CN103324788A - Lightning stroke characteristic assessment method - Google Patents

Lightning stroke characteristic assessment method Download PDF

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Publication number
CN103324788A
CN103324788A CN2013102178610A CN201310217861A CN103324788A CN 103324788 A CN103324788 A CN 103324788A CN 2013102178610 A CN2013102178610 A CN 2013102178610A CN 201310217861 A CN201310217861 A CN 201310217861A CN 103324788 A CN103324788 A CN 103324788A
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China
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lightning
resistance
neutral point
current
value
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CN2013102178610A
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Chinese (zh)
Inventor
陈荣锋
刘刚
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华南理工大学
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Priority to CN2013102178610A priority Critical patent/CN103324788A/en
Publication of CN103324788A publication Critical patent/CN103324788A/en

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Abstract

The invention discloses a lightning stroke characteristic assessment method which includes the following steps of: (1) determining a lightning stroke model; (2) determining a tower model and impulse grounding resistance; (3) determining an insulator model and flashover criteria of the insulator model; (4) selecting a line model and a matched load; (5) changing the neutral point grounding modes; (6) measuring zero sequence current values and neutral point potentials in different grounding modes. The lightning stroke characteristic assessment method has the advantage of being capable of being used for accurately assessing the effect of difference of the neutral point grounding modes in a 10kV lightning stroke characteristic on the lightning stroke characteristic.

Description

A kind of thunderbolt method of evaluating characteristic
Technical field
The present invention relates to a kind of power distribution network lightning protection assessment, particularly a kind of thunderbolt method of evaluating characteristic.
Background technology
Concerning power distribution network owing to netted electric network composition, suffering the thunder probability large; the dielectric level of adding power distribution network is low; have a large amount of insulation weakness; not only directly thunder can work the mischief, respond to Lei Yeneng and work the mischief, and the lightning protection of power distribution network there is no the direct lightning strike safeguard measure; main by being installed in the protection of arrester on the electrical network; and also have some problems on use, maintenance and the ground connection of lightning arrester, so the damage to crops caused by thunder accident of power distribution network is higher, especially tripping rate with lightning strike is high.Through proof is investigated and researched and analysed to a large amount of power distribution network operation conditionss, neutral grounding in distribution power network has larger impact to the power distribution network tripping rate with lightning strike, mainly is reflected on the fault generating arc rate of insulator when being struck by lightning.
When electric network capacitance and current hour adopts a neutral-point ground insulation mode, simple, economical, great majority are because the instantaneity earth faults that thunderbolt causes can both reliably disappear, and the power supply of electrical network is reliable also higher; When capacitance current increases to the blow-out critical value when above, because all reliably blow-outs of most of ground connection, can develop into intermittent arc grounding, or stable arcing ground, form phase fault, then because the accident that the electrical network single-phase earthing causes will increase, can produce adverse influence to power supply reliability, power outage increases, and in addition personal safety is consisted of serious threat.
Neutral Grounding through Resistance in Electrical is joined zero-sequenceprotection, most of transient faults all can make the feeder switch tripping operation, and because fault current is large, switch will frequently cut-off, and large fault current has strengthened the wearing and tearing of switch contact, increased maintenance workload, because fault current is large, can cause that also the earth potential of trouble spot raises, personal safety is constituted a threat to, communication line is caused interference, thereby the Neutral Grounding through Resistance in Electrical mode can cause negative impact to the power supply reliability of power distribution network;
Neutral by arc extinction coil grounding, particularly when automatic Following-up Compensation Arc-decreasing Wires ground connection, because arc-extinction device is controlled at the ground connection residual flow below the 10A all the time, less than the blow-out critical value, add the ascending velocity that arc-extinction device can slow down arc road recovery voltage, most of instantaneity ground arcs can both reliably extinguish, development does not become nonvolatil earth fault, even the mild degree that perfoliate puncture also can make owing to ground current is little insulation damages has occured, be convenient to maintenance, so be favourable to improving power supply reliability, also reduced the maintenance load of switchgear simultaneously.On the other hand, the damping resistance that is serially connected between reactor and the ground plays a part to absorb energy and damping, the effectively amplitude of over-voltage suppression.Site test according to ZXB series automatic tracking and compensating arc distinction device proves, can arrive superpotential amplitude limitation below the 1.8U φ.Because fault current is little, also less on the impact of communication line simultaneously.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art with not enough, a kind of thunderbolt method of evaluating characteristic is provided, the method is a kind of assessment thunderbolt characteristic method based on 10kV distribution neutral grounding mode otherness, for the impact of 10kV neutral grounding in distribution power network on lightning surge, in order correctly to assess 10kV neutral grounding in distribution power network otherness to the impact of thunderbolt characteristic, the method is carried out computational analysis by the mathematical model that makes up the 10kV distribution, different earthing mode othernesses is chosen transformation construction and the 10kV distribution line lightning protection risk assessment of the 10kV distribution line in the serious area of suitable damage to crops caused by thunder to distribution thunderbolt characteristic quantitative evaluation.
Purpose of the present invention is achieved through the following technical solutions: a kind of thunderbolt method of evaluating characteristic may further comprise the steps:
1. build corresponding mathematical model by 10kV distribution actual motion structure,
(1) set up the two exponential waves of-2.6/50 μ s as the equivalent mathematical model of lightning current,
Wherein-2.6/50 the expression formula of the two exponential waves of μ s is:
i = 1.057 I m ( e 1.5 × 10 4 t - e - 1.86 × 10 6 t ) ,
In the following formula, t is action time (s); Im is amplitude of lightning current (kA), the equivalent value wave impedance Z of lightning channel 0Change between 300~3000 Ω, lightning current is during less than 5kA, Z 0Be about thousands of ohms; Lightning current when 5~30kA, Z 0Span be 900~600 Ω; In large range of current 30~200kA, Z 0The span of value is 300~600 Ω;
(2) determine Tower Model and impulse earthed resistance, at first shaft tower is divided into trunk portion, holder part and cross-arm part, calculate respectively the wave impedance of trunk portion, holder part and cross-arm part, then directly adopt power frequency earthing resistance to serve as impulse earthed resistance and calculate;
(3) insulator model and flashover criterion thereof, line insulation submodel comprise stray capacitance and the voltage-controlled flashover switch of its both coupling effects of sign that are parallel between phase conductor and the steel tower, and described line insulation submodel electric capacity value is 10pF; The effect voltage that the flashover criterion is got on the insulator surpasses himself 50% sparking voltage moment;
(4): select circuit model and matched load, adopting Frequency Dependent (Phase) Model corresponding among the PSACD/EMTDC is frequency dependence (phase place) circuit model, owing to being hit the impact that the lightning impulse superpotential of shaft tower can be subject to contiguous shaft tower reflection wave, in order accurately to calculate its lightning withstand level, hit the span that must there be a sufficient amount shaft tower both sides to guarantee that ripple is from being hit shaft tower to the traveling time of the adjacent farthest shaft tower wavefront time greater than 1/2 lightning impulse.
2. the fault branch of simulation numerical model is set, changes the amplitude of lightning current size, and measure the amplitude of lightning current of 10kA, 20kA, 30kA, 50kA, 100kA.
3. change the different earthing modes of transformer neutral point at 10kV distribution power end; And zero-sequence current value, neutral point current potential and vibration release time of measuring transformer neutral point when different amplitude of lightning current.
4. when changing the different earthing mode of transformer neutral point, when calculating grounded system via resistance and compensated distribution network, change the resistance value size from 1 Ω~1000 Ω and change the inductance value size from 0.1H~30H; Zero-sequence current value when measuring different resistance values and different induction value, neutral point current potential and vibration release time, and draw change curve.
Principle of work of the present invention: build corresponding mathematical model by 10kV distribution actual motion structure, set up two exponential waves as the equivalent mathematical model of lightning current; Shaft tower is divided into trunk portion, holder part and cross-arm part, calculates respectively the wave impedance of trunk portion, holder part and cross-arm part and set up the shaft tower numerical model; The line insulation submodel comprises stray capacitance and the voltage-controlled flashover switch of its both coupling effects of sign that are parallel between phase conductor and the steel tower, and described line insulation submodel electric capacity value is 10pF; Then the fault branch of simulation numerical model is set, changes the amplitude of lightning current size; Change the different earthing modes of transformer neutral point at 10kV distribution power end, measure zero-sequence current value, neutral point current potential and vibration release time; When calculating grounded system via resistance and compensated distribution network, the zero-sequence current value when changing resistance value and inductance value and measuring different resistance values and different induction value, neutral point current potential and vibration release time, and draw change curve.Assess the thunderbolt characteristic of different earthing modes according to zero-sequence current and the difference of neutral point current potential, be suitable for transformation construction and the 10kV distribution line lightning protection risk assessment of the 10kV distribution line in the serious area of damage to crops caused by thunder.
The present invention has following advantage and effect with respect to prior art:
1, assessment result is accurate; The present invention carries out computational analysis by the mathematical model that makes up the 10kV distribution, different earthing mode othernesses are chosen transformation construction and the 10kV distribution line lightning protection risk assessment of the 10kV distribution line in the serious area of suitable damage to crops caused by thunder to distribution thunderbolt characteristic quantitative evaluation, can be assessed accurately 10kV neutral grounding in distribution power network otherness to the impact of thunderbolt characteristic.
2, acquired results can instruct the Thunder Protection of 10kV distribution line, for lightning protection measures transformation and the lightning protection planning construction of 10kV distribution line provides reference.
3, according to acquired results can the neutral grounding mode of choose reasonable in different thunder and lightning situations earthing mode select, make 10kV distribution line tripping rate with lightning strike drop to minimum.
Description of drawings
Fig. 1 is PSCAD emulation platform 10kV distribution line emulation wiring diagram.
Fig. 2 is the isolated neutral system schematic diagram.
Fig. 3 is the solidly earthed neutral system schematic diagram.
Fig. 4 is the Neutral Grounding through Resistance in Electrical system schematic.
Fig. 5 is the neutral by arc extinction coil grounding system schematic.
Fig. 6 is the process flow diagram of thunderbolt characteristic evaluation.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, overhead line structures 1, lightning current 2 is according to PSCAD emulation platform 10kV distribution line emulation wiring diagram, Calculation Simulation platform desired parameters.
1. computational data comprises circuit network figure and all kinds of distribution net equipment parameter, adopts PSCAD electro-magnetic transient software to set up 10kV distribution line model.
2. adopt the lightning current model of the two exponential waves of-2.6/50 μ s, its expression formula is:
i = 1.057 I m ( e 1.5 × 10 4 t - e - 1.86 × 10 6 t )
In the following formula, t is action time (s); Im is amplitude of lightning current (kA).The equivalent value wave impedance Z of lightning channel 0Between 300~3000 Ω, change.Lightning current is during less than 5kA, Z 0Be about thousands of ohms; Lightning current when 5~30kA, Z 0Be 900~600 Ω; In large range of current 30~200kA, Z 0Value is 300~600 Ω.
3. determine Tower Model and impulse earthed resistance, consider the catadioptric that the variation of shaft tower diverse location place wave impedance and the lightning wave that causes thus produce when propagating in shaft tower, in order to take into account this impact, multi-wave impedance model is simulated the different parts of shaft tower with the long line of multistage wave impedance, acquired results tallies with the actual situation more, so shaft tower is divided into trunk, support and cross-arm three parts, calculate respectively its wave impedance, carry out Equivalent Calculation with the multi-wave impedance model that consists of whole shaft tower.Owing to the power-frequency earthing impedance in the 10kV distribution earthing device, its impact and power-frequency earthing impedance are comparatively approaching, in lightning protection calculation, can directly use the power-frequency earthing impedance in addition.In view of the stake resistance of Typical Route all less than 15 Ω, directly adopt power frequency earthing resistance to calculate.
4. determine insulator model and flashover criterion thereof, the line insulation submodel is comprised of the stray capacitance that is parallel to the sign coupling effect between phase conductor and the steel tower and voltage-controlled flashover switch, and the electric capacity value is 10pF.The flashover criterion is thought when the effect voltage in the insulation surpasses himself 50% sparking voltage, namely is judged to flashover.
5. select circuit model and matched load to adopt Frequency Dependent (Phase) Model circuit model corresponding among the PSACD/EMTDC.Owing to being hit the impact that the lightning impulse superpotential of shaft tower can be subject to contiguous shaft tower reflection wave, in order accurately to calculate its lightning withstand level, hit the span that must there be a sufficient amount shaft tower both sides to guarantee that ripple is from being hit shaft tower to the traveling time of the adjacent farthest shaft tower wavefront time greater than 1/2 lightning impulse.
6. changing amplitude of lightning current size (measuring 10kA, 20kA, 30kA, 50kA, 100kA amplitude) is added on institute and requires on the fault branch.
7. change neutral point at 10kV distribution high-pressure side transformer change earthing mode (isolated neutral system as shown in Figure 2, grounded system via resistance as shown in Figure 3, compensated distribution network as shown in Figure 4 and solidly grounded system as shown in Figure 5), measure zero-sequence current value, neutral point current potential U N0With the vibration release time.
8. when calculating grounded system via resistance and compensated distribution network, need to change the resistance value size from 1 Ω~1000 Ω and change the inductance value size from 0.1H~30H, then zero-sequence current value, the neutral point current potential U when different resistance values or inductance value N0With the vibration release time.
9. as shown in Figure 6, measure zero-sequence current value, the neutral point current potential U of different amplitude of lightning current under different earthing modes according to this flow process N0With vibration release time, then curve plotting.
Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (7)

1. a thunderbolt method of evaluating characteristic is characterized in that, may further comprise the steps:
Step 1: set up the equivalent mathematical model of lightning current;
Step 2: determine Tower Model and impulse earthed resistance;
Step 3: set up the insulator model and select the flashover criterion;
Step 4: select circuit model and matched load;
Step 5: set up PSCAD emulation platform 10kV distribution line Lightning Stroke Model;
Step 6: change the different earthing modes of 10kV network distribution transformer neutral point, measure evaluate parameter and draw change curve.
2. appraisal procedure according to claim 1 is characterized in that, the expression formula of the equivalent mathematical model of described lightning current in the described step 1 is:
i = 1.057 I m ( e 1.5 × 10 4 t - e - 1.86 × 10 6 t ) ,
In the following formula, t is action time; Im is amplitude of lightning current.
3. appraisal procedure according to claim 1 is characterized in that, described step 2 is further comprising the steps of:
(1), shaft tower is divided into trunk portion, holder part and cross-arm part, calculate respectively the wave impedance of trunk portion, holder part and cross-arm part;
(2), directly adopting power frequency earthing resistance to serve as impulse earthed resistance calculates.
4. appraisal procedure according to claim 1, it is characterized in that, insulator model in the described step 3 is equivalent to stray capacitance and the voltage-controlled flashover switch of its both coupling effects of sign that are parallel between phase conductor and the steel tower, described line insulation submodel electric capacity value is 10pF, and the flashover criterion refers to that the effect voltage on the insulator surpasses himself 50% sparking voltage and insulator arc-over just occurs is judged to be arcing time.
5. appraisal procedure according to claim 1 is characterized in that, the circuit model in the described step 4 adopts frequency dependence circuit model corresponding among the PSACD/EMTDC.
6. appraisal procedure according to claim 1 is characterized in that, described step 5 may further comprise the steps:
A: the lightning fault branch road of simulation numerical model is set, changes the amplitude of lightning current size;
B: the amplitude of lightning current that measures 10kA, 20kA, 30kA, 50kA and 100kA.
7. appraisal procedure according to claim 1 is characterized in that, described step 6 may further comprise the steps:
A: change the different earthing modes of transformer neutral point at 10kV distribution power end;
B: measure zero-sequence current value, neutral point current potential and vibration release time;
C: when calculating grounded system via resistance and compensated distribution network, span 1~1000 Ω of resistance value, the span 0.1~30H of inductance value;
D: the zero-sequence current value when measuring different resistance values and different induction value, neutral point current potential and vibration release time, and draw change curve.
CN2013102178610A 2013-06-03 2013-06-03 Lightning stroke characteristic assessment method CN103324788A (en)

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN103529367A (en) * 2013-10-17 2014-01-22 上海斐讯数据通信技术有限公司 DSL (Digital Subscriber Line) Modem lightning stroke prevention testing method
CN103675602A (en) * 2013-12-03 2014-03-26 昆明理工大学 Method for discriminating lightning flashover and non-flashover of power transmission lines
CN104931852A (en) * 2015-05-28 2015-09-23 中国南方电网有限责任公司超高压输电公司检修试验中心 Direct current earth electrode line flashover fault circuit model, analysis method and system based on arcing of arcing horn
CN106053994A (en) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 Lightning impulse response detection system of high-voltage DC power transmission equipment
CN106054039A (en) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 DC line tower transient impact performance detection system
CN106053993A (en) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 Thunder impulse response detection system of AC line tower
CN106124900A (en) * 2016-07-12 2016-11-16 南方电网科学研究院有限责任公司 The lightning impulse response performance detecting system of strip conductor
CN106226619A (en) * 2016-07-12 2016-12-14 南方电网科学研究院有限责任公司 The transient impact performance detecting system of current conversion station equipment
CN106249072A (en) * 2016-07-12 2016-12-21 南方电网科学研究院有限责任公司 The transient impact performance detecting system of high-voltage AC transmission equipment
CN108767822A (en) * 2018-06-22 2018-11-06 国网辽宁省电力有限公司电力科学研究院 The matching process of circuit model and transformer type for relay protection
CN108761184A (en) * 2018-05-18 2018-11-06 云南电网有限责任公司电力科学研究院 A kind of steel tower Potential distribution and impedance operator test method based on lightning impulse
CN109241664A (en) * 2018-09-29 2019-01-18 贵州电网有限责任公司 A kind of analysis calculation method about wind-driven generator thunder and lightning electro-magnetic transient characteristic
CN109507552A (en) * 2018-11-29 2019-03-22 清华大学 Shaft tower shock wave impedance detection method and device based on tower top back wave

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Cited By (21)

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CN103529367B (en) * 2013-10-17 2016-04-20 上海斐讯数据通信技术有限公司 A kind of DSL Modem anti-lightning method of testing
CN103529367A (en) * 2013-10-17 2014-01-22 上海斐讯数据通信技术有限公司 DSL (Digital Subscriber Line) Modem lightning stroke prevention testing method
CN103675602B (en) * 2013-12-03 2016-12-07 昆明理工大学 A kind of transmission line lightning stroke flashover and the method for discrimination of non-flashover
CN103675602A (en) * 2013-12-03 2014-03-26 昆明理工大学 Method for discriminating lightning flashover and non-flashover of power transmission lines
CN104931852A (en) * 2015-05-28 2015-09-23 中国南方电网有限责任公司超高压输电公司检修试验中心 Direct current earth electrode line flashover fault circuit model, analysis method and system based on arcing of arcing horn
CN104931852B (en) * 2015-05-28 2018-03-09 中国南方电网有限责任公司超高压输电公司检修试验中心 The direct current grounding pole line flashover failure analysis methods of arc are built based on arcing horn
CN106054039B (en) * 2016-07-12 2019-08-23 南方电网科学研究院有限责任公司 The transient impact performance detecting system of DC line shaft tower
CN106124900A (en) * 2016-07-12 2016-11-16 南方电网科学研究院有限责任公司 The lightning impulse response performance detecting system of strip conductor
CN106053993A (en) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 Thunder impulse response detection system of AC line tower
CN106226619A (en) * 2016-07-12 2016-12-14 南方电网科学研究院有限责任公司 The transient impact performance detecting system of current conversion station equipment
CN106054039A (en) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 DC line tower transient impact performance detection system
CN106053994A (en) * 2016-07-12 2016-10-26 南方电网科学研究院有限责任公司 Lightning impulse response detection system of high-voltage DC power transmission equipment
CN106249072B (en) * 2016-07-12 2019-12-27 南方电网科学研究院有限责任公司 Transient impact performance detection system of high-voltage alternating-current transmission equipment
CN106053994B (en) * 2016-07-12 2019-11-08 南方电网科学研究院有限责任公司 The lightning impulse of high-voltage direct-current transmission system responds detection system
CN106053993B (en) * 2016-07-12 2019-08-23 南方电网科学研究院有限责任公司 The lightning impulse of alternating current circuit shaft tower responds detection system
CN106249072A (en) * 2016-07-12 2016-12-21 南方电网科学研究院有限责任公司 The transient impact performance detecting system of high-voltage AC transmission equipment
CN108761184A (en) * 2018-05-18 2018-11-06 云南电网有限责任公司电力科学研究院 A kind of steel tower Potential distribution and impedance operator test method based on lightning impulse
CN108761184B (en) * 2018-05-18 2021-02-02 云南电网有限责任公司电力科学研究院 Iron tower potential distribution and impedance characteristic testing method based on lightning impulse
CN108767822A (en) * 2018-06-22 2018-11-06 国网辽宁省电力有限公司电力科学研究院 The matching process of circuit model and transformer type for relay protection
CN109241664A (en) * 2018-09-29 2019-01-18 贵州电网有限责任公司 A kind of analysis calculation method about wind-driven generator thunder and lightning electro-magnetic transient characteristic
CN109507552A (en) * 2018-11-29 2019-03-22 清华大学 Shaft tower shock wave impedance detection method and device based on tower top back wave

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Application publication date: 20130925