3AH3 Vacuum Circuit-Breakers
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3AH3 Vacuum Circuit-Breakers Medium-Voltage Equipment

3AH3 Vacuum Circuit-Breakers · Siemens HG 11.03 · 2018

Contents 3AH3 Vacuum Circuit-Breakers Medium-Voltage Equipment Catalog HG 11.03 • 2018 Construction and mode of operation, standards, maintenance-free design 7 Ambient conditions, current carrying capacity, dielectric strength 9 Basic equipment and product range overview 10 The three-circuit-breaker-solution for "phase-segregated" design 12 Order number structure and configuration example 14 Selection of basic types, high-current circuit-breakers (circuit-breakers according to IEC 62271-100) 15 Selection of basic types, generator circuit-breakers according to IEC/IEEE 62271-37-013 18...

3AH3 Vacuum Circuit-Breakers · Siemens HG 11.03 · 2018

Description Contents Contents Page Pole assemblies Operating mechanism Trip-free mechanism Circuit-breaker tripping signal Industrial application: Refinery Switching medium Maintenance-free design Ambient conditions, current carrying capacity and dielectric strength Basic equipment and product range overview The three-circuit-breaker-solution for ”phase-segregated“ design Construction and mode of operation 3AH3 Vacuum Circuit-Breakers · Siemens

Description General 3AH3 vacuum circuit-breaker from 7.2 kV to 36 kV – The Powerful controlling all fault conditions in the power system at the same time. 3AH3 – maintenance-free for high switching capacities 3AH3 6 / 7 / 8 – especially developed for generator applications Circuit-breakers must make and break all currents within the scope of their ratings: From small inductive and capacitive load currents up to high short-circuit currents, The 3AH3 vacuum circuit-breaker is maintenance-free throughout its entire service life. It is extremely powerful and controls up to 10,000 operating...

Description Construction and mode of operation The vacuum circuit-breaker consists of the pole assemblies (1) and the operating mechanism box (2). The pole assemblies are fixed to the operating mechanism box via post insulators (3). The switching movement is transferred by means of operating rods (4) and levers. Switching medium The vacuum switching technology, proven and fully developed for more than 40 years, serves as arc-quenching principle by using vacuum interrupters. Pole assemblies The pole assemblies consist of the vacuum interrupters (6) and the interrupter supports. The vacuum...

Description Construction and mode of operation, standards, maintenance-free design Releases A release is a device which transfers electrical commands from an external source, such as a control room, to the latching mechanism of the vacuum circuit-breaker so that it can be opened or closed. Apart from the closing solenoid, the maximum possible equipment is one shunt release and two other releases. For release combinations, refer to page 19. Circuit-breaker tripping signal The NO contact makes brief contact while the vacuum circuit-breaker is opening, and this is often used to operate a...

Description Ambient conditions, current carrying capacity and dielectric strength Ambient conditions The vacuum circuit-breakers are designed for the normal o perating conditions defined in IEC 62271‑100. Condensation can occasionally occur under the ambient conditions shown opposite. 3AH3 vacuum circuit-breakers are suitable for use in the following climatic classes according to IEC 60721, Part 3-3: Class 3K4 1) Class 3B1 Class 3M2 Class 3C2 2) Class 3S2 3) Climatic ambient conditions: Biological ambient conditions: Mechanical ambient conditions: Chemically-active substances:...

Basic equipment and product range overview 3AH3 Vacuum Circuit-Breakers ■ Siemens HG 11.03 ■ 2018

Basic equipment and product range overview Vacuum circuit-breaker for generator switching applications according to IEC/IEEE 62271-37-013 Type tests as specified in IEC 62271-100 are performed as a rule for all Siemens circuit-breakers. The generator circuit-breakers are additionally tested according to IEC/IEEE 62271-37-013. Standard IEC/IEEE 62271-37-013 includes in particular: - For generator-supplied faults: High DC components and the resulting missing current zeroes - For system-supplied faults: Higher TRV rates of rise - Higher test voltage levels. Product range overview for...

Description The three-circuit-breaker-solution for ”phase-segregated“ design The three-circuit-breaker-solution for ”phase-segregated“ design For generator switchgear with segregated phases, one switching device is used per phase. The requirements for the simultaneity of poles are implemented according to IEC 62271‑100. R-HG-1103-103 tif For the three-circuit-breaker-solution, three circuit-breakers are used which are optimized for interconnected operation. Technical data for ”phase-segregated“ design Rated short-circuit breaking current ISC (3s) Complete module with integrated...

Equipment Selection Contents Contents Page Order number structure and configuration example 14 Selection of basic types, high-current circuit-breakers (circuit-breakers according to IEC 62271-100) Selection of basic types, generator circuit-breakers according to IEC/IEEE 62271-37-013 Voltage level 17.5 kV Design Classic 18 Voltage level 24 kV Design Classic 18 Selection of secondary equipment Release combination 19 Operating voltage of the closing solenoid 20 Operating voltage of the 1st shunt release 21 Operating voltage of the 2nd release 22 Operating voltage of the 3rd release 23...

Equipment Selection Order number structure and configuration example Order number structure Special versions («) The 3AH3 vacuum circuit-breakers consist of a primary and a secondary part. The relevant data make up the 16-digit order number. The primary part covers the main electrical data of the circuit-breaker poles. The secondary part covers the auxiliary devices which are necessary for operating and controlling the vacuum circuit-breaker. In case of special versions, “-Z” is added to the order number and a descriptive order code follows. If several special versions are required, the...