Overhaul

D.Solenoid mounting screws must be installed using thread locking adhesive (Loctite #222, Siemens part 15-133-281-007) and primer (Loctite primer T, Siemens part 15- 133-281-005).

E.Connect wires to coils with new "push on" wire terminals (Siemens part 15-171-600-002).

3.Lubricate operating mechanism in accordance with instructions that follow.

4.When work is finished, operate circuit breaker, close/open several times, and check that all screw connections are tight.

Vacuum interrupter replacement

It is recommended that vacuum interrupters be replaced only by a qualified Siemens representative. The information in the following sections is provided to aid in understanding the replacement procedures.

Replacement vacuum interrupters are furnished as a complete assembly, and have been completely tested and mechanically conditioned.

It is recommended one vacuum interrupter be removed and replaced completely rather than removing two or more vacuum interrupters at a time.

The following procedure describes the procedure for removing and replacing a vacuum interrupter. Components may be identified by referencing Figure 46: Vacuum interrupter replacement illustration on page 56 and Figure 47: Illustration showing required technique for fastening terminal-clamp hardware on page 57.

Note: Special care needs to be exercised in removal or installation of hardware around the bottom, or movable contact end, of the vacuum interrupter.

The movable contact uses a metal bellows to maintain the vacuum seal while still permitting up and down motion of the contact. This metal bellows is rugged and reliable, and is designed to withstand years of vertical movement. However, care should be exercised to avoid subjecting the metal bellows to excessive torque during removal and replacement. Twisting the metal bellows through careless bolt removal or tightening may damage the vacuum interrupter.

1.0Removing the vacuum interrupter

1.1Before starting work, the circuit breaker should be isolated from all primary- and control-power sources and all stored energy discharged by tripping, closing and tripping the circuit breaker by hand. Discharge any static charge by grounding both ends and the center metal section of the vacuum interrupter. Carefully remove outer-phase and inter-phase barriers.

1.2Loosen the lateral bolt(s) on terminal clamp (29.2). Refer to Figure 47: Illustration showing required technique for fastening terminal- clamp hardware on page 57 and employ the illustrated procedure to loosen clamp hardware (6 or 8 mm hex-key and 13 or 16 mm socket).

1.3Withdraw pin (48.5) from insulating coupler (48.0) and levers (48.6).

1.4Remove coupling pin from the eye bolt (36.3).

1.5Free struts (28.0) from the upper pole-support (20.0). Loosen the strut hardware on the lower support (40.0) and swing the struts forward and downward (16 mm open-end wrench and 16 mm socket).

1.6Loosen screws that secure the centering ring (28.1) (10 mm open- end wrench).

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Siemens 38-3AH3 38 kV instruction manual Overhaul, Vacuum interrupter replacement
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38-3AH3 38 kV specifications

The Siemens 38-3AH3 is a high-voltage circuit breaker designed for medium voltage applications, particularly in substations and industrial environments. This device operates at a voltage level of 38 kV, showcasing Siemens' commitment to innovation and reliability in electrical engineering.

One of the main features of the Siemens 38-3AH3 is its advanced interruption technology, which employs the proven hybrid design combining both gas-insulated and air-insulated technologies. This hybrid approach not only enhances the breaker's performance and reliability but also minimizes its footprint, making it an ideal choice for space-constrained environments.

The Siemens 38-3AH3 uses vacuum interruption technology, allowing for efficient switching with minimal wear and tear. The vacuum interrupters are highly reliable and provide excellent performance under various operating conditions. This technology ensures that the circuit breaker can handle short circuits and overloads effectively, thus protecting the entire electrical system.

Additionally, the Siemens 38-3AH3 incorporates intelligent monitoring systems. These digital technologies provide real-time data on breaker status, operational performance, and maintenance needs. This predictive maintenance capability helps operators to identify potential issues before they develop into significant problems, ultimately leading to reduced downtime and maintenance costs.

Another notable characteristic of the Siemens 38-3AH3 is its high insulation strength. Thanks to its robust design and development, this circuit breaker can withstand adverse environmental conditions, making it suitable for use in diverse geographical locations and climates. Its components are designed to resist contamination and corrosion, ensuring long-term reliability.

The Siemens 38-3AH3 also offers enhanced safety features. It includes protective relays and automatic fault detection systems that isolate faults quickly, preventing damage to downstream equipment. Furthermore, the design allows for easy maintenance, with components that are accessible without the need for extensive disassembly.

In summary, the Siemens 38-3AH3 38 kV circuit breaker is a leading solution in high-voltage protection and control, characterized by its advanced interruption technology, integrated monitoring systems, high insulation strength, and user-friendly maintenance features. Its innovative design and engineering make it a trusted choice for utilities and industrial facilities aiming to enhance the reliability and safety of their electrical systems.
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