Pile foundation tower-footing impedance measuring apparatus and its method

A technology of grounding impedance and measuring device, which is applied in the direction of grounding resistance measurement, measuring device, measuring electric variable, etc.

Inactive Publication Date: 2008-09-17
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device and method for accurately measuring the grounding impedance of a pile foundation tower in view of the deficiencies of the existing tower grounding impedance measuring device and method

Method used

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  • Pile foundation tower-footing impedance measuring apparatus and its method
  • Pile foundation tower-footing impedance measuring apparatus and its method
  • Pile foundation tower-footing impedance measuring apparatus and its method

Examples

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Effect test

Embodiment 1

[0053] Figure 1~5 As shown, a pile foundation pole tower grounding impedance measurement device mainly includes auxiliary measuring electrodes, high-precision soft belt type Rogowski coil current sensor 2, pole tower grounding impedance measuring instrument 3 and so on. Its auxiliary measuring electrodes are a current electrode 4 and a voltage electrode 5, each electrode is a steel rod with a length of 25 cm and a diameter of 1 cm, and the current electrode 4 is inserted into the ground at a distance of 45 m from the pole tower 1. The current pole port 9 of the measuring instrument 3 is connected to form a current loop for measurement; the voltage pole 5 is inserted into the same side of the current pole 4 and the distance from the pole tower is 0.6 times the distance from the current pole 4, and the measurement is carried out through the wire 7 The voltage pole terminal 10 of the instrument is connected. There are four high-precision soft-band Rogowski coil current sensors ...

Embodiment 2

[0055] A grounding impedance measuring device for a pile foundation pole tower, same as embodiment 1. Its characteristics are: each electrode is a steel rod with a length of 20cm and a diameter of 0.8cm, the current pole 4 is inserted into the ground at a distance of 40m from the tower 1, and the voltage pole 5 is inserted on the same side of the current pole 4 and at a distance from the pole tower 1. In the ground whose distance is 0.5 times of the distance between the current poles 4, each coil is evenly and densely wound with an enamelled copper wire 17 with a wire diameter of 0.2 mm on six permeable magnetic cores 16 with a diameter of 1 cm and a length of 4 cm. The magnetically conductive core 16 of the enamelled copper wire 17 is filled into an open annular plastic hose 18 with an inner diameter of 1.5 cm. The inner diameter of the whole coil is 8 cm and the number of turns is 100 turns. The analog signal output module adjusts and outputs a step frequency of 1Hz, the sig...

Embodiment 3

[0057] A grounding impedance measuring device for a pile foundation pole tower, same as embodiment 1. Its characteristics are: each electrode is a steel rod with a length of 30cm and a diameter of 1.2cm, the current pole 4 is inserted into the ground at a distance of 60m from the tower 1, and the voltage pole 5 is inserted on the same side of the current pole 4 and the distance from the tower 1 In the ground where the current pole 4 is arranged at a distance of 0.6 times, each coil is evenly wound with an enameled copper wire 17 with a wire diameter of 1 mm on 26 permeable magnetic cores 16 with a diameter of 1.8 cm and a length of 6 cm. The magnetic core 16 of the enamelled copper wire 17 is filled into an open annular plastic hose 18 with an inner diameter of 2 cm. The inner diameter of the entire coil is 50 cm and the number of turns is 1300 turns. The analog signal output module adjusts and outputs a step frequency of 1 Hz , The signal frequency is 150Hz different frequenc...

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Abstract

A pile foundation tower footing impedance measuring device and method thereof, relate to an overhead transmission line tower footing impedance measuring device and method thereof. The device comprises an auxiliary electrode, a high accuracy flexible Roche coil current sensor, a tower footing impedance measuring device or the like. The footing impedance of the pile foundation tower is measured by program. The invention has features: simple structure, low cost, easy operation, wide measuring current range, strong antijamming capability, high measuring accuracy and low measuring cost, therefore the invention can be widely used for measuring the overhead transmission line tower footing impedance, especially for measuring the tower footing impedance without down lead, incapable or inconvenient of unfastening the down lead, avoiding unfastening the down lead.

Description

technical field [0001] The invention belongs to the technical field of lightning protection and grounding of overhead transmission lines, and in particular relates to a measuring device and method for grounding impedance of towers of overhead transmission lines. Background technique [0002] The grounding impedance of the pile foundation tower of the overhead transmission line refers to the impedance presented by the tower foundation and the grounding device when the ground current flows into the earth through the foundation and the grounding device. For overhead transmission lines, the size of the grounding impedance of the tower is directly related to the lightning resistance level of the overhead transmission line, and is related to the number of lightning trips on the overhead transmission line. Articles 94 and 95 of my country's "Operation Regulations for Overhead Power Transmission Lines" put forward requirements for the daily operation and maintenance of the grounding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20G01R27/08
Inventor 司马文霞陆国俊袁涛张泽华罗真海杨庆
Owner CHONGQING UNIV
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