Implementation of a digital distance relay using an interpolated integral solution of a differential equation

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · IEEE Trans. Power Del.; (United States)

DOI:https://doi.org/10.1109/61.193946· OSTI ID:6627305

Kudo, H; Sasaki, H; Seo, K ^[1]; Takahashi, M; Yoshida, K; Maeda, T ^[2]

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1. Hitachi, Ltd., Hitachi, Ibaraki (JP)
2. The Tokyo Electric Power Co., Inc., Tokyo (JP)

Low-frequency transient oscillatory voltages and currents have prompted development of new distance protection schemes for UHV and EHV lines with large stray capacitances. This paper describes one distance protection scheme based on a differential equation for the transmission lines. An integral method with an interpolation technique is applied using a very limited number of data at a sampling rate of 600 Hz. A prototype digital distance relay composed of two 16-bit microprocessors is developed. The characteristic test results correspond well to fault simulations and practical performance is verified to have a high accuracy of +-5% and operating time of less than 50 ms.

• OSTI ID: 6627305
• Journal Information: IEEE Trans. Power Del.; (United States), Journal Name: IEEE Trans. Power Del.; (United States) Vol. 3:4; ISSN ITPDE
• Country of Publication: United States
• Language: English

Related Subjects

200301* -- Power Transmission & Distribution-- AC Systems
EHV & UHV-- (-1989)
200302 -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
AC SYSTEMS
ACCURACY
CAPACITANCE
COMPUTERIZED CONTROL SYSTEMS
COMPUTERIZED SIMULATION
COMPUTERS
CONTROL SYSTEMS
CURRENTS
DC SYSTEMS
DIFFERENTIAL EQUATIONS
DIGITAL SYSTEMS
EHV AC SYSTEMS
EHV DC SYSTEMS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTRICAL TRANSIENTS
ELECTRONIC CIRCUITS
ENERGY SYSTEMS
EQUATIONS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
IMPLEMENTATION
INTEGRAL EQUATIONS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
PERFORMANCE
PHYSICAL PROPERTIES
POWER SYSTEMS
RELAYS
SIMULATION
TRANSIENTS
UHV AC SYSTEMS
UHV DC SYSTEMS
VOLTAGE DROP