CN204228879U - A kind of line selection apparatus of earthed system - Google Patents
A kind of line selection apparatus of earthed system Download PDFInfo
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- CN204228879U CN204228879U CN201420671403.4U CN201420671403U CN204228879U CN 204228879 U CN204228879 U CN 204228879U CN 201420671403 U CN201420671403 U CN 201420671403U CN 204228879 U CN204228879 U CN 204228879U
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- selection apparatus
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Abstract
The line selection apparatus of the utility model earthed system, comprise bus PT and circuit zero sequence CT, bus PT is arranged on the bus of earthed system, and circuit zero sequence CT is arranged in the outlet of the bus of earthed system; Also comprise route selection unit, single-phase high voltage switch and resistor; Described route selection unit is connected with single-phase high voltage switch, bus PT and circuit zero sequence CT respectively; After described single-phase high voltage switch resistors in series, be installed between the neutral point of earthed system and the earth.When system is normally run, single-phase high voltage switch disconnects, and resistor exits.After have employed the utility model, during grounding system single-phase grounding, closed single-phase high voltage switch in short-term, drop into resistor, line selection apparatus record drops into all circuit zero sequence active component of currents before and after resistor, calculates every bar circuit zero sequence active component of current changing value, and compare, select the maximum circuit of changing value as faulty line, route selection accuracy rate is high, and applicable situation is extensive.
Description
Technical field
The utility model relates to the line selection apparatus when singlephase earth fault being applicable to 6 ~ 35kV small current neutral grounding system occurs.
Background technology
At present, the single-phase earth fault line selection problem of 6 ~ 35kV small current neutral grounding system, can not get fine solution always.Especially, when the neutral by arc extinction coil grounding of small current neutral grounding system, the common line selection apparatus based on circuit zero sequence current amplitude, power direction principle, accurately cannot select faulty line.And based on the line selection apparatus of microvariations principle, although route selection accuracy rate is high, the system being provided with post-set arc suppression coils can only be applied in, cannot be applied in isolated neutral or be provided with the system of preset arc suppression coil, application scenario is obviously restricted.
Summary of the invention
In order to solve the technical matters that existing line selection apparatus route selection accuracy rate is low, application scenario is limited, the utility model provides a kind of line selection apparatus of earthed system, this device route selection accuracy rate is high, applied range, can be applied in all small current neutral grounding systems, comprise isolated neutral, neutral point through with mode arc-suppression grounded and the neutral point system through presetting system arc-suppression grounded.
The utility model solves the technical scheme that its technical matters adopts: the line selection apparatus of this earthed system, and comprise bus PT and circuit zero sequence CT, bus PT is arranged on the bus of earthed system, and circuit zero sequence CT is arranged in the outlet of the bus of earthed system; Also comprise route selection unit, single-phase high voltage switch and resistor; Described route selection unit is connected with single-phase high voltage switch, bus PT and circuit zero sequence CT respectively; After described single-phase high voltage switch resistors in series, be installed between the neutral point of earthed system and the earth.
Preferably, the neutral point of described earthed system is: the neutral point of earthed system main-transformer, or the neutral point of the grounding transformer of earthed system.
Preferably, if described earthed system itself does not have neutral point, then described line selection apparatus also comprises grounding transformer, and the neutral point of described earthed system is the neutral point of the grounding transformer of line selection apparatus, and the input side of the grounding transformer of described line selection apparatus is arranged on the bus of earthed system.
Described route selection unit comprises core processor, and the analog signal detection module be connected with core processor respectively, quantity of state detection module, switch control module and ethernet communication module, described quantity of state detection module is connected with single-phase high voltage switch, described analog signal detection module is connected with the bus of earthed system, and described switch control module is connected with single-phase high voltage switch.
Location design of the present utility model is as follows: when system generation single-phase earthing, and when neutral point drops into resistor, the active current flowing through resistor can flow back to system through earth point, namely system is flowed back to through faulty line zero sequence loop, so, drop into before and after resistor, the real component changing value of faulty line zero-sequence current is maximum, and the real component of regular link zero-sequence current is substantially constant.When system is normally run, single-phase high voltage switch disconnects, and resistor exits the utility model line selection apparatus.When system single-phase earthing, closed single-phase high voltage switch in short-term, drop into resistor, route selection unit record drops into the real component of all circuit zero-sequence currents before and after resistor, calculate the real component changing value of every bar circuit zero-sequence current, and compare, select the maximum circuit of real component changing value as faulty line.
Compared with prior art, the beneficial effects of the utility model are:
1, adopt and carry out selection method based on resistance in switching, the route selection accuracy rate of line selection apparatus is high.
2, application scenario is wide, can be applied to all small current neutral grounding systems.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the hardware block diagram of route selection unit.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, the line selection apparatus of the utility model earthed system comprises route selection unit 1, grounding transformer 2, single-phase high voltage switch 3, resistor 4, bus PT5 and circuit zero sequence CT6, and route selection unit 1 is connected with single-phase high voltage switch 3, bus PT5 and circuit zero sequence CT6 respectively.The input side of grounding transformer 2 is arranged on earthed system bus, and bus PT5 is arranged on system busbar, and circuit zero sequence CT6 is arranged in the outlet of system busbar.After single-phase high voltage switch 3 resistors in series 4, be installed between the neutral point of grounding transformer 2 and the earth.The control contact of the secondary voltage of bus PT, the secondary current of circuit zero sequence CT, single-phase high voltage switch all accesses route selection unit 1.
It should be noted that, when the existing neutral point of small current neutral grounding system main-transformer itself, or small current neutral grounding system is when having grounding transformer, the utility model can not install separately grounding transformer 2, and the switching loop of resistor 4 is directly installed on system and has neutral point place.If small current neutral grounding system itself does not have neutral point or grounding transformer, the utility model just needs additionally to introduce grounding transformer 2, designs the neutral point in the switching loop of resistor 4.
See Fig. 2, route selection unit 1 comprises core processor, and the analog signal detection module be connected with core processor respectively, quantity of state detection module, switch control module, tripping operation outlet, ethernet communication module, clock module, watchdog module, memory module, man-machine interface and power module.Core processor adopts dsp processor, the optional TMS320F28335 of model.
Analog signal detection module is connected with the bus of earthed system, samples to system busbar voltage and line current.Analog signal detection module comprises the analog signal isolating circuit, amplifying circuit, filtering circuit and the A/D convertor circuit that connect successively, for system busbar voltage and line current are converted to digital signal from simulating signal.Wherein the chip model of A/D convertor circuit is chosen as MAX11056,8 the analog channel inputs of every sheet, 40 the analog channel inputs of 5 compositions.
Quantity of state detection module is connected with single-phase high voltage switch 3, specifically comprises photoelectrical coupler, level transferring chip etc., and its effect is that the switching signal of single-phase high voltage switch 3 is converted to digital signal; And the control contact of single-phase high voltage switch 3 is connected to the input terminal of state detection module, make core processor can deciliter state of Real-time Obtaining single-phase high voltage switch, judge that whether switch motion is normal.
Switch control module is connected with single-phase high voltage switch, comprises photoelectrical coupler and relay etc., for control single-phase high voltage switch deciliter and remote signalling amount output; Remote signalling amount refers to the semaphores such as the own fault of singlephase earth fault, device, faulty line code, outputs communication backstage by rhabdion point.Tripping operation outlet comprises multiple photoelectrical coupler, is trip signal electrical outlet.Ethernet communication module comprises communication protocol modular converter, serial ports, Ethernet interface, communicates for transferring serial ports MODBUS communication to Ethernet IEC61850.Wherein the process core of communication protocol modular converter is PowerPC processor, and model is PPC405EP, and it and core processor communication interface are serial ports, is Ethernet with external device communication interface.Clock module forms primarily of real-time timepiece chip, provides system real-time time.Watchdog module forms primarily of external watchdog chip, charge of overseeing core processor ruuning situation, once detect that core processor crashes, is then resetted and restarts.Memory module is made up of sram chip and FLASH chip, and the former is as core processor exented memory, the latter as data storage medium, for preserving definite value, record etc.Man-machine interface forms primarily of touch-screen, provides and User Interface, comprises realtime curve, parameter display and setting.In the present embodiment, touch-screen adopts 5.7 cun of electric resistance touch screens, and this touch-screen provides general MCU interface, and its display interface is connected with dsp processor universal I/O port, touches interface and is connected with dsp processor SPI interface.Dsp processor drives touch-screen display by universal I/O port, and reads user's touch operation information by SPI interface, realizes human-computer interaction interface.Each functional module that power module is route selection unit provides power supply.
Grounding transformer 2 adopts dry-type earth transformer, and single-phase high voltage switch 3 adopts single-phase high voltage contactor, and resistor 4 adopts rated current design load to be the stainless steel resistor of 30A, and bus PT5 is Electromagnetic PT, and circuit zero sequence CT6 is electromagnetic type CT.The quantity of circuit zero sequence CT is preferably 36, can be at most 128.Single-phase high voltage switch 3 preferably selects high-pressure vacuum switch.
When route selection unit inspection exceeds initiation value to busbar voltage or line current, route selection function on.Route selection unit record line current real component, closed single-phase high voltage switch, drops into resistor afterwards, and after stable, the real component of record circuit electric current again, disconnects single-phase high voltage switch subsequently, exit resistor.Then, the real component that route selection unit calculates every bar line current drops into the changing value before and after resistor, and carries out size sequence.Circuit maximum for real component changing value is judged to faulty line by route selection unit, and the information of faulty line is sent to communication backstage by ethernet communication module.
Above-described embodiment is a kind of embodiment of the present utility model; but embodiment of the present utility model does not limit therewith; be engaged in these those skilled in the art do not deviate from the utility model spirit and principle under make any amendment, replacement, improvement, be all included in protection domain of the present utility model.
Claims (10)
1. the line selection apparatus of an earthed system, comprise bus PT and circuit zero sequence CT, bus PT is arranged on the bus of earthed system, and circuit zero sequence CT is arranged in the outlet of the bus of earthed system, it is characterized in that, also comprise route selection unit, single-phase high voltage switch and resistor; Described route selection unit is connected with single-phase high voltage switch, bus PT and circuit zero sequence CT respectively; After described single-phase high voltage switch resistors in series, be installed between the neutral point of earthed system and the earth.
2. line selection apparatus according to claim 1, is characterized in that, the neutral point of described earthed system is: the neutral point of earthed system main-transformer, or the neutral point of the grounding transformer of earthed system.
3. line selection apparatus according to claim 1, it is characterized in that, described line selection apparatus also comprises grounding transformer, and the neutral point of described earthed system is the neutral point of the grounding transformer of line selection apparatus, and the input side of the grounding transformer of described line selection apparatus is arranged on the bus of earthed system.
4. line selection apparatus according to claim 1, it is characterized in that, described route selection unit comprises core processor, and the analog signal detection module be connected with core processor respectively, quantity of state detection module, switch control module and ethernet communication module, described quantity of state detection module is connected with single-phase high voltage switch, described analog signal detection module is connected with the bus of earthed system, and described switch control module is connected with single-phase high voltage switch.
5. line selection apparatus according to claim 4, is characterized in that, described analog signal detection module comprises the analog signal isolating circuit, amplifying circuit, filtering circuit and the A/D convertor circuit that connect successively.
6. line selection apparatus according to claim 4, is characterized in that, described route selection unit also comprises the watchdog module be connected with core processor.
7. line selection apparatus according to claim 4, is characterized in that, described route selection unit also comprises the clock module be connected with core processor.
8. line selection apparatus according to claim 4, is characterized in that, described route selection unit also comprises the man-machine interface be connected with core processor.
9. line selection apparatus according to claim 3, is characterized in that, described grounding transformer is dry-type earth transformer.
10. line selection apparatus according to claim 1, is characterized in that, described single-phase high voltage switch adopts single-phase high voltage contactor, and resistor adopts stainless steel resistor, and bus PT is Electromagnetic PT, and circuit zero sequence CT is electromagnetic type CT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671403.4U CN204228879U (en) | 2014-11-11 | 2014-11-11 | A kind of line selection apparatus of earthed system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671403.4U CN204228879U (en) | 2014-11-11 | 2014-11-11 | A kind of line selection apparatus of earthed system |
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| CN204228879U true CN204228879U (en) | 2015-03-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223469A (en) * | 2015-09-30 | 2016-01-06 | 国网浙江省电力公司绍兴供电公司 | A kind of line-selected earthing device being applicable to intelligent substation |
-
2014
- 2014-11-11 CN CN201420671403.4U patent/CN204228879U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223469A (en) * | 2015-09-30 | 2016-01-06 | 国网浙江省电力公司绍兴供电公司 | A kind of line-selected earthing device being applicable to intelligent substation |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20201111 |
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| CF01 | Termination of patent right due to non-payment of annual fee |