Table of Contents
Advertisement
Ground Directional
Stationary Contact Assembly
B Contact
C Contact Tip
Brush
RECEIVING, HANDLING AND STORAGE
These relays, when not included as a part of a
control panel will be shipped in cartons designed to
protect them against damage. Immediately
of a relay, examine it for any damage sustained
in transit. If injury or damage resultingfrom rough
handling is evident, file a damage claim at once with
the transportation company and promptly notify the
nearest General Electric Apparatus Sales Office.
Reasonable care should be exercised in
T I M E
The inverse time
tapped current operating coil wound on a U-magnet
iron structure.
The tapped operating coil is con-
nected to taps on the tap block. The U-magnet con-
tains wound shading coils which are connected in
series with the directional unit contacts.
power flow is in such a direction
directional unit contacts, the shading coils act to
produce a split-phase field which, in turn, develops
torque on the operating disk.
The very inverse and extremely inverse time
units are of the
to that
in
used
the upper portion of the iron structure has two con-
centric windings on the middle leg of the magnetic
circuit.
One of these is a tapped current winding
connected to taps on the tap block, the other is a
floating winding which is connected in series with
the directional unit contacts, a resistor, and the two
Courtesy of NationalSwitchgear.com
J
Support
L Mounting Screw
Fig. II
Gradient Contact Assembly For The Directional Unit
DESCRIPTION
unit consists of a
When
to close the
type similar
meters except as follows:
Relay Type
D Contact An
packing the relay in order that none of the parts are
injured or the adjustments disturbed.
If the relays are not to
should
in a place that is free from moisture, dust and
metallic chips.
outside of the case may find its way inside when
the cover is removed and cause trouble in the
of the relay.
coils on the lower legs of the magnetic
When power flow is in such a direction as to close
the directional unit contacts, the unit develops torque
on the operating disk.
The disk shaft carries the moving contact which
completes the trip circuit when it touches the sta-
tionary contact or contacts. The
by a spiral spring to give the proper contact-closing
current, and its motion is retarded by a permanent
magnet acting on the disk to produce the desired
time characteristic.
resulting from the gradient of the
compensated by the spiral shape of the induction
which results in an increased driving force as
disk,
the spring winds up.
The directional unit is of the induction-cylinder
construction with a
poles projecting inward and arranged symmetrically
Moving Contact Assembly
F Contact
installed
be
in their original cartons
be stored
Foreign matter collected on the
is restrained
The variable retarding force
having eight
spring is
Advertisement
Table of Contents
