BENDER IRDH265-4

The BENDER IRDH265-4 is an insulation monitoring device (A-ISOMETER®) primarily designed for continuous monitoring of insulation resistance in ungrounded (IT) systems. It's part of the Series 260 and plays a crucial role in preventing electrical accidents and ensuring system reliability.

Product Description

The BENDER IRDH265-4 is a microprocessor-controlled device that continuously measures the insulation resistance in IT systems. These systems often contain complex components like converters, power converters, and thyristor controls, which can introduce high system leakage capacitances to earth. The IRDH265-4 utilizes the AMP (Adaptive Measurement Principle), which allows it to automatically adapt to varying system conditions and provide accurate readings even in the presence of such complexities.

Product Parameters (Key Specifications)

While detailed specifications can vary slightly depending on the exact variant and manufacturing date, here are some common parameters for the BENDER IRDH265-4:

• Part Number: IRDH-265-4

• Category: Data Control System / Monitor/Control

• Intended Use: Insulation monitoring in IT AC systems, IT AC systems with rectifiers and galvanically connected DC circuits, and IT DC systems (isolated power supplies).

• Supply Voltage: Typically 230 VAC, 50/60 Hz. Other supply voltages may be available.

• Measurement Range: High measurement accuracy, typically in the range of 10 kΩ to 990 kΩ.

• Display Accuracy: Often ±20% within its measurement range.

• Operating Temperature: Generally -10 °C to +55 °C (note: proper ventilation is advised if ambient temperature exceeds 40°C).

• Storage Temperature: Typically -40 °C to +70 °C.

• System Leakage Capacitance: Automatic adaptation to system leakage capacitances up to 500 µF (and potentially up to 1000 µF with certain configurations/coupling devices).

• Response Time: Varies based on measurement principle and system conditions. Can be less than 1 second for direct ground faults under asymmetric measurement.

• Adjustable Response Values: Features two adjustable alarm response values (e.g., 10 kΩ to 990 kΩ).

• Interface: Equipped with an RS485 interface for data transmission (e.g., 9600 Baud - 1 Startbit - 1 Stopbit - 8 Data bit, max cable length 1200m).

• Display: LCD display for indicating insulation resistance values and alarms.

• Self-Test: Automatic self-test function, often triggered if insulation resistance exceeds a certain threshold (e.g., 20 MΩ) or every 24 hours.

• Connection Monitoring: Continuously monitors connections to the ungrounded system and ground.