CN206601465U - A kind of anti-instantaneous ac scurries into insulation monitoring and warning device - Google Patents
A kind of anti-instantaneous ac scurries into insulation monitoring and warning device Download PDFInfo
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- CN206601465U CN206601465U CN201720334120.4U CN201720334120U CN206601465U CN 206601465 U CN206601465 U CN 206601465U CN 201720334120 U CN201720334120 U CN 201720334120U CN 206601465 U CN206601465 U CN 206601465U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000009413 insulation Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims 1
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- 238000004458 analytical method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The utility model is related to the insulating monitoring to straight-flow system, and especially a kind of anti-instantaneous ac scurries into insulation monitoring and warning device.Including main frame, line selection apparatus, DC leakage flow sensor；The main frame includes cpu data processing module, data acquisition module, balance bridge, uneven bridge circuit module, power module, display module, alarm module and communication module；The cpu data processing module is connected with described data acquisition module；The data acquisition module includes multi pass acquisition electronic switch, operational amplifier and high-precision AD chip, in real time the collection positive and negative voltage-to-ground of dc bus, DC bus-bar voltage；The balance bridge, uneven bridge circuit module include one group of balance resistor bridge and detection resistor bridge；The display module and alarm module are connected with described cpu data processing module；Line selection apparatus is connected with cpu data processing module and DC leakage flow sensor.
Description
Technical field
The utility model is related to the insulating monitoring to straight-flow system, and especially a kind of anti-instantaneous ac scurries into insulating monitoring dress
Put.
Background technology
The safe and reliable operation of dc source is most important for the safe and reliable operation of transformer station.But due to dc source
Power supply unit is more, and power cable is long, often occurs the failures such as DC earthing in actual motion.Although straight-flow system is transported floatingly
OK, single-point grounding does not influence the normal operation of system, but must search failure as early as possible and eliminated, and otherwise occurs second point ground connection
When, relay or protection device misoperation are will result in, is led to grave consequences.At present, direct current system is commonly used in transformer station
System insulation and line selection apparatus, serve preferable effect.
In actual motion, there is a kind of special earth fault destructive bigger, here it is alternating current scurries into straight-flow system.
The insulation monitoring and warning device of most of producers does not still possess exchange and scurries into the survey note and warning function of failure, and possesses the function
The response time that monitoring device scurries into failure to exchange is universal longer.By scurrying into the theory that fault case deploys depth to exchange
Analysis, it is found that protection equipment malfunction is frequently experienced in exchange and scurried within the time very short after failure, can not prevent such event
In the case of barrier, how quickly identification exchange scurries into failure and records fault data provides data for the analysis of the accident origin cause of formation
Foundation, especially scurries into the survey note of failure to instantaneous ac.
Utility model content
To overcome the weak point of above-mentioned technology, the utility model scurries into insulating monitoring dress there is provided a kind of anti-instantaneous ac
Put, not only whether occur insulation reduction and route selection function with monitoring straight-flow system, and can monitor whether straight-flow system is sent out
The branch road that failure is scurried into raw exchange, positioning exchange is scurried into, the detection and alarm especially scurried into instantaneous ac.
The utility model takes following technical scheme to realize：
A kind of anti-instantaneous ac scurries into insulation monitoring and warning device, including main frame, line selection apparatus, DC leakage flow sensor；
The main frame includes cpu data processing module, data acquisition module, balance bridge, uneven bridge circuit module, power supply
Module, display module, alarm module and communication module；
The cpu data processing module is connected with described data acquisition module；
The data acquisition module includes multi pass acquisition electronic switch, operational amplifier and high-precision AD chip, adopts in real time
Collect the positive and negative voltage-to-ground of dc bus, DC bus-bar voltage；
The balance bridge, uneven bridge circuit module include one group of balance resistor bridge and detection resistor bridge；
The display module is connected with described cpu data processing module, for display straight-flow system voltage in real time and absolutely
Edge data, and send the parameter information that display module is set to cpu data processing module；
The alarm module is connected with the cpu data processing module, for outputting alarm signal；
Line selection apparatus is connected with cpu data processing module by described communication module, realizes data communication；
The line selection apparatus is connected with DC leakage flow sensor, while gathered data and to DC leakage flow sensor
Power supply, is mainly used in gathering the DC voltage value that DC leakage flow sensor is changed out, and position insulation reduction branch road and exchange
Scurry into branch road；
The leakage current of branch road is converted into DC voltage and is uploaded to line selection apparatus by described DC leakage flow sensor.
Described DC leakage current sensor card is connected to per on DC feeder all the way, and power supply is provided by line selection apparatus, and will
The leakage current that fault branch is produced is converted to DC voltage and is uploaded to line selection apparatus.
The cpu data processing module uses commercially available cpu central processing unit module.Using Texas Instrument（TI）Company gives birth to
The dsp chip of production（Digital signal processing chip）, with floating point calculating unit, FFT calculating can be efficiently completed.
The display module is shown using 7 cun of color touch LCDs to data, and can be by touching
LCDs is modified to device inner parameter, such as alarm parameter, function control parameter, the operational factor of device in itself
Deng.
Alarm module is alerted using relay, and relay alarm output node can bear 220V DC operations for a long time
Voltage.
Communication module uses three kinds of communication modes of RS232/RS485/ network interfaces, and three kinds of modes can be set by display module
Selected；Communications protocol mode is Modbus RTU modes.
The DC leakage flow sensor uses commercially available open type DC leakage flow sensor, is avoided in installation process
Branch road has a power failure, and improves working security.
The line selection apparatus uses commercially available Small Electric Current Earthing And Routing Device.
Operation principle of the present utility model：
Include cpu data processing module, data acquisition module, balance bridge, uneven bridge in main frame of the present utility model
Circuit module, power module, display module, alarm module and communication module；The side being combined by balance bridge and uneven bridge
Formula, when there is exchange to scurry into, data acquisition module will gather positive and negative voltage-to-ground value in real time and be uploaded to cpu data processing mould
Block, cpu data processing module carries out corresponding logic judgment and fast fourier transform algorithm, so as to show system whether there is exchange
The waveform scurried into and amplitude are scurried into and exchange, device carries out throwing and moves back detection bridge automatically, so that cause positive and negative voltage-to-ground to change,
Instantaneous ac is divided into according to duration for scurrying into of exchange scurried into and scurry into exchanging, if instantaneous ac is scurried into, the alarm of device
Module is by outputting alarm signal and records instantaneous ac and scurries into waveform；If exchange is scurried into, cpu data processing module will be carried out
The positioning and route selection of branch road are scurried into exchange.
The monitoring method of the utility model device, comprises the following steps：
1）Main frame detects the busbar voltage and positive and negative busbar voltage-to-ground of straight-flow system by data acquisition module in real time, and
Measured busbar voltage and positive and negative busbar voltage-to-ground are sent to cpu data processing module；
2）Cpu data processing module carries out corresponding logic judgment and fast fourier transform algorithm, so as to draw whether there is
The waveform scurried into and amplitude are scurried into and exchanged in exchange, and the duration scurried into according to exchange is divided into instantaneous ac and scurries into and exchange
Scurry into；If instantaneous ac is scurried into, recorded by display module and show that instantaneous ac scurries into waveform, pass through alarm module
Carry out outputting alarm signal；If exchange, which is scurried into, then enters step 3）；
3）Start balance bridge, uneven bridge circuit module, cpu data processing module carry out exchange scurry into branch road positioning and
Route selection, is intuitively shown selected fault branch and grounding resistance by display module, and passes through described alarm mould
Block carries out corresponding dry contact and audible and visual alarm.
Step 2）The detailed process of middle logic judgment and fast fourier transform algorithm is to pass through the FFT to gathered data
Calculate, obtain the AC compounent in straight-flow system in this 20ms times, if the AC compounent calculated exceedes the exchange of setting
Scurry into upper voltage limit value, then it is assumed that straight-flow system occurs exchange and scurries into failure, and can automatic start failure wave-recording mechanism, record
The voltage data of fault moment；The conversion points that the FFT is calculated are 64 points, using real arithmetic mode unfolding calculation.
The utility model has the advantage of：
（1）The device can be realized on the basis of former microcomputer type insulation monitoring and warning device and scurry into the fast of failure to exchange
Slowdown monitoring, alarm, recording and branch road route selection function, and instantaneous ac can be diagnosed scurry into failure, record fault moment shape information.
（2）Overall to DC power system and distribution insulation against ground situation monitoring analysis can be realized, can accurately be known
Not all types of earth faults, and the physical location occurred to failure is positioned, the malfunction elimination time is greatly shortened, safely may be used
The operation of the guarantee DC power system leaned on, the fault spread for effectively preventing DC system fault from causing.
Brief description of the drawings
Below with reference to accompanying drawing, the utility model is described in further detail：
Fig. 1 is the circuit diagram of the utility model insulation monitoring and warning device.
Fig. 2 is insulation resistance of DC system measurement and the alternating current voltage measuring circuit figure of the utility model main frame；
Fig. 3 is the decision logic flow chart of the utility model monitoring method.
In Fig. 3：KM+, KM- are respectively the positive and negative bus of straight-flow system, and Rx, Ry are respectively the straight-flow system for needing to detect
Insulaion resistance；C1, C2 are electric capacity；R1, R2 are sampling resistor；R3, R4 are sampling resistor；R5, R6 are detection resistance；K1, K2 are
Electronic switch.
Embodiment
Referring to the drawings 1, a kind of anti-instantaneous ac scurries into insulation monitoring and warning device, including main frame, line selection apparatus, DC leakage current
Sensor.
Described main frame includes cpu data processing module, data acquisition module, balance bridge, uneven bridge circuit module,
Power module, display module, alarm module, communication module；
DC leakage current sensor card is connected to per on DC feeder all the way, and power supply is provided by described line selection apparatus, and will
The leakage current that fault branch is produced is converted to DC voltage and is uploaded to line selection apparatus；
Main frame detects the busbar voltage and positive and negative busbar voltage-to-ground of straight-flow system by data acquisition module in real time, and leads to
Described display module is crossed to be shown in real time, when insulating ground failure occurs for system, the positive and negative voltage-to-ground hair of straight-flow system
Raw corresponding change, the cpu data processing module starts detection bridge circuit module by analyzing.
Line selection apparatus is connected by described communication module with main frame, and the voltage data of each branch road is uploaded into master
Machine, main frame selects corresponding feeder line branch road by the change of this voltage signal, obtains grounding resistance.
Main frame intuitively shown selected fault branch and grounding resistance by display module, and by described
Alarm module carries out corresponding dry contact and audible and visual alarm.
Referring to the drawings 2, C1, C2, R1, R2 composition alternating current voltage measuring circuits.Wherein R1, R2 are sampling resistor, when there is friendship
Flee fashionable, alternating current forms loop by C1, C2, R1, R2 with the earth, and main frame passes through data collecting module collected R1, R2
The voltage change at two ends is that can determine whether whether straight-flow system occurs exchange and scurry into.
R3, R4, R5, R6, K1, K2 are insulation resistance of DC system measuring circuit, and R3, R4 is sampling resistor, and R5, R6 is inspection
Measuring resistance, K1, K2 is electronic switch；During measurement, K1 is closed first, K2 disconnects, R5 input straight-flow systems, R6 exits direct current system
System, measures R3, R4 both end voltages U1+ and U1-；Then K1 is disconnected, K2 closures, R5 exits straight-flow system, R6 input direct currents system
System, measures R3, and R4 both end voltages are U2+ and U2-；By tetra- voltages of U1+, U1-, U2+, U2-, it can be obtained according to Ohm's law
To insulation resistance of DC system Rx, Ry resistance.
Claims (7)
1. a kind of anti-instantaneous ac scurries into insulation monitoring and warning device, it is characterised in that：Including main frame, line selection apparatus, DC leakage current
Sensor；
The main frame includes cpu data processing module, data acquisition module, balance bridge, uneven bridge circuit module, power supply mould
Block, display module, alarm module and communication module；
The cpu data processing module is connected with described data acquisition module；
The data acquisition module includes multi pass acquisition electronic switch, operational amplifier and high-precision AD chip, and collection is straight in real time
Flow the positive and negative voltage-to-ground of bus, DC bus-bar voltage；
The balance bridge, uneven bridge circuit module include one group of balance resistor bridge and detection resistor bridge；
The display module is connected with described cpu data processing module；
The alarm module is connected with the cpu data processing module；
Line selection apparatus is connected with cpu data processing module by described communication module, realizes data communication；
The line selection apparatus is connected with DC leakage flow sensor；
The leakage current of branch road is converted into DC voltage and is uploaded to line selection apparatus by described DC leakage flow sensor.
2. a kind of anti-instantaneous ac according to claim 1 scurries into insulation monitoring and warning device, it is characterised in that：Described direct current
Leakage current sensor is snapped fit onto per on DC feeder all the way, and power supply, and the electric leakage that fault branch is produced are provided by line selection apparatus
Circulation is changed to DC voltage and is uploaded to line selection apparatus.
3. a kind of anti-instantaneous ac according to claim 1 scurries into insulation monitoring and warning device, it is characterised in that：The display mould
Block is using 7 cun of color touch LCDs；Device inner parameter can be modified by touching liquid-crystal display screen.
4. a kind of anti-instantaneous ac according to claim 1 scurries into insulation monitoring and warning device, it is characterised in that：Alarm module is adopted
Alerted with relay.
5. a kind of anti-instantaneous ac according to claim 1 scurries into insulation monitoring and warning device, it is characterised in that：Communication module is adopted
With three kinds of communication modes of RS232/RS485/ network interfaces, communications protocol mode is Modbus RTU modes.
6. a kind of anti-instantaneous ac according to claim 1 scurries into insulation monitoring and warning device, it is characterised in that：The direct current leakage
Current sensor uses open type DC leakage flow sensor.
7. a kind of anti-instantaneous ac according to claim 1 scurries into insulation monitoring and warning device, it is characterised in that：The route selection dress
Put and use Small Electric Current Earthing And Routing Device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720334120.4U CN206601465U (en) | 2017-03-31 | 2017-03-31 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
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| CN201720334120.4U CN206601465U (en) | 2017-03-31 | 2017-03-31 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841956A (en) * | 2017-03-31 | 2017-06-13 | 国网江苏省电力公司宿迁供电公司 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
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2017
- 2017-03-31 CN CN201720334120.4U patent/CN206601465U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841956A (en) * | 2017-03-31 | 2017-06-13 | 国网江苏省电力公司宿迁供电公司 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
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