General Description; Introduction; Scope - Siemens SDV-4A Instruction Manual

General Description

Figure 1. Typical Power Circuit Breaker, Type SDV-4A.

Introduction

The successful performance and application of Power Cir-
cuit Breakers depends as much on proper installation,
maintenance and correct application as it does on good
design and careful manufacture .
Siemens Type SDV outdoor power circuit breakers are pre-
cision built units designed to function efficiently under
normal operating conditions. They are designed and manu-
factured to operate within the limits established in the ANSI
C37 and NEMA standards for Power Circuit Breakers. Per-
formance requirements of these standards have been met
or exceeded by these designs. Specific Standards which
apply include:
C37.04 AC High-Voltage Circuit Breakers - Basis of Rating
C37.06 AC High-Voltage Circuit Breakers - Preferred Ratings
C37.09 AC High-Voltage Circuit Breakers - Test Code
SG 4 Alternating-Current High-Voltage Circuit Breakers
The instructions included in this manual are provided to
aid you in obtaining longer and more economical service
from your Siemens Circuit Breakers. For proper installa-
tion and operation, this information should be distributed
to your operators, engineers and maintenance personnel.
By carefully following these instructions, difficulties should
be avoided. However, the instructions are not intended to
cover all details of variations that may be encountered in
connection with the installation, operation and maintenance
of this equipment.
Should additional information be desired, including replace-
ment instruction books, contact your Siemens representa-
tive.

Scope

These instructions cover the installation, operation and
maintenance of Siemens type SDV power circuit breakers
using vacuum interrupters. The equipment described in
this manual consists of free standing outdoor power cir-
cuit breakers for application up to 27.6kV. A typical breaker
is shown in Figure 1. All diagrams, descriptions and in-
structions apply to all above types and designs unless noted
otherwise.
Standard construction details of the circuit breaker are given
in the appropriate sections. Special mechanical and elec-
trical devices, furnished in accordance with purchase or-
der requirements, are covered by supplementary instruc-
tions submitted with this instruction manual.
The equipment furnished has been designed to operate in
a system having the circuit capacity specified by the pur-
chaser. If for any reason the equipment is used in a differ-
ent system, or if the short-circuit capacity of the system is
2075-98
increased, the momentary rating and interrupting capacity
of the circuit breaker must be checked. Failure on the part
of the user to receive approval of intended changes from
Siemens may cause voiding the warranty.
General Description
The power circuit breaker described in this manual is the
AC high-voltage circuit breaker type, as defined in ANSI
C37 and NEMA SG 4. All high voltage parts excluding the
roof bushings are completely enclosed within grounded
metal barriers. Secondary control compartment and pri-
mary circuits are isolated from each other by barriers.
Siemens power circuit breakers carry a type designation
as shown in Table 1. This designation may appear on draw-
ings and familiarity with them will simplify communica-
tions with the factory.
Table 1. Power Circuit Breaker Designation
DESIGN
Bolted Cabinet
TYPE
SDV-4A
3