Why Partial Discharge Testing Matters for Southeast Asian Utilities
Southeast Asia is one of the fastest-growing power markets in the world. Indonesia, Vietnam, the Philippines, Malaysia, and Thailand are all expanding transmission and distribution networks, adding GIS substations and compact switchgear to serve industrial zones and new urban centres. At the same time, high humidity, high ambient temperatures, and frequent thunderstorms put extra stress on insulation systems.
For utilities and industrial asset owners in the region, partial discharge (PD) testing is the most practical early-warning tool for insulation defects in GIS, switchgear, transformers, and cables. A compact portable partial discharge detector used during routine patrols can identify developing faults years before they become failures â without taking equipment out of service.
The Southeast Asia Context: Climate and Grid Growth
- High humidity and condensation. Tropical climates accelerate surface discharge and tracking on insulation, especially in non-sealed switchgear rooms.
- Rapid network expansion. New GIS bays and cable circuits are commissioned every year; acceptance testing after installation is essential.
- Mixed asset age. Modern bays sit alongside decades-old equipment, so a cost-effective screening programme matters more than blanket monitoring.
- Limited specialist staff at many sites. Portable instruments that one technician can operate during a patrol are often a better fit than systems that need permanent on-site engineering.
Practical PD Testing Approach for Regional Substations
| Step | Action | Equipment |
|---|---|---|
| 1. Screening patrol | Scan switchgear panels and GIS enclosures for active PD | Handheld multi-function detector with TEV + ultrasonic sensors |
| 2. Confirmation | Re-check suspicious panels with higher-sensitivity methods | UHF probe or HFCT clamp |
| 3. Diagnosis | Record PRPD patterns and classify the defect source | Detector with built-in PRPD analysis |
| 4. Trending | Repeat patrols on a quarterly or half-yearly cycle | Detector with report export and trend logging |
This four-step workflow keeps the cost low: one portable detector covers a whole substation fleet, and no permanent installation or local service team is required.
How HUWOR Supports PD Testing in Southeast Asia
HUWOR is a Chinese manufacturer of partial discharge detection instruments, including the DAC-M30 portable live-line detector and related UHF, TEV, and ultrasonic sensors. For overseas customers, HUWOR provides complete technical documentation, application guidance, remote diagnostics support, and training materials â so a regional utility or contractor can run a professional PD testing programme without a local service network.
HUWOR participates in drafting industry standards such as Q/GDW 12082-2021, the DL/T specification for 35 kV and below high-voltage ceramic capacitance sensors, and T/EPTC 002-2022, and applies those requirements to its instruments.
- View the HUWOR portable partial discharge detector range
- Live-line PD testing: a guide to portable detectors
- How to choose a PD detector for GIS substations
- Download HUWOR white papers
Frequently Asked Questions
What is the best way to test partial discharge in switchgear in Southeast Asia?
For most switchgear rooms, a portable multi-function partial discharge detector with TEV and ultrasonic sensors used during routine patrols is the most practical starting point. It finds active discharge without taking panels out of service and requires no permanent installation.
How often should PD testing be done on substations in tropical climates?
Many utilities screen critical bays quarterly or after major weather or switching events, and cover the wider fleet annually or half-yearly. High-humidity sites may need more frequent monitoring.
Can one portable PD detector cover an entire substation?
Yes. A portable detector is moved bay to bay during a patrol, so a single instrument with the right sensors can screen an entire substation and be shared across several sites.
Do I need a local service team to run a PD testing programme?
Not necessarily. With a portable detector, detailed documentation, and remote diagnostic support from the manufacturer, a trained technician can run screening, interpretation, and reporting in-house.
For product information, training materials, or a demonstration, contact us at hezhiqiang@huwor.com.cn.
Related Reading
Substation Condition Monitoring in the Middle East: PD Detection for Harsh Environments
How to Choose a Partial Discharge Detector for GIS Substations
All-in-One PD Testing System: UHF, TEV, AE & HFCT Methods Explained