Measurement filtering

Measurement filtering averages values over a configurable period of time.

On a system, the measurement varies continuously depending on the following:

To prevent the display from fluctuating and to avoid inappropriate alarms, the measurements are filtered for 4 s, 40 s or 160 s.

The Filtering parameter offers a choice between the following three modes:

Filtering	Description	Example of use	Measurement update time when monitoring the insulation	Response time required to detect an insulation fault
4 s	Optimizes the response time: Manual fault location phase Automatic location of a transient fault	To facilitate manual location of a fault by opening each of the circuit breakers in turn	0.8 s	4 s
40 s	Suitable for most applications	–	8 s	40 s
160 s	Suitable for highly demanding applications	To be used for severely disrupted power supply systems or for photovoltaic applications	32 s	160 s

Filtering

Description

Example of use

Measurement update time when monitoring the insulation

Response time required to detect an insulation fault

4 s

Optimizes the response time:

To facilitate manual location of a fault by opening each of the circuit breakers in turn

0.8 s

4 s

40 s

Suitable for most applications

–

8 s

40 s

160 s

Suitable for highly demanding applications

To be used for severely disrupted power supply systems or for photovoltaic applications

32 s

160 s

The default value for the Filtering parameter is 40 s.