Patent ID: 9494659
Filing Date: 2016-11-15
CPC Classification: G01R,H01H,H02S,Y02E

Claim Text:
1. A method for checking a photovoltaic inverter separator between the photovoltaic inverter and a power supply network, comprising multiple phases and a neutral conductor, wherein multiple switching contacts of multiple relays of the separator are controlled by the photovoltaic inverter, and each voltage at each phase is measured upstream and downstream of the separator in relation to the neutral conductor, wherein in the separator at least one phase upstream of the separator and at least one phase downstream of the separator is cross-bonded, wherein the switching contacts of the separator are connected and checked in steps according to a switching pattern, wherein the switching pattern is implemented by a stepwise change of the switching contacts of the separator from one switching state to another switching state, wherein each switching state is assigned a measurement result in accordance with an evaluation table, and wherein the functionality of the switching contacts of the separator is derived in each switching state of the switching pattern in that, in each switching state, each voltage is measured at at least one phase upstream and downstream of the separator in relation to the neutral conductor, and the voltages are compared to the measurement results of the evaluation table.