CN106300262B - A kind of 220kV grade transformer protection method for substation's remote power-feeding - Google Patents
A kind of 220kV grade transformer protection method for substation's remote power-feeding Download PDFInfo
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- CN106300262B CN106300262B CN201610739279.4A CN201610739279A CN106300262B CN 106300262 B CN106300262 B CN 106300262B CN 201610739279 A CN201610739279 A CN 201610739279A CN 106300262 B CN106300262 B CN 106300262B
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- protection
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- substation
- longitudinal difference
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of guard methods of 220kV grade transformer for substation's remote power-feeding, the short leg main protection for the long range high-tension cable that 220kV optical-fiber longitudinal difference protection is switched as 220kV high voltage side of transformer to 220kV GIS, equipment for protecting optical fibre longitudinal difference infield is transforming plant protecting room, cross protection is formed with the protection zone of substation 220kV bus protection, transformer side setting in-situ protection cell configures 220kV optical-fiber longitudinal difference protection and cooperates each other as stub protection and transformer substation side optical-fiber longitudinal difference protection, the transformer differential protection with the configuration of transformer side in-situ protection cell forms cross protection simultaneously.The present invention to the failure of failure protection demultiplexes the transfer trip for pressing off lock and realizing non-ionizing energy loss after realizing unsuccessful reason and trip protection after tranformer protection movement using " remote to jump " function in 220kV optical fiber differential protective, realizing tranformer protection movement using " teletransmission " function in 220kV optical fiber differential protective.
Description
Technical field
The present invention relates to a kind of 220kV grade transformer protection methods for substation's remote power-feeding.
Background technique
Current substation or provincialism power plant, face supply district expansion and heat supply, steam supply additional demand when,
It carries out putting into the new new booster stations of substation or power plant, and accesses spare unit and spare transformer to meet supply district
Expansion and heat supply, steam supply additional demand, simultaneously, it is also desirable to for subsequent Construction of Unit reserve grid-connected conditions.And by power transformation
Stand or the limitation of the place of the new booster stations of power plant, substation or new power plant's booster stations be often arranged in have certain distance newly
Point often will appear substation or power plant and newly boost the stop spacing situation too far from supply transformer.
Substation or new power plant's booster stations are too far apart from supply transformer, can design to the protection scheme of supply transformer
Very burden is brought, if following conventional lines protection scheme, it may be assumed that the high and low pressure side electric current of transformer, voltage circuit, breaker tripping and closing are returned
Road, in this way can be because of apart from too far, the CT secondary cable distance of opposite side using conventional secondary cable connection, and load is big, causes
CT C-V characteristic is abnormal, and it is difficult to cause CT capacity type selecting, to cause the possible malfunction of differential protection, and secondary closing loop mistake
Length causes anti-super-pressure and thunder and lightning, electromagnetic interference difficult, and there are hidden danger and accidentally conjunctions, false tripping resulting from for secondary cable insulation
Risk.
Therefore, it is necessary to provide tranformer protection scheme appropriate to the transformer of remote power-feeding.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of 220kV grade transformation for substation's remote power-feeding
The guard method of device, this method are utilized using the communication optical fiber of 220kV optical-fiber longitudinal difference protection as the communication link of route protection
" remote to jump " function of 220kV optical-fiber longitudinal difference protection realizes trip protection and unsuccessful reason after tranformer protection movement, utilizes 220kV
" teletransmission " function in optical-fiber longitudinal difference protection realize the failure after tranformer protection movement to failure protection demultiplex press off lock and
It realizes the transfer trip of non-ionizing energy loss, substitutes the electrical quantity transmission of conventional secondary cable.It avoids because apart from too far, opposite side
CT secondary cable distance, load is big, causes CT C-V characteristic abnormal, causes CT capacity type selecting difficult, to cause differential
Protect may malfunction, and secondary closing loop is too long causes anti-super-pressure and thunder and lightning, electromagnetic interference difficult, secondary cable insulation
There are hidden danger and accidentally conjunctions, false tripping risk resulting from.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of guard method of the 220kV grade transformer for substation's remote power-feeding, optical-fiber longitudinal difference protection is made
For the short leg main protection for the long range high-tension cable that 220kV high voltage side of transformer to GIS switchs, equipment for protecting optical fibre longitudinal difference peace
Dress place is transforming plant protecting room, forms cross protection with the protection zone of substation bus bar protection, transformer side setting is protected on the spot
Configuration optical-fiber longitudinal difference protection in shield cell cooperates each other as stub protection and transformer substation side optical-fiber longitudinal difference protection, while and transformation
Device differential protection forms cross protection.
The range of the transformer differential protection is high voltage side of transformer casing and low-pressure side.Protective device infield is
Transformer side in-situ protection cell.
It is high using unsuccessful reason after the remote jump function progress tranformer protection movement in optical-fiber longitudinal difference protection and trip protection
Press side GIS switch operation.
It is demultiplexed using the failure after the transporting function realization tranformer protection movement in optical-fiber longitudinal difference protection to failure protection
It presses off lock and realizes the transfer trip high-pressure side GIS switch of non-ionizing energy loss.
It is above-mentioned for the 220kV grade transformer configuration tranformer protection and stub protection of substation's remote power-feeding
Protection dual configuration configuration.
For the 220kV grade transformer of substation's remote power-feeding, because the high pressure GIS switch of power supply is mounted on substation
Side, breaker fail protection scheme: transformer fault, tranformer protection movement (are free of non-ionizing energy loss), and tranformer protection is high
The tripping outlet of pressure side is connected to transformer side optical-fiber longitudinal difference protection distant jump circuit, and optical-fiber longitudinal difference protection tripping outlet high jump in opposite side presses off
It closes, while opposite side optical-fiber longitudinal difference protection far jumps start failure protection outlet and is connected to bus differential protecting unsuccessful reason circuit.
When power transformer interior fault, tranformer protection releasing failure presses off again lock out mouth access transformer side optical-fiber longitudinal difference guarantor
" teletransmission " circuit is protected, opposite side optical-fiber longitudinal difference protection teletransmission, which collects mail to export to be connected to bus differential protecting and release failure and press off again, locks back
Road.
When short leg failure, optical-fiber longitudinal difference protection movement in opposite side exports straight high jump and compresses switch, and access bus in failure outlet is poor
Dynamic protection unsuccessful reason circuit.
Transformer non-electricity protection act connects non-ionizing energy loss (protection) through non-electricity protecting device protection exit
To second " teletransmission " circuit of transformer side optical-fiber longitudinal difference protection, opposite side (booster stations side) optical-fiber longitudinal difference protection second " teletransmission " is received
Letter outlet is directly connected to high pressure GIS control box and does not open failure TJF trip(ping) circuit.Non-ionizing energy loss tripping not start failure protection is reached
The countermeasure of protection.
The invention has the benefit that
(1) present invention is large-size thermal power plant or the transformer of hydroelectric power plant and substation apart from booster stations bus distance
Overlength, it may be assumed that the too far operating condition of power supply point provides a kind of safe and reliable, the protection scheme being worthy to be popularized；
(2) the 220kV grade transformer that the present invention solves substation's remote power-feeding follows conventional lines the reality of protection scheme
Apply encountered difficulty；It avoids because load is big apart from too far, the CT secondary cable distance of opposite side, leads to CT volt-amperes of spies
It is difficult to cause CT capacity type selecting for sexual abnormality, to cause differential protection may malfunction；Avoid that closing loop is too long to be caused to resist
Super-pressure and thunder and lightning, electromagnetic interference are difficult, and there are hidden danger and the risks of accidentally conjunction resulting from, false tripping for secondary cable insulation；
(3) present invention utilizes the communication optical fibers of optical fiber differential protective as unique advantage possessed by communication link, special
It is not to utilize " remote to jump " function in optical fiber differential protective to realize transformer electric field insulation, bandwidth and the advantages such as attenuation is low
Unsuccessful reason and trip protection after protection act utilize " teletransmission " function in optical fiber differential protective to realize tranformer protection movement
The transfer trip for pressing off lock and realizing non-ionizing energy loss is demultiplexed to the failure of failure protection afterwards.
Detailed description of the invention
Fig. 1 is the new booster stations electric main wiring diagram of power plant 220kV of embodiment；
Fig. 2 is power plant's GPF (General Protection False scheme schematic diagram of embodiment；
Fig. 3 is that the power plant of embodiment uses the schematic diagram of protection scheme of the invention；
Fig. 4 is that the transformer side optical difference protection of the embodiment of the present invention is far jumped and teletransmission is opened into schematic diagram；
Fig. 5 is that the 220kV booster stations of the embodiment of the present invention protect room optical difference protection movement outlet schematic diagram.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
A power plant is provincialism power plant, and supply district is mainly the city A.There are 3 units in A power plant at present, and capacity is 1 × 225+2
×670MW。
It is bright according to recent national prevention and control of air pollution action plan publication and fired power generating unit construction situation of keeping under strict control, A municipal government
Do not allow newly-built Thermal generation unit on true principles of identifying in region；According to the heat supply ad hoc planning that new district is given an written reply, new district will be filled
Divide using the heat capacity after A repowering, meets its heat supply, steam supply demand as main force's heat source in region.A power plant
Long-term planning is adjusted, and the #3 unit shut down in the original plan considers to carry out #3 unit comprehensive upgrading in the recent period, and maintains to transport
Row, to meet heat supply needs in national energy conservation and emission reduction and region.
Power grid needs are accessed to meet the #3 unit shut down in the original plan, and reserve grid-connected conditions for subsequent Construction of Unit, most
Meet A utility grid safety and stability power supply needs eventually.According to newest power plant, power network development situation, 220kV new liter is created in A power plant
Pressure station, by the standby change of the backup power source #02 high of power plant's #3, #5, #6 unit and 6 times all 220kV outlets and #3 unit, #5, #
The backup power source #03 high of 6 units is standby the equipment such as to become by the old booster stations reconfiguration of 220kV into the new booster stations of 220kV.
As seen from Figure 1: the standby change of #02 high, the standby change of #03 high, comprehensive become of #1 are 220kV grade transformer, and access 220kV
New booster stations bus.
It is limited by plant site, the site of newly boosting A power plant 220kV is selected near 220kV route outlet portal frame, and #02
It is high standby become, #03 high it is standby become, the comprehensive displacement of #1 is in old factory, about 1.5 kilometers of the new booster stations of distance 220kV.
Therefore it brings a series of problem: standby change, the comprehensive displacement of #1 being opened due to the standby change of #02 high, 03 and newly boosted from 220kV
It stands about 1.5 kilometers, brings very burden apart from the too far protection scheme design to the above main equipment, initially consider to follow conventional lines
Protection scheme, it may be assumed that high and low pressure side electric current, voltage circuit, the closing loop of transformer are connected using conventional secondary cable, because
Apart from too far, the CT secondary cable distance of opposite side, load is big, causes CT C-V characteristic abnormal, causes CT capacity type selecting difficult,
To cause differential protection may malfunction, and secondary closing loop is too long causes anti-super-pressure and thunder and lightning, electromagnetic interference difficult,
There are hidden danger and accidentally conjunctions, false tripping risk resulting from for secondary cable insulation.
Being opened with #02 standby become example and is stated.
As shown in Fig. 2, utilizing GPF (General Protection False scheme:
Relaying configuration are as follows: 220kV tranformer protection and 220kV bus protection form cross protection, by high voltage side of transformer
The 1.5 kilometers of high-tension cables switched to 220kV GIS are included in the range of transformer differential protection.
Problem: because of the CT secondary cable distance apart from too far opposite side, load is big, causes CT C-V characteristic abnormal, makes
It is difficult at CT capacity type selecting, thus cause differential protection may malfunction, and secondary closing loop it is too long cause anti-super-pressure with
Thunder and lightning, electromagnetic interference are difficult, and there are hidden danger and accidentally conjunctions, false tripping risk resulting from for secondary cable insulation.
Solution: it is opened as shown in figure 3, increasing 220kV optical-fiber longitudinal difference protection as high voltage side of transformer to 220kV GIS
The main protection of 1.5 kilometers of high-tension cables between pass substitutes conventional transformer differential protection as transformer and 1.5 kilometers of high pressures
The scheme of the main protection of cable, the range of transformer differential protection are high voltage side of transformer casing and low-pressure side.
Utilize unsuccessful reason and protection after " remote to jump " function realization tranformer protection movement in 220kV optical-fiber longitudinal difference protection
Tripping utilizes the failure that failure protection is given after " teletransmission " the function realization tranformer protection movement in 220kV optical-fiber longitudinal difference protection
The transfer trip for pressing off lock and realizing non-ionizing energy loss is demultiplexed, the electrical quantity transmission of conventional secondary cable is substituted.
Relaying configuration: it is high as 220kV transformer that 220kV new booster stations side protection room increases 220kV optical-fiber longitudinal difference protection
Press side to the short leg main protection of the 220kV GIS 1.5 kilometers of high-tension cables switched, protection zone shape with 220kV bus protection
At cross protection.Transformer side is arranged in-situ protection cell and configures 220kV optical-fiber longitudinal difference protection as stub protection and power transformation
Optical fiber of standing longitudinal difference protection cooperates each other, while forming cross protection with transformer differential protection.
Since optical fiber directlys adopt fibre core communication, other links are eliminated, anti-electric signal interference performance is prominent, and failure is general
Rate is low, and optical-fibre channel has connection simple and convenient, general more stable, not labile superiority, light after debugging successfully
When fine Sustainable use optical-fibre channel carries out data exchange, two sides current data, while also alteration switch amount information are not only exchanged, it is real
Existing some miscellaneous functions, wherein just including remote jump, transporting function.It is preferred that with the auspicious relay protection PCS-931L optical fiber differential protective in south.
When protective device samples to obtain remote tripping and enters for high level, by handling and confirming, as switching value, together with electric current
(i.e. Cyclic Redundancy Check cyclic redundancy check, transmitting terminal mathematically produce for sampled data and cyclic redundancy check
It is issued after information code bit with information after raw CRC code, receiving end also generates a CRC code with same method, by this
Two check codes are compared, if it is errorless unanimously to turn out transmitted breath, if inconsistent mean that in transmission there is mistake, i.e.,
Make have a byte difference, generated CRC code is also different) etc. be packaged as a complete frame information together, by digital channel,
Send opposite side protective device to.Opposite side device often receives a frame information, will extract remote jump signal by CRC check, decoding,
And only continuously opposite side is received three times far jump signal and just think that the remote jump signal received is reliable.When protection control word adjusting
When controlling far to jump without local boot, then remote unconditional three-phase tripping outlet after jumping signal, start failure protection outlet are received, and close
Lock reclosing.When protecting control word adjusting to control for remote jump through local boot, then the starting of this side device is needed just to export.
PCS-931L jumps 1, remote jump 2 transfer trips and open into and configuring that receipts are remote to jump 1, remote jump 2 and output node configured with remote.When
When the remote jump 1 of receipts, remote jump 2 meet exit condition, node action is accordingly outputed.
Ingress is opened in device configuration teletransmission 1, teletransmission 2, teletransmission 3.With remote jump, device is also distinguished by digital channel
Transmit teletransmission 1, teletransmission 2, teletransmission 3.Difference is after receiving opposite side remote transfer signal that the tripping for not acting on the present apparatus goes out
Mouthful, and only strictly according to the facts the ingress state of opening of opposite side device is reflected and outputs on node to corresponding.
Standby become near transformer body is opened in #02 and builds protective chamber, places tranformer protection cabinet, stub protection cabinet.
Stub protection selects PCS-931L optical difference protection, protection dual configuration configuration.
As shown in figure 4, #02 opens to become new transformer, there is high pressure GIS switch in only booster stations side, and breaker failure is protected
Shield scheme: transformer fault, tranformer protection movement (are free of non-ionizing energy loss), and the tripping outlet of tranformer protection high-pressure side is connected to
Transformer side PCS-931L distant jump circuit, opposite side PCS-931L tripping outlet high jump compress switch.Opposite side PCS-931L is far jumped simultaneously
Start failure protection outlet is connected to bus differential protection unsuccessful reason circuit.
Power transformer interior fault, tranformer protection releasing failure presses off again lock out mouth access transformer side PCS-931L teletransmission
Circuit 1, opposite side PCS-931L teletransmission collection of letters outlet 1 are connected to bus differential protection releasing failure and press off lock loop again.Short leg failure is right
The movement of side PCS-931L optical difference protection, exports straight high jump and compresses switch, failure outlet access bus differential protection unsuccessful reason circuit.
Power transformer interior fault, transformer non-electricity protection act are protected non electrical quantity (gas) and are protected through non electrical quantity device
Shield outlet is connected to transformer side PCS-931L teletransmission circuit 2, and opposite side (booster stations side) PCS-931L teletransmission collection of letters outlet 2 directly connects
Failure TJF trip(ping) circuit is not opened to high pressure GIS control box.Counter arrange for having reached non-ionizing energy loss tripping not actuating breaker failure protection is wanted
It asks.
As shown in figure 5, #02 opens the standby low-pressure side tripping outlet mode that gets higher: tranformer protection, which acts, (to be free of non electrical quantity to protect
Shield) high-pressure side tripping outlet is connected to transformer PCS-931L distant jump circuit, and opposite side (booster stations side) PCS-931L far jumps out mouth jump
High-voltage switch gear.Tranformer protection movement low-pressure side tripping outlet is directly connected to low-pressure side related switch trip(ping) circuit.Transformer side
PCS-931L optical difference protection movement outlet is connected to low-pressure side related switch trip(ping) circuit.Opposite side PCS-931L (booster stations side) equation of light
Protection act exports straight BRKR Breaker, failure outlet access bus differential protection unsuccessful reason circuit.
Using 220kV optical fiber differential protective as unique advantage possessed by the communication link of route protection, especially pair
The advantages such as electric field insulate, bandwidth and attenuation are low utilize " remote to jump " function in 220kV optical fiber differential protective to realize that transformer is protected
Unsuccessful reason and trip protection after shield movement utilize " teletransmission " function in 220kV optical fiber differential protective to realize tranformer protection
Failure after movement to failure protection demultiplexes the transfer trip for pressing off lock and realizing non-ionizing energy loss.
Very good solution A factory becomes since #02 high is standby, 03 opens standby change, the comprehensive displacement of #1 from the new booster stations of 220kV about 1.5
Kilometer follows conventional lines the difficulty that the implementation of protection scheme encountered apart from too far to the above main equipment；It avoids because apart from too
Far, the CT secondary cable distance of opposite side, load is big, causes CT C-V characteristic abnormal, causes CT capacity type selecting difficult, to make
It may malfunction at differential protection；Avoid that closing loop is too long to cause anti-super-pressure and thunder and lightning, electromagnetic interference difficult, secondary electricity
There are hidden danger and the risks of accidentally conjunction resulting from, false tripping for cable insulation.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (6)
1. a kind of guard method of the 220kV grade transformer for substation's remote power-feeding, it is characterized in that: by optical-fiber longitudinal difference
Protect the short leg main protection of the long range high-tension cable switched as 220kV high voltage side of transformer to GIS, optical-fiber longitudinal difference protection
Device infield is transforming plant protecting room, forms cross protection with the protection zone of substation bus bar protection；Transformer side setting
In-situ protection cell configuration optical-fiber longitudinal difference protection cooperates each other as stub protection and transformer substation side optical-fiber longitudinal difference protection, simultaneously
Cross protection is formed with transformer differential protection；For the 220kV grade transformer configuration transformer of substation's remote power-feeding
Protection and stub protection, tranformer protection and stub protection duplicate system retrofit；
Utilize unsuccessful reason and trip protection high-pressure side after the remote jump function progress tranformer protection movement in optical-fiber longitudinal difference protection
GIS switch operation；
It is demultiplexed and is pressed off using the failure after the transporting function realization tranformer protection movement in optical-fiber longitudinal difference protection to failure protection
Lock and the transfer trip for realizing non-ionizing energy loss.
2. a kind of guard method of the 220kV grade transformer for substation's remote power-feeding as described in claim 1,
Be characterized in: the range of the transformer differential protection is high voltage side of transformer casing and low-pressure side.
3. a kind of guard method of the 220kV grade transformer for substation's remote power-feeding as described in claim 1,
Be characterized in: the 220kV grade transformer of substation's remote power-feeding breaks because the high pressure GIS switch of power supply is mounted on transformer substation side
Road device failure protection scheme: transformer fault, tranformer protection movement, the tripping outlet of tranformer protection high-pressure side are connected to transformer
Optical fiber longitudinal difference protection distant jump circuit, optical-fiber longitudinal difference protection tripping outlet high jump in opposite side compresses switch, while opposite side optical-fiber longitudinal difference is protected
The remote start failure protection outlet of jumping of shield is connected to bus differential protecting unsuccessful reason circuit.
4. a kind of guard method of the 220kV grade transformer for substation's remote power-feeding as described in claim 1,
Be characterized in: when power transformer interior fault, tranformer protection releasing failure presses off again lock out mouth access transformer side optical-fiber longitudinal difference guarantor
" teletransmission " circuit is protected, opposite side optical-fiber longitudinal difference protection teletransmission, which collects mail to export to be connected to bus differential protecting and release failure and press off again, locks back
Road.
5. a kind of guard method of the 220kV grade transformer for substation's remote power-feeding as described in claim 1,
Be characterized in: when short leg failure, optical-fiber longitudinal difference protection movement in opposite side exports straight high jump and compresses switch, and access bus in failure outlet is poor
Dynamic protection unsuccessful reason circuit.
6. a kind of guard method of the 220kV grade transformer for substation's remote power-feeding as described in claim 1,
Be characterized in: non-ionizing energy loss is connected to transformer side through non-electricity protecting device protection exit by transformer non-electricity protection act
Second teletransmission circuit of optical-fiber longitudinal difference protection, the second teletransmission of longitudinal difference protection of booster stations optical fiber, which collects mail to export, is directly connected to high pressure
GIS control box does not open failure TJF trip(ping) circuit, has reached the countermeasure of non-ionizing energy loss tripping not actuating breaker failure protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610739279.4A CN106300262B (en) | 2016-08-26 | 2016-08-26 | A kind of 220kV grade transformer protection method for substation's remote power-feeding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610739279.4A CN106300262B (en) | 2016-08-26 | 2016-08-26 | A kind of 220kV grade transformer protection method for substation's remote power-feeding |
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| CN106300262A CN106300262A (en) | 2017-01-04 |
| CN106300262B true CN106300262B (en) | 2019-02-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086552B (en) * | 2017-06-21 | 2020-02-07 | 四川电力设计咨询有限责任公司 | Protection circuit of extended cell wiring system |
| CN107769162B (en) * | 2017-11-22 | 2024-06-25 | 国网新疆电力有限公司电力科学研究院 | Unit protection tripping device of power plant based on 3/2 connection condition |
| CN108680819A (en) * | 2018-05-24 | 2018-10-19 | 国网河南省电力公司检修公司 | A kind of change of current becomes protection exit circuit and matrix test method |
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