Section 3 1MAC309294-MB F
Basic functions
76 RER620
Technical Manual
3.11.1.12 PH_ORD_IN block
Function block
Figure 31: Function block
Functionality
Normally, the relay expects to receive voltages, currents and breaker positions in the order
specified by the setting "Phase Rotation". In reality, transmission lines are needed to be
transposed to ensure the line impedance to be as symmetrical as possible under normal
condition. With the system setting "Phase Order Mode", the relay (RER620) can properly
indicate phase measurement and protection function operations, but it does not have a
default mean to recognize the breaker (pole) position order.
This function reorders physical pole position inputs based on the global General System
"Phase Order Mode" setting value to the normal system phase order.
The phase order from actual pole position inputs could be any of possible six combinations
like ABC, BAC, CAB etc. With this function and the phase order mode setting, the ACT
logic does not need to be changed for different physical phase orders. The order of the
inputs of this function must match the General System "Phase Order Mode" setting value.
The outputs of the function are always in the normal phase order (ABC) and thus they can
be connected to the phase order neutral function blocks like SCBXCBR, SDARRREC etc.
This function should be used in conjunction with the function PH_ORD_OUT.
Signals
The function does not have any parameters available in LHMI or Protection and Control
Relay Manager (PCM600).
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