Entec ETMFC610 - Frequency (81)

Multi-Function Control ETMFC610 http://www.entecene.co.kr
278
EN
HANCED
TEC
HNOLOGY
5) NEQ OVERVOLT 1 Setup
The negative sequence overvoltage 1 settings process a very similar method to the overvoltage 1.
However, there is no setting menu for voltage type.
6) NEQ OVERVOLT 2 Setup
The negative sequence overvoltage 1 settings process a very similar method to the overvoltage 1.
However, there is no setting menu for voltage type.
8.5.3. Frequency (81)
Place the curser on “FREQUENCY” in MONITORING menu, press [ENT] button to move into
this menu. In this menu, underfrequency, overfrequency and frequency delay elements will be
described. And the frequency menu is composed with 6 sub-menus as follows:
8.5.3.1. Underfrequency (81U)
The underfrequency element is activated to alarm when the distribution system frequency drops
below a specified frequency pickup for a specified time. The power system frequency is measured
from the zero crossing on the VA-N voltage input for Wye connected VTs and VA-B voltage for
Delta connected VTs.(If VTs is delta connection(

), V
A-B
voltage is zero crossing and if wye
connection(Y), V
A-N
voltage zero crossing to measure frequency.)
The underfrequency minimum voltage and underfrequency minimum current are used to prevent
incorrect operation when dead line.
[FREQUENCY]
>1.UNDER FREQUENCY1
2.UNDER FREQUENCY2
3.OVER FREQUENCY1
4.OVER FREQUENCY2
5.FREQUENCY DELAY