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Siemens 7XT3300-0BA00 20Hz Frequency Generator for Earth Fault Protection

Siemens 7XT3300-0BA00 20 Hz frequency generator for stator earth fault protection.

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ManufacturerSiemens

Part number7XT3300-0BA00

Frequency 20 Hz

Output Voltage Approx. 25V (square wave)

Power Consumption Approx. 80VA

Power Supply Station Battery (100-220V DC)

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Generates 20Hz square wave Enables 100% stator earth fault protection Low power consumption Operates with 7UM515 relay Robust design

Product description

The Siemens 7XT3300-0BA00 is a 20 Hz frequency generator specifically designed for 100% stator earth fault protection. It generates a 20Hz square wave voltage (approx. 25V amplitude) that is processed through a bandpass and load resistor connected to the generator's stator circuit.

This generator is a key component in advanced earth fault detection systems for large generators, ensuring protection even for faults close to the neutral point. It can be powered via the station battery (100-220V DC) and has a maximum power consumption of approximately 80VA, with measurement value processing handled by a 7UM515 in a 7XP20 case.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 7XT3300-0BA00. Secure critical protection components for your power generation assets from our reliable inventory.

Technical specifications

Frequency	20 Hz
Output Voltage	Approx. 25V (square wave)
Power Consumption	Approx. 80VA
Power Supply	Station Battery (100-220V DC)
Case	7XP20

Common applications

Power generation

Large generators

Stator protection

Earth fault detection

Generator maintenance

Compatible systems

Siemens 7UM515 protection relay, 7XP20 case, 100-220V DC power supply

Also known as

Siemens 7XT3300-0BA00 20Hz Generator Siemens Stator Earth Fault Frequency Source

Replaces / compatible with

This frequency generator is part of a system for 100% stator earth fault protection, typically used with Siemens protection relays like the 7UM515 in a 7XP20 case.

Technical note

Expert tip

Proper connection to the station battery and integration with the 7UM515 relay are crucial for the correct operation of this 20Hz frequency generator system.

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Frequently asked questions

How does the Siemens 7XT3300-0BA00 generator enable 100% stator earth fault protection?

The Siemens 7XT3300-0BA00 generates a low-frequency (20Hz) signal that is injected into the stator winding. This allows protection relays like the 7UM515 to detect small resistance imbalances that would otherwise be undetectable at the fundamental power frequency, thus providing 100% stator earth fault coverage.