By hvhipot 
In the operation of the power system, we often encounter various problems, among which “partial discharge” is definitely a tricky “invisible killer”. Although it is small, its long-term existence can cause irreversible damage to power equipment and even trigger safety accidents. What exactly is partial discharge? How can we ‘uncover’ it? Today, let’s talk about the key “detective” of partial discharge detection device.
What is partial discharge?
Simply put, partial discharge refers to the phenomenon of partial and discontinuous discharge that occurs in a local area with uneven voltage gradient in the insulation medium of electrical equipment. It is like small wounds on insulating materials, which produce weak corona discharge under the stimulation of voltage. Although these discharges are initially weak, they will continuously erode the insulation material, causing its performance to gradually decline and ultimately leading to equipment breakdown.
Factors affecting partial discharge
It is crucial to understand the influencing factors of partial discharge in order to effectively detect and prevent it. These factors include:
Aging and damage of insulation materials: Long term operation and environmental factors (such as humidity and temperature changes) can cause insulation materials to age, produce cracks or air gaps, and become a breeding ground for partial discharge.
Defects in equipment structure design: sharp corners of conductors, metal burrs, uneven electrode gaps, etc., can all cause excessive local electric field strength and trigger discharge.
External carrier voltage: especially lightning impulse voltage or operational impulse voltage, they will instantly increase the electric field strength inside the equipment, making it easier to trigger partial discharge.
Operating environment: External environmental factors such as pollution, humidity, and vibration can also have adverse effects on insulation performance.
Detective tool: Partial discharge detection device
To ‘uncover’ this’ invisible killer ‘, we cannot do without professional’ detectives’ – partial discharge detection devices. These devices capture and analyze various signals generated by partial discharge through different principles:
Pulse current method: detects the weak pulse current generated by partial discharge.
Acoustic method: Partial discharge generates ultrasonic waves, which are received and analyzed to determine the discharge situation.
Electromagnetic wave method: Capturing electromagnetic wave signals generated by partial discharge.
Optical method: directly observing the glow generated by discharge through optical equipment.
These devices can monitor the operating status of the equipment in real time, and once any abnormalities are detected, they can issue alerts in a timely manner, buying valuable time for equipment maintenance. HV Hipot Electric Co., Ltd. has a profound technical accumulation in this field, and its developed equipment plays an important role in the safe operation of the power system.
Application and Optimization of Partial Discharge Detection
Partial discharge detection is not only about “discovering problems”, but also the key to “preventing problems”. It is widely used in:
High voltage transformer: Monitor the aging of insulation oil and insulation paper.
Cable: Check for defects in the insulation layer of the cable.
Switchgear: Evaluate the integrity of insulation components.
Generator and motor: Check the health condition of the winding insulation.
To do a good job in partial discharge detection, we need to:
Choose the appropriate detection method: Based on the type and operating environment of the device being tested, select the most effective detection technology.
Regular maintenance and calibration: Ensure the accuracy and reliability of the detection device.
Data analysis and trend prediction: It is not only necessary to detect the current discharge situation, but also to predict future development trends through historical data analysis and take preventive measures in advance.
HV Hipot Electric Co., Ltd. has been committed to providing efficient and reliable partial discharge detection solutions to help users better ensure the safe and stable operation of the power system.
Frequently Asked Questions (FAQ)
Q1: Will partial discharge necessarily cause equipment damage? A1: Partial discharge is a potential threat, although it may not immediately cause equipment damage, long-term existence can accelerate insulation aging and increase the risk of equipment failure.
Q2: Which devices are most prone to partial discharge? A2: High voltage electrical equipment, especially equipment that has been running for a long time and may have aging insulation materials, such as transformers, cables, switches, etc.
Q3: What is the relationship between partial discharge and insulation breakdown? A3: Partial discharge is one of the early signs of insulation breakdown. If not controlled, continuous partial discharge will gradually weaken the insulation strength, ultimately leading to insulation breakdown.
Q4: How can partial discharge be effectively prevented? A4: Maintaining a good operating environment, conducting regular equipment inspections and maintenance, using high-quality insulation materials, and considering them thoroughly in the design and manufacturing processes are effective ways to prevent partial discharge.
Q5: What is the approximate price of a partial discharge detection device? A5: The price of partial discharge detection device is affected by many factors, including the progressiveness of detection technology, functional complexity, brand, etc. It is recommended to directly consult relevant equipment suppliers, such as HV Hipot Electric Co., Ltd., for detailed quotations.