Table of Contents
Advertisement
This setting defines the characteristic of the inverse curve. Standard ANSI and IEC curves are provided. The
characteristic can also be set as DTL. This increases the number of DTL elements that are available if more are
required. A 51 element can provide a DTL operate and DTL reset characteristic if that is required.
Set the characteristic to suit your application.
Gn 51-n Time Mult (if Gn 51-n Char is set as IEC/ANSI)
Default Setting: 1.00
This setting defines the time multiplier that is applied to the selected current curve. For IEC curves, this value is
traditionally in the range of 0.01 to 10 and for ANSI curves, a value of 0.01 to 10 is typically applied.
Gn 51-n Delay (if Gn 51-n Char is set as DTL)
Default setting: 5.00 s
This should be set to suit the individual application. If any other characteristic curve is selected, this setting is
not used.
Gn 51-n MinOperate
Default setting: 0.00 s
With this parameter, a minimum operate delay time can be selected. The operate delay time of the
inverse‑time characteristic curve never falls below the minimum operate delay time.
[dw_7SR46_minimumoperatingtimecurve, 1, en_US]
Figure 3-4
This is traditionally used with recloser systems only and otherwise is recommended to be left at the default
setting of 0 s.
Gn 51-n Follower
Default setting: 0.00 s
This setting allows an additional time to be added to that achieved by the selected characteristic curve. It is
applied as a DTL time after the operate state from the curve is achieved. With this setting, the whole curve is
shifted linearly on the time axis by this additional definite time.
This is traditionally used with recloser systems only and otherwise is recommended to be left at the default
setting of 0 s.
Gn 51-n Reset
Default setting: 0.00 s
Reyrolle, 7SR46 Device, Manual
C53000-G7040-C103-1, Edition 10.2022
Minimum Operating Time of the Curve
3.4 51 Time-Delayed Overcurrent – Phase
Functions
47
Advertisement
Table of Contents
