CN205484566U - High -voltage board insulation resistance detection device - Google Patents

High -voltage board insulation resistance detection device Download PDF

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Publication number
CN205484566U
CN205484566U CN201620245394.1U CN201620245394U CN205484566U CN 205484566 U CN205484566 U CN 205484566U CN 201620245394 U CN201620245394 U CN 201620245394U CN 205484566 U CN205484566 U CN 205484566U
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voltage
unit
current
conversion unit
signal
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CN201620245394.1U
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淮琳
杨振江
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Xi'an Tongchuang Electric Power Equipment Automatic Control Engineering Co ltd
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Xi'an Tongchuang Electric Power Equipment Automatic Control Engineering Co ltd
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Abstract

The utility model relates to a high -voltage board insulation resistance detection device, characterized by: at least, include: voltage conversion unit, high -voltage board insulation test spare, voltage sample unit, current sample unit, DC voltage converting unit, direct current converting unit, 2 way analog switch, mould / number translation unit, central processing unit unit, data translation unit, filtering unit, insulation test 1, insulation test 2, 485 interfaces. The device detects the insulated isolation resistance in the high -voltage board through the high accuracy testing to high -voltage board insulated isolation resistance promptly to it carries out big data optimization processing to transmit the resistance resistance data that detect to high in the clouds through data network. The digitization of solving high -voltage board insulated isolation resistance data measurement, the networking.

Description

A kind of high-voltage board insulation resistance detection device
Technical field
This utility model relates to electronic signal detection field, particularly to a kind of high-voltage board insulation resistance detection device.
Background technology
Owing to being limited by mounting condition, the structure small of high-tension switch cabinet, internal structure is compact, the alternate and distance to the ground of electrical body reduces, and therefore requires the most of a relatively high to environmental factors etc..By drying making, the reason such as running environment, spy is during 5 June and 10 November, and sky air Temperature Difference is relatively big, and switch cubicle easily forms condensation.In high humidity environment, the insulating properties of air dielectric are greatly reduced, and high-field electrode is very easy to shelf depreciation in humidity environment simultaneously;Solid insulating material is under high humidity environment, and its insulating properties there occurs great changes, and under the influence of shelf depreciation, the aging easy acceleration of solid insulating material, and the voltage ageing of solid insulating material and environmental aging are the most irreversible.Therefore, switch cubicle runs in high humility, high pollution environment for a long time and there is the biggest insulation fault hidden danger.
Additionally inside switch cabinet structure there is also protection against the tide, dehumidifying defect: first in cabinet electrical body alternate and over the ground air apart from too small, owing to air insulation distance is obviously reduced, between electrical body and ground or electrical body, electric field intensity significantly increases, and the position office of easily causing such as insulating part or electrical body tip, burr puts and exceeds standard;In the case of air humidity is more compared with big, dust, discharging even more serious, long-time electric discharge cumulative function is by damages insulation;The internal overvoltage and 35 kV, 10 kV systems mostly occur, easily causes the catastrophe failures such as insulation breakdown short circuit, switch cubicle damage.Secondly cabinet degree of protection is low, sealing is poor.It is poor that cabinet designs and produces manufacturability, and when electrically installing with cable outlet, switch cubicle cable enters to offer sacriffices to the gods or the spirits of the dead place's closure imprecision, and underground moisture is easily invaded in cabinet by hole.Moisture can not timely and effective be discharged, and causes cabinet integral insulation to reduce.
In order to understand the insulating properties of high-voltage board in real time and effectively grasp the safe handling situation of high-voltage board, need to monitor in real time the size of high-voltage board insulation resistance, it is thus possible to grasp the security performance situation of high-voltage board on the whole.
Summary of the invention
The purpose of this utility model is to provide a kind of high-voltage board insulation resistance detection device, in order to solves the digitized that high-voltage board insulation resistance data is measured, networking, processes for the big data in network high in the clouds and provide the data acquisition of bottom.
The purpose of this utility model is realized in, a kind of high-voltage board insulation resistance detection device, is characterized in that: at least include: voltage conversion unit, high-voltage board Insulation test part, voltage sampling unit, current sampling unit, DC voltage conversion unit, DC current converter unit, 2 path analoging switch, A/D converter, central processor unit, Date Conversion Unit, filter unit, data display unit, data communication unit, 485 interfaces;Two outfans of voltage conversion unit electrically connect with two inputs of high-voltage board isolation resistance respectively;Two inputs of voltage conversion unit electrically connect with two inputs of voltage sampling unit respectively;The outfan of voltage sampling unit is connected with DC voltage conversion unit;The outfan of current sampling unit electrically connects with the input of DC current converter unit;The input electrical connection of DC voltage conversion unit and the outfan of DC current converter unit and 2 path analoging switch;The outfan of 2 path analoging switch electrically connects with the input of analog signal conversion unit;The outfan of analog signal conversion unit electrically connects with the I/O mouth of central processor unit;The control end controlling mouth and 2 path analoging switch, analog signal conversion unit of central processor unit electrically connects;Central processor unit is electrically connected with data display unit, data communication unit by I/O mouth respectively;Data communication unit and the electrical connection of 485 interfaces.
Described voltage conversion unit is made up of boost configuration circuit, and work the high voltage being power supply 220V input voltage is increased to 10KV by a certain percentage.
Described high-voltage board isolation resistance, is i.e. dielectrically separated from resistance on high-voltage board.
Described voltage sampling unit is made up of ac voltage signal harvester, and the effect of ac voltage signal harvester gathers the value of low supply voltage signal exactly and is transported to subsequent cell and processes.
Described current sampling unit is made up of the current transformer of 0 ~ 100A, a resistance R is accessed between two pins of current transformer, by one end ground connection of resistance R, another terminates voltage signal detecting system, measured terminal voltage V of resistance R by voltage signal detecting system, then just can draw, divided by the resistance of resistance R, the current signal size that current transformer is measured by terminal voltage V measured.
Described DC voltage conversion unit is made up of RMS conversion device, and its effect is that the ac voltage signal that aforesaid voltage detector unit detects is converted into the d. c. voltage signal required for subsequent voltage processing system.
Described DC current converter unit is made up of RMS conversion device and precision resister, and its effect is that the ac current signal that aforementioned currents detector unit detects is converted into the DC current signal required for subsequent voltage processing system.
Described 2 path analoging switch use dual power supply, and wherein forward supply voltage is+9V, and negative sense supply voltage is-5V.
Described A/D converter uses 24 A/D conversion chip ADS1110 of AD company.
Described central processor unit is single-chip microcomputer and minimum system thereof, and Single Chip Microcomputer (SCM) system uses the STC15W408AS that STC Corporation produces;Described data display unit is made up of 48 Digital sum pipes and driving chip, and driving chip model is MAX7219;Described data communication unit uses RS485 communications protocol to carry out communication.
The utility model has the advantages that: by high-voltage board being dielectrically separated from the high precision test of resistance, i.e. the resistance that is dielectrically separated from a high-voltage board is detected, and the resistance data detected are carried out big data-optimized process by data network transmission to high in the clouds.Solve high-voltage board and be dielectrically separated from the digitized that resistance data is measured, networking.
Accompanying drawing explanation
Below in conjunction with embodiment accompanying drawing, the utility model is described in further detail:
Fig. 1 is this utility model embodiment circuit theory diagrams;
In figure, 1, voltage conversion unit;2, high-voltage board Insulation test part;3, voltage sampling unit;4, current sampling unit;5, DC voltage conversion unit;6, DC current converter unit;7,2 path analoging switch;8, A/D converter;9, central processor unit;10, Date Conversion Unit;11, filter unit;12, data display unit;13, data communication unit;14,485 interface.
Detailed description of the invention
As shown in Figure 1, a kind of high-voltage board insulation resistance detection device, is characterized in that: at least include: voltage conversion unit 1, high-voltage board Insulation test part 2, voltage sampling unit 3, current sampling unit 4, DC voltage conversion unit 5, DC current converter unit 6,2 path analoging switch 7, A/D converter 8, central processor unit 9, Date Conversion Unit 10, filter unit 11, data display unit 12, data communication unit 13,485 interface 14;Two outfans of voltage conversion unit 1 electrically connect with two inputs of high-voltage board isolation resistance 2 respectively;Two inputs of voltage conversion unit 1 electrically connect with two inputs of voltage sampling unit 3 respectively;The outfan of voltage sampling unit 3 is connected with DC voltage conversion unit 5;The outfan of current sampling unit 4 electrically connects with the input of DC current converter unit 6;The input electrical connection of DC voltage conversion unit 5 and the outfan of DC current converter unit 6 and 2 path analoging switch 7;The outfan of 2 path analoging switch 7 electrically connects with the input of analog signal conversion unit 8;The outfan of analog signal conversion unit 8 electrically connects with the I/O mouth of central processor unit 9;The control end controlling mouth and 2 path analoging switch 7, analog signal conversion unit 8 of central processor unit 9 electrically connects;Central processor unit 9 is electrically connected with data display unit 12, data communication unit 13 by I/O mouth respectively;Data communication unit 13 electrically connects with 485 interfaces 14.485 interfaces 14 are 485 communication interfaces.
Described voltage conversion unit 1, is made up of boost configuration circuit, and work the high voltage being power supply 220V input voltage is increased to 10KV by a certain percentage.Due to high-voltage board, to be dielectrically separated from the resistance of resistance generally the biggest, general up to tens of megaohms, the voltage being carried in resistance two ends is too small, its load current will be the least the most accordingly, it is not easy to detection, by voltage conversion unit, input voltage is risen to high voltage be carried in and be dielectrically separated from resistance, an available current signal that can detect.
Described high-voltage board Insulation test part 2, i.e. to be measured on high-voltage board are dielectrically separated from resistance
The resistance being dielectrically separated from resistance is very big, typically no less than 10 megaohms, and to 10 kilovolts of high-voltage boards, its minimum insulation resistance, primary circuit should be less than 10 M Ω, and secondary circuit is not less than 2 M Ω.
Described voltage sampling unit 3, it is made up of ac voltage signal harvester, voltage signal more than KV level is raised according to a certain percentage by low supply voltage, if voltage signal more than KV level to be measured has only to measure the value of low supply voltage, then being multiplied by certain proportion and can be obtained by the value of KV level voltage signal, the effect of ac voltage signal harvester gathers the value of low supply voltage signal exactly and is transported to subsequent cell and processes.
Described current sampling unit 4 is made up of the current transformer of 0 ~ 100A, a resistance R is accessed between two pins of current transformer, by one end ground connection of resistance R, another terminates voltage signal detecting system, measured terminal voltage V of resistance R by voltage signal detecting system, then just can draw, divided by the resistance of resistance R, the current signal size that current transformer is measured by terminal voltage V measured.
Described DC voltage conversion unit 5 is made up of RMS conversion device, and its effect is that the ac voltage signal that aforesaid voltage detector unit detects is converted into the d. c. voltage signal required for subsequent voltage processing system.
Described DC current converter unit 6 is made up of RMS conversion device and precision resister, and its effect is that the ac current signal that aforementioned currents detector unit detects is converted into the DC current signal required for subsequent voltage processing system.
Described 2 path analoging switch 7, use dual power supply, wherein forward supply voltage is+9V, negative sense supply voltage is-5V, analog switch 2 pin output pin with DC voltage conversion unit 5 and DC current converter unit 6 respectively is connected, the pin that controls of analog switch is connected with an I/O interface of central processor unit 5, during 2 path analoging switch work, sent switching value by an I/O interface of central processor unit 5, determined the on/off of analoging switch output end mouth by the structural circuit within analog switch.
Described A/D converter 8 uses 24 A/D conversion chip ADS1110 of AD company, is characterized in that conversion accuracy is high, and up to 24, operating power consumption is low, and circuit design is simple.The input pin of analog signal conversion unit 4 is connected with the output pin of RMS conversion unit 3, voltage signal to be measured enters analog signal conversion unit 4 after RMS conversion cell translation, and through entering analog signal conversion unit 4, voltage to be measured is converted to digital signal by analogue signal, process for central processor unit 5.The control signal of analog signal conversion unit is sent by central processor unit 5.
Described central processor unit 9, being single-chip microcomputer and minimum system thereof, Single Chip Microcomputer (SCM) system uses the STC15W408AS that STC Corporation produces, and the feature of this Single Chip Microcomputer (SCM) system is wide operating voltage, running voltage width up to 2.6V-5.5V, reliability is high, and encryption performance is strong.Single Chip Microcomputer (SCM) system and 8 path analoging switch unit, analog signal conversion unit, data display unit, data communication unit is connected, and controls the duty of unit module respectively.
Described Date Conversion Unit 10 is the data model that data model Single Chip Microcomputer (SCM) system sent is converted to required for data communication system, the data signal sent due to Single Chip Microcomputer (SCM) system is Transistor-Transistor Logic level, and the data signal required for data communication system is 232 level, therefore need at this to set up data conversion system, the data signal of Transistor-Transistor Logic level is converted to the data signal of 232 multilevel type.
Described filter unit 11, its effect is for Single Chip Microcomputer (SCM) system, the electric power system of data communication system is filtered processing, when being operated due to Single Chip Microcomputer (SCM) system and data communication system, its operating frequency is high, and the requirement to electric power system is also the highest, and once power-supply system clutter increases, easily cause the interference to the two system, affect it and normally work.Therefore this utility model is designed with special filtering system, solves, with this, the problem that electric power system noise jamming is big.
Described data display unit 12 is made up of 48 Digital sum pipes and driving chip, and driving chip model is MAX7219.
Described data communication unit 13 uses RS485 communications protocol to carry out communication, and single-chip microcomputer sends communication data and is sent to data communication link through 485 driving chip after Date Conversion Unit carries out level.
The work process of this device is: is added on the test block of tested high-voltage board by the high-voltage signal (high-voltage power supply) raised, voltage x current sampler detects weak current and voltage respectively.Under Single-chip Controlling, by 2 path analoging switch timesharing input current voltage signals, Single Chip Microcomputer (SCM) system is sent into by after 24 high-precision AD converter conversion, (its measurement scope is 100 kilo-ohms-100 megaohms to be calculated the insulation resistance of high-voltage board measured piece through single-chip microcomputer, precision is up to one thousandth), and high in the clouds can be sent to by 485 interfaces and carry out big data summarization and process.
Parts that the present embodiment describes the most in detail and structure belong to the well-known components of the industry and common structure or conventional means, describe the most one by one.

Claims (10)

1. a high-voltage board insulation resistance detection device, is characterized in that: at least include: voltage conversion unit, high-voltage board Insulation test part, voltage sampling unit, current sampling unit, DC voltage conversion unit, DC current converter unit, 2 path analoging switch, A/D converter, central processor unit, Date Conversion Unit, filter unit, data display unit, data communication unit, 485 interfaces;Two outfans of voltage conversion unit electrically connect with two inputs of high-voltage board isolation resistance respectively;Two inputs of voltage conversion unit electrically connect with two inputs of voltage sampling unit respectively;The outfan of voltage sampling unit is connected with DC voltage conversion unit;The outfan of current sampling unit electrically connects with the input of DC current converter unit;The input electrical connection of DC voltage conversion unit and the outfan of DC current converter unit and 2 path analoging switch;The outfan of 2 path analoging switch electrically connects with the input of analog signal conversion unit;The outfan of analog signal conversion unit electrically connects with the I/O mouth of central processor unit;The control end controlling mouth and 2 path analoging switch, analog signal conversion unit of central processor unit electrically connects;Central processor unit is electrically connected with data display unit, data communication unit by I/O mouth respectively;Data communication unit and the electrical connection of 485 interfaces.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, is characterized in that: described voltage conversion unit is made up of boost configuration circuit, work the high voltage being power supply 220V input voltage is increased to 10KV by a certain percentage.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, is characterized in that: described high-voltage board isolation resistance, is i.e. dielectrically separated from resistance on high-voltage board.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, it is characterized in that: described voltage sampling unit is made up of ac voltage signal harvester, the effect of ac voltage signal harvester gathers the value of low supply voltage signal exactly and is transported to subsequent cell and processes.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, it is characterized in that: described current sampling unit is made up of the current transformer of 0 ~ 100A, a resistance R is accessed between two pins of current transformer, by one end ground connection of resistance R, another terminates voltage signal detecting system, measured terminal voltage V of resistance R by voltage signal detecting system, then just can draw, divided by the resistance of resistance R, the current signal size that current transformer is measured by terminal voltage V measured.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, it is characterized in that: described DC voltage conversion unit is made up of RMS conversion device, its effect is that the ac voltage signal that aforesaid voltage detector unit detects is converted into the d. c. voltage signal required for subsequent voltage processing system.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, it is characterized in that: described DC current converter unit is made up of RMS conversion device and precision resister, its effect is that the ac current signal that aforementioned currents detector unit detects is converted into the DC current signal required for subsequent voltage processing system.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, is characterized in that: described 2 path analoging switch use dual power supply, and wherein forward supply voltage is+9V, and negative sense supply voltage is-5V.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, is characterized in that: described A/D converter uses 24 A/D conversion chip ADS1110 of AD company.
A kind of high-voltage board insulation resistance detection device the most according to claim 1, is characterized in that: described central processor unit is single-chip microcomputer and minimum system thereof, Single Chip Microcomputer (SCM) system uses the STC15W408AS that STC Corporation produces;Described data display unit is made up of 48 Digital sum pipes and driving chip, and driving chip model is MAX7219;Described data communication unit uses RS485 communications protocol to carry out communication.
CN201620245394.1U 2016-03-28 2016-03-28 High -voltage board insulation resistance detection device Active CN205484566U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110726909A (en) * 2019-11-03 2020-01-24 西南交通大学 Method for monitoring and judging moisture degree of power distribution network cable intermediate joint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110726909A (en) * 2019-11-03 2020-01-24 西南交通大学 Method for monitoring and judging moisture degree of power distribution network cable intermediate joint

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