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T he CEY52B relay is a three- phase, high speed, single-zone directional mho distance relay.
designed specifically for use with the CEX20A or CEX20B reactance type relay.
relay is constructeo of three single-phase units mounted in one L2-D case with provisions for
testing.
The internal connections for the relay are shown in Figure 10, while outline and panel drilling
dimensions are shown in Figure 16.
relay is not intended for use as a firs� zone function, thus the transient overreach characteristics have
not been limited in this respect.
The CEY52B relay is a three-phase, single zone mho distance relay that is not meant to be used by
itself, but rather is designed to
relays may be used in a step-distance scheme to provide two zones of protection against phase faults, or
they may be used as part of a high-speed pilot-relaying scheme in addition to providing step-distance
protection.
Figure 4 illustrates typical external connections to the relay when it is used in a step
distance scheme with the CEX20B relay.
When applying this relay for the protection of a given circuit, select the highest basic minimum reach
tap that will accommodate the desired reach setting.
highest possible level of torque.
Since the memory action of the CEY52B will only be effective for several cycles after the inception of
a fault, the relay should not be relied on to provide time-delay protection for any fault that provides zero
voltage at the relay.
protection for this contingency is required.
T he section under CALCULATION OF SETTINGS provides a worked example for determining the settings of the
CEY52B in
typical application.
a
the section entitled TAPPED AUTO-TRANSFORMERS.
less than 25 percent.
The type CEY52 relay covered by these instructions is available for 120 volts, 5 amperes, 60 or 50
cycles rating.
The basic minimum reach and adjustment ranges of the mho units are given in Table
It will be noted that three basic minimum reach settings are listed for the mho units.
desired basic minimum reach setting for each unit is made by means of links on a terminal board located at
the back of the relay (see Fig.
as A-B determine the basic minimum setting of the mho units.
adjusted in one percent steps over a 4/l range for any of the basic minimum reach settings listed in Table
by means of autotransformer tap leads on the tap blocks at the right side of the relay.
TheM. w.tJw.c.:tion!.l
eveJuj pou.-<.b.te. eon.t,i.ngenc.y
6UI!.th e Jt V1.6oJlmtLti. o n be de1>ill d
.the. puJLc..h.al l v r.' & puJtpo&el>, .the. ma.tt eJt &hould be. Jte.6eJLJte.d .to .the. Ge.ne.. ' Lal. Ef.e.et'L-i.c Company.
To .the. e.x.te.n.t Jte.qui.lte.d .the. p.IU!duW de1>c.JUbe.d heJte..i.n me.e.t appuc.a.bf.e. ANSI, IEEE
b ut no &ueh ll6-6U!Laitee.-<.& g-i.ve.n.
MHO DISTANCE RELAY
Typical external connections to the relay are shown in F1gure
BASIC MINIMUM REACH
TAPS OF CEY52B
0.5 - 1.0 - 1.5
1.0 - 2.0 - 3.0
used with a CEX20A or CEX20B reactance type relay.
be
The protection should be supplemented by other devices to detect this condition if
Once the settings have been calculated, the taps are set as described in
2).
The position of the two sets of links, (for each unit), each identified
do
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not puJtpo-'l.t
.to
be me.t V1. eonne.c.:tion
.to
&houi.d paJ!..t,i C'.LI1.a Jt pJt.Obf.em& aJU.!:,e.
OIL
wd:h
Jtel>pe.et
.to
GEK- 45495
TYPE CEY52B
DESCRIPTION
TABLE I
SELECT CEX SHOWN BELOW
APPLICATION
This will insure that the relay will operate at the
Under no conditions, should the restraint taps ever be set
RATINGS
The ohmic reach of the mho units can be
va.!Ua.:Uo n!.l
de.taill.
Oft
wd:h
w.taLta:tWn, op�on
whlch
f.oeaf. c.odel> and 0-'LdVtance.t.
3
See Table
I.
CEX20A
CEX20B
The combination of
equipment
noJt
V7.
to
maintenance.
Oft
aJte. not c.ove.Jte.d w66- {. ucn:tl'.ij 6o'L
and
NDtA
bc.eru.�c. tltc.y va'riJ g'tcaU�r.
It was
The
CEY52B
phase
single
The
4.
II.
Selection of the
II
p.IU!v-i. de. 6 01t
Should
�-ta.ltda'r({j;
j
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