ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS751802-MUM
REX 521
103
Protection Relay
Technical Reference Manual, Standard Configurations
7.1.13. SYNC1
The function block is designed to be used for checking the conditions for circuit-
breaker closing. The function can be used for closing ring mains, interconnecting
busbars and connecting generators to the network. The harmonics are suppressed.
Fig. 7.1.13.-1 Function block symbol of SYNC1
Reset time 140...1000 ms
(Depends on the minimum pulse width set
for the trip output)
Operate time accuracy ±2.0% of set value or ±30 ms
System frequency protection, f1 and f2 (Continued)
In sensor standard configurations (H01S and H03S) the parameter
Control settings\Voltage combine must be enabled and
in transformer standard configuration (H03) it must be disabled. The
parameter is by default in the correct mode.
Synchro-check, SYNC1
Umax (Upper threshold voltage) 0.50...1.00 x Un
Umin (Lower threshold voltage) 0.10...0.80 x Un
dU (Voltage difference) 0.02...0.60 x Un
dphase (Phase angle difference) 5...90°
df (Frequency difference) 0.02...5.00 Hz
Energizing mode Not in use
U1->U2, U2->U1
U1->U2
U2->U1
U1>U2,U2>U1,0>0
Operation mode Command mode
Continuous mode
Synchro mode Not in use
Asynchr. Mode
Synchr. Mode
Operate time 0.10...20.0 s
Check time 0.05...300.0 s
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy Voltage measurement: ±2.5% of set value or ± 0.01 x Un
Frequency measurement: ±10 mHz
Phase angle measurement: ±2°
Reset time < 50 ms
Reset ratio typically 0.975 x Un
Operate time accuracy ±2% of set value or ±20 ms
SYNC
Command SC_OK

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English