7.0.1 Excitation transformers may be provided with the followingprotection.(1) Longitudinal differential protection.(2) Instantaneous overcurrent protection.(3) Overcurrent protection.(4) Buchholz protection.(5) Thermal protection.7.0.2 Longitudinal diffe...[继续阅读]

    5.1.1 Main transformers and interconnecting transformers with aunit capacity ranging from 8 MVA to 890 MVA shall be equippedwith corresponding protective devices against the following faultsand abnormal operations as specified herein.(1) Inter-phase short...[继续阅读]

    14.2.1 The 3 kV to 10 kV HV service asynchronous/synchronousmotors shall be equipped with corresponding protection against thefollowing faults and abnormal operations.(1) Inter-phase short circuit of stator winding.(2) Single-phase-to-earth of stator wind...[继续阅读]

    11.0.1 Breaker failure protection shall be provided for circuitbreakers of 220 kV to 750 kV and generator circuit breakers (GCBs)of 300 MW and above.The GCBs of 100 MW to 300 MW should beequipped with breaker failure protection.The 110 kV circuit breakers...[继续阅读]

    15.1.1 Current transformers (CTs) for protection purpose shallcomply with relaying protection requirements in types, the number ofsecondary windings, transformation ratio, capacity and accuracy class.Selection and calculation of CTs shall comply with DL/T...[继续阅读]

    15.6.1 DC power supply, AC current, AC voltage, and incomingsignal circuits of protective devices shall be of copper-core shieldedcable.Spare core in the cable shall not be used to earth instead of theshield.15.6.2 AC current and AC voltage circuits, AC a...[继续阅读]

    The motor-generators shall be provided with (negative sequence)overload protection for stator surface respectively for generator-modeand motor-mode.Refer to 3.7 for other requirements....[继续阅读]

    5.2.1 Oil-immersed transformers, on-load voltage regulators, andHV cable terminal boxes embedded in transformer oil tanks shall beequipped with Buchholz protection.They provide primary protectionfor inter-phase, inter-turn and interlayer short circuits, a...[继续阅读]

    Corresponding spinning direction in one mode of a motor-generatormay be inconsistent with the voltage phase sequence. Themotor-generator shall be equipped with voltage phase sequenceprotection respectively for generator-mode and motor-mode. Theprotection ...[继续阅读]

    1.0.1 This standard specifies the basic principles to be followed indesign of relaying protection for hydropower plants.1.0.2 This standard applies to the relaying protection design forsuch electrical equipment in hydropower plants as generators with auni...[继续阅读]