Dropout Threshold of the Undervoltage Protection
The dropout thresholds of the 59-1 element and the 59-2 element can be parameterized via the dropout ratio
r = V
dropout
/V
pickup
(5113 27-1 DOUT RATIO or 5114 27-2 DOUT RATIO). The following marginal condition
applies to r:
r · (configured pickup threshold) ≤ 120 V with connection of phase-to-phase voltages and phase-to-ground
voltages) or
r· (configured pickup threshold) ≤ 210 V with calculation of the measured values from the connected voltages
(e.g. calculated phase-to-phase voltages from the connected phase-to-ground voltages).
The minimum hysteresis is 0.6 V.
NOTE
If a setting is selected such that the dropout threshold (= pickup threshold · dropout ratio) results in a
greater value than 120 V/210 V, it will be limited automatically. No error message occurs.
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
criterion must be fulfilled in addition to the corresponding undervoltage condition, which means that a config-
ured 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 disconnected 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
initiated 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 parame-
terization 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.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “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.)
2.6.5
Functions
2.6 Voltage Protection 27, 59
SIPROTEC 4, 7SJ62/64, Manual 135
C53000-G1140-C207-8, Edition 08.2016
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