OEM Best testing of instrument transformer Factories – Partial Discharge Online Monitoring System of GIS – HV Hipot

OEM Best testing of instrument transformer Factories – Partial Discharge Online Monitoring System of GIS – HV Hipot

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OEM Best testing of instrument transformer Factories – Partial Discharge Online Monitoring System of GIS – HV Hipot Detail:

General Information

Gas-insulated metal-enclosed switches (GIS) and gas-insulated metal-enclosed transmission lines (GIL) are one of the most important devices in the power system. They have the dual tasks of control and protection. If they failed during operation and the problem cannot be solved timely,it will cause serious damage to the grid. Partial discharge fault is a common fault type of GIL/GIS. It is necessary to use GIS partial discharge online monitoring and fault location system to perform real-time online monitoring of GIL/GIS partial discharge signals and analyze and process the measured data and real time give comprehensive judgment of insulation status. Then repair schedule can be arranged according to the monitoring results to avoid major grid accidents caused by equipment failure and to ensure the normal operation of the system with minimum maintenance cost.

There are many reasons for the deterioration of the dielectric medium, such as ionization corrosion caused by a strong electric field for a long time, insulation wear caused by mechanical high-frequency vibration, aging decomposition of the medium caused by thermal effects, and moisture insulation. The dielectric medium is degraded, and the performance is degraded so that the dielectric breakdown has a development process, which makes the on-line monitoring of insulation practical and effective. The system uses Smart Quick software developed totally by HVHIPOT. It uses advanced high-speed DSP digital processing technology and software. The processing technology makes our monitoring system fast and accurate, which is the most economical and reliable solution for the online monitoring system of GIS.

Monitoring Principle

Through installing UHF sensor on the key components of GIL/GIS, to collect 500MHz-1500MHz electromagnetic wave signal excited by the partial discharge of GIL/GIS in real time. It also collects feature quantities such as amplitude (Q), phase (Φ), frequency (N), and cycle sequence (t) of the partial discharge pulse signal that reaches the trigger condition by detection frequency reduction circuit, high speed sampling circuit and data processing buffer circuit. Event files are generated and uploaded to upper computer expert diagnosis system, to perform event map establishment and monitoring equipment insulation state analysis. 

Partial Discharge Online Monitoring System of GIS01

UHF PD measurement principle

Install the UHF sensor on the busbar part or GIL. The sensor measurement principle diagram is shown in the above figure. The sensor installation is divided into built-in and external modes. Multiple sensors can be installed on one GIS interval or the whole GIL to achieve effective monitoring of different parts. Anoise sensor is required to acquire the background noise and compare it as a background signal during data analysis.

The installation principle of the UHF partial discharge sensor for GIL is the same as that of the GIS and is arranged according to the distance characteristics of the PD signal propagation. The built-in sensor is installed in the pre-installed way of GIL/GIS production. The sensor arrangement should ensure that the partial discharge occurring at any position inside GIL/GIS can be effectively detected. Under this premise, the sensor should be installed in key components of GIL/GIS, including circuit breakers, disconnectors, voltage transformers, busbars, etc.


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OEM Best testing of instrument transformer Factories –  Partial Discharge Online Monitoring System of GIS – HV Hipot detail pictures


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The consumer fulfillment is our primary goal. We uphold a consistent level of professionalism, top quality, credibility and service for OEM Best testing of instrument transformer Factories – Partial Discharge Online Monitoring System of GIS – HV Hipot , The product will supply to all over the world, such as: Munich, Mumbai, Slovakia, We have a excellent team supplying professional service, prompt reply, timely delivery, excellent quality and best price to our customers. Satisfaction and good credit to every customer is our priority. We are sincerely looking forward to cooperate with customers all over the world. We believe we can satisfy with you. We also warmly welcome customers to visit our company and purchase our products.
  • In China, we have many partners, this company is the most satisfying to us, reliable quality and good credit, it is worth appreciation.
    5 Stars By Karl from Tunisia - 2018.11.06 10:04
    Although we are a small company, we are also respected. Reliable quality, sincere service and good credit, we are honored to be able to work with you!
    5 Stars By Camille from Grenada - 2017.03.07 13:42

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