15.4.1 The circuit breakers of generators 100 MW and above andof 220 kV to 750 kV shall be provided with dual trip coils.15.4.2 The 220 kV and above circuit breakers in split-phaseoperation shall be provided with inconsistent three-phase (open phase)prote...[继续阅读]

    15.5.1 For DC power supply of relaying protection devices, ripplecoefficient of voltage shall not be higher than 2%, the minimumvoltage not lower than 85% of rated voltage, and the maximumvoltage not more than 110% of rated voltage.15.5.2 Parasitic circui...[继续阅读]

    Turbine-generator units that operate in condensing operationcondition shall be equipped with system disconnection (power loss)protection, which initiates a unit shutdown with time-delay....[继续阅读]

    4.3.1 Motor-generators operating in motor-mode may be subject toabnormal conditions like under-power and power loss, and shall beprovided with under-power protective devices to initiate a unitshutdown.4.3.2 The under-power protection of motor-generator co...[继续阅读]

    4.1.1 Generator-motors with a unit capacity of 350 MW and belowshall be provided with the following protection based on theirfeatures and synchronous starting requirements.(1) Reverse power protection.(2) Under-power protection.(3) Under-frequency protect...[继续阅读]

    5.3.1 Transformers with a unit capacity of 8 MVA and above shallbe equipped with longitudinal differential protection.5.3.2 For the generator-transformer bank with a unit capacity lowerthan 100 MW and equipped a breakers in-between, the transformershall b...[继续阅读]

    2.0.1 For determination of relaying protection configurationscheme, comprehensive considerations shall be given to thefollowings.(1) The structure characteristics of power equipment and power grid,automation level of hydropower plant, and operation mode.(...[继续阅读]

    5.4.1 The backup protection against transformer inter-phase shortcircuit shall act as backup protection of transformer primaryprotection and protection for adjacent elements. The backupprotection shall have necessary sensitivity on busbar inter-phase shor...[继续阅读]

    10.0.1 Interconnecting lines shall be provided with instantaneousprimary protection, which shall trip the circuit breakers at both endsof the interconnecting lines.The interconnecting lines of 220 kV andabove shall be equipped with duplicated primary prot...[继续阅读]

    3.1.1 Generators with a unit capacity 6 MW to 800 MW shall beprovided with corresponding protection against the following faultsand abnormal operations.(1) Inter-phase short circuit of stator winding.(2) Inter-turn short circuit of stator winding.(3) Inte...[继续阅读]