Bender IRDH375B-427 Insulation Monitoring Device

Description

Bender IRDH375B-427 Insulation Monitoring Device

Product Dimensions：

The Bender IRDH375B-427 is an advanced Insulation Monitoring Device (IMD) designed for unearthed AC, AC/DC, and DC systems (IT systems). It is part of the ISOMETER® family and is specifically engineered to monitor insulation resistance in systems with high leakage capacitances or variable speed drives.

Product Detailed Description

The IRDH375B-427 utilizes the patented AMP Plus measurement principle. This allows the device to accurately monitor insulation levels even in modern industrial networks that contain power electronics, such as rectifiers and inverters, which often introduce DC components and high-frequency interference into the system.

Technical Parameters

Product Advantages

• Universal Monitoring: Capable of monitoring pure AC, pure DC, and hybrid systems (AC/DC) without being affected by DC offsets or harmonics.
• AMP Plus Technology: Automatically adapts to the system leakage capacitance (C_e), ensuring short measurement times and high accuracy even in large, complex networks.
• Early Fault Detection: By monitoring insulation resistance (R_F) in real-time, it provides an early warning before a second fault occurs, preventing unexpected system shutdowns.
• System Diagnostics: Includes a built-in LC display that shows the current insulation resistance value, making commissioning and troubleshooting straightforward.

Important Considerations & Precautions

• IT System Only: This device is exclusively for unearthed (IT) systems. It must not be used in grounded (TN/TT) systems as the measurement principle relies on the system being floating.
• Connection Polarity: When connecting to DC systems, ensure correct polarity for the coupling to the L+ and L- lines for optimal performance.
• One Device Per System: Only one insulation monitoring device may be connected to an interconnected IT system. Connecting multiple IMDs will cause them to interfere with each other’s measurement pulses.
• Coupling Modules: For system voltages higher than those specified (e.g., above 1100 V DC), an external coupling module (such as the AGH series) must be used.

Product Applications

The IRDH375B-427 is critical for industries where power continuity is a priority:

• Renewable Energy: Monitoring insulation in large-scale photovoltaic (PV) arrays and wind turbine control systems.
• Maritime & Offshore: Essential for ships and oil rigs where a single ground fault must not lead to a power outage.
• Industrial Automation: Protecting systems equipped with large Variable Frequency Drives (VFDs) and extensive motor cabling.
• Power Plants: Monitoring the excitation circuits of generators and auxiliary DC systems.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

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