, and the output end of the voltage transformer is connected by resistance R2 with voltage-stabiliser tube TVS, the voltage is mutual
Another output end of sensor is connected with resistance R3, and one end of the resistance R3 is grounded by capacitor C1, and the resistance R3's is another
End is connected with resistance R4, and one end of the resistance R4 is grounded by capacitor C2, and the other end and voltage follow of the resistance R4
The positive input of device is connected, and the output end of the voltage follower is followed by reference voltage 3.0V by diode D1, described
The output end of voltage follower is grounded after passing through diode D2.
The present invention will be further described with reference to the accompanying drawing.
Leakage current sampling section：Referring to Fig. 1, leakage current sensor input signal is through R14 pressure stabilizing, and the voltage on R14 is through two
Rank RC filter circuit is filtered, then through signal high-impedance differential amplifying circuit voltage by integral raising, raising voltage magnitude is
Vref, the output of signal high-impedance differential amplifying circuit are input to Chip Microcomputer A/D thief hatch after diode clamp protects circuit, lead to
It crosses mcu programming and calculates leakage current actual value.The principle and method of calculating are as follows：The current value of leakage current is Ilc, electric leakage
Flow sensor no-load voltage ratio is Tr1:1 (unit mA:V), the alternating voltage of input is raised to zero volt or more by Vref, ensure that in Ilc
Single-chip microcontroller still can be normally carried out AD conversion work when for negative current magnitude.The voltage value for being input to Chip Microcomputer A/D thief hatch isThus the relationship for deriving the current value of leakage current and the voltage of Chip Microcomputer A/D mouth is Ilc=(VAD-
Vref)*Tr1。
Voltage sample part：Referring to fig. 2, voltage transformer input signal is converted into current signal through R1, then through current mode
Voltage transformer, mutual inductor output signal change voltage signal into through R2, while in mutual inductor output end voltage by integral raising, lift
High voltage amplitude is Vref, and the voltage signal after raising is through Order RC filter circuit and voltage follower, most afterwards through diode clamp
After position protection circuit, it is input to Chip Microcomputer A/D thief hatch, voltage actual value is calculated by mcu programming.The principle of calculating and
Method is as follows：System voltage value is Ua, and voltage transformer no-load voltage ratio is Tr2:1, current mode voltage transformer no-load voltage ratio is 1:1, Vref
The alternating voltage of input is raised to zero volt or more, ensure that single-chip microcontroller still can be normally carried out AD when Ua is negative value
Conversion work.The voltage value for being input to Chip Microcomputer A/D thief hatch isThus derivation system voltage with
The relationship of the voltage of Chip Microcomputer A/D mouth is
Wireless temperature measurement part：Wireless temperature measure module uses imported with original packaging NRF24L01 chip, can receive 12 road temperature signals.
Using 2.4G open frequency range (ISM), battery power supply or induction take electricity.
Liquid-crystal display section：Display portion selects LED liquid crystal display, has in display：Leakage current, insulation resistance, Jie
Matter loss, cable temperature, system voltage, system power and current harmonics value etc., and record display leakage current, insulation resistance and Jie
History graphs, the historical datas such as alarm logging are lost in matter.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (5)
1. a kind of cable insulation monitoring device, including it is leakage current sample circuit, voltage sampling circuit, current sampling circuit, wireless
Temperature sampler, single-chip microcontroller and liquid crystal display, which is characterized in that the leakage current sample circuit, the voltage sampling circuit,
The current sampling circuit, the wireless temperature acquisition machine and the liquid crystal display with the monolithic mechatronics, wherein
The leakage current Acquisition Circuit is connected by high-precision hall sensor with cable shield, the leakage current sample circuit packet
The voltage for including Order RC filter and high impedance amplifying circuit raises circuit, the signal output end of the high-precision hall sensor
The voltage for passing sequentially through Order RC filter and high impedance amplifying circuit raises the AD thief hatch of circuit and the single-chip microcontroller and is electrically connected
It connects.
2. a kind of cable insulation monitoring device according to claim 1, which is characterized in that the Order RC filter circuit packet
Current transformer is included, the current transformer is simultaneously connected to resistance R14, and one end of the resistance R14 is connect with one end of capacitor C5,
The other end of the resistance R14 is connected by resistance R15 with the other end of the capacitor C5, and the capacitor C5 is simultaneously connected to capacitor
C6 is connected between the capacitor C5 and the capacitor C6 by resistance R16.
3. a kind of cable insulation monitoring device according to claim 1, which is characterized in that the high impedance amplifying circuit
Voltage raise circuit include the first amplifier U1, the second amplifier U2, third amplifier U3, resistance R8, resistance R9, resistance R10,
Resistance R11, resistance R12 and resistance R13, wherein one end of the resistance R8 connects the reversed input of the first amplifier U1
End, the other end connect the output end of the first amplifier U1, the output end of the first amplifier U1 by the R10 with
The reverse input end of the third amplifier U3 is connected, and the reverse input end of the third amplifier U3 passes through the resistance
R11 is connected with the output end of the third amplifier U3, and the reverse input end of the second amplifier U2 passes through by described
Resistance R9 is connected with the output end of the second amplifier U2, the output end of the second amplifier U2 by the R12 with
The positive input of the third amplifier U3 is connected, and the R12 and R13 is connected in series.
4. a kind of cable insulation monitoring device according to claim 3, which is characterized in that the third amplifier U3's is defeated
Outlet is followed by reference voltage 3.0V by diode D5, and the output end of the third amplifier U3 is grounded by diode D6.
5. a kind of cable insulation monitoring device according to claim 1, which is characterized in that the voltage sampling circuit includes
The input terminal of voltage transformer, the voltage transformer is electrically connected with resistance R1, and the output end of the voltage transformer passes through
Resistance R2 is connected with voltage-stabiliser tube TVS, and another output end of the voltage transformer is connected with resistance R3, and the one of the resistance R3
End is grounded by capacitor C1, and the other end of the resistance R3 is connected with resistance R4, and one end of the resistance R4 is connect by capacitor C2
Ground, and the other end of the resistance R4 is connected with the positive input of voltage follower, the output end of the voltage follower
It is followed by reference voltage 3.0V by diode D1, the output end of the voltage follower after diode D2 by being grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820599866.2U CN208140867U (en) | 2018-04-25 | 2018-04-25 | A kind of cable insulation monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820599866.2U CN208140867U (en) | 2018-04-25 | 2018-04-25 | A kind of cable insulation monitoring device |
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| Publication Number | Publication Date |
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| CN208140867U true CN208140867U (en) | 2018-11-23 |
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| CN201820599866.2U Active CN208140867U (en) | 2018-04-25 | 2018-04-25 | A kind of cable insulation monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521340A (en) * | 2018-12-10 | 2019-03-26 | 珠海许继电气有限公司 | Distribution line insulation detection device and detection method |
-
2018
- 2018-04-25 CN CN201820599866.2U patent/CN208140867U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521340A (en) * | 2018-12-10 | 2019-03-26 | 珠海许继电气有限公司 | Distribution line insulation detection device and detection method |
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