Description
RXIDK2H 1MRK000838-HA ABB module
Here is an overview of the ABB RXIDK2H Time Overcurrent Relay:
RXIDK2H 1MRK000838-HA ABB module
Brand Overview
- Brand: ABB (Asea Brown Boveri)
* About the Brand: ABB is a leading global technology pioneer in substation automation, power grid components, and industrial electrification. Their protection and control relays are internationally recognized for providing extreme high-speed performance, excellent mechanical stability, and critical safety interlocks within high-voltage environments.
Product Identification
- Model Designation: RXIDK 2H / RXIDK2H
* Product ID / Part Number: 1MRK000838-HA
* Product Type: Microprocessor-Based Time Overcurrent Relay Module
* Product Family: COMBIFLEX Modular Protection and Control Relay System
Technical Specifications
- Core Functionality: Operates as a specialized, high-precision single-phase overcurrent and earth-fault protection relay. It constantly monitors alternating current (AC) lines and triggers a physical trip or alarm command when the current crosses predefined limits or stays excessive for a designated timeframe.
* Rated Current (Ir): Commonly configured for standard 1 A or 5 A current transformer (CT) secondary inputs.
* Timing Characteristics: Offers dual operational curves:
* Definite Time (DT): Delivers a fixed, adjustable delay interval (typically ranges around 0 to 10 seconds).
* Inverse Definite Minimum Time (IDMT): Follows standard curves (Normal Inverse, Very Inverse, Extremely Inverse, Long Time Inverse) to adjust trip timing dynamically relative to the severity of the electrical overload. -
* Reset Ratio: Highly precise reset threshold (> 97%), preventing delayed relay drop-outs once line currents normalize.
* Output Contacts: Outfitted with robust, high-capacity conversion contacts (typically 2 C/O contacts) dedicated to sending fast, independent activation signals to circuit breaker trip coils.
* Visual Diagnostics: Includes integrated front-panel LED indicators to verify operational service states, active pickup states, and definitive trip actions.
* Form Factor & Mounting: Built as a plug-in component sized specifically to slot into standard COMBIFLEX modular connection seats and mounting rack assemblies.
Target Industries
The RXIDK2H relay is utilized within electrical networks where fast short-circuit and grounding fault protection is mandatory:
- Electrical Transmission & Distribution: Stationed inside high-voltage (HV) and medium-voltage (MV) electrical utility substations.
* Power Generation Facilities: Integrated within generation plant control cabinets to monitor auxiliary generator feeds, transformers, and heavy distribution buses.
* Heavy Rail & Infrastructure: Applied in electric traction substations that supply high-capacity power lines to transit and rail networks.
* Heavy Processing Plants: Found within the localized power distribution centers of massive industrial facilities like steel mills, chemical centers, and paper mills.
Applications and Use Cases
- Feeder Overcurrent Protection: Functions as a critical protection guard on radial or loop distribution feeders to instantly isolate localized line-to-line short circuits or grounding faults.
* Backup Transformer Protection: Acts as a secondary safety shield on power transformers, executing a trip command to drop the circuit breaker if primary differential relays fail to clear a sustained overload.
* Heavy Motor Protection: Monitors current draw profiles for large high-voltage motors, initiating timed cut-offs during stalling events or severe structural overloads to prevent motor winding burnouts.
* Substation Grid Standardization: Installed as an exact, modular drop-in component by substation technicians to maintain, upgrade, or repair existing COMBIFLEX relay assemblies without needing to re-engineer panel chassis architectures.
