GE IJS52D User manual

SYNCHRONISM CHECK RELAY
TYPE IJS52D
GEI-90802E
INSTRUCTIONS
. nd Control
GE Protection a Parkway
205
Great va/~~55_1337
Malvern, PA

GEI-90802
CONTENTS
PAGE
INTRODUCTION •••••••••••••••••••••••••••••••••••••••••••• 3
APPLICATION..... •••••••••••••••••••••••••• ••••••••••••••• 3
RATI NGS. . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CHARACTER I ST I CS. •. . . . •. . . . •. . .. . •. . ••••••••••• . •. . ••. . •. . . 4
Operating Principles 4
BURDENS.. • . . .• • • . • • . ...... • • • •• • • • . • • • •• • . • . •• • . • • • • . •• . . . 5
CONSTRUCTION.. • •• • •• •• •• • ••• •• •• •• ••• • •••• •••• ••••• •• • ••• 6
RECEIVING. HANDLING AND STORAGE.......................... 6
ACCEPTANCE TESTS......................................... 6
Vis ua1 Ins pee t ion 6
Mechani cal Inspec tion 7
El ec tri cal Tests 7
INSTALLATION PROCEDURE ••••••••••••••••••.••••••••••••••• 7
Electrical Tests 8
PERIODIC CHECKS AND ROUTINE MAINTENANCE.................. 8
Contact Cleaning 8
Mechanical 9
Electrical 9
SERVICING...... ••••. •••.••••••• •••••••• ••••• ••• ••• ••••••• 9
Mechanical Adjustments 9
Electrical Adjustments 9
RENEWAL PARTS............................................ 10
LIST OF FIGURES 11
Cover Photo (8038824)
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GEI-90802
SYNCHRONISM-CHECK RELAY
TYPE IJS52D
INTRODUCTION
The Type IJS52D relays are of the induction-disk construction, and are intended for
use as synchronism-check relays.
The synchronism-check unit has two shaded-pole U-magnet driving elements acting on
opposite sides of a single rotating disk (see Figure 2). One of these, the
operating element, drives the disk in the contact-closing direction, and the other,
the restraining element, drives the disk in the opposite direction. The disk shaft
is restrained by a spiral spring, the purpose being to hold the contacts open when
the relay is de-energized. The motion of the disk is retarded by permanent magnets
(drag magnets) acting on the disk to give a time delay.
The Type IJS52D relay has two telephone-type undervoltage units.
designated as 118
11
and IIlll on Figure 7.
These are
The Type IJS52D relay does not have a seal-in unit, since one is not required in its
normal application.
APPLICATION
The IJS relay is applicable as a synchronism-check relay to permit closure of a
circuit breaker only when the two sources connected to it are correctly synchronized
elsewhere. It determines that synchronism is being maintained by other
incterconnections, and then permits closure of the circuit breaker. See Figure 9
for a typical elementary diagram.
In such an application, the voltages may be slightly out of phase with each other
because of different line and load characteristics. This condition may exist, for
example, where one line is supplying a lagging load through a transformer bank, and
the second is unloaded. The rel ay, however, can be cali bra ted to permi t closure of
the breaker under these conditions if the voltage and the phase-angle differences
are not excessive.
However, the IJS relay cannot discriminate between a very low slip frequency between
systems, and systems in synchronism. Figures 13 and 14 illustrate that the slip
frequency with which the IJS will permit closing increases with increasing closing-
angle settings, and decreases with increasing time-dial settings. In general, the
closing-angle setting is fixed by the maximum angular separation of the systems for
which the IJS must operate, and the slip frequency for which the IJS will operate is
reduced to an acceptable maximum by increasing the time-dial setting.
These ~nstructions do not purport to cover ~ll details or variations in equipment nor to provid. for
every possible contingency to be met in connection with installation, operation or .. intenance. Should
further information be desired or should particular problems arise which are not covered sutflcientlg for
the pt,;Ichaser f 5 purposes, the 1M tter shoul d be referred to the General Electric Company_
To the extent required the products described herein meet applicable ANSI, IEEE and N£~ standards,
bu t no such assurance is gl ven wi th respect to local codes and ordinances because they vary greatly.

6EI-90802
On systems where lines mayor may not be tied together elsewhere, the IJS relay is
used in para" el with the Type GES relay to permit closure of a breaker with zero
frequency difference.
Depending on the external connections used (see Figure 9), the telephone relays "B"
and "L", mentioned above, serve to reclose the breaker under conditions of (1) dead
bus or line, (2) live bus, dead line, (3) dead bus, live line, (4) dead bus, live
line, or live bus, dead line (5) dead line, bus live or dead (6) dead bus, line live
or dead.
RATINGS
The operating and restraining coils of the synchronism-check unit are continuously
rated. The contact of this unit will make and carry momentarily 30 amperes, but it
has no interrupting rating.
The telephone-type voltage relay contacts will make and carry 30 amperes momentarily
for normaly duty, but the circuit must be opened by a breaker auxiliary unit or
other suitable means.
The telephone-type relays have operation coils rated at either 67 or 115 volts.
CHARACTERISTICS
OPERATING PRINCIPLES
The operating coils, mounted on the left-hand side, produce a torque tending to
close the synchronism-check contact. This torque is proportional to the vector sum
of the vol tages whose phase positions are being compared. The torque produced by
the restraint coils is proportional to the vector difference of the voltages. The
operating torque is maximum when they are in phase; the reverse is true of the
restraining torque.
The closing angle of the relay is defined as the maximum phase displacement of the
two voltages at which the relay will close its synchronism-check contact when the
voltages are at rated value. The 200 closing angle is considered standard; however,
other settings may be made, as indicated by the voltage-phase angle characteristics
sh0 wn i n Fig u re 1.
The time-delay characteristics of the Type IJS relay are obtained primarily by the
time-dial setting. The time dial controls the distance the contacts must travel
before closure, and hence controls the time delay. At No. 10 time-dial setting, the
travel is maximum, whereas at No. 0 the contacts are just closed. A certain amount
of adjustment may be made by changing the position of the drag magnet on its shelf.
Moving it toward the disk shaft decreases the time delay, while moving it away from
the disk shaft increases the time delay.
Typical time vs. phase-angle curves are shown in Figures 4 and 5 for 60 cycle
relays. The Model 12IJS52Dl relay has a standard closing angle setting of 200, and
has its drag magnet adjusted to provide 20 seconds time delay from the No. 10 time-
dial setting for voltages in phase. The closing angle on this relay can be adjusted
to angles greater than 200, but with a corresponding decrease in time delay, as
4

GEI-90802
shown in Figure 4. The approximate reset time with both coils de-energized is about
40 seconds. The approximate reset time with one coil energized at rated voltage
varies from 3 seconds on the 20
0
setting to 6 seconds on the 60
0
setting with the
No. 10 time-dial setting.
The Model 12IJS52D3 relay, which is designed for use where a closing angle greater
than 200 is required, provides 20 seconds delay at the 400 closing-angle setting, as
shown in Figure 5. It may be adjusted to other closing angles between 200 and 600
with corresponding changes in time delay, as shown in Figure 5. The approximate
reset time with both coils de-energized is about 130 seconds at the No. 10 time-dial
setting. The approximate reset time with one coil energized at rated voltage varies
from 13 seconds on the 20
0
setting to 20 seconds on the 60
0
setting at the No. 10
time-dial setting.
Figure 6 gives the operating time in seconds for various time-dial settings with
zero phase displacement
and with rated voltage at 60 cycles on both circuits.
Curves for 50 cycles are similar. The telephone-type undervoltage units are
calibrated to pick up at 50% or less of rated voltage and to drop out at 15% or more
of rated voltage.
BURDENS
The burdens for the synchronism-check unit are given in Table I. The burden varies
with the phase displacement of the two voltages, with a minimum at 00 to a maximum
at 180
0•
TABLE I
Vo 1 ts Cycle s
Ci rcuit
Phase
Di fference
Watts Volt Amps Power
Factor
5-6 00 1.00 3.86 0.258
5- 6
180
0 1.25 4.00 0.312
67* 60
7-8 00 1.10 3.63 0.300
7-8
180
0 1.36 3.77 0.360
5- 6
0°
1.45 4.73 0.306
5- 6
180
0
1. 75 4.87 0.359
67* 50
7-8 00 1.58 4.45 0.357
7-8
180
0 1.87 4.63 0.403
5-6 00 3.00 11.6 0.258
5- 6
180
0 3.76 12.0 0.313
l15
60
7-8 00
3.30
10.9 0.300
7-8
180
0 4.07 11.3 0.360
5- 6
0°
4.35 14.2 0.306
5-6
180
0 5.25 14.6 0.359
ll5 50
7-8 00 4.75 13.3 0.357
7-8
180
0
5.60 13.9 0.403
* The burden of telephone-relay units is 10 volt-amperes and 6 watts for each unit
rated at 67 volts, 60 cycles, and 13 volt-amperes and 8 watts for each unit rated at
115 volts, 60 cycles.
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GEI-90802
CONSTRUCTION
The relay components are mounted in a cradle assembly that is latched into a drawout
case
when the relay is in operation, but they can be easily removed when desired.
To do this, the relay is first disconnected by removing the connection plug that
completes the electrical connections between the case blocks and the cradle block.
To test the relay in its case, this connection block can be replaced by a test plug.
The cover, which is attached to the front of the relay case, contains an interlock
arm that prevents the cover from being replaced until the connection plugs have been
inse
rted .
Every
circuit in the drawout case has an auxiliary brush, as shown in Figure 12, to
provide adequate
overlap when the connecting plug is withdrawn or inserted.
The relay case is suitable for either semi-flush or surface mounting, on all panels
up to 2 inches thick, and appropriate hardware is available. However, panel
thickness must be indicated on the relay order to insure that proper hardware will
be included. For outline and drilling dimensions, see Figure 15.
Internal connections for the IJS52D are shown in Figure 7. Note that the
connections to terminal 10 are arranged so that the normally-closed contact of liB"
or "L" can be used separately, as sho\tm in the typcial external connections in
Fi gu re 9.
RECEIVING, HANDLING AND STORAGE
These relays, when not included as part of a control panel, will be shipped in
cartons designed to protect them against damage. Immediately upon receipt of a
relay, examine it for any damage sustained in transit. If injury or damage
resulting from rough handling is evident, file a damage claim at once with the
transportation company and promptly notify the nearest General Electric Sales
Offi ce.
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 immediately, 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.
ACCEPTANCE TESTS
Immediately upon receipt of the relay, an inspection and acceptance test should be
made to make sure that no damage has been sustained in shipment and that the relay
calibrations have not been disturbed. If the examination or tests indicate that
readjustment is necessary, refer to the section on SERVICING.
VISUAL INSPECTION
Check the nameplate stamping to make sure that the Model Number and rating of the
relay agree with the requeisition.
6

GEI-90802
Remove the relay from its case and check that there are no broken or cracked molded
parts or other signs of physical damage. and that all screws are tight.
Check that the short fingers are in the correct location. as indicated in Figure 7.
and that the auxiliary brushes are properly adjusted (see Figure 12).
MECHANICAL INSPECTION
1. Check that the rotating element moves without noticeable friction.
2. Remove the time-dial locking screws and check that the moving contact just
touches the stationary contact when the time dial is set at zero (0). The
contact wipe should be approximately 1/32". Put locking screws back in place.
3.
Check that the control spring is not deformed and that the spring convolutions
at the No. 5 time-dial setting are reasonably concentric.
4.
Check that the armatures of the telephone relays move freely. Also. with the
telephone relays in the de-energized
position, all circuit-closing contacts
should
have a gap of 0.015" and all circuit-opening contacts should have a wipe
of 0.005". Gap may be checked by inserting a feeler gage, and wipe can be
checked by observing the amount of deflection on the stationary contact before
parting the contacts.
The armature should then be operated by hand and the gap
and wipe again checked as described above.
ELECTRICAL TESTS
Connect the relay as shown in Figure 10 and check the following:
1.
Check that the relay picks up with approximately the time delay shown in Figure
6
when a single-phase source of at least rated voltage is connected to both
operati
ng coil s.
2. Check that the relay picks up at a 200 cloSing angle (or other closing angle if
used) within ~ 30 when connected to a source with rated voltages on both coils.
Check zero-displacement pickup. which should agree with the value in Figure 1
within
~ 10%.
3. With both coils connected to a rated voltage source with zero displacement,
check
that pickup time agrees with the values given in Figures 4 or 5 ~ 10%.
4. With an adjustable 115 volt source of rated frequency, check that the
telephone-type
units pick up at 50% or less of rated voltage and drop out at
15% or more of rated voltage. To check the "L" relay, connect the voltage
source
to studs 5 and 6. To check "B" relay, connect voltage to studs 8 and 9.
INSTALLATION PROCEDURE
If. after acceptance tests. the relay is held in storage before shipment to the job
site. it is recommended that the visual and manual inspections described in the
section
on ACCEPTANCE TESTS be repeated before installation.
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GEI-90802
ELECTRICAL TESTS
Before the following electrical tests are made, the relay should be in its case,
preferably mounted in its permanent location.
The relay closing angle should be set as required for its permanent location, which
would normally be 200• Connect the relay as shown in Figure 10, and check that the
relay picks up at the proper phase angle ~ 30.
If a phase angle meter or a phase shifter is not available, it is possible to adjust
the relay to approximately the closing angle desired by means of the connections and
curve shown in Figure 11. In this test, rated voltage is held on one circuit (studs
7-8) and a reduced voltage is applied to the other circuit (studs 5-6). The voltage
connected to studs 5-6 is adjusted until the synchronizing-check unit just closes
its contact. The di fference between the two vol tages should agree approximately
with the voltage given on the curve shown in Figure 11 for the phase angle used
(e.g. 24 volts for 200 closing).
When using the connections shown in either Figure 10 or Figure 11, check the
operating time at 0 displacement with rated voltage on each coil, using the time-
dial setting of the permanent location. See Figure 6 for nominal time-delay values.
Pickup and dropout of the telephone-type undervoltage relays should be checked as
described in the section on ACCEPTANCE TESTS.
PERIODIC CHECKS AND ROUTINE MAINTENANCE
In view of the vital role of protective relays in the operation of a power
system, it is important that a periodic test program be followed. The interval
between periodic checks will vary depending upon environment, type of relay and the
user's experience with periodic testing. Until the user has accumulated enough
experience to select the test interval best suited to his individual requirements,
it is suggested that the following points be checked once a year.
CONTACT CLEANING
A flexible burnishing tool should be used for cleaning relay contacts. This is
a flexible strip of metal with an etched-roughened surface, which in effect
resembles a superfine file. The polishing action of this file is so delicate that
no scratches are left on the contacts, yet it cleans off any corrosion thoroughly
and rapidly. The flexibility of the tool insures the cleaning of the actual points
of contact.
Relay contacts should not be cleaned with knives, files, or abrasive paper or
cloth. Knives or files may leave scratches, which increase arcing and deterioration
of the contacts. Abrasive paper Ot' cloth may leave minute particles of insulating
abrasive material in the contacts, and thus prevent closing.
The burnishing tool described above can be obtained from the factory.
8

GEI-90802
t·1ECHANI CAL
The mechanical checks described in the section on ACCEPTANCE TESTS should be
repea
ted.
ELECTRICAL
Using the connections in Figure 8:
1. Check that the maximum closing angle for pickup of the synchronizing-check unit
agrees approximately with the value shown on the curve in Figure 11.
2. Check the closing time with the potentiometer set to provide rated voltage on
both circuits. The time should agree with the values given in Figure 6, ~ 10%.
Check the pickup and dropout of the telephone-type undervoltage units (278 and 27L).
SERVICING
If recalibration of the relay is necessary, the following should be considered when
making adjustments.
MECHANICAL ADJUSTMENTS
1. The moving contact should just touch the secondary contact when the time dial
is set at the zero (0) position. If readjustment is necessary, loosen the two
clamping screws which fasten the stop arm to the shaft and change the position
of the stop arm relative to the moving contact until the contacts just touch
with the time dial set at O. A fine adjustment can be obtained by moving the
stationary contact brush in or out by means of its adjusting screw. However,
in
the final adjustment, the contact brush must be positioned so that there is
1/64" to 1/32" wipe with the contact fully closed. Be sure that the screws are
securely tightened after the adjustment is made.
2. The stop-arm leaf spring should deflect at least 1/64" when the synchronism-
check unit is de-energized.
3. The disk and shaft assembly should have a vertical end play of 1/16" to 1/32"
and both bearing screws should be tight. The disk should be approximately
centered between the poles of the U-magnet and drag magnet.
4. Telephone-type relay contact gaps may be adjusted by bending the stationary
contact brush to obtain 0.015 inch gap. When the adjustment is made, the wipe
must
be rechecked to make sure there is a minimum of 0.005" wipe.
ELECTRICAL ADJUSTMENTS
Closing Angle Adjustment
Connect the relay as shown in Figure 10. To make an accurage adjustment of the
closing angle, a phase shifter and phase angle meter are required, along with a
means
for voltage control.
9

GEI-90802
Two adjustments are necessary for obtaining a desired closing angle.
adjustable
resistor at the top of the frame permits equalizing the
That
is. the closing angle will be the same. whether one voltage
lagging the other voltage.
The right-hand
closi ng angle.
is leading or
The left-hand adjusting resistor is for obtaining the correct closing-angle setting.
Simultaneous adjustments of the two resistors are necessary.
Using the connections shown in Figure 10, set VI at rated voltage. If a 200 closing
angle
is desired, set V2 at rated voltage, leading VI by 200. Adjust the left-hand
resistor until the contacts just close. Now, with rated voltage on both circuits,
determine the angle at which the contact closes with V2 lagging VI. If the two
angles are unequal, equalize them at 200 by adjusting the right-hand resistor. Then
check the closing angle with V2 leading VI, and readjust if necessary. Continue
this procedure until the relay contacts just close for VI leading or lagging V2 by
200. Use the same procedure for other closing-angle settings.
Pickup and Dropout
The pickup and dropout of the telephone-type relay may be changed by adjusting the
gap between the armature and the pole face by bending the contact operating arm
stop. After this adjustment is made, the contact wipe and gap must be rechecked.
Operati n9 Time
If it is necessary to adjust the time characteristics, impose the chosen conditions
on the relay, using connections shown in Figure 10, and adjust the time dial and, if
necessary, the drag magnet until the correct operating time is obtained.
RENEWAL PARTS
Sufficient quantities of renewal parts should be kept in stock for the prompt
replacement of any that are worn, broken or damaged.
When ordering renewal parts, address the nearest Sales Office of the General
Electric Company. Specify the name of the part wanted, quantity required. and
complete nameplate data, including the serial number, of the relay. If possible,
give the General
Electric requisition number on which the relay was furnished.
Since the
last edition. changes have been made in the final step of ELECTRICAL
TESTS, ON PAGE 7.
10