BENDER IRDH265-4 Insulation Monitoring Device

Product Detailed Description

• Core Function: The primary function of the IRDH265-4 is to detect and signal insulation faults (a reduction in insulation resistance) in ungrounded electrical systems before a hazardous situation or system shutdown occurs. Unlike grounded systems where a fault leads to immediate tripping, IT systems require continuous monitoring to ensure safety and operational continuity even with a first fault.

• Measurement Principle (AMP): It employs Bender's patented AMP (Advanced Measuring Principle) technology. This principle superimposes a pulsating AC measuring voltage onto the monitored system. By analyzing the current flow in response to this pulse, the device can accurately determine the insulation resistance even in complex networks with high leakage capacitances (e.g., long cable runs, large motor windings, filtered systems).

• System Compatibility:

• Ungrounded AC systems (single-phase and three-phase).

• Ungrounded DC systems.

• Ungrounded AC systems with galvanically connected DC circuits (e.g., systems with rectifiers, thyristor-controlled DC drives, inverters).

• Response Values (Alarms): Features two separate, programmable alarm response values (Ran1 and Ran2).

• Ran1: Typically set as a pre-alarm to indicate a developing fault, allowing time for investigation and preventative action.

• Ran2: Set as the main alarm/trip value, indicating a critical insulation fault.

• Automatic Adaptation: The device automatically adapts to system leakage capacitance, ensuring accurate measurements even in systems with varying or high capacitance.

• Display and Operation:

• Includes an integrated LCD display for showing the current insulation resistance value, alarm thresholds, and other parameters.

• Buttons on the faceplate allow for setting of set-point values and other parameters, which are stored in a non-volatile memory (EEPROM).

• Outputs:

• Relay Contacts: Two separate alarm relays (change-over contacts) for signaling alarms (e.g., to an external alarm system, PLC, or SCADA).

• Measuring Instrument Output: Can have a current output (e.g., 0/4-20mA or 400µA) for connection to external measuring instruments (like the Bender SKMP) or control systems, allowing continuous monitoring of the insulation resistance value.

• Self-Test Function: Performs automatic self-tests during operation (e.g., every five minutes) to ensure its own functionality.

• Housing: Typically housed in a standard ABS plastic casing, suitable for DIN rail or screw mounting.

Product Parameters

(Note: These are general parameters derived from the IRDH265 series. Always refer to the specific BENDER IRDH265-4 datasheet for exact values and options, as slight variations can exist based on manufacturing revisions.)

• Monitored Nominal Voltage (Un):

• 3AC/AC: 0...690 V

• DC: 0...500 V

• Can be extended up to 6000V AC/DC with external coupling devices.

• Supply Voltage (Us): Typically AC 230V, 50/60 Hz (Operating range: 0.8 to 1.15 x Us). Other supply voltages may be available on request.

• Power Consumption: Typically 6.0 VA.

• Response Values (Ran1, Ran2): Programmable from 10 kΩ to 990 kΩ.

• Response Value Hysteresis: Programmable.

• Response Time: Approx. 6 seconds at RF = 0.5 x Ran and Ce = 1 µF (varies based on measuring principle and system conditions; can be < 1s for direct ground fault under asymmetric measurement).

• Max. Admissible System Leakage Capacitance (Ce): 150 µF (up to 500 µF with certain settings/conditions).

• Measuring Voltage (Um): 27 V.

• Measuring Current (Im): Max. 230 µA.

• Internal DC Resistance (Ri): 120 kΩ.

• Outputs:

• Alarm Relays: 2 change-over contacts, rated AC 250V, 5A.

• Measuring Output: 0/4...20mA (max. load 400 Ω) or 400 µA (max. load 12.5 kΩ), depending on configuration.

• Ambient Operating Temperature: -10 °C to +55 °C (Note: > 40°C may require attention to ventilation).

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

• Degree of Protection: Typically IP20 (for terminals) and IP54 or higher for the front face when correctly mounted in an enclosure.

• Standards Compliance: Complies with standards like DIN EN 61557-1 (VDE0413 part1):1998-05, IEC 61557-8, EN 61557-8, and ASTM F1669M-96.

Product Advantages

• Enhanced Electrical Safety: Crucially, it detects insulation faults early, preventing electrical shocks, fires, and equipment damage.

• High System Availability: In ungrounded (IT) systems, a first insulation fault does not immediately trip the system, allowing continuous operation while maintenance personnel are notified and can rectify the fault. This is vital for critical processes.

• Reliable Measurement (AMP): The Advanced Measuring Principle (AMP) provides accurate and reliable insulation resistance monitoring even in complex and noisy IT systems with high leakage capacitances and active rectifiers.

• Early Fault Detection: Enables proactive maintenance by providing early warnings of deteriorating insulation, allowing repairs before a critical failure occurs.

• Versatile Application: Suitable for a wide range of AC, DC, and mixed AC/DC ungrounded systems.

• User-Friendly: LCD display and intuitive buttons for easy configuration and status monitoring.

• Standard Compliance: Designed and certified to meet relevant international safety standards.

• Remote Monitoring: Relay contacts and analog output facilitate integration with SCADA, DCS, or building management systems for remote alarm signaling and data logging.

Precautions

• IT System Requirement: The IRDH265-4 is only for ungrounded (IT) systems. Do not use it in grounded (TN/TT) systems.

• Correct Installation: Adhere strictly to the BENDER installation manual. Ensure correct wiring, proper grounding, and appropriate isolation of the device during insulation and voltage tests of the system.

• System Voltage Compatibility: Verify that the rated voltage range of the IRDH265-4 matches the nominal voltage of the monitored IT system. For voltages exceeding the device's direct monitoring capability, use Bender's coupling devices.

• Supply Voltage: Ensure the supply voltage (Us) for the IRDH265-4 itself is within the specified operating range.

• Functional Test: It is highly recommended to perform a functional test after installation and before commissioning the IT system to ensure proper connection and operation of the IMD.

• Parameter Settings: Carefully set the response values (Ran1, Ran2) according to the specific safety requirements and acceptable insulation resistance levels for your application.

• Environmental Conditions: Install the device in an environment protected against dust, moisture, and extreme temperatures, within its specified operating range.

• Safety Regulations: All work on electrical systems must be carried out by qualified personnel, adhering to local and national electrical safety regulations.

• Unauthorized Access: Prevent unauthorized persons from accessing or contacting the A-ISOMETERs. Ensure warning signs are legible.

• One IMD per System: In an interconnected IT system, only one active A-ISOMETER should be connected. Multiple IMDs on the same IT system can interfere with each other's measurements.

Product Applications

The BENDER IRDH265-4 is indispensable in any application where an ungrounded (IT) electrical system is employed for safety, operational continuity, or fault location purposes.

• Hospitals and Healthcare Facilities:

• Operating Rooms (ORs), Intensive Care Units (ICUs), and other medical treatment areas where power continuity and patient safety are paramount.

• Data Centers:

• Ensuring continuous power supply to critical servers and networking equipment, preventing costly downtime due to electrical faults.

• Industrial Automation and Control Systems:

• Monitoring control power circuits in factories, processing plants, and automation lines to prevent unexpected shutdowns.

• Renewable Energy Systems:

• Monitoring insulation in photovoltaic (solar) installations and wind turbines, particularly in DC link systems.

• Mining:

• Crucial for safety in underground mining operations where ungrounded systems are often used for enhanced protection against electric shock.

• Marine and Offshore Applications:

• Ensuring electrical safety and reliability on ships, oil rigs, and other offshore installations.

• Transportation:

• Used in railway systems, electric vehicles, and charging infrastructure to monitor insulation.

• Chemical and Petrochemical Plants:

• Maintaining operational safety and preventing explosions in hazardous areas.

Payment: Bank of Chicago, Bank of Singapore

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

Service: Professional Sales provides 24 hours /7 days online service

Related products:

E-mail: alex@fenoux.com

Tel.: +86 13338369201

Skype: +86  13338369201

WhatsApp: +86  13338369201