Siemens 7SC80 Manual page 433

If the protection function is switched ON, tripping is initiated, a trip log started, and fault recording is triggered
if the limit has been exceeded and the time delay has elapsed.
When setting Alarm Only, no trip command is given, no trip log is initiated, and no spontaneous fault indi-
cation is issued.
Overvoltage Protection 59 of Side 2 with Phase-to-Phase or Phase-to-Ground Voltages
The largest of the applied voltages is evaluated for the phase-to-phase or phase-to-ground overvoltage protec-
tion.
The threshold values are set in the value to be evaluated (see Section
The Overvoltage protection 59 of side 2 function has two elements. The pickup value of the lower threshold
(address 5602 or 5603, 59-1 PICKUP S2, depending on the phase-to-ground or the phase-to-phase
voltages, can be assigned a longer time delay (address 5605, 59-1 DELAY S2) and the upper threshold
element (address 5606 or 5607, 59-2 PICKUP S2) a shorter (address 5609, 59-2 DELAY S2) time delay.
There are no specific procedures on how the pickup values are set. However, as the function is mainly used to
prevent high insulation damage to system components and users, the threshold value 5602 , 5603 59-1
PICKUP S2 lies generally between 110 % and 115 % of the nominal voltage and setting value 5606, 5607
59-2 PICKUP S2 at approximately 130 %.
The time delays of the overvoltage elements are entered at addresses 5605 59-1 DELAY S2 and 5609 59-2
DELAY S2, and should be selected in such manner that they make allowance for brief voltage peaks that are
generated during switching operations and also enable clearance of stationary overvoltages in due time.
The choice between phase-to-ground and phase-to-phase voltage allows voltage asymmetries (e.g. caused by
a ground fault) to be taken into account (phase-to-ground) or to remain unconsidered (phase-to-phase)
during evaluation.
Overvoltage Protection of Side 2 - Positive Sequence System V1 S2
In a 3-phase voltage transformer connection the positive sequence system can be evaluated for the over-
voltage protection by means of configuring parameter 616 OP. Quan.59 S2 to V1. In this case, the
threshold values of the overvoltage protection must be set in parameters 5604 59-1 PU V1 S2 or 5608
59-2 PU V1 S2.
Dropout Threshold of the Overvoltage Protection of Side 2
The dropout thresholds of the 59-1 S2 element and the 59-2 S2 element can be configured via the dropout
ratio r = V /V
Dropout
condition applies to r:
r · (configured pickup threshold) ≤ 150 V with connection of phase-to-phase voltages and phase-to-ground
voltages or
r · (configured pickup threshold) ≤ 260 V with calculation of the measured values from the connected voltages
(For example, phase-to-phase voltages calculated from the connected phase-to-ground voltages).
The minimum hysteresis is 0.6 V.
Phase-Specific Pickup Voltages of the Overvoltage Protection of Side 2
The phase-specific pickup voltages of the two overvoltage protection of side 2 elements are set at the
following addresses:
59-1Ph2A Pickup
59-1Ph2B Pickup
59-1Ph2C Pickup
59-2Ph2A Pickup
59-2Ph2B Pickup
59-2Ph2C Pickup
The settable voltage range depends on the type of connection of either phase-to-phase voltage or phase-to-
ground voltage (parameter 219). For phase-to-phase connection, phase 1 corresponds to the connection 2A -
2B, phase 2 2B - 2C, and phase 3 corresponds to the connection 2C - 2A.
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
at addresses 5610 59-1 DOUT S2 or 5611 59-2 DOUT S2. The following marginal
Pickup
Address 5612 or 5613
Address 5614 or 5615
Address 5616 or 5617
Address 5618 or 5619
Address 5620 or 5621
Address 5622 or 5623
2.30 Additional Applications with 6 Voltage Inputs
2.30.2.2 Measurement
Functions
Principle).
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