CN104793086A - Fully-isolated online lightning arrester monitoring device - Google Patents
Fully-isolated online lightning arrester monitoring device Download PDFInfo
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- CN104793086A CN104793086A CN201510203810.1A CN201510203810A CN104793086A CN 104793086 A CN104793086 A CN 104793086A CN 201510203810 A CN201510203810 A CN 201510203810A CN 104793086 A CN104793086 A CN 104793086A
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Abstract
The invention discloses a fully-isolated online lightning arrester monitoring device and relates to the technical field of power system automation. The fully-isolated online lightning arrester monitoring device comprises a power supply, three isolated current-voltage sensors, an AD conversion module, a microcontroller and a displayer, voltage signal output ends of the isolated current-voltage sensors are sequentially connected with a first amplitude limiter, a first pre-amplifier and a phase comparator serially and then connected with an input end of the microcontroller, current signal output ends of the isolated current-voltage sensors are sequentially connected with a second amplitude limiter, a third amplitude limiter and a second pre-amplifier serially and then connected with the AD conversion module, an output end of the AD conversion module is connected with the microcontroller, and an output end of the second pre-amplifier is connected with an input end of the phase comparator. Voltage detection portions of the isolated current-voltage sensors monitor strength of an electric field around a lightning arrester and accurately reflects disturbance, to the electric field of the lightning arrester, of electrified bodies around the lighting arrester; the fully-isolated online lightning arrester monitoring device is more accurate and reliable, needless of on-site correction and convenient to use when being used for measuring resistive current.
Description
Technical field
The present invention relates to power system automation technology field, be specially a kind of lightning arrester on-Line Monitor Device of full isolation.
Background technology
The problems such as current lightning arrester on-line monitoring generally adopts zinc oxide valve plate to carry out thunderbolt impulse sampling, measures full leakage current, there is precision low with milliammeter, and security is not high, and switch cubicle assembling is complicated.
The on-Line Monitor Device of Current electronic formula is many without counting thunder function; Have counting thunder function and the main accessory power supply that relies on power, when power supply power-fail or fault, counting thunder function also can be lost.
On-Line Monitor Device many employings fft algorithm of Current electronic formula resolves current in resistance property, because current in resistance property is very little, approximately only have circuital about 1%, therefore precision will be improved, to the precision of ADC and the processing power of CPU, propose higher requirement, cost is higher, and the popularization limiting electronic type line monitoring device should.
Current electronic formula on-Line Monitor Device voltage sample generally adopts the voltage sensor of PT or contact, and add system complexity, cost is higher.Voltage sample can not reflect the true electric field status of lightning arrester.Therefore use and need field calibration, program is loaded down with trivial details, also limit applying of electronic type line monitoring device.
Summary of the invention
The present invention proposes a kind of lightning arrester on-line measuring device of full isolation, this pick-up unit security is high, the electric current that isolated current/voltage sensor gathers, voltage signal, after amplifier, passes through AD conversion module, deliver to microcontroller, the leakage total current of lightning arrester can be calculated.
The technical scheme realizing above-mentioned purpose is: a kind of lightning arrester on-Line Monitor Device of full isolation, it is characterized in that: comprise power supply, three isolated current/voltage sensors, AD conversion module, microcontroller and display, connect the input end of microcontroller after the voltage signal output end of described three isolated current/voltage sensors is connected in series the first limiter, the first prime amplifier, phase comparator successively; AD conversion module is connected after the current signal output end of described three isolated current/voltage sensors is connected in series the second limiter, the 3rd limiter, the second prime amplifier respectively successively, the output terminal of AD conversion module connects microcontroller, and the output terminal of the second prime amplifier connects with the phase comparator input end that corresponding isolated current/voltage sensor output connects simultaneously; Described display is connected with microcontroller; Described three isolated current/voltage sensors, three the first limiters, three the second limiters, three the 3rd limiters, three the first prime amplifiers, three the second prime amplifiers, three phase comparators, AD conversion module, display and microcontrollers are all powered by power supply.
Described microcontroller is also connected with keyboard, and keyboard is powered by power supply.
Described microcontroller is provided with 485 communication interfaces, and the output terminal of microcontroller is connected with the anti-signal output interface in locking/5 by relay.
The output terminal of described microcontroller is also connected with the selftest module of being powered by power supply, the input end of three the first limiters and the 3rd limiter is also connected with the output terminal of selftest module respectively, also be serially connected with a resistance and first electric capacity respectively successively between the output terminal of selftest module and three the 3rd limiters, between the output terminal of selftest module and three the first limiters, be also serially connected with second electric capacity respectively.
Described selftest module is the signal generator of 50Hz.
Described power supply comprises Switching Power Supply, and the output terminal of Switching Power Supply is connected with charge controller, and the input end of charge controller is also connected with lithium battery.
Be parallel with a rectifier bridge respectively between first limiter of the current signal output end serial connection of three isolated current/voltage sensors and the second limiter, be connected with the input end of microcontroller after the output terminal of three rectifier bridges is connected in series the first diode respectively; The output terminal of three rectifier bridges is also connected in series the second diode respectively, and the output terminal of three the second diodes also connects the positive pole of a rear connection storage capacitor, and the positive pole of storage capacitor also connects the input end of charge controller, the minus earth of storage capacitor simultaneously.
Described three isolated current/voltage sensors are identical, comprise an annular current transformer, current transformer passes through epoxy encapsulation, epoxy resin one side end face is equipped with ring-type first electrode for voltage sample, and epoxy resin opposite side end face is equipped with ring-type second electrode for ground connection.
Principle of work of the present invention:
Isolated current/voltage sensor of the present invention is a ring assembling structure, is enclosed within lightning arrester bottom to be monitored.
Three road current signals of three isolated current/voltage sensor inputs, deliver to the second prime amplifier by the second limiter, the 3rd limiter, and when second, third two-stage limiter occurs for being struck by lightning, restricting signal is unlikely to damage second prime amplifier.Three road voltage signal voltage signals of three isolated current/voltage sensor inputs deliver to the first prime amplifier by the first limiter.
The current and voltage signals that first, second prime amplifier exports generates the pulse width signal relevant to phase differential by phase comparator, and deliver to microcontroller, current signal converts digital signal to through AD conversion module and send microcontroller.
Microcontroller, by carrying out integrated square to the current sampling signal of numeral, calculates and leaks total current value.Measure phase signal, calculate phase differential Φ, calculating lightning arrester leakage current in resistance property is further I total current sin Φ.And the performance of lightning arrester is judged according to the size of leaking current in resistance property, when leaking current in resistance property and being greater than threshold value, drive relay to send block signal.
When occurring when being struck by lightning, isolated current/voltage sensor can detect the pulse signal of big current, and the second limiter works, and is limited within the scope of supply voltage by its amplitude, and deliver to microcontroller interrupt pin by rectifier bridge, the first diode, notice microcontroller counting thunderbolt event.If at that time without working power, the signal of isolated current/voltage sensor sensing by rectifier bridge to Power supply, can wake microcontroller up and carried out counting thunder, thus can not miss thunderbolt event.
Beneficial effect of the present invention: three isolated current/voltage sensors of the present invention are a ring assembling structure, are enclosed within lightning arrester low side to be monitored.A current transformer is had, for the leakage current of lightning arrester of sampling in this isolated current/voltage sensor.Respectively there is the electrode of a ring dress in the upper and lower of isolated current/voltage sensor, for voltage sample and ground connection, form the voltage sensor of an induction type.Isolated current/voltage sensor and lightning arrester primary circuit completely isolated, enhance the security of this pick-up unit.The current detection section of isolated current/voltage sensor has monitored the electric field intensity around this lightning arrester, around accurate response lightning arrester, electrified body is to the electric field perturbations of lightning arrester, when measuring current in resistance property, more accurately and reliably, need not straightened up in place, use more convenient.
Electric current, voltage signal that isolated current/voltage sensor of the present invention gathers, respectively after prime amplifier, by AD conversion module, deliver to microcontroller, can calculate the leakage total current of lightning arrester.
Voltage, current signal, through phase comparator, detect difference, calculate phase differential Φ through microcontroller, and it is I that lightning arrester leaks current in resistance property
total currentsin Φ.Measured by the method and leak current in resistance property, precision is high, and speed is fast, and without the need to carrying out FFT exchange, lower to the requirement of microcontroller, cost is lower.
Three in the present invention isolated current/voltage sensor, three the second limiters, three rectifier bridges, three the first diodes and microcontroller form lightning stroke counter function.
The present invention adopts rechargeable lithium battary to power as standby power supply, is powered under normal circumstances by accessory power supply, and charges the battery.When accessory power supply power down, by lithium battery power supply.Can long-term work and Maintenance free.
Three in the present invention isolated current/voltage sensor, three rectifier bridges, three the second diodes and energy storage capacitor define thunderbolt power taking loop, when occurring when being struck by lightning, the leakage current that flows through in lightning arrester can be gathered as power supply, wake the microcontroller of low-power consumption up, record current thunderbolt event.It is standby for a long time that this invention can solve monitoring device, depleted the storage electricity of battery electricity, lost the problem of thunderbolt event recording function.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention;
Fig. 2 is the structural representation of isolated current/voltage sensor.
Embodiment
As shown in Figure 1, the present invention includes power supply 1, three isolated current/voltage sensors 2, AD conversion module 3, keyboard 12, microcontroller 4 and display 5.
The voltage signal output end of three isolated current/voltage sensors 2 is connected in series the first limiter 6, first prime amplifier 7, the rear input end connecting microcontroller 4 of phase comparator 8 successively; The current signal output end of three isolated current/voltage sensors 2 is connected in series the second limiter 9, the 3rd limiter 10, second prime amplifier 11 rear connection AD conversion module 3 respectively successively, the input end of the phase comparator 8 that the output terminal that the output terminal of AD conversion module 3 connects microcontroller 4, second prime amplifier 11 connects with corresponding isolated current/voltage sensor 2 output terminal simultaneously connects; Display 5, keyboard 12 are connected with microcontroller 4, and microcontroller 4 is provided with 485 communication interfaces 15, and the output terminal of microcontroller 4 is connected with the anti-signal output interface 14 in locking/5 by relay 13.
Three isolated current/voltage sensors, 2, three the first limiters, 6, three the second limiters, 9, three the 3rd limiters 10, keyboard 12, three the first prime amplifiers 7, three the second prime amplifiers 11, three phase comparators 8, AD conversion module 3, display and 5 microcontrollers 4 are all powered by power supply.
The output terminal of microcontroller 4 is also connected with the selftest module 16 of being powered by power supply 1, and selftest module 16 is the signal generator of 50Hz; The input end of three the first limiters 6 and the 3rd limiter 9 is also connected with the output terminal of selftest module 16 respectively, also be serially connected with a resistance 17 and first electric capacity 18 between the output terminal of selftest module 16 and three the 3rd limiters 9 respectively successively, between the output terminal of selftest module 16 and three the first limiters 6, be also serially connected with second electric capacity 19 respectively.
Power supply 1 comprises Switching Power Supply 20, and the output terminal of Switching Power Supply 20 is connected with charge controller 21, and the input end of charge controller 21 is also connected with lithium battery 22.
The output terminal being parallel with a rectifier bridge 23, three rectifier bridges 23 between second limiter 9 of the current signal output end serial connection of three isolated current/voltage sensors 2 and the 3rd limiter 10 is respectively connected in series the first diode 24 respectively and is connected with the input end of microcontroller 4 afterwards; The output terminal of three rectifier bridges 23 is also connected in series the second diode 25 respectively, the output terminal of three the second diodes 25 also connects the positive pole of a rear connection storage capacitor 26, the positive pole of storage capacitor 26 also connects the input end of charge controller 21, the minus earth of storage capacitor 26 simultaneously.
As shown in Figure 2, three isolated current/voltage sensors 2 are identical, comprise an annular current transformer 27, current transformer 27 is encapsulated by epoxy resin 30, current transformer 27 comprises toroidal core 28 and is wound on the coil 29 on toroidal core 28, epoxy resin 30 1 side end face is equipped with ring-type first electrode 31 for voltage sample, and the opposite side end face of epoxy resin 30 is equipped with ring-type second electrode 32 for ground connection.
Claims (8)
1. a lightning arrester on-Line Monitor Device of entirely isolating, it is characterized in that: comprise power supply, three isolated current/voltage sensors, AD conversion module, microcontroller and display, connect the input end of microcontroller after the voltage signal output end of described three isolated current/voltage sensors is connected in series the first limiter, the first prime amplifier, phase comparator successively; AD conversion module is connected after the current signal output end of described three isolated current/voltage sensors is connected in series the second limiter, the 3rd limiter, the second prime amplifier respectively successively, the output terminal of AD conversion module connects microcontroller, and the output terminal of the second prime amplifier connects with the phase comparator input end that corresponding isolated current/voltage sensor output connects simultaneously; Described display is connected with microcontroller; Described three isolated current/voltage sensors, three the first limiters, three the second limiters, three the 3rd limiters, three the first prime amplifiers, three the second prime amplifiers, three phase comparators, AD conversion module, display and microcontrollers are all powered by power supply.
2. the lightning arrester on-Line Monitor Device of a kind of full isolation according to claim 1, is characterized in that: described microcontroller is also connected with keyboard, and keyboard is powered by power supply.
3. the lightning arrester on-Line Monitor Device of a kind of full isolation according to claim 1, is characterized in that: described microcontroller is provided with 485 communication interfaces, and the output terminal of microcontroller is connected with the anti-signal output interface in locking/5 by relay.
4. the lightning arrester on-Line Monitor Device of a kind of full isolation according to claim 1, it is characterized in that: the output terminal of described microcontroller is also connected with the selftest module of being powered by power supply, the input end of three the first limiters and the 3rd limiter is also connected with the output terminal of selftest module respectively, also be serially connected with a resistance and first electric capacity respectively successively between the output terminal of selftest module and three the 3rd limiters, between the output terminal of selftest module and three the first limiters, be also serially connected with second electric capacity respectively.
5. a kind of induction type electric display device according to claim 4, is characterized in that: described selftest module is the signal generator of 50Hz.
6. the lightning arrester on-Line Monitor Device of a kind of full isolation according to claim 1, it is characterized in that: described power supply comprises Switching Power Supply, the output terminal of Switching Power Supply is connected with charge controller, and the input end of charge controller is also connected with lithium battery.
7. the lightning arrester on-Line Monitor Device of a kind of full isolation according to claim 6, it is characterized in that: between the second limiter of the current signal output end of three isolated current/voltage sensors serial connection and the 3rd limiter, be parallel with a rectifier bridge respectively, be connected with the input end of microcontroller after the output terminal of three rectifier bridges is connected in series the first diode respectively; The output terminal of three rectifier bridges is also connected in series the second diode respectively, and the output terminal of three the second diodes also connects the positive pole of a rear connection storage capacitor, and the positive pole of storage capacitor also connects the input end of charge controller, the minus earth of storage capacitor simultaneously.
8. the lightning arrester on-Line Monitor Device of a kind of full isolation according to any one of claim 1-7, it is characterized in that: described three isolated current/voltage sensors are identical, comprise an annular current transformer, current transformer passes through epoxy encapsulation, epoxy resin one side end face is equipped with ring-type first electrode for voltage sample, and epoxy resin opposite side end face is equipped with ring-type second electrode for ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510203810.1A CN104793086A (en) | 2015-04-27 | 2015-04-27 | Fully-isolated online lightning arrester monitoring device |
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| CN201510203810.1A CN104793086A (en) | 2015-04-27 | 2015-04-27 | Fully-isolated online lightning arrester monitoring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119263A (en) * | 2015-08-10 | 2015-12-02 | 国网浙江省电力公司湖州供电公司 | Microcomputer anti-error device through monitoring leakage current of arrester |
| CN105954574A (en) * | 2016-07-22 | 2016-09-21 | 安徽亚辉电气自动化有限公司 | Measurement and control system for switch cabinet zero-sequence current |
| CN105954634A (en) * | 2016-07-22 | 2016-09-21 | 安徽亚辉电气自动化有限公司 | Online monitoring device for lightning arrester |
| CN112816806A (en) * | 2020-08-28 | 2021-05-18 | 苏州灵成电气有限公司 | Zinc oxide arrester test system and calibration method |
| CN115060963A (en) * | 2022-08-17 | 2022-09-16 | 天津七六四通信导航技术有限公司 | Circuit for detecting current voltage of radio frequency front end of receiver and implementation method |
-
2015
- 2015-04-27 CN CN201510203810.1A patent/CN104793086A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119263A (en) * | 2015-08-10 | 2015-12-02 | 国网浙江省电力公司湖州供电公司 | Microcomputer anti-error device through monitoring leakage current of arrester |
| CN105119263B (en) * | 2015-08-10 | 2018-05-22 | 国网浙江省电力公司湖州供电公司 | A kind of Computer-lock Device For Preventing Incorrect Operation Used by monitoring arrester Leakage Current |
| CN105954574A (en) * | 2016-07-22 | 2016-09-21 | 安徽亚辉电气自动化有限公司 | Measurement and control system for switch cabinet zero-sequence current |
| CN105954634A (en) * | 2016-07-22 | 2016-09-21 | 安徽亚辉电气自动化有限公司 | Online monitoring device for lightning arrester |
| CN112816806A (en) * | 2020-08-28 | 2021-05-18 | 苏州灵成电气有限公司 | Zinc oxide arrester test system and calibration method |
| CN115060963A (en) * | 2022-08-17 | 2022-09-16 | 天津七六四通信导航技术有限公司 | Circuit for detecting current voltage of radio frequency front end of receiver and implementation method |
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Application publication date: 20150722 |
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