Description; Application - GE RPM11A Instructions Manual

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