CN116488096A - Uninterrupted ice melting circuit and circuit equipment for power grid transmission line - Google Patents

Uninterrupted ice melting circuit and circuit equipment for power grid transmission line Download PDF

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Publication number
CN116488096A
CN116488096A CN202310606922.6A CN202310606922A CN116488096A CN 116488096 A CN116488096 A CN 116488096A CN 202310606922 A CN202310606922 A CN 202310606922A CN 116488096 A CN116488096 A CN 116488096A
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CN
China
Prior art keywords
ice melting
ice
melting
switch
electrically connected
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Pending
Application number
CN202310606922.6A
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Chinese (zh)
Inventor
傅闯
王立平
任成林
李欢
魏伟
周月宾
许树楷
马晓红
孙鹏
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CSG Electric Power Research Institute
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CSG Electric Power Research Institute
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Application filed by CSG Electric Power Research Institute filed Critical CSG Electric Power Research Institute
Priority to CN202310606922.6A priority Critical patent/CN116488096A/en
Publication of CN116488096A publication Critical patent/CN116488096A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/16—Devices for removing snow or ice from lines or cables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Abstract

The application provides a power grid transmission line uninterrupted ice melting circuit and circuit equipment, wherein the power grid transmission line uninterrupted ice melting circuit comprises an alternating current power supply input end, an ice melting power supply and two voltage limiting high-resistance modules; the input end of the ice melting power supply is electrically connected with the input end of the alternating current power supply; the two voltage limiting high-resistance modules are a first voltage limiting high-resistance module and a second voltage limiting high-resistance module respectively, the first end of the first voltage limiting high-resistance module is electrically connected with the first end of the first ice melting bus, and the first end of the second voltage limiting high-resistance module is electrically connected with the first end of the second ice melting bus. By setting two voltage limiting high-resistance devices, the induced voltage on the ground wire or the lead wire to be thawed is reduced, so that the induced voltage is limited within the insulation level of the direct current side of the ice melting power supply, and the problem that the ice melting of the lead wire can be performed only when the power transmission line of the power grid is stopped in the existing scheme is solved.

Description

Uninterrupted ice melting circuit and circuit equipment for power grid transmission line
Technical Field
The application relates to the technical field of power transmission lines of power grids, in particular to a uninterrupted ice melting circuit and circuit equipment of a power transmission line of a power grid.
Background
Among various natural disasters suffered by the power system, ice disaster is one of the most serious threats, and ice coating damages power equipment and interrupts power supply, so that ice melting is necessary for an overhead line ground wire of the power system.
The prior scheme is as follows: the direct-current voltage range ultra-wide phase control rectification ice melting power supply and pulse width modulation ice melting power supply are used for switching in a lead wire to the ice melting power supply for ice melting after an ice coating circuit is stopped in an ice coating period, and the lead wire has to be cut off when ice is melted, but the circuit is not necessary when the lead wire is melted, and in addition, for a double-circuit (or multiple circuits in the same tower) circuit, the accompanying stop of other circuits is not necessary when ice is melted in one circuit, so that the problem of influence of induced voltage in the ice melting circuit when the circuit is not cut off is solved.
In the running process of the transmission line, a strong electromagnetic field is formed around the lead, and the overhead ground wire and other loop lines on the same tower are positioned in the electromagnetic field, so that induced voltage can be generated on the overhead ground wire and other loop lines on the same tower; the alternating current circuit mainly shows electromagnetic induction voltage and electrostatic induction voltage, and is mainly related to parameters such as circuit length, wire spacing, circuit height and the like of a circuit structure, the electromagnetic induction voltage is related to the current flowing through the induced circuit, and the electrostatic induction voltage is related to the voltage grade of the induced circuit; the DC circuit is mainly represented by electrostatic induction voltage and potential field caused by ion current generated by wire corona; in the case of a floating conductor or a grounded conductor via a large resistor in the vicinity of a dc transmission line, space charges moving onto such objects cannot flow directly into the ground in the dc ion flow field, which causes the objects to generate an induced voltage (i.e., a charging potential) that can be as high as several thousand volts. The ground wire to be thawed is in a suspending state and is a suspending conductor or a large-resistance grounding conductor, the ground wire to be thawed is also in a working state if the ground wire to be thawed is used as a deicing current path through a double-circuit direct current line of the same tower, the ground wire to be thawed is connected with the ice melting bus in the station through the shutdown wire or is in a working state, and if the voltage on the ice melting bus in the station exceeds the insulation level, the ice melting bus can be damaged.
The existing power transmission line of the power grid must be stopped (power cut) to melt ice on the ground wire, and the problem of the induced voltage in the ice melting loop is mainly solved.
Disclosure of Invention
The utility model provides a main aim at provides a power grid transmission line's uninterrupted ice melting circuit and circuit arrangement to at least, solve the problem that the power grid transmission line must stop the operation just can carry out the ice melting of leading ground wire in the current scheme.
In order to achieve the above object, according to one aspect of the present application, there is provided an uninterruptible ice melting circuit of a power grid transmission line, the uninterruptible ice melting circuit of the power grid transmission line including an ac power input terminal, an ice melting power source, and two voltage limiting high-resistance modules; the alternating current power supply input end is used for receiving input alternating current voltage; the ice melting power supply is provided with an input end, a first output end and a second output end, wherein the input end of the ice melting power supply is electrically connected with the input end of the alternating current power supply, the first output end of the ice melting power supply is electrically connected with the first end of a first ice melting bus, the second output end of the ice melting power supply is electrically connected with the first end of a second ice melting bus, the second end of the first ice melting bus and the second end of the second ice melting bus are respectively used for being electrically connected with a power grid transmission line, and the power grid transmission line is one of the following: overhead ground wires and wires to be thawed; the two voltage limiting high-resistance modules are a first voltage limiting high-resistance module and a second voltage limiting high-resistance module respectively, the first end of the first voltage limiting high-resistance module is electrically connected with the first end of the first ice melting bus, the first end of the second voltage limiting high-resistance module is electrically connected with the first end of the second ice melting bus, the second end of the first voltage limiting high-resistance module and the second end of the second voltage limiting high-resistance module are grounded respectively, wherein the first voltage limiting high-resistance module and the second voltage limiting high-resistance module are both used for reducing the induction voltage of the power grid power transmission line so as to limit the induction voltage in the insulation level of the direct current side of the ice melting power supply.
Optionally, the uninterrupted ice melting circuit of the power grid power transmission line further comprises a first source measurement ice melting switch, a second source measurement ice melting switch, a third source measurement ice melting switch, a fourth source measurement ice melting switch and a third voltage limiting high-resistance module, wherein a first end of the first source measurement ice melting switch is electrically connected with a first output end of the ice melting power supply and a first end of the second source measurement ice melting switch respectively, a second end of the first source measurement ice melting switch is electrically connected with a first end of the first ice melting bus, a first end of the third source measurement ice melting switch is electrically connected with a second output end of the ice melting power supply and a first end of the fourth source measurement ice melting switch respectively, a second end of the third source measurement ice melting switch is electrically connected with a second end of the second source measurement ice melting switch, a first end of the third ice melting bus and a first end of the third voltage limiting high-resistance module respectively, a second end of the fourth source measurement ice melting switch is electrically connected with a second end of the third voltage limiting high-resistance module, and the second end of the fourth source measurement ice melting switch is electrically connected with the first end of the power transmission line.
Optionally, the uninterrupted ice melting circuit of the power grid power transmission line further comprises a first line side ice melting switch, a second line side ice melting switch and a third line side ice melting switch, wherein a first end of the first line side ice melting switch is electrically connected with a second end of the first ice melting bus, the second line side ice melting switch is electrically connected with a second end of the second ice melting bus, the third line side ice melting switch is electrically connected with a second end of the third ice melting bus, and a second end of the first line side ice melting switch, a second end of the second line side ice melting switch and a second end of the third line side ice melting switch are respectively used for being electrically connected with one power grid power transmission line.
Optionally, the uninterrupted ice melting circuit of the power grid transmission line further comprises a first source measurement ice melting switch, a second source measurement ice melting switch and a fourth source measurement ice melting switch, the first source measurement ice melting switch is respectively and electrically connected with the first output end of the ice melting power supply and the first end of the second source measurement ice melting switch, the second end of the first source measurement ice melting switch is electrically connected with the first end of the first ice melting bus, the second end of the second source measurement ice melting switch is respectively and electrically connected with the first end of the fourth source measurement ice melting switch and the second output end of the ice melting power supply, and the second end of the fourth source measurement ice melting switch is electrically connected with the first end of the second ice melting bus.
Optionally, the resistance values of the first voltage-limiting high-resistance module, the second voltage-limiting high-resistance module and the third voltage-limiting high-resistance module are the same.
Optionally, the resistance value of the first voltage limiting high-resistance module is determined according to a resistance formula;
the resistance formula is as follows:
wherein R is min To preset the minimum value of the resistance, U Induced R is the induction voltage of the power transmission line of the power grid when being suspended 1 S is the resistance value of the first voltage limiting high-resistance module Induced And the induction capacity of the power transmission line of the power grid when the power transmission line is in suspension.
Optionally, the uninterrupted ice melting circuit of the power grid transmission line further comprises a circuit breaker, wherein a first end of the circuit breaker is electrically connected with the input end of the alternating current power supply, and a second end of the circuit breaker is electrically connected with the input end of the ice melting power supply.
Optionally, the uninterrupted ice melting circuit of the power grid transmission line further comprises an isolating switch, wherein a first end of the isolating switch is electrically connected with a second end of the circuit breaker, and a second end of the isolating switch is electrically connected with an input end of the ice melting power supply.
Optionally, the first voltage limiting high-resistance module comprises a plurality of resistors connected in series or in parallel in sequence.
According to another aspect of the application, a circuit device is provided, wherein the circuit device comprises any ice melting circuit of the power transmission line of the power grid.
By means of the technical scheme, the induced voltage on the ground wire or the lead to be de-iced is reduced by setting the two voltage limiting resistors, so that the induced voltage is limited in the insulation level of the direct current side of the de-icing power supply, the lead de-icing can be carried out without stopping the power transmission line of the power grid, and the problem that the lead de-icing can be carried out only by stopping the power transmission line of the power grid in the existing scheme is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 shows a schematic diagram of a first power grid transmission line uninterruptible ice melting circuit provided in accordance with embodiments of the present application;
fig. 2 shows a schematic diagram of a uninterruptible ice melting circuit of a second type of grid transmission line provided according to an embodiment of the present application;
FIG. 3 shows a schematic diagram of an uninterruptible ice melting circuit for a third grid power transmission line;
FIG. 4 shows a schematic diagram of an uninterruptible ice melting circuit for a fourth grid power transmission line;
FIG. 5 shows a schematic diagram of a fifth grid transmission line uninterruptible ice melting circuit;
FIG. 6 shows a schematic diagram of an uninterruptible ice melting circuit for a sixth grid power transmission line;
FIG. 7 shows a schematic diagram of a power outage-free ice melting circuit for a seventh grid power transmission line;
fig. 8 shows a schematic diagram of an uninterruptible ice melting circuit of an eighth grid transmission line.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For convenience of description, the following will describe some terms or terms related to the embodiments of the present application:
ice melting bus: one of the wires.
As described in the background art, during operation of the transmission line, a strong electromagnetic field is formed around the conductor, in which electromagnetic field the overhead ground wire and other loop lines on the same tower are subjected to, on which induced voltages are generated; the alternating current circuit is mainly represented by electromagnetic induction voltage and electrostatic induction voltage, and the electromagnetic induction voltage is mainly related to parameters such as circuit length, wire spacing, circuit height and the like of a circuit structure, the electromagnetic induction voltage is related to the current flowing through the induced circuit, and the electrostatic induction voltage is related to the voltage class of the induced circuit; the DC circuit is mainly represented by electrostatic induction voltage and potential field caused by ion current generated by wire corona; when a suspension conductor or a large-resistance grounding conductor exists near a direct-current transmission line, space charges moving to the object cannot directly flow into the ground in a direct-current ion flow field, so that the object generates induction voltage (namely charging potential) which can reach thousands of volts, the suspension conductor or the large-resistance grounding conductor is used when the ice-melting ground wire is suspended, the ice-melting ground wire is used as an ice-melting current passage through a double-circuit direct-current line shutdown wire on the same tower, whether the ice-melting ground wire is connected with an ice-melting bus in a station through the shutdown wire or not is used, the ice-melting bus possibly breaks if the voltage on the ice-melting bus in the station exceeds the insulation level of the ice-melting bus in the station, the existing power grid transmission line can conduct ice-melting by stopping (power failure) of the ground wire, and mainly the induction voltage problem existing in the ice-melting circuit is solved, and the embodiment of the application provides the uninterrupted ice-melting circuit and the power grid transmission line.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The application provides an uninterrupted ice melting circuit of a power grid transmission line, which is shown in fig. 1 and 2, and comprises an alternating current power INPUT end INPUT, an ice melting power Q1 and two voltage limiting high-resistance modules; the alternating current power supply INPUT end INPUT is used for receiving INPUT alternating current voltage; the ice melting power supply Q1 has an INPUT end, a first output end and a second output end, the INPUT end of the ice melting power supply Q1 is electrically connected with the INPUT end INPUT of the ac power supply, the first output end of the ice melting power supply Q1 is electrically connected with the first end of the first ice melting bus bar a1, the second output end of the ice melting power supply Q1 is electrically connected with the first end of the second ice melting bus bar c1, the second end of the first ice melting bus bar a1 and the second end of the second ice melting bus bar c1 are respectively used for being electrically connected with a power grid transmission line, and the power grid transmission line is one of the following: overhead ground wires and wires to be thawed; the two voltage limiting high-resistance modules are a first voltage limiting high-resistance module R1 and a second voltage limiting high-resistance module R2 respectively, the first end of the first voltage limiting high-resistance module R1 is electrically connected with the first end of the first ice melting bus a1, the first end of the second voltage limiting high-resistance module R2 is electrically connected with the first end of the second ice melting bus c1, the second end of the first voltage limiting high-resistance module R1 and the second end of the second voltage limiting high-resistance module R2 are grounded respectively, and the first voltage limiting high-resistance module R1 and the second voltage limiting high-resistance module R2 are both used for reducing the induction voltage on a ground wire or a lead to be melted so as to limit the induction voltage within the insulation level of the direct current side of the ice melting power supply Q1.
In the uninterrupted ice melting circuit of the power grid transmission line, the induced voltage on the ground wire or the lead to be melted is reduced by arranging the two voltage limiting resistors, so that the induced voltage is limited in the insulation level of the direct current side of the ice melting power supply, the lead ice melting can be carried out without stopping the power grid transmission line, and the problem that the lead ice melting can be carried out only by stopping the power grid transmission line in the existing scheme is solved.
When the ground wire of the alternating current transmission line is iced, the ground wire is subjected to the induction voltage of the operation wire, and after the ground wire is connected into the ice melting system, the induction voltage enables the insulation level of the ice melting system to exceed the allowable value, and after the voltage limiting high resistance is increased, the insulation level of the ice melting system can be ensured to exceed the design value.
In an embodiment of the present application, as shown in fig. 1, the uninterrupted ice-melting circuit of the power grid power transmission line further includes a first source-side ice-melting switch S1, a second source-side ice-melting switch S2, a third source-side ice-melting switch S3, a fourth source-side ice-melting switch S4, and a third voltage-limiting high-resistance module R3, where a first end of the first source-side ice-melting switch S1 is electrically connected to a first output end of the ice-melting power supply Q1 and a first end of the second source-side ice-melting switch S2, a second end of the first source-side ice-melting switch S1 is electrically connected to a first end of the first ice-melting bus bar a1, a first end of the third source-side ice-melting switch S3 is electrically connected to a second output end of the ice-melting power supply Q1 and a first end of the fourth source-side ice-melting switch S4, a second end of the third source-side ice-melting switch S3 is electrically connected to a second output end of the second source-side ice-melting switch S2 and a first end of the third source-side ice-melting switch S3, and a second end of the third source-side ice-melting switch S3 is electrically connected to a second end of the third power-side ice-melting bus bar R1 and a third end of the third source-side ice-melting switch R3 is electrically connected to a first end of the power-side ice-melting bus bar 1.
The source-measuring ice melting switch is used for realizing quick connection and disconnection of an ice melting power supply and an ice melting bus.
In an embodiment of the present application, as shown in fig. 1, the uninterruptible ice-melting circuit of the power grid power transmission line further includes a first line side ice-melting switch Sa, a second line side ice-melting switch Sc, and a third line side ice-melting switch Sb, where a first end of the first line side ice-melting switch Sa is electrically connected to a second end of the first ice-melting bus a1, the second line side ice-melting switch Sc is electrically connected to a second end of the second ice-melting bus c1, the third line side ice-melting switch Sb is electrically connected to a second end of the third ice-melting bus b1, and a second end of the first line side ice-melting switch Sa, a second end of the second line side ice-melting switch Sc, and a second end of the third line side ice-melting switch Sb are respectively electrically connected to one power grid power transmission line.
The wire side ice melting switch is used for realizing the quick connection of an ice melting power supply, a wire to be subjected to ice melting and a ground wire through an ice melting bus to form an ice melting current path, and the ice melting power supply is quickly disconnected after ice melting is completed.
In an embodiment of the present application, as shown in fig. 2, the uninterruptible ice melting circuit of the power grid power transmission line further includes a first source-measured ice melting switch S1, a second source-measured ice melting switch S2, and a fourth source-measured ice melting switch S4, where the first source-measured ice melting switch S1 is electrically connected to a first output end of the ice melting power supply Q1 and a first end of the second source-measured ice melting switch S2, a second end of the first source-measured ice melting switch S1 is electrically connected to a first end of the first ice melting bus a1, a second end of the second source-measured ice melting switch S2 is electrically connected to a first end of the fourth source-measured ice melting switch S4 and a second output end of the ice melting power supply Q1, and a second end of the fourth source-measured ice melting switch S4 is electrically connected to a first end of the second ice melting bus c 1.
Specifically, the source side ice melting switch, the line side ice melting switch and the ground wire ice melting switch have the capability of resisting induced voltage and switching small current, the induced voltage is the voltage after being connected to the voltage limiting resistor, the switching small current value is 1 to 25A, and the voltage limiting resistor is determined through formula estimation or numerical simulation calculation.
In an embodiment of the present application, the resistance values of the first voltage-limiting high-resistance module, the second voltage-limiting high-resistance module, and the third voltage-limiting high-resistance module are the same. The symmetry of the design of the ice melting circuit of the power grid transmission line is improved.
In an embodiment of the present application, a resistance value of the first voltage limiting high-resistance module is determined according to a resistance formula;
the resistance formula is as follows:
wherein R is min To preset the minimum value of the resistance, U Induced R is the induction voltage when the power transmission line of the power grid is in suspension 1 S is the resistance of the first voltage limiting high-resistance module Induced The induction capacity of the power transmission line of the power grid is the induction capacity when the power transmission line is in suspension.
Specifically, the minimum value of the preset resistance is 500kΩ, according to the induction voltage and the induction capacity of the power transmission line of the power grid when in suspension, the resistance value of the first voltage limiting high-resistance module can be obtained, and other voltage limiting high-resistance modules are similar, and the details are not repeated here, so that the induction voltage of the power transmission line of the power grid when in suspension and the induction capacity of the power transmission line of the power grid can be estimated through a formula or determined through numerical simulation calculation.
In an embodiment of the present application, as shown in fig. 1 and fig. 2, the uninterrupted ice melting circuit of the power transmission line of the power grid further includes a breaker QF, a first end of the breaker QF is electrically connected to the INPUT end INPUT of the ac power supply, and a second end of the breaker QF is electrically connected to the INPUT end of the ice melting power supply Q1.
Specifically, the circuit breaker is used for protecting the ice melting circuit of the power transmission line of the power grid.
In an embodiment of the present application, as shown in fig. 1 and fig. 2, the uninterrupted ice melting circuit of the power transmission line of the power grid further includes a disconnecting switch K, a first end of the disconnecting switch K is electrically connected to a second end of the circuit breaker QF, and a second end of the disconnecting switch K is electrically connected to an input end of the ice melting power supply Q1.
Specifically, the isolating switch is used for controlling whether the input voltage is connected into the ice melting power supply.
In one embodiment of the present application, the first voltage limiting high-resistance module includes a plurality of resistors connected in series or parallel in sequence.
As shown in fig. 3, the uninterrupted ice melting circuit of the power grid transmission line comprises a first source measurement ice melting switch S1, a second source measurement ice melting switch S2, a third source measurement ice melting switch S3, a fourth source measurement ice melting switch S4, a disconnecting switch K, a circuit breaker QF, ice melting buses (a 1, b1 and c 1), an alternating current power INPUT end INPUT, an ice melting power Q1, voltage limiting high-resistance (R1, R2 and R3), wires (a 2, b2 and c 2) and short-circuit switches (Sab and Sbc);
as shown in fig. 4, the uninterrupted ice melting circuit of the power grid transmission line includes a first source-side ice melting switch S1, a second source-side ice melting switch S2, a third source-side ice melting switch S3, a fourth source-side ice melting switch S4, a disconnecting switch K, a circuit breaker QF, ice melting buses (a 1, b1, c 1), an ac power INPUT, an ice melting power Q1, a voltage limiting high-resistance (R1, R2, R3), a first line-side ice melting switch Sa, a second line-side ice melting switch Sc, a third line-side ice melting switch Sb, and ground line ice melting switches (Sg 1, sg 2), and the current flows as follows: flows through the first output terminal of the ice melting power supply Q1, S1, a1, sa, sg1, sg2, sc, S4, and the second output terminal of the ice melting power supply Q1 in order.
As shown in fig. 5, the uninterrupted ice melting circuit of the power grid transmission line includes a first source-side ice melting switch S1, a second source-side ice melting switch S2, a fourth source-side ice melting switch S4, a disconnecting switch K, a circuit breaker QF, ice melting buses (a 1, c 1), an ac power INPUT terminal INPUT, an ice melting power Q1, voltage limiting high-resistance (R1, R2), a first line-side ice melting switch Sa, a second line-side ice melting switch Sc, and ground line ice melting switches (Sg 1, sg 2), and the current flows as follows: flows through the first output terminal of the ice melting power supply Q1, S1, a1, sa, sg1, sg2, sc, S4, and the second output terminal of the ice melting power supply Q1 in order.
As shown in fig. 6, the uninterrupted ice melting circuit of the power grid transmission line includes a first source-side ice melting switch S1, a second source-side ice melting switch S2, a third source-side ice melting switch S3, a fourth source-side ice melting switch S4, a disconnecting switch K, a circuit breaker QF, ice melting buses (a 1, b1, c 1), an ac power INPUT, an ice melting power Q1, a voltage limiting high-resistance (R1, R2, R3), a first line-side ice melting switch Sa, a second line-side ice melting switch Sc, a third line-side ice melting switch Sb, a ground wire ice melting switch (Sg 1, sg 2), wires (a 2, b2, c 2) and a shorting switch (Sab, sbc), and the current flows as follows: flows through the second output terminals of the ice-melting power supply Q1, S1, a1, sa, a2, sg1, sg2, c2, sc, S4 in order from the first output terminal of the ice-melting power supply Q1.
As shown in fig. 7, the uninterrupted ice melting circuit of the power grid transmission line includes a first source-side ice melting switch S1, a second source-side ice melting switch S2, a fourth source-side ice melting switch S4, a disconnecting switch K, a circuit breaker QF, ice melting buses (a 1, c 1), an ac power INPUT terminal INPUT, an ice melting power Q1, voltage limiting high-resistance (R1, R2), a first line-side ice melting switch Sa, a second line-side ice melting switch Sc, a third line-side ice melting switch Sb, ground line ice melting switches (Sg 1, sg 2) and wires (a 2, b2, c 2), and the current flows as follows: flows through the second output terminals of the ice-melting power supply Q1, S1, a1, sa, a2, sg1, sg2, c2, sc, S4 in order from the first output terminal of the ice-melting power supply Q1.
As shown in fig. 8, the uninterrupted ice melting circuit of the power grid transmission line includes a first source-side ice melting switch S1, a second source-side ice melting switch S2, a third source-side ice melting switch S3, a fourth source-side ice melting switch S4, a disconnecting switch K, a circuit breaker QF, ice melting buses (a 1, b1, c 1), an ac power INPUT, an ice melting power Q1, a voltage limiting high-resistance (R1, R2, R3), a first line-side ice melting switch Sa, a second line-side ice melting switch Sc, a third line-side ice melting switch Sb, conductors (a 2, b2, c 2), and a shorting switch (Sab, sbc), and the current flows as follows: flows through the second output terminals of the ice melting power source Q1 from the first output terminal of the ice melting power source Q1 in sequence S1, a1, sa, a2, sab, sbc, c2, sc, S4, or flows through the second output terminals of the ice melting power source Q1 from the first output terminal of the ice melting power source Q1 in sequence S2, b1, sb, b2, sbc, c2, sc, S4, or the second output terminal of the ice melting power source Q1.
The application also provides circuit equipment, which comprises any one of the uninterrupted ice melting circuits of the power grid transmission line. By setting two voltage limiting high-resistance devices, the induced voltage on the ground wire or the lead wire to be thawed is reduced, so that the induced voltage is limited within the insulation level of the direct current side of the ice melting power supply, the ground wire ice melting can be carried out without stopping the power transmission line of the power grid, and the problem that the ground wire ice melting can be carried out only when the power transmission line of the power grid is stopped in the existing scheme is solved.
It should be noted that the above electrical connection may be a direct electrical connection or an indirect electrical connection, where a direct electrical connection refers to a direct connection between two devices, and an indirect electrical connection refers to a connection between a and B, where other devices like capacitors and resistors are connected.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
1) According to the uninterrupted ice melting circuit of the power grid transmission line, the two voltage limiting high-resistance devices are arranged, the induced voltage on the ground wire or the lead wire to be melted is reduced, the induced voltage is limited in the insulation level of the direct current side of the ice melting power supply, the ground wire ice melting can be carried out without stopping the power grid transmission line, and the problem that the ground wire ice melting can be carried out only when the power grid transmission line is stopped in the existing scheme is solved.
2) The circuit equipment reduces the induced voltage on the ground wire or the lead wire to be thawed through setting two voltage limiting high resistances, so that the induced voltage is limited in the insulation level of the direct current side of the ice melting power supply, the ground wire ice melting can be carried out without stopping the power transmission line of the power grid, and the problem that the ground wire ice melting can be carried out only when the power transmission line of the power grid is stopped in the existing scheme is solved.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. The utility model provides a power grid transmission line's uninterrupted ice-melt circuit which characterized in that includes:
the alternating current power supply input end is used for receiving input alternating current voltage;
the ice melting power supply is provided with an input end, a first output end and a second output end, wherein the input end of the ice melting power supply is electrically connected with the input end of the alternating current power supply, the first output end of the ice melting power supply is electrically connected with the first end of a first ice melting bus, the second output end of the ice melting power supply is electrically connected with the first end of a second ice melting bus, the second end of the first ice melting bus and the second end of the second ice melting bus are respectively used for being electrically connected with a power grid transmission line, and the power grid transmission line is one of the following: overhead ground wires and wires to be thawed;
the two voltage limiting high-resistance modules are a first voltage limiting high-resistance module and a second voltage limiting high-resistance module respectively, the first end of the first voltage limiting high-resistance module is electrically connected with the first end of the first ice melting bus, the first end of the second voltage limiting high-resistance module is electrically connected with the first end of the second ice melting bus, the second end of the first voltage limiting high-resistance module and the second end of the second voltage limiting high-resistance module are grounded respectively, and the first voltage limiting high-resistance module and the second voltage limiting high-resistance module are both used for reducing the induction voltage of the power grid power transmission line so as to limit the induction voltage in the insulation level of the direct current side of the ice melting power supply.
2. The uninterruptible ice melting circuit of the power grid power transmission line according to claim 1, further comprising a first source-measured ice melting switch, a second source-measured ice melting switch, a third source-measured ice melting switch, a fourth source-measured ice melting switch and a third voltage limiting high-resistance module, wherein a first end of the first source-measured ice melting switch is electrically connected with a first output end of the ice melting power supply and a first end of the second source-measured ice melting switch respectively, a second end of the first source-measured ice melting switch is electrically connected with a first end of the first ice melting bus, a first end of the third source-measured ice melting switch is electrically connected with a second output end of the ice melting power supply and a first end of the fourth source-measured ice melting switch respectively, a second end of the third source-measured ice melting switch is electrically connected with a second end of the second source-measured ice melting switch, a first end of the third ice melting bus and a first end of the third voltage limiting high-resistance module respectively, a first end of the third ice melting bus is electrically connected with a third end of the ice melting power supply, and a third end of the third power supply is electrically connected with a third end of the ice melting bus.
3. The uninterruptible ice-melting circuit of a power grid power transmission line according to claim 2, further comprising a first line side ice-melting switch, a second line side ice-melting switch and a third line side ice-melting switch, wherein a first end of the first line side ice-melting switch is electrically connected with a second end of the first ice-melting bus bar, the second line side ice-melting switch is electrically connected with a second end of the second ice-melting bus bar, the third line side ice-melting switch is electrically connected with a second end of the third ice-melting bus bar, and the second end of the first line side ice-melting switch, the second end of the second line side ice-melting switch and the second end of the third line side ice-melting switch are respectively used for being electrically connected with one power grid power transmission line.
4. The uninterruptible ice melting circuit of the power grid power transmission line according to claim 1, further comprising a first source-measured ice melting switch, a second source-measured ice melting switch and a fourth source-measured ice melting switch, wherein the first source-measured ice melting switch is electrically connected with a first output end of the ice melting power supply and a first end of the second source-measured ice melting switch respectively, a second end of the first source-measured ice melting switch is electrically connected with a first end of the first ice melting bus, a second end of the second source-measured ice melting switch is electrically connected with a first end of the fourth source-measured ice melting switch and a second output end of the ice melting power supply respectively, and a second end of the fourth source-measured ice melting switch is electrically connected with a first end of the second ice bus.
5. The uninterruptible ice melting circuit of a power grid transmission line according to claim 2, wherein the first voltage limiting high-resistance module, the second voltage limiting high-resistance module and the third voltage limiting high-resistance module have the same resistance value.
6. The uninterruptible ice melting circuit of the power grid transmission line according to claim 2, wherein the resistance value of the first voltage limiting high-resistance module is determined according to a resistance formula;
the resistance formula is as follows:
wherein R is min To preset the minimum value of the resistance, U Induced R is the induction voltage of the power transmission line of the power grid when being suspended 1 S is the resistance value of the first voltage limiting high-resistance module Induced And the induction capacity of the power transmission line of the power grid when the power transmission line is in suspension.
7. The uninterruptible ice melting circuit of a power grid transmission line of claim 1, further comprising a circuit breaker, a first end of the circuit breaker being electrically connected to the ac power input, a second end of the circuit breaker being electrically connected to the input of the ice melting power source.
8. The uninterruptible ice melting circuit of a power grid transmission line of claim 7, further comprising a disconnector, a first end of the disconnector being electrically connected to a second end of the circuit breaker, a second end of the disconnector being electrically connected to an input of the ice melting power supply.
9. The uninterruptible ice melting circuit of a power grid transmission line of claim 1, wherein the first voltage limiting high resistance module comprises a plurality of resistors connected in series or in parallel in sequence.
10. A circuit device, comprising: ice melting circuit of a power grid transmission line according to any one of claims 1 to 9.
CN202310606922.6A 2023-05-25 2023-05-25 Uninterrupted ice melting circuit and circuit equipment for power grid transmission line Pending CN116488096A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310606922.6A CN116488096A (en) 2023-05-25 2023-05-25 Uninterrupted ice melting circuit and circuit equipment for power grid transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310606922.6A CN116488096A (en) 2023-05-25 2023-05-25 Uninterrupted ice melting circuit and circuit equipment for power grid transmission line

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CN116488096A true CN116488096A (en) 2023-07-25

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