Voltage input Device connections
Ua Q1, Q2
Ub Q3, Q4
Uc Q5, Q6
Ud Q7, Q8
Ue Q9, Q10
Uf Q11, Q12
Typically a phase-to-phase voltage is connected, a phase-earth voltage may also be used however. In the latter
case the pickup thresholds must be matched accordingly.
The first undervoltage protection stage is typically set to about 75% of the nominal machine voltage, i.e.
address 4002 U< = 75 V is set. The user must select a value for the 4003 T U< time setting that ensures that
voltage dips which would affect operating stability are disconnected. On the other hand, the time delay must
be large enough to avoid disconnections during admissible short-time voltage dips.
For the second stage, a lower pickup threshold 4004 U<< e.g. = 65 V should be combined with a shorter trip
time 4005 T U<< e.g. = 0.5 s to perform an approximate adaptation to the stability behaviour of the
consumers.
All setting times are additional time delays which do not include the operating times (measuring time, dropout
time) of the protective function.
The drop-out ratio can be adapted in small steps to the operating conditions at address 4006 U< DOUT
RATIO.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
Addr.
Parameter Setting Options Default Setting Comments
4001 UNDERVOLTAGE OFF
ON
Block relay
OFF Undervoltage Protection
4002 U< 10.0 .. 125.0 V 75.0 V U< Pickup
4003 T U< 0.00 .. 60.00 sec 3.00 sec T U< Time Delay
4004 U<< 10.0 .. 125.0 V 65.0 V U<< Pickup
4005 T U<< 0.00 .. 60.00 sec 0.50 sec T U<< Time Delay
4006A U< DOUT RATIO 1.01 .. 1.20 1.05 U<, U<< Drop Out Ratio
4007 MEAS. INPUT Ua
Ub
Uc
Ud
Ue
Uf
Ua Used Measuring Input
Information List
No.
Information Type of
Informa-
tion
Comments
6503 >BLOCK U/V SP >BLOCK undervoltage protection
6506 >BLOCK U< SP >BLOCK Undervoltage protection U<
6508 >BLOCK U<< SP >BLOCK Undervoltage protection U<<
6530 Undervolt. OFF OUT Undervoltage protection switched OFF
2.4.3
2.4.4
Functions
2.4 Undervoltage Protection
SIPROTEC 4, 7VE61 and 7VE63, Manual 83
C53000-G1176-C163-3, Edition 10.2017
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