Overview

This technical document provides a comprehensive guide to electrodynamic voltage stabilizers (ERESTAB) designed for single-phase 230V and three-phase 400V mains operating at 50/60Hz. It includes model classifications, technical specifications, operational principles, and optional accessories. The document also covers compliance with relevant European standards.

1. Model Classifications and Applications

• Single-Phase Models (230V): Identified by 'M' series, these stabilizers include range selectors to adjust power ratings.
• Three-Phase Models (400V): Divided into two main types:
  • T models: Regulate voltage based on the average of the three phases, suitable for balanced loads with up to 50% phase unbalance. These use a single stabilizing circuit and are cost-effective.
  • Y models: Provide independent regulation for each phase, suitable for unbalanced loads with up to 100% phase unbalance. Require a neutral wire (4-wire input).
• Asymmetrical Models: Available for both single-phase and three-phase systems with independent phase regulation, designed for highly unbalanced conditions.

2. Technical Features and Operation

• Voltage stabilizers do not transform voltage but deliver the rated input voltage at output. External transformers are required if input and output voltages differ.
• All models operate correctly at both 50 Hz and 60 Hz frequencies.
• Standard output accuracy is ±1%, with optional enhanced accuracy of ±0.5% available upon request.
• Range selectors on 'M' and 'T' models allow selection of power ratings; other models require specification of power needs.
• Neutral connection is mandatory for Y models to ensure proper operation.

3. Compliance and Standards

• All models comply with European directives:
  • Electromagnetic Compatibility (EMC) Directive 89/336/EEC and amendments.
  • Low Voltage Electrical Equipment Directive 73/23/EEC and amendments.
• Models can be connected to mains without neutral except where specified.

4. Optional Accessories and Special Versions

• Available optional fittings include:
  • Ammeters, frequency meters, multifunction meters.
  • Input/output circuit breakers (with or without earth leakage).
  • Automatic or manual bypass switches.
  • Isolation transformers, surge suppressors (lightning protection).
  • Over/under voltage protection relays.
  • Thermal relays, soft-start devices.
  • Phase absence and phase reversal protection.
  • Tropicalized versions and IP54 rated outdoor versions.

5. Technical Data and Model Specifications

The document includes detailed tables listing models with parameters such as nominal power, nominal current, voltage variation range, response time, accuracy, standard accessories, IP protection rating, dimensions, and weight. Key points include:

• Single-Phase Models (M series): Power ratings range from small units (e.g., M1-10L) to larger capacities (e.g., M320-10).
• Three-Phase Models with Average Regulation (T series): Cover a wide power range with selectable ranges via range selectors.
• Three-Phase Models with Independent Phase Regulation (Y series): Support high unbalance loads with detailed power and current ratings.
• Asymmetrical Models: Designed for unbalanced loads with independent phase regulation, available for both single and three-phase systems.

6. Functional Components

• Buck-boost transformers and variable transformers form the core voltage regulation mechanism.
• Electronic control circuits and servomotors manage precise voltage stabilization.
• Standard instrumentation includes voltmeters, pilot lamps, range selectors, and input circuit breakers.

7. Installation and Usage Recommendations

• Specify power requirements clearly when ordering models without range selectors.
• Ensure neutral connection for Y series models.
• Use external transformers if input and output voltage ratings differ.
• Consult factory for special features and optional fittings compatibility.

Summary

This document serves as a detailed technical reference for selecting and specifying electrodynamic voltage stabilizers suitable for various single-phase and three-phase mains configurations. It emphasizes model suitability based on load balance, power requirements, and installation conditions, while ensuring compliance with European safety and electromagnetic standards. Optional accessories and special versions enhance adaptability to diverse industrial and commercial applications.