CN203658521U - Mobile insulation supervision instrument of transformer station DC system - Google Patents
Mobile insulation supervision instrument of transformer station DC system Download PDFInfo
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- CN203658521U CN203658521U CN201320685521.6U CN201320685521U CN203658521U CN 203658521 U CN203658521 U CN 203658521U CN 201320685521 U CN201320685521 U CN 201320685521U CN 203658521 U CN203658521 U CN 203658521U
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- 238000009413 insulation Methods 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims description 17
- 238000010586 diagram Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000005693 optoelectronics Effects 0.000 abstract 1
- 238000004088 simulation Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The utility model discloses a mobile insulation supervision instrument of a transformer station DC system. The supervision instrument comprises a supervision host, a data acquisition device, and a mobile sensor. The supervision host comprises a bridge circuit, a protection circuit, an ultralowfrequency signal generator, an analog-to-digital conversion circuit, a microprocessor, an alarm device, a display device, a communication module, and an optoelectronic isolation device. The data acquisition device comprises more than one group of connected simulation selective switches, amplifiers, band pass filters, phase comparators, filters, analog-to-digital conversion circuits, and microprocessors. The mobile insulation supervision instrument of a transformer station DC system has a mobile characteristic, and can detect a plurality of circuits in the same time, and an automatic program is good in adaptability. The supervision instrument can monitor and detect on bridge of an original DC system of a transformer station, and detects impedance of original bridge, and an original circuit is set through a setup menu.
Description
Technical field
The utility model relates to a kind of insulating monitor, particularly a kind of transformer station direct current system mobile insulation monitor.
Background technology
Domestic direct supply insulation monitoring and warning device is all fixed at present, can only be contained in the work of a certain transformer station, if insulating monitor generation equipment failure, getting rid of between monitoring device age at failure, now transforming plant DC power supply loses insulating monitor work, and to DC power source safety, operation brings hidden danger.For guaranteeing safe operation of power system, must change in time a set of general D.C. isolation monitoring equipment, carry out straight-flow system insulating monitoring.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art part, and provide one to be suitable for various straight-flow systems, to be convenient to while meeting an urgent need come into operation, thereby can in time, effectively guarantee the transformer station direct current system mobile insulation monitor of the normal operation of straight-flow system.
A kind of transformer station direct current system mobile insulation monitor; include supervision main frame; data collector and mobile sensor; described supervision main frame includes bridge diagram, holding circuit, Signal Generator of Ultra-low Frequency, analog to digital conversion circuit; microprocessor, warning device, display device, communication module, optical isolation, described bridge diagram includes balance bridge testing circuit and uneven bridge testing circuit; Holding circuit is connected with microprocessor by controlling Signal Generator of Ultra-low Frequency, bridge diagram is connected with microprocessor by analog to digital conversion, microprocessor is also connected with communication module, optical isolation, warning device and display device, and optical isolation is by serial ports connection data harvester;
Described data collector includes the more than one group analog selection switch being connected, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit and microprocessor, described analog selection switch obtains sensor current signal by mobile sensor, the phase comparator of synchronizing signal to data collector exported in described supervision host computer control Signal Generator of Ultra-low Frequency work simultaneously, supervising host supervision after busbar grounding, main frame injects ultra-low frequency signal source to straight-flow system, the induction current that reception mobile sensor is sent in data acquisition here is through analog selection switch, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit is sent into microprocessor and is processed, send into supervision main frame by the serial line interface of microprocessor again,
Described mobile sensor is stuck on each branch road loop of bus, if having resistance eutral grounding on branch road loop, the sensor being contained on this branch road produces induction current, and the resistance of faradic size and grounding resistance is inversely proportional to.
Transformer station direct current system mobile insulation monitor of the present utility model, can realize straight-flow system line line ground connection, grounding is searched, overvoltage/undervoltage detects, and provide warning message output and display device to show according to testing result, also can send data to host computer because the utility model has been equipped with two electric bridges by communication interface circuit simultaneously, therefore can use in different transformer station direct current systems, owing to having adopted phase comparator in data collector, it can eliminate the impact on measurement of Grounding Resistance degree of accuracy of ground capacitance on branch road loop, also can overcome asynchronous AC signal on bus disturbs simultaneously.Owing to having adopted mobile sensor, therefore multiple transformer stations, as long as adopt a set of mobile insulation detector equipment, can save large number quipments expense like this.
Being set as of null-type bridge circuit and unbalance bridge circuit in described bridge diagram: set according to the principle of scene original straight-flow system power supply monitoring instrument, in the time that the circuit of original transformer station is balancing circuitry, if electric bridge can not exit after equipment produces fault, in the time dropping into again transformer station direct current system mobile insulation monitor, while first adopting unbalanced circuit monitoring, the modified value of setting device parameter is set as 0 and drops into and measure again, measure the resistance value on balance bridge on original equipment, after the resistance value of measuring is done to modified value and is revised, select again balancing circuitry to measure, monitor is in the time asking for stake resistance, CPU can change the coefficient in former computing formula according to the modified value of setting, can eliminate former balancing circuitry impact, make the monitoring of equipment that drops into again accurate, can not produce wrong report, in the time that the circuit of original transformer station is unbalanced circuit, if former straight-flow system power supply monitoring equipment produces after fault, for the device that prevents two cover unbalanced circuit work drops into simultaneously, the error detection causing or wrong report, need first by after failed equipment power-off, in like manner adopt above-mentioned unbalanced bridge method to measure, carry out data correction, and then drop into unbalanced circuit operation.Due to unbalanced circuit monitoring, computing formula more complicated, when to larger stake resistance, computational accuracy is poor, therefore takes to test calibration steps, deposits the data list of experiment gained in register, carry out computation of table lookup processing by former setting modified value again, eliminate former balancing circuitry to the Accuracy of measuring, make the monitoring of equipment that drops into again accurate, can not produce wrong report.
Described mobile sensor is caliper brake movable sensor, and described clamp are that ferromagnetic material is made, and adopts electromagnetic screen.
Described clamp are the caliper brake detection probe that disposes different size and shape.
Amplifier in described data collector is operational amplifier and the data amplifier that adopts low noise, low drift, low-power consumption, high-isolation.
In sum, the utility model following advantage compared to existing technology:
Transformer station direct current system mobile insulation monitor of the present utility model, there is portable feature, can detect again multiple loops simultaneously, and automated procedures degree strong adaptability, can supervise inspection at the electric bridge of the original straight-flow system of transformer station again, but detects the impedance of original electric bridge, by setting menu, original circuit is set, the balance bridge that detects original system when the normal operation of shielding, use equipment recovers normal runnable interface, stand-by equipment that can be using the equipment of this cover as multiple transformer stations.The application of transformer station direct current system mobile insulation monitor of the present utility model has improved the safety and reliability of operation of power networks, economic and social profit is obvious: multiple transformer stations, as long as adopt a set of mobile insulation detector equipment, can save large number quipments expense like this; Because automation degree of equipment is high, conveniently moving, has improved the efficiency that straight-flow system insulation fault is got rid of by transformer station greatly, has greatly saved the loss of supply causing because getting rid of insulation fault.Also during effectively avoiding supervisory device to damage, the operations staff of transformer station's (particularly unattended station) must arrive at a station and regularly patrol survey simultaneously, has saved the input of manpower.
Accompanying drawing explanation
Fig. 1 is that the circuit of the utility model transformer station direct current system mobile insulation monitor forms.
Embodiment
Below in conjunction with embodiment, the utility model is described in more detail.
Embodiment 1
A kind of transformer station direct current system mobile insulation monitor, include supervision main frame, data collector and mobile sensor, described supervision main frame includes bridge diagram, holding circuit, Signal Generator of Ultra-low Frequency, analog to digital conversion circuit, microprocessor, warning device, display device, communication module, optical isolation, described holding circuit realizes bus monitoring, detect after busbar grounding at bridge diagram, the work of holding circuit control Signal Generator of Ultra-low Frequency synchronous output synchronizing signal are to data collector, described bridge diagram includes balance bridge testing circuit and uneven bridge testing circuit, holding circuit is controlled Signal Generator of Ultra-low Frequency by triggering and is connected with microprocessor, bridge diagram is connected with microprocessor by analog to digital conversion, microprocessor is also connected with communication module, optical isolation, warning device and display device, and photoelectricity isolation is by serial ports connection data harvester,
Described data collector includes the more than one group analog selection switch being connected, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit and microprocessor, described analog selection switch obtains sensor current signal by mobile sensor, the phase comparator of synchronizing signal to data collector exported in described supervision host computer control Signal Generator of Ultra-low Frequency work simultaneously, supervising host supervision after busbar grounding, main frame injects ultra-low frequency signal source to straight-flow system, the induction current that reception mobile sensor is sent in data acquisition here is through analog selection switch, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit is sent into microprocessor and is processed, send into supervision main frame by the serial line interface of microprocessor again,
Described mobile sensor is stuck on each branch road loop of bus, if having resistance eutral grounding on branch road loop, the sensor being contained on this branch road produces induction current, and the resistance of faradic size and grounding resistance is inversely proportional to.
Being set as of null-type bridge circuit and unbalance bridge circuit in described bridge diagram: set according to the principle of scene original straight-flow system power supply monitoring instrument, in the time that the circuit of original transformer station is balancing circuitry, if electric bridge can not exit after equipment produces fault, in the time dropping into again transformer station direct current system mobile insulation monitor, while first adopting unbalanced circuit monitoring, the modified value of setting device parameter is set as 0 and drops into and measure again, measure the resistance value on balance bridge on original equipment, after the resistance value of measuring is done to modified value and is revised, select again balancing circuitry to measure, monitor is in the time asking for stake resistance, CPU can change the coefficient in former computing formula according to the modified value of setting, can eliminate former balancing circuitry impact, make the monitoring of equipment that drops into again accurate, can not produce wrong report, in the time that the circuit of original transformer station is unbalanced circuit, if former straight-flow system power supply monitoring equipment produces after fault, for the device that prevents two cover unbalanced circuit work drops into simultaneously, the error detection causing or wrong report, need first by after failed equipment power-off, in like manner adopt above-mentioned unbalanced bridge method to measure, carry out data correction, and then drop into unbalanced circuit operation.Due to unbalanced circuit monitoring, computing formula more complicated, when to larger stake resistance, computational accuracy is poor, therefore takes to test calibration steps, deposits the data list of experiment gained in register, carry out computation of table lookup processing by former setting modified value again, eliminate former balancing circuitry to the Accuracy of measuring, make the monitoring of equipment that drops into again accurate, can not produce wrong report.Described mobile sensor is caliper brake movable sensor, and described clamp are that ferromagnetic material is made, and adopts electromagnetic screen.Described clamp are the caliper brake detection probe that disposes different size and shape.
Described data collector adopts operational amplifier and the data amplifier of low noise, low drift, low-power consumption, high-isolation, high-precision A/D converter, the chip microprocessor that function is stronger, form narrow band filter, phase comparator, the thick signal converter of essence, and carry out information and date processing, measured value automatic calibration, by designing strong, the highly sensitive circuit of new antijamming capability and new signal processing method, improves sensitivity and the antijamming capability of detection instrument.Circuit forms as (figure five), if having resistance eutral grounding on branch road loop, the sensor being contained on this branch road produces induction current, and the resistance of faradic size and grounding resistance is inversely proportional to.Sensor current signal is changed, is sent CPU to carry out data processing, then send into main frame by RS485 interface through analog selection switch, amplification, bandpass filtering, phase bit comparison, filtering, A/D.Main frame on the one hand control signal acquisition module gathers each branch road transducing signal orderlyly, receives again on the other hand the data that signal acquisition module is sent here.Phase comparator in signal acquisition module, its effect is to eliminate the impact on measurement of Grounding Resistance degree of accuracy of ground capacitance on branch road loop, also can overcome asynchronous AC signal on bus simultaneously and disturb.After treatment, liquor charging crystal display shows and output alarm the data that main frame receives on the one hand, sends data to host computer on the other hand by communication interface circuit.
It is same as the prior art that the present embodiment is not stated part.
Claims (4)
1. a transformer station direct current system mobile insulation monitor, it is characterized in that: include supervision main frame, data collector and mobile sensor, described supervision main frame includes bridge diagram, holding circuit, Signal Generator of Ultra-low Frequency, analog to digital conversion circuit, microprocessor, warning device, display device, communication module, optical isolation, described holding circuit realizes bus monitoring, detect after busbar grounding at bridge diagram, the work of holding circuit control Signal Generator of Ultra-low Frequency synchronous output synchronizing signal are to data collector, described bridge diagram includes balance bridge testing circuit and uneven bridge testing circuit, holding circuit is controlled Signal Generator of Ultra-low Frequency by triggering and is connected with microprocessor, bridge diagram is connected with microprocessor by analog to digital conversion, microprocessor is also connected with communication module, optical isolation, warning device and display device, and photoelectricity isolation is by serial ports connection data harvester,
Described data collector includes the more than one group analog selection switch being connected, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit and microprocessor, described analog selection switch obtains sensor current signal by mobile sensor, the phase comparator of synchronizing signal to data collector exported in described supervision host computer control Signal Generator of Ultra-low Frequency work simultaneously, supervising host supervision after busbar grounding, main frame injects ultra-low frequency signal source to straight-flow system, the induction current that reception mobile sensor is sent in data acquisition here is through analog selection switch, amplifier, bandpass filter, phase comparator, wave filter, analog to digital conversion circuit is sent into microprocessor and is processed, send into supervision main frame by the serial line interface of microprocessor again,
Described mobile sensor is stuck on each branch road loop of bus.
2. a kind of transformer station direct current system mobile insulation monitor according to claim 1, is characterized in that: described mobile sensor is caliper brake movable sensor, and described clamp are that ferromagnetic material is made, and adopts electromagnetic screen.
3. a kind of transformer station direct current system mobile insulation monitor according to claim 2, is characterized in that: described clamp are the caliper brake detection probe that disposes different size and shape.
4. a kind of transformer station direct current system mobile insulation monitor according to claim 3, is characterized in that: the amplifier in described data collector is operational amplifier and the data amplifier that adopts low noise, low drift, low-power consumption, high-isolation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320685521.6U CN203658521U (en) | 2013-11-01 | 2013-11-01 | Mobile insulation supervision instrument of transformer station DC system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320685521.6U CN203658521U (en) | 2013-11-01 | 2013-11-01 | Mobile insulation supervision instrument of transformer station DC system |
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| Publication Number | Publication Date |
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| CN203658521U true CN203658521U (en) | 2014-06-18 |
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| CN201320685521.6U Expired - Fee Related CN203658521U (en) | 2013-11-01 | 2013-11-01 | Mobile insulation supervision instrument of transformer station DC system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360215A (en) * | 2014-11-12 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Detection device for multi-point earthing fault of small bus N600 |
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| 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 |
| CN106990306A (en) * | 2017-04-14 | 2017-07-28 | 国家电网公司 | A kind of transforming plant DC circuit test device |
-
2013
- 2013-11-01 CN CN201320685521.6U patent/CN203658521U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589004A (en) * | 2014-10-13 | 2016-05-18 | 国家电网公司 | Method and device for judging substation relay protection-used PT secondary common circuit single-point grounding |
| CN104360215A (en) * | 2014-11-12 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Detection device for multi-point earthing fault of small bus N600 |
| CN104360215B (en) * | 2014-11-12 | 2017-10-03 | 江苏省电力公司淮安供电公司 | N600 multipoint earth faults detection means |
| 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 |
| CN106990306A (en) * | 2017-04-14 | 2017-07-28 | 国家电网公司 | A kind of transforming plant DC circuit test device |
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| 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: 20140618 Termination date: 20201101 |