Distance Protection Sample Clauses
The Distance Protection clause establishes measures to safeguard parties when contractual obligations are affected by geographical separation or remote operations. Typically, this clause outlines protocols for communication, verification, and performance monitoring when parties cannot interact in person, such as requiring electronic confirmations or remote inspections. Its core function is to mitigate risks and misunderstandings that may arise due to distance, ensuring that contractual duties are fulfilled reliably even when parties are not physically present together.
Distance Protection. Distance protection for 220 kV lines shall comprise one distance relay installed by OrPower 4 in Olkaria III Substation operating in conjunction with teleprotection channels over fibre optic circuits. The distance Protection shall operate in a permissive overreach mode over a teleprotection signalling channel. The distance relay shall operate for all types of phase and earth faults. Separate phase and earth fault distance measuring elements shall be provided. Common elements with transfer switching arrangements will not be accepted. Phase and earth fault compensation features shall be incorporated to ensure accurate distance measurements for all types of fault and to allow for variation in the path of earth faults on the system.
Zones 1 and 2 shall operate only for faults in the protected direction. Under no circumstances shall the relay operate for reverse faults even when the voltage supplied to the relay falls to zero on all three phases. Details of methods used for polarising relays to deal with faults close to the relaying point shall be provided. Zone 3 shall not be non-directional and shall be capable of being independently off-set in both directions. Starting shall be by impedance relays; overcurrent starting will not be accepted. The relay characteristic shall cover the protected line plus the longest line emanating from the remote station taking current infeed into account. The starting relays shall not operate during maximum power transfer. During single phase to earth fault coinciding with maximum power transfer, only the starting relay associated with the faulted phase shall operate. The reach of each measuring zone and starting relay shall be individually adjustable by suitable steps across the setting range. The characteristic angle shall be adjustable between approximately 40 and 85 degrees. Zone 2 and Zone 3 shall have a delay setting range of 0.1 to 1.0 second and 0.5 to 5.0 seconds respectively. The sensitivity of the protection shall be adequate for definite operation under minimum plant and single outage conditions and shall not exceed 30 per cent rated current. The relay characteristic shall ensure adequate earth fault resistance cover under all conditions. The operating time of each zone shall be substantially independent of fault current magnitude. The operating times shall be stated in the Schedule of Particulars and, in addition, curves shall be provided showing the effect of line and source impedance, fault position and operating...
Distance Protection. Distance protection for 220 kV lines shall comprise one distance relay installed by OrPower 4 in Olkaria III Substation operating in conjunction with teleprotection channels over fibre optic circuits. The distance Protection shall operate in a permissive overreach mode over a teleprotection signalling channel. The distance relay shall operate for all types of phase and earth faults. Separate phase and earth fault distance measuring elements shall be provided. Common elements with transfer switching arrangements will not be accepted. Phase and earth fault compensation features shall be incorporated to ensure accurate distance measurements for all types of fault and to allow for variation in the path of earth faults on the system.