ABB Automation Inc.
Substation Automation and Protection Division
Coral Springs, FL 33065
Instruction Leaflet
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.
Type CV Voltage Relay
Class 1E Applications
Effective: November 1999
Supersedes I.L. 41-201.4G, dated January 1997
( ) Denotes changes since previous issue
CONTENTS
This instruction leaflet applies to the follow-
ing types of relays:
• CV-1 Long Time Undervoltage Relay
• CV-2 Short Time Undervoltage Relay
• CV-4 Long Time Overvoltage Relay
• CV-5 Short Time Overvoltage Relay
• CV-6 Long Time Over or Undervoltage Relay
• CV-7 Short Time Over or Undervoltage Relay
• CV-8 Low Voltage Pickup Overvoltage Relay
!
CAUTION
Before putting relays into service, remove all
blocking which may have been inserted for the
purpose of securing the parts during ship-
ment, make sure that all moving parts operate
freely, inspect the contacts to see that they
are clean and close properly, and operate the
relay to check the settings and electrical con-
nections.
1.0 APPLICATIONS
These relays have been specially designed and
tested to establish their suitability for Class 1E appli-
cations in accordance with the ABB Power T&D Com-
pany program for Class 1E Qualification Testing as
detailed in bulletin STR-1.
“Class 1E” is the safety classification of the electric
equipment and systems in nuclear power generating
stations that are essential to emergency shutdown of
the reactor, containment isolation, cooling of the reac-
tor, and heat removal from the containment and reac-
tor, or otherwise are essential in preventing significant
release of radioactive material to the environment.
The type CV relays are single-phase induction-disc
type relays operating either on under or over voltage
or both. These relays are applied as a voltage fault
detector operating in conjunction with other protective
relays. The relays are also used as timing devices for
various automatic operations.
2.0 CONSTRUCTION and OPERATION
The types CV-1, CV-2, CV-4, CV-5, CV-6 and CV-7
relays consist of a voltage unit, an auxiliary telephone
type relay and an indicating contactor switch (ICS).
The principal component parts of the relay and their
location are shown in Figure 1 (page 2).
The type CV-8 relay in addition to the above compo-
nents also has a capacitor which is series tuned with
the main coil of the electromagnet. This tuned circuit
41-201.4H
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