TYPE HQS RELAY
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Fig. !-Internal Schematic of the Type HQS in the Type FT
Case.
contacts.
This shunts
the
main
relay
con
tacts,
thereby
relieving them of the duty of
carrying
tripping
current.
These
contacts
remain
closed
until
the
trip
circuit
is
opened by the auxiliary switch on the breaker.
Three of
these contactor switches are used,
one
in
each
of the three trip
circuits to
seal in the trip circuit.
Operation Indicator
The operation
indicator is a small solenoid
coil
connected in the trip circuit.
When the
coil
is
energized, a spring-restrained arma
ture releases the white target which falls by
gravity
to
indicate
completion of the
trip
circuit. The
indicator is reset from outside
of
the
case
by
a
push
rod in the
or cover stud.
Three Phase Negative Sequence Filter
cover
The filter consists of three mutual reactors
each
with
three
windings connected as shown
in Figure 2·. With unbalanced three-phase cur-
2
rents flowing in the input terminals, the out
put
voltage and current
will be proportional
to the negative sequence components of the un
balanced
input.
The detailed explanation
of
the filter is beyond the scope of this leaflet
and is covered
in
catalog
section 41-287 on
the type CRS relay.
CHARACTERISnCS
The
type
HQS
relay
js an auxiliary relay
used
in
the carrier relaying scheme with the
types
HZ ,
HRK-P and RSN relays. There are
no
settings required.
The
minimum pick-up
of the type
HQS Relay
and the filter is as follows:
Polarizing
Winding
Turns
Amperes
17
1.0
10
1.3
7
1.55
3
2.37
Maximum
3Io
Amperes
15.0
25.0
32.0
75-0
Connection
of Links
1 to B, 2 to 3
4 to
A
1 to B, 2 to
A
3 to B, 4 to
A
2 to
A,
1 to 3
4
to B
This is the total
phase current passed thru
the filter ana relay to neutral with the other
two phase currer.ts zero.
The
corresponsing
negative and zero sequence values are each one
third of the values given above.
The
negative sequence coils of the type HQS
relay
are
normally connected
in
star
to
terminals
A
1,
B
1,
and C
1
of
the
sequence
filter.
The
neutral
of
negative
this star
should not be grounded.
The· terminals
A",
B",
and C" should
be
connected
together
to the
neutral of the
main current transformers.
It
is important
that
no
other elements be con
nected
between
A",
B" and C"
and
the star
a
neutral point.
The alternate connection is used where other
equipment must be connected between
A 11,
B" and
C" and
the
neutral point.
In this case
the
negative sequence coils
are connected between
terminals
A1A",
B 1B11 and C1C11•
With this c·on-
nection
zero
sequence current must
be
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