CN103675613B - Transformer station DC system movable type insulation supervision instrument - Google Patents
Transformer station DC system movable type insulation supervision instrument Download PDFInfo
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- CN103675613B CN103675613B CN201310534570.4A CN201310534570A CN103675613B CN 103675613 B CN103675613 B CN 103675613B CN 201310534570 A CN201310534570 A CN 201310534570A CN 103675613 B CN103675613 B CN 103675613B
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- 238000009413 insulation Methods 0.000 title claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 29
- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000012937 correction Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000005622 photoelectricity Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 230000002463 transducing effect Effects 0.000 description 1
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Abstract
The invention discloses a kind of transformer station DC system movable type insulation supervision instrument; include supervision main frame; data acquisition device and mobile sensor; described supervision main frame includes bridge circuit, protection circuit, Signal Generator of Ultra-low Frequency, analog to digital conversion circuit, microprocessor, warning device, display device, communication module, optical isolation.Described data acquisition device includes more than one group of the analog selection being connected switch, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit and microprocessor.The transformer station direct current system mobile insulation monitor of the present invention, with portable feature, multiple loops can be detected simultaneously again, and automated procedures degree strong adaptability, prison inspection can be carried out in the electric bridge of the original straight-flow system of transformer station again, but the impedance of original electric bridge is detected, by setting menu to original circuit configuration.
Description
Technical field
The present invention relates to a kind of insulating monitoring instrument, particularly a kind of transformer station DC system movable type insulation supervision instrument.
Background technology
Domestic dc source insulation monitoring and warning device is all fixed at present, can only be mounted in a certain work of transformer substation, such as
Equipment fault occurs for fruit insulating monitor, and during monitoring device failure is excluded, now transforming plant DC power supply loses insulation
Supervisory device is worked, and hidden danger is brought to DC power source safety operation.To ensure safe operation of power system, it is necessary to change one in time
General D.C. isolation monitoring device is covered, straight-flow system insulating monitoring is carried out.
The content of the invention
It is an object of the invention in place of overcoming the deficiencies in the prior art, and provide a kind of various straight-flow systems, just of being applicable
Come into operation when emergent, so as to the transformer station direct current system movement for the normal operation in time, effectively ensureing straight-flow system
Formula insulating monitoring instrument.
A kind of transformer station DC system movable type insulation supervision instrument, includes supervision main frame, data acquisition device and movement
Formula sensor, described supervision main frame includes bridge circuit, protection circuit, Signal Generator of Ultra-low Frequency, analog to digital conversion circuit,
Microprocessor, warning device, display device, communication module, optical isolation, the protection circuit realize that bus is monitored,
Bridge circuit is detected after busbar grounding, and simultaneously synchronism output synchronizing signal is arrived the work of protection circuit control Signal Generator of Ultra-low Frequency
Data acquisition device, described bridge circuit includes balance bridge detection circuit and uneven bridge detection circuit;Protection circuit is led to
Cross triggering control Signal Generator of Ultra-low Frequency with microprocessor to be connected, bridge circuit passes through analog to digital conversion circuit and microprocessor phase
Even, microprocessor is also connected with communication module, optical isolation, warning device and display device, and optical isolation passes through
Serial ports connects data acquisition device；
Described data acquisition device includes more than one group of the analog selection being connected switch, amplifier, band logical filter
Ripple device, phase comparator, wave filter, analog to digital conversion circuit and microprocessor, described analog selection switch pass through portable biography
Sensor obtains sensor current signal, and described supervision host computer control Signal Generator of Ultra-low Frequency work exports synchronizing signal and arrived simultaneously
The phase comparator of data acquisition device, after supervision host supervision to busbar grounding, main frame injects ultralow frequency to straight-flow system
Signal source, data acquisition switchs the induced-current that reception mobile sensor is sent through analog selection, amplifier, bandpass filtering
Device, phase comparator, wave filter, analog to digital conversion circuit feeding microprocessor are handled, then the serial interface for passing through microprocessor
Mouth feeding supervision main frame；
The mobile sensor is stuck on each branch-path of bus, if there is resistance eutral grounding on branch-path,
Sensor on the branch road produces induced-current, and faradic size and the resistance of grounding resistance are inversely proportional.
The transformer station DC system movable type insulation supervision instrument of the present invention, can be achieved to be grounded straight-flow system line line, branch road
Earthing searching, overvoltage/undervoltage detection, and shown according to testing result offer warning message output and display device, while can also be by number
Host computer is sent to because the present invention is equipped with two electric bridges according to by communication interface circuit, therefore can be used in different changes
In electric station DC system, due to employing phase comparator in data acquisition device, it can be eliminated on branch-path over the ground
Influence of the electric capacity to measurement of Grounding Resistance accuracy, while asynchronous AC signal interference on bus can also be overcome.Due to adopting
With mobile sensor, as long as therefore multiple transformer stations can so be saved using a set of mobile insulation detector equipment
Save large number quipments expense.
Null-type bridge circuit and unbalance bridge circuit is set as in described bridge circuit：According to live original direct current
The principle of system power supply monitor is set, when the circuit of original transformer station is null-type bridge circuit, if equipment produces event
Electric bridge can not be exited after barrier, when putting into transformer station DC system movable type insulation supervision instrument again, first using unbalanced bridge electricity
When road is monitored, the correction value of setting device parameter puts into measurement again for 0, measures the resistance on null-type bridge circuit on original equipment
Value, the resistance value measured is done after correction value is modified, reselection null-type bridge circuit measurement, monitor is asking for ground connection electricity
During resistance, CPU can change the coefficient in former computing formula according to the correction value of setting, you can eliminate former null-type bridge circuit shadow
Ring, make the monitoring of equipment put into again accurate, wrong report will not be produced；When the circuit of original transformer station is unbalance bridge circuit,
If former straight-flow system power supply monitoring equipment is produced after failure, to prevent that the device of two sets of unbalance bridge circuit work from throwing simultaneously
Enter, caused error detection or wrong report, need after failed equipment power-off first, similarly using above-mentioned unbalance bridge circuit method
Measurement, carries out data correction, and unbalance bridge circuit operation is then put into again, due to unbalance bridge circuit monitoring, calculates public
Formula is more complicated, and when to relatively large grounded resistance, computational accuracy is poor, therefore takes test inhabitant area method, by obtained by experiment
Data list is stored in register, then carries out computation of table lookup processing by original setting correction value, eliminates former null-type bridge circuit to measurement
Precision influence, make the monitoring of equipment that puts into again accurate, wrong report will not be produced.
Described mobile sensor is caliper brake movable sensor, and described clamp are made up of ferromagnetic material, and is used
Electromagnetic shielding.
Described clamp are the caliper brake detection probe for being configured with different size and shapes.
Amplifier in described data acquisition device is using low noise, low drifting, low-power consumption, the computing of high-isolation
Amplifier and data amplifier.
The workflow of the microprocessor of described supervision main frame is：
After correct parameter setting is carried out to mobile insulation monitor, supervisory device normal operation is carried out in real time
Busbar voltage and bus insulation against ground detection,
When the working voltage and device that dc bus is gathered set superpressure or under-voltage definite value to be compared, beyond setting definite value
" bus superpressure " or " bus is under-voltage " alarm when afterwards, is then sent, driving host apparatus panel " overpressure alarm " or " under-voltage report is lighted
It is alert " indicator lamp, " ultra under-pressure alarm " hard contact is also turned on,
Then according to the electric bridge of setting, bus insulation against ground situation is detected, is set when detection bus resistance to earth value is less than
During insulaion resistance definite value, then " insulation alarm " is sent, light driving host apparatus panel " insulation alarm " indicator lamp, be also turned on
" insulation alarm " hard contact,
After detection busbar grounding, host CPU controls Signal Generator of Ultra-low Frequency to inject ultralow frequency AC signal to bus,
Synchronizing signal is simultaneously emitted by the phase-contrast device of data acquisition device,
Data acquisition device switchs the induced-current that reception mobile sensor is sent through analog selection, amplifier, band
Bandpass filter, phase comparator, wave filter, analog to digital conversion circuit feeding microprocessor are handled, then pass through microprocessor
Serial line interface feeding supervision main frame, supervision main frame is by road inspection branch road sample information, and described information includes amplitude and phase, with dress
Install fixed grounding threshold value to be compared, so as to judge ground connection branch road and grounding resistance, detect branch road hair
After raw ground connection, " branch road alarm " is sent, driving host apparatus panel " branch road alarm " indicator lamp is lighted, is also turned on " branch road report
It is alert " hard contact, if to the whole inspections of all branch roads one time, not finding to be grounded branch road, then returning to starting point progress female
Line is detected, repeats above-mentioned work,
After the said equipment alarm, CPU will be while communication control module, will be alarmed and dynamic by the communication modes such as 485,232
Make information and upload remote monitoring system.
In summary, present invention advantage following compared with prior art：
The transformer station direct current system mobile insulation monitor of the present invention, with portable feature, can detect many simultaneously again
Individual loop, and automated procedures degree strong adaptability, can carry out prison inspection, but detection in the electric bridge of the original straight-flow system of transformer station again
Go out the impedance of original electric bridge, by setting menu to original circuit configuration, shielding detects the flat of original system when normally running
Heng Qiao, normal runnable interface is recovered using equipment, can using this complete equipment as multiple transformer stations stand-by equipment.The present invention
The application of transformer station DC system movable type insulation supervision instrument improve the safety and reliability of operation of power networks, economy and society
Meeting benefit is obvious：As long as multiple transformer stations can so save large number quipments using a set of mobile insulation detector equipment
Expense；Because automation degree of equipment is high, conveniently moving substantially increases the effect that transformer station excludes straight-flow system insulation fault
Rate, greatly save because exclude insulation fault and caused by the loss of supply.Also it is prevented effectively from during supervisory device is damaged and becomes simultaneously
Power station（Particularly unattended station）Operations staff must arrive at a station timing monitoring, save the input of manpower.
Brief description of the drawings
Fig. 1 is that the circuit of transformer station DC system movable type insulation supervision instrument of the present invention is constituted.
Fig. 2 is the workflow diagram for supervising host microprocessors.
Embodiment
The present invention is described in more detail with reference to embodiment.
Embodiment 1
A kind of transformer station DC system movable type insulation supervision instrument, includes supervision main frame, data acquisition device and movement
Formula sensor, described supervision main frame includes bridge circuit, protection circuit, Signal Generator of Ultra-low Frequency, analog to digital conversion circuit,
Microprocessor, warning device, display device, communication module, optical isolation, the protection circuit realize that bus is monitored,
Bridge circuit is detected after busbar grounding, and simultaneously synchronism output synchronizing signal is arrived the work of protection circuit control Signal Generator of Ultra-low Frequency
Data acquisition device, described bridge circuit includes balance bridge detection circuit and uneven bridge detection circuit;Protection circuit is led to
Cross triggering control Signal Generator of Ultra-low Frequency with microprocessor to be connected, bridge circuit is connected by analog-to-digital conversion with microprocessor,
Microprocessor is also connected with communication module, optical isolation, warning device and display device, and Phototube Coupling is connected by serial ports
Data acquisition device；
Described data acquisition device includes more than one group of the analog selection being connected switch, amplifier, band logical filter
Ripple device, phase comparator, wave filter, analog to digital conversion circuit and microprocessor, described analog selection switch pass through portable biography
Sensor obtains sensor current signal, and described supervision host computer control Signal Generator of Ultra-low Frequency work exports synchronizing signal and arrived simultaneously
The phase comparator of data acquisition device, after supervision host supervision to busbar grounding, main frame injects ultralow frequency to straight-flow system
Signal source, data acquisition switchs the induced-current that reception mobile sensor is sent through analog selection, amplifier, bandpass filtering
Device, phase comparator, wave filter, analog to digital conversion circuit feeding microprocessor are handled, then the serial interface for passing through microprocessor
Mouth feeding supervision main frame；
The mobile sensor is stuck on each branch-path of bus, if there is resistance eutral grounding on branch-path,
Sensor on the branch road produces induced-current, and faradic size and the resistance of grounding resistance are inversely proportional.
Null-type bridge circuit and unbalance bridge circuit is set as in described bridge circuit：According to live original direct current
The principle of system power supply monitor is set, when the circuit of original transformer station is balancing circuitry, if equipment is produced after failure
Electric bridge can not be exited, when putting into transformer station DC system movable type insulation supervision instrument again, when first being monitored using unbalanced circuit,
The correction value of setting device parameter is set as that 0 puts into measurement again, measures the resistance value on balance bridge on original equipment, by the electricity measured
Resistance is done after correction value is modified, the measurement of reselection balancing circuitry, and monitor is when asking for earth resistance, and CPU can be according to setting
Fixed correction value changes the coefficient in former computing formula, you can eliminates former balancing circuitry influence, makes the monitoring of equipment put into again
Accurately, wrong report will not be produced；When the circuit of original transformer station is unbalanced circuit, if former straight-flow system power supply monitoring equipment production
After raw failure, to prevent that the device of two sets of unbalanced circuit work from putting into simultaneously, caused error detection or wrong report are needed first by failure
After installation's power source is closed, similarly measured using above-mentioned unbalanced bridge method, carry out data correction, uneven electricity is then put into again
Run on road.Due to unbalanced circuit monitoring, computing formula is more complicated, and when to relatively large grounded resistance, computational accuracy is poor, because
This takes test inhabitant area method, by obtained by experiment data list be stored in register, then by original setting correction value tabled look-up based on
Calculation is handled, and eliminate former balancing circuitry influences on the precision of measurement, is made the monitoring of equipment put into again accurate, will not be produced wrong report.Institute
The mobile sensor stated is caliper brake movable sensor, and described clamp are made up of ferromagnetic material, and using electromagnetic shielding.Institute
The clamp stated are the caliper brake detection probe for being configured with different size and shapes.
Described data acquisition device uses low noise, low drifting, low-power consumption, the operational amplifier of high-isolation and data
Amplifier, high-precision A/D converter, the stronger chip microprocessor of function constitutes narrow band filter, phase comparator, essence
Thick signal adapter, row information of going forward side by side and data processing, measured value are corrected automatically, new strong antijamming capability, spirit by designing
The high circuit of sensitivity and new signal processing method, improve sensitivity and the antijamming capability of survey meter.If on branch-path
There is resistance eutral grounding, then the sensor on the branch road produces induced-current, faradic size and grounding resistance
Resistance is inversely proportional.Sensor current signal is switched through analog selection, amplified, bandpass filtering, phase bit comparison, filtering, A/D conversion, give
CPU carries out data processing, then sends into main frame by RS485 interfaces.Main frame one side control signal acquisition module is adopted orderlyly
Collect each branch road transducing signal, the data that signal acquisition module is sent on the other hand are received again.Phase ratio in signal acquisition module
Compared with device, it is to eliminate influence of the direct-to-ground capacitance to measurement of Grounding Resistance accuracy on branch-path that it, which is acted on, at the same can also gram
Take asynchronous AC signal interference on bus.The data that main frame is received after processing, one side liquor charging crystal display show with
Output alarm, on the other hand sends data to host computer by communication interface circuit.
The not described part of the present embodiment is same as the prior art.
Claims (5)
1. a kind of transformer station DC system movable type insulation supervision instrument, it is characterised in that：Include supervision main frame, data acquisition dress
Put and mobile sensor, described supervision main frame includes bridge circuit, protection circuit, Signal Generator of Ultra-low Frequency, modulus
Change-over circuit, microprocessor, warning device, display device, communication module, optical isolation, the protection circuit are realized female
Line is monitored, after bridge circuit detects busbar grounding, protection circuit control Signal Generator of Ultra-low Frequency work and synchronism output
Synchronizing signal is to data acquisition device, and described bridge circuit includes balance bridge detection circuit and uneven bridge detects circuit;
Protection circuit is connected by triggering control Signal Generator of Ultra-low Frequency with microprocessor, bridge circuit by analog to digital conversion circuit and
Microprocessor be connected, microprocessor is also connected with communication module, optical isolation, warning device and display device, photoelectricity every
Data acquisition device is connected by serial ports from device；
Described data acquisition device include more than one group the analog selection being connected switch, amplifier, bandpass filter,
Phase comparator, wave filter, analog to digital conversion circuit and microprocessor, described analog selection switch are obtained by mobile sensor
Sensor current signal is taken, described supervision host computer control Signal Generator of Ultra-low Frequency work exports synchronizing signal and adopted to data simultaneously
The phase comparator of acquisition means, after supervision host supervision to busbar grounding, main frame injects ultra-low frequency signal source to straight-flow system,
Data acquisition device is switched the induced-current sent of mobile sensor is received through analog selection, amplifier, bandpass filter,
Phase comparator, wave filter, analog to digital conversion circuit feeding microprocessor are handled, then sent by the serial line interface of microprocessor
Enter to supervise main frame；
The mobile sensor is stuck on each branch-path of bus, if there is resistance eutral grounding on branch-path, is mounted in
Sensor on the branch road produces induced-current, and faradic size and the resistance of grounding resistance are inversely proportional, described
Balance bridge detection circuit detects being set as circuit with uneven bridge in bridge circuit：Supervised according to live original straight-flow system power supply
The principle for surveying instrument is set, when the circuit of original transformer station detects circuit for balance bridge, if equipment produces electric bridge after failure
It can not exit, when putting into transformer station DC system movable type insulation supervision instrument again, first using uneven bridge detection circuit monitoring
When, the correction value of setting device parameter puts into measurement again for 0, measures the resistance value on balance bridge detection circuit on original equipment, will
The resistance value measured is done after correction value is modified, and reselection balance bridge detection circuit measuring, monitor is asking for earth resistance
When, CPU can change the coefficient in former computing formula according to the correction value of setting, you can eliminate former balance bridge detection circuit shadow
Ring, make the monitoring of equipment put into again accurate, wrong report will not be produced；When the circuit of original transformer station is uneven bridge detection circuit
When, if former straight-flow system power supply monitoring equipment is produced after failure, to prevent the device of two sets of uneven bridge detection circuit work same
When put into, caused error detection or wrong report, needing first will be after failed equipment power-off, similarly using above-mentioned uneven bridge detection electricity
Path method is measured, and carries out data correction, and uneven bridge detection circuit operation is then put into again,
Because uneven bridge detects circuit monitoring, computing formula is more complicated, when to relatively large grounded resistance, computational accuracy compared with
Difference, therefore test inhabitant area method is taken, the data list obtained by experiment is stored in register, then looked into by original setting correction value
Meter calculation is handled, and eliminate former balance bridge detection circuit influences on the precision of measurement, makes the monitoring of equipment put into again accurate, will not produce
Raw wrong report.
2. a kind of transformer station DC system movable type insulation supervision instrument according to claim 1, it is characterised in that：Described
Mobile sensor is caliper brake movable sensor, and described clamp are made up of ferromagnetic material, and using electromagnetic shielding.
3. a kind of transformer station DC system movable type insulation supervision instrument according to claim 2, it is characterised in that：Described
Clamp are the caliper brake detection probe for being configured with different size and shapes.
4. a kind of transformer station DC system movable type insulation supervision instrument according to claim 3, it is characterised in that：Described
Amplifier in data acquisition device is to be put using low noise, low drifting, low-power consumption, the operational amplifier of high-isolation and data
Big device.
5. a kind of transformer station DC system movable type insulation supervision instrument according to claim 4, it is characterised in that：Described
The workflow of microprocessor for supervising main frame is：
After correct parameter setting is carried out to mobile insulation monitor, supervisory device normal operation carries out bus in real time
Voltage and bus insulation against ground detection,
When the working voltage and device that dc bus is gathered set superpressure or under-voltage definite value to be compared, after setting definite value
When, then " bus superpressure " or " bus is under-voltage " alarm is sent, driving host apparatus panel " overpressure alarm " or " under-voltage report is lighted
It is alert " indicator lamp, " ultra under-pressure alarm " hard contact is also turned on,
Then according to the electric bridge of setting, bus insulation against ground situation is detected, is insulated when detection bus resistance to earth value is less than to set
During resistance definite value, then " insulation alarm " is sent, light driving host apparatus panel " insulation alarm " indicator lamp, be also turned on " absolutely
Edge is alarmed " hard contact,
After detection busbar grounding, host CPU controls Signal Generator of Ultra-low Frequency to inject ultralow frequency AC signal to bus, simultaneously
Synchronizing signal is sent to the phase-contrast device of data acquisition device,
Data acquisition device switchs the induced-current that reception mobile sensor is sent through analog selection, amplifier, band logical filter
Ripple device, phase comparator, wave filter, analog to digital conversion circuit feeding microprocessor are handled, then pass through the serial of microprocessor
Interface feeding supervision main frame, supervision main frame includes amplitude and phase, set with device by road inspection branch road sample information, described information
Fixed grounding threshold value is compared, so as to judge ground connection branch road and grounding resistance, is connect having detected branch road
" branch road alarm " behind ground, is sent, driving host apparatus panel " branch road alarm " indicator lamp is lighted, is also turned on " branch road alarm " hard
Contact, if to the whole inspections of all branch roads one time, not finding to be grounded branch road, then returning to starting point and carry out bus inspection
Survey, repeat above-mentioned work,
After the said equipment alarm, CPU will be while communication control module, will be alarmed and action message by 485,232 communication modes
Upload remote monitoring system.
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| CN201310534570.4A CN103675613B (en) | 2013-11-01 | 2013-11-01 | Transformer station DC system movable type insulation supervision instrument |
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| CN201310534570.4A CN103675613B (en) | 2013-11-01 | 2013-11-01 | Transformer station DC system movable type insulation supervision instrument |
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| CN103675613B true CN103675613B (en) | 2017-07-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106546825B (en) * | 2016-09-29 | 2022-07-01 | 北京国电光宇机电设备有限公司 | Intelligent wireless transmission micro-opening self-zero-drift correction microcomputer insulation comprehensive detection system |
| CN107247211A (en) * | 2017-08-14 | 2017-10-13 | 浙江省星炬科技有限公司 | A kind of AC and DC insulation fault location system |
| CN109375117A (en) * | 2018-07-31 | 2019-02-22 | 国网江苏省电力有限公司徐州供电分公司 | A kind of intelligent substation integrated power supply Insulation Inspection System based on bridge method and DC leakage current method |
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| US4466071A (en) * | 1981-09-28 | 1984-08-14 | Texas A&M University System | High impedance fault detection apparatus and method |
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| CN103675613A (en) | 2014-03-26 |
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