Optical Fiber Composite Ground Wire Research Articles

Analysis of Induced Voltage of Optical Fiber Composite Ground Wire in 35 kV Overhead Distribution Lines

Analysis of Induced Voltage of Optical Fiber Composite Ground Wire in 35 kV Overhead Distribution Lines

Study on Distribution Characteristics of Induced Voltage and Current on Optical Fiber Composite Ground Wire of Distribution Line

The OPGW of the distribution line combines communication and lightning protection. During the electromagnetic coupling process among power distribution lines, induced voltage and induced current will be generated on OPGW. This threatens the safety of power operation and maintenance personnel. This paper uses the ATP-EMTP software to build the electromagnetic coupling model of a 10kV single-loop distribution line with the OPGW. Factors including OPGW grounding mode, OPGW grounding resistance, OPGW relative position, and line load are considered, and the influence of different factors on the induced voltage and current on the OPGW of the distribution line is compared and analyzed in detail. The simulation results show that the ground resistance and relative position have little effect on the induced voltage and induced current of the OPGW. Grounding mode and line load greatly influence the induced voltage and induced current of the OPGW. The simulation conclusion provides a certain theoretical basis for selecting the parameters of OPGW of a 10kV single-circuit distribution line.

Discussion on The Application of Overhead Power Communication Optical Cable

Overhead optical cable is an important framework for the power communication network. The common types of optical cables erected with power lines of 35 kV and above include optical fiber composite ground wire (OPGW), non-metallic self-supporting optical cable (ADSS) and optical fiber composite phase wire (OPPC), different types of optical cables have their own characteristics, and are suitable for different situations. This article starts with the structure of the optical cable, analyzes the characteristics of different types of optical cables, and further analyzes and compares from the perspective of electrical, economic, and maintenance. For the problems encountered during the use of different types of optical cables, the safety, The technical regulations are more comprehensively explained. This article is for operation and designer reference.

Induced Voltage of Overhead Ground Wires in 50 0-kV Single-Circuit Transmission Lines

General grounding method of overhead ground wires adopted in Chinese 500-kV transmission lines is usually optical fiber composite ground wire (OPGW) grounded at each tower while common ground wire (CGW) insulated with one point grounded. Energy loss of OPGW and high induced voltage of CGW is a problem to be concerned as to its values and control methods. Both field measurement and ATP-EMTP simulation of induced current and induced voltage of overhead ground wires in a 500-kV single-circuit transmission line are carried out in this paper. Quantitative data of induced current and energy loss show the urgent necessity to reduce the energy loss and change the grounding method of overhead ground wires. A no-loss method for ground wires is proposed by comparing advantages and disadvantages of three grounding methods of overhead ground wires, where both OPGW and CGW are insulated with one point grounded. Induced voltage is calculated in different transposition pitch and segment length of ground wires with grounding position at the end of the line or at the midpoint of transposition pitch and segment. It shows that induced voltage of ground wires grounded at the midpoint of transposition pitch and segment is half of which grounded at the end. Moreover, induced voltage of overhead ground wires can be reduced to 500 V or other limited values by choosing a reasonable transposition pitch and grounding position.