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BENDER GmbH & Co KG
ISOMETER® IRDH275BM-7

ISOMETER® IRDH275BM-7

Product catalog summary

Device Overview
The ISOMETER® IRDH275BM-7, combined with coupling devices AGH675-7 and AGH675-7MV15, is designed for insulation monitoring in unearthed AC, AC/DC, and DC power systems (IT systems). It is suitable for medium voltage systems up to 15.5 kV and features the AMPPlus measurement method for modern power supplies.

Key Features

Insulation monitoring for systems with medium voltage converters up to 15.5 kV.
Two adjustable response values ranging from 100 kΩ to 10 MΩ.
Automatic adaptation to system leakage capacitance.
Real-time clock with history memory for alarm messages.
RS-485 BMS interface for communication with other Bender devices.
Self-monitoring with automatic alarm and self-test capabilities.
Remote parameter setting via Internet (optional).

Functionality
The device monitors insulation resistance and triggers alarms when resistance falls below set values. It features two alarm relays for prewarning and alarm distinction. The device can store fault messages and allows for testing and resetting via buttons.

Measurement Method
The patented AMPPlus method allows effective monitoring even with high system leakage capacitances and directly connected DC components.

Standards Compliance
The device complies with standards such as DIN EN 61557-8, IEC 61557-8, and others, ensuring reliability and safety.

Technical Specifications

Rated voltage: AC 800 V, impulse voltage: 8 kV.
Response values: 100 kΩ to 10 MΩ with a response time of ≤ 5 min.
Measuring voltage: ≤ 50 V, current: ≤ 21 μA.
Operating temperature: -10 to +55 °C.
Protection class: IP30 for internal components, IP20 for terminals.

Installation and Connection
The device supports various connection configurations and includes detailed wiring diagrams for proper installation. It requires specific cable types and lengths for optimal performance.

Environmental and Mechanical Conditions
The device is designed to withstand specific environmental and mechanical conditions, including shock and vibration resistance, as per IEC standards.

Ordering Information
Includes details on available models, cable lengths, and part numbers for ordering.

Catalog excerpts

Device combination for insulation monitoring in unearthed AC, AC/DC and DC power systems (IT systems)

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Device combination for insulation monitoring in unearthed AC, AC/DC and DC power systems (IT systems) ISOMETER® IRDH275BM-7 with coupling device AGH675-7 and AGH675-7MV15 Product description Device features • Insulation monitoring for drives including medium voltage converters up to 15.5 kV • Two separately adjustable response values 100 kfi...10 Mfi • AMPPlus measurement method (European patent: EP 0 654 673 B1) • Automatic adaptation to the system leakage capacitance • Info button to display device settings and the system leakage capacitance • History memory with real-time clock to store alarm...

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AC/DC Operating elements 1 - "INFO" button: to query standard information back (menu function), to confirm parameter change 2 - "TEST" button: to call up the self test. Arrow up button: parameter change, to move up in the menu 3 - Two-line display for standard and menu mode 4 - "RESET" button: to delete stored insulation fault alarms parameter change, to move down in the menu 5 - "MENU" button: to call up the menu system. Enter button: to confirm parameter change insulation fault, first warning level reached. insulation fault, second warning level reached. 8 - System fault LED lights: IRDH275...

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Wiring diagram - mains connection/example for UL and CSA applications, it is mandatory to use 5 A fuses. 2,3 - Terminals L1, L2 are not connected! 4 - Connection to the coupling device AGH675S-7 or the two Connect terminal AK to terminal(s) 5 of the coupling device AGH675S-7 (or the two coupling devices AGH675S-7MV15), Connection with standard low-voltage cable, maximum voltage at terminal 5: 200 V 6 - Separate connection of the terminals 3 and 4 of the 7 - External TEST button (NO contact) 8 - External RESET button (NC contact or wire jumper), when the terminals are open, the fault message will...

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Technical data IRDH275BM-7 Insulation coordination acc. to IEC 60664-1 Rated voltage Rated impulse voltage/pollution degree Voltage ranges Nominal voltage range Un Supply voltage US (also see nameplate) Frequency range US Supply voltage US (also see nameplate) Power consumption Response values Response value Ran1 (Alarm 1) Response value Ran2 (Alarm 2) Relative percentage error 100…500 kΩ Relative percentage error 500 kΩ…10 MΩ Response time tan Hysteresis Measuring circuit Measuring voltage Um Measuring current Im (at RF = 0 Ω) Internal DC resistance Ri Internal impedance Zi, at 50 Hz Permissible...

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Rated insulation voltage AGH675S-7MV15 Rated insulation voltage Type test: Voltage impulse test (basic insulation) AC voltage test (basic insulation) Partial discharge test Voltage impulse test (basic insulation) AC voltage test (basic insulation) Partial discharge test Routine test: Operating temperature (normal operation) - 10...+60 °C AC 7 2 k V Operating temperature (continuous operation with asymetrical earth fault - 10.+ 55 °C Classification of climatic conditions acc. to IEC 60721 AC 15.5 k V Stationary use (IEC 60721-3-3) 3K5 (no condensation, no formation of ice) Classification of mechanical...

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ISOMETER® IRDH275BM-7

ISOMETER® IRDH275BM-7

Catalog excerpts

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