BENDER IRDH275BM-727

Technical Core Specifications

1. Matched Coupling Device Support: AGH675S-7 / AGH675S-7MV15 medium voltage voltage divider coupling units
2. Extended Monitored System Voltage Range: Up to 15.5 kV AC/DC via external coupling accessory
3. Insulation Resistance Alarm Threshold Range: 100 kΩ ~ 10 MΩ two independent adjustable response values
4. Auxiliary Power Supply: AC 100–240 V / DC 100–240 V universal input, power consumption ≤9 W
5. Communication & Signal Outputs
   • Galvanically isolated RS-485 BMS communication bus
   • Isolated 0(4)–20 mA analog insulation resistance retransmission output
   • Two SPDT fault alarm relays (10 A / 250 V AC contact rating)
6. Environmental & Mechanical Parameters
   • Operating temperature range: −20 °C ~ +60 °C
   • Protection grade: IP20 DIN rail cabinet installation
   • Compliance certification: IEC 61557-8, VDE 0413-8, UL, CE

Functional Features

1. Optimized AMP Plus measurement algorithm specially for medium-voltage converter high leakage capacitance load environment
2. Real-time system leakage capacitance display function, judging medium-voltage cable insulation aging trend through capacitance change
3. Large-capacity historical event memory with real-time clock, record insulation fault, self-test and communication abnormal events
4. Support multi-unit parallel linkage monitoring of multiple interconnected medium-voltage IT power systems without measurement cross-interference
5. External remote test/reset terminal reserved for centralized control cabinet remote fault reset
6. Continuous hardware self-monitoring for measuring circuit, coupling device connection and internal power supply
7. Front panel backlit LC display supports multi-language parameter menu configuration

Working Principle

Material & Structural Composition

• Main unit enclosure: Flame retardant reinforced plastic DIN rail cabinet shell with transparent front protective window
• Internal measuring circuit: High-voltage isolation operational amplifier, surge suppression high-voltage capacitor array, industrial-grade DSP signal processing chip
• Human-machine interface: Backlit LC display, sealed dust-proof membrane operation buttons
• Output execution components: Silver cadmium alloy high-reliability electromagnetic alarm relays

Advantage Highlights

1. Exclusive matching medium voltage coupling device realizes safe monitoring of 15.5 kV unearthed power systems without direct high voltage connection to main unit
2. Support multi-medium-voltage IT interconnected parallel system synchronous monitoring, suitable for large wind farm medium voltage power grid
3. Strong anti-interference performance adapts to complex electromagnetic environment of medium voltage frequency converter rooms
4. Complete digital and analog dual signal output meets medium voltage substation SCADA system remote monitoring requirements
5. Long service life industrial relay contacts adapt to frequent alarm output of wind power medium voltage equipment

Applicable Industries

Installation Mandatory Requirements

1. Main unit must install in low-voltage control cabinet, medium voltage coupling device AGH675S must mount separately inside medium voltage switchgear room
2. Connect dedicated shielded measuring cable between main unit and coupling device, maximum cable length limited to 50 m
3. Auxiliary power supply input must install 10 A slow blow anti-short-circuit fuse
4. Medium voltage coupling device must reliably connect to system protective earth bus with 10 mm² copper ground wire

Operation & Maintenance Precautions

1. Every 6 months perform full system self-test including main unit and external coupling device linkage detection
2. Every 12 months inspect insulation resistance of connecting measuring cable between main unit and coupling accessory
3. Forbid disassemble internal measuring circuit of AGH675S medium voltage coupling device without professional training
4. When insulation resistance continuous decline trend appears, arrange medium voltage cable partial discharge inspection immediately