Page 257 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
3 - Mechanical Interlocks
Mechanical interlocks determine the opening/closing logic between two or three circuit-breakers.
Four types of interlocks are available, usable in both fixed and withdrawable versions.

Mechanical interlock of type A - The Type A interlock is applicable to two circuit-breakers (normal power supply + emergency power supply).
Two Circuit-breakers It allows you never to have two circuit-breakers in the closed position at the same time.
1 2 Information on assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
O O particular with the kit sheets:
I O • 1SDH000999r0720 for interlock between E1.2circuit-breakers
• 1SDH001000r0720 for interlock between E2.2-E4.2-E6.2 circuit-breakers
O I
• 1SDH000999r0721 for interlock between one E1.2 circuit-breaker and one E2.2-E4.2-E6.2 circuit-breaker

Mechanical interlock of type B - The Type B interlock is applicable to three circuit-breakers (two normal power supplies + emergency power
Three Circuit-breakers supply).
1 2 3 It only allows the closing of the two circuit-breakers of the normal power supply if the circuit-breaker of the
emergency power supply is open. The circuit-breaker of the emergency power supply can be closed only if
O O O
the others two are open.
I O O
Information on the assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
O O I
particular with the kit sheet 1SDH001000r0721.
I O I

O I O
Mechanical interlock of type C - The Type C interlock is applicable to three circuit-breakers (two normal power supplies + a bus tie).
Three Circuit-breakers It allows the simultaneous closing of one or two circuit-breakers, resulting in two possible types of power
1 2 3 supply of the half busbars:
O O O • power supply from a single transformer (bus tie closed)
• power supply from both transformers (bus tie open)
I O O

O I O
Information on the assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
O O I
particular with the kit sheet 1SDH001000r0722.
O I I

I I O
I O I
Mechanical interlock of type D - The Type C interlock is applicable to three circuit-breakers (three power supplies on the same bar that must
Three Circuit-breakers not operate in parallel)
1 2 3 It allows only one of the three circuit-breakers to be closed.
O O O Information on the assembly is available on the website http://www.abb.com/abblibrary/DownloadCenter/, in
I O O particular with the kit sheet 1SDH001000r0723.
O I O
O O I

Operating coil trip time setting Before the trip command of a YC release on the circuit-breaker (B) which activates an interlock, make sure
on interlocked circuit-breakers that at least 60ms have passed since the energizing of release YU or from the de-energizing of release YO -
YO2 on the circuit-breaker to be interlocked (A).

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Figure 138

255 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Mechanical accessories | 3 - Mechanical Interlocks