Contacts; Target Seal-In Unit - GE CEY51A Instructions Manual

GEK-I27S
TABLE II
MHO MINIMUM
UNIT REACH RANGE
ANGLE
~1-2
0.2/0.4/0.8 0.2 to 8 60**
or 0.375/0.75/1.5 0.375 to 15 60**
~2-3 0.75/1.5/3.0 0.75 to 30 60**
or or or
9)3-1 1.5/3.0/6.0
1.5 to 60 60**
Adjustment taps are set for 1.5 ohms (or 0.4 ohms)
** The angle of maximum torque can be adjusted up to 750.
The reach of the mho units at the 750 setting will
increase to approximately 103% of its reach at the 600 setting.
It
will be noted that three basic-minimum-reach settings are listed for the mho
units. Selection of the desired basic-minimum-reach setting for each unit fs made
by means of two tap screws on a two-section tap block located at the back of the
relay (see Figure 1). The position of these screws determines the tap setting of
the two primary windings of the transactors
(TR-~1-2, TR-~2-3, TR-~3-1).
The ohmic
reach of the mho units can be adjusted in 1% steps over a 10/1 range for any of the
basic-minimum-reach settings listed in Table II by means of autotransformer tap
leads on the tap blocks at the right side of the relay.
CONTACTS
The contacts of the CEY51A relay will close and momentarily carry 30 amperes
DC. However, the circuit-breaker trip circuit must be opened by an auxiliary switch
contact or other suitable means, since the relay contacts have no interrupting
ra ti ng.
TARGET SEAL-IN UNIT
The target seal-in unit used in the CEY51A relay has ratings as shown in
Table III.
TABLE I II
0.2/2.0 Amp 0.6/2.0 Amp
0.2 2.0 0.6 2.0
Carry 30 Amps for (seconds)
0.05
2.2 0.5 3.5
Carry 10 Amps for (seconds) 0.45 2.0 5.0 30.0
Carry Continuously (Amp) 0.37 2.3 1.2 2.6
Minimum Operating (Amp) 0.2
2.0
0.6
2.0
Minimum Dropout (Amp) 0.05 0.5 0.15 0.5
DC resistance (Ohms)
8.3
0.24 0.78 0.18
60 Hz Impedance (Ohms) 50 0.65 6.2 0.65
50 Hz impedance (Ohms)
42 0.54 5.1 0.54
DC Resistive Interrupting 2.5 Amp
Rat i ng (Amp5J
@
125 VDC
7