7
Instruction manual
| Types SDV-R and SDV-R-AR distribution circuit breakers
Scope
These instructions cover the installation,
operation and maintenance of a Siemens type
SDV-R distribution circuit breaker. The
equipment designs described in this
instruction manual consists of free-standing
outdoor distribution circuit breakers for
application up to 38 kV. Typical type SDV-R
and SDV-R-AR distribution circuit breakers are
shown in Figure 1. All diagrams, descriptions,
and instructions apply to all of the above
classes and designs unless noted otherwise.
Standard construction details of the circuit
breaker including the 3AH35-SDV-R operator
are given in the appropriate sections of this
instruction manual.
Special mechanical and electrical devices,
furnished in accordance with purchase order
requirements, are covered by supplementary
instructions submitted with the customer
drawing package and are in addition to this
instruction manual.
The equipment furnished has been designed
to operate in a system having the circuit
capacity specified by the purchaser. If for any
reason the equipment is used in a different
system or if the short-circuit capacity of the
system is increased, the ratings of the
equipment, including the momentary rating
and the interrupting capacity of the type
SDV-R distribution circuit breaker must be
checked. Failure on the part of the user to
receive approval of intended changes from
Siemens may cause the warranty to be void.
This instruction manual applies to SDV-R and
SDV-R-AR distribution circuit breakers only.
For other equipment, please refer to the
relevant instruction manual.
General description
The distribution circuit breaker described in
this instruction manual is of the ac high-
voltage outdoor circuit breaker type, as
defined in the relevant ANSI/IEEE standards.
All high-voltage parts excluding roof bushings
are completely enclosed within grounded
barriers. The secondary control devices and
primary circuits are isolated from each other
by barriers.
Siemens distribution circuit breakers carry a
type designation, as shown in Table 1. This
designation may appear on drawings and
familiarity with them will simplify
communications with the factory.
The SDV-R-AR is classified as arc-resistant, as
defined in ANSI/IEEE C37.20.7, and has been
qualified to carry a type 2B accessibility
rating. The arc-resistant features are intended
to provide an additional degree of protection
to personnel in close proximity to the
equipment in the event of an internal arcing
fault while the equipment is operating under
normal conditions.
Normal conditions include the “usual service
conditions” defined in ANSI/IEEE C37.04 and
ANSI/IEEE C37.010.
For the SDV-R-AR arc-resistant version, the
following conditions intended to maintain the
integrity of the equipment during an internal
arcing fault event are in addition:
1. All doors and panels providing access to
primary compartments must be closed
and properly secured (All bolts installed
and tightened. All latches in latched
position.)
2. All pressure relief devices must be free to
operate as designed.
3. The fault energy available to the
equipment must not exceed the internal
arcing short-circuit current rating and
rated arcing duration of the equipment.
4. There must be no obstructions around the
equipment that could direct the arcing
exhaust products into an area intended to
be protected.
5. The equipment must be properly
grounded.
6. All equipment must be properly installed
in accordance with information in
instruction manuals and drawings.
7. The type SDV-R-AR enclosure must be
installed with the arc-exhaust vents at
least 79” (2.0 m) above finished grade.
Operator
Type
Stored energy
SDV-R
SDV-R-AR
Table 1: Distribution circuit breaker
designations
