Bipolar hvdc transmission system study: development of controlled cascade rectifier for insulator testing. Final report

Technical Report · Fri Aug 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/5165411· OSTI ID:5165411

Beausejour, Y.; Rizk, F. A.M.

This project constitutes a continuation of EPRI project 430-1 covering the power supply for insulator pollution testing. The aims of this project are to determine the circuit elements of a controlled cascade rectifier source to perform pollution tests; the effect of the voltage drop and the short-circuit current on the 50% flashover voltage; the reduction of the 50% flashover voltage with increasing pollution severity on insulators; the effect of the dc resistance R/sub dc/ on the 50% flashover voltage; and to study the leakage current behavior during artificial-pollution tests. The circuit elements of a controlled cascade rectifier source were determined on a model circuit and the results were generalized with a computer program. The proper operation of the circuit was verified with a full-scale circuit at 100 kV. The circuit elements of this controlled source were optimized with respect to the estimated total cost of the power supply. Among the major conclusions of the study are the following: a controlled cascade rectifier connected in a voltage doubler arrangement is an adequate power supply for testing insulators under heavy pollution; and the specifications of the hvdc power supply sufficient to determine the 50% flashover voltage of heavily contaminated insulators (ESDD = 0.5 mg/cm/sup 2/) within an accuracy of 5% may be expressed as the power supply should have a voltage drop of less than 5% at the highest current of 2 A, and the short-circuit current at the output of the hvdc source should be higher than 10 A. This refers to the quasi-stationary short-circuit current subsequent to the transient discharge of the smoothing capacitor.

• Research Organization: Institut de Recherche de l'Hydro-Quebec, Varennes (Canada)
• OSTI ID: 5165411
• Report Number(s): EPRI-EL-1496
• Country of Publication: United States
• Language: English

Related Subjects

200302* -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
AIR POLLUTION
CURRENTS
DATA
DC SYSTEMS
EHV DC SYSTEMS
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPERIMENTAL DATA
FLASHOVER
INFORMATION
NUMERICAL DATA
PERFORMANCE
PERFORMANCE TESTING
POLLUTION
POWER SUPPLIES
POWER SYSTEMS
RECTIFIERS
SPECIFICATIONS
SURFACE PROPERTIES
TESTING
UHV DC SYSTEMS