GIS Webinar Series:

How to Perform Diagnostic Measurements on GIS Safely and Successfully

  • September 12 – PD Measurement on Gas Insulated Switchgear (GIS) (Qualified for 2 PDUs by Professional Engineers Board (PEB) of Singapore)
  • September 19 – Testing of HV / MV GIS Circuit Breakers (Qualified for 1 PDU by Professional Engineers Board (PEB) of Singapore)
  • September 26 – Accuracy Testing of GIS Current and Voltage Transformers (Qualified for 1 PDU by Professional Engineers Board (PEB) of Singapore)


Gas Insulated Switchgear (GIS) are completely sealed switchgears for HV / MV application. The advantages of GIS, which make it attractive for utilities, are that several components – switchgear, CT/VT, disconnector & earthing switch, busbar – are integrated in one enclosure and requires much less space than conventional air-insulated substation.

In addition, they have been constructed to be maintenance free during their projected service life (around 35-50 years). However, according to the fault statistics from CIGRE, IEC's target of having less than 0.001 faults / year has not been achieved yet.

Source: CIGRE TF 23-102, 1998

To ensure that all GIS components functions satisfactorily as per its design criteria and has safe operation, testing / monitoring needs to be performed on each of these assets either continuously or intermittently depending on their criticality.

Due to its compact design, the accessibility for performing diagnostic measurements safely is also challenging. In our upcoming webinar series, we would like to discuss with you these diagnostic requirements, associated challenges, and ways to successfully perform testing under these considerations.



12/09/2023 (GMT +8)

14:30 - 16:30

(2 hours)

PD Measurement on Gas Insulated Switchgear (GIS)


Insulation integrity in GIS can be tested via tests like Induced voltage withstand and Partial discharge (PD) tests. Typical insulation defects in GIS can be:


  • Moving particles
  • Fixed particles on insulation
  • Protrusions
  • Voids in insulators
  • Poor contact / Floating electrode

Source: CIGRE TB-662-2016-2


In this session, we will discuss the theory of UHF measurements on Gas Insulated Switchgear (GIS), focusing on measurement circuits and testing methodology. Case study will also be presented at the end of the session.


  • Introduction of GIS
    • Challenges associated with its testing
  • PD measurement on GIS
    • Using UHF sensor
  • Case Study: Induced voltage withstand testing of E/HV GIS
  • Questions & Answers


19/09/2023 (GMT +8)

14:30 - 16:15

(1 hour

45 mins)

Testing of HV / MV GIS Circuit Breakers


This session provides an overview of possible test methods to test the HV / MV circuit breaker in a GIS with CIBANO 500, including a practical demonstration on a MV circuit breaker (/GIS).


  • Safety factors required for on-site GIS breaker testing
  • Testing Methodology & evaluation criteria for HV/MV GIS breakers
  • Demonstration:
    • Performing measurements on MV GIS 
  • Questions & Answers


26/09/2023 (GMT +8)

14:30 - 16:00

(1.5 hours)

Accuracy Testing of GIS Current and Voltage Transformers


In this session, we will discuss the theory and method of performing accuracy testing on GIS current and voltage transformers using CT Analyzer and VOTANO 100, including case studies.


  • Accuracy testing of GIS CT/VTs
  • Tips & Tricks for field testing
  • Case Study
  • Questions & Answers




Key Speakers


Medium of instruction


Registration fee
Free of charge


Mode of delivery
This session will be delivered online by Cisco Webex Software. Upon successful registration, you will receive the information by email and will be able to join this online session with your desktop computer, tablet or mobile phone.

Please feel free to email for enquiries.

*The event program and list of speakers are subject to change without prior notice.