11.5 Interlocking
11.5.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Logical node for interlocking SCILO - 3
Interlocking for busbar grounding switch BB_ES - 3
Interlocking for bus-section breaker A1A2_BS - 3
Interlocking for bus-section
disconnector
A1A2_DC - 3
Interlocking for bus-coupler bay ABC_BC - 3
Interlocking for 1 1/2 breaker diameter BH_CONN - 3
Interlocking for 1 1/2 breaker diameter BH_LINE_A - 3
Interlocking for 1 1/2 breaker diameter BH_LINE_B - 3
Interlocking for double CB bay DB_BUS_A - 3
Interlocking for double CB bay DB_BUS_B - 3
Interlocking for double CB bay DB_LINE - 3
Interlocking for line bay ABC_LINE - 3
Interlocking for transformer bay AB_TRAFO - 3
11.5.2 Application
The main purpose of switchgear interlocking is:
• To avoid the dangerous or damaging operation of switchgear
• To enforce restrictions on the operation of the substation for other reasons for
example, load configuration. Examples of the latter are to limit the number of parallel
transformers to a maximum of two or to ensure that energizing is always from one
side, for example, the high voltage side of a transformer.
This section only deals with the first point, and only with restrictions caused by switching
devices other than the one to be controlled. This means that switch interlock, because of
device alarms, is not included in this section.
Disconnectors and grounding switches have a limited switching capacity. Disconnectors
may therefore only operate:
Section 11 1MRK 506 334-UUS A
Control
346
Application manual
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