Toshiba GR200 Series Instruction Manual page 700
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Also See for GR200 Series:
- Instruction manual (1770 pages) ,
- Instruction manual (1051 pages) ,
- Instruction manual (996 pages)
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Phase-angle variance (Δθ) (see Figure 4.6-4)
The phase-angle variance of Vr and Vi (Δθ) is measured by the phase-angle variance-relay
having the setting [SyncRy1-Angle]. If the following equations are satisfied, the SyncRy1-
Angle relay determines that the phase-angle variance is inside the permissible range.
V
× V
r
Frequency-variance (Δf)
The frequency-variance of Vr and Vi (Δf) is measured by the frequency-variance relay having
the setting [SyncRy1-df]. If the following equations are satisfied, the SyncRy1-df relay
determines that the frequency-variance is inside the permissible range.
where,
f
Vr
f
Vi
Δf
Notice and tips
If the frequency-variance between the Vr and the Vi is shown very large, the SYNCHK may
fail to make the decision of the synchronism, although Off is set for the setting [SyncRy1-dfEN]
to abandon to checking the frequency-variance. This is because; the vector passes the [SyncR1-
Angle] zone very quickly. As a result, the SYNCHK relay may fail to issue the permission
command. To avoid the failure, the user has to set values for settings [SyncR1-Angle] and
[SYNC01_TSYN] depending on the assumed frequency-variance (Δf):
where,
Tips: Cycles for the synchronism closure can be calculated:
Time length for getting a synchronism:
V
× V
cos ∆θ > 0
r
i
sin ( setting[SyncRy1-Angle] ) ≥ V
i
∆f = | f
| ≤ setting [SyncRy1-df]
− f
Vi
Vr
Frequency of Vr
Frequency of Vi
Frequency-variance between Vr and Vi
Setting [SyncR1-Angle]
∆f >
180° × Setting [SYNC01_TSYN]
Δf= Frequency-variance (or cycle-slip in Hertz)
Cycle for synchronism = 1 ∆f[Hz]
- 679 -
× V
sin ∆θ
r
i
⁄
GRZ200 (Soft 031 & 032)
6F2S1915 (0.46)
(4.6-4)
(4.6-5)
(4.6-6)
(4.6-7)
(4.6-8)
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