Regulus uREG, User Manual

Page: 35 / 107

uREG User Manual
35
7.8. VT-3 / VT-4 / VT-8 MODULE (SLOT #2)
The VT-3 module with double v oltage t ransformers is mainly designed for supporting
automation solutions at wind plants.
The
VT-3 module houses 2 sets of 4 measuring transformers for voltages U1, U2, U3 and 3
current transformer for If.
Terminals of the
VT-3 module are grouped into 3 x Phoenix-Contact/Wieland slots:

6-pin MSTBA2.5/6-G strip (pitch: 5.00 mm, max 12 A, 250 V) for measurement of
U0, U1, U2, U3 voltages in section 1 within the range (Un: 100 V) = 0 ÷ 130V;

6-pin MSTBA2.5/6-G strip (pitch: 5.00 mm, max 12 A, 250 V) for measurement of
U0, U1, U2, U3 voltages in section 2 within the range (Un: 100 V) = 0 ÷ 130V;

6-pin GMSTBA2.5/6-G strip (pitch: 5.00 mm, max 12 A, 400 V) for measurement of
current
If within the range (In: 1 A) = 0 ÷ 10 A.
Fig. 7.8. Terminals of the VT-3 module.
The VT-3 module (combined with CT-0 ) is required for fulfillment of the following protective
criteria and functions:

Overvoltage U> [in Section 1 and 2] • Power directional

Tripped overvoltage U>T [in Section 1 and 2] • Internal fSPZ/SCO

Overcurrent earth-fault criterion I>

Undervoltage U< [in Section 1 and 2] • Susceptance B0kier.>

Undervoltage U<T [in Section 1 and 2] • Conductance G0>

Difference of sectional voltages [1-2] • Conductance G0>kier.

Frequency [in Section 1 and 2] • Admittance Y0>

Frequency derivative df/dt> • Admittance YY0>

Voltage derivative dU/dt • Overpower for 3-phase reactive power (1 min.) Q3f>

Second harmonic f100Hz> • Underpower for 3-phase reactive power (1 min.) Q3f<

BKR capacitor bank control

AWSCz automatic unit controller

Synchro-check on both sections

deltaf< [Section 1-2]
The VT-4 module is identical in terms of functionality, but it features increased measurement
threshold for voltages U1, U2, U3 within the range 5 – 260 V (optionally 500 V AC) .
The VT-8 module is a functional equivalent to the VT-4 module; additionally, it has current
transformers for rated current In = 5 A .