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BASIC REACH TAPS
0. 5 - 1. 0 - 1. 5
1 - 2 - 3
* Adjustment taps are set using middle tap at the factory.
**Maximum torque angle can be adjusted up to 75 degrees. T he reach of the mho units will
increase to approximately 12 0 percent of its reach at the 60 degree setting.
CONTACTS
The contacts of the CEY52 relay will close and carry momentarily 30 amperes direct current.
the circuit breaker trip circuit must be opened by an auxiliary switch contact or other suitable means since
the relay contacts have no interrupting rating.
TARGET SEAL-IN UNIT
The target seal-in unit used in the C EY52 relay has ratings as shown in T able III.
Mininum Operating
Carry C ontinuously
Carry 3 0 amps for
C arry 10 amps for
D-C R esistance +10%
60 C ycle Impedance
The mho units of the CEY52 relay are of the four pole induction cylinder construction in which torque
reproduced by the interaction between a polarizing flux and fluxes proportional to the restraining or
operating quantities.
The schematic connections of the mho unit are shown in Fig . 5. The two side poles , energized by
phase-to-phase voltage , produce the polarizing flux.
percentage of the same phase-to�phase voltage , interacts with the polarizing flux to produce restraint
torque.
The flux in the rear pole, which is energized by the two line currents associated with the same
phase-to-phase voltage , interacts with the polarizing flux to produce operating torque.
The torque at the balance point of the unit can therefore be expressed by the following equation:
BASIC MIN REACH
( 0-N OHMS ) *
0. 5
1. 0
1 . 5
1
2
3
TARGET SEAL -IN UNIT
0. 2 AMP TAP
0 . 2 amp
0. 4 amp
0.03 sec.
0.25 sec.
7.0 ohms
52 ohms
OPERATING PRINCIPLES
Torque
0
=
where:
E
phase-to-phase voltage ( E
=
I
de�ta current (I 1 - r
=
angle of maximum torque of the unit
9
=
0
power factor angle of fault impedance
=
K
design constant
=
GEK-45495
TABLE II
RANGE
( 0-N OHMS)
0.5 - 2 . 0
l. 0 - 4.0
1. 5 - 6.0
1 - 4
2 - 8
3 - 12
TABLE I II
0. 6 AMP TAP
0.6 amp
1.5 amp
0 . 5 sec.
4. 0 sec.
0.6 ohms
6 . 0 ohms
The flux in the front pole , which is energized by a
2
EI cos ( 0-9) - KE
=
)
2
4
ANG L E OF
ON E SECOND
MAX TORQUE
RATING
60 °
**
6 0 °
* *
60 °
**
60 °
**
6 0 °
* *
60 °
* *
2 . 0 AMP TAP
2. 0 amp
3 .5 amp
4 . 0 sec.
3 0.0 sec.
0.13 ohms
0.53 ohms
)
12
150
150
15 0
150
150
15 0
However,
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