The portable partial discharge detector is mainly applicable for the insulation status detection of medium and high voltage (typically 3kV and above) electrical equipment.
I. Types of Electrical Equipment Suitable for Detection
Power cables and accessories
Cable body: XLPE cables, high-voltage cross-linked cables, etc. Detect air gaps, impurities or water tree discharges in the insulation layer.
Cable joints: Intermediate joints, terminal heads (indoor/outdoor), these parts are prone to faults and can detect discharges caused by poor installation process, stress cone misalignment, moisture, etc.
Application scenarios: Cable completion acceptance, preventive tests, verification after fault location, operation status inspection.
Switch cabinets and distribution equipment
High-voltage switch cabinets: Detect insulation defects of internal components (such as circuit breakers, disconnectors, busbars, current transformers, voltage transformers), local discharge inside the cabinet is the main cause of insulation breakdown and inter-phase short circuits.
Ring main units: As key equipment in the distribution network, regular detection of internal discharge is required.
Box-type substations: Implement comprehensive detection of transformers and switch equipment integrated in the box. Power transformer
Dry-type transformers: Inspect inter-turn and inter-layer insulation of windings, internal defects of epoxy resin castings, and lead wire discharges.
Oil-immersed transformers: Generally used as external auxiliary detection methods, combined with oil chromatography analysis, to detect discharges in components such as bushings, oil reservoirs, and high-voltage leads.
Gas-insulated switchgear (GIS) / Gas-insulated switchgear and lamp (GIL)
GIS / GIL: Detect internal conductor burrs, floating potentials, insulator surface dirt or cracks, metal particles, etc., which are important means for daily inspection and condition monitoring of such equipment.
Rotating machines
High-voltage generators, large motors: Inspect problems such as slot discharges, end discharges, insulation aging of stator windings of the equipment.
Other high-voltage equipment
High-voltage bushings, insulators, lightning arresters, capacitors, transformers, etc.
II. Main application fields
Power system operation and maintenance
Carry out regular inspections and condition assessments of equipment in substations, switchgear stations, and distribution lines, promoting the transformation of maintenance mode from “scheduled maintenance” to “condition-based maintenance”.
Carry out condition monitoring of factory-owned high-voltage electrical equipment and generators to ensure the safe and stable operation of the power generation system.
Industrial sector
Suitable for enterprises with their own substations and a large number of high-voltage motors and cables in industries such as metallurgy, chemical engineering, mining, rail transit, and data centers, to ensure continuous power supply and avoid production halts due to electrical faults.
Engineering construction and installation acceptance
Carry out partial discharge tests before commissioning after new equipment installation or major repairs to ensure qualified installation quality and prevent equipment from being put into operation with hidden problems.
Used for equipment factory tests, quality inspections, and to enhance the overall reliability of products.
Third-party testing and technical services
Provide professional equipment condition assessment, fault diagnosis, and technical consulting services for customers.
Research and education
Used for insulation material research, fault mechanism analysis, and detection technology development in teaching and research activities.
III. Typical application scenarios
Preventive inspection: Conduct regular “physical examinations” of equipment, establish baseline discharge signals, and track the development trend of discharge signals.
Fault diagnosis and location: When equipment shows abnormalities (such as abnormal sounds, temperature rise, abnormal chromatographic data), quickly locate the discharge location and type to provide guidance for maintenance work.
Acceptance and pre-commissioning testing: Ensure good insulation status of newly commissioned or re-commissioned equipment.
Online monitoring assistance and verification: As a supplement and verification means to fixed online monitoring systems, conduct repeated tests and precise diagnosis.
Emergency repair support: Assist in determining the nature and scope of faults after a failure occurs.
Post time: Jan-13-2026