FUNCTIONAL DESCRIPTION
3-1
A U X .
T A R G E T
A U X .
A U X .
A U X .
P O W E R
S U P P L Y
S T A T U S
O V T I M E
D I A L
O V
T I M E R
T I M E D
O V
C O M P A R A T O R
O V
P I C K U P S E T T I N G S
INST.
T I M E D
U N D E R
O V E R
U N D E R
O V E R
U V T I M E
D I A L
U V
T I M E R
T I M E D
U V
C O M P A R A T O R
U V
INST.
O V
C O M P A R A T O R
INST.
U V
C O M P A R A T O R
P O W E R
S U P P L Y
S E N S O R
U V
P O W E R
S U P P L Y
S E N S O R
T O I N T E R N A L
C I R C U I T R Y
F U L L - W A V E
R E C T I F I E R
L O W - P A S S
F I L T E R
M O N I T O R E D
V O L T A G E
O P E R A T I N G
P O W E R
D 2 3 5 4 - 0 3
0 3 - 1 1 - 9 6
T A R G E T
T A R G E T
T A R G E T
SECTION 3 • FUNCTIONAL DESCRIPTION
GENERAL
The BE1-27 Undervoltage, BE1-59 Overvoltage, and BE1-27/59 Under/Overvoltage Relays are static
devices which respond to the voltage magnitude of the monitored circuit. Figure 3-1 is a functional block
diagram of the BE1-27/59 Under/Overvoltage Relay.
Figure 3-1. Functional Block Diagram
SYSTEM VOLTAGES
The BE1-27, BE1-59, and BE1-27/59 relays are available with three sensing input ranges. The 55 to 160V
range is intended for use with nominal system voltages of 120V or 69V (120/ 3). The 110 to 320 volt range
is intended for use with nominal system voltages of 240V, 208V (120 X 3), or 277V (480/ 3). The 1 to 40V
range is intended for use with a wye/broken delta PT configuration with 120V or 69V (120/ 3) line-to-ground
secondary voltages. The wye/broken delta PT configuration is a zero sequence filter capable of producing
three times the line-to-ground voltage (3Vo).
Summary of Contents for BE1-27
Page 22: ...4 4 INSTALLATION Figure 4 3 S1 Case Single Ended Projection Mount Outline Dimensions Side View...
Page 24: ...4 6 INSTALLATION Figure 4 5 S1 Case Double Ended Projection Mount Outline Dimensions Side View...
Page 26: ...4 8 INSTALLATION Figure 4 7 S1 Case Single Ended Projection Mount Outline Dimensions Rear View...
Page 29: ...INSTALLATION 4 11 Figure 4 10 S1 Case Panel Drilling Diagram Semi Flush Mounting...
Page 32: ...4 14 INSTALLATION Figure 4 13 BE1 27 Internal Connections...
Page 33: ...INSTALLATION 4 15 Figure 4 14 BE1 59 Internal Connections...
Page 34: ...4 16 INSTALLATION Figure 4 15 BE1 27 59 Internal Connections...