CN102611061B - Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) - Google Patents
Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) Download PDFInfo
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- CN102611061B CN102611061B CN201210064756.3A CN201210064756A CN102611061B CN 102611061 B CN102611061 B CN 102611061B CN 201210064756 A CN201210064756 A CN 201210064756A CN 102611061 B CN102611061 B CN 102611061B
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Abstract
The invention discloses a single-pole ground loop type direct-current deicing method for an overhead ground wire and an OPGW (optical fiber composite overhead ground wire). The overhead ground wire and the OPGW to be deiced are subjected to insulation modification, namely the overhead ground wire and the OPGW are not in direct grounded operation. An anode of a direct-current deicing device is connected to a deicing circuit, and a cathode of the direct-current deicing device is connected to a wire outlet terminal tower of a substation or a grounded mesh of the substation. The direct-current deicing method has the advantages that remote deicing is completed by making full use of capacity of the direct-current deicing device while the overhead ground wire and the OPGW are deiced, and electrified deicing of electric transmission wires is realized.
Description
Technical field
The present invention relates to the method for overhead ground wire and OPGW optical cable DC ice melting, be particularly useful for the ice-melt in the charged situation of transmission pressure and remote de-icing method technical field.
Background technology
When the icing on overhead ground wire acquires a certain degree, can cause that ground wire breaks, gold utensil comes off, Insulator detection etc., directly cause fractureing, collapse or due to sag not enough in line discharge.Because current power telecom network is compounded in overhead ground wire, if do not have effective ice-melt means, ground thread breakage will cause power communication channel to be interrupted, and jeopardize the normal operation of electric control system.
At present, achieve certain economic effect to transmission pressure DC ice melting, DC ice melting technology overcomes and exchanges ice-melt restriction, and during DC ice melting, the perceptual weight of line impedance is inoperative, greatly reduces the capacity needed for DC ice melting, improves ice-melt efficiency; Direct voltage continuously adjustabe during DC ice melting, by adjustment VD, can meet the ice-melt requirement of different length circuit, and not need to carry out impedance matching, greatly reduce the rigors of ice-melt to power system operation mode; The DC de-icing device being installed on load-center substation can carry out ice-melt work to all lines in full station, have accumulated abundant practical experience to carrying out DC ice melting.
Transmission pressure DC ice melting technology is introduced in overhead ground wire ice-melt, the ice-melting mode of being connected with an overhead ground wire by the ice-melting mode of two ground wires " 1+1 " or transmission pressure can solve the ice-melt of overhead ground wire and OPGW optical cable, but " 1+1 " ice-melting mode differs greatly due to overhead ground wire and OPGW optical cable resistance value, the scope of application reduces greatly, and overhead ground wire resistance value is comparatively large, the requirement that ice-melt distance is shorter and higher to the proposition of DC de-icing device capacity; Though the ice-melting mode that transmission pressure is connected with an overhead ground wire effectively can solve the problem of remote ice-melt, but requires transmission pressure power failure ice-melt.
Summary of the invention
In order to overcome the deficiency of overhead ground wire and the remote ice-melt of OPGW optical cable and charged ice-melt simultaneously, the present invention proposes the direct current ice melting method of single-stage ground return circuit, this de-icing method can make full use of the ice-melt that DC de-icing device capacity completes remote overhead ground wire and OPGW optical cable, and can realize the charged ice-melt of transmission pressure.
The technical scheme of patent direct current ice melting method of the present invention is: overhead ground wire and OPGW optical cable single-stage ground return circuit direct current ice melting method, the present invention carries out insulating transformation to the overhead ground wire and OPGW optical cable line segment of implementing DC ice melting, by overhead ground wire and the not directly ground connection operation of OPGW optical cable; The positive pole of DC de-icing device is connected in DC ice-melting, on the terminal tower that negative pole is connected to transformer station's outlet or substation grounding online, when DC de-icing device negative pole connects grounding net of transformer substation, should consider whether ice melting current affects life-span and the fail safe of ground network to the extent of corrosion of ground network, loop is formed with the earth, according to the minimum ice melting current value determined, steady up-flow, realizes overhead ground wire and the ice-melt of OPGW optical cable.
Patent direct current ice melting method beneficial effect of the present invention is, while achieving overhead ground wire and the ice-melt of OPGW optical cable, makes full use of DC de-icing device capacity and completes remote ice-melt, and can realize the charged ice-melt of transmission pressure.
Below in conjunction with the drawings and specific embodiments, the present invention is further explained.
Accompanying drawing explanation
Fig. 1 is the single ground wire deicing design sketch of negative pole when being connected with terminal tower;
Fig. 2 is ground wire with the OPGW optical cable in parallel ice-melt design sketch of negative pole when being connected with terminal tower;
Fig. 3 is the single ground wire deicing design sketch of negative pole when being connected with grounding net of transformer substation;
Fig. 4 is ground wire with the OPGW optical cable in parallel ice-melt design sketch of negative pole when being connected with grounding net of transformer substation.
Embodiment
Overhead ground wire and OPGW optical cable single-stage ground return circuit direct current ice melting method, the present invention carries out insulating transformation to the overhead ground wire and OPGW optical cable line segment of implementing DC ice melting, by overhead ground wire and the not directly ground connection operation of OPGW optical cable; The positive pole of DC de-icing device is connected in DC ice-melting, on the terminal tower that negative pole is connected to transformer station's outlet or substation grounding online, when DC de-icing device negative pole connects grounding net of transformer substation, should consider whether ice melting current affects life-span and the fail safe of ground network to the extent of corrosion of ground network, loop is formed with the earth, according to the minimum ice melting current value determined, steady up-flow, realizes overhead ground wire and the ice-melt of OPGW optical cable.Be specially:
(1) overhead ground wire and the OPGW optical cable line segment of implementing DC ice melting is determined;
(2) overhead ground wire and all models of OPGW optical cable in this line segment, the resistance value of model, ice covering thickness, geographical environment (wind speed, intensity of sunshine) technical parameter residing for line segment is collected;
(3) according to collected technical parameter data, the minimum ice melting current value of each model under different ice covering thickness, wind speed, intensity of sunshine, heat-stable current value (maximum permissible current value) is calculated;
(4) the minimum ice melting current value of whole piece line segment is determined, minimum ice melting current value meets principle: the minimum ice melting current value being more than or equal to all models on line segment, be less than or equal to the heat-stable current value of all models on line segment, replacing process is carried out to the overhead ground wire and OPGW optical cable that do not meet principle;
(5) except line end tower, insulating transformation is carried out to all the other shaft towers, its overhead ground wire and OPGW optical cable are insulated with the earth;
(6) pole tower ground resistance value and the soil resistivity of the non-insulating transformation of whole piece circuit is measured;
(7) resistance value not considering ice-melt line segment is collected;
(8) resistance value not considering ice-melt line segment that the pole tower ground resistance value of the non-insulating transformation that the minimum ice melting current value determining to obtain according to step (4), step (6) obtain and soil resistivity, step (7) obtain, calculates non-insulating and transforms the maximum stride voltage of every pole shaft tower, maximum touch voltage value and minimum safe distance;
(9) with human safety voltage 36V for the upper limit, according to maximum stride voltage, Maximum Contact voltage and minimum safe distance that step (8) calculates, consider that certain margin of safety (improves 20% of minimum ice melting current value, recalculate maximum stride voltage, Maximum Contact voltage and minimum safe distance), to the shaft tower exceeding more than safe voltage 36V, its earth electrode is transformed, reduce pole tower ground resistance value, or during ice-melt, security fence is set according to minimum safe distance, reduces personal electric shock risk;
(10) mode of connection of overhead ground wire and OPGW optical cable is determined;
(11) wiring;
(12) DC de-icing device is operated to minimum direct current electric current (50A) operating condition, stops 5-10 minute; Setting direct current lifting/lowering rate is on a workstation 20A/Min, and direct current instruction is that 100A stops 5-10 minute; Record the output voltage of DC de-icing device, power output and run Trigger Angle, comparing with calculated value, if error is within 5%, continuing up-flow, until reach minimum ice melting current;
(13) according to ice covering thickness and ice-melt time, suitably ice melting current is adjusted;
(14) ice-melt terminates, and closes DC de-icing device, and device and circuit recover original state before ice-melt.
Claims (1)
1. overhead ground wire and OPGW optical cable one pole ground return circuit direct current ice melting method, is characterized in that, carries out insulating transformation to the overhead ground wire and OPGW optical cable line segment implementing DC ice melting, by overhead ground wire and the not directly ground connection operation of OPGW optical cable; The positive pole of DC de-icing device is connected on described line segment, on the terminal tower that negative pole is connected to transformer station's outlet or substation grounding online; Concrete steps are:
(1) overhead ground wire and the OPGW optical cable line segment of implementing DC ice melting is determined;
(2) overhead ground wire and all models of OPGW optical cable in this line segment, the resistance value of model, ice covering thickness, geographical environment technical parameter residing for line segment is collected;
(3) according to collected technical parameter data, each model overhead ground wire and minimum ice melting current value, the heat-stable current value of OPGW optical cable under different ice covering thickness, wind speed, intensity of sunshine is calculated;
(4) the minimum ice melting current value of whole piece line segment is determined, minimum ice melting current value meets principle: the minimum ice melting current value being more than or equal to all model overhead ground wires and OPGW optical cable on line segment, be less than or equal to the heat-stable current value of all model overhead ground wires and OPGW optical cable on line segment, replacing process is carried out to the overhead ground wire and OPGW optical cable that do not meet principle;
(5) except line end shaft tower, insulating transformation is carried out to all the other shaft towers in line segment, its overhead ground wire and OPGW optical cable are insulated with the earth;
(6) pole tower ground resistance value and the soil resistivity of the non-insulating transformation of whole piece circuit is measured;
(7) resistance value that whole piece circuit does not consider ice-melt line segment is collected;
(8) determine to obtain the minimum ice melting current value of whole piece line segment according to step (4), the resistance value not considering ice-melt line segment that the pole tower ground resistance value of non-insulating transformation that step (6) obtains and soil resistivity, step (7) obtain, calculate non-insulating and transform the maximum stride voltage of every grade of shaft tower, maximum touch voltage value and minimum safe distance;
(9) with human safety voltage 36V for the upper limit, according to maximum stride voltage, Maximum Contact voltage and minimum safe distance that step (8) calculates, consider certain margin of safety, maximum stride voltage or Maximum Contact voltage are exceeded to the shaft tower of more than safe voltage 36V, its earth electrode is transformed, reduce pole tower ground resistance value, or during ice-melt, security fence is set according to minimum safe distance, reduce personal electric shock risk;
(10) mode of connection of overhead ground wire and OPGW optical cable is determined;
(11) wiring;
(12) DC de-icing device is operated to minimum direct current electric current: 50A operating condition, stops 5-10 minute; Setting direct current lifting/lowering rate is on a workstation 20A/Min, and direct current instruction is that 100A stops 5-10 minute; Record the output voltage of DC de-icing device, power output and run Trigger Angle, comparing with calculated value, if error is within 5%, continuing up-flow, until reach the minimum ice melting current value of whole piece line segment;
(13) according to ice covering thickness and ice-melt time, the suitably direct current of adjustment DC de-icing device;
(14) ice-melt terminates, and closes DC de-icing device, and DC de-icing device and whole piece circuit recover original state before ice-melt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210064756.3A CN102611061B (en) | 2012-03-13 | 2012-03-13 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210064756.3A CN102611061B (en) | 2012-03-13 | 2012-03-13 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
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| CN102611061A CN102611061A (en) | 2012-07-25 |
| CN102611061B true CN102611061B (en) | 2015-06-24 |
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| CN201210064756.3A Active CN102611061B (en) | 2012-03-13 | 2012-03-13 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856869B (en) * | 2012-08-30 | 2015-06-17 | 中国电力工程顾问集团西南电力设计院有限公司 | Wiring method for realizing direct-current deicing of ground wire of converter station |
| CN103116114B (en) * | 2013-01-23 | 2015-08-19 | 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 | Fault distance-finding method under a kind of DC de-icing device ground wire deicing pattern and system |
| CN103363914B (en) * | 2013-06-28 | 2016-04-20 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of transmission pressure ice covering monitoring system adopting OPGW data to transmit |
| CN104332929A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Single-ground wire ice melting method |
| CN105262001A (en) * | 2015-11-24 | 2016-01-20 | 国网四川省电力公司电力科学研究院 | Ice melting method for overhead ground wire of power transmission line |
| CN105826860A (en) * | 2016-05-04 | 2016-08-03 | 国网新疆电力公司哈密供电公司 | Method for melting ice and snow of transmission line |
| CN111463736A (en) * | 2020-05-08 | 2020-07-28 | 国网湖北省电力有限公司 | Direct ground wire grounding ice melting method |
| CN112054465B (en) * | 2020-07-22 | 2022-01-21 | 广东顺德电力设计院有限公司 | OPGW ice melting system |
| CN113541036B (en) * | 2021-05-27 | 2023-07-25 | 国网浙江省电力有限公司台州供电公司 | OPGW optical cable direct current ice melting system capable of monitoring in real time |
| CN115296246B (en) * | 2022-08-26 | 2024-05-28 | 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 | High-voltage direct-current uninterrupted ground wire ice melting circuit, equipment and operation method |
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