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How to Slove Partial Discharge


Partial Discharge is a local electrical discharge that occurs within the insulation system. It is the result of high electric field stress. This can lead to the destruction of the insulating material. Partial discharges can occur in many types of electrical equipment, such as transformers, cables, and motors. Partial discharge monitoring and detection is critical to ensuring the reliability and safety of these systems.

ประเภทของ Partial discharge

    1. Corona Discharge: The most common form of partial discharge. This occurs when a direct discharge into the air emanates from the sharp surface of the conductor. This is what causes sound and radio frequency emissions.
    2. Arcing Discharge : An arc discharge is a long-term electrical discharge caused by the electrical decomposition of a gas.
    3. Surface Discharge : When the discharge travels along the surface of the insulator. This is called surface discharge. or surface tracking It is one of the causes of Pratial discharge that causes the most damage. Contamination and weathering of insulating surfaces are two of the most common causes of surface discharge in medium and high voltage equipment. This type of discharge occurs when the insulation breaks. This is usually caused by high humidity or poor maintenance.
    4. Void (internal) Discharge: Most commonly caused by defects in the solid insulation of cables and bushings, insulating connections, GIS, etc. Void (internal) discharges are extremely damaging to the insulation and generally expand. The next one until it causes damage to the point where it can’t be used anymore.

Signal characteristics of Partial discharge

Amplitude : Partial discharge signals generally have a low amplitude. This usually ranges from a few millivolts to a few hundred millivolts, however the amplitude can vary depending on the severity of the discharge.

You can protect Before there is a problem of partial discharge, you can use ultrasonic tools to check with sound. Before the electricity break out the insulation Until the problem of discharging

How to prevent partial discharge

In general, surface discharge and void discharge are things that should be prioritized for inspection. and quickly fix it for jobs related to industrial high voltage, system technicians, power transmission engineers Original Equipment Manufacturer (OEM) Electrical Engineer In many cases, detecting and correcting partial discharge is a safety priority. In addition to personal safety, other damages can occur such as: Breakdown of machinery, Fire, Deterioration of insulators, Grid overload.
These problems can be avoided if caught early. before serious damage occurs Currently, there are many methods for detecting partial discard. They can be detected using ultrasound, radio waves (RF), and ultraviolet radiation. Faadtech is pleased to offer equipment that helps make the job easier, including Ultrasonic leak detection / Sonaphone machines. And many more. How to use it. and organizing training for use In order to use it correctly and most effective

1. Regular inspections: Conduct regular inspections to identify signs of partial discharge, such as abnormal noises. abnormal heat or the smell of ozone
2. Quality control: Ensure high quality insulating materials and manufacturing processes to minimize the occurrence of defects that trigger partial discharge.
3. Voltage Optimization: Keep the voltage level within safe limits. To prevent excessive electrical stress on the insulation system.
4. Condition monitoring: Use a continuous monitoring system to detect partial discharge early. In order to be able to intervene and take preventive measures in a timely manner.
5. Periodic Maintenance: Clean and maintain electrical equipment regularly to reduce contamination that may trigger partial discharge.

Causes of partial discharge:

Several factors contribute to this occurrence of PD. Some of the main reasons include:

1. Voltage stress: Excessive voltage levels may cause the electric field strength to exceed the ability of the insulation to withstand, leading to partial discharge.
2. Insulation Defects: Inadequate Insulation: Voids, gas bubbles, or impurities within the insulating material can create weak points that are prone to partial discharge.
3. Age and deterioration: Over time The insulating material may deteriorate. Decreased ability to cope with electrical stress and increases the chance of partial discharge
4. Mechanical stress: Physical stress on the insulation, such as vibration or excessive pressure. May impair insulation integrity and promote partial discharge.

Tools to assist in the detection of partial discharge

   In conjunction with the SONAPHONE ultrasonic testing equipment, the SONOSPOT parabolic dish is used to detect hard-to-reach or distant damage. such as on power transmission and distribution lines. The high sensitivity and precise orientation of the sensor enable the detection of electrical partial discharges and insulation damage such as medium voltage electrical equipment (Medium-Voltage) or switchgear Increased tendency of partial discharge can lead to widespread damage in the insulators.

   Regular inspections of electrical equipment are essential for preventive maintenance. SONAPHONE devices can be used to detect and classify the severity of corona, tracking and arcing problems. For both high, medium and low voltage equipment to monitor open or closed electrical systems. To inspect switching cabinets, control boxes, relays, transformers, insulators, etc.

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PD Detection & PD Type Identification

   Partial discharges can be detected before more serious faults would occur, even before a thermal camera would detect them.

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