Siemens SIPROTEC 7UT613 series User Manual

2.14 Undervoltage Protection
257
7UT613/63x Manual
C53000-G1176-C160-2
The respective delay time T U< (address 5213) is supposed to bridge the permissible
short-term voltage dips during continuous undervoltage, which may lead to an unsta-
ble operation, however, it is supposed to be switched off within a few seconds.
For the U<< stage, a lower pickup threshold with a short delay should be set so that
in case of heavy voltage dips a quick trip can occur, e.g. 65 % of the nominal voltage
with 0.5 s delay.
If the undervoltage protection is assigned to one side of the main protected object or
the three-phase busbar, the pickup value must be set as reference value under
address 5215 U<<, e.g. 0.65. When assigned to a measuring location, the value of
phase-phase voltage must be set under address 5214 U<< in Volt, e.g. 71.5. V at
U
N sec
= 110 V (65 % of 110 V).
The set times are additional time delays that do not include the operating time (mea-
suring time, dropout time) of the protection function. If a delay time is set to ∞, this
does not result in a trip, however, the pickup will be indicated.
Dropout Ratio The drop-out ratio can be adjusted to the operating conditions at address 5217 DOUT
RATIO. This parameter can only be altered in DIGSI at Additional Settings.
2.14.3 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
2.14.4 Information List
Addr. Parameter Setting Options Default Setting Comments
5201 UNDERVOLTAGE OFF
ON
Block relay
OFF Undervoltage Protection
5211 U< 10.0 .. 125.0 V 75.0 V U< Pickup
5212 U< 0.10 .. 1.25 U/UnS 0.75 U/UnS Pick-up voltage U<
5213 T U< 0.00 .. 60.00 sec; ∞ 3.00 sec T U< Time Delay
5214 U<< 10.0 .. 125.0 V 65.0 V U<< Pickup
5215 U<< 0.10 .. 1.25 U/UnS 0.65 U/UnS Pick-up voltage U<<
5216 T U<< 0.00 .. 60.00 sec; ∞ 0.50 sec T U<< Time Delay
5217A DOUT RATIO 1.01 .. 1.20 1.05 U<, U<< Drop Out Ratio
No. Information Type of In-
formation
Comments
033.2404 >BLOCK U/V SP >BLOCK undervoltage protection
033.2411 Undervolt. OFF OUT Undervoltage protection is switched OFF
033.2412 Undervolt. BLK OUT Undervoltage protection is BLOCKED
033.2413 Undervolt. ACT OUT Undervoltage protection is ACTIVE
033.2491 U< err. Obj. OUT Undervoltage: Not avail. for this obj.
033.2492 U< err. VT OUT Undervoltage: error assigned VT

Siemens SIPROTEC 7UT613 series Specifications

General

Brand	Siemens
Model	SIPROTEC 7UT613 series
Category	Protection Device
Language	English