CN103675681A - 220kV power transmission line three-phase short-circuit operating method - Google Patents
220kV power transmission line three-phase short-circuit operating method Download PDFInfo
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- CN103675681A CN103675681A CN201310735945.3A CN201310735945A CN103675681A CN 103675681 A CN103675681 A CN 103675681A CN 201310735945 A CN201310735945 A CN 201310735945A CN 103675681 A CN103675681 A CN 103675681A
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Abstract
The invention relates to a 220kV power transmission line three-phase short-circuit operating technology, in particular to a 220kV power transmission line three-phase short-circuit operating method. The method comprises the following steps: firstly, manufacturing a short-circuit tool in a way of distributing an expanding T-shaped wire clamp, a short-circuit wire and an expanding T-shaped wire clamp; secondly, pretreating a three-phase line and coating with an aluminum armor tape; lastly, connecting the short-circuit tool, wherein the expanding T-shaped wire clamps on a phase B are overlapped one above the other. The conventional expanding T-shaped wire clamp is taken as a three-phase short circuit connecting tool, and the requirement on short circuit can only be met by selecting wire clamps according to the magnitude of current under the consideration of high short-circuit current. The expanding T-shaped wire clamps can be connected conveniently with a three-phase power transmission line via the aluminum armor tape, thereby enhancing the connecting stability, bringing convenience to operation, shortening the construction time, enhancing the reliability of a short circuit point during zero current raising test of a generator set and avoiding the phenomenon of overheat of the short circuit point during the test.
Description
Technical field
The present invention relates to a kind of 220kV power transmission line three-phase shortcircuit operative technique, particularly a kind of 220kV power transmission line three-phase shortcircuit operational method.
Background technology
220kV power transmission line three-phase shortcircuit application of installation is very extensive, is mainly used in genset zero and rises in up-flow process of the test, for 220kV power transmission line is carried out to three-phase shortcircuit.Prior art be mainly adopt aluminium armor tape by 220kV power transmission line together with the colligation of three-phase shortcircuit line.But in use, the colligation time is longer on the one hand, on the other hand, between power transmission line and short-circuit line, contact undertighten, therefore, the position that power transmission line contacts with short-circuit line easily produces fever phenomenon in genset zero plays up-flow process of the test, thereby affects circuit operation.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, and it is tight to propose a kind of connection, is difficult for the 220kV power transmission line three-phase shortcircuit operational method of heating and impact operation.
The present invention is achieved through the following channels:
220kV power transmission line three-phase shortcircuit operational method, its main points are, comprise the steps:
1) provide hole enlargement T-shape cable clamp, short-circuit line and securing member, the conductor compression jointing portion that wherein hole enlargement T-shape cable clamp includes geometrical clamp, is connected with geometrical clamp, and the terminal strip being connected by securing member with geometrical clamp, geometrical clamp and terminal strip surround and form a circular opening, to clamp and fixing power transmission line;
2) provide two cover short-circuiting means, every cover short-circuiting means forms by two hole enlargement T-shape cable clamps and a short-circuit line, the both ends of short-circuit line are connected to respectively to conductor compression jointing portion, one of them hole enlargement T-shape cable clamp of first set short-circuiting means is referred to as to A phase wire clamp, another hole enlargement T-shape cable clamp is referred to as AB phase wire clamp, one of them hole enlargement T-shape cable clamp of the second cover short-circuiting means is referred to as to C phase wire clamp, and another hole enlargement T-shape cable clamp is referred to as CB phase wire clamp, with corresponding three-phase line, is described;
3) first with brass wire brush, remove the oxide of three phase transmission line and hole enlargement T-shape cable clamp junction, and by alcohol cloth wiped clean; With alcohol cloth, clean the inside surface that hole enlargement T-shape cable clamp contacts with power transmission line again; Finally use aluminium armor tape in the length of three phase transmission line and hole enlargement T-shape cable clamp junction colligation 20cm, complete connection pre-service;
4) A phase wire clamp is connected with A phase power transmission line: A phase power transmission line is placed in the circular opening of wire clamp, then by securing member, geometrical clamp and terminal strip is fastenedly connected;
5) operate equally C phase wire clamp and be connected with C phase power transmission line, then AB phase wire clamp and CB phase wire clamp are all connected on B phase power transmission line, in upper and lower stacked mode, distribute; Completing short circuit connects.
The present invention can further be specially:
By AB phase wire clamp and BC phase wire clamp meta, the terminal strip bolt pickup groove on the wire clamp of B phase power transmission line top is expanded into sexangle.
On the terminal strip of each hole enlargement T-shape cable clamp, be provided with bolt pickup groove, described securing member is bolt and nut, and for the ease of the wire clamp of top is carried out to fastening operation, the groove that is therefore fixed expands, and can it can use instrument clamp nut.
The present invention has adopted existing hole enlargement T-shape cable clamp as the fastening means of three-phase shortcircuit, described T-shape cable clamp is former is for connecting drainage thread, the present inventor uses it for short-circuiting means, owing to considering that short-circuit current is large, therefore need to wire clamp, select according to size of current, could meet short circuit demand.Hole enlargement T-shape cable clamp and three phase transmission line easy to connect, and by aluminium armor tape, connect very stablely, easy to operate, the engineering time is short, has improved the reliability of short dot when genset zero plays rising test, and during warranty test there is not superheating phenomenon in short dot.
Accompanying drawing explanation
Figure 1 shows that power transmission line three-phase short-circuit device of the present invention is connected to the structural representation of power transmission line;
Figure 2 shows that the structural representation of hole enlargement T-shape cable clamp of the present invention; Figure 3 shows that the right view of Fig. 2.
Below in conjunction with embodiment, the present invention will be further described.
Embodiment
Most preferred embodiment:
With reference to accompanying drawing 1, first provide a kind of 220kV power transmission line three-phase shortcircuit device: described three-phase shortcircuit device comprises 220kV power transmission line A, B phase short-circuiting means and 220kV power transmission line B, C phase short-circuiting means.220kV power transmission line A, B phase short-circuiting means and 220kV power transmission line B, C phase short-circuiting means include identical hole enlargement T-shape cable clamp, short-circuit line 5, securing member.One of them hole enlargement T-shape cable clamp of A, B phase short-circuiting means is referred to as A phase wire clamp 1, and another hole enlargement T-shape cable clamp is referred to as AB phase wire clamp 2.One of them hole enlargement T-shape cable clamp of 220kV power transmission line B, C phase short-circuiting means is referred to as C phase wire clamp 3, and another hole enlargement T-shape cable clamp is referred to as CB phase wire clamp 4.Like this, the hole enlargement T-shape cable clamp combination being positioned in 220kV power transmission line three-phase shortcircuit device on B phase power transmission line consists of two hole enlargement T-shape cable clamp bodies (AB phase wire clamp 2 and CB phase wire clamp 4) and securing member.With reference to accompanying drawing 2 and accompanying drawing 3, described hole enlargement T-shape cable clamp is by geometrical clamp 11, the conductor compression jointing portion 12 that is connected with geometrical clamp, and with geometrical clamp by securing member 15(screw bolt and nut) terminal strip (aluminium pressing plate) that is connected 13 forms, wherein geometrical clamp 11 surrounds and forms a circular opening 14 with terminal strip 13, for clamping power transmission line.The inner chamber of conductor compression jointing portion 12 is provided with a wire casing, for putting short-circuit line 5, then by crimping, completes connection.
The invention provides a concrete example 220kV power transmission line three-phase shortcircuit operational method is described, its step includes:
1:, by calculating, select suitable short-circuit line, hole enlargement T-shape cable clamp and securing member.
When calculating generator group zero plays rising test, flow through the current value of short dot.When genset zero plays rising test I=100%If, stator current reaches 9296 peaces, the no-load voltage ratio K=15.942 of transformer, the electric current I d=9296/15.942=583(that flows through short dot during zero rising test pacifies).
220kV power transmission line model: LGJQT-1440
The short-circuit line adopting in work is steel-cored aluminium strand, and model is LGJ-400/50, and current-carrying capacity is 855 peaces, and short-circuit line meets genset zero and plays the requirement of rising test to current-carrying capacity.
According to the requirement of < < State Standard of the People's Republic of China T shape wire clamp GB/T 2340-1998 > >, adopt hole enlargement T-shape cable clamp that model is TLY-1440/400 that short-circuit line and three phase transmission line are linked together and make short dot.Model is
The applicable wire type (bus/downlead) of hole enlargement T-shape cable clamp of TLY-1440/400: LGJQT-1440/LGJ-400
Select bolt fastener model: M16 * 65mm(galvanizing) 8.8 grades.
2, instrument is suitably reequiped and is indicated:
Expand the bolt pickup groove of the hole enlargement T-shape cable clamp terminal strip that is arranged on B phase power transmission line top.With hammer, knock flat chisel the bolt pickup groove on terminal strip is expanded into sexangle, decapacitation makes outside nut can freely rotate, also should be able to use instrument clamp nut.
With flat file, remove the burr on hole enlargement T-shape cable clamp terminal strip.
Of red symbol pen, at the hole enlargement T-shape cable clamp terminal strip that expands groove, make the mark of " on B ".
3, make three-phase shortcircuit device: make short-circuit line, and short-circuit line and hole enlargement T-shape cable clamp are carried out to crimping.
The phase spacing of measuring three phase transmission line is 4 meters.
The steel-cored aluminium strand that to cut out lower two length and be 3.75 meters of models be LGJ-400/50 is as short-circuit line.
4, the pre-service of three phase transmission line:
With brass wire brush cleaning short-circuit line crimping place outside surface, then use alcohol cloth wiped clean.
Clean hole enlargement T-shape cable clamp aluminum tubular conductor inside surface.
With hydraulically operated equipment (HOE), the aluminum tubular conductor of short-circuit line two ends and hole enlargement T-shape cable clamp is carried out to crimping, hole enlargement T-shape cable clamp and short-circuit line crimping should meet technological requirement: crimp force >=80Mpa, reach after pressure pressure hold time >=15S, crimping length=120mm.
With frustrating cutter, remove the burr of hole enlargement T-shape cable clamp crimping place.
5, the concrete operation of 220kV power transmission line three-phase shortcircuit:
With brass wire brush, remove the oxide of three phase transmission line and hole enlargement T-shape cable clamp junction, and by alcohol cloth wiped clean.
With alcohol cloth, clean the inside surface that hole enlargement T-shape cable clamp contacts with power transmission line.
With aluminium armor tape in three phase transmission line and wire clamp junction colligation 20cm length;
Respectively the power transmission line of A, C phase is connected with the hole enlargement T-shape cable clamp on short-circuit line, with torque spanner by bolted.Tightening moment F=160Nm;
The power transmission line of B phase is connected with the hole enlargement T-shape cable clamp body on A, C phase short-circuit line, with torque spanner by bolted.Tightening moment F=160Nm.
This method can be carried out three-phase shortcircuit for the power transmission line of different electric pressures.
This device is only applicable to 220kV power transmission line and carries out three-phase shortcircuit, and the power transmission line applicable to different electric pressures after repacking carries out three-phase shortcircuit.
It is same as the prior art that the present invention does not state part.
Claims (2)
1.220kV power transmission line three-phase shortcircuit operational method, is characterized in that, comprises the steps:
Hole enlargement T-shape cable clamp, short-circuit line and securing member are provided, the conductor compression jointing portion that wherein hole enlargement T-shape cable clamp includes geometrical clamp, is connected with geometrical clamp, and the terminal strip being connected by securing member with geometrical clamp, geometrical clamp and terminal strip surround and form a circular opening, to clamp and fixing power transmission line;
Two cover short-circuiting means are provided, every cover short-circuiting means forms by two hole enlargement T-shape cable clamps and a short-circuit line, the both ends of short-circuit line are connected to respectively to conductor compression jointing portion, one of them hole enlargement T-shape cable clamp of first set short-circuiting means is referred to as to A phase wire clamp, another hole enlargement T-shape cable clamp is referred to as AB phase wire clamp, one of them hole enlargement T-shape cable clamp of the second cover short-circuiting means is referred to as to C phase wire clamp, and another hole enlargement T-shape cable clamp is referred to as CB phase wire clamp, with corresponding three-phase line, is described;
First with brass wire brush, remove the oxide of three phase transmission line and hole enlargement T-shape cable clamp junction, and by alcohol cloth wiped clean; With alcohol cloth, clean the inside surface that hole enlargement T-shape cable clamp contacts with power transmission line again; Finally use aluminium armor tape in the length of three phase transmission line and hole enlargement T-shape cable clamp junction colligation 20cm, complete connection pre-service;
A phase wire clamp is connected with A phase power transmission line: A phase power transmission line is placed in the circular opening of wire clamp, then by securing member, geometrical clamp and terminal strip is fastenedly connected;
Same operation C phase wire clamp is connected with C phase power transmission line, then AB phase wire clamp and CB phase wire clamp is all connected on B phase power transmission line, in upper and lower stacked mode, distributes; Completing short circuit connects.
2. 220kV power transmission line three-phase shortcircuit operational method according to claim 1, is characterized in that, by AB phase wire clamp and BC phase wire clamp meta, the terminal strip bolt pickup groove on the wire clamp of B phase power transmission line top is expanded into sexangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310735945.3A CN103675681A (en) | 2013-12-29 | 2013-12-29 | 220kV power transmission line three-phase short-circuit operating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310735945.3A CN103675681A (en) | 2013-12-29 | 2013-12-29 | 220kV power transmission line three-phase short-circuit operating method |
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| CN103675681A true CN103675681A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310735945.3A Pending CN103675681A (en) | 2013-12-29 | 2013-12-29 | 220kV power transmission line three-phase short-circuit operating method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417918Y (en) * | 2008-12-09 | 2010-03-03 | 甘肃省电力公司兰州超高压输变电公司 | 750kV high-altitude large-cross-section wire combination type T-shaped wire clamp |
| CN201435464Y (en) * | 2009-06-30 | 2010-03-31 | 中国电力工程顾问集团公司 | T-type wire clip, 4-bundle wire clip and 8-bundle wire clip used for UHV (ultra-high voltage) substation |
| CN202586173U (en) * | 2012-05-26 | 2012-12-05 | 国家电网公司 | Quick-connecting tubular cable clamp |
| CN202930884U (en) * | 2012-11-29 | 2013-05-08 | 南京特瑞线路器材有限公司 | Ice-melting short circuit fitting |
-
2013
- 2013-12-29 CN CN201310735945.3A patent/CN103675681A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417918Y (en) * | 2008-12-09 | 2010-03-03 | 甘肃省电力公司兰州超高压输变电公司 | 750kV high-altitude large-cross-section wire combination type T-shaped wire clamp |
| CN201435464Y (en) * | 2009-06-30 | 2010-03-31 | 中国电力工程顾问集团公司 | T-type wire clip, 4-bundle wire clip and 8-bundle wire clip used for UHV (ultra-high voltage) substation |
| CN202586173U (en) * | 2012-05-26 | 2012-12-05 | 国家电网公司 | Quick-connecting tubular cable clamp |
| CN202930884U (en) * | 2012-11-29 | 2013-05-08 | 南京特瑞线路器材有限公司 | Ice-melting short circuit fitting |
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Application publication date: 20140326 |
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