JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Generation &measurement of high voltages and Dielectric & insulation engineering.

Course Objectives:

• To know the types of partial discharges
• To know the PD testing and monitoring
• To understand the Electrical discharge detection circuits
• To locate the partial discharges

Course Outcomes:

• A solid background in the basics of PD test and monitoring techniques and methodology
• To analyze partial discharge occurrence in electrical equipments
• To analyze the gas insulated switchgear devices

UNIT - I

Types of partial discharges and its occurrence and recurrence and magnitudes: Definition of partial discharges, inception of internal discharges, inception of corona discharges.

UNIT - II

Discharges by electrical treeing. Discharges at AC Voltages corona discharges at D.C. Voltages discharges at impulse voltages. Object of discharge detection, Quantities related to the magnitude of discharges, choice of PD as a measure for discharges.

UNIT - III

Electrical discharge detection & Detection circuits: Basic diagram, amplification of impulse, sensitivity, resolution, observation, Straight detection. Balanced detection, calibrators, Interferences, choice between straight detection & balance detection, common mode rejection.

UNIT - IV

Location of Partial discharges; Non – electric location, location by separation of electrodes, location with electrical probes. Location by traveling waves, PD location in cables & switchgear by traveling waves. Evaluation of discharges; Recognition, mechanisms of deterioration, evaluation, specification.

UNIT - V

Detection in actual specimen: Detection in capacitors, cables, bushings. Transformers, machine insulation, Gas – insulated switchgear.

TEXT BOOK:

• 1. Partial Discharge in HV Equipment by F. Kruguer, Butterworths & Co., Publications Ltd., 1989. M. Tech – I Year – II Sem. (PS H.V. Engg. / H.V. Engg.)