Maintenance and troubleshooting

Table 7: Troubleshooting

Problem

Symptoms

Possible causes and remedies

Circuit breaker fails to close.

Closing spring will not automatically charge.		1.	Secondary control circuit is de-energized or
			control circuit fuses are blown. Check and
			energize or replace if necessary.
		2.	Secondary disconnect contacts 15 or 16 are
			not engaging. Check and replace if required.
		3.	Damage to wiring, terminals or connectors.
			Check and repair as necessary.
		4.	Failure of charging motor (88.0). Replace if
			required.
		5.	Motor cut-off switch LS21 or LS22 fails to
			operate. Replace if necessary.
		6.	Mechanical failure of operating mechanism.
			Check and contact regional service centers,
			the factory or telephone Siemens field
			service at +1 (800) 347-6659 or +1 (919)
			365-2200 outside the U.S.

Closing springs	Closing coil or solenoid	1.	Secondary control circuit de-energized or
charge, but circuit	(52SRC) fails to		control circuit fuses blown. Correct as
breaker does not close.	energize. No sound of		indicated.
	circuit breaker closing.	2.	No closing signal to secondary disconnect
		2.	No closing signal to secondary disconnect
			pin 13. Check for continuity and correct
			protective relay logic.
		3.	Secondary disconnect contacts 13 or 15 are
			not engaging. Check and correct as
			required.
		4.	Failure of anti-pump relay (52Y) contacts 21
			to 22, 31 to 32 or 13 to 14. Check and
			replace as required.
		5.	Failure of close coil (solenoid) (52SRC).
			Check and replace as required.
		6.	Auxiliary switch NC contacts 41 to 42 are
			open when circuit breaker contacts are
			open. Check linkage and switch. Replace or
			adjust as necessary.
		7.	Spring-charged switch LS9 NO contacts
			remain open after springs are charged.
			Check and replace as required.

	Closing coil energizes.	1.	Mechanical failure of operating mechanism.
	Sound of circuit		Check and contact regional service centers,
	breaker closing is heard		the factory or telephone Siemens field
	but circuit breaker		service at +1 (800) 347-6659 or +1 (919)
	contacts do not close.		365-2200 outside the U.S.

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.