CN107843813A - A kind of insulation detection device based on LoRa - Google Patents
A kind of insulation detection device based on LoRa Download PDFInfo
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- CN107843813A CN107843813A CN201710896449.4A CN201710896449A CN107843813A CN 107843813 A CN107843813 A CN 107843813A CN 201710896449 A CN201710896449 A CN 201710896449A CN 107843813 A CN107843813 A CN 107843813A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention discloses a kind of insulation detection device based on LoRa,Including Insulation monitoring sensor,Insulation monitoring sensor is connected with LoRa gateways,LoRa gateways are connected with server,Server is connected with mobile terminal and PC terminals,Insulation monitoring sensor includes single-chip microcomputer,A/D converting units,CAN communication unit,Multipath conversion unit,Sensor self-test unit,Output driving unit,First power module and LoRa communication modules,A/D converting units,CAN communication unit and LoRa communication modules interconnect with single-chip microcomputer,Multipath conversion unit,Sensor self-test unit,Output driving unit and the first power module are unidirectionally connected with single-chip microcomputer,A/D converting units are unidirectionally to be connected with multipath conversion unit,Wherein multipath conversion unit is unidirectionally connected with positive pole line-to-earth voltage detection unit,Negative busbar voltage-to-ground detection unit and multiple branch road leakage current detection units；The present invention have can fault location, reaction sensitivity be high, measurement precisely, intelligent data transmission the advantages of.
Description
Technical field
The invention belongs to technical field of insulation detection, and in particular to a kind of insulation detection device based on LoRa.
Background technology
The straight-flow system of power plant and transformer station is control and signal system, the relay protection and work of automatics electricity
Source.The quality of its operation conditions is directly connected to power plant and can transformer station normal operation.Grounding be straight-flow system most
Common insulation breakdown failure, if can not in time find and exclude earth point, when multipoint earthing occurs in system, direct current will be caused
Power supply short circuit or protection equipment malfunction, lead to grave consequences.At present, the Insulation monitoring of straight-flow system mainly has with earthing wire-selecting
Three kinds of methods：Bridge method；Injecting signal；DC leakage current detection method.The shortcomings that three of the above method, is clearly.Use electricity
During bridge method monitoring grounding failure, the integral insulation state of straight-flow system can only be judged, it is impossible to realize malfunction branch location.Use change
During frequency probe method monitoring grounding failure, it can not only increase the ripple coefficient of voltage of system, influence power supply quality, and by system
Distribution capacity influences.During using DC leakage current detection method, because leakage current is typically small, it is difficult to measure, seriously limit event
Hinder the accuracy and sensitivity of detection.In addition, existing insulation detection device can not carry out detection for a long time and remote number at present
It is believed that the transmission of breath, is detected when carrying out Insulation monitoring, it is necessary to carry detection device to electric field and substation field, and
Mechanical detection is carried out by manual operation, the mode of this live manual operation detection is easy to that security incident occurs, and
And enhance the working strength of power system attendant.
The content of the invention
The purpose of the present invention be overcome the deficiencies in the prior art and provide a kind of reaction is fast, monitoring precisely, information transfer away from
From the insulation detection device remote, easy to use based on LoRa.
Technical scheme is as follows：
A kind of insulation detection device based on LoRa, including Insulation monitoring sensor, the Insulation monitoring sensor are connected with
LoRa gateways, the LoRa gateways are connected with server, and the server is connected with mobile terminal and PC terminals, the insulation
Detection sensor include single-chip microcomputer, A/D converting units, CAN communication unit, multipath conversion unit, sensor self-test unit,
Output driving unit, the first power module and LoRa communication modules, the A/D converting units, CAN communication unit and
LoRa communication modules interconnect with single-chip microcomputer, the multipath conversion unit, sensor self-test unit, output driving unit and the
One power module is unidirectionally connected with single-chip microcomputer, and A/D converting units are unidirectionally to be connected with multipath conversion unit, wherein multipath conversion
Unit is unidirectionally connected with positive pole line-to-earth voltage detection unit, negative busbar voltage-to-ground detection unit and multiple branch roads electric leakage electricity
Detection unit is flowed, the output driving unit is unidirectionally connected with positive bus-bar switching detection resistance unit, branch road insulation against ground resistance
Unit and negative busbar switching detection resistance unit.
The LoRa gateways include microprocessor, and the microprocessor is connected with LoRa RF receiving and transmission modules, RS485 strings
Mouth, external memory storage and second source module.
The Insulation monitoring sensor is communicated by LoRa to be connected with LoRa gateways.
The LoRa gateways concatenate bus by RS485 and are connected with server.
The server is connected by wireless network with mobile terminal, and server is connected by fiber optic network with PC terminals.
The branch road leakage current detection unit is current sensor, the positive pole line-to-earth voltage detection unit and negative
Bus Voltage detection unit is voltage sensor.
The output driving unit is arithmetic element, and its calculation formula applied has,
(formula 1)
（Formula 2）
（Formula 3）
In formula 1 and formula 2,For positive bus-bar resistance to earth value,For negative busbar resistance to earth value,For detection resistance（For definite value）,The voltage between positive and negative busbar,For positive electrode bus voltage-to-ground,For negative electrode bus voltage-to-ground,It is exhausted over the ground for branch road
Edge resistance value；
In formula 3,,, whereinFor detection resistanceCurrent sensor is examined when putting into negative electrode bus
The leakage current value measured,For detection resistanceThe leakage current value that current sensor detects when putting into positive electrode bus.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention uses the LoRa communication technologys, realizes the long-distance transmissions of Insulation monitoring Sensor monitoring data, only need to be whole
One LoRa gateway is installed, it is possible to realize to the Insulation monitoring of whole power plant or transformer station in individual power plant or transformer station
Monitoring Data is received and dispatched；
2nd, the leakage current value for the branch road that the present invention is detected to current sensor and voltage sensor using dynamic differential technique and just
Negative busbar carries out computing to low voltage value and obtains out branch insulation against ground resistance value, so as to effectively monitor branch road insulation against ground resistance value
Situation of change, and fast positioning is out of order branch road；
3rd, the present invention realizes connection between server and mobile terminal by wireless network, can cause in shop attendant and
When obtain the data value of insulation detection device detection, system has very high sensitivity；
In a word, the present invention have can fault location, reaction sensitivity be high, measurement precisely, intelligent data transmission the advantages of.
Brief description of the drawings
Fig. 1 is the mechanism block diagram of insulation detection device in the present invention.
Fig. 2 is system block diagram in the present invention.
Fig. 3 is LoRa gateway architecture block diagrams in the present invention.
Fig. 4 is to put into monitoring resistor schematic diagram to dc bus in the embodiment of the present invention.
Fig. 5 is insulation detection device overhaul flow chart in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As Figure 1-3, a kind of insulation detection device based on LoRa, including Insulation monitoring sensor, the insulation inspection
Survey sensor and be connected with LoRa gateways, the LoRa gateways are connected with server, the server be connected with mobile terminal and
PC terminals, the Insulation monitoring sensor include single-chip microcomputer, A/D converting units, CAN communication unit, multipath conversion unit,
Sensor self-test unit, output driving unit, the first power module and LoRa communication modules, the A/D converting units, CAN
Bus communication unit and LoRa communication modules interconnect with single-chip microcomputer, the multipath conversion unit, sensor self-test unit, defeated
Go out driver element and the first power module is unidirectionally connected with single-chip microcomputer, A/D converting units and multipath conversion unit are unidirectional
Connection, wherein multipath conversion unit is unidirectionally connected with positive pole line-to-earth voltage detection unit, negative busbar voltage-to-ground detection unit
And multiple branch road leakage current detection units, the output driving unit are unidirectionally connected with positive bus-bar switching detection resistance list
Member, branch road insulation against ground resistance unit and negative busbar switching detection resistance unit.
In the present embodiment, the LoRa gateways include microprocessor, and the microprocessor is connected with LoRa radio-frequency receiving-transmitting moulds
Block, RS485 serial ports, external memory storage and second source module；The Insulation monitoring sensor is communicated by LoRa and LoRa
Gateway is connected；The LoRa gateways concatenate bus by RS485 and are connected with server；The server is by wireless network with moving
Dynamic terminal is connected, and server is connected by fiber optic network with PC terminals；The branch road leakage current detection unit is current sense
Device, positive pole line-to-earth voltage detection unit and negative busbar the voltage-to-ground detection unit is voltage sensor；It is described defeated
It is arithmetic element to go out driver element, and its calculation formula applied has,(formula 1),
（Formula 2）（Formula 3）；In formula 1 and formula 2,For positive bus-bar resistance to earth value,For negative busbar resistance to earth value,For detection
Resistance（For definite value）,The voltage between positive and negative busbar,For positive electrode bus voltage-to-ground,For negative electrode bus voltage-to-ground,
For branch road insulation against ground resistance value；In formula 3,,, whereinFor detection resistancePut into positive electrode bus
When the leakage current value that detects of current sensor,For detection resistanceThe electric leakage that current sensor detects when putting into negative electrode bus
Flow valuve.
The Cleaning Principle of the present invention, as shown in figure 4, by taking branch road 1 as an example, works as K1Closure, K2During disconnection, detection resistance R inputs
Positive bus-bar, the voltage sensor of insulation detection device measure positive pole line-to-earth voltage U1, current sensor measures the inflow of branch road 1
Electric current I+Value；Work as K1Disconnect, K2During closure, detection resistance R input negative busbars, the voltage sensor of insulation detection device measures just
Bus Voltage U2, current sensor measures the inflow current I of branch road 1-Value, insulation detection device connect according to single-chip microcomputer
The calculation formula of output driving unit calculates、And。
As shown in figure 5, the testing process of the insulation detection device of the invention based on LoRa is as follows, insulation detection device uses
Preceding carry out initializing set, sets respectively、AndMinimum guard value, then bring into operation insulation detection device, insulation
Detection means is according to the operation program of initializing set, K1Closure, K2Disconnect, the voltage sensor of insulation detection device measures just
Bus Voltage U1, current sensor measures the inflow current I of branch road 1+Value；K1Disconnect, K2Closure, insulation detection device
Voltage sensor measures positive pole line-to-earth voltage U2, current sensor measures the inflow current I of branch road 1-Value, insulation detection device
The calculation formula of the output driving unit connected according to single-chip microcomputer calculates、And, the single-chip microcomputer in insulation detection device
Result of calculation and minimum guard value are contrasted, if result of calculation illustrates that branch road leaks electricity less than minimum guard value, insulation inspection
Device is surveyed to communicate to LoRa gateway feedback data information by LoRa, and data message is fed back to server by LoRa gateways, PC
Terminal obtains the data message on server, and PC terminals obtain abnormal data information and will warned；If result of calculation is more than
Or terminate equal to minimum guard value, detection, K1Disconnect, K2Disconnect, next detection is entered after insulation detection device timing 1h and is followed
Ring.
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art,
It can still modify to the technical scheme described in foregoing embodiments, or which part technical characteristic is carried out etc.
With replacing, within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., this should be included in
Within the protection domain of invention.
Claims (7)
1. a kind of insulation detection device based on LoRa, including Insulation monitoring sensor, the Insulation monitoring sensor is connected with
LoRa gateways, the LoRa gateways are connected with server, and the server is connected with mobile terminal and PC terminals, and its feature exists
In：The Insulation monitoring sensor includes single-chip microcomputer, A/D converting units, CAN communication unit, multipath conversion unit, sensing
Device self-test unit, output driving unit, the first power module and LoRa communication modules, the A/D converting units, CAN
Communication unit and LoRa communication modules are interconnected with single-chip microcomputer, and the multipath conversion unit, sensor self-test unit, output are driven
Moving cell and the first power module are unidirectionally connected with single-chip microcomputer, and A/D converting units are unidirectionally to be connected with multipath conversion unit,
Wherein multipath conversion unit is unidirectionally connected with positive pole line-to-earth voltage detection unit, negative busbar voltage-to-ground detection unit and more
Individual branch road leakage current detection unit, the output driving unit are unidirectionally connected with positive bus-bar switching detection resistance unit, branch road
Insulation against ground resistance unit and negative busbar switching detection resistance unit.
2. the insulation detection device based on LoRa as claimed in claim 1, it is characterised in that：The LoRa gateways include micro- place
Device is managed, the microprocessor is connected with LoRa RF receiving and transmission modules, RS485 serial ports, external memory storage and second source module.
3. the insulation detection device based on LoRa as claimed in claim 1 or 2, it is characterised in that：The Insulation monitoring sensing
Device is communicated by LoRa to be connected with LoRa gateways.
4. the insulation detection device based on LoRa as claimed in claim 1 or 2, it is characterised in that：The LoRa gateways pass through
RS485 concatenation buses are connected with server.
5. the insulation detection device based on LoRa as claimed in claim 1, it is characterised in that：The server passes through wireless network
Network is connected with mobile terminal, and server is connected by fiber optic network with PC terminals.
6. the insulation detection device based on LoRa as claimed in claim 1, it is characterised in that：The branch road leakage current detection
Unit is current sensor, and positive pole line-to-earth voltage detection unit and negative busbar the voltage-to-ground detection unit is voltage
Sensor.
7. the insulation detection device based on LoRa as claimed in claim 1, it is characterised in that：The output driving unit is fortune
Unit is calculated, its calculation formula applied has,
QUOTE (formula 1)
QUOTE （Formula 2）
QUOTE （Formula 3）
In formula 1 and formula 2, QUOTE For positive bus-bar resistance to earth value, QUOTE For negative busbar resistance to earth value,
QUOTE For detection resistance（For definite value）, QUOTE The voltage between positive and negative busbar, QUOTE It is female for positive pole
Line-to-earth voltage, QUOTE For negative electrode bus voltage-to-ground, QUOTE For branch road insulation against ground resistance value；
In formula 3, QUOTE , QUOTE , its
Middle QUOTE For detection resistance QUOTE The leakage current value that current sensor detects when putting into negative electrode bus,
QUOTE For detection resistance QUOTE The leakage current value that current sensor detects when putting into positive electrode bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896449.4A CN107843813A (en) | 2017-09-28 | 2017-09-28 | A kind of insulation detection device based on LoRa |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896449.4A CN107843813A (en) | 2017-09-28 | 2017-09-28 | A kind of insulation detection device based on LoRa |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830283A (en) * | 2011-06-13 | 2012-12-19 | 中兴通讯股份有限公司 | Insulating detection device and detection method for direct-current power supply |
| CN206332860U (en) * | 2017-01-04 | 2017-07-14 | 路晓明 | LoRa gateways |
| CN206470931U (en) * | 2016-12-29 | 2017-09-05 | 江西飞尚科技有限公司 | A kind of monitoring device based on LoRa technologies |
| CN206490683U (en) * | 2016-08-31 | 2017-09-12 | 上海宏力达信息技术股份有限公司 | A kind of gateway based on LoRa wireless technologys |
-
2017
- 2017-09-28 CN CN201710896449.4A patent/CN107843813A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830283A (en) * | 2011-06-13 | 2012-12-19 | 中兴通讯股份有限公司 | Insulating detection device and detection method for direct-current power supply |
| CN206490683U (en) * | 2016-08-31 | 2017-09-12 | 上海宏力达信息技术股份有限公司 | A kind of gateway based on LoRa wireless technologys |
| CN206470931U (en) * | 2016-12-29 | 2017-09-05 | 江西飞尚科技有限公司 | A kind of monitoring device based on LoRa technologies |
| CN206332860U (en) * | 2017-01-04 | 2017-07-14 | 路晓明 | LoRa gateways |
Non-Patent Citations (4)
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| 刘波文 等: "《ARM嵌入式项目开发三位一体实战精讲》", 31 October 2011 * |
| 卞永明 等: "《桥梁结构现代施工技术》", 30 June 2017 * |
| 周军 等: "基于动态差值法的直流系统绝缘监测技术", 《电工技术学报》 * |
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Application publication date: 20180327 |