Bender isoEV425HC-D4-4+AGH420 Insulation Monitor + Adapter

Description

Bender isoEV425HC-D4-4+AGH420 Insulation Monitor + Adapter

Product Dimensions：

The Bender isoEV425HC-D4-4 combined with the AGH420 coupling device is a sophisticated insulation monitoring system specifically engineered for DC charging stations (EV charging) and high-voltage DC systems. It ensures electrical safety by continuously monitoring the insulation resistance between the DC conductors and the earth (ground).

Product Detailed Description

The isoEV425HC is the core monitoring device (ISOMETER®), while the AGH420 is an external high-voltage coupling module. Together, they allow for insulation monitoring in systems with high nominal voltages (up to 1000V DC) and high system leakage capacitances. This combination is essential for IT systems (unearthed systems) where the first insulation fault must be detected immediately to prevent hazardous situations.

Technical Parameters

Product Advantages

• Optimized for EV Charging: Specifically designed to handle the rapid voltage fluctuations and high-frequency interference common in DC fast-charging piles (CCS/CHAdeMO).
• Advanced Measurement Technology: Uses the patented AMP Plus measurement principle, which can accurately detect symmetrical and asymmetrical insulation faults even in systems with high harmonic content.
• Compact & Modular: The separate coupling device (AGH420) allows the low-voltage control electronics (isoEV425) to be safely isolated from the high-voltage DC bus.
• Predictive Maintenance: By providing a continuous reading of the insulation resistance (in kΩ), operators can identify degrading insulation before a total failure or short-circuit occurs.
• Self-Monitoring: The device constantly checks its own connection to the earth and the monitored system, triggering an alarm if a connection wire is broken.

Important Considerations (Precautions)

• High Voltage Safety: The AGH420 is connected directly to the 1000V DC bus. Installation must only be performed by qualified personnel while the system is de-energized.
• Single Device Rule: In an IT system, only one insulation monitoring device may be active at a time. Multiple devices will interfere with each other’s measurement pulses.
• Earthing Connection: The quality of the earth connection is critical. Ensure low-impedance grounding to prevent measurement errors.
• Parameter Settings: The response value (R_{an}) must be set according to local standards (e.g., IEC 61851-23) to ensure the charging station shuts down safely when a fault is detected.

Product Applications

• DC Fast Charging Stations (EVSE): Monitoring the insulation of the DC output to the vehicle to prevent electric shock to the user.
• Energy Storage Systems (ESS): Safeguarding large battery banks and their associated DC bus systems.
• Photovoltaic (PV) Systems: Monitoring high-voltage DC strings in utility-scale solar farms.
• Industrial DC Grids: Providing safety for unearthed DC distribution networks in manufacturing or maritime environments.

Shipping Port: Xiamen, China

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