CN103457188A - Power utilization design optimizing method for substation - Google Patents
Power utilization design optimizing method for substation Download PDFInfo
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- CN103457188A CN103457188A CN 201210175104 CN201210175104A CN103457188A CN 103457188 A CN103457188 A CN 103457188A CN 201210175104 CN201210175104 CN 201210175104 CN 201210175104 A CN201210175104 A CN 201210175104A CN 103457188 A CN103457188 A CN 103457188A
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Abstract
A power utilization design optimizing method for a substation aims to modify wiring of substation transformers, power supply manners of substation power utilization load, device type selection, and the like. Wiring options of substation transformers, power supply manners of substation power utilization load, substation transformer selection and low-voltage apparatus selection are modified. Substation electric system design is quite important in electric design of the substation, substation electric system design must execute technological and economical policies of China and actively and carefully uses new technology and equipment which pass operation tests and technical evaluation so as to allow the design to accord to the principles of safety, reliability, advancing technology, economy, practicality, and consistency with national circumstances.
Description
Technical field
The present invention relates to transformer station, especially the optimization of 220KV Substation Station electrical design.
Background technology
In the electrical design of transformer station, the design of station power use system is a very part and parcel.The electrical design of standing must be carried out national techno-economic policy, actively cautiously adopts through Operation trial with by new technology, the new equipment of technical appraisement, makes design meet safe and reliable, advanced technology, economic and practical, the principle that meets national conditions.
In electric power system, the station of 220 kV transformer stations is substantially gone up and is all adopted Y with transformer, the wiring of yn12.But, stipulated that in existing " thermal power plant station service designing technique regulation " the subdistribution transformer depressor should select D, the yn11 wiring.To three-phase oil immersion and dry type D, the yn11 wiring transformer has proposed requirement to industry standard JB 2426-92 " the personal three-phase transformer technical parameter of power plant and electric substation and requirement ".Simultaneously, low-loss, oil-immersed type transformer (S9) and the resin filled type dry-type transformer of the manufacturer of Domestic Transformers, all have Y at present, yn12 and D, and two kinds of modes of connection of ynll are selected for the user.
By zone, the loop feeding network is set respectively general employing of the supply power mode of 220 kV Substation Station electricity consumption important loads, and in the middle of looped network, a secondary knife switch is set and moves with open loop.But also there is following problem in this mode under service conditions at present.
(1), in the electrical design technical regulation of station, station electricity consumption source automatic feeding device should not be set between two sections working bus bars of clear.And District of Shanghai 220 kV transformer stations are progressively carrying out unwatched pattern at present.Therefore, when a certain time important load breaks down dead electricity, half ring of (as the low-tension supply cable fault) annular electric supply network, by dead electricity, now, can only rely on the operations staff to be on the scene, and the switch cutter of use of unlinking that closes, to guarantee to continue power supply.
When (2) 220 kV transformer station two stations do not meet the parallel running condition with transformer, should strictly limit the station parallel operation of transformers, and unlinking of ring network supply power mode likely there will be mistake to close phenomenon with knife switch, cause two stations to move with transformers connected in parallel.
Low-loss oil-immersed type transformer is all selected by the transformer major part in station in 220 kV alternating current stations, each department.But, along with 220 kV transformer stations constantly enter urban district, transformer station combines with civil buildings and underground substation etc., the requirement of its fire-fighting is very high, and often arrangement condition is restricted.And environmental protection is very tight to the noise requirements of transformer station.These conditions all propose requirements at the higher level to station with the selection of transformer.
In the electrical network of various places, the station power use system adopted is that basic symbols is closed and stated principle.But, along with the progress in epoch, constantly the weeding out the old and bring forth the new of new equipment new technology, in original station power use system design, as the wiring of station with transformer, the supply power mode of the power load of standing, the aspects such as the type selecting of equipment all exist and remain improvements.
Summary of the invention
In order to make the wiring of station with transformer, the supply power mode of the power load of standing, the aspects such as the type selecting of equipment are improved, and the invention provides the optimization with a kind of Substation Station electrical design.
The technical solution adopted for the present invention to solve the technical problems is: to the supply power mode optimization of the wiring of transformer selection for station, the power load of standing, stand and improved with the selection of transformer, the selection of low-voltage electrical apparatus.
Stand and should select D with transformer, the yn11 wiring, its D, the yn11 wiring transformer has following advantage: (1) can take full advantage of the transformer rated capacity; (2) greatly reduce zero sequence resistance hole; (3) provide triple harmonic current or zero-sequence current path.
The supply power mode of transformer station's important load should adopt by zone special distribution box is set respectively, to each interval load radiation type electric supply mode, and the one tunnel operation of distribution box electric power incoming line, a road is standby, and stand-by power supply is set from cutting apparatus between the two-way incoming power.This just can give full play to two circuit standby functions each other, and affected scope in the time of also can dwindling the power circuit fault can guarantee reliability and the flexibility of power supply.The ring network power supply mode that this supply power mode is more habitual slightly increases in equipment (distribution box) investment.
Should adopt dry type station transformer in urban district or indoor 220 kV transformer stations, these dry-type transformers have the advantages such as volume is little, and fire resistance is good, and without oiling, loss is low, and noise is little, and maintenance workload is little.Although its price is high than oil-filled transformer, can meet well necessary requirement.
At first the selection of low-voltage electrical apparatus should meet the requirement of voltage, operating current, breaking capacity, dynamic and thermal stability and surrounding environment.The electricity consumption low-pressure system of standing is generally all selected complete low-voltage cabinet, many multiloop electric equipments, and intensive sealing safety, when the screen cabinet is inner, the temperature rise impact between loop is arranged, and the equipment cooling condition is poor again.For this reason, for the selection that is closed in the electric equipment rated current of screen in cabinet, should consider suitable nargin, generally can be multiplied by 0.7～0.9 nargin coefficient by the electrical equipment rated current and be revised.
Embodiment
1, can take full advantage of the transformer rated capacity
D, the ynll wiring transformer can take full advantage of the transformer rated capacity.To Y, the yn12 transformer, when Three-Phase Transformer is load unbalanced, the neutral linear flow of secondary side.; L; The electric current that mm crosses is that the zero sequence magnetic flux that 3Io is produced by zero-sequence current forms magnetic hysteresis and eddy current loss through fuel tank and ironware, makes the transformer heating.And, the clears such as transformer operating standard its neutral current must not be greater than 25% of secondary side rated current.
For D, the ynll wiring transformer, because zero-sequence current all can cancel out each other the zero sequence magnetic flux in primary side and secondary side circulation, can avoid above-mentioned heating situation, and transformer can single-phase full capacity operation (33.3% Un).
2, greatly reduce zero sequence resistance hole
D; the zero sequence impedance of ynll wiring transformer reduces greatly; its value approximately equates with its positive sequence impedance; single-phase short circuit current is increased; dwindled the difference with the three-phase shortcircuit electric current, the sensitivity of protection equipment when this can directly improve single-phase short circuit, simultaneously; also help protection equipment and coordinate with the selection in feeder cable cross section, simplified protected mode.
3, provide triple harmonic current or zero-sequence current path
D, the triangle winding of ynll wiring transformer provides path for triple harmonic current or zero-sequence current.In addition, when the low-pressure side three-phase load is uneven, the transformation of this wiring is clamored and not there will be the floating displacement of low-pressure side neutral point, thereby has guaranteed the supply power voltage quality.
Claims (5)
1. the optimization method of a Substation Station electrical design is characterized in that: to the supply power mode optimization of the wiring selection of transformer for station, the power load of standing, stand and improved with the selection of transformer, the selection of low-voltage electrical apparatus.
2. the optimization method of a kind of Substation Station electrical design according to claim 1, is characterized in that, stands and should select D with transformer, the yn11 wiring.
3. the optimization method of a kind of Substation Station electrical design according to claim 1, it is characterized in that, the supply power mode of transformer station's important load should adopt by zone special distribution box is set respectively, to each interval load radiation type electric supply mode, the one tunnel operation of distribution box electric power incoming line, one tunnel is standby, and stand-by power supply is set from cutting apparatus between the two-way incoming power.
4. the optimization method of a kind of Substation Station electrical design according to claim 1, is characterized in that, in urban district or indoor 220 kV transformer stations, should adopt dry type station transformer.
5. the optimization method of a kind of Substation Station electrical design according to claim 1, it is characterized in that, the electricity consumption low-pressure system of standing is generally all selected complete low-voltage cabinet, and for the selection that is closed in the electric equipment rated current in the screen cabinet, should consider suitable nargin, generally can be multiplied by 0.7～0.9 nargin coefficient by the electrical equipment rated current and be revised.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210175104 CN103457188A (en) | 2012-05-31 | 2012-05-31 | Power utilization design optimizing method for substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210175104 CN103457188A (en) | 2012-05-31 | 2012-05-31 | Power utilization design optimizing method for substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103457188A true CN103457188A (en) | 2013-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210175104 Withdrawn CN103457188A (en) | 2012-05-31 | 2012-05-31 | Power utilization design optimizing method for substation |
Country Status (1)
| Country | Link |
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| CN (1) | CN103457188A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108701497A (en) * | 2015-12-17 | 2018-10-23 | 纽斯高动力有限责任公司 | Multimode power equipment with off-network power supply |
| CN110233442A (en) * | 2019-05-30 | 2019-09-13 | 武汉明心电力科技有限公司 | A method of based on life cycle management Substation Design |
-
2012
- 2012-05-31 CN CN 201210175104 patent/CN103457188A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108701497A (en) * | 2015-12-17 | 2018-10-23 | 纽斯高动力有限责任公司 | Multimode power equipment with off-network power supply |
| CN108701497B (en) * | 2015-12-17 | 2022-06-24 | 纽斯高动力有限责任公司 | Multi-modular power equipment with off-grid power supply |
| CN110233442A (en) * | 2019-05-30 | 2019-09-13 | 武汉明心电力科技有限公司 | A method of based on life cycle management Substation Design |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20131218 |