Have you ever thought about how large high-voltage equipment such as power transformers and mutual inductors ensure safe and stable operation? They are not like us who can directly see a doctor when we are sick, they often need to rely on professional 'physical examination tools'. Today, let's talk about one of the very important "physical examination doctors" - the high-voltage dielectric loss tester.
What is a high-voltage dielectric loss tester?
Simply put, it is an instrument used to test the insulation performance of high-voltage electrical equipment. Insulation material is the heart of electrical equipment, and if its "heart disease" cannot be detected, the consequences can be serious. The high-voltage dielectric loss tester evaluates the quality of insulation by measuring the energy loss of insulation materials under the action of an electric field. This type of loss is professionally referred to as' dielectric loss'.
What are the "behind the scenes" factors that affect dielectric loss?
The operating environment of the equipment, the quality of the materials themselves, the manufacturing process, and even the service life of the equipment can all affect the dielectric loss.
Humidity and pollution: Insulation surfaces that are damp or contaminated with dust and oil can form conductive pathways, increase leakage current, and thus increase losses.
Material aging: Over time, insulation materials will undergo aging, cracking, internal structural changes, increased conductivity, and naturally increased dielectric loss.
Partial discharge: If there are small gaps or bubbles inside the equipment, partial discharge may occur under the action of an electric field, generating heat and chemical reactions, accelerating insulation degradation.
Temperature changes: Excessive or insufficient temperature can affect the molecular motion of insulating materials, thereby altering their dielectric properties.
How to use this' medical examination knife 'effectively?
With the high-voltage dielectric loss tester, we can have a more intuitive understanding of the "health status" of the equipment. Wuhan UHV Power Technology Co., Ltd. provides professional equipment and technical support to help us conduct more accurate measurements.
Connecting devices: Firstly, it is necessary to correctly connect the tester to the device under test, ensuring that the wiring is firm and reliable. This is the foundation of insulation performance testing for power equipment.
Applying voltage: The tester will apply a high voltage to simulate the operating conditions of the device during normal operation.
Measurement loss: While applying voltage, the instrument accurately measures the current flowing through and calculates the tangent of the dielectric loss angle (tan δ). This value is a key indicator for measuring the quality of insulation.
Analysis results: Based on the factory standards and operating experience of the equipment, analyze the tan δ value. If the value is too high, it means that there may be a problem with the insulation of the equipment, which requires further inspection or even repair.
Mastering these to make the 'physical examination' more outstanding
Choose appropriate instruments: Different types and voltage levels of equipment need to be matched with high-voltage dielectric loss testers of different specifications.
Standardized operation: Strictly follow the instrument manual to ensure the accuracy of measurement data.
Combining historical data: By comparing the previous measurement data of the equipment, the trend of changes in insulation performance can be more timely detected.
Pay attention to environmental factors: When measuring, try to choose a dry and clean environment to avoid external interference.
Wuhan UHV Power Technology Co., Ltd. has rich experience in the field of high-voltage electrical equipment diagnosis. Its provided dielectric loss testing solutions can greatly improve the operational reliability of equipment and reduce the incidence of faults for power enterprises.
FAQ
Q1: What is the tangent of dielectric loss angle (tan δ)? A1: tan δ is a key parameter for measuring the degree of insulation material loss. The smaller the value, the better the insulation performance.
Q2: Why does the tan δ value change with increasing temperature? A2: An increase in temperature will accelerate the movement of free charge carriers in insulating materials, increase conductive components, and lead to an increase in tan δ value.
Q3: What is the normal tan δ value? A3: The normal value range may vary depending on the device type, voltage level, and manufacturing standards, and there are generally clear criteria for determining it.
Q4: Apart from tan δ, what other parameters can reflect insulation performance? A4: You can also pay attention to parameters such as insulation resistance and partial discharge.
Q5: How to avoid causing secondary damage to the equipment during testing? A5: Choosing qualified testing instruments, standardizing operating procedures, and having professional personnel conduct testing are key.