GE RPM11A User manual

TYPES
RPMllA RPMllH
RPI411B RPMllJ
RPMIID RPM14A
RPMllE RPM14B
RPM14D
INSTRUCTIONS
TIMING RELAYS
GEH-2030D
Supersedes GEH-2030C
GENERAL _ ELECTRIC

GEH-2030
CONTENTS
DESCRIPTION.
3
APPLICATION.
3
OPERATING CHARACTERISTICS.
4
THREE SECOND RELAYS
4
ONE SECOND RELAYS
4
TX UNIT
4
RATINGS .••
4
CONSTRUCTION AND CIRGUITRY
5
INSTALLATION • 6
RECEIVING
6
LOCATION AND MOUNTING
6
GONNECTIONS
6
SETTINGS. 6
MAINTENANCE. . 6
PERIODIC TESTING ••
6
SERVICING • • . • 7
CONTACT CLEANING . 7
MECHANICAL ADJUSTMENTS
7
RENEWAL PARTS .•..•...••
8
2

G£H-2030
TIMING RELAYS
TYPE RPM
OESCRI PTION
The Type RPM relays are DC timing relays specifically designed for use with distance relays for trans-
mission line protection. Their function is to provide target indication and suitable time delays for first.
second and third zone trip protection in step distance relay applications. Each timina relay has three
electrically separate trip circuits. The first zone trip circuit consists of a target in series with a time
delay contact. The third zone trip circuit consists of third target in series with a second time delay con-
tact. The targets, when operated, indicate the fault location in terms of which zone of relay protection
operated to
trip the breaker. The time delay contacts of the relay delay tripping so as to provide time
coordination with other relaying applied to the system.
One Type RPM relay is required with each set of
three distance relays providing phase packaged three zone step distance transmission line protection.
These relays are mounted in a size S2 drawout case. The outline and panel drilling is shown in
figure 16.
The basic differences between the various model relays are listed in Table 1. The RPM11D and
RPM11H relays are suggested for standard applications.
TABLE 1
RELAY
INTERNAL TIMING
TYPE
CONN RANGE
figure
Seconds
RPMllA
6,
7 0.15-3.0
RPM11B
8,
9 0.15-3.0
RPMllO
6,
7 0.15-3.0
RPMllE
8,
9 0.15-3.0
RPM11H
6. 7 0.10-1.0
RPM11J 8,
9 0.10-1.0
RPM14A
10.
11 0.15-3.0
RPM14B
12. 13 0.10-1.0
RPM14D
12. 13 0.15-3.0
+Contact
dwell time depends on the time dial setting
t60-Cycle basis
APPLICATION
COIL CIRCUIT
CONTACT DWELL TIME+
TIME RATING
Second Zone
Third Zone
Seconds
Cyclest Cyclest
60
9-15
9-15
60
9-15 9-15
60
Maintained 9-15
60
Maintained 9-15
60
Maintained 3-4.5
60
Maintained 3-4.5
Continuous
9-15
Maintained
Continuous Maintained Maintained
Continuous Maintained Maintained
The Type RPM relays are DC timing relays specifically designe9 for use with distance relays for
transmission
line protection. Their function is to provide target indication and suitable ttme delays
as required for first. second and third zone trip protection in step~distance relay applications. The
standard schemes for this type of protection employ either the RPM11D or the RPM11H relay depending upon
whether a three second or a one second timer is desired. These relays have maintained second zone time
These instructions do not purport to cover all details or variations in equipment nor to provide for
every possible contingency to be met in connection with installation, operation or maintenance. Should
further information be desired or should particular problems arise which are not covered sufficiently for
the purchaser's purposes, the matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards;
but no such assurance is given with re.spect to local codes .and ordinance.s because they vary greatly.
3

GEH-203f)
delay contacts. They provide an advantage over relays with passing (non-maintained) contacts when applied
on three terminal transmission lines.
Figures 4 and 5 are typic,al external connection diagrams for the RPMllD and RPMllH relays when used
with GCX51 and GCY51 distance relays respectively. The RPM11A relay is identical to the RPM11D relay
except that
it has a passing second zone contact. Thus Figures 4 and 5 also apply to the RPMIIA relay.
The RPM14A, RPM14B and RPM14D relays have continuously rated coil circuits. Aside from this they
are functionally equivalent to the
RPM11A. RPM11H and RPM11D respectively. While the internal connections
of the
RPM14A, RPM14B and RPM11D are somewhat different from the internal connections of the RPM11A, RPM11H
and RPMIID relays. the stud arrangements are such that these relays are electrically interchangeable. It
is possible to substitute anyone for the other using the same relay case by simply removing one relay
from its case and substituting the other. However. such a procedure is suggested only if these relays are
employed in a standard application such as illustrated in Figures 4 and 5. Note that if different internal
connections are visualized for the
RPM14A. RPM14B and RPM14D relays. Figures 4 and 5 may be also used for
the external connections to these
relays.
The RPM118, RPM11E and RPM11J are similar to each other except for the differences noted in Table 1.
These three types all have the same internal connec.tions. which are somewhat different from the internal
conn~ctions of the RPM11A, RPMIID and RPMIIH relays. It is in this sense only that they are somewhat
special. They are included in this book without any application guide Because they are available and may
suit the needs of someone-~aving a special relaying problem.
None of the relays covered by these instructions contain seal-in units. The seal-in units of the
associated distance relays are
used to seal-in around the RPM contacts.
OPERATING CHARACTERISTICS
THREE SECOND RELAYS
The minimum time setting of these relays is 0.15 seconds. The minimum difference in time between the
TU2 and the TU3 contact settings is between 0.084-0.117 second. The average dwell time at 0.75 second set-
ting is 0.15 second. At the three second setting the average d\'/ell time is 0.25 second.
ONE SECOND RELAYS
The minimum time setting for these relays is six cycles (60-cycle basis). The minimum difference in
time between the TU2 and TU3 contact settings is two-four cycles. The average dwell time at the 15 cycle
setting is three cycles and at the 60-cycle setting is 4.5 cycles.
TX UNIT
The pickup time of the TX unit with rated voltage applied is approximately two cycles on a 60-cycle
basis. Pickup time is the time from the instant voltage is applied to the instant a normally closed con-
tact opens.
RATINGS
The RPI111A. RPM1l8, RPMllD, RPMllE. RPMllH and RPMllJ relays are available for intermittent (60
seconds) rating at standard DC control voltages from 24 to 250 volts. The RPMI4A, RPM148 and RPM14D
relays are continuously rated at standard DC control voltages from 24 to 250 volts.
TARGET RATINGS - AMPERES
RATING
CONT.
TRIP DUTY
RES. OHMS
0.2 0.5 5 7.360
0.6 1.5
20
0.73
1.0 2.5
30
0.346
2.0 4.0
30
0.120
4.0 8.0
30
0.020
4

GEH-2030
CONSTRUCTION AND CIRCUITRY
The operating magnet of all these relays is a curved solenoid called a rotonoid and is designated
as TU. Its armature is able to rotate through approximately 180 degrees. The rotonoid winds up a spiral
spring from which is obtained the energy to drive the main shaft. Mounted on the main shaft are the circu-
lar calibrated time dial and two insulated cams for operating the timing contacts, TU2 and TU3. Also con-
nected to the
main shaft through a set of spur gears is a magnetic damping element for regulating the speed
of operation. This element consists of a copper cylinder rotating in an annular air gap across which ex-
ists a permanent magnetic field. The relative position of the cylinder in the air gap determines the amount
of damping obtained.
The insulated cam on those relays which have a maintained second zone is such that when the second
zone contact (TU2) is closed, it remains closed until the relay completely times out. The insulated cam
on the relays which do not have a maintained second zone hold the TU2 contact closed only for the length
of time stated in Table 1.
The third zone contact (TU3) is maintained on the continuously rated relays. This is accomplished by
adding to the intermittently rated relay a telephone unit designated TV. The continuous rating of the
RPM14 is achieved when TV operates to open the rotonoid (TU) circuit yet does not affect the TX circuit.
As long as TX and TV are picked up, TU3 will be maintained.
The time dial of the three second relays is calibrated in tenths of a second, while the time dial of
the one second relays is calibrated in cycles (60 cycle basis) with graduations of 2.5 cycles.
Table 2
lists the circuit resistance for the various relays covered by these instructions.
RELAV
VOLTS
TU
250
100
>-
220
100
-'
In
~
>-
z <I:
ILl
-'
125
100
~ ILl
~
IX
...
::E C
IX
ILl
ILl
~
110
100
~
<I:
Z IX
...
48
6.5
24
6.5
250
100
220
100
In
>- >-
-'
<I:
. In
-'
:::l
ILl
125
100
0 IX
:::l
z
...
~ c
Z
ILl
110
100
0
!q;
u
IX
48
6.5
24 6.5
R1
300
250
100
75
13.5
3
300
250
100
75
13.5
3
TABLE 2
CIRCUIT RESISTANCE
Resistance
TX
R2
3700
2500
550
3000
2000
550
3700
1200
550
3000
1000
550
340
95
130
340
45
130
3700
2500
550
3700
2000
550
3700
1200
550
3700
1000
550
340
95
130
340
45
130
5
R3 +
TV
R4
1200
--
2500
1000
--
2000
None
--
None
--
45 --
95
None
--
1200
7500 7500
2500
1000
7500
7500
2000
None
7500
None
None
7500
None
45
425 425
95
None
425
None
"

GEH-2030
+ rapped Resistor [}~~~
-series section
-parallels
high resistance
section of
TX
INSTALLATION
RECEIVING
These relays when not included as a 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 Apparatus Sales Office.
Reasonable care should be exercised in unpacking the relay in order that none of the parts are
damaged 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 o~tside of
the case
may find its way inside when the cover is removed and cause trouble in the operation of the relay.
LOCATION AND MOUNTING
The location should be clean and dry, free from dust and excessive vibration, and will be lighted to
facilitate inspection and testing. The relay should be mounted on a vertical surface. The outline and
panel drilling diagram for the relays covered by this instruction book is shown in Figure 16.
CONNECTIONS
The internal wiring diagrams for the various relays covered by 'these instructions are shown in
Figures 6 to
13 inclusive. Typical external connection diagrams are shown in Figures 4 and 5.
Unless mounted on a steel panel which adequately grounds the relay case, it is recommended that the
case
be grounded through a mounting stud or screw which a conductor not less than #12 B &S gauge copper
wire or its equivalent.
It should be noted that an external means must be provided to open the rotonoid coil (TU) circuit
after any of the intermittently rated relays have operated.
SETTINGS
As shipped from the factory (unless otherwise specified) TU2 cam will be set at one second on the three
second relays and at 20 cycles on the one second relay. The TU3 contact for Doth the three and the one sec-
ond relays is set at its maximum time limit position.
In order to change the time setting of either the TU2 or the TU3 contact simply loosen the clamping
screw that holds the pOinter in position. Move the pOinter to the desired time and then tighten the
clamping screw.
MAINTENANCE
PERIODIC TESTING
It is recommended that a mechanical inspection and an operation test be performed at least annually,
and if possible at the same time associated equipment is tested.
The interval of time may vary depending on the relative importance of individual protective equipment,
their exposure to unfavorable conditions such as extreme heat, moisture or fumes. Dust and dirt may con-
taminate the relay when the protective cover t's removed.
Periodic tests consist of checking the contacts for corrosion and pitting, and the relay calibration.
6

SERVICING
CONTACT CLEANING
GEH-2030
For cleaning fine silver contacts, a flexible burnishing tool should be used. This consists of a
flexible strip of metal with an etched roughened surface, resembling in effect a superfine file. The
polishing action is so delicate that no scratches are left, yet corroded material will be rew.oved rapidly
and thoroughly. lhe flexibility of the tool insures the cleaning of the actual points of contact.
Fine
silver 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 or cloth
may leave minute particles of insulating abrasive material in the contacts, thus preventing closing.
The burnishing tool described above can be obtained at the factory.
MECHANICAL ADJUSTMENTS
The relays are adjusted at the factory and it is advisable not to disturb the adjustments. If for
any reason they have been disturbed, the following points should be observed in restoring them. Refer
~o Figures 1, 2. 3 and 14 for the location of the parts mentioned.
CAUTION: When the time scale is rotated manually it should only be turned far enough so the inner
cam clears its contact brush.
1.
The gap between the contact tips on each set of the timing unit contacts should be approximately
1/16 inch.
Each contact brush should bear against its respective scraper brush.
2.
When rotated, the insulated cams should touch the inner contact brush at the "V" only, but high enough
I on the "V" to insure 1/64 inch wipe on the outer contact brush. These cams should not extend beyond
the edge of their respective contact brush.
3. With the pointer of the rear insulated cam set at maximum time setting on the scale, this cam should
rotate far enough beyond the apex of the "V" in the contact brush to allow the contacts to reopen
when the timing unit is fully operated. .
4. There should
be at least 1/32 inch clearance between the time scale assembly and the front mounting
plate.
5. There should be no binding between the gear on the main shaft and the pinion on the magnetic damping
element shaft.
6. The pawl of the ratchet assembly on the magnetic damping element shaft should remain engaged to the
same tooth when the time scale is rotated from zero to the maximUM time setting mark and should allow
the gear to
slip when the scale is released.
7. The flexible stop arm at the rear of the main shaft should clear the supporting bracket by at least
1/32 inch.
8.
With the operating magnet in either the de-energized or the fully operated position, the driving arm
should clear the cutout section of the main shaft supporting bracket by at least'1/32 inch.
9.
The driving arm assembly should clear the rear mounting plate by at least 1/32 inch.
10. There should be at least 1/64 inch clearance between the reset spring collet and the rear bearing
of the rotonoid.
11. The time of operation for any scale setting may be varied by sliding the copper cylinder forward
or backward on its shaft or turning the driving spring collet on its shaft. Be sure to tighten
the
set screw after adjustments have been made.
12. With the rotonoid de-energized. the reset spring is prewound approximately one-half revolution and
the driving spring is prewound approximately three-fourths of a turn.
13. The gap of all TX and TV unit contacts should be at least 1/64 inch.
14.
The wipe of all TX and TV unit contacts should be approximately 0.006 inch.
7

GEH-2030
15. The end of the residual screw of the TX unit should be flush with the inside face of the armature.
To check the time calibration connect the Type RPM relay as shown in Figure 15. In testing the Type
RPM relays with a passing second zone contact the clock will be stopped only momentarily and the reading
must be made at that instant since the timing unit contacts are closed only 0.15 seconds. A fast operating
self-scaling auxiliary relay energized
through the timing unit contacts may be used to stop the clock.
Set the pointers of the front and rear insulated cams so that the notched edge coincides with the
desired calibration
marks on the scale. Check the time by closing 51. then read the time when the clock
stops
momentarily. Note that 51 should be opened a.s soon as the intermittently relays have timed out.
If necessary. the time calibration may be corrected by sliding the copper cylinder forward or backward
on the magnetic damping element shaft or by turning the driving spring collet on its shaft.
Moving the copper cylinder forward decreases the time delay and moving it backward increases the time
delay. Never move the copper cylinder backward enough to strike the bottom plate of damping magnet element.
Turning the driving spring collet in a counter clockwise direction (front view) decreases the time
delay and in a clockwise direction increases the time delay.
RENEWAL PARTS
It is recommended that sufficient quantities of renewal parts be carried in stock to enable 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. speci-
fying the quantity required and describing the parts by catalog numbers as shown in Renewal Parts Bulletin
No. GEF-3835.
8

Til
TIM
DIAL~---
GEH-2030
TX UNIT
INSULATED
CAMS
FIG. 1 (8027902) TYPE RPM RELAY REMOVED FROM CASE (FRONT VIEW)
R2
ROTONOID
Rnm, .. nm(TU) ItfStSTOR __ ~
RI
fIG. 2 (8007803) TYPE RPM11 RELAY REMOVED FROM FIG. 3 (8020357) TYPE RPM14 RELAY REMOVED FROM
CASE (REAR VIEW) CASE (REAR VIEW)
9

PHASE SEQUENCE
1-2-3 OR 3-2-1
DEVICE DEVICE
NO. TYPE
21 GCX51A&8
21X Rf'lA110 & llH
GEH·2030
LEGEND
~~~~. DESCRIPTION
TR
M
o
ox
T&SI
REACTANCE TYPE STEP 01 ,'ANCt ~tLA'
TRANSAC !lR
MH UN
REACTANC UN
ONE fRANSFER AUX I :I AR' ·U" u
TARGET AND SEA IN
1M NG RELA
T1 T2 T ZONE ZONE NE ,.
TU T 1M I NG ELEMENTS
~_-II- ___ --+-:!T=",U-~2;-+...!F~IR:;;S~T::-,TIMING CONTACT TO CLOSE
~_-II- ___ --+--l~U-;;2-3-l-'S~!EC~0~N~CONTACT TO CLOSE
IX AWOL! TIMING ELEMENTS
52 C R U .
AUXILIAR SWI H
.
TC
TRIP COIL
94 IHGA14AIA OR AL
AUXILIARY TRIPPING RELAY
TAIlU.LATI ON OF O£V ICES
DEVICE TYPE
INT. CONNS.
OUTLINE
;CX51A&B
I0165A, 06
-6209276
110&H
n17RA7092
iG,114AM
{BACK WNI
NSJ
K-6400533' ·-64005"
114A[
IFRON'
,"741,<
77A139
REC
IFIER
'Bf,=,
1l5V
TRI P RFrr E1FR
250V
FIG. 4A
2~----~4-----------~---+-
31-.~~+-----~--~--~-
OVERCURRENT UNIT IN
GCX518 ONLY
6 7
10
10
10
21-3-1
M 0-
TR
9 8
21-1-2
M 0-
TR
S·
21-2-3
M
'0
T~
,
9
60 CYCLE
FIG. 4B
- __ 02
R-X DIAGRAM
FIG. 4 (7381B93-5) TYPICAL EXTERNAL CONNECTION FOR
10