02-07-2013, 04:32 PM
High Voltage Circuit Breakers 3AP Type 72.5 kV to 800 kV
High Voltage Circuit.pdf (Size: 1.48 MB / Downloads: 181)
INTRODUCTION
Decades of our experience in high voltage switching
technology go into the design and production of the 3AP
circuit breakers which set an international trend. We are
a powerful partner for our customers and a competent
supplier of attractive products and solutions at
competitive prices with the high standard of quality that
Siemens is known for. We comply with our customers’
demands for reliability, safety and cost-effectiveness
and serve them throughout the world. No matter what
your application is, the 3AP circuit breakers provide the
best solution for your requirements every time.
The Modular Design
The self compression arc-quenching principle is applied
in our 3AP circuit breakers.
The arc-assisted interrupter unit of the 3AP circuit breaker
utilizes the energy of the arc during opening for an optimal
arc quenching, allowing reducing the operating energy to a
minimum. Our circuit breakers for the voltage range 72.5 kV
up to 245 kV have one interrupter unit per pole and up to
245 kV the circuit breakers are available with a common or
a single pole operating mechanism. 3AP high voltage circuit
breakers rated for 420 kV and 550 kV are equipped with
two interrupter units per pole. At 800 kV voltage level, the
breakers are available with four interrupter units.
The Stored-Energy Spring Mechanism
There are a number of advantages to
our stored-energy spring mechanism
Compact housing can be utilized by
applying the most modern production
techniques. Since the closing and opening
springs are housed in the operating
mechanism, a compact and sturdy
structure is achieved. This design results in
a small number of moving parts. The use
of roller bearings and the maintenancefree
spring mechanism are a prerequisite
for decades of reliable operation. Proven
design principles such as vibration-isolated
latches and load-free isolation of the
charging mechanism are retained.
Routine testing
The main components of the circuit breakers are subjected
to complete pre-acceptance testing before assembly. Based
on this quality level, it is possible to confirm a leakage rate
of less than 0.5% per year for the circuit breaker. Each circuit
breaker is completely assembled in the test bay. The product
specific inputs for computer-assisted routine testing are
imported from the order processing tools. This ensures that
in addition to the standard test procedure, the fulfillment of
every customer requirement is checked before delivery.