CN208255304U - A kind of electric transmission line lightning arrester dash current detection sensor - Google Patents
A kind of electric transmission line lightning arrester dash current detection sensor Download PDFInfo
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- CN208255304U CN208255304U CN201820757120.XU CN201820757120U CN208255304U CN 208255304 U CN208255304 U CN 208255304U CN 201820757120 U CN201820757120 U CN 201820757120U CN 208255304 U CN208255304 U CN 208255304U
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Abstract
The utility model relates to a kind of electric transmission line lightning arrester dash current detection sensors, comprising: electromagnetic coil, the first TVS diode and signal conditioning circuit interconnected and micro-control unit；The both ends of electromagnetic coil are connect with the both ends of the first TVS diode correspondingly respectively；The both ends of first TVS diode are also connect with signal conditioning circuit respectively；The external detection terminal of the RS-485 interface communication of micro-control unit.Sensor internal in the utility model devises the first TVS diode, effectively inhibition surging signal, improves counting accuracy.Arrester action current is acquired and is stored by micro-control unit simultaneously, detection terminal is aloowed to read the working condition of current sensor at any time.In addition, can inhibit difference using RS-485 communication interface touches interference signal, data communication that is convenient and being reliably achieved micro-control unit and detection terminal.
Description
Technical field
The utility model relates to arrester checks technical fields, more particularly to a kind of electric transmission line lightning arrester dash current
Detection sensor.
Background technique
Important devices of the arrester as transmission line of electricity lightning protection, when transmission line of electricity is by being struck by lightning, then arrester is presented low
Impedance operator, most of energy that is struck by lightning of releasing, after lightning stroke, arrester is restored to high impedance, and this time the insulation of arrester is special
Property ensure that transmission line of electricity normal power supply.But the low impedance characteristic presented when lightning arrestor movement, for exhausted under normal condition
Edge characteristic has large effect, needs to guarantee lightning arrestor movement number within an acceptable range in industrial application, so arrester
Action frequency be always as the important evidence for judging arrester operating status.
However, the mode that conventional arrester dash current mutual inductor is all made of coil windings designs, when lightning stroke occurs,
Electromagnetic coil will output signal, pass to rear class acquisition, number of lightning strokes is detected.The design of the program is asked there are following
Topic: when 1. coil-induced thunder-strike current, electromagnetic coil will generate high voltage, generate destruction to the insulation characterisitic of mutual inductor；
2. mutual inductor output end and rear class collection terminal are all made of cable mode and carry out transmission signal, since electromagnetic coil transmitting is induction
Voltage belongs to small-signal, and since mutual inductor is mounted near high pressure, then environment for small-signal transmission when, it will
It is interfered, the reliability of transmission is not high；3. function is saved since mutual inductor itself does not have signal, once transmission signal is lost
It loses, rear class acquisition terminal will be lost current data, will will appear leakage metering number for the detection of lightning arrestor movement number, can not
Accurate detection lightning arrestor movement number.
Utility model content
Technical problem to be solved in the utility model is in view of the above shortcomings of the prior art, to provide a kind of transmission line of electricity
Arrester dash current detection sensor.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of electric transmission line lightning arrester dash current inspection
Survey sensor, comprising: electromagnetic coil, the first TVS diode and signal conditioning circuit interconnected and micro-control unit；
The both ends of the electromagnetic coil are connect with the both ends of first TVS diode correspondingly respectively；
The both ends of first TVS diode are also connect with the signal conditioning circuit respectively；
The external detection terminal of the RS-485 interface communication of the micro-control unit.
The beneficial effects of the utility model are: comparing with traditional arrester dash current mutual inductor, in the sensor
Portion devises the first TVS diode, effectively inhibition surging signal, it is ensured that lightning arrestor movement state accurate recording, avoid because
For transmission line of electricity, in lightning stroke, caused rear class acquisition terminal is possible for the leakage meter of lightning arrestor movement number, improves and keeps away
The reliability of thunder device impact conditions detection.Arrester action current is acquired and is stored by micro-control unit simultaneously, it should
Micro-control unit additionally provides one group of RS-485 communication interface, effectively difference is inhibited to touch interference signal, it is convenient and reliably with detection
Terminal carries out data communication, and due to the data storage function of micro-control unit, aloows detection terminal to read at any time and work as
The working condition of front sensor.
Based on the above technical solution, the utility model can also do following improvement.
Further, the external detection terminal of power interface electricity of the micro-control unit.
The further beneficial effect of the utility model is: micro-control unit provides power supply by external detection terminal, really
The normal work of micro-control unit is protected, so that sensor carries out safe and reliable accurately data acquisition and transmission.
Further, the RS-485+ interface of the micro-control unit and RS-485- interface communicate the external detection eventually respectively
End；
The then detection sensor further include: the second TVS diode；
One end of second TVS diode is connect with the RS-485+ interface, the other end and the RS-485- interface
Connection.
Further, the detection sensor further include: third TVS diode；
The both ends of the third TVS diode are connect with the both ends of first TVS diode correspondingly respectively.
Further, model P6KE300 (C) A of first TVS diode, the model of second TVS diode
P6KE6.8 (C) A, model P6KE300 (C) A of the third TVS diode.
The further beneficial effect of the utility model is: TVS diode is mainly according to the dynamic of actual operating voltage selection
Make main type selecting technical indicator of the voltage as TVS, electromagnetic coil is since the voltage of induction is larger, the selection of the first TVS diode
The TVS diode of P6KE300 (C) A model, 285~315V of operation voltage, for inhibiting surging signal, when both ends occurred
Ensure that coil is protected to work normally when voltage, late-class circuit is avoided to be damaged.RS-485 operating voltage is lower, selection
The TVS of P6KE6.8 (C) A model, operation voltage are 6.45~7.14V, and micro-control unit energy is ensured when overvoltage occur in both ends
It is enough to work normally, it avoids damaging.
Further, the detection sensor further include: the sampling resistor in parallel with first TVS diode.
Further, the sampling resistor is 25 Ω sampling resistors.
Further, the chip model of the micro-control unit is STM32F103.
Further, the signal conditioning circuit includes: first diode, the second diode, third diode, the four or two pole
Pipe, capacitor, first resistor and second resistance；
One end of the first resistor and the second resistance is connect with the A/D interface of the micro-control unit respectively；
The other end of the first resistor is connect with the cathode of the first diode, the first diode anode with
The cathode of second diode connects, and the anode of second diode is connect with the other end of the second resistance；
The cathode of the first diode and the other end of the first resistor also one end with the capacitor respectively
Connection, the other end ground connection of the capacitor；
The anode of the plus earth of the third diode, the cathode of the third diode and the 4th diode is even
It connects, the cathode of the 4th diode connects with the cathode of the first diode and the other end of the first resistor respectively
It connects；
The cathode of the anode of the first diode and second diode also respectively with first TVS diode
One end connection；The anode of the cathode of the third diode and the 4th diode also respectively with first TVS diode
The other end connection.
Further, the first diode, the second diode, third diode and the 4th diode are respectively HER157 bis-
Pole pipe, the capacitor are 102J630V capacitor, and the first resistor is 205 resistance, and the second resistance is 203 resistance.
The further beneficial effect of the utility model is: since the voltage signal of electromagnetic coil output will appear positive and negative anodes
Property, this is primarily due to lightning stroke voltage and is likely to occur positive and negative, and the A/D acquisition port of micro-control unit is generally merely able to acquire positive mould
Then quasi- signal passes through electric resistance partial pressure, declines to signal so signal conditioning circuit mainly rectifies the acquisition signal
Subtract, is acquired for rear class micro-control unit.
Detailed description of the invention
Fig. 1 is a kind of electric transmission line lightning arrester dash current detection sensor that the utility model one embodiment provides
Schematic block diagram；
Fig. 2 is a kind of electric transmission line lightning arrester dash current detection sensor that another embodiment of the utility model provides
Schematic block diagram；
Fig. 3 is a kind of electric transmission line lightning arrester dash current detection sensor that another embodiment of the utility model provides
Schematic block diagram.
In attached drawing, element representated by each label is listed as follows:
1, electromagnetic coil, the 2, first TVS diode, 3, signal conditioning circuit, 31, first diode, the 32, the 2nd 2 pole
Pipe, 33, third diode, the 34, the 4th diode, 35, capacitor, 36, first resistor, 37, second resistance, 4, micro-control unit,
6, terminal, the 7, second TVS diode, 8, third TVS diode, 9, sampling resistor are detected.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
Embodiment one
A kind of electric transmission line lightning arrester dash current detection sensor, as shown in Figure 1, be detection sensor in dotted line frame,
It include: electromagnetic coil 1, the first TVS diode 2 and signal conditioning circuit interconnected 3 and micro-control unit 4.Wherein,
The both ends of electromagnetic coil are connect with the both ends of the first TVS diode correspondingly respectively；The both ends of first TVS diode are also divided
It is not connect with signal conditioning circuit；The external detection terminal 6 of the RS-485 interface communication of micro-control unit.
Traditional lightning protection device mutual inductor transmits signal easy electromagnetic wave interference, while inside is not to lightning arrestor movement number number
According to being stored, once loss of data will lead to not correctly judge lightning arrestor movement number, for judging transmission line of electricity
Arrester working condition impacts.
The arrester dash current detection sensor of the present embodiment at work, when on transmission line of electricity without lightning stroke situation
When, sensor internal micro-control unit is in standby, and when on transmission line of electricity by being struck by lightning, then micro-control unit detects
Dash current on coil, is converted by A/D, and the signal is stored, the foundation as the movement of arrester dash current.
When receiving the inquiry status command of electric transmission line lightning arrester on-line checking terminal transmission on RS-485 interface, then micro-control unit
The information of storage is transferred to on-line checking terminal by RS-485 interface, it is dynamic so as to accurately acquire and transmit arrester
Make state.
It compares with traditional arrester dash current mutual inductor, which devises the first TVS diode, has
Effect inhibits surging signal, it is ensured that lightning arrestor movement state accurate recording avoids because transmission line of electricity is led in lightning stroke
The rear class acquisition terminal of cause is possible for the leakage meter of lightning arrestor movement number, improves the reliable of arrester impact conditions detection
Property.Arrester action current is acquired and is stored by micro-control unit simultaneously, which additionally provides one group
RS-485 communication interface effectively inhibits difference to touch interference signal, convenient and data communication is reliably carried out with detection terminal, and due to
The data storage function of micro-control unit aloows detection terminal to read the working condition of current sensor at any time.
Wherein, it since the signal of electromagnetic coil output will appear positive-negative polarity, is primarily due to lightning stroke voltage and is likely to occur just
It is negative, and the A/D acquisition port (such as A/D acquisition interface of STM32F103 chip) of micro-control unit is generally merely able to acquisition anode
Then analog signal passes through electric resistance partial pressure so signal conditioning circuit mainly rectifies the acquisition signal, carry out to signal
Decaying is acquired for rear class micro-control unit.
Embodiment two
On the basis of example 1, the external detection terminal of power interface electricity of micro-control unit.
Micro-control unit provides power supply by external detection terminal, it is ensured that the normal work of micro-control unit, so that
Sensor carries out safe and reliable accurately data acquisition and transmission.
Embodiment three
On the basis of embodiment one or embodiment two, as shown in Fig. 2, micro-control unit passes through RS-485+ interface respectively
With the external detection terminal of RS-485- interface communication.
Then detection sensor further include: the second TVS diode 7；One end of second TVS diode and RS-485+ interface connect
It connects, the other end is connect with RS-485- interface.
In order to inhibit surging signal, guarantee that micro-control unit will can accurately and reliably collect the dash current of arrester
Signal is transferred to detection terminal, connects TVS diode in RS-485 interface, ensure that data reliability.
Preferably, detection sensor further include: third TVS diode 8.The both ends difference one of third TVS diode 8 is a pair of
That answers connect with the both ends of the first TVS diode 2.
Preferably, model P6KE300 (C) A of the first TVS diode, the model P6KE6.8 of the second TVS diode
(C) A, model P6KE300 (C) A of third TVS diode.
The operation voltage that TVS diode is mainly selected according to actual operating voltage refers to as the main type selecting technology of TVS
Mark, for electromagnetic coil since the voltage of induction is larger, the first TVS diode has selected the TVS diode of P6KE300 (C) A model,
285~315V of operation voltage ensures that coil is protected to work normally when overvoltage occur in both ends, keeps away for inhibiting surging signal
Exempt from late-class circuit to be damaged.RS-485 operating voltage is lower, has selected the TVS of P6KE6.8 (C) A model, and operation voltage is
6.45~7.14V ensures that micro-control unit can be worked normally when overvoltage occur in both ends, avoids damaging.
Example IV
On the basis of any embodiment into embodiment three of embodiment one, as shown in figure 3, detection sensor further include:
The sampling resistor 9 in parallel with the first TVS diode.
Preferably, sampling resistor 9 is 25 Ω sampling resistors.
Preferably, the chip model of micro-control unit is STM32F103.
Preferably, signal conditioning circuit 3 includes: first diode 31, the second diode 32, third diode 33, and the 4th
Diode 34, capacitor 35, first resistor 36 and second resistance 37.Wherein,
One end of first resistor 36 and second resistance 37 is connect with the A/D interface of micro-control unit respectively；First resistor 36
The other end connect with the cathode of first diode 31, first diode 31 anode connect with the cathode of the second diode 32,
The anode of second diode 32 is connect with the other end of second resistance 37；The cathode of first diode 31 and first resistor 36 it is another
One end is also connect with one end of capacitor 35 respectively, the other end ground connection of capacitor 35；The plus earth of third diode 33, the three or two
The cathode of pole pipe 33 is connect with the anode of the 4th diode 34, and the cathode of the 4th diode 34 is negative with first diode 31 respectively
Pole is connected with the other end of first resistor 36；The anode of first diode 31 and the cathode of the second diode 32 are also respectively with first
One end of TVS diode connects；The anode of the cathode of third diode 33 and the 4th diode 34 also respectively with bis- pole the first TVS
The other end of pipe connects.
Preferably, first diode 31, the second diode 32, third diode 33 and the 4th diode 34 are respectively
HER157 diode, capacitor 35 are 102J630V capacitor 35, and first resistor 36 is 205 resistance, and second resistance 37 is 203 resistance.
Since the voltage signal of electromagnetic coil output will appear positive-negative polarity, this is primarily due to lightning stroke voltage and is likely to occur just
It is negative, and the A/D acquisition port (such as A/D acquisition interface of STM32F103 chip) of micro-control unit is generally merely able to acquisition anode
Then analog signal passes through electric resistance partial pressure so signal conditioning circuit mainly rectifies the acquisition signal, carry out to signal
Decaying is acquired for rear class micro-control unit.
For example, a kind of internal frame diagram of electric transmission line lightning arrester dash current mutual inductor.
Electromagnetic coil is mainly used for incuding arrester dash current, when dash current flows through air core coil (arrester line)
When, then electromagnetic coil end can generate induced voltage, acquire for rear class micro-control unit, and the electromagnetic coil in the present embodiment uses
Ferrite uses line footpath for the enameled wire of 0.5mm as core material, 400 circle of coiling.
The electromagnetic coil rear class the first TVS diode in parallel, for inhibiting surging signal, the first TVS diode device
Operation voltage be 285~315V, leakage current 57A, late-class circuit is protected.Secondly, first TVS diode
2.2 Ω high precision sampling resistances of both ends parallel connection.Wherein, TVS diode is mainly according to the movement electricity of actual operating voltage selection
The main type selecting technical indicator as TVS is pressed, since the voltage of induction is larger, the first TVS diode selects electromagnetic coil
The TVS diode of P6KE300 (C) A model, 285~315V of operation voltage.
The dash current signal that secondary coil senses is converted into direct current by the rectifier circuit of rear class, is admitted to
The A/D acquisition port of STM32F103 chip, A/D acquisition port is acquired the direct current signal, and is stored.
External detection terminal can carry out data communication by RS-485 interface, when detection terminal is to STM32F103 chip
When sending request of data, which is transferred to the detection terminal by RS-485 interface by STM32F103 chip, wherein
Since RS-485 interface uses differential signal negative logic, effectively difference is inhibited to touch interference signal.
Specifically, RS-485 agreement is made of data packet, data packet is divided into multiple data frames and is sent, each data
8 bytes of frame.
By providing setting to data frame domain position and length, at the same entire frame end using verify and by the way of,
Guarantee the validity and reliability of transmission data.
Secondly, the input interface in the transmission signal line of STM32F103 chip communicated with detection terminal terminates the 2nd TVS
Diode, model P6KE6.8 (C) A, operation voltage is 6.45~7.14V, when having coupled larger interference on transmission signal line
When, interference is filtered out by the TVS diode device, protects mutual inductor internal circuit.
In addition, STM32F103 chip has one group of power interface, powered by external power supply directly to micro-control unit,
To support STM32F103 chip that can complete the acquisition, storage and data-transformation facility of arrester dash current.
And micro control unit circuit mainly completes the acquisition of analog signal and the transfer function of data, when lightning stroke impact electricity
When stream occurs, to collection of simulant signal, is converted to digital signal and is stored, when RS-485 interface detects signal and determination
For transmission useful signal when, then the signal of storage is sent to rear end.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (10)
1. a kind of electric transmission line lightning arrester dash current detection sensor characterized by comprising electromagnetic coil (1), first
TVS diode (2) and signal conditioning circuit interconnected (3) and micro-control unit (4)；
The both ends of the electromagnetic coil (1) are connect with the both ends of first TVS diode (2) correspondingly respectively；
The both ends of first TVS diode (2) are also connect with the signal conditioning circuit (3) respectively；
The external detection terminal (6) of the RS-485 interface communication of the micro-control unit (4).
2. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 1, which is characterized in that described
The external detection terminal (6) of power interface electricity of micro-control unit (4).
3. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 2, which is characterized in that described
The RS-485+ interface and RS-485- interface of micro-control unit (4) communicate the external detection terminal (6) respectively；
The then detection sensor further include: the second TVS diode (7)；
One end of second TVS diode (7) is connect with the RS-485+ interface, and the other end and the RS-485- interface connect
It connects.
4. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 3, which is characterized in that described
Detection sensor further include: third TVS diode (8)；
The both ends of the third TVS diode (8) are connect with the both ends of first TVS diode (2) correspondingly respectively.
5. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 4, which is characterized in that described
Model P6KE300 (C) A of first TVS diode (2), model P6KE6.8 (C) A of second TVS diode (7),
Model P6KE300 (C) A of the third TVS diode (8).
6. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 1, which is characterized in that described
Detection sensor further include: the sampling resistor (9) in parallel with the first TVS diode (2).
7. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 6, which is characterized in that described
Sampling resistor (9) is 25 Ω sampling resistors.
8. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 1, which is characterized in that described
The chip model of micro-control unit (4) is STM32F103.
9. according to a kind of described in any item electric transmission line lightning arrester dash current detection sensors of claim 4-5, feature
It is, the signal conditioning circuit (3) includes: first diode (31), the second diode (32), third diode (33), and
Four diodes (34), capacitor (35), first resistor (36) and second resistance (37)；
One end of the first resistor (36) and the second resistance (37) A/D interface with the micro-control unit (4) respectively
Connection；
The other end of the first resistor (36) is connect with the cathode of the first diode (31), the first diode (31)
Anode connect with the cathode of second diode (32), the positive and second resistance of second diode (32)
(37) other end connection；
The cathode of the first diode (31) and the other end of the first resistor (36) also respectively with the capacitor
(35) one end connection, the other end ground connection of the capacitor (35)；
The plus earth of the third diode (33), the cathode of the third diode (33) and the 4th diode (34)
Anode connection, the cathode of the 4th diode (34) respectively with the cathode of the first diode (31) and it is described first electricity
Hinder the other end connection of (36)；
The anode of the first diode (31) and the cathode of second diode (32) also with first TVS diode
(2) it is connected with one end of the third TVS diode (8)；The cathode and the 4th diode of the third diode (33)
(34) anode is also connect with the other end of first TVS diode (2) and the third TVS diode (8).
10. a kind of electric transmission line lightning arrester dash current detection sensor according to claim 9, which is characterized in that institute
Stating first diode (31), the second diode (32), third diode (33) and the 4th diode (34) is respectively HER157 bis-
Pole pipe, the capacitor (35) are 102J630V capacitor (35), and the first resistor (36) is 205 resistance, the second resistance
It (37) is 203 resistance.
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| CN201820757120.XU CN208255304U (en) | 2018-05-21 | 2018-05-21 | A kind of electric transmission line lightning arrester dash current detection sensor |
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| CN201820757120.XU CN208255304U (en) | 2018-05-21 | 2018-05-21 | A kind of electric transmission line lightning arrester dash current detection sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596482A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line lightning arrester detection system based on inductive power supply and detection method thereof |
| RU203605U1 (en) * | 2021-01-20 | 2021-04-14 | Евгений Валерьевич Чкалин | Acoustic baffle stand |
| RU204516U1 (en) * | 2020-11-23 | 2021-05-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Рязанский государственный радиотехнический университет им. В.Ф. Уткина" | DEVICE FOR CHARGING HIGH-VOLTAGE LARGE CAPACITY CAPACITORS WITH PULSE TRANSFORMER |
| CN115219764A (en) * | 2022-07-11 | 2022-10-21 | 上海钧嵌传感技术有限公司 | Pulse current protection circuit and method for current sensor and current sensor |
-
2018
- 2018-05-21 CN CN201820757120.XU patent/CN208255304U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596482A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line lightning arrester detection system based on inductive power supply and detection method thereof |
| RU204516U1 (en) * | 2020-11-23 | 2021-05-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Рязанский государственный радиотехнический университет им. В.Ф. Уткина" | DEVICE FOR CHARGING HIGH-VOLTAGE LARGE CAPACITY CAPACITORS WITH PULSE TRANSFORMER |
| RU203605U1 (en) * | 2021-01-20 | 2021-04-14 | Евгений Валерьевич Чкалин | Acoustic baffle stand |
| CN115219764A (en) * | 2022-07-11 | 2022-10-21 | 上海钧嵌传感技术有限公司 | Pulse current protection circuit and method for current sensor and current sensor |
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