Nestor Kolcio

The Apple Grove 750-kV Project- 515-kV Radio Influence and Corona Loss Investigations

This paper gives the results to date of radio influence and corona loss tests performed at a voltage of 775 kV at the extra-high-voltage test project at Apple Grove, W. Va., a joint research project sponsored by the American Electric Power Service Corporation and Westinghouse Electric Corporation with six other participating companies. Effects of line radio-influence terminations and larger centerphase conductors are discussed. Radio influence and corona loss results are given for there test lines utilizing 4-conductor bundles with subconductor diameters of 1.0, 1.196, and 1.382 inches.

Long Term Audible Noise and Radio Noise Performance of American Electric Power's Operating 765 KV Lines

This paper describes the instrumentation and reports the statistical analysis of conductor corona generated audible noise and radio noise measured at two recording stations. These stations are located near operating 765 kV lines of American Electric Power. Data covers a four year period when lines were energized at 705 kV, 725 kV, 750 kV and 760 kV. A comparison is made between the operating lines and a similar line at the Apple Grove 750 kV Test Project.

The Apple Grove 750-kV Project: Statistical Analysis of Radio Influence and Corona-Loss Performance of Conductors at 775 kV

This paper presents the results of a statistical analysis of conductor radio influence (RI) and corona-loss data taken over a one-year period on three 775-kV test lines at the Apple Grove 750-kV project, a joint extra-high- voltage ( EHV) field investigation sponsored by American Electric Power Service Corporation and Westing- house Electric Corporation with six other participating companies. Verification of the Apple Grove project special design features is discussed, and long-term averages of corona-loss and RI performance of conductor diameters of 1.382, 1.196, and 1.00 inches used in four-conductor bundles are presented along with their standard deviations. Very little correlation was found between fair weather RI and weather variables. Data are presented showing the effect of rain intensity on foul weather RI and corona loss.

The Apple Grove 750 kV Project Statistical Analysis of Audible Noise Performance of Conductors at 775 kv

This paper presents the results of a statistical anaylsis of conductor corona generated audible hoise as measured at the Apple Grove 750 kV Test Project, a joint field investigation sponsored by the American Electric Power Service Corporation and the Westinghouse Electric Corporation. A comparison of simultaneous audible noise data is made on three sizes of four conductor bundles [diameter of 1.382 in. (35.1 mm), 1.196 in. (30.4 mm), 1.0 in. (25.4 mm)]. Also a correlation is given of simultaneous readings of audible noise, radio noise and corona loss.

Step and Touch Potentials at Faulted Transmission Towers

The paper contains measurements and analyses of earth potential profiles at American Electric Power (AEP) 765 kV transmission towers and at an Ontario Hydro (OH) 500 kV test tower during staged fault tests. Measurements of the step and touch potentials for various tower grounding schemes are shown. The effectiveness of a special ground potential control (GPC) ring installed as part of the tower grounding to reduce step and touch potentials is demonstrated by measurements and supported by computer studies. The step and touch potentials are examined analytically for various GPC ring design parameters and for several two-layer soils.

Apple grove 750 KV project - two year statistical analysis of audible noise from conductors at 775 KV and ambient noise data

This second paper on audible noise from Apple Grove 750 kV Test Project presents the results of a statistical analysis covering approximately two years of data on corona generated audible noise from three test lines. Also, statistical data is given on ambient noise in foul and fair weather, along with day-night variations. A comparison of measurements of audible noise from three sizes of four conductor bundles (diameter of 1.387 inch (35.1 mm), 1.196 inch (30.4 mm) and 1.0 inch (25.4 mm)) with measurements of ambient noise indicates the difference between the corona noise and background levels.

Humidity Effects and Breakdown Characteristics of Class II Insulating Gloves

The paper discusses how humidity and other atmospheric conditions affect the electrical testing of insulating gloves used for live line maintenance. Results of humidity effects upon the AC and DC in-service testing of new gloves and gloves used in service between 0.5 to 11 years are presented. The paper also gives, results of Class II electrical breakdown tests made on new gloves and glQves used between 0.5 year and up to 11 years in service. The average electrical breakdown level for 11 new gloves tested was found to be 71 percent higher than the 30 kVAC rms value given in the Standard.

Field Measurements of Leakage Current in Insulating Gloves

The paper gives results from field measurements of leakage current from Class IV insulating gloves for a range of supply voltage up to 40 kV. The test set-up simulated a contact of an insulating glove with a line. The results have shown that the magnitude of the glove leakage current is dependent on how close is the work location to a ground such as a wood pole or a neutral wire. Also, the paper shows that a large increase in the glove leakage current can occur when a worker wearing insulating gloves stands on an insulating support and then the support is grounded. For example, at 9.6 kV the glove leakage current was measured at 220?A when the mannequin representing a worker was placed on an insulating support, and 2,350 ?or some ten times higher when the support was grounded. The test results have an important bearing on the safety of using insulating gloves during live line maintenance.