CN203837746U - An on-line insulation and temperature monitoring system used for a 12KV solid insulation switch cabinet - Google Patents
An on-line insulation and temperature monitoring system used for a 12KV solid insulation switch cabinet Download PDFInfo
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- CN203837746U CN203837746U CN201420120139.5U CN201420120139U CN203837746U CN 203837746 U CN203837746 U CN 203837746U CN 201420120139 U CN201420120139 U CN 201420120139U CN 203837746 U CN203837746 U CN 203837746U
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- switch cabinet
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Abstract
The utility model relates to an on-line insulation and temperature monitoring system used for a 12KV solid insulation switch cabinet. The on-line insulation and temperature monitoring system used for the 12KV solid insulation switch cabinet comprises an intelligent controller, a leakage current detection apparatus, an infrared temperature-detecting apparatus and an environment humiture detection apparatus. The leakage current detection apparatus comprises a drainage ring and a signal processor. The drainage ring is arranged between a switch cabinet insulation pull bar and the signal processor. The rear end of the signal processor is connected to the intelligent controller. The infrared temperature-detecting apparatus comprises an infrared temperature sensor and a conditioning circuit, and is installed on the front end of a busbar. A convex lens is arranged between the infrared temperature-detecting apparatus and the busbar. The environment humidity detection apparatus comprises an SHTxx digital humiture sensor. After the adoption of the technical scheme of the utility model, real time detection of performance of each item of the switch cabinet can be carried out; detection of the parameters can be carried out without power-off; safety performance of the switch cabinet can be guaranteed; and probability of occurrences of accidents can be reduced.
Description
technical field
The utility model relates to a kind of online insulation and temperature monitoring system for 12kV solid insulation switch cabinet, belongs to power equipment control monitoring system technical field.
Background technology
Insulating property and busbar temperature are two important parameters of power equipment in operational process, switch cubicle is in long-play, be subject to the impact of the factors such as environment, the insulating property of equipment self and electric conductivity can decline thereupon, if maintenance, can cause very large infringement to equipment and network system not in time.
12kV solid insulation ring main unit is because be 12kV hyperbaric environment, when insulating property detection method is interruption maintenance, equipment is carried out to power frequency withstand test, cannot in the process of equipment operation, to the insulating property of equipment, carry out Real-Time Monitoring, can not accomplish early to find early to administer, often etc. could find has appearred in accident, and the detection of busbar temperature is also because the reasons such as 12kV high pressure can not Real-Time Monitoring.
Utility model content
The purpose of this utility model be solve 12kV solid insulation ring main unit can not on-line real time monitoring Electric Power Equipment Insulation performance and the problem of busbar temperature, reduce the probability that equipment and system damages, improve power supply reliability.
The technical solution adopted in the utility model is: the utility model comprises intelligent controller, leakage current pick-up unit, infrared temperature detection device, ambient temperature and humidity pick-up unit;
Described leakage current pick-up unit: comprise draining ring, signal processor, described draining ring is arranged between switch cubicle insulated tension pole and signal processor, signal processor rear end connects intelligent controller;
Described infrared temperature detection device: comprise infrared temperature sensor MLX90614 and modulate circuit, be arranged on the front end of busbar, be provided with convex lens between described infrared temperature detection device and busbar;
Described ambient humidity pick-up unit: comprise SHTxx digital hygro sensor, the temperature humidity data that obtain are carried out to data processing by I2C bus transfer to conditioning single-chip microcomputer, through serial communication, the data after processing are sent to the preservation that host computer is realized temperature humidity data, analyzing and processing again;
The data that described Leakage Current pick-up unit, infrared temperature detection device, ambient temperature and humidity pick-up unit detect all transfer to intelligent controller and process.
The leakage current extension line of described switch cubicle insulated tension pole is selected single core coaxial screening electrical wires, and the direct-connected draining ring of shielded cable center line is also fixing.
The high electronegative potential of current transformer isolating switch cabinet is set.
Described signal processor comprises current/voltage converter, signal amplifier, traffic filter and multi-way switch.
Described infrared temperature detection device consists of MLX90614 sensor, high pressure ceramic disc capacitor and Transient Suppression Diode, and 3 mouthfuls of input+5V voltages of sensor are its power supply; In the situation that using SMbus output mode, use respectively digital signal and the serial clock signal of 2 mouthfuls and 3 mouthfuls output transducers of sensor; 2,3 mouthfuls connect pull-up resistor, and 4 mouthfuls of sensor for ground connection.
The utility model has the advantages that: adopt after the technical solution of the utility model, can detect in real time the properties of switch cubicle, without having a power failure, can carry out the detection of parameters, guaranteed the security performance of switch cubicle, reduced the probability that accident occurs.
Accompanying drawing explanation
Fig. 1 is the utility model leakage current signal conditioning plate circuit structure diagram.
Fig. 2 is the utility model arrangement of temperature sensor schematic diagram.
Fig. 3 is the utility model temperature sensor circuit schematic diagram.
Fig. 4 is the utility model ADuM1250 periphery circuit design figure.
Fig. 5 is the utility model intake observation circuit schematic diagram.
Fig. 6 is the utility model system chart.
In figure, 1 is that lens, 2 are that thermoelectric pile, 3 is that housing, 4 is that busbar, 5 is modulate circuit.
Specific implementation:
Insulation sensor detects Electric Power Equipment Insulation part insulation Leakage Current, by insulation function board, send controller to, controller by receive Leakage Current information convert to can identifying information output display to the LCDs of controller or output to host computer by 485 buses.
Infrared temperature sensor monitors busbar monitoring point temperature, by temperature function plate, will collect temperature signal and be sent to controller, controller by receive Leakage Current information convert to can identifying information output display to the LCDs of controller or output to host computer by 485 buses.
Temperature Humidity Sensor will monitor ambient temperature and humidity, by temperature function plate, will collect temperature signal and be sent to controller, controller by receive Leakage Current information convert to can identifying information output display to the LCDs of controller or output to host computer by 485 buses.
Switching value information exchange is crossed IO feature board, send the switching value information that monitors power equipment to controller, controller by receive Leakage Current information convert to can identifying information output display to the LCDs of controller or output to host computer by 485 buses.
Controller, except the above humiture information monitoring and intake information being shown to slave computer liquid crystal display or data is sent to host computer by 485 buses, can also be processed and analyze data, can send alarm signal by IO feature board.
Below the utility model is described further:
One,
insulation Leakage Current at line drawing
12kV solid insulation switch cabinet insulating property are mainly switch cubicle A, B, C three phase isolated pull bar insulation status over the ground.The sign of insulation characterisitic can realize by a lot of parameters, as shelf depreciation, dielectric loss angle tangent, leakage current etc.With the comparison of first two method, considering that on the basis of cost and performance, the definite insulation characterisitic monitoring target of the utility model is the Leakage Current of switchgear three phase isolated pull bar, method is simple easily to be carried out, more applicable.For this reason, need 3 groups of sensors of exploitation to carry out insulation state monitoring.
1. the extracting method of insulated leakage current
The extraction of leakage current adopts contact draining ring structure, adopt the painting of high-performance import conducting resinl to make draining ring 3 and collect leakage current, the principal ingredient of conducting resinl is epoxy resin and silver powder, the wide 10mm of draining ring 3, thick 1.5mm, the extension line of leakage current selects single core coaxial shielded cable to draw, and shielded cable center line directly connects draining ring 3, and fixing by boring between conducting resinl and sleeve pipe.The outlet method of this uniqueness avoids producing shelf depreciation, has also hindered entering of space charge.
Because draining ring 3 is mounted in the hot end of switch cubicle, in order to guarantee reliability and the security of whole monitoring system, adopt current transformer to realize effective isolation of the high electronegative potential of switch cubicle, current transformer adopts core-theaded type design, and no-load voltage ratio is 1:10.The electromagnetic coupled principle of mutual inductor had both guaranteed the normal operation of high-tension apparatus; be not subject to the impact of secondary winding in current transformer external circuit; also the damage that can avoid monitoring device primary side high voltage to cause secondary circuit, has played the effect of Protection secondary circuit.
Generally, the insulated leakage current of switch cubicle only has several microamperes of sizes, it is a kind of very faint signal, little current signal like this, must carry out the processing such as necessary amplification, filtering through signal pre-processing circuit, the key issue of therefore accurately monitoring is that amplification and the electromagnetism of little current signal is anti-interference.The function of leakage current signal conditioning plate circuit comprises current/voltage conversion, instrument amplifier amplification, low-pass filtering and multi channel selecting.
two, busbar temperature rising state at line drawing
It is all more difficult that the scene of 12kV solid insulation ring main unit busbar temperature signal is extracted, because point for measuring temperature is often in noble potential, continue to use the powerup issue that common contact temperature-measuring method is difficult to solve sensor, and easily cause high-pressure section to puncture over the ground along sensor signal transmission path, cause serious fault, therefore in this project, adopting the non-contact temperature sensor based on heat radiation principle is that infrared temperature sensor is measured the temperature at this place by catching the infrared signal of busbar electrical connection place radiation.
According to above-mentioned various reasons, the new digital infrared temperature sensor MLX90614 that project selects Melexis company to produce, owing to being that sensor too much mimic channel has around been avoided in digital signal output, has reduced cost of development thereby strengthened anti-interference.
1. the extracting method of busbar temperature rise signal
Infrared temperature sensor comprises lens 1, thermoelectric pile 2, housing 3 and modulate circuit 5, is arranged on the position (D must be greater than insulating safety distances) apart from busbar 4D, in low potential side, can conveniently power and signal transmission.Infrared temperature sensor generally has larger sensing angle, makes that measurement range is excessive affects accuracy.Therefore, this project adopts lens 1 to focus on, and making dispersion angle is α=10 degree, if mounting distance D chooses 18cm, measures radius and is about 3cm, is less than busbar 4 half width R.By special modulation, mounting distance D changes measurement result impact less, as long as measurement range does not exceed busbar 4 radiuses, can guarantee that accuracy of measurement is not higher than 3 degree.Measurement data is transferred to intelligent electronic device by I2C bus form, is convenient to processing and antijamming capability strong.
Sensor circuit is mainly used to detect and export digital temperature signal, mainly MLX90614 sensor, high pressure ceramic disc capacitor and Transient Suppression Diode (TVS pipe), consists of.3 mouthfuls of input+5V voltages of sensor are its power supply; In the situation that using SMbus output mode, use respectively digital signal and the serial clock signal of 2 mouthfuls and 3 mouthfuls output transducers of sensor, because of sensor driving force limited, for increasing the stability of circuit, improve its driving force, we are necessary for 2,3 mouthfuls and connect pull-up resistor, and its size is specifically determined by transmission range; 4 mouthfuls of sensor for ground connection.
2. the modulate circuit of busbar temperature rise signal
Signal conditioning circuit and CPU (central processing unit) on signal regulating panel, have been comprised, Main Function is accept data that data acquisition board transmits and it is nursed one's health, sends into CPU (central processing unit) after Isolation, by STC12C5A60S2 single-chip microcomputer, data are processed and the operation such as compensation, and the communicating by letter of realization and master control borad single-chip microcomputer.
In back-end circuit, digital temperature signal, by double layer screen cable transmission, by cable shield two-terminal-grounding, can have stronger antijamming capability in application.At the high frequency interference filtering signal of the glitch protection by TVS pipe and high pressure ceramic disc capacitor, entering into bidirectional bus isolator ADuM1250 isolating device isolates; the effect of isolation is to cut off and external circuit (signal wire, power lead) earthy connection, to suppress common mode interference.
ADuM1250 be a can realize two-way signaling isolation without the magnetic isolator latching, support hot plug, be specifically applied to the I2C of isolation cost sensitivity, the bidirectional communications bus such as SMBUS and PMBUS.Having eliminated light-coupled isolation need be divided into the unnecessary trouble that independent reception or transmitted signal are brought two-way signaling, makes the circuit board reduce large quantity space.Meanwhile, because the photoelectricity transmission link that affects efficiency in photoelectrical coupler has been cancelled in isolation in design, so its power consumption is only 1/16-1/10 of photoelectrical coupler.Adopt the bidirectional communications bus buffer circuit of ADuM1250 very simple, two-way buffer circuit than optocoupler, it is little that ADuM1250 has volume, low in energy consumption, and peripheral circuit is extremely simple and have advantages such as higher message transmission rate, time sequence precision and transient state common mode inhibition capacity.
three, ambient temperature and humidity state at line drawing
1. Temperature Humidity Sensor chooses
The SHTxx series digit Temperature Humidity Sensor that this project adopts Switzerland Sensirion to release, the cmos digital sensing technology based on the leading world, has high reliability and remarkable long-time stability.Probe power is 5V power supply, and gamut is demarcated, and two-line digital interface, can directly be connected with single-chip microcomputer, greatly shortens research and development time, peripheral circuits and reduces expense.In addition, volume is small, response is rapid (<4s), low energy consumption (<1 μ W), can submergence, strong, the warm and humid one of antijamming capability, have dew point measurement concurrently, cost performance is high, makes this product can be suitable for the application of multiple occasion.
2. the measuring principle of Temperature Humidity Sensor
Native system is directly controlled SHT11 by temperature rise signal conditioning plate, the temperature humidity data that obtain are carried out to data processing by I2C bus transfer to conditioning single-chip microcomputer, through serial communication, the data after processing are sent to the preservation that host computer is realized temperature humidity data, analyzing and processing again.Single-chip microcomputer and SHT11 part of data acquisition, both adopt I2C interface.
four, switching value at line drawing
The switching value input state of monitoring mainly contains grounding switch deciliter position, isolating switch deciliter position, wheelbarrow position and disconnector position.The on-line monitoring of switching value is the state that divide/closes of switch in reactive switches cabinet fast and accurately, for technician provides the signal designation of on off state, make technician not reason switch misoperation and produce unnecessary accident,
The extraction of switching value realizes by drawing mechanical contacts, by the power supply of switching input module, power to different contacts, and the electric signal by single-chip microcomputer switching value input port collection machinery contact judge each switch close/cut-off state, intake observation circuit principle as shown in the figure, DI IN04 end is connected with the mechanical contacts to be measured of drawing, all adopt+24V of intake Power supply, when grounding switch is closed, be that mechanical contacts to be measured is closed, the level signal that DI IN04 pin is 24V, DI04 leg signal through photoelectrical coupler coupling output is high level, then send into the folding condition of microprocessor processes judgement mechanical contacts, and be presented on liquid crystal administration interface.
The breaking-closing operating of carrying out as required of drawing of the amount of outputing is exported corresponding high electronegative potential, triggers pilot relay action after light-coupled isolation, realizes the control operation to peripheral circuit.Control (nodal information is provided) and the divide-shut brake relay (action of control operation loop) that according to the difference of relay driving force, can be divided into signal relay.Relay is selected the DSP2a-DC24V of PANASONIC.This relay has two normally opened contacts, and volume is little, and capacity is high, highly sensitive, coil voltage direct current 24V, the maximum break-make capacity 750VA (5A 250V AC) during 2a type.
Claims (5)
1. for online insulation and the temperature monitoring system of 12kV solid insulation switch cabinet, it is characterized in that, comprise intelligent controller, leakage current pick-up unit, infrared temperature detection device, ambient temperature and humidity pick-up unit;
Described leakage current pick-up unit: comprise draining ring, signal processor, described draining ring is arranged between switch cubicle insulated tension pole and signal processor, signal processor rear end connects intelligent controller;
Described infrared temperature detection device: comprise infrared temperature sensor MLX90614 and modulate circuit, be arranged on the front end of busbar, be provided with convex lens between described infrared temperature detection device and busbar;
Described ambient humidity pick-up unit: comprise SHTxx digital hygro sensor, the temperature humidity data that obtain are carried out to data processing by I2C bus transfer to conditioning single-chip microcomputer, through serial communication, the data after processing are sent to the preservation that host computer is realized temperature humidity data, analyzing and processing again;
The data that described Leakage Current pick-up unit, infrared temperature detection device, ambient temperature and humidity pick-up unit detect all transfer to intelligent controller and process.
2. a kind of online insulation and temperature monitoring system for 12kV solid insulation switch cabinet according to claim 1, it is characterized in that, the leakage current extension line of described switch cubicle insulated tension pole is selected single core coaxial screening electrical wires, and the direct-connected draining ring of shielded cable center line is also fixing.
3. a kind of online insulation and temperature monitoring system for 12kV solid insulation switch cabinet according to claim 1, is characterized in that, the high electronegative potential of current transformer isolating switch cabinet is set.
4. a kind of online insulation and temperature monitoring system for 12kV solid insulation switch cabinet according to claim 1, is characterized in that, described signal processor comprises current/voltage converter, signal amplifier, traffic filter and multi-way switch.
5. a kind of online insulation and temperature monitoring system for 12kV solid insulation switch cabinet according to claim 1, it is characterized in that, described infrared temperature detection device consists of MLX90614 sensor, high pressure ceramic disc capacitor and Transient Suppression Diode, and 3 mouthfuls of input+5V voltages of sensor are its power supply; In the situation that using SMbus output mode, use respectively digital signal and the serial clock signal of 2 mouthfuls and 3 mouthfuls output transducers of sensor; 2,3 mouthfuls connect pull-up resistor, and 4 mouthfuls of sensor for ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420120139.5U CN203837746U (en) | 2014-03-18 | 2014-03-18 | An on-line insulation and temperature monitoring system used for a 12KV solid insulation switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410098420.8A CN103900636B (en) | 2014-03-18 | 2014-03-18 | Online insulation and temperature monitoring system used for 12kV solid insulated switch cabinet |
| CN201420120139.5U CN203837746U (en) | 2014-03-18 | 2014-03-18 | An on-line insulation and temperature monitoring system used for a 12KV solid insulation switch cabinet |
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| CN203837746U true CN203837746U (en) | 2014-09-17 |
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| CN201420120139.5U Expired - Fee Related CN203837746U (en) | 2014-03-18 | 2014-03-18 | An on-line insulation and temperature monitoring system used for a 12KV solid insulation switch cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900636A (en) * | 2014-03-18 | 2014-07-02 | 扬州科宇电力有限公司 | Online insulation and temperature monitoring system used for 12kV solid insulated switch cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900636A (en) * | 2014-03-18 | 2014-07-02 | 扬州科宇电力有限公司 | Online insulation and temperature monitoring system used for 12kV solid insulated switch cabinet |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20160318 |