Functions
2.6 Voltage Protection 27, 59
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
149
Current Criterion for Undervoltage Protection
The 27-1 element and the 27-2 element can be supervised by the current flow monitoring setting. If the
CURRENT SUPERV.
is switched ON at address
5120
(factory setting), the release condition of the current cri-
terion must be fulfilled in addition to the corresponding undervoltage condition, which means that a configured
minimum current (
BkrClosed I MIN
, address
212
) must be present to make sure that this protective function
can pick up. Thus it can be achieved that pickup of the undervoltage protection drops out when the line is dis-
connected from voltage supply. Furthermore, this feature prevents an immediate general pickup of the device
when the device is powered-up without measurement voltage being present.
Note
If parameter
CURRENT SUPERV.
is set to disabled at address
5120
, the device picks up immediately if the
measuring-circuit voltage fails and the undervoltage protection is enabled. Furthermore, configuration can be
performed by pickup of measuring-circuit voltage or blocking of the voltage protection. The latter can be initiat-
ed via device operation in DIGSI and via communication from the control center by means of a tagging
command for blocking the voltage protection. This causes the dropout of the pickup and parameterization can
be resumed.
Please note that pickup threshold
BkrClosed I MIN
is used in other protective functions as well, including
overload protection, restart inhibit for motors, dynamic cold load pickup and circuit breaker maintenance.
2.6.5
Settings
Addresses which have an appended "A" can only be changed with DIGSI, under "Display Additional Settings".
Addr.
Parameter
Setting Options
Default Setting
Comments
5001
FCT 59
OFF
ON
Alarm Only
OFF
59 Overvoltage Protection
5002
59-1 PICKUP
40 .. 260 V
110 V
59-1 Pickup
5003
59-1 PICKUP
40 .. 150 V
110 V
59-1 Pickup
5004
59-1 DELAY
0.00 .. 100.00 sec;
∞
0.50 sec
59-1 Time Delay
5005
59-2 PICKUP
40 .. 260 V
120 V
59-2 Pickup
5006
59-2 PICKUP
40 .. 150 V
120 V
59-2 Pickup
5007
59-2 DELAY
0.00 .. 100.00 sec;
∞
0.50 sec
59-2 Time Delay
5015
59-1-V2 PICKUP
2 .. 150 V
30 V
59-1 Pickup Overvoltage (neg.
seq.)
5016
59-2-V2 PICKUP
2 .. 150 V
50 V
59-2 Pickup Overvoltage (neg.
seq.)
5017A
59-1 DOUT RATIO
0.90 .. 0.99
0.95
59-1 Dropout Ratio
5018A
59-2 DOUT RATIO
0.90 .. 0.99
0.95
59-2 Dropout Ratio
5019
59-1 PICKUP V1
40 .. 150 V
110 V
59-1 Pickup V1
5020
59-2 PICKUP V1
40 .. 150 V
120 V
59-2 Pickup V1
5101
FCT 27
OFF
ON
Alarm Only
OFF
27 Undervoltage Protection
5102
27-1 PICKUP
10 .. 210 V
75 V
27-1 Pickup
www
. ElectricalPartManuals
. com
