CDG11 ALSTOM
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CDG11 ALSTOM

Installation and Maintenance

Pre-installation preparation: Before installing the Alstom CDG11 relay, ensure the switchgear or panel has been de-energized and verified safe. Check the CTs (Current Transformers) feeding the relay for correct secondary rating (1 A or 5 A depending on the CDG11 variant), correct polarity, secure mounting, and wiring integrity. Confirm that the flush panel/case size “1D V 10T” is accommodated in the panel cut-out. Inspect that the intended ambient temperature, humidity, and mounting location meet the relay’s operational environment; avoid locations with excessive vibration, dust, or moisture. Make sure mounting is flush, the relay flag indicator is visible, and that there is suitable space behind the relay for wiring and heat dissipation.

Maintenance recommendations: Periodically inspect the Alstom CDG11 for mechanical cleanliness, ensuring dust or debris is removed, especially around the contact and flag mechanisms. Test contact continuity and operation periodically, including manually triggering or simulating a fault to ensure the relay trips correctly and the flag indicator operates. Heat rise tests or checking coil condition may be required under heavy loads. Verify the CT circuits remain within burden limits; excessively high burden can lead to inaccurate operation or delayed tripping. Confirm that all connections are tight, corrosion-free, and insulated. If possible, calibrate or verify the current setting taps and time delay settings against a test set. Log and monitor any frequent trips or nuisance activations to detect system misconfiguration, CT mismatches, or background leakage or ground currents.

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    • Description

    Here’s a complete and polished description for the Alstom CDG11 relay product family (with focus on the CDG11 series), based on the data available and typical use. If you have a specific variant (e.g. CDG11AF006SACH), I can tailor it further.

    Product Overview

    The Alstom CDG11 is an electro-mechanical over-current and earth-fault protection relay from Alstom, designed for industrial and utility electrical protection systems. The CDG11 family implements IDMT (Inverse Definite Minimum Time) characteristics, meaning that fault clearing time decreases as fault current increases, while maintaining a defined minimum time. The Alstom CDG11 relays are self-powered and built to deliver reliable protection without requiring external auxiliary supply in typical configurations.

    Variants of Alstom CDG11 (for example CDG11AF006SACH, CDG11AF014SA(M)) provide settings for earth fault (E/F), under-voltage (U/V) or over-current (O/C) protection depending on model. The relays are part of Alstom’s time-inverse protection relay lineup, intended to protect electrical systems from overloads and ground faults in transformer, generator, feeder and bus bar circuits. The robust design, adjustable settings, and standard-case formats make Alstom CDG11 a go-to choice for secondary protection in power distribution, especially in legacy systems that still rely on electromagnetic disc relays.

    The Alstom CDG11 series is valued for its simplicity, reliability, and well-proven performance in harsh industrial environments. Users gain from adjustable current and time settings, mechanical indicators or flags to show tripping status, and sturdy contacts. These relays provide fundamental protection functions in electrical control panels or switchgear, either as standalone protective devices or as parts of larger protection schemes.

    Main Features and Advantages

    The Alstom CDG11 relay series offers a blend of simplicity, rugged construction, and proven functionality, especially suited to foundational over-current and earth-fault protection.

    Reliable protection with IDMT characteristic: The CDG11 relays follow inverse time overcurrent/earth-fault curves so that fault currents are cleared faster, while minor overloads allow tolerable delay, thus preserving system selectivity and limiting damage. This makes Alstom CDG11 suitable for coordination in a cascade protection scheme, avoiding nuisance tripping and maintaining stability.

    Self-powered operation: Many variants in the CDG11 family function without need for auxiliary supply for their primary protection elements (especially for earth fault and overcurrent), lowering system complexity and increasing reliability in cases of auxiliary power failure. This ensures that critical protection stays active even when control power is lost.

    Adjustable settings: The relays allow setting of current trips (e.g. 0.1-0.4 A, 0.5-2 A, etc.) and time delay taps (e.g. ~1.3 seconds or longer depending on variant), enabling fine-tuning to match CT sizing, load conditions, and desired coordination with upstream/downstream protective devices. CDG11’s settings flexibility helps in adapting one relay model across various feeders, loads, or circuits.

    Mechanical indicator / flag: Alstom CDG11 variants typically include a mechanical trip flag or indicator, which provides visible confirmation that the relay has operated. This assists in troubleshooting, visual inspection, and maintenance without requiring energizing or digital read-out tools.

    Robust contacts and case format: The electromechanical design of CDG11 gives durable contact operation, capable of withstanding many cycles. The standard case size (1D V 10T) and flush mounting support compatibility with existing panels and switchgear. The simple contact configuration (2 N/O self-resetting) ensures clear, consistent behavior.

    Low burden: Many versions of CDG11 present a low burden (in VA) on the CT circuits, minimizing added load on measurement transformers and staying within CT capacity even in complex systems. This helps reduce measurement distortion and maintain accuracy.

    Application Field

    The Alstom CDG11 relays are used in a wide range of electrical protection scenarios in industrial power systems, utilities, and process plants. In power distribution substations, CDG11 is deployed to protect feeders against overcurrent and earth faults, particularly in non-directional protection schemes where directional detection is not needed.

    In industries such as oil & gas, mining, petrochemical, water treatment, and manufacturing, the CDG11 serves in switchgear panels, transformer protection circuits, generator backup protection, and bus‐bar protection. When loads are variable or intermittent, the adjustable time-delay and current settings of CDG11 allow system engineers to coordinate with upstream devices to ensure only the faulty section is isolated.

    Further, in infrastructure utilities (rail traction power, public utilities, power plants), CDG11 relays help maintain safety and reliability by clearing earth faults or overcurrent events quickly, preventing equipment damage, fire risk, or service interruption. Their ruggedness and self-powered options make them suitable for remote or harsh locations where auxiliary power reliability is less certain.

    CDG11 ALSTOM

    Related Products

    • CDG11AF006SACH – A variant with lower current settings (~0.1-0.4 A), tailored to lighter circuits or sensitive earth fault detection

    • CDG11AF014SA(M) – Variant offering a broader current setting range (e.g. ~0.5-2.0 A) for heavier feeders or different load profiles

    • CDG11AF003SACH – A model with certain default settings of current / earth-fault thresholds suited to general overcurrent protection

    • CDG11AF016SACH – Another variant emphasizing more precise setting resolution or alternative CT secondary rating

    • CDG11AF013SCCH – Variant offering contact configuration differences (e.g. additional auxiliary or NO/NC contacts)

    • CDG11AF015SA(M) – Higher current range options in the CDG11 family

    • CDG11AF014SCCH – Similar to CDG11AF014SA(M) but with different internal calibration or case/style (“SCCH”) for mounting or environmental options

    Each related model differs primarily in setting ranges (current/earth fault), contact configuration (type and number), burden/time delay, and sometimes mounting or case style. All share the core protection principles of the Alstom CDG11 baseline.

    Product Guarantee

    The Alstom CDG11 products are manufactured under rigorous quality control standards to ensure long-term reliability and compliance with industry protection norms. Each relay is tested for mechanical accuracy, contact operation, time/current characteristic conformity, and environmental resilience before delivery. There is a warranty covering manufacturing defects in materials or workmanship, during which Alstom (or its authorized service centers) will repair or replace units not meeting performance specifications.

    Alstom supports after-sales service including technical assistance for selecting correct relay variant, adjusting protection settings, replacing worn contacts, and verifying system coordination. Spare parts like auxiliary contacts, flag indicators, and relay cases are available to maintain continuity of service. With Alstom CDG11 relays in your protection scheme, you gain not only proven protection hardware but also a partner committed to sustaining performance, uptime, and safety throughout the equipment lifecycle.

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