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Siemens 38-3AH3 38 kV Overhaul, Circuit-breaker overhaul, Circuit breaker Number Type

Models: 38-3AH3 38 kV

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Overhaul

High-potential tests employ hazardous voltages.

Will cause death, serious injury and property damage.

Read instruction manual. All work must be performed with the circuit breaker completely de-energized and the springs discharged. Limit work to qualified personnel.

Introduction

The following procedures along with the troubleshooting charts at the end of this section, provide maintenance personnel with a guide to identifying and correcting possible malfunctions of the type 38-3AH3 vacuum circuit breaker.

Circuit-breaker overhaul

Table 5 gives the recommended overhaul schedule for a type 38-3AH3 vacuum circuit breaker. These intervals assume that the circuit breaker is operated under "usual service conditions" as discussed in ANSI/ IEEE C37.20.2, section 8.1 and ANSI/IEEE C37.04, section 4, and elaborated in ANSI/ IEEE C37.010, section 4.

When actual operating conditions are more severe, overhaul periods should occur more frequently. The counter on the front panel of the circuit breaker records the number of operations.

Circuit breaker

 

Number of

type

 

closings

 

 

 

38-3AH3

 

10,000

 

 

 

Table 5: Overhaul schedule

 

Replacement at overhaul

The following components are replaced during an overhaul of the circuit breaker, when required:

Vacuum interrupters as determined by vacuum-integrity test, contact erosion or after 10,000 operations

Spring-release coil, 52SRC

Shunt-trip coil, 52T

Auxiliary switch

Trip-free drive-bar mechanism.

When these parts are changed, locking devices must also be removed and replaced. These include lock washers, retaining rings, retaining clips, spring pins, cotter pins, etc.

1.Replace vacuum interrupters, instructions follow (refer to page 49).

2.Spring-release coil (52SRC) or shunt- trip coil (52T).

A.Remove two "push on" terminal connections

B.Remove two M4 hex-head screws and dismount solenoid.

C.Install replacement solenoids with two M4 hex-head screws and new lock washers.

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Siemens 38-3AH3 38 kV Overhaul, Circuit-breaker overhaul, Circuit breaker Number Type, Replacement at overhaul
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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.