These protections of Intelligent Dielectric Loss Tester ensure human safety 
Darui Electric recommends：
IntelligentDielectric Loss TesterUses frequency conversion anti-interference and Fourier transform digital filtering technology, fully automatic intelligent measurement, with very stable measurement data under strong interference. Measurement results are displayed on a large LCD screen, with a built-in micro printer for printout.
 
　　Features
 
　　1. Convenient Operation. Simple wiring and automatic testing make operation very easy.
 
　　2. Strong Anti-Interference Capability. Both the measurement system and high-voltage system have dual anti-interference capability to eliminate interference, making it very suitable for on-site use.
 
　　3. Safe Operation. All operations are at ground potential with no overvoltage risk.
 
　　4. High Precision. Features high resolution and accuracy, can test the dielectric loss factor of insulating oil, and can measure within the 45~65Hz signal range.
 
　　Multi-Level Safety Protection Ensuring Personal and Equipment Safety
 
　　1. High-Voltage Protection: Short circuit, breakdown, or high-voltage current fluctuation of the test sample is cut off at high speed via short-circuit mode.
 
　　2. Low-Voltage Protection: Protection is activated in case of incorrect 380V connection, power fluctuation, or sudden power failure, preventing overvoltage.
 
　　3. Grounding Protection: Grounding protection is activated when poor instrument grounding causes dangerous voltage on the enclosure.
 
　　4. C  V  T: Four protection limits for high-voltage voltage and current, and low-voltage voltage and current prevent equipment damage; incorrect menu selection will not output excitation voltage. No 10kV high-voltage output during CVT measurement.
 
　　5. Anti-Misoperation: Two-stage power switch; real-time voltage and current monitoring; multiple key confirmations; clear high/low voltage terminal distinction; slow voltage ramp-up with rapid voltage reduction, audible and visual alarms.
 
　　6. Anti-“Voltage Rise”: When measuring large-capacity test samples, a “voltage rise” effect occurs; the instrument automatically tracks the output voltage to maintain constant test voltage.
 
　　7. Shock Resistance: The instrument uses a unique shock-resistant design that withstands strong vibrations and jolts during long-distance transportation without damage.
 
　　8. High-Voltage Cable: Uses high-voltage resistant insulated conductors that can be dragged on the ground.

Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.