ABB RELION 670 Series Technical Manual page 568

Generator protection

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Current protection

delay characteristic which matches the heating characteristic of the generator

defined in standard IEEE C50.13.

NS2PTOC (46I2) has a wide range of

tripping for negative sequence currents down to the continuous capability of a generator.

In order to match the heating characteristics of the generator a reset time parameter can be set.

A separate definite time delayed output is available as an alarm feature to warn the operator of a

potentially dangerous situation.

Function block

ANSI08000359 V3 EN-US

Figure 298: NS2PTOC (46I2) function block

Table 299: NS2PTOC (46I2) Input signals

is negative sequence current expressed in per unit of the rated generator

is operating time in seconds

is a constant which depends of the generators size and design

NS2PTOC (46I2)

ANSI08000359.vsdx

K settings and the sensitivity and capability of detecting and

Group connection for neg seq.

Block of function

Block of step 1

Block of step 2

Block of trip signals

1MRK 502 066-UUS B

GUID-7071A62D-AB87-43C4-922A-1DD2E6DD5623 v2

PID-3854-INPUTSIGNALS v5

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