RED670 1MRK505228-BEN E Four step negative sequence overcurrent protection NS4PTOC

　　Four step negative sequence overcurrent protection (NS4PTOC) has an inverse or definite time delay independent for each step separately.

　　All IEC and ANSI time delayed characteristics are available together with an optional user defined characteristic.

　　The directional function is voltage polarized or dual polarized.

　　NS4PTOC can be set directional or non-directional independently for each of the steps.

　　NS4PTOC can be used as main protection for unsymmetrical fault; phase-phase short circuits, phase-phase-earth short circuits and single phase earth faults.

　　NS4PTOC can also be used to provide a system back-up for example, in the case of the primary protection being out of service due to communication or voltage transformer circuit failure.

　　Directional operation can be combined together with corresponding communication logic in permissive or blocking teleprotection scheme. The same logic as for directional zero sequence current can be used. Current reversal and weakend infeed functionality are available.

　　Sensitive directional residual overcurrent and power protection SDEPSDE

　　In isolated networks or in networks with high impedance earthing, the earth fault current is significantly smaller than the short circuit currents. In addition to this, the magnitude of the fault current is almost independent on the fault location in the network. The protection can be selected to use either the residual current or residual power component 3U0·3I0·cos j, for operating quantity with maintained short circuit capacity. There is also available one nondirectional 3I0 step and one 3U0 overvoltage tripping step.

　　No specific sensitive current input is needed.SDEPSDE can be set as low 0.25% of IBase.

　　Thermal overload protection, one time constant LPTTR

　　The increasing utilizing of the power system closer to the thermal limits has generated a need of a thermal overload protection also for power lines.

　　A thermal overload will often not be detected by other protection functions and the introduction of the thermal overload protection can allow the protected circuit to operate closer to the thermal limits.

　　The three-phase current measuring protection has an I2 t characteristic with settable time constant and a thermal memory.

　　An alarm level gives early warning to allow operators to take action well before the line is tripped.

　　Breaker failure protection CCRBRF

　　Breaker failure protection (CCRBRF) ensures fast back-up tripping of surrounding breakers in case the own breaker fails to open. CCRBRF can be current based, contact based, or an adaptive combination of these two conditions.

　　Current check with extremely short reset time is used as check criterion to achieve high security against inadvertent operation.

　　Contact check criteria can be used where the fault current through the breaker is small.

　　CCRBRF can be single- or three-phase initiated to allow use with single phase tripping applications. For the three-phase version of CCRBRF the current criteria can be set to operate only if two out of four for example, two phases or one phase plus the residual current start. This gives a higher security to the back-up trip command.

　　CCRBRF function can be programmed to give a single- or three-phase re-trip of the own breaker to avoid unnecessary tripping of surrounding breakers at an incorrect initiation due to mistakes during testing.

　　Stub protection STBPTOC

　　When a power line is taken out of service for maintenance and the line disconnector is opened in multi-breaker arrangements the voltage transformers will mostly be outside on the disconnected part. The primary line distance protection will thus not be able to operate and must be blocked.

　　The stub protection STBPTOC covers the zone between the current transformers and the open disconnector. The threephase instantaneous overcurrent function is released from a normally open, NO (b) auxiliary contact on the line disconnector.

　　Pole discordance protection CCRPLD

　　An open phase can cause negative and zero sequence currents which cause thermal stress on rotating machines and can cause unwanted operation of zero sequence or negative sequence current functions.

　　Normally the own breaker is tripped to correct such a situation. If the situation persists the surrounding breakers should be tripped to clear the unsymmetrical load situation.

　　The Polediscordance protection function CCRPLD operates based on information from auxiliary contacts of the circuit breaker for the three phases with additional criteria from unsymmetrical phase currents when required.

1MRK505228-BEN_E_en_Product_Guide__RED670_1.2_pre-configured.pdf

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