Wiring testing device

US8717038B2 · kind B2 · utility

Assignee

• SMA Solar Technology AG · DE

Inventors

• Uwe Stickelmann · Kaufungen, DE
• Christian Bode · Braunschweig, DE
• Benedikt Kuenzel · Geisleden, DE
• Henrik Wolf · Kassel, DE

Key dates

• Filing date: Nov 4, 2011
• Grant date: May 6, 2014
• Expiry date: Mar 18, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/67
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A wiring testing device configured to test the wiring correctness of an inverter is disclosed. The inverter is configured to be connected to a low-voltage three-phase system with a neutral conductor serving as a reference point for grid-side conductor voltages. The wiring testing device includes a test circuit configured to measure the grid-side conductor voltages and determine an average value from the sum of the instantaneous values of the grid-side conductor voltages, and a display unit configured to display an error message if the average value exceeds a threshold voltage for a defined time period. The wiring testing device further includes a capacitor connected between a phase of the three-phase system and the neutral conductor configured to generate a voltage imbalance if the neutral conductor connection is missing, wherein the test circuit is configured to measure the conductor voltages and determine the voltage imbalance.