Mains Decoupling - Woodward easYgen-2000 Series User Manual

ID Parameter
5813 Lower fre‐
quency limit
5817 Hysteresis
lower fre‐
quency limit
4.4.2.2

Mains Decoupling

General notes
Managing Breaker Open alarm
37535B
CL Setting range Description
[Default]
2 50.0 to 100.0 % The maximum permissible negative deviation of the mains frequency from the
rated system frequency (parameter
[90.0 %]
value may be used as a frequency limit switch. The conditional state of this
switch may be used as a command variable for the LogicsManager (02.10).
2 0 to 50.0 % If the mains frequency has exceeded the limit configured in param‐
eter
[0.5 %]
configured here, to be considered as being within the operating limits again.
The mains decoupling function is intended for use in a mains par‐
allel operation and monitors a series of subordinate mains protec‐
tion thresholds. If a threshold is exceeded, the easYgen initiates a
breaker opening and separates the generator(s) from the mains at
the defined breaker.
The following thresholds are monitored:
Overfrequency level 2 (
n
quency (Level 1 & 2) ANSI# 81O" on page 138 )
Underfrequency level 2 (
n
quency (Level 1 & 2) ANSI# 81U" on page 140 )
Overvoltage level 2 (
n
(Level 1 & 2) ANSI# 59" on page 141 )
Undervoltage level 2 (
n
(Level 1 & 2) ANSI# 27" on page 142 )
Mains phase shift (
n
on page 151 )
If one of these protective functions is triggered, the display indi‐
cates "Mains decoupling" (the logical command variable "07.25"
will be enabled) and the active level 2 alarm.
When the mains decoupling function detects a breaker open
failure, the according breaker alarm will be triggered as long the
monitoring function is activated. Additionally in cases where the
decoupling mode has to change over to the other breaker,
(GCB®MCB, MCB®GCB), the alarm text "Decoupling
GCB«MCB" is indicated. The breaker open alarm already
occurres after the mains decoupling feedback delay (refer to ID
3113 Ä p.
easYgen-2200/2500 | Genset Control
Configure Monitoring > Mains > Mains Decoupling
5813 Ä p. 137, the frequency mustraise above the limit and the value
Ä Chapter 4.4.2.3 "Mains Overfre‐
Ä Chapter 4.4.2.4 "Mains Underfre‐
Ä Chapter 4.4.2.5 "Mains Overvoltage
Ä Chapter 4.4.2.6 "Mains Undervoltage
Ä Chapter 4.4.2.10 "Change Of Frequency"
The mains decoupling function is optimized on the
both relay outputs "GCB open" and "MCB open". In
case of using a free relay output in conjunction with the
command variable 07.25 an additional delay time of up
to 20 ms is to consider.
138).
Configuration
1750 Ä p. 94) is configured here. This
137