YPH107A  3ASD573001A9  ABB  Analog Output Modules

In addition to conventional protection, control, measurement and supervision duties, REX640 can perform both generator (APP11) and non-generator (APP12) circuit breaker synchronizing. Successful synchronization of two alternating power sources can be done by matching their voltage, frequency, phase sequence and phase angle. The circuit breaker (CB) connects the two sources after a period of CB closing time from the instant of a given close command. Hence, all the conditions of synchronization need to be met at the instant of CB close operation for successful synchronization.

Each REX640, being part of the overall synchronizing scheme, contains its own synchronizer function. When a generator CB is to be synchronized, the related REX640 controls the generator’s voltage, frequency and angle difference by  requesting the generator’s AVR and prime mover’s governor to change the set-points accordingly. The generator circuit breaker synchronizing does not require information exchange between other REX640 relays within the scheme.

When a non-generator CB is to be synchronized, all the REX640 relays within the scheme exchange information between themselves in order to identify suitable generator(s) for the voltage and frequency matching. Once the generators are identified and selected, the REX640 related to the circuit breaker to be synchronized sends a request to the selected generator(s) REX640 for the required voltage and frequency corrections. When the voltage, frequency and the angle difference across the CB under synchronization are within the set limits, REX640 closes the circuit breaker. The information  exchange between the REX640s takes place using IEC 61850-8-1 binary and analog GOOSE signaling over Ethernet

The LHMI panels of REX640 can be used as local user interface for circuit breaker synchronization. The upper-level remote control systems like SCADA, DCS or PMS can interact with the synchronizing scheme using MMS or Modbus protocols. The  REX640-based synchronizing scheme supports manual, semimanual and automatic synchronizing modes.

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