High Voltage Relay Test Guide


Electric Safety

High voltage relay (HV Relay) is broadly used in automatic circuit control functioning as safety protection or switching circuit. However, has the general user ever thought that the relay used for the switching circuit should be or must be in an isolated state? But then again, is the HV relay really completely isolated?
There are many conditions causing the relay to fail. The common problems are poor withstand voltage of Contact to Coil, increased contact resistance of the reed switch, increased coil resistance, and glass tube dark crack on reed switch. Among them, the poor withstand voltage of Contact to Coil could endanger the user’s safety and seriously affect the low-voltage digital control circuit. It is particularly important to use the relay with safety protection. This document explains the precautions of partial discharge (PD) detection and withstand voltage detection for HV relays during testing and production inspection.

  • Working Theory
  • Common Specifications
  • Deficiencies of Detecting Methods
  • Chroma Related Test Solutions
Chroma Test Solutions
Chroma 19501-K

Chroma 19501-K Partial Discharge Tester

Objective: Partial discharge test between relay contact and coil

Learn More
Video Showcase


More Chroma Test Solutions

Chroma 11890 Programmable HF AC Tester

Objective: Deterioration accelerated test to analyze the cause of partial discharge

Learn More

Chroma 16502 Milliohm Meter

Objective: Measurement of contact resistance

Learn More

Chroma 19056 Hipot Analyzer

Objective: Detection of the withstand voltage between relay contacts or between contact and coil

Learn More

Chroma 11210 Battery Cell Insulation Tester

Objective: Insulation resistance test between relay contacts or between contact and coil

Learn More