Combined use of definite and inverse time overcurrent elements assists in transmission line ground relay coordination

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.252619· OSTI ID:6093220

Henville, C F ^[1]

---

1. B.C. Hydro, Vancouver, British Columbia (Canada)

In some cases the coordination of ground time overcurrent relays in transmission line protection applications can be difficult. The combined use of definite and inverse time overcurrent characteristics sometimes provides significantly improved protection speed and sensitivity. If multifunction digital relays incorporate both types of characteristics, there is no increase in cost or complexity of protection equipment to provide the hybrid characteristics. Two cases are discussed where the use of hybrid characteristics has achieved improvements. At present the application of hybrid characteristics is limited by difficulties in dynamic coordination. The technology to overcome the dynamic problems is well understood and would appear to be technically feasible.

• OSTI ID: 6093220
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States) Vol. 8:3; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240201* -- Power System Networks
Transmission & Distribution-- AC Systems-- (1990-)
ELECTRIC GROUNDS
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
OVERCURRENT
POWER DISTRIBUTION SYSTEMS
POWER TRANSMISSION LINES
RELAYS