GYID Insulation Monitor for AC and DC Floating Systems (0~1000VDC, 0~750VAC)

Description

The GYID insulation monitor for AC and DC floating systems monitors insulation resistance to ground in real time in 0~1000VDC floating DC systems and 0~750VAC floating AC systems. It detects insulation faults such as equipment housing-to-ground and high-voltage-to-housing insulation failures, and in DC systems it measures the positive and negative poles to ground independently.

Product description

GYID series insulation monitor is used for real-time monitoring of insulation resistance to ground in 0~1000VDC floating DC systems and 0~750VAC floating AC systems; it can detect insulation faults such as equipment housing-to-ground and high-voltage-to-housing insulation failures.

• In DC systems, it can independently measure the insulation resistance of the positive and negative poles of the DC system to ground. In electric vehicle applications, it can reliably monitor insulation resistance under strong interference or complex driving conditions, such as acceleration/deceleration, braking, and energy recovery.
• In AC systems, it can suppress interference from high-frequency voltage harmonics and accurately measure the insulation resistance to ground of the entire AC system.
• DC System: Monitors the insulation status to ground of 0~1000VDC floating DC systems and accurately measures DC voltage.
• AC System: Monitors the overall insulation status to ground of 0~750VAC floating AC systems. Line selection is not available (it cannot distinguish which phase line has an insulation fault), and AC voltage measurement is not supported.
• Passive Equipment: Monitors the insulation status between equipment and housing or between equipment and ground.

What can the GYID monitor, and what can it not do?

The GYID covers three situations with one product family: a floating DC system, a floating AC system, and passive equipment where insulation between the equipment and its housing or ground has to be checked. In a floating AC system it gives the overall insulation status of the system. It does not do line selection, so it cannot tell which phase conductor has the fault, and it does not measure AC voltage. If you need to locate the faulty branch on a DC system, see the GYDCG-MBC multi-branch DC insulation monitor.

GYID or a DC-only model?

• Choose the GYID when the same type of monitor must work on both DC and AC floating systems, or on passive equipment.
• For DC-only 100~1000VDC systems with a TUV-CE certified label, see the GYIM-DAR DC insulation monitor.
• For EV charging piles, see the GYDCG-UBCH1 multifunctional DC insulation monitor.

Frequently asked questions

What system voltages does the GYID cover?

0~1000VDC floating DC systems and 0~750VAC floating AC systems.

Can it tell which AC phase has the insulation fault?

No. Line selection is not available on AC systems; it monitors the overall insulation status of the AC system.

Does it measure AC voltage?

No. AC voltage measurement is not supported. In DC systems it measures DC voltage.

Can it be used on electric vehicles?

The documentation states it can monitor insulation resistance reliably under strong interference and complex driving conditions such as acceleration, deceleration, braking and energy recovery.

Related guide

• How does an insulation monitoring device work?

Technical support and certificates

Gongyuan (Suzhou Gongyuan Automation Technology Co., Ltd.) has focused on insulation monitoring since 2017 and operates a quality management system built to the ISO 9001:2015 standard. Send your system type, voltage and application through our contact page for a recommendation. Certificates and test reports are listed on the Certifications page. Specifications on this page come from Gongyuan’s product documentation; please confirm the final model and options with our engineers before ordering.