Installation checks and functional tests

Hazardous voltage and high-speed moving parts.

Will cause death, serious injury and property damage.

Read instruction manuals, observe safety instructions and use qualified personnel.

Introduction

This section provides a description of the inspections, checks and tests to be performed on the circuit breaker prior to operation in the metal-clad switchgear.

Inspections, checks and tests without control power

Vacuum circuit breakers are normally shipped with their primary contacts OPEN and their springs DISCHARGED. However, it is critical to first verify the DISCHARGED condition of the spring-loaded mechanisms after de-energizing control power.

De-energizing control power in switchgear

When the circuit breaker is mounted in switchgear, open the control-power disconnect device in the metal-clad switchgear cubicle.

The control-power disconnect device is normally located on the secondary-device panel in the upper cell of the vertical section. The normal control-power disconnect device is a pullout-type fuse holder. Removal of the fuse holder de- energizes control power to the circuit breaker in the associated switchgear cell. In some switchgear assemblies, a molded- case circuit breaker or knife switch is used in lieu of the pullout-type fuse holder. Opening this circuit breaker or switch accomplishes the same result: control power is disconnected.

Spring-discharge check (refer to Figure 1: Type 38-3AH3 vacuum circuit breaker front panel controls on page 8)

Perform the spring-discharge check before removing the circuit breaker from the pallet or removing it from the switchgear.

The spring-discharge check should be performed after de-energizing control power. This check assures both the tripping and closing springs are fully discharged.

Note: Do not perform the spring-discharge check if the circuit breaker is in the CONNECT position. Open the circuit breaker and rack to the DISCONNECT position, and then perform the spring- discharge check.

1.Press red trip pushbutton.

2.Press black close pushbutton.

3.Press red trip pushbutton again.

4.Verify spring-condition indicator shows

DISCHARGED.

5.Verify main contact status indicator shows OPEN.

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Siemens 38-3AH3 38 kV Installation checks and functional tests, Inspections, checks and tests without control power
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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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