Patent ID: 7626286

Claim:
An apparatus for mains-synchronous connecting of a disconnected circuit breaker irrespective of a load flow direction, having a current transformer and having a voltage transformer on a first side of a circuit breaker, wherein a further voltage transformer is provided on a second side of the circuit breaker, wherein the circuit breaker is comprised in a switchgear assembly, which is configured such that the load flow direction is not defined by the circuit breaker, wherein connections to a control device exist for reception of measurement signals from the current transformer and from the two voltage transformers, wherein the control device has means for processing and comparing the voltage measurements on both sides of the circuit breaker, wherein the control device has a memory with data which is characteristic of all possible switching situations, which data is used to decide which voltage measurement signal is used as a reference value for the mains-synchronous tripping of the circuit breaker, and wherein the control device has means for generating a switching command which initiates the mains-synchronous switching of the circuit breaker such that a timing characteristic of its tripping is controllably varied based on a detected switching situation for improved mains-synchronous switching.