Toshiba GR200 Series Instruction Manual page 111
Centralized busbar protection ied
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Under-voltage element for phase-to-earth voltage (UVFS)
2.3.1
The UVFS measures a phase-to-earth voltage and its sensitivity is set with setting [UVFS].
The operation of the UVFS is initiated when the phase-to-earth voltage drops below the setting
and the On setting is selected for the scheme switch [UVFS-EN].
Under-voltage element for phase-to-phase voltage (UVSFS)
2.3.2
The UVSFS measures a phase-to-phase voltage and if the value is below setting [UVSFS],
UVSFS is initiated. The setting [UVSFS] is enabled when the On setting is selected for the
scheme switch [UVSFS-EN].
Under-voltage change detection element (UVDFS)
2.3.3
This element operates if the voltage drops below a setting voltage compared to that of the
previous cycle. The sensitivity of the UVDFS is configured by setting [UVDFS]. In addition, the
UVDFS has off-delay timers and setting [TUVDFS] is provided to set the timers. The On setting
is selected for the scheme switch [UVDFS-EN].
Table 2.3-2 UV, UVS and UVDFS setting switches
Setting items
Mode / range
UVFS-EN
UVFS
UVSFS-EN
UVSFS
UVDFS-EN
UVDFS
0.00 – 300.00
TUVDFS
Scheme logic
2.3.4
Figure 2.3-1 shows the decision logic in the FS function; each element has a scheme switch
that can either enable or disable operation.
Unit
On
–
Off
5.0 – 130.0
V
On
–
Off
5.0 – 130.0
V
On
–
Off
1 – 20
V
s
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Contents
UV relay operation in Fail-safe (FS)
Canceling UV relay operation in FS
UV relay operation threshold
UVS relay operation in Fail-safe (FS)
Canceling UVS relay operation in FS
UV relay operation threshold
UVD relay operation in Fail-safe (FS)
Canceling UVD relay operation in FS
UVD relay operation threshold
Delayed drop-off timer for UVD
6F2S1931 (0.20)
Default
On
46.0
On
80.0
On
5
10.10
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
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