![background image](http://html1.mh-extra.com/html/abb/rec650-ansi/rec650-ansi_applications-manual_3390438056.webp)
difference between the inverse time curves is 0.4 s. With the setting
TD4
= 0.15 the
time margin between the characteristics is about 0.4 s as shown in figure
.
IEC09000453 V1 EN
Figure 9:
Inverse time operation characteristics for selectivity
3.1.6
Calculating settings for four step residual overcurrent
protection, zero or negative sequence direction HV-side
EF4PTOC (51N/67N)
The protection is fed from the 145 kV neutral point of the current transformer.
Section 3
1MRK 511 286-UUS A
REC650 setting examples
50
Application manual
Summary of Contents for REC650 ANSI
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