Power-measuring device and a measuring system for measuring the power of several phases in a multiphase system

Power-measuring devices for measuring the power of a multiphase system comprising:

• a first power-measuring device comprising:
• a meter configured to measure a power of a first phase of the multiphase system;
• a display configured to display measured results of the first power-measuring device and of a second power-measuring device;
• a processor configured to receive and process operating inputs for the first power-measuring device and the second power-measuring device;
• and
• a communicator configured to communicate with the second power-measuring device,
• wherein the first power-measuring device is configured, jointly with the second power-measuring device, to measure a power at least of the first phase and of a second phase of the multiphase system,
• the second power-measuring device comprising:
• a display configured to display measurement results, and
• a processor configured to operate the second power measuring device by a user,
• wherein each power-measuring device is connected to a single phase, and has the ability to measure the single phase,
• wherein a timestamp is integrated into a synchronization message,
• wherein a respective response to the synchronization message contains both the timestamp of the synchronization message and a response timestamp,
• wherein the first power measuring device and the second power measuring device are controlled via an operating unit of either the first power measuring device or the second power measuring device, and
• wherein the first power-measuring device is operable either as a master-mode or a slave-mode and when the first power measuring device is operated in the slave-mode the measured results are displayed on the display of the second power measuring device.