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GE 12CEH52A1DL
Product Name: GE CEH Series Single-Phase Relay (Loss-of-Excitation Relay)
Product Introduction: Based on the GE CEH52A platform, this device belongs to GE’s family of single-phase protective relays. The CEH-type functions as a generator loss-of-excitation (LOE) protection relay, designed to detect the disappearance of synchronous machine excitation and initiate tripping action.
Detailed content
Technical Specifications:
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Relay Type: Single-phase relay (CEH52A base platform)
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Frame Size: 52A
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Frequency: 50/60 Hz universal
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Contact Configuration: Multi-group transfer contacts (A2D configuration)
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Operation Principle: Monitors machine terminal voltage and excitation current; trips when values exceed set impedance circle or voltage threshold
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Enclosure: Draw-out relay case with front dial and test button
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Terminal Connection: Rear plug-in terminals
Key Features: Impedance-circle or voltage-drop based loss-of-excitation detection; mechanical/electromagnetic hybrid construction; anti-nuisance tripping with delay timer; draw-out design for easy maintenance.
Application Scenarios: Loss-of-excitation protection for hydro and thermal synchronous generators; industrial drive synchronous machines.
Installation & Usage Notes: PT circuits must be fused; CT secondary must never be opened; relay face should be oriented toward inspection aisle; setpoints must be coordinated with excitation system; periodic loss-of-excitation simulation testing is recommended.
