Toshiba GR 200 Series, Инструкция по эксплуатации

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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 413 -
2.27.1
Selection of breaker system
A single breaker arrangement (1CB) is applied and the protection function is required to
operate in the 1CB, the user should set
1CB
for the scheme switch [
CB-System
]. When a single-
and-a-half breaker arrangement system (1.5CB) is applied, the user should set
2CB
for the
scheme switch. (2.84.8)
2.27.2
Decision of CB open/close status
Circuit-breaker auxiliary-contact is used to state the CB status; a normal-open contact (N/O)
and a normal-close contact (N/C) can be furnished in the CB. Thus, as to the phase-A contact
of the CB, signals “CB1-A_NO_CONT” and “CB1-A_NC_CONT” can be used to represent the
CB status in phase-A (i.e., tripped or closed in phase-A). The PROT_COMM function can decide
the CB status using the both signals; the decision generated will be provided for other
protection functions so that the IED can operate in accordance with the CB status.
(i)
Signal option
As the CB auxiliary-contacts (N/O and/or N/C) may generate the signals, the user should set
the rule for the decision. When the N/O signal is generated but the N/C signal is not generated,
set
NO
for the scheme switch [
CB1-Contact
] so that the PROT_COMMON function can decide
the CB state using only the N/O. Conversely, the decision should be made with only the N/C,
NC
is set for this scheme switch. When both N/O and the N/C used, set
Both
for the scheme
switch [
CB1-Contact
]†.
†Note: When the IED operates for the 1.5CB arrangement (i.e., two CBs are connected
with the IED), the user should set the scheme switches [
CB1-Contact
] and [
CB2-
Contact
] both.
(ii)
Contact supervision
Table 2.27-2 exemplifies the rules between the CB main-contact and the CB auxiliary-contact.
Given that the main-contact is open, the N/O is open and the N/C is closed; however if the both
are open when the main contact is open, we should decide the information generated in the
PROT_COMMON is not true (say, an incorrect signal is generated). The contact supervision
can find the inconsistency in the decisions using the rule of Table 2.27-2.
Table 2.27-2 Main and Auxiliary contacts within CB
Main contact
OPEN CLOSED
Auxiliary contacts
N/O
OPEN CLOSED
N/C CLOSED OPEN
The user should set
On
for the scheme switch [
CB-SV
] when the operation of the contact