CN111504201A - Method for measuring sag of flexible conductor in transformer substation - Google Patents

Method for measuring sag of flexible conductor in transformer substation Download PDF

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CN111504201A
CN111504201A CN202010395107.6A CN202010395107A CN111504201A CN 111504201 A CN111504201 A CN 111504201A CN 202010395107 A CN202010395107 A CN 202010395107A CN 111504201 A CN111504201 A CN 111504201A
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flexible conductor
sag
ground
measuring
transformer substation
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CN111504201B (en
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赵聪
李松原
李苏雅
李楠
张弛
张黎明
郭博文
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Electric Power Research Institute of State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Electric Power Research Institute of State Grid Tianjin Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures

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  • General Physics & Mathematics (AREA)
  • Electric Cable Installation (AREA)

Abstract

The invention relates to a method for measuring sag of a flexible conductor in a transformer substation, which is technically characterized by comprising the following steps: measuring the shadow length l of two wire frames on a horizontal ground1And l2(ii) a Measuring the length of the marker post between the ground of two wire frames in the ground shadow0(ii) a Measured to obtain C2C3Has a length of l3Tan α was obtained according to the principle of parallel light1＝tanα2＝tanα3＝tanα0＝l0/h0＝l1/h1＝l2/h2＝l3/h3And calculating the sag of the flexible conductor in the transformer substation according to the calculation result. The invention has reasonable design, indirectly measures the sag of the flexible conductor in the transformer substation by utilizing the principle of parallel light, realizes the function of quickly and accurately measuring the sag of the flexible conductor in the transformer substation under the conditions of unknown span and framework height of the flexible conductor and electrification, can timely master the running state of the flexible conductor, and ensures that the flexible conductor can be in a stable stateThe device is safe and reliable to operate, has the advantages of simple and convenient operation, small measurement error, no influence of charged safe distance and the like, and can be widely applied to the sag measurement of the flexible conductor with the span less than 100 m.

Description

Method for measuring sag of flexible conductor in transformer substation
Technical Field
The invention belongs to the technical field of transformer substations, and relates to a flexible conductor in a transformer substation, in particular to a flexible conductor sag measuring method in a transformer substation.
Background
The vertical distance between the lowest point on the wire and the connecting line of the suspension points is called the sag of the wire. After a long-term operation of the wire, sag becomes large due to initial elongation (plastic elongation and creep elongation) and the like. If the sag does not meet the design requirements, accidents such as short circuit or tower collapse are easily caused.
In the operation process of the transformer substation, sag measurement is an important means for checking the operation state of a flexible conductor in the transformer substation. The existing method for measuring the sag of the flexible conductor in the transformer substation is mainly divided into two methods of power failure measurement or live measurement by using instruments such as a laser range finder, a theodolite, a total station and the like. The following description will be made for these two measurement methods, respectively:
the power failure measurement method is simple to operate and high in accuracy, but is difficult to effectively develop due to the influence of a power failure plan after the transformer substation is put into operation. When instruments such as a total station are used for live-line measurement, the operation is complex, and meanwhile, due to the fact that the span of the flexible conductor in the transformer substation is small, the framework height is low and is influenced by the live-line safety distance, the position of the lowest point of the flexible conductor is difficult to determine quickly and accurately, and the error of a measurement result is large.
In summary, in order to timely and accurately grasp the sag of the flexible conductor of the transformer substation, so as to ensure safe and reliable operation of a power grid, a method for quickly and accurately measuring the sag live of the flexible conductor of the transformer substation is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for measuring the sag of a flexible conductor in a transformer substation.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for measuring sag of a flexible conductor in a transformer substation comprises the following steps:
step 1, selecting flexible conductors to be measured in a transformer substation, wherein the vertex of the structure of the two flexible conductors is A1And B1The vertical projection points on the ground are respectively A2And B2A is1A2And B1B2Height is respectively marked as h1And h2The shadow of the two conducting wires on the horizontal ground is respectively marked as A2A3And B2B3Measured to obtain A2A3And B2B3Are each l1And l2；
Step 2, setting a standard height as h0Marker post M1M2Vertically arranged on a connecting line between two wire framework grounds, and measuring to obtain a marker post M1M2Shadow on ground M2M3Has a length of l0；
Step 3, flexible conducting wire
Figure BDA0002487239360000021
Straight line A2B2And soft wire ground shadow
Figure BDA0002487239360000022
Midpoint differenceIs set to C1、C2And C3Wherein, C1Is the lowest point of the flexible conductor, C2Is C1Vertical projection point on the ground, C3Is C1Shading points on the ground; making a straight line l// A2B2And is shaded with the flexible conductor ground
Figure BDA0002487239360000023
Tangent to point C3(ii) a Passing point C3As C2C3//A2A3Crossing A2B2At point C2Passing point C2As C1C2⊥A2B2AC flexible conductor A1B1At point C1(ii) a C is to be1C2Height is recorded as h3Measured to obtain C2C3Has a length of l3；
Step 4, according to the parallel light principle, sunlight A1A3、B1B3、C1C3、M1M3Irradiating the ground with parallel light at an angle α1、α2、α3、α0And equality, the following relationship is obtained:
tanα1＝tanα2＝tanα3＝tanα0＝l0/h0＝l1/h1＝l2/h2＝l3/h3
step 5, marking the marker post M1M2Standard height h of0Marker post M1M2Sunlight shines on the ground shadow M2M3Length l of0、A2A3Length l of1And B2B3Length l of2Substituting the relation obtained in the step 4 into the relation, and obtaining by calculation:
A1A2height h of1＝l1*h0/l0
B1B2Height h of2＝l2*h0/l0
C1C2Height h of3＝l3*h0/l0
And further obtaining the flexible conductor sag:
flexible conductor sag d1＝h1-h3＝(l1-l3)*h0/l0
Flexible conductor sag d2＝h2-h3＝(l2-l3)*h0/l0。
Furthermore, the measurements were performed in well lit, calm weather.
Furthermore, the measurement processes are performed at the same time.
Moreover, the pitch between the two lead frames is less than 100 m.
The invention has the advantages and positive effects that:
1. the invention has reasonable design, indirectly measures the sag of the flexible conductor in the transformer substation by utilizing the principle of parallel light, realizes the function of quickly and accurately measuring the sag of the flexible conductor in the transformer substation under the conditions of unknown span and framework height of the flexible conductor and electrification, can timely master the running state of the flexible conductor and ensures the safe and reliable running of equipment.
2. The method has the advantages of simple and convenient operation, small measurement error, no influence of charged safe distance and the like, and can be widely applied to the sag measurement of the flexible conductor with the span of less than 100 m.
Drawings
Fig. 1 is a measurement schematic of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention utilizes the parallel light principle, the height of an object under sunlight is in direct proportion to the length of a ground shadow, and a method for measuring the sag of a flexible conductor in a transformer substation is established by measuring the length of the shadow on the ground, as shown in figure 1, the method comprises the following steps:
step 1, selecting a certain section of flexible conductor to be measured in a transformer substation under the condition of sufficient illumination and no wind, wherein the top points of the conductor frameworks on two sides are respectivelyA1、B1The vertical projection points on the ground are respectively A2、B2A is1A2、B1B2Height is respectively marked as h1、h2The shadow of the two conducting wires on the horizontal ground is respectively marked as A2A3、B2B3Determination of A by measurement2A3、B2B3Each length is l1、l2。
Step 2, setting a standard height as h0Marker post M1M2Is vertically arranged on a connecting line between two framework grounds, and is provided with a measuring marker post M1M2Sunlight shines on the ground shadow M2M3Length l0。
Step 3, flexible conducting wire
Figure BDA0002487239360000041
Straight line A2B2And soft wire ground shadow
Figure BDA0002487239360000042
The middle points are respectively set as C1、C2And C3Wherein, C1Is the lowest point of the flexible conductor, C2Is C1Vertical projection point on the ground, C3Is C1Shading points on the ground; making a straight line l// A2B2And the ground shadow of the flexible wire
Figure BDA0002487239360000043
Tangent to point C3. Passing point C3As C2C3//A2A3Crossing A2B2At point C2Passing point C2As C1C2⊥A2B2AC flexible conductor A1B1At point C1。C1C2Height is recorded as h3，C2C3Determination of length l by measurement3。
Step 4, considering that the sun is infinitely far away from the ground and the sunlight A1A3、B1B3、C1C3、M1M3Irradiating the ground with parallel light at an angle α1、α2、α3、α0Equality, resulting in:
tanα1＝tanα2＝tanα3＝tanα0＝l0/h0＝l1/h1＝l2/h2＝l3/h3(1)
due to the shadow length of the flexible conductor on the ground3Shortest, so that the flexible conductor is at a height h from the ground3Shortest, i.e. point C1Is the lowest point of the flexible conductor.
Step 5, mixing the mixture h0、l0、l1、l2Substituting equation (1) yields:
A1A2height h of1＝l1*h0/l0
B1B2Height h of2＝l2*h0/l0
C1C2Height h of3＝l3*h0/l0
Two soft conductor sags are finally obtained:
flexible conductor sag d1＝h1-h3＝(l1-l3)*h0/l0
Flexible conductor sag d2＝h2-h3＝(l2-l3)*h0/l0。
In order to ensure the measurement precision of the sag of the flexible conductor in the transformer substation, the measurement processes are all carried out at the same time.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.

Claims (4)

1. A method for measuring sag of a flexible conductor in a transformer substation is characterized by comprising the following steps:
step 1, selecting flexible conductors to be measured in a transformer substation, wherein the vertex of the structure of the two flexible conductors is A1And B1The vertical projection points on the ground are respectively A2And B2A is1A2And B1B2Height is respectively marked as h1And h2The shadow of the two conducting wires on the horizontal ground is respectively marked as A2A3And B2B3Measured to obtain A2A3And B2B3Are each l1And l2；
Step 2, setting a standard height as h0Marker post M1M2Vertically arranged on a connecting line between two wire framework grounds, and measuring to obtain a marker post M1M2Shadow on ground M2M3Has a length of l0；
Step 3, flexible conducting wire
Figure FDA0002487239350000011
Straight line A2B2And soft wire ground shadow
Figure FDA0002487239350000012
The middle points are respectively set as C1、C2And C3Wherein, C1Is the lowest point of the flexible conductor, C2Is C1Vertical projection point on the ground, C3Is C1Shading points on the ground; making a straight line l// A2B2And is shaded with the flexible conductor ground
Figure FDA0002487239350000013
Tangent to point C3(ii) a Passing point C3As C2C3//A2A3Crossing A2B2At point C2Passing point C2As C1C2⊥A2B2AC flexible conductor A1B1At point C1(ii) a C is to be1C2Height is recorded as h3Measured to obtain C2C3Has a length of l3；
Step 4, according to the parallel light principle, sunlight A1A3、B1B3、C1C3、M1M3Irradiating the ground with parallel light at an angle α1、α2、α3、α0And equality, the following relationship is obtained:
tanα1＝tanα2＝tanα3＝tanα0＝l0/h0＝l1/h1＝l2/h2＝l3/h3
step 5, marking the marker post M1M2Standard height h of0Marker post M1M2Sunlight shines on the ground shadow M2M3Length l of0、A2A3Length l of1And B2B3Length l of2Substituting the relation obtained in the step 4 into the relation, and obtaining by calculation:
A1A2height h of1＝l1*h0/l0
B1B2Height h of2＝l2*h0/l0
C1C2Height h of3＝l3*h0/l0
And further obtaining the flexible conductor sag:
flexible conductor sag d1＝h1-h3＝(l1-l3)*h0/l0
Flexible conductor sag d2＝h2-h3＝(l2-l3)*h0/l0。
2. The method for measuring sag of the flexible conductor in the substation according to claim 1, characterized in that: the measurement is performed in a well-lit, calm weather.
3. The method for measuring sag of the flexible conductor in the substation according to claim 1, characterized in that: the measurement processes are performed at the same time.
4. The method for measuring sag of the flexible conductor in the substation according to claim 1, characterized in that: the span between the two lead frames is less than 100 m.
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