CN107462802A - A kind of 500kV underground substations earthed system state evaluating method - Google Patents
A kind of 500kV underground substations earthed system state evaluating method Download PDFInfo
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- CN107462802A CN107462802A CN201710712025.8A CN201710712025A CN107462802A CN 107462802 A CN107462802 A CN 107462802A CN 201710712025 A CN201710712025 A CN 201710712025A CN 107462802 A CN107462802 A CN 107462802A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The present invention relates to a kind of 500kV underground substations earthed system state evaluating method, comprise the following steps：1) determine the index of 500kV underground substations earthed system state estimation, including contact and step voltage value, conductor heat endurance, ground network ground resistance, software safety and underground pile foundation thermostabilization security；2) 500kV underground substations earthed system is simulated, obtains the evaluation of estimate of indices respectively；3) by the evaluation of estimate of indices compared with secure threshold, the system mode of 500kV underground substations earthed system is finally given.Compared with prior art, the present invention is wide in terms of having the advantages that suitable for 500kV underground substations, consideration.
Description
Technical field
The present invention relates to more particularly, to a kind of 500kV underground substations earthed system state evaluating method.
Background technology
With developing rapidly for social economy, all trades and professions are all constantly increasing to the demand of electric power, Shanghai Urban center
Area's power load more crypto set.In order to ensure the safe and reliable electricity consumption in downtown area, properly settle such regional land used it is nervous,
The siting of station is difficult, soil is expensive, the costly Construction Problems brought of earth clearance, is integrally required with reference to area planning, is
Land utilization ratio is improved, improves urban landscape, Optimizing City environment, underground substation is arisen at the historic moment.With traditional transformer station's phase
Than city underground station is compared with common City Substation：Underground substation floor space is larger, and pile foundation is more, and short circuit current is big；
Underground substation inlet-outlet line typically uses cable, when short trouble occurs, strong sensing between cable core and sheath be present, so as to
Influence the distribution of fault current；Underground substation typically uses GIS, and the intense electromagnetic between phase line and metal shell, which senses, to be caused
The Potential distribution of GIS metal shells is extremely uneven, great potential difference between GIS diverse locations be present, must consider to ensure that GIS connects
Touch voltage security；City underground substation coexists with commercial, civil buildings, and its earthed system is directly or indirectly with pipeline or building
Build thing earthed system and electrical connection be present, all coexist between facility is built influences each other.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of power transformation of 500kV undergrounds
Earthed system of standing state evaluating method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of 500kV underground substations earthed system state evaluating method, comprises the following steps：
1) index of 500kV underground substations earthed system state estimation, including contact and step voltage value, conductor are determined
Heat endurance, ground network ground resistance, software safety and underground pile foundation thermostabilization security；
2) 500kV underground substations earthed system is simulated, obtains the evaluation of estimate of indices respectively；
3) by the evaluation of estimate of indices compared with secure threshold, 500kV underground substations earthed system is finally given
System mode.
Described step 2) specifically includes following steps：
Apparent resistivity, soil texture, grounded screen and the electric power of electrical equivalent of 500kV underground substations are obtained respectively
Network architecture parameters, underground System in Substation is simulated using CDEGS softwares, obtain the evaluation of indices respectively
Value.
In described step 2), the polylith soil model of structure 500kV underground substations multilayer floor intermediate air, use
Symmetrical quadrupole resistivity soun ding obtains the soil resistivity of 500kV underground substations, including large electrode spacing resistivity and noncontinuous electrode
Spacing resistivity, the ground potential liter of earthed system is obtained using large electrode spacing resistivity, is obtained using noncontinuous electrode spacing resistivity
Take contact and step voltage value.
In described step 2), the grounded screen threedimensional model of structure 500kV underground substations, including outdoor grounded screen,
Lower ground connection main line, main grounding grid and GIS submodels, and obtain mesh grounding after adding underground pile foundation on grounded screen threedimensional model
Resistance value, there is position for the switch and the short trouble of main transformer around breaker, GIS in simulated failure, and obtains correspondingly
Earth mat potential rise, the ground potential of trouble point rise and contact and step voltage.
In described step 2), according to the network topology structure of 500kV underground substations and line parameter circuit value with building 500kV
The cable shunting equivalent network of lower transformer station, obtains the failure electricity when there is three phase short circuit fault and single-phase grounding fault
Flow valuve.
In described step 2), according to the types of conductors of 500kV underground substations, maximum trouble duration, conductor chi
Very little and frequency acquisition current capacity, to evaluate conductor heat endurance.
In described step 2), according to 500kV underground substations under 220kV fault conditions, it is maximum to flow through underground pile foundation
Electric current, pile foundation reinforcing bar minimum diameter and maximum trouble duration obtain the maximum temperature rise of underground pile foundation, and underground pile is evaluated with this
Base thermostabilization security.
Compared with prior art, the present invention has advantages below：
First, suitable for 500kV underground substations：Do not become in existing transformer station's evaluation method for 500kV undergrounds
The method that the earthed system in power station carries out state estimation, the present invention have filled up this blank.
2nd, it is wide in terms of consideration：The present invention respectively from contact and step voltage value, conductor heat endurance, ground network ground resistance,
The many aspects such as ground software safety and underground pile foundation thermostabilization security carry out shape to the earthed system of 500kV underground substations
State is assessed, and the systematic parameter under fault condition is obtained by analog simulation, conveniently can accurately draw 500kV underground substations
Earthed system state.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
Illustrated below by taking the Hong Yang transformer stations of Shanghai City as an example：
To the east of the Yixian road of rainbow poplar substation site selection Yangpu District, to the west of text garden district, on the south three social connections, Zheng Li roads with
North, close in the range of the land used of three social connections.Hong Yang transformer stations are designed using F3/B3, design 25 meters of buried depth, substation planning
24570 square metres of usable floor area.
Rainbow poplar transforming plant main transformer capacity current period 2 × 1500MVA, 3 × 1500MVA of long term.Mainly with 500kV/220kV/
Tri- voltage class of 66kV are formed, and use is single-phase, self coupling, off circuit tap changing transfor mer, and transformer neutral point is directly grounded.Electrically
Main Wire Connection Scheme is as follows：500kV uses the line-transformer-connection mode of breaker；220kV buses are divided using double-bus three
The mode of connection of section, current period are double female double segmentations；66kV buses use the single bus scheme using main transformer as unit, if total open circuit
Device.
Rainbow poplar station access scheme is as follows：
500kV schemes
The 500kV rainbows poplar station current period is accessed using line-transformer-connection mode by 2 times 500kV ground wires cable runs
500kV poplar rows station.There is certain uncertainty in the 3rd loop line direction at a specified future date, specific to be determined regarding power network development situation from now on.
220kV schemes
Current period 220kV outlet 14 is returned, to steel, the people and, each 1 time of Xin Jiang gulfs, to Yun Zaobang, Yixian, political affairs are vertical, Jing'an
(220kV contacts line) is each 2 times, is returned to Wujiao Court 3.220kV outlets 21 at a specified future date are returned, because planning and preliminary design situation have certain change
Change, it is also not final at present to determine.
All inlet-outlet lines in rainbow poplar station are cable run, and 500kV is that tunnel is laid, and 220kV is that comb or tunnel are laid.
Tunnel is laid, center buried depth about 7.5m, comb laying, about 1.5 meters of center buried depth.
Rainbow poplar war device miniaturization, convenience in transport lifting；Floor space is small, to reduce the floor space of transformer station as far as possible,
Ensure recommendation requirement of the transformer station to peripheral facility particularly house, 500kV, 220kV, 66kV power distribution equipment use for this
GIS device.
The particular content of the present invention includes：
1st, the measurement data based on site Soils In The Region resistivity carries out the analysis and explanation of soil texture.
2nd, based on underground 500kV Hong Yang transformer stations inlet-outlet line cable and overhead transmission line data, single-phase situation over the ground is established
Fault current distribution computation model, it is determined that entering the maximum earth current on ground by grounded screen.
3rd, the foundation of underground substation grounded screen threedimensional model, based on underground 500kV rainbow poplar System in Substation structure,
Size and material establish three-dimensional earthed system Simulation Calculation.
4th, the security evaluation of System in Substation is carried out, determines grounding resistance, contact voltage, step voltage, earth's surface electricity
The parameters such as the GPR of position and earth conductor.Sensing between cable conductor and sheath and different faults position are considered in analysis
Influence.
Underground substation floor space is larger, and pile foundation is more, and transformer station is F3/B3 structure, in order to correct, accurate
The characteristics of really considering underground large-scale substation earthed system, the method and software of use allow for simulating underground space layer
And the soil model of periphery arbitrary dimension.
The present invention calculating application CDEGS software kits and draw.CDEGS can calculate by bury or ground on it is powered
Electric current and electromagnetic field of the arbitrary network of conductor composition under the transient conditions such as normal, failure, thunderbolt.CDEGS can be simulated simply
Conductor and combined conductor, such as bare wire, cated pipeline or the pipe dress cable system being embedded in complicated soil structure.
CDEGS can be provided from simple ground grid design, consider that complexity senses burying system or the ground system by initiations such as thunderbolts
The solution of the complex state of system.CDEGS is current energy any soil model of accurate simulation unique in the world, so as to accurately count
Calculate complicated System in Substation and assess the Software tool of its security performance.
Earth current calculates and Analysis of Grounding and an importance in design.Ignore earth current calculating, short
Road total current is a kind of very conservative hypothesis as earth current.This can cause the significant wastage in ground grid design.Sometimes
Diverting coefficient can be used to determine earth current.In this case, the selection of correct diverting coefficient is extremely difficult, because
It is many to influence the factor of diverting coefficient.Using Right-of-Way modules in CDEGS software kits, can highly precisely calculate
Include the earth current of any circuit.
The analysis of earthed system mainly includes calculating grounding resistance, potential rise, touch voltage and step voltage.It is common to connect
The hypothesis that it is an equipotential body based on grounded screen that ground analysis, which is,.This assume small grounded screen, high soil resistivity and circulation compared with
It is to set up in the case of small.And in the case of big grounded screen (such as Large Underground transformer station), low-resistivity or big circulation
It is then invalid.If the material of grounded screen is steel rather than copper, this problem is just more prominent.In addition, when faulty in circuit
When electric current flows through, aerial earth wire, the electricity of an opposite direction can be sensed in buried cable sheath or ground wire or GIL pipe shell
Stream.The outflow of the electric current reduces the electric current that the earth is flowed into by earth mat.Do not consider that this portion of electrical current can cause mistake in design
Conclusion.The present invention uses the MALZ in CDEGS software kits, highly precisely simulates these situations.Simultaneously can be according to scene
The complicated soil texture of actual conditions simulation, correctly, accurately takes into account the characteristics of underground large-scale substation earthed system, simulates
The polylith soil model of underground space layer and periphery multi-layer Soil model, so as to farthest press close to the actual feelings in scene
Condition.Finally, due to more voltage levels, it is greatly circulation that the fault current of Large Underground transformer station, which has, must in calculating
Must consider circulation over the ground software safety can influence.The flow for calculating design is as shown in Figure 1.
First, soil surveying data and model determine：
Soil resistivity measurement forms the basis of any ground connection research, same earthed system table in different soil models
Reveal entirely different electrical characteristic.Therefore this item purpose primary work is exactly to carry out soil resistivity measurement, it is determined that electrically etc.
The soil texture of effect.In general, the ground potential liter (GPR) of earthed system, which depends mainly on deep soil, (corresponds to large electrode
Spacing resistivity measurements)；And contact and step voltage then depend on local topsoil spy as the percentage that ground potential rises
Property (corresponding to noncontinuous electrode spacing resistivity measurements).
16 point position measurements are completed in the soil resistivity measurement of Hong Yang transformer stations altogether, using weight WDDS-1 type digital resistances
Rate measuring instrument, measured with reference to conventional symmetric quadrupole resistivity soun ding, the Soil Surrounding model of rainbow poplar underground substation uses rainbow
Four layers of soil model of poplar 500kV transformer stations soil resistivity test.
2nd, the emulation of rainbow poplar station earthed system and impedance ground calculate
Rainbow poplar substation grounding network is mainly made up of 6 parts：One layer of outdoor grounded screen, B1 ground connection main line,
Two layers of underground ground connection main line, the GIS of F3/B3 ground connection main line, main grounding grid and 2 voltage class.The power transformation being provided with
Stand earth mat and GIS models are all two dimensional surfaces.Researcher accurately establishes according to existing two dimensional model and data, success
Whole transformer station grounded screen and GIS and its proprietary ground networks and the element of had an impact earth mat security performance, this is complete, huge
Threedimensional model be used for calculate substation grounding impedance, each position potential rise, contact and step voltage etc., so as to for assess ground
The security performance of net.
Hong Yang transformer stations main grounding grid size is 148.2m × 68.4m, and grid 8m × 8m, 25.6m located underground, four turn
It is circular arc at angle, plurality of positions is disposed with the drop bar that length is 10.5 meters.Horizontal conductor is 150mm2Copper stranded conductor, equivalent half
Footpath is 6.9mm, and its relative resistivities (to copper) is 1, and relative permeability (to air) is 1.Ground connection bar material is copper covered steel, relatively
Resistivity (to copper) 12, relative permeability (to air) 250, radius 7.1mm.
Underground substation floor space is larger, and pile foundation is more, and how this section influences underground substation security performance to pile foundation
Influence perform an analysis calculating research, so as to pile foundation replace main earth mat possibility make Primary Study.
Pile foundation simulation is more than totally 600 reinforcing bar, is divided into five type P1, P2, P3, P4 and P5.Wherein P1, P2, P3 and P4
The stake adverse construction method stage is used as stand column pile, and uplift pile, stake footpath Φ 1000,56.1 meters of designing pile length tail, stake are used as under anti-floating operating mode
Steel core concrete column built in top.Uplift pile under the anti-floating operating mode of P5 stakes position, stake footpath Φ 800, designing pile length are 45 meters.P1、P2、P3、
P4 and P5 connects in succession in diverse location and horizontal earth mat, B1, two layers, three layers of cement steel and main earth mat.
Drop to 0.0714ohm from original 0.083ohm during the grounding resistance consideration pile foundation of power station, decline 14% (under definition
Drop rate C=(RWithout pile foundation-RThere is pile foundation)/RWithout pile foundation* 100%).It can be seen that：Huge pile foundation has obvious to underground station ground connection performance
Influence.
3rd, power station maximum enters the calculating and analysis of ground short circuit electric current
Earth current calculates and Analysis of Grounding and an importance in design.Ignore earth current calculating, short
Road total current is a kind of very conservative it is assumed that this can cause the significant wastage in ground grid design as earth current.Some
Designer can determine earth current value based on typical diverting coefficient, it is envisaged that such typical data is difficult to be adapted to each grind
The power station studied carefully, obtained result are very rough reluctantly.If in addition, it is also very difficult actually to measure diverting coefficient.Many institute's weeks
Know, for the network system containing cable, to determine that correct diverting coefficient is even more extremely difficult, because influenceing diverting coefficient
Factor is a lot, and cable cover(ing) causes a large amount of electric currents to return to distal end power station by sheath the strong sensing cable core.By means of instrument
Software cd EGS can be simulated including each power network such as transformer in earth mat, ground wire, shaft tower, tower grounding system, cable and station
Network component, each element is accurate to, and then calculates fault current distribution, determine earth current and ground wire, the backflow of sheath.
Hong Yang transformer stations inlet-outlet line cable is each remote all using cable metal sheath cross-connect both ends direct grounding way
The grounding resistance of System in Substation is held by 0.5 ohm of consideration.
The method of operation of the calculating of Hong Yang transformer stations diverting coefficient depending on topological network, based on Shanghai Electric Power economic research
The data that institute provides.When single-phase fault to ground occurs for Hong Yang transformer stations 500kV or 220kV buses, only poplar row station provides
Short circuit current, the circulation of transformer neutral point can be neglected, and not consider circulation, i.e. electric current clicks and enters ground by abort situation one,
In the case of, the safety index (touch voltage and step voltage) of earthed system and the size of earth current are directly proportional, thus, only
(fault current 45.5kA) electricity for entering ground by earthed system need to be calculated in the case of rainbow poplar stands the single-phase fault to ground of 220kV buses
Stream.
When faulty electric current flows through in circuit, the electric current of an opposite direction is had in aerial earth wire or cable cover(ing).
The outflow of the electric current reduces the electric current that the earth is flowed into by earth mat.This portion of electrical current and neutral point of main transformer are not considered in design
Backflow can cause the conclusion of mistake.Similarly, ignore earth current calculating, using short-circuit total current as earth current be one kind very
It is conservative it is assumed that this can cause the significant wastage in ground grid design.Some designers can be determined based on typical diverting coefficient into
Earth-current value, it is envisaged that such typical data is difficult the power station for being adapted to each study, and obtained result is very thick reluctantly
Slightly.If in addition, it is also very difficult actually to measure diverting coefficient.
For the network system containing cable, to determine that correct diverting coefficient is even more extremely difficult, because influenceing shunting
The factor of coefficient is a lot, and cable cover(ing) causes a large amount of electric currents to return to distal end power station by sheath the strong sensing cable core.By
It can be simulated in tool software CDEGS each including transformer etc. in earth mat, ground wire, shaft tower, tower grounding system, cable and station
Electric power networks component, is accurate to each element, and then calculates fault current distribution, determines earth current and ground wire, sheath
Backflow.
When calculating single-phase earthing fault situation in 220kV Hong Yang transformer stations generation station, fault current connects in Hong Yang transformer stations
The network topology model of distribution in ground system and cable cover(ing) is ROW (TRALIN/SPLITS) module using CDEGS softwares
Calculate analysis.
ROW (TRALIN/SPLITS) module is carried out by the way of circuit, i.e., asks for circuit using TRALIN module modelings
Parameter：Self-impedance, mutual impedance and shunt impedance；SPLITS modules establish the circuit model of whole topological network, based on specified
CURRENT DISTRIBUTION of the electric current in earthed system, aerial earth wire and cable cover(ing) is asked in excitation.
4th, earth mat security performance assessing
1st, contact and step voltage safety value establishing criteria GB/T 50065-2011 are calculated, as a result as shown in table 1.
The Maximum Contact of table 1 and step voltage safety value
2nd, conductor heat endurance
Rainbow poplar earth mat conductor is 150mm2Copper stranded conductor, for maximum trouble duration 0.33s, use
SESAmpacity modules calculate analysis, and electric current thermal capacity is 68.5kA (RMS).Maximum total failare electric current is 45.5kA.Therefore,
Even if assume that whole total failare electric currents flow through a conductor, such as the conductor of trouble point connection equipment or structure, 150mm2Copper
Twisted wire meets thermal capacity requirement enough.
3rd, ground network ground resistance is analyzed
Rainbow poplar System in Substation is placed in and considers transformer station between layers in four layers of polylith soil model of air,
Simulation calculating is carried out using MALZ modules, the impedance ground calculated value of underground power station earthed system is 0.083 ∠, 2.94 ° of Ω.Root
According to China《The grounding design specification of ac electric apparatus device》GB/T50065-2001 standards, earthed system impedance ground are preferably less than
2000/I Ω (I is the earth current for flowing through earthed system), rainbow poplar underground station 220kV single-phase faults, very conservative calculating bar
Under part, maximum earth current is 5.446kA, and 2/5.446=0.367 Ω, rainbow poplar underground substation grounding resistance is far smaller than will
Evaluation.
4th, earth mat security evaluation
To under different short circuit fault conditions, underground substation power network current potential, key position ground potential distribution and contact
And step voltage is calculated.Software module is grounded using MALZ in CDEGS.The position of failure is selected in breaker
(F1), GIS nearby switchs (F2), main transformer (F3), the place that these typical singlephase earth faults generally occur.Each failure
In the case of all consider circulation between trouble point and cable cover(ing) and earth mat tie point.During generation short trouble, earth current
There is larger contribution to the potential rise of whole earth mat.In order to consider the influence of circulation, in abort situation F1 or F2 or F3 injection electricity
Total failare electric current is flowed, in the electric current that each sheath and earth mat tie point injection sheath point are walked.Pay attention to, if having ignored circulation (such as
Generally conventional software, ground connection earthed system is regarded as equipotential volume), then it can draw the wrong conclusion underestimated！
To different trouble points, different voltage class calculate corresponding earth mat potential rise, ground potential liter, contact with
Step voltage.
Underground substation air layer is considered, using polylith soil model, to abort situation near breaker (F1), GIS
Switch (F2), main transformer (F3), 3 typical fault points, consider circulating current in sheath, calculate 220kV busbar short-circuits, the conservative event of maximum
Hinder under current conditions, obtain corresponding whole station earthed system ground potential liter, key position current potential, surface potential, contact and stride
Voltage's distribiuting.As shown in table 2,3 and 4, full rainbow poplar underground station earthed conductor potential rise reaches 642.64V it can be seen from result of calculation,
Highest ground potential reaches 580.29V.Maximum stride voltage is 23.27V from anywhere in full underground station personnel can go, less than striding
Voltage guards safety value 339.9V.The local Maximum Contact voltage that personnel can contact in standing is 203.21V, is protected less than contact voltage
Keep safety value 311.9V.
When single-phase earthing fault occurs for table 2, each position security evaluation result of calculation in rainbow poplar underground substation：Failure occurs
Typical circuit breaker position F1
When single-phase earthing fault occurs for table 3, each position security evaluation result of calculation in rainbow poplar underground substation：Failure occurs
Typical GIS switchs F2
When single-phase earthing fault occurs for table 4, each position security evaluation result of calculation in rainbow poplar underground substation：Failure occurs
Typical main transformer position F3
5th, underground pile foundation thermostabilization security, which calculates, assesses
According to existing national standards《Mixed mud code for structural design》GB50010-2002 provides the highest face temperature temperature of component
Degree.When building is by being struck by lightning, electric current flow through need check fatigue component lightning current be diverted to it is sufficiently small, so as to really
The heating of conductor is protected in safe range.By with state's extra large Electric Design Co., Ltd expert's cooperation and communication on the net, power current temperature
Degree influences to press thermostabilization formula, and 100 degree of pile foundation reinforcing bar temperature control is interior.The initial temperature of reinforcing bar presses 40 degree, so pile foundation steel
Muscle should be controlled within 60 degree due to being heated up caused by fault current.
Under the 220kV failures of rainbow poplar station, the maximum current that flows through pile foundation reinforcing bar is 1193A, pile foundation bar diameter (minimum)
80mm, for maximum trouble duration 0.33s, calculated and analyzed using SESAmpacity modules, the temperature rise of pile foundation rebar surface is only
0.004 degree, reinforcing bar initial temperature takes 40 °, and the maximum temperature of reinforcing bar is 40.004 degree, far smaller than 100 degree of required values, thermostabilization
Sexual satisfaction safety requirements.
Rainbow poplar underground station earth mat security performance assessing result shows that grounded screen is functional.It is emphasized that：In research
The data such as short circuit current, GIS structures and earth point, cable, which are based on typical dataset, to be guarded estimation and obtains.It is recommended that obtaining these
After data, carry out corresponding ground software safety and calculate assessment accounting, to ensure the safe operation at rainbow poplar underground station.
Claims (7)
1. a kind of 500kV underground substations earthed system state evaluating method, it is characterised in that comprise the following steps：
1) index of 500kV underground substations earthed system state estimation is determined, including contact and step voltage value, conductor heat are surely
Qualitative, ground network ground resistance, software safety and underground pile foundation thermostabilization security；
2) 500kV underground substations earthed system is simulated, obtains the evaluation of estimate of indices respectively；
3) by the evaluation of estimate of indices compared with secure threshold, the system that finally gives 500kV underground substations earthed system
State.
A kind of 2. 500kV underground substations earthed system state evaluating method according to claim 1, it is characterised in that
Described step 2) specifically includes following steps：
Apparent resistivity, soil texture, grounded screen and the electric power networks of electrical equivalent of 500kV underground substations are obtained respectively
Structural parameters, underground System in Substation is simulated using CDEGS softwares, obtain the evaluation of estimate of indices respectively.
A kind of 3. 500kV underground substations earthed system state evaluating method according to claim 2, it is characterised in that
In described step 2), the polylith soil model of structure 500kV underground substations multilayer floor intermediate air, using symmetrical quadrupole
Resistivity soun ding obtains the soil resistivity of 500kV underground substations, including large electrode spacing resistivity and noncontinuous electrode spacing resistance
Rate, using large electrode spacing resistivity obtain earthed system ground potential liter, using noncontinuous electrode spacing resistivity obtain contact and
Step voltage value.
A kind of 4. 500kV underground substations earthed system state evaluating method according to claim 3, it is characterised in that
In described step 2), the grounded screen threedimensional model of structure 500kV underground substations, including outdoor grounded screen, underground ground connection are done
Line, main grounding grid and GIS submodels, and ground network ground resistance value is obtained after adding underground pile foundation on grounded screen threedimensional model,
There is position for the switch and the short trouble of main transformer around breaker, GIS in simulated failure, and obtains corresponding trouble point
Earth mat potential rise, ground potential rise and contact and step voltage.
A kind of 5. 500kV underground substations earthed system state evaluating method according to claim 2, it is characterised in that
In described step 2), 500kV underground substations are built according to the network topology structure of 500kV underground substations and line parameter circuit value
Cable shunting equivalent network, obtain the fault curre when there is three phase short circuit fault and single-phase grounding fault.
A kind of 6. 500kV underground substations earthed system state evaluating method according to claim 2, it is characterised in that
In described step 2), according to the types of conductors of 500kV underground substations, maximum trouble duration, conductor size and frequency
Current capacity is obtained, to evaluate conductor heat endurance.
A kind of 7. 500kV underground substations earthed system state evaluating method according to claim 2, it is characterised in that
In described step 2), according to 500kV underground substations under 220kV fault conditions, underground pile foundation maximum current, pile foundation are flowed through
Reinforcing bar minimum diameter and maximum trouble duration obtain the maximum temperature rise of underground pile foundation, and underground pile foundation thermostabilization peace is evaluated with this
Quan Xing.
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| CN109188333A (en) * | 2018-09-30 | 2019-01-11 | 国网湖南省电力有限公司 | A kind of Resistance of Grounding Grids small scale test model and modification method |
| CN110082615A (en) * | 2018-01-26 | 2019-08-02 | 上海瑞奇电气设备股份有限公司 | Covered transformer temperature-raising experimental method |
| CN110412395A (en) * | 2018-12-10 | 2019-11-05 | 国网河南省电力公司电力科学研究院 | Improved grounding net of transformer substation analogue test platform and test method |
| CN111562452A (en) * | 2020-04-03 | 2020-08-21 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Thermal stability checking system for grounding device of transformer substation |
| CN112395788A (en) * | 2020-10-19 | 2021-02-23 | 国网江西省电力有限公司电力科学研究院 | Personal safety accurate evaluation method for distribution network neutral point grounding type reconstruction |
| CN112684273A (en) * | 2021-01-06 | 2021-04-20 | 国核电力规划设计研究院重庆有限公司 | Grounding current shunting method for grounding short circuit fault of 110kV full-cable outgoing substation |
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2017
- 2017-08-18 CN CN201710712025.8A patent/CN107462802B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082615A (en) * | 2018-01-26 | 2019-08-02 | 上海瑞奇电气设备股份有限公司 | Covered transformer temperature-raising experimental method |
| CN110082615B (en) * | 2018-01-26 | 2021-08-24 | 上海瑞奇电气设备股份有限公司 | Temperature rise test method for buried transformer |
| CN109188333A (en) * | 2018-09-30 | 2019-01-11 | 国网湖南省电力有限公司 | A kind of Resistance of Grounding Grids small scale test model and modification method |
| CN110412395A (en) * | 2018-12-10 | 2019-11-05 | 国网河南省电力公司电力科学研究院 | Improved grounding net of transformer substation analogue test platform and test method |
| CN111562452A (en) * | 2020-04-03 | 2020-08-21 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Thermal stability checking system for grounding device of transformer substation |
| CN111562452B (en) * | 2020-04-03 | 2022-08-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Thermal stability checking system for grounding device of transformer substation |
| CN112395788A (en) * | 2020-10-19 | 2021-02-23 | 国网江西省电力有限公司电力科学研究院 | Personal safety accurate evaluation method for distribution network neutral point grounding type reconstruction |
| CN112684273A (en) * | 2021-01-06 | 2021-04-20 | 国核电力规划设计研究院重庆有限公司 | Grounding current shunting method for grounding short circuit fault of 110kV full-cable outgoing substation |
| CN112684273B (en) * | 2021-01-06 | 2023-08-29 | 国核电力规划设计研究院重庆有限公司 | Grounding current diversion method for grounding short-circuit fault of 110kV full-cable outlet transformer substation |
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