Line loss on-line monitoring device and monitoring method thereof

Abstract

The application relates to the technical field of electric power, in particular to a line loss on-line monitoring device and a monitoring method thereof, which are used for monitoring line loss of overhead lines between power generation transformers and power consumption transformers and comprise a disc-shaped induction plate fixed on a power transmission tower, an induction coil arranged in the induction plate, a mounting hole arranged through the center of the induction plate, insulators for suspending overhead lines inserted into the mounting hole, a main controller electrically connected with the induction coil and arranged on the induction plate, and a communication antenna for uploading information data. The line loss on-line monitoring device and the monitoring method thereof can reduce errors by combining environmental information and can realize real-time monitoring of line loss of each section of overhead power transmission lines.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power, in particular to a line loss on-line monitoring device and a monitoring method thereof. BACKGROUND

[0002] Line loss is also called power loss of transmission line, which is a phenomenon that power loss occurs due to heating of overhead line itself due to its resistance during power transmission, thereby causing power loss. In addition, the internal resistance of the transformer also causes power loss.

[0003] At present, the transformer loss includes hysteresis loss, eddy current loss and winding resistance loss, which are less affected by environmental factors and can be obtained through pre-production detection. The overhead transmission line is obviously affected by the environment during operation and has a long distance, and its loss is indirectly obtained through metering and calculation.

[0004] Therefore, for the loss of overhead transmission line, the loss obtained by the conventional calculation method is large in error and poor in real-time. SUMMARY

[0005] In order to solve the technical problems in the background art, the present application provides a line loss on-line monitoring device and a monitoring method thereof, which reduces errors by combining environmental information and can monitor the line loss of each section of the overhead transmission line in real time.

[0006] The technical solution adopted by the present application is:

[0007] A line loss on-line monitoring device and a monitoring method thereof are used to monitor the line loss of the overhead line between the power generation transformer and the power consumption transformer, which comprises a disc-shaped induction plate fixed on the power transmission tower, an induction coil is arranged in the induction plate, a mounting hole is arranged in the center of the induction plate, an insulator for suspending and overhead line is inserted into the mounting hole, a main control unit electrically connected with the induction coil is arranged on the induction plate, and the main control unit comprises: a processing module for processing induction electric signal; a power module for converting induction electric into power supply; a position module for positioning; a temperature module for collecting and processing temperature signal; and a communication antenna for uploading information data.

[0008] Further, the information data M collected by the main control unit is uploaded through the communication antenna.

[0009] M=[U i , X, T],

[0010] Wherein:

[0011] U i is the induction voltage of the overhead line,

[0012] X is the position coordinate of the transmission line,

[0013] T is the temperature at the power transmission tower;

[0014] The position coordinate X in the formula is:

[0015] X = (N, E),

[0016] Wherein:

[0017] N is the latitude information,

[0018] E is the longitude information.

[0019] Further, according to the position coordinate X, the geographical coordinate Y of the coordinate point is: Y = [(X), H] = [(N, E), H],

[0020] Wherein:

[0021] N is the latitude information,

[0022] E is the longitude information,

[0023] H is the altitude.

[0024] Further, the overhead line length L is calculated by information data M N is:

[0025]

[0026] Wherein:

[0027] L N is the total length of the overhead line from the nth tower to the No. 1 tower on the side of the power generation transformer,

[0028] L i is the length of the overhead line between adjacent towers,

[0029] L0 is the length of the overhead line in the span.

[0030] Further, the overhead line between adjacent towers is suspended in a flat throwing manner, and the overhead line length L i is:

[0031] Wherein:

[0032] L is the span between adjacent towers,

[0033] g is the conductor specific load,

[0034] δ is the horizontal stress,

[0035] ΔH is the height difference of the suspension point, ΔH = 0 indicates that the suspension point has no height difference;

[0036] or the overhead line between adjacent towers is suspended in an inclined throwing manner, and the overhead line length L i is:

[0037]

[0038] wherein:

[0039] L is the span between adjacent towers,

[0040] g is the specific conductor load,

[0041] δ is the horizontal stress,

[0042] α is the height difference angle,

[0043] ΔH is the height difference of the suspension point, ΔH≠0 indicates that there is a height difference in the suspension point and is calculated by the height difference angle α. Further, the span L is:

[0044]

[0045] wherein:

[0046] ΔN is the difference in latitude between adjacent towers,

[0047] ΔE is the difference in longitude between adjacent towers;

[0048] The difference in latitude ΔN in the formula is:

[0049]

[0050] wherein:

[0051] Δn is the difference in latitude between adjacent towers,

[0052] R is the radius of the earth;

[0053] The difference in longitude ΔE in the formula is:

[0054]

[0055] wherein:

[0056] Δe is the difference in longitude between adjacent towers,

[0057] r is the radius of the longitudinal profile circle of the earth.

[0058] Further, the radius r of the longitudinal profile circle of the earth is:

[0059]

[0060] wherein:

[0061] is the average latitude between adjacent towers,

[0062] R is the radius of the earth;

[0063] The average latitude in the formula Is:

[0064]

[0065] Wherein:

[0066] E1, e2 is the latitude of adjacent tower.

[0067] Further, according to the length of overhead line L N , the resistance of overhead line Z is obtained as:

[0068]

[0069] Wherein:

[0070] P is the resistivity of overhead line,

[0071] S is the cross-sectional area of overhead line.

[0072] Further, according to the temperature T at the transmission tower, the specific values of resistivity p, conductor specific load g and horizontal stress δ are obtained,

[0073] Wherein:

[0074] The resistivity p is proportional to the temperature T,

[0075] The conductor specific load g is proportional to 1 / temperature T,

[0076] The horizontal stress δ is proportional to 1 / temperature T.

[0077] Further, according to the induced voltage U i of overhead line, the voltage drop △U of overhead line is obtained, and combined with the resistance Z of overhead line, the line loss power △P is obtained as:

[0078]

[0079] The line loss on-line monitoring device and the monitoring method have the beneficial effects:

[0080] Through information data, real-time environmental information, tower geographic location information and voltage drop information are obtained;

[0081] Through the geographic location information of tower, the length of overhead line between towers is accurately obtained, so as to obtain the resistance of overhead line, and combined with the voltage drop information, the real-time loss value is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0082] Figure 1 It is the monitoring device structure schematic diagram of the example of the application;

[0083] Figure 2 It is the monitoring device installation schematic diagram of the example of the application;

[0084] Figure 3 is a schematic diagram of power transmission of the present application.

[0085] in the figure:

[0086] 10, induction plate, 11, induction coil, 12, mounting hole, 13, main controller, 14, communication antenna,

[0087] 2, power generation transformer,

[0088] 3, power consumption transformer,

[0089] 4, power transmission tower, 41, insulator. DETAILED DESCRIPTION

[0090] In order to more clearly and explicitly illustrate the specific implementation purposes and implementation manners of the present application, the technical solutions of the present application will be described in detail below. The described embodiments are part of the embodiments of the present application, not all embodiments. Based on the described embodiments of the present application, all other embodiments within the scope of the present application belong to the protection scope of the present application without creative labor.

[0091] The present application is a kind of line loss on-line monitoring device, as shown in Figure 1 、 Figure 2 、 Figure 3 The line loss between the power generation transformer 2 and the power consumption transformer 3 is monitored, which includes: a disc-shaped induction plate 10 fixed on the power transmission tower 4, the induction plate 10 is provided with an induction coil 11, the central part of the induction plate 10 is provided with a mounting hole 12, the mounting hole 12 is inserted with an insulator 41 for suspending overhead line, the induction plate 10 is provided with a main controller 13 electrically connected with the induction coil 11; the main controller 13 includes: a processing module for processing induction electric signal; a power module for converting induction electric into power supply; a positioning module for positioning; a temperature module for collecting and processing temperature signal; a communication antenna 14 for uploading information data.

[0092] According to the specific structure of the line loss on-line monitoring device in the above embodiment, the monitoring method of the line loss on-line monitoring device will be further described below:

[0093] S1, the information data M collected by the main controller 13 is uploaded through the communication antenna 14:

[0094] M=[U i , X, T],

[0095] In the formula:

[0096] U i is the induction voltage of the overhead line;

[0097] X is the position coordinate of the transmission line;

[0098] T is the temperature at the transmission tower 4.

[0099] The position coordinate X is:

[0100] X = N, E,

[0101] N is the latitude information;

[0102] E is the longitude information.

[0103] S2, according to the position coordinate X, the geographical coordinate Y of the coordinate point is obtained:

[0104] Y = [(X), H] = [(N, E), H],

[0105] In the formula:

[0106] N is the latitude information;

[0107] E is the longitude information;

[0108] H is the altitude.

[0109] S3, calculate the overhead line length L through the information data M N :

[0110]

[0111] In the formula:

[0112] L N is the total length of the overhead line from the nth tower to the No. 1 tower on the side of the power transformer 2;

[0113] L i is the overhead line length between adjacent towers;

[0114] L0 is the overhead line length in the span.

[0115] S4, calculate the overhead line length L between adjacent towers i , including:

[0116] S41, the overhead line between adjacent towers is suspended in a parabolic manner, and the overhead line length L i is:

[0117]

[0118] In the formula:

[0119] L is the span between adjacent towers;

[0120] g is the conductor specific load;

[0121] δ is the horizontal stress;

[0122] AH is the height difference of the suspension point, AH = 0 indicates that the suspension point has no height difference.

[0123] S42, the overhead line between adjacent towers is suspended in an oblique throwing manner, and the length of the overhead line L i is:

[0124]

[0125] In the formula:

[0126] L is the span between adjacent towers;

[0127] g is the specific load of the conductor;

[0128] δ is the horizontal stress;

[0129] α is the height difference angle;

[0130] AH is the height difference of the suspension point, AH ≠ 0 indicates that the suspension point has a height difference, and is calculated by the height difference angle α.

[0131] S5, the span L is calculated as:

[0132]

[0133] In the formula:

[0134] ΔN is the latitude distance difference between adjacent towers;

[0135] ΔE is the longitude distance difference between adjacent towers.

[0136] The latitude distance difference ΔN in the formula is:

[0137]

[0138] The longitude distance difference ΔE in the formula is:

[0139]

[0140] Where:

[0141] Δn is the latitude difference between adjacent towers;

[0142] Δe is the longitude difference between adjacent towers;

[0143] R is the radius of the earth;

[0144] r is the radius of the earth longitude profile circle.

[0145] S6, the radius r of the earth longitude profile circle is calculated as:

[0146]

[0147] In the formula:

[0148] is the average latitude between adjacent towers;

[0149] R is the radius of the earth.

[0150] is the average latitude is:

[0151]

[0152] where:

[0153] e1, e2 are the latitudes of adjacent towers.

[0154] S7, according to the length of the overhead line L N , the overhead line resistance Z is:

[0155]

[0156] where:

[0157] p is the resistivity of the overhead line;

[0158] S is the cross-sectional area of the overhead line.

[0159] S8, according to the temperature T at the transmission tower 4, the specific values of the resistivity p, the conductor specific load g, and the horizontal stress d are obtained, wherein:

[0160] The resistivity p is proportional to the temperature T;

[0161] The conductor specific load g is proportional to 1 / temperature T;

[0162] The horizontal stress d is proportional to 1 / temperature T.

[0163] S9, according to the induced voltage U i of the overhead line, the voltage drop AU of the overhead line is:

[0164] AU = U0 - KU i ,

[0165] where:

[0166] K is the induced voltage conversion coefficient;

[0167] KU i is the line voltage converted from the induced voltage.

[0168] Combined with the overhead line resistance Z, the line loss power AP is:

[0169]

[0170] To sum up, only for the preferred embodiment of the present application, not to limit the scope of the present application, through the above description, the relevant staff can fully in the range of not deviating from the technical idea of the present application, make a variety of changes and modifications. The technical scope of the present application is not limited to the content of the specification, all equivalent changes and modifications of the shape, structure, features and spirit of the present application are included in the scope of the claims of the present application.

Claims

1.A line loss online monitoring method, characterized in that: information data M collected by a master controller (13) through a communication antenna (14) is: wherein: X is the position coordinate of the power transmission line, T is the temperature at the power transmission tower (4); the position coordinate X in the formula is: wherein: N is the latitude information, E is the longitude information; according to the position coordinate X, the geographic coordinate Y of the coordinate point is obtained: wherein: N is the latitude information, E is the longitude information, H is the altitude; wherein: L0 is the length of the overhead line in the section; wherein: L is the span between adjacent towers, g is the conductor weight per unit length, δ is the horizontal stress, ΔH is the height difference of the suspension point, ΔH=0 indicates that the suspension point has no height difference; or wherein: L is the span between adjacent towers, g is the conductor weight per unit length, δ is the horizontal stress, α is the height difference angle, ΔH is the height difference of the suspension point, ΔH≠0 indicates that the suspension point has a height difference and is calculated through the height difference angle α; the span L is: wherein: ΔN is the latitude distance difference between adjacent towers, ΔE is the longitude distance difference between adjacent towers; the latitude distance difference ΔN in the formula is: wherein: Δn is the latitude difference between adjacent towers, R is the radius of the earth; the longitude distance difference ΔE in the formula is: wherein: Δe is the longitude difference between adjacent towers, r is the radius of the earth longitude profile circle; the radius r of the earth longitude profile circle is: wherein: R is the radius of the earth; wherein: e1, e2 are the latitudes of adjacent towers; wherein: ρ is the resistivity of the overhead line, S is the cross-sectional area of the overhead line; according to the temperature T at the power transmission tower (4), the specific values of the resistivity ρ, the conductor weight per unit length g and the horizontal stress δ are obtained, wherein: the resistivity ρ is proportional to the temperature T, the conductor weight per unit length g is proportional to 1 / temperature T, the horizontal stress δ is proportional to 1 / temperature T. 2.A line loss online monitoring device according to the line loss online monitoring method of claim 1, characterized in that: it is used to monitor the line loss of the overhead line between the power generation transformer (2) and the power consumption transformer (3), comprising: a disc-shaped induction plate (10) fixed on the power transmission tower (4), the induction plate (10) is provided with an induction coil (11) inside, a mounting hole (12) is provided in the center of the induction plate (10), an insulator (41) for suspending the overhead line is inserted into the mounting hole (12), and the induction plate (10) is provided with a master controller (13) electrically connected with the induction coil (11); the master controller (13) comprises: a processing module for processing induction electric signal; a power module for converting induction electric into power supply; a position module for positioning; a temperature module for collecting and processing temperature signal; a communication antenna (14) for uploading information data. ， ​ U i for the induced voltage of an overhead line, ​ ​ ​ ， ​ ​ ​ ​ ， ​ ​ ​ ​ The overhead line length L is calculated from the information data M N is: ， ​ L N L is the total length of the overhead line from the nth tower to the first tower on the power transformer (2) side, L i L is the length of the overhead line between adjacent towers, ​ The overhead line between adjacent towers is suspended in a flat-throw manner, and the length L of the overhead line is i L = 2H ， ​ ​ ​ ​ ​ ​ The overhead line between adjacent towers is suspended in a slanting manner, and the length L of the overhead line i is: ， ​ ​ ​ ​ ​ ​ ​ ， ​ ​ ​ ​ ， ​ ​ ​ ​ ， ​ ​ ​ ​ ， ​ is the average latitude between adjacent towers, ​ wherein the mean of the latitudes in the formula is: ， ​ ​ According to the length L of the overhead line N , the resistance Z of the overhead line is obtained as ， ​ ​ ​ ​ ​ ​ ​ ​ According to the induced voltage U of the overhead line i , the voltage drop ΔU of the overhead line is obtained, and in combination with the overhead line resistance Z, the line loss power ΔP is obtained as: 。 ​ ​ ​ ​

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