ABB AKD-5 Installation Manual page 32

Programmer Secondary Disconnect (Breaker Side—N/A)
Programmer secondary disconnects are not provided on AKD5 legacy LVS breakers. If the customer chooses to use
the advanced features of the EntelliGuard ACB, the control wiring is routed from the LVS directly to the secondary
disconnect landing points on the cassette assembly of the EntelliGuard R cassette. Refer (Table 9 and Table10)
featuring the two 39-blocks (A and B) that make up the 78-point secondary-disconnects.
Neutral Disconnect Assembly for Breaker – (Now Mounted to Rear of New
Cassette). Refer to . (4 wire Ground Fault Only)
Table 8
When a legacy AK or AKR breaker of this type is replaced with a retrofill EntelliGuard R circuit breaker with 4-wire GF
in AKD-5 or AKD-6 switchgear, the incoming wires from the neutral CT typically connect to the Equipment Neutral
disconnect on the floor of the switchgear compartment. The Equipment Neutral Disconnect must be the type with
two spring loaded moving plungers in a phenolic block. The plunger on the left facing into the compartment should
be labeled as "TAP" and the plunger to the right should be labeled as "COM". Older single-Pin type Neutral
disconnects similar to an old RCA plug used with Power Sensor cannot be used and must be removed and replaced.
The Equipment Neutral Disconnect's two plungers that typically mated with two metal straps on a phenolic block
(aka the Breaker Neutral Disconnect) will be mating, in the retrofill system, with the "Neutral Disconnect" mounted to
a sliding bracket fastened to the rear of the cassette. It will be driven in to mate with the Equipment Neutral
Disconnect by the inward motion of the drawout breaker. SeeFigures13A-F.
Neutral Sensors for 4-Wire Ground Fault
The EntelliGuard R retrofill circuit breakers have an EntelliGuard TU Trip Unit that works with Rogowski sensors
installed internally on the 3 phases. For 4-wire ground fault it can either work with a Rogowski sensor in the
switchgear or it can work with an iron core Neutral CT by having its signal modified by GE's Neutral CT
Adapter. The adapter will convert the iron core CT current output to a Rogowski voltage output scaled to match the
phase sensors of the breaker.
The neutral CT adapters are not compatible with Neutral CT's used with "Power Sensor" Trip units or Neutral CT's
used with "SST" trip units. They are compatible with the Neutral CT Assemblies such as TSVG830BK, TSVG832BK
and TSVG940BK supplied with all 4-wire Trip Unit Conversion Kits sold since 1983. (The TSVG...BK Neutral CT w/
busbar assemblies were designed for the original MicroVersaTrip Conversion Kits with the same mounting hole
patterns as the old SST Neutral Sensors used in AKD-6 switchgear.)
The best approach for most systems is to use an iron core Neutral Sensor compatible with MicroVersaTrip or any
newer Trip unit (MVT RMS-9, MVT Plus, MVT PM, Power Plus, Pro-Trip, EntelliGuard) and modify the output using the
Neutral CT Adapter. This is the only practical way to approach a multi-source ground fault system. Compatible
Neutral sensors include the TSVG830BK, TSVG832BK & TSVG940BK listed above or the window type CT's available
since 2014, SSVG830W and SSVG940W. (30=3000A, 32=3200A and 40=4000A CT Rating) .
30 EntelliGuard R Circuit Breaker Retrofill AKD-5/6 Installation Manual DEH0005240 R01