How to monitor transformer local discharge? Professional Local Discharge System Manufacturer

Date: February 5, 2026 11:30:27

As the capacity of the grid continues to increase, the transformer has been in a state of high load operation for a long time, thePartial Discharge (PD) It has become one of the main hidden dangers that trigger insulation aging, breakdown and even accidental shutdown.
So.How to monitor transformer local discharges? How to choose a reliable manufacturer of Local Discharge Systems?

I. What is transformer partial discharge? Why must online monitoring?

Transformer partial discharge refers to the phenomenon of tiny discharges occurring in the localized area of the insulation system, which is commonly found in:

  • Winding insulation aging
  • Oil paper insulation defects
  • Presence of air gaps, cracks or impurities
  • Abnormal core grounding

Low initial energy and stealthy nature of the localized release.Traditional outage tests are difficult to detect in time.. Once accumulated over time, it is highly susceptible to evolve:

  • dielectric breakdown
  • Equipment tripping
  • Major electrical accidents

Therefore.Deployment of transformer local line monitoring system for real-time, continuous monitoring, has become a core tool for intelligent operation and maintenance of substations.

Second, how to monitor the transformer local discharge? Mainstream monitoring technology analysis

Professional transformer localized discharge monitoring, typically usingMulti-sensor fusion online monitoring technology, which consists of the following three main approaches:

1️⃣ Ultrasonic Local Discharge Monitoring

  • Attachment to the tank surface by means of ultrasonic sensors
  • Acquisition of acoustic signals generated by local amplifiers
  • Suitable for determining the location of local discharges and the degree of discharge activity

2️⃣ High Frequency Current Local Discharge Monitoring (HFCT)

  • Installation of high-frequency current sensors on transformer core grounding wires
  • Monitoring of high-frequency pulse currents generated by local discharges
  • Strong anti-interference ability, suitable for online long-term monitoring

3️⃣ UHF Local Emission Monitoring (UHF)

  • Extension of the UHF sensor into the insulating oil through the oil valve
  • Monitoring 300MHz-3000MHz electromagnetic signals
  • Extremely sensitive to internal insulation defects with high accuracy

✅ Multiple sensors working togetherThe accuracy and reliability of localized discharge detection can be significantly improved.

Third, the transformer local line monitoring system working principle

A professional local amplification system usually consists of the following components:

  • Local discharge online monitoring device receiving main unit
  • Ultrasonic / High Frequency Current / UHF Local Discharge Transducers
  • Partial Discharge Online Monitoring Software Platform

The system operation flow is as follows:

  1. Sensor real-time acquisition of transformer local discharge signals
  2. Filtering, amplification and high-speed sampling of signals by the monitoring host computer
  3. The system automatically calculates parameters such as discharge amplitude, number of discharges, phase, etc.
  4. software is based on 3D PRPD / PRPS mapping Visualize the state of localization
  5. Automatically triggers alarms and warning alerts when data is abnormal

Realization of transformersAll-weather, all-life-cycle securityThe

IV. What capabilities should a manufacturer of a quality local-amplifier system have?

Choose a professionalManufacturer of Transformer Local Discharge Systems, should focus on the following points:

✅ Self-developed and multi-channel high-speed acquisition capability

  • Supports 4 / 6 channel acquisition
  • Sampling rates up to 200 MS/s
  • Accurate capture of weak localized signals

✅ Strong anti-interference design

  • dynamic range -80 to -20 dBm
  • Adaptation to the complex electromagnetic environment of the substation

✅ Specialized graphical analysis and intelligent diagnostics

  • Supports PRPD, PRPS 3D mapping
  • Localization type identification in conjunction with expert databases

✅ Industrial-grade reliability

  • Sensor protection class IP68
  • Suitable for outdoor, harsh conditions and long-term operation

V. Inotera: Professional Transformer Local Line Monitoring System Manufacturer

As a manufacturer specializing in online monitoring of power equipmentInnoTech Offer complete:

  • Transformer partial discharge online monitoring system
  • Local Discharge Sensor (Ultrasonic / HF Current / UHF)
  • Back-office monitoring and analysis software

The products are widely used:

  • (transformer) substation
  • industrial and mining enterprises
  • New Energy Stations
  • Grid Intelligent Operation and Maintenance Project

be in favor of Solution customization, system integration, remote monitoring and data uploadingIt helps users to detect hidden problems in advance and reduce operation and maintenance costs.

VI. Localized on-line monitoring for safer transformers

How are transformer local discharges monitored?
Through a professionalLocal Line Monitoring System + Multi-sensor Fusion Technology + Intelligent Mapping AnalysisIn order to truly achieve early detection, early warning and early treatment.

Choose an experienced and skilledLocal Discharge System (LDS) manufacturer, is a critical step in ensuring the safe operation of power equipment.

👉 For detailed technical information or manufacturer's price, welcome to contact the professional team of InnoTech for consultation.