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that used in watthour meters except as follows:
structure has two concentric windings on the middle leg of the magnetic circuit.
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, a capacitor and the two coils on the lower legs of the magnetic circuit.
power flow is in such a direction as to close a directional unit contact, the unit
develops torque on the operating disk.
The disk shaft carries the moving contact which completes the trip circuit when it
touches the stationary contact or contacts.
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.
retarding force resulting from the gradient of the spiral spring is compensated by the
spiral shape of the induction disk, which results in an increased driving force as the
spring winds up.
TARGET SEAL-IN UNIT
A seal-in unit is mounted on the left side of the time overcurrent unit. This unit
has its coil in series and its contacts in parallel with the main contacts of the
overcurrent unit, arranged in such a manner that when the main contacts close, the
seal-in unit picks up and seals-in around the main contacts.
operates,
it raises a target into view which latches up and remains exposed until
manually released by pressing the button located at the lower left corner of the cover.
INSTANTANEOUS UNIT
The IOC unit is a small hinged armature type instantaneous element and is mounted on
the right side of the TOC unit. The IDC element operates over a 25-to-one total range
obtained by using a tapped coil which provides a five-to-one low range and a five-to-
one high range; this combination provides the 25-to-one total range. When the current
reaches a predetermined value, the instantaneous element operates closing its
circuit and raising its target into view. The target latches in the exposed position
until it is released.
releases the target of the instantaneous unit.
These relays, when not included as part of a control panel will be shipped in
cartons designed to protect them against damage.
examine it for any damage sustained in transit.
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 unpacking the relay in order that none of
the parts are injured or the adjustments disturbed.
If the relays are not to be installed imnediately, they should be stored in their
original cartons in a place that is free from moisture, dust and metallic chips.
Foreign matter collected on.the outside of the case may find its way inside when the
cover is removed, and cause trouble in the operation of the relay.
GEK-49822
The same button that releases the target seal-in unit
RECEIVING.
HANDLING
12
the upper portion of the lron
The shaft is restrained by a spiral spring
AND
STORAGE
Immediately upon receipt of a relay,
If injury or damage resulting from
When
The variable
When the seal-in unit
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