A single-ended traveling wave fault location method for double-circuit transmission lines on the same tower without relying on wave head identification
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A technology of double circuits and transmission lines on the same tower, applied in the direction of the fault location, etc., can solve the problems of incorrect ranging results and large investment in equipment, and achieve reliable ranging results
Active Publication Date: 2016-06-22
KUNMING UNIV OF SCI & TECH
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The double-ended traveling wave ranging method requires a lot of equipment investment, requires synchronous data acquisition, and requires data exchange and communication. Although the traditional single-ended traveling wave ranging method is simple to implement and does not require a communication channel to transmit information from the opposite end, it needs to detect the reflected wave at the fault point. Perform accurate identification, otherwise the ranging result will be incorrect
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Embodiment 1
[0050] Example 1: Phase A metallic grounding fault occurred at the distance measuring terminal M50km from the I circuit of the double circuit transmission line on the same tower. The measuring terminal M detects and records the 1.5ms traveling wave data after the fault, the fault voltage traveling wave and its wavelet transform Modulus maximum such as image 3 Shown.
[0051] 1. According to step (2) of claim 2, using the arrival time of the initial traveling wave of the fault as the reference time, the distance reflected by the wave heads of the same polarity is calculated:
[0053] Similarly, using the arrival time of the initial reverse polarity traveling wave as the reference time, calculate the distance reflected by the wave heads of the traveling waves of the same polarity:
[0054] x'=[89.85, 65.56, 50.51, 45.59, 39.34, 25.03, 18.92, 15.05] km.
[0055] 2. According to the step (3) of the claim, find out ...
Embodiment 2
[0060] Example 2: Phase A metallic grounding fault occurred at a distance of 90km from the measuring terminal M to the I circuit of the double circuit transmission line on the same tower. The measuring terminal M detects and records the 1.5ms traveling wave data after the fault, the fault voltage traveling wave and its wavelet transform Modulus maximum such as Figure 5 Shown.
[0061] 1. According to step (2) of claim 2, using the arrival time of the initial traveling wave of the fault as the reference time, calculate the distance reflected by the wave heads of the same polarity:
[0063] Similarly, using the arrival time of the initial reverse polarity traveling wave as the reference time, calculate the distance reflected by the wave heads of the traveling waves of the same polarity:
[0064] x'=[90.18, 65.56, 50.06, 45.44, 39.93, 25.18, 18.92, 15.49] km.
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Abstract
The invention provides a same-tower double-power transmission circuit single-end traveling wave fault location method, and belongs to the technical field of relay protection of electrical power systems. When a fault occurs to a same-tower double-power transmission circuit, voltage traveling wave data of each phase are detected and recorded; a voltage traveling wave mode maximum value of a fault phase is obtained by converting small waves, and distribution of a traveling wave head on a time axis is obtained; an initial reversed-polarity traveling wave head is marked, and a moment corresponding to the initial reversed-polarity traveling wave head is used as a referential moment to calculate the distance reflected by a same-polarity traveling wave head between an initial fault traveling wave head and the initial reversed-polarity traveling wave head; meanwhile, the moment when the initial fault traveling wave head arrives is used as a referential moment to calculate the distance reflected by the same-polarity traveling wave head between the initial fault traveling wave head and the initial reversed-polarity traveling wave head; two pairs of distances which are close or equal are found from the two sets of distances, and then the distance really reflecting the fault position is distinguished out through a simulation method after measurement.
Description
Technical field [0001] The invention relates to a single-ended traveling wave fault location method for a double-circuit transmission line on the same tower that does not rely on wave head identification, and belongs to the technical field of power system relay protection. Background technique [0002] Double-circuit transmission lines on the same tower have been widely used due to their advantages such as low engineering cost, small occupied corridor width, short construction period, simple operation and maintenance, and significant economic benefits. When the double-circuit line fails, the accurate fault location method has important practical significance for quickly and accurately finding the fault point, quickly eliminating the fault and timely restoring the line power supply. [0003] Travelling wave fault location for double-circuit transmission lines on the same tower is nothing more than single-ended method and double-ended method. The double-ended traveling wave ranging ...
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