Vacuum interrupter/ operator

 

21.0

25.0

27.0

 

 

 

 

 

Indirect releases (dual-trip or

 

 

 

 

 

 

undervoltage) (optional)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The indirect release provides for the

23.0

 

 

33.0

conversion of modest-control signals into

 

 

powerful mechanical-energy impulses. It is

 

 

 

 

 

 

 

31.0

 

 

 

 

 

 

 

11.0

 

 

 

 

 

 

 

 

primarily used to trip medium-voltage

13.0

 

 

 

 

 

 

 

7.0

circuit breakers while functioning as a

 

 

 

 

 

 

 

secondary (dual-trip) release or

 

 

 

 

 

9.0

 

 

1.0

undervoltage-release device.

15.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5.0

 

 

 

 

 

 

 

 

These releases are mechanical-energy

 

 

 

 

 

 

 

 

storage devices. Their internal springs are

3.0

 

 

 

 

 

 

 

 

charged as a consequence of the circuit-

 

 

 

 

 

 

 

 

 

breaker mechanism operation. This energy

1.0

- Magnet core

 

15.0 - Tripping pin

is released upon application or removal (as

 

appropriate) of applicable control voltages

3.0

- Housing

 

21.0 - Locking pin

 

(refer to Figure 23: Construction of

6.0

- Mounting holes

 

23.0 - Striker pin

secondary shunt release (shown charged)

7.0

- Magnet coil

 

25.0 - Latch

and Figure 24: Latch details (shown

 

charged) on page 30 and Figure 25:

 

 

 

 

 

 

 

 

 

9.0

- Magnet armature

 

27.0 - Spring

Undervoltage lock/operate selection on

11.0 - Tension spring

 

31.0 - Striker-pin spring

page 31).

13.0 - Adjusting (factory-set) screw 33.0 - Terminal block

Secondary shunt release (optional)

 

for 11.0

 

 

 

 

 

 

 

(54.2)

 

 

 

 

 

 

 

 

 

A secondary shunt release (second trip

Figure 23: Construction of secondary shunt release (shown charged)

coil) is used for electrical tripping of the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

circuit breaker by protective relays or

 

 

 

Locked/unlocked selection screw

manual-control devices when more than

 

 

 

one trip coil is required. The second trip

23.0

25.0

 

(undervoltage release only)

 

coil is generally connected to a separate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29.0

 

auxiliary supply (dc or ac) from the control

 

 

 

 

 

 

supply used for the normal trip coil.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Undervoltage release (optional) (54.2)

 

 

 

 

 

 

 

 

 

The undervoltage release is used for

 

 

 

 

 

 

 

 

 

continuous monitoring of the tripping-

 

 

 

 

 

 

 

 

 

supply voltage. If this supply voltage falls

 

 

 

 

 

 

 

 

 

excessively, the undervoltage release will

 

 

 

 

 

 

 

 

 

provide for automatic tripping of the circuit

 

 

 

 

 

 

 

 

 

breaker.

 

 

 

 

 

 

 

 

 

The undervoltage device may be used for

 

 

 

 

 

 

 

 

 

manual or relay tripping by employing a

 

21.0

 

27.0

 

 

 

contact in series with an undervoltage-

21.0 - Locking pin

 

 

 

 

 

 

 

device holding-coil.

 

 

 

 

 

 

 

 

23.0 - Striker pin

25.0- Latch

27.0- Spring

29.0 - Lower connection terminal

Figure 24: Latch details (shown charged) 30

Page 30
Image 30
Siemens 38-3AH3 38 kV Indirect releases dual-trip or, Undervoltage optional, Secondary shunt release optional, 54.2

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.