12CFVB11B1A GE

Description

Product Name:     12CFVB11B1A    GE Central control module

Product details:

The GE 12CFD12B2A operates on the product-restraint principle with a variable percentage slope operating characteristic. It compares the current entering one end of a machine’s winding with the current leaving the other end. Under normal operating conditions or external faults, these currents are balanced. During an internal phase-to-phase or phase-to-ground fault, the resulting differential current trips the relay to isolate the machine rapidly, minimizing catastrophic equipment damage.

2. Technical Parameters (Product Specifications)

• Manufacturer: General Electric (GE) / GE Multilin
• Model/Catalog Number: 12CFD12B2A
• Relay Type: Electromechanical High-Speed Differential Relay (Type CFD)
• IEEE Device Code: 87 (Differential Protective Relay)
• Current Rating: 5 Amps (Standard Current Transformer secondary)
• Frequency: 60 Hz
• Target & Holding Coil Circuit: 0.2 Amps
• Case Type: Drawout case (allows easy removal of the relay unit from the housing without disturbing external wiring)
• Operating Principle: Product-Restraint with Variable Percentage Slope

3. Product Advantages

• High-Speed Fault Clearance: Swiftly detects and isolates internal faults to minimize thermal and mechanical damage to expensive stator windings.
• Product-Restraint Stability: The variable percentage slope ensures high immunity against false tripping caused by heavy external through-faults, power surges, or Current Transformer (CT) saturation.
• Time-Tested Reliability: Heavy-duty electromechanical construction built to withstand harsh industrial substation environments for decades.
• Drawout Construction: Features a convenient drawout case that simplifies routine testing, calibration, and maintenance without disconnecting field wires.

4. Product Applications

The GE 12CFD12B2A is explicitly applied in heavy power systems to protect the following equipment against internal phase-to-phase and phase-to-ground faults:

• AC Generators: Highly recommended for large generators rated at 2,000 kVA and above.
• Large Motors: Used for high-capacity industrial synchronous or induction motors rated at 3,000 HP (or kVA) and above.
• Synchronous Condensers: Protects grid-stabilizing synchronous condensers of 3,000 kVA and above.
• Frequency Converters: Used in large industrial machinery power conversion loops.

5. Important Safety & Operational Notes

⚠️ What the Relay WILL NOT Protect Against:

• Turn-to-turn faults within the same machine winding phase.
• Open circuits in the machine windings.
• System overloads or purely external short circuits.
• Ground faults on ungrounded systems (unless a second ground fault occurs on a separate phase).

• CT Matching: Proper application requires matched Current Transformers (CTs). Extreme mismatches or poor CT excitation characteristics can lead to improper relay restraint or sensitivity issues.
• Simultaneous Tripping: For optimum machine protection, the relay’s trip contact should simultaneously actuate the main circuit breaker, the neutral breaker (if grounded), and the field breaker using a hand-reset auxiliary relay.
• Maintenance & Calibration: Being an electromechanical device, it requires periodic inspection, contact cleaning, and calibration tracking to ensure the spring tensions and magnetic gaps match factory specification books (Reference Instruction Book: GEK-34124 or GEH-2022).

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Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: United States
Price: Please contact us Product weight：0.515kg
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service

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