ABB CVE Instruction Leaflet

ABB
Effective: January 1997
Supersedes I.L. 41-681.1Q, Dated January 1988
( | ) Denotes Change Since Previous Issue
CAUTION
!
Before putting the Synchro-Verifier into ser-
vice, remove all blocking inserted for the pur-
pose of securing all parts during shipment.
Make sure that all moving parts operate
freely. Inspect the contacts to see that they
are clean and close properly. Operate the
relay to check the settings and electrical con-
nections.
1. APPLICATION
The types CVE, CVE-1, CVE-2 and CVE-3, figures 1,
2, and 3, synchro-verifier relays are used to check the
voltages on both sides of a breaker to see that they
are approximately the same in magnitude and phase.
The synchro-verifier relays are not automatic syn-
chronizers and should not be used as such. Auto-
matic synchronizers are available with permit closing
ahead of synchronism at an angle of phase-advance
proportional to the beat frequency and determined by
the speed of operation of the circuit breaker so that
the two systems are connected at synchronism.
The CVE type relays supervise the automatic or man-
ual closing of a circuit breaker. A common application
of the synchro-verifier relay is in conjunction with
automatic reclosing equipment or loop systems fed
by generating stations at two or more points. When a
line section trips out, the synchro-verifier is used at
All possible contingencies which may arise during installation, operation or maintenance, and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is
desired by purchaser regarding this particular installation, operation or maintenance of this equipment, the
local ABB Power T&D Company Inc. representative should be contacted.
Printed in U.S.A.
ABB Automation Inc.
Substation Automation and
Protection Division
Coral Springs, FL 33065
Types CVE, CVE-1, CVE-2
AND CVE-3
Synchro-Verifier Relays
one terminal to check synchronism after the remote
terminal is reclosed. If the two systems are in syn-
chronism, the synchro-verifier permits that automatic
equipment to reclose the breaker.
The CVE-1 has the CVE unit and is additionally
equipped with line and bus voltage sensing, tele-
phone type relays. These permit the relay reclosing to
be initiated when the bus is hot and the line is dead
(HBDL) or vice versa (HLDB). When both the line and
the bus are live and in synchronism, the synchro-veri-
fier relay permits the automatic reclosing equipment
to reclose the breaker.
The CVE-2 relay is comprised of three (3) telephone
type relays and two (2) over or under voltage tog-
gle-type relays in addition to the CVE unit and is used
for selective initiation of reclosures. The reclosing is
modified by the nature of the trip; high-speed relay
trips initiate high-speed and delayed-time reclosures;
time-delayed relay trips initiate only time-delayed
synchronism reclosures; and manual trips which do
not initiate reclosures.
The CVE-3 relay also has the CVE unit. A telephone
relay is added for the purpose of sealing-in the CVE
contacts once they have closed. The CVE-3 relay is
capable of being energized with the CVE unit con-
tacts closed and will carry current continuously.
2.
A. Operating Element (Rear Element) Figure 1
CONSTRUCTION
An "E" type laminated electromagnet is part of
the operating element of the synchro-verifier
Instruction Leaflet
41-681.1R