CN105958464A - EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method - Google Patents
EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method Download PDFInfo
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- CN105958464A CN105958464A CN201610371306.7A CN201610371306A CN105958464A CN 105958464 A CN105958464 A CN 105958464A CN 201610371306 A CN201610371306 A CN 201610371306A CN 105958464 A CN105958464 A CN 105958464A
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- arcing horn
- electrode circuit
- gap
- direct current
- ground electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
The invention discloses an EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method. The method comprises the following steps: 1, selecting an arcing horn gap value according to a switching overvoltage level; 2, selecting the arcing horn gap value according to the arc blowout capability; 3, proposing a final arcing horn configuration result through integrating the theories of selecting the gap value according to the switching overvoltage level and the arc blowout capability. The method gives full consideration to the along-line overvoltage and arcing horn blowout capability of an EHV DC grounding electrode circuit, determines the arcing horn gap value through employing a volt-ampere characteristic intersection method, meets the requirements of the insulation coordination of the EHV DC grounding electrode circuit, solves technical problems that overvoltage breakdown happens to the EHV DC grounding electrode circuit and DC follow current cannot achieve arc blowout, and improves the operation reliability of the EHV DC grounding electrode circuit.
Description
Technical field
The present invention relates to extra-high voltage direct current ground electrode circuit Insulation Coordination field, more specifically for it is a kind of extra-high voltage
Direct current grounding pole line insulation fitting method.
Background technology
Direct current the earth return system (earthing pole and ground electrode circuit) is one of important component part of DC transmission system.
The method of operation of DC transmission system is versatile and flexible, and the working method of earthing pole is the most different.Run at monopolar ground return
Under mode, the whole earthing poles that deliver current through running pole flow into the earth.In order to reduce earth current, current conversion station electric power is set
Standby impact, earthing pole is typically located at the position away from current conversion station.Ground electrode circuit is and connects current conversion station and earthing pole
Circuit (generally overhead transmission line), its safe and stable operation is most important to whole straight-flow system.
Direct current grounding pole circuit has that conveying electric current is big, line electricity is forced down, resistance to thunder level is relatively low, requires earth fault
After possess the features such as self arc ability.Due to ground electrode circuit transmission is direct current, earth fault once occurs, its fault current
For galvanic current stream, the most periodically zero crossing, self arc is more difficult.In recent years, along with China's DC transmission engineering
Building and development, electric pressure and the transmission capacity of system improve constantly, the problem caused because of ground electrode circuit insulation fault by
Gradually cause concern, such as:
On July 6th, (1) 2012, ± 500kV Hulun Buir-DC transmission engineering Yi Min current conversion station pole, Liaoning II direct current system
Uniting when monopolar metallic return turns monopolar ground return operation, earthing pole resistance monitors that resistance is abnormal, and July 7, operations staff exists
Find at No. 4 towers that wire insulation bursts, wire dropping.
On December 15th, (2) 2012, the station asymmetric operation of ± 800kV Chu Sui DC transmission engineering Chuxiong causes earthing pole to dodge
Network.Because fault occurs in station, fault pole does not allows to restart, and earthing pole flashover fails self-cleaning, after fault 2s, perfects pole and restarts
Remove fault.
Visible, when ground electrode circuit generation earth fault, under different Preservation tactics, may cause running pole and restart
Dynamic or locking, even ground electrode circuit such as go offline at the major accident.The arcing horn gap analyzing reason, mainly ground electrode circuit exists
Fail effective blow-out after over-voltage breakdown, cut off direct current afterflow.
The design of China's direct current grounding pole circuit, Primary Reference be ± 500kV Tianguang HVDC time Canada the West cover and carry
The design principle of the Brazilian Yi Taipu DC engineering of confession and related data, Main Basis is DL/T 5224-2005 " HVDC
Transmission of electricity the earth returns and runs System design technology and specify " relevant regulations of (calling " regulation " in the following text).About arcing horn gap, " regulation "
Point out:
1) at the two ends of ground electrode circuit insulator chain, arcing horn should be installed additional, prevent thunderbolt from going offline.The suitable horizontal cloth of arcing horn
Put, and be furnished with arcing angle.
2) gap of arcing horn should be according to direct current afterflow size reasonable value.Arcing horn gap should be less than 0.85 times of insulator
Effectively go here and there length, puncture during to ensure thunderbolt；Meanwhile, arcing horn gap should be greater than direct current afterflow electric arc blow-out gap, disconnected to ensure
Open direct current afterflow.
3) ground electrode circuit preferably uses DC-disc type insulator, and it is true that insulation sub-pieces number is typically based on arcing horn clearance requirement
Fixed, and must not be less than two.
Visible, arcing horn Interval selecting is the key of ground electrode circuit Insulation Coordination design.Therefore, it is necessary to earthing pole
The Insulation Coordination of circuit is studied, and finds a kind of collocation method to determine arcing horn gap.
Summary of the invention
The purpose of the present invention is in order to overcome the weak point of above-mentioned background technology, and provides a kind of extra-high voltage DC grounding electrode
Line insulation fitting method, considers the distribution of ground electrode circuit switching overvoltage along the line as a whole and direct current afterflow is distributed, it is proposed that one
Species diversity insulation configuration scheme, effectively solves switching overvoltage and punctures and the problem of direct current afterflow blow-out of being struck by lightning.
The subject matter that extra-high voltage direct current ground electrode circuit Insulation Coordination is to be solved is arcing horn gap and insulation sub-pieces number,
Owing to arcing horn gap should take the 0.82-0.85 of insulator chain length, insulation sub-pieces number can be back-calculated to obtain according to arcing horn gap, therefore
The Insulation Coordination of extra-high voltage direct current ground electrode circuit mainly determines arcing horn gap.Arcing horn gap need to meet claimed below:
1. should avoid occurring insulation breakdown under switching overvoltage effect as far as possible；2. after arcing horn gap breakdown, should be able to be at short notice
Effectively blow-out, disconnects direct current afterflow.According to above-mentioned requirements, this patent arcing horn gap should be selected by following two principle: 1. presses
Switching overvoltage horizontally selected arcing horn gap width；2. press arc-rupturing capacity and select arcing horn gap width.
To achieve these goals, the technical scheme is that such: a kind of extra-high voltage direct current ground electrode circuit is exhausted
Edge fitting method, it is characterised in that include step in detail below:
Step 1, by switching overvoltage horizontally selected arcing horn gap width；
Step 2, selects arcing horn gap width by arc-rupturing capacity；
Step 3, summary selects the conclusion in gap by switching overvoltage level and arc-rupturing capacity, proposes final trick arc
Angle configuration result.
In technique scheme, described step 1 is further comprising the steps of:
Step 1-1, determines the overvoltage distribution that ground electrode circuit is along the line；
Step 1-2, determines switching impulse 50% discharge voltage of different gap；
Step 1-3, based on overvoltage distribution and arcing horn gap and switching impulse tolerance level, determines arcing horn along the line
Gap configuration result.
In technique scheme, described step 2 is further comprising the steps of:
Step 2-1, determines that ground electrode circuit arcing horn along the line direct current afterflow is distributed, and obtains the burning of arcing horn arc stability
The external condition (external characteristic curve) of (blow-out failure)；
Step 2-2, determines that under the C-V characteristic of arcing horn, i.e. arc stability fired state, electric arc both end voltage U is with direct current
The change curve of afterflow I；
Step 2-3, uses VA characteristic curve to intersect method, determines arcing horn gap configuration result along the line.
In technique scheme, the arcing horn gap configuration result of described step 3:
| The distance proportion (%) of distance earthing pole | Arcing horn gap recommendation (mm) |
| 40 | 400 |
| 70 | 500 |
| 100 | 700 |
The invention has the beneficial effects as follows: the method design has considered extra-high voltage direct current ground electrode circuit mistake along the line
Voltage and arcing horn arc-rupturing capacity, use VA characteristic curve to intersect method and determine arcing horn gap width, meet extra-high voltage direct-current
The requirement of ground electrode circuit Insulation Coordination, it is to avoid extra-high voltage direct current ground electrode circuit generation over-voltage breakdown and direct current afterflow without
The technical problem of method blow-out, improves the operational reliability of extra-high voltage direct current ground electrode circuit.
Accompanying drawing explanation
Fig. 1 arcing horn of the present invention gap configuration flow chart.
Fig. 2 embodiment of the present invention ground electrode circuit switching overvoltage along the line is distributed.
The external characteristic curve of Fig. 3 embodiment of the present invention ground electrode circuit.
Fig. 4 embodiment of the present invention different gap apart under electric arc VA characteristic curve.
Fig. 5 embodiment of the present invention typical arcing horn C-V characteristic (camber line) and circuit external characteristic curve (straight line) side of intersecting
Method.
Detailed description of the invention
Describe performance of the present invention below in conjunction with the accompanying drawings in detail, but they are not intended that limitation of the invention, only make
Citing, be will become clearer from easy to understand by explanation advantages of the present invention simultaneously.
A kind of extra-high voltage direct current ground electrode circuit Insulation Coordination method, as it is shown in figure 1, comprise the following steps:
Step 1, by switching overvoltage horizontally selected arcing horn gap width, concretely comprises the following steps:
Step 1-1, determines the overvoltage distribution that ground electrode circuit is along the line；
Step 1-2, determines switching impulse 50% discharge voltage of different gap；
Step 1-3, based on overvoltage distribution and arcing horn gap and switching impulse tolerance level, determines arcing horn along the line
Gap configuration result.
Step 2, selects arcing horn gap width by arc-rupturing capacity, concretely comprises the following steps:
Step 2-1, determines that ground electrode circuit arcing horn along the line direct current afterflow is distributed, and obtains the burning of arcing horn arc stability
The external condition (external characteristic curve) of (blow-out failure)；
Step 2-2, determines that under the C-V characteristic of arcing horn, i.e. arc stability fired state, electric arc both end voltage U is with direct current
The change curve of afterflow I；
Step 2-3, uses VA characteristic curve to intersect method, determines arcing horn gap configuration result along the line.
Step 3, summary selects the conclusion in gap by switching overvoltage level and arc-rupturing capacity, proposes final trick arc
Angle configuration result.
As most preferred embodiment, according to a kind of extra-high voltage direct current ground electrode circuit Insulation Coordination method, final trick is proposed
The method step of arc angle configuration result is:
(1) by the side of switching overvoltage horizontally selected arcing horn gap width
First, determining the overvoltage distribution that extra-high voltage direct current ground electrode circuit is along the line, research shows, overvoltage is along earthing pole
Circuit tapers off trend (current conversion station side maximum, earthing pole side minimum), as shown in Figure 2.
Secondly, the switching overvoltage breakdown characteristics experimental study that arcing horn is carried out, obtain the operation tolerance of different gap
Level i.e. switching impulse 50% discharge voltage.Result of the test is as shown in table 1 below.
Table 1 arcing horn gap operating impacts 50% discharge voltage
| Arcing horn clearance distance/mm | U50%/kV |
| 300 | 172.5 |
| 400 | 213.2 |
| 500 | 231.8 |
| 600 | 287 |
| 700 | 325.5 |
Finally, based on overvoltage distribution and arcing horn gap and switching impulse tolerance level, arcing horn gap configuration is determined
As a result, as shown in table 2 below:
The arcing horn clearance distance configuration result that table 2 switching impulse tolerance level determines
| Arcing horn clearance distance/mm | Configuration scope % (distance proportion of distance earthing pole) |
| 300 | 53 |
| 400 | 65 |
| 500 | 71 |
| 600 | 88 |
| 700 | 100 |
(2) method that arc-rupturing capacity selects arcing horn gap width is pressed
First, determine that extra-high voltage direct current ground electrode circuit arcing horn along the line direct current afterflow is distributed, obtain arcing horn electric arc steady
The external condition of fixed burning (blow-out failure): in the case of maintaining a certain direct current afterflow I, needs the voltage provided bent outside arcing horn
Line U (external characteristic curve).The external characteristic curve that ground electrode circuit different faults along the line point is corresponding is illustrated in fig. 3 shown below.
Secondly, determining under the C-V characteristic of arcing horn, i.e. arc stability fired state, electric arc both end voltage U continues with direct current
The change curve of stream I, this curve can obtain, as shown in Figure 4 according to arcing test.
Finally, based on external characteristic curve and electric arc VA characteristic curve, use VA characteristic curve intersect method to difference between
The arcing horn arc-rupturing capacity of gap value judges, typical arcing horn C-V characteristic (camber line) and circuit external characteristic curve (straight line)
Intersection method is as it is shown in figure 5, the circuit external characteristics that each bar straight line is breakdown point when being positioned at ground electrode circuit diverse location along the line is bent
Line (k0=1 is current conversion station outlet, and k0=0 is earthing pole), if C-V characteristic is positioned at above certain circuit external characteristic curve, then recognizes
It is applicable to the line range that circuit external characteristic curve is corresponding for this arcing horn gap width.
(3) arcing horn gap configuration
Summary selects the conclusion in gap by switching overvoltage level and arc-rupturing capacity, based on differentiation insulation configuration
Basic thought, final arcing horn gap configuration result is as shown in table 3.
Table 3 arcing horn gap configuration result
| The distance proportion (%) of distance earthing pole | Arcing horn gap recommendation (mm) |
| 40 | 400 |
| 70 | 500 |
| 100 | 700 |
Unspecified it is prior art.
Claims (4)
1. an extra-high voltage direct current ground electrode circuit Insulation Coordination method, it is characterised in that include step in detail below:
Step 1, by switching overvoltage horizontally selected arcing horn gap width；
Step 2, selects arcing horn gap width by arc-rupturing capacity；
Step 3, summary selects the conclusion in gap by switching overvoltage level and arc-rupturing capacity, proposes final arcing horn and join
Put result.
Extra-high voltage direct current ground electrode circuit Insulation Coordination method the most according to claim 1, it is characterised in that described step
Rapid 1 further comprising the steps of:
Step 1-1, determines the overvoltage distribution that ground electrode circuit is along the line；
Step 1-2, determines switching impulse 50% discharge voltage of different gap；
Step 1-3, based on overvoltage distribution and arcing horn gap and switching impulse tolerance level, determines arcing horn gap along the line
Configuration result.
Extra-high voltage direct current ground electrode circuit Insulation Coordination method the most according to claim 1, it is characterised in that described step
Rapid 2 further comprising the steps of:
Step 2-1, determines that ground electrode circuit arcing horn along the line direct current afterflow is distributed, and obtains the external of arcing horn arc stability burning
Condition；
Step 2-2, determines that under the C-V characteristic of arcing horn, i.e. arc stability fired state, electric arc both end voltage U is with direct current afterflow
The change curve of I；
Step 2-3, uses VA characteristic curve to intersect method, determines arcing horn gap configuration result along the line.
Extra-high voltage direct current ground electrode circuit Insulation Coordination method the most according to claim 3, it is characterised in that described trick arc
Angle gap configuration result is:
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610371306.7A CN105958464A (en) | 2016-05-30 | 2016-05-30 | EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method |
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| CN201610371306.7A CN105958464A (en) | 2016-05-30 | 2016-05-30 | EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171248A (en) * | 2017-06-29 | 2017-09-15 | 中国电力工程顾问集团西南电力设计院有限公司 | The staged sub-pieces number collocation method of ± 800kV extra-high voltage direct current ground electrode circuits |
| CN107979057A (en) * | 2017-12-14 | 2018-05-01 | 国网四川省电力公司电力科学研究院 | The line located Insulation Coordination method of shape high voltage DC earthing pole based on place of safety domain method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882876A (en) * | 2015-06-19 | 2015-09-02 | 中国电力科学研究院 | Extra-high voltage DC grounding electrode circuit protection system |
-
2016
- 2016-05-30 CN CN201610371306.7A patent/CN105958464A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882876A (en) * | 2015-06-19 | 2015-09-02 | 中国电力科学研究院 | Extra-high voltage DC grounding electrode circuit protection system |
Non-Patent Citations (3)
| Title |
|---|
| 张冯硕等: "特高压直流接地极线路绝缘配合研究", 《电力建设》 * |
| 张冯硕等: "直流接地极招弧角熄弧特性研究", 《高压电气》 * |
| 徐志坚: "直流接地极招弧角熄弧能力研究", 《万方学位论文数据库》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171248A (en) * | 2017-06-29 | 2017-09-15 | 中国电力工程顾问集团西南电力设计院有限公司 | The staged sub-pieces number collocation method of ± 800kV extra-high voltage direct current ground electrode circuits |
| CN107171248B (en) * | 2017-06-29 | 2018-11-09 | 中国电力工程顾问集团西南电力设计院有限公司 | The staged insulator the piece number configuration method of ± 800kV extra-high voltage direct current ground electrode circuits |
| CN107979057A (en) * | 2017-12-14 | 2018-05-01 | 国网四川省电力公司电力科学研究院 | The line located Insulation Coordination method of shape high voltage DC earthing pole based on place of safety domain method |
| CN107979057B (en) * | 2017-12-14 | 2020-04-10 | 国网四川省电力公司电力科学研究院 | High-voltage direct-current grounding electrode line differential insulation matching method based on safe region method |
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Application publication date: 20160921 |
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