CN203838236U - Device for detecting electric crossing of direct-current system - Google Patents
Device for detecting electric crossing of direct-current system Download PDFInfo
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- CN203838236U CN203838236U CN201320642367.4U CN201320642367U CN203838236U CN 203838236 U CN203838236 U CN 203838236U CN 201320642367 U CN201320642367 U CN 201320642367U CN 203838236 U CN203838236 U CN 203838236U
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 11
- 239000000284 extract Substances 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007363 ring formation reaction Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a device for detecting the electric crossing of a direct-current system, and can achieve the detection of an alternating-current-series direct-current loop and a direct-current-series direct-current loop at the same time. The device specially comprises an alternating-current electric-crossing detection circuit which is used for detecting whether an alternating current is connected to the direct-current system; a direct-current electric crossing-detection circuit which is used for detecting whether a direct current is connected to the direct-current system; and a processor which is connected with the alternating-current electric-crossing detection circuit and the direct-current electric-crossing detection circuit.
Description
Technical field
The utility model relates to power technology field, relates in particular to a kind of straight-flow system crosstalk pick-up unit.
Background technology
At present, the fault of straight-flow system mainly comprises: alternating current is scurried into DC loop, other direct current seals in DC loop etc.
Wherein, under normal operation, straight-flow system and return road, AC system Shi Qiaoguiqiao road, will never there is contact in two systems, but have several possible situations below, there will be the situation of scurrying into direct current that exchanges:
(1) ac circuit cable and DC loop cable are put together, due to the aged deterioration of insulation, inner core is come in contact and cause interchange to scurry into direct current.
(2) remodel and expand in process in electric substation, because workmen is for being unfamiliar with of field apparatus, mistake snaps into DC loop by interchange and gets on.
(3) field apparatus grounded screen and direct current cables are excessively near, in the time there is zero-sequence current that equipment failure or back brake cause and flow through near direct current cables, can through cable over the ground distributed capacitance scurry in straight-flow system and go.
Scurry into after DC loop once exchange, be equivalent to apply an AC power on the directly grounded basis of DC bus, therefore the destruction that its appearance causes than the direct ground connection of direct current is again much severe, can cause operation circuit fuse melting, and breaker tripping and closing coil burns out.Make the ripple factor of DC bus reach 100% simultaneously, far exceed counter arranging and be less than 5% requirement.Like this precision equipment such as protection using integrated circuit, Microcomputer Protection is caused expendable destruction or reduces its serviceable life, once therefore occur exchanging scurrying into DC loop, should be as soon as possible by Failure elimination.
Direct current is gone here and there fault mutually, refers to that 2 covers divide between the direct supply of open shop to have or 1 above electrical connection at 1.Its connected mode may, for directly connecting or connecting by resistance, connect between some positive poles, between some negative poles, connects, anodal be connected with negative pole etc. having.
As requested, " two cover straight-flow systems should be installed by 220KV and above transformer station, normally answer open loop operation ".But due to construction of transformer substation transformation, equipment rebuilding, the factors such as personnel's maloperation, likely occur the phenomenon of two cover straight-flow system mistake cyclizations.Because the voltage status amount before and after cyclization does not change, cause the interior direct current monitoring arrangement of installing in station at present not report to the police by involutive ring.But the harmfulness of two cover straight-flow system cyclizations is apparent, mainly comprises: earth fault alarm sensitivity declines and protection malfunction chance increases; Cause two cover straight-flow system simultaneous ground fault alarms: one section of plus earth, another section of minus earth; Cause this load " decompression ", there is no working power, may cause the tripping of relevant device; Shorten service lifetime of accumulator; Cause straight-flow system fire etc.
More than comprehensive, be extremely necessary to provide a kind of crosstalk pick-up unit, can realize simultaneously and exchange the detection of scurrying into DC loop and direct current and seal in DC loop.
Utility model content
In view of this, the utility model provides a kind of straight-flow system crosstalk pick-up unit, can realize the detection that the AC in the DC loop and direct current are scurried into DC loop simultaneously.
The utility model provides a kind of straight-flow system crosstalk pick-up unit, comprising:
For detection of the interchange crosstalk testing circuit that whether seals in alternating current in straight-flow system;
For detection of whether sealing in galvanic direct current crosstalk testing circuit in straight-flow system;
And, the processor being all connected with described interchange crosstalk testing circuit and direct current crosstalk testing circuit;
Wherein, described interchange crosstalk testing circuit comprises:
The AC compounent that is used for the AC compounent of extracting straight-flow system is extracted electronic circuit;
And, for extract straight-flow system DC component DC component extract electronic circuit;
Wherein, described AC compounent extraction electronic circuit and DC component extraction electronic circuit are all serially connected between described processor and the bus of straight-flow system;
Wherein, described direct current crosstalk testing circuit comprises: voltage signal collector, voltage signal analyzer, constant current signal device, described voltage signal collector, voltage signal analyzer, processor and constant current signal device are linked in sequence, and described voltage signal collector is also connected with the bus of straight-flow system with constant current signal device.
Further, described AC compounent is extracted electronic circuit and is comprised: what be linked in sequence extracts chip, an AD sampling thief every straight wave filter, bleeder circuit, straight effective value, describedly also be connected with the bus of straight-flow system every straight wave filter, the output of a described AD sampling thief is connected to described processor.
Further, described DC component is extracted electronic circuit and is comprised: the divider, second order filter, direct current biasing device, an AD sampling thief and the reduction collector that are linked in sequence, described divider is also connected with the line line of straight-flow system, and the output of described reduction sampling thief is connected to described processor.
Further, also comprise: multiple current sensors, multiple data acquisition unit, loop diagnostor and insulation analysis device, each current sensor is arranged on feeder assembly, a data acquisition unit articulates 8 current sensors, the output of each data acquisition unit is all connected to loop diagnostor and insulation analysis device simultaneously, and the output of described loop diagnostor and insulation analysis device is connected to processor.
Further, also comprise: the clock circuit, storer and the alarm device that are all connected with described processor.
The beneficial effects of the utility model:
The utility model, comprise simultaneously and exchange crosstalk testing circuit and direct current crosstalk testing circuit, and exchange crosstalk testing circuit and direct current crosstalk testing circuit common processor, therefore can realize the detection that the AC in the DC loop and direct current are scurried into DC loop simultaneously, be user-friendly to.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is further described:
Fig. 1 is the structural representation of the first embodiment of the straight-flow system crosstalk pick-up unit that provides of the utility model.
Fig. 2 is the structural representation of the embodiment of the interchange crosstalk testing circuit 1 in Fig. 1.
Fig. 3 is the structural representation of the embodiment of the direct current crosstalk testing circuit 2 in Fig. 1.
Fig. 4 is the structural representation of the second embodiment of the straight-flow system crosstalk pick-up unit that provides of the utility model.
Embodiment
Please refer to Fig. 1, is the structural representation of the first embodiment of the straight-flow system crosstalk detection system that provides of the utility model.It mainly comprises: exchange crosstalk testing circuit 1, direct current crosstalk testing circuit 2 and processor 3, wherein exchange crosstalk testing circuit 1 and be all connected with processor 3 with direct current crosstalk testing circuit 2, both common processor.
Concrete, exchange crosstalk testing circuit 1, mainly for detection of whether sealing in alternating current in straight-flow system.Its structure can as shown in Figure 2, mainly comprise: AC compounent extracts electronic circuit 11 and DC component is extracted electronic circuit 12,
Wherein, AC compounent is got electronic circuit 11 and is mainly comprised: be linked in sequence every straight wave filter 111, bleeder circuit 112, straight effective value extracts chip 113 and an AD sampling thief 114, wherein also be connected with the bus of straight-flow system every straight wave filter 111, the output of the one AD sampling thief 114 is connected to processor 3, this AC compounent is got electronic circuit 11 by extracting AC signal every straight filtering from bus, then pass through dividing potential drop, after straight effective value extracts and modulus is sampled, send in processor and analyze, processor judges in this straight-flow system, whether to have scurried into alternating current according to the AC signal size obtaining.
Wherein, the accuracy of DC voltage sampling when DC component extraction electronic circuit 12 adopts multistage filtering to ensure to exchange crosstalk with voltage bias method, concrete it comprises: the divider 121, second order filter 122, direct current biasing device 123, an AD sampling thief 124 and the reduction collector 125 that are linked in sequence, wherein divider 121 is also connected with the bus of straight-flow system, the output of reduction sampling thief 125 is connected to processor, and wherein DC component is extracted electronic circuit 12.In the time sealing in alternating current in straight-flow system, second order filter device can filter most AC signal, remaining alternating voltage after direct current biasing device, be on the occasion of, symmetrical AC signal is filtered through after long-time average by the 2nd AD sampling thief again, finally deduct inclined to one side threshold voltage by reduction sampling thief and restore accurately real DC voltage.
Concrete, direct current crosstalk testing circuit 2, mainly for detection of whether sealing in direct current in straight-flow system.Its structure can be as shown in Figure 3, mainly comprise: voltage signal collector 21, voltage signal analyzer 22 and constant current signal device 23, wherein voltage signal collector 21, voltage signal analyzer 22, processor 3 and constant current signal device 23 are linked in sequence, and voltage signal collector 21 is also connected with the bus of straight-flow system with constant current signal device 23, concrete, voltage signal collector 21 is connected with I section and II section bus, constant current signal device 23 is connected with I section bus, go here and there mutually while judging carrying out direct current, processor control constant current signal device applies a constant current signal source to I section bus, meanwhile, voltage signal collector is sampled to I section busbar voltage and II section Bus Voltage, export to voltage signal analyzer, voltage signal analyzer judges according to two sections of busbar voltage Changing Patterns whether system exists direct current to go here and there mutually fault export to processor.
Please refer to Fig. 4, is the structural representation of the second embodiment of the straight-flow system crosstalk pick-up unit that provides of the utility model.It is except comprising the structure shown in Fig. 1, also comprise: multiple current sensors 91, multiple data acquisition units 9, loop diagnostor 6, insulation analysis device 5, clock circuit 8, storer 7 and alarm device 4, wherein each current sensor 91 is arranged on feeder assembly, for gathering the electric current of feeder assembly, a data acquisition unit articulates 8 current sensors, the output of each data acquisition unit is all connected to loop diagnostor and insulation analysis device simultaneously, the output of loop diagnostor and insulation analysis device is connected to processor, can realize the intelligent route selection of fault loop by loop diagnostor 6 and insulation analysis device 5, accurately judge fault branch.
Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (6)
1. a straight-flow system crosstalk pick-up unit, is characterized in that: comprising:
For detection of the interchange crosstalk testing circuit that whether seals in alternating current in straight-flow system;
For detection of whether sealing in galvanic direct current crosstalk testing circuit in straight-flow system;
And, the processor being all connected with described interchange crosstalk testing circuit and direct current crosstalk testing circuit;
Described interchange crosstalk testing circuit comprises:
The AC compounent that is used for the AC compounent of extracting straight-flow system is extracted electronic circuit;
And, for extract straight-flow system DC component DC component extract electronic circuit;
Wherein, described AC compounent extraction electronic circuit and DC component extraction electronic circuit are all serially connected between described processor and the bus of straight-flow system.
2. straight-flow system crosstalk pick-up unit as claimed in claim 1, it is characterized in that: described AC compounent is extracted electronic circuit and comprised: what be linked in sequence extracts chip, an AD sampling thief every straight wave filter, bleeder circuit, straight effective value, describedly also be connected with the bus of straight-flow system every straight wave filter, the output of a described AD sampling thief is connected to described processor.
3. straight-flow system crosstalk pick-up unit as claimed in claim 1, it is characterized in that: described DC component is extracted electronic circuit and comprised: the divider, second order filter, direct current biasing device, an AD sampling thief and the reduction collector that are linked in sequence, described divider is also connected with the line line of straight-flow system, and the output of described reduction sampling thief is connected to described processor.
4. straight-flow system crosstalk pick-up unit as claimed in claim 1, it is characterized in that: described direct current crosstalk testing circuit comprises: voltage signal collector, voltage signal analyzer, constant current signal device, described voltage signal collector, voltage signal analyzer, processor and constant current signal device are linked in sequence, and described voltage signal collector is also connected with the bus of straight-flow system with constant current signal device.
5. the straight-flow system crosstalk pick-up unit as described in any one in claim 1-4, it is characterized in that: also comprise: multiple current sensors, multiple data acquisition unit, loop diagnostor and insulation analysis device, each current sensor is arranged on feeder assembly, a data acquisition unit articulates 8 current sensors, the output of each data acquisition unit is all connected to loop diagnostor and insulation analysis device simultaneously, and the output of described loop diagnostor and insulation analysis device is connected to processor.
6. straight-flow system crosstalk pick-up unit as claimed in claim 5, is characterized in that: also comprise: the clock circuit, storer and the alarm device that are all connected with described processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320642367.4U CN203838236U (en) | 2013-10-17 | 2013-10-17 | Device for detecting electric crossing of direct-current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320642367.4U CN203838236U (en) | 2013-10-17 | 2013-10-17 | Device for detecting electric crossing of direct-current system |
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| CN203838236U true CN203838236U (en) | 2014-09-17 |
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| CN201320642367.4U Expired - Lifetime CN203838236U (en) | 2013-10-17 | 2013-10-17 | Device for detecting electric crossing of direct-current system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116352A (en) * | 2015-09-01 | 2015-12-02 | 国网辽宁省电力有限公司鞍山供电公司 | Mixed connection detection method of two sets of direct-current power supply systems of transformer substation |
| CN105988088A (en) * | 2015-01-30 | 2016-10-05 | 深圳奥特迅电力设备股份有限公司 | Method and system for detecting DC bus branch crossing |
| CN107741573A (en) * | 2017-10-24 | 2018-02-27 | 国网山西省电力公司电力科学研究院 | The bringing device and applying method of of ac are scurried into transforming plant DC power-supply system |
| CN107942273A (en) * | 2017-10-24 | 2018-04-20 | 国网山西省电力公司电力科学研究院 | The accuracy calibration method of monitoring device is scurried into exchange in DC power system |
| CN112798847A (en) * | 2020-12-30 | 2021-05-14 | 南方电网科学研究院有限责任公司 | Signal processing system |
-
2013
- 2013-10-17 CN CN201320642367.4U patent/CN203838236U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988088A (en) * | 2015-01-30 | 2016-10-05 | 深圳奥特迅电力设备股份有限公司 | Method and system for detecting DC bus branch crossing |
| CN105988088B (en) * | 2015-01-30 | 2018-12-04 | 深圳奥特迅电力设备股份有限公司 | A kind of method and system that detection DC bus branch is mutually altered |
| CN105116352A (en) * | 2015-09-01 | 2015-12-02 | 国网辽宁省电力有限公司鞍山供电公司 | Mixed connection detection method of two sets of direct-current power supply systems of transformer substation |
| CN105116352B (en) * | 2015-09-01 | 2018-06-26 | 国网辽宁省电力有限公司鞍山供电公司 | The double set DC power system string electro-detection methods of substation |
| CN107741573A (en) * | 2017-10-24 | 2018-02-27 | 国网山西省电力公司电力科学研究院 | The bringing device and applying method of of ac are scurried into transforming plant DC power-supply system |
| CN107942273A (en) * | 2017-10-24 | 2018-04-20 | 国网山西省电力公司电力科学研究院 | The accuracy calibration method of monitoring device is scurried into exchange in DC power system |
| CN107942273B (en) * | 2017-10-24 | 2019-12-13 | 国网山西省电力公司电力科学研究院 | accuracy calibration method for alternating current entering monitoring device in direct current power supply system |
| CN107741573B (en) * | 2017-10-24 | 2019-12-13 | 国网山西省电力公司电力科学研究院 | Applying device and applying method for fleeing-in alternating current in direct-current power supply system of transformer substation |
| CN112798847A (en) * | 2020-12-30 | 2021-05-14 | 南方电网科学研究院有限责任公司 | Signal processing system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140917 |
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| CX01 | Expiry of patent term |