CN105655040A - Method for preventing heating of single-core power cable - Google Patents
Method for preventing heating of single-core power cable Download PDFInfo
- Publication number
- CN105655040A CN105655040A CN201410713985.2A CN201410713985A CN105655040A CN 105655040 A CN105655040 A CN 105655040A CN 201410713985 A CN201410713985 A CN 201410713985A CN 105655040 A CN105655040 A CN 105655040A
- Authority
- CN
- China
- Prior art keywords
- cable
- core
- bridge
- testing bridge
- bridge stand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention provides a method for preventing heating of a single-core power cable. An aluminium ladder-shaped cable bridge stand is manufactured and employed; for a single-core cable, one part of a high-voltage cabinet terminal is grounded; a grounding wire of the length of 40 to 60 mm is installed at a cable bridge stand connection part and grounding wires with lengths of 40 to 60 mm are used for connection between cable bridge stand brackets and the bridge stand; and all cables are placed on the same layer of the cable bridge stand by a single-layer laying way and are arranged linearly side by side in an A-phase, B-phase, and C-phase mode, wherein a distance between centers of each two adjacent cable doubles the external diameter of the cable. With the method, a heating problem of a single-core cable is solved; and the operating temperature of the cable can be guaranteed to be below 60 DEG C and is lower than a standard value of the maximum temperature of 90 DEG C for long-term operation of the cable. Therefore, the service life of the cable is prolonged; the operation cost is lowered; and the long-term, secure, and stable operation of the cable is guaranteed.
Description
Technical field
The invention belongs to electric protection device field, it is specifically related to a kind of for preventing the method for single core power electric cable heating.
Background technology
Single core power cable meeting and cable shield generation electromagnetic induction in operational process that cross section is bigger, thus produce induced current at screen layer, the material usually selected due to cable testing bridge is irony, it is easy to produce eddy-current heating on crane span structure. When single-core cable working current is bigger, very big current can be produced at screen layer, make electric cable heating serious, and cause eddy-current heating. To sum up two kinds of reasons, cause cable work and envrionment temperature higher than the highest long-term permission working temperature 90 DEG C of standard values of cable, and long-time running can damage cable insulation, causes short circuit, blows out, even presence of fire accident, and equipment forms great potential safety hazard.
For 1580mm hot rolling dynamic passive compensation system, there is following defect in its TCR cable running:
1, the type selecting of cable testing bridge is groove formula cable testing bridge, and this specification cable testing bridge radiating effect is poor, and groove formula cable testing bridge shield effectiveness is better simultaneously, it is easy to produces induced current, causes eddy-current heating, be not suitable for and lay the bigger power cable of working current.
2, the material of cable testing bridge is irony, when the cable current that inside is laid is bigger, it is easy to produce bigger inductive emf on cable testing bridge, thus produces bigger induced current.
3, cable testing bridge is without obvious ground connection, and stake resistance is bigger.
4, cable testing bridge inside cable is that Multi-stacking compaction is put, and is unfavorable for the heat radiation of cable.
When TCR electric current is bigger, TCR cable prevailing temperature is at 110 DEG C, and cable testing bridge temperature is at 130 DEG C, and the highest transient temperature in poor position of dispelling the heat reaches more than 200 DEG C, and the highest permission working temperature of cable long-time running is 90 DEG C, and cable insulation causes very big destruction.
Summary of the invention
Prevent the method for single core power electric cable heating it is desirable to provide a kind of, thus reduce the heating of single-core cable, make cable operate in less than 60 DEG C, extend cable work-ing life, it is ensured that cable long-term safety steady running.
For reaching this object, this invention takes following technical solution:
A kind of method preventing single core power electric cable heating, it is characterised in that:
1, make aluminium matter ladder-shaped cable bridge: cable testing bridge is made up of side plate, backboard, crossbeam and rivet, is provided with crossbeam between two side plates, side plate length direction by backboard together with rivet interlacement.
2, single-core cable is taked high pressure tank end one place ground connection, and the induction voltage reducing the generation of single-core cable screen layer is poor.
3,40��60mm grounding wire is installed in cable testing bridge junction, and adopts 40��60mm grounding wire to be connected between each bridge support for electric cable with crane span structure.
4, taking individual layer to lay on whole cable to be placed on same layer cable testing bridge, and press A, B, C three-phase and arrange in a word side by side, adjacent Liang Gen cable center distance is 1 times of outside diameter of cable.
The useful effect of the present invention is:
The invention solves the heating problem of single-core cable, can ensure that the operating temperature of cable is below 60 DEG C, be less than the standard value of cable long-time running top temperature 90 DEG C, thus extend cable work-ing life, reduce running cost, it is ensured that cable can the stable operation of long-term safety.
Accompanying drawing explanation
Fig. 1 is cable testing bridge structural representation;
Fig. 2 is that cable is put and grounding connection mode schematic diagram.
In figure: the indirect ground wire 8 of side plate 1, crossbeam 2, rivet 3, backboard 4, bracket 5, three-phase cable 6, junction grounding wire 7, bridge.
Embodiment
The present invention prevents the concrete grammar of single core power electric cable heating from being:
1, make and adopt aluminium matter ladder-shaped cable bridge. As seen from Figure 1, described aluminium matter ladder-shaped cable bridge specification is 2000 �� 600 �� 60mm, adopts the thick aluminium sheet of 3mm as side plate 1, connects and adopt aluminium matter rivet 3, and crane span structure connects the white steel screw of employing. Being provided with crossbeam 2 between two side plates 1, side plate length direction is fixed together by backboard 3 and rivet 3.
Owing to the original zinc-plated crane span structure of groove formula is replaced by the trapezoidal crane span structure of aluminium matter, and aluminum metal is nonferromagnetic material, and during single-core cable operation at rating, cable testing bridge there will not be eddy-current heating phenomenon. Owing to aluminum metal is high thermally conductive material, its thermal conductivity is 237W/mK, and the thermal conductivity of iron is 80W/mK, cable contacts with crane span structure after normally generating heat, aluminium matter crane span structure can play the effect of scatterer, and trapezoidal crane span structure adds the contact surface of cable and air, enhance radiating effect when identical ventilation heat exchange.
2, single-core cable is taked high pressure tank end one place ground connection. Changing single core power cable into high pressure tank end one place ground connection by original high pressure tank end and equipment end two ground connection, the induction voltage reducing the generation of single-core cable screen layer is poor, avoids producing circulation at cable shield, reduces electric cable heating.
3,40��60mm junction grounding wire 7 is installed in cable testing bridge junction, and be connected with adopting the indirect ground wire 8 of 40��60mm bridge between cable testing bridge at each bridge support for electric cable 5, improving the reliability of cable testing bridge ground connection, through measuring, the resistance between crane span structure and crane span structure counterpoise grounding is 0 ohm.
4, taking individual layer to lay on whole cable to be placed on same layer cable testing bridge, and press A, B, C three-phase cable 6 and arrange in a word side by side, adjacent Liang Gen cable center distance is 1 times of outside diameter of cable, strengthens radiating effect under ventilation state.
Claims (1)
1. one kind prevents the method for single core power electric cable heating, it is characterised in that:
(1) make aluminium matter ladder-shaped cable bridge: cable testing bridge is made up of side plate, backboard, crossbeam and rivet, is provided with crossbeam between two side plates, side plate length direction by backboard together with rivet interlacement;
(2) single-core cable is taked high pressure tank end one place ground connection, and the induction voltage reducing the generation of single-core cable screen layer is poor;
(3) 40��60mm grounding wire is installed in cable testing bridge junction, and adopts 40��60mm grounding wire to be connected between each bridge support for electric cable with crane span structure;
(4) taking individual layer to lay on whole cable to be placed on same layer cable testing bridge, and press A, B, C three-phase and arrange in a word side by side, adjacent Liang Gen cable center distance is 1 times of outside diameter of cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410713985.2A CN105655040A (en) | 2014-12-01 | 2014-12-01 | Method for preventing heating of single-core power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410713985.2A CN105655040A (en) | 2014-12-01 | 2014-12-01 | Method for preventing heating of single-core power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105655040A true CN105655040A (en) | 2016-06-08 |
Family
ID=56480414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410713985.2A Pending CN105655040A (en) | 2014-12-01 | 2014-12-01 | Method for preventing heating of single-core power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105655040A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641051A (en) * | 2020-06-11 | 2020-09-08 | 上海外高桥造船有限公司 | Outdoor metal cable bracket's ground system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2362216Y (en) * | 1999-03-05 | 2000-02-02 | 裘樟樵 | Cable bridge trough |
| US7560644B2 (en) * | 2007-11-19 | 2009-07-14 | Luse Thermal Technologies, LLC | Passive fire protection system for energized electric utility facilities and method of installation |
| CN201606572U (en) * | 2010-01-11 | 2010-10-13 | 深圳市比克电池有限公司 | Cable bridge supporting device |
| CN201779362U (en) * | 2010-07-05 | 2011-03-30 | 上海宝钢化工有限公司 | Cable bridge-to-home device |
| CN202469241U (en) * | 2012-03-16 | 2012-10-03 | 徐怀书 | Metallic anticorrosive assembled cable bridge |
| CN202597903U (en) * | 2012-01-13 | 2012-12-12 | 山东衡达有限责任公司 | Light-duty and high-strength plastic steel composite cable bridge rack |
| CN203147037U (en) * | 2013-02-19 | 2013-08-21 | 安徽精工电缆桥架有限公司 | Trapezoid special-shaped elbow for cable bridge |
| CN104100770A (en) * | 2014-06-26 | 2014-10-15 | 镇江市江岛电器制造有限公司 | Cable bridge ceiling hoisting mechanism |
-
2014
- 2014-12-01 CN CN201410713985.2A patent/CN105655040A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2362216Y (en) * | 1999-03-05 | 2000-02-02 | 裘樟樵 | Cable bridge trough |
| US7560644B2 (en) * | 2007-11-19 | 2009-07-14 | Luse Thermal Technologies, LLC | Passive fire protection system for energized electric utility facilities and method of installation |
| CN201606572U (en) * | 2010-01-11 | 2010-10-13 | 深圳市比克电池有限公司 | Cable bridge supporting device |
| CN201779362U (en) * | 2010-07-05 | 2011-03-30 | 上海宝钢化工有限公司 | Cable bridge-to-home device |
| CN202597903U (en) * | 2012-01-13 | 2012-12-12 | 山东衡达有限责任公司 | Light-duty and high-strength plastic steel composite cable bridge rack |
| CN202469241U (en) * | 2012-03-16 | 2012-10-03 | 徐怀书 | Metallic anticorrosive assembled cable bridge |
| CN203147037U (en) * | 2013-02-19 | 2013-08-21 | 安徽精工电缆桥架有限公司 | Trapezoid special-shaped elbow for cable bridge |
| CN104100770A (en) * | 2014-06-26 | 2014-10-15 | 镇江市江岛电器制造有限公司 | Cable bridge ceiling hoisting mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641051A (en) * | 2020-06-11 | 2020-09-08 | 上海外高桥造船有限公司 | Outdoor metal cable bracket's ground system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201773637U (en) | Composite insulating tubular bus | |
| CN202749143U (en) | Pipe-type cable | |
| CN104269794A (en) | All-insulation poured bus | |
| CN104835575A (en) | Anticorrosion low temperature resistant industrial cable | |
| CN103219689A (en) | Porcelain sleeve type cable terminal | |
| CN201465641U (en) | Electric power cable | |
| CN103366872A (en) | Circular shielding insulating bus and machining method thereof | |
| CN202584884U (en) | Insulation shielding type tubular bus | |
| CN105655040A (en) | Method for preventing heating of single-core power cable | |
| CN204189476U (en) | A kind of Split type equivalent potential screen cylinder isolated bus | |
| CN204189498U (en) | A kind of equivalent potential screen cylinder isolated bus | |
| CN204190317U (en) | All insulation cast bus | |
| CN203617656U (en) | Waterproof fire retarding busway | |
| CN204189483U (en) | A kind of organo montmorillonite epoxy resin equivalent potential screen cylinder insulation Split type bus | |
| CN202855396U (en) | Combined power transmission cable | |
| CN102354569A (en) | Diameter-expanding cable | |
| CN204189501U (en) | The insulation of a kind of organo montmorillonite epoxy resin equivalent potential screen cylinder is female | |
| CN201364758Y (en) | 10KV metal tube bus insulated and shielded by vulcanized silicon rubber | |
| CN103532068A (en) | Bus duct | |
| CN209844494U (en) | Insulating bus duct | |
| CN202905213U (en) | Aluminum alloy conductor variable-frequency cable | |
| CN203038684U (en) | Aluminium tube type cable used for conductor crosslinked polyethylene insulation winding | |
| CN105846374A (en) | Wall bushing with high dustproof capability | |
| CN204204493U (en) | A kind of cable of certainly lowering the temperature for steel works equipment | |
| Huang | Cause analysis and countermeasures of a breakdown failure of flexible 110 kV cable terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160608 |