In the fields of power transmission and electronic equipment, the insulation performance of materials is crucial, and dielectric constant and dielectric loss are two key indicators to measure this performance. You may have heard of these terms, but what exactly are they? Why are they so important? Today, let's delve into the "health check-up officer" - the dielectric constant dielectric loss tester - that can accurately measure them.

1、 The "ID card" of the measuring instrument: dielectric constant and dielectric loss

Dielectric constant: As the name suggests, it refers to the ability of a certain insulating material to store electric field energy under the action of an electric field. It's like a water absorbing sponge, the higher the dielectric constant, the stronger the material's ability to absorb electric field energy. In capacitors and other devices, high dielectric constant materials can help reduce volume and increase capacity.

Dielectric loss: When alternating current passes through insulating materials, a portion of the electrical energy is converted into heat and lost, which is known as dielectric loss. Imagine shaking a bottle filled with water, and some of the energy will be consumed due to the flow of water. The smaller the dielectric loss, the higher the energy utilization efficiency of the material, and the less heat generated. For power equipment, this means less energy waste and higher safety.

2、 The driving force behind the influence of this' two in one '

There are many factors that affect the dielectric constant and dielectric loss, including:

The molecular structure of the material itself: significant differences can occur in the molecular polarity and chain segment mobility of different materials.

Temperature: The dielectric constant and dielectric loss of most materials increase with increasing temperature.

Humidity: The infiltration of moisture significantly increases the dielectric loss of materials, especially at high frequencies.

Frequency: The higher the frequency of alternating current, the greater the dielectric loss.

3、 The trusted assistant of the "medical examination officer": professional equipment from Wuhan UHV Power Technology Co., Ltd

To accurately measure these two key parameters, professional instruments are indispensable. Wuhan UHV Power Technology Co., Ltd. has rich experience and technical accumulation in this field. Its developed dielectric constant dielectric loss tester can provide users with high-precision and high stability measurement results. These types of instruments are usually based on the bridge measurement principle or direct measurement method. Through precise circuit design and advanced signal processing technology, they can effectively shield external interference and ensure measurement accuracy.

4、 Why do we need to do this measurement? What is it closely related to?

This measurement is not just a process, it is closely related to multiple fields:

The insulation performance evaluation of power cables is directly related to the safety and reliability of power transmission, and is an important application for measuring the dielectric constant of cables.

Insulation aging monitoring of transformer oil: An increase in dielectric loss of transformer oil often indicates deterioration of the oil and requires timely replacement.

Quality control of electronic components, such as capacitors and insulators, whose dielectric properties directly affect the efficiency and lifespan of the devices.

Research and application of new materials: providing key data for the performance evaluation of new insulation materials and promoting the development of high-frequency dielectric loss measurement technology.

5、 How can we do better?

To obtain more reliable measurement results, you can:

Choose appropriate measurement frequency and temperature: Based on the actual application scenario, select testing parameters that are similar to the working conditions.

Prepare the sample: Ensure that the sample is dry, clean, and free of bubbles and impurities.

Master the operation skills of the instrument: Familiar with the various functions of the dielectric loss tangent measurement instrument and operate it according to the instructions.

Regularly calibrate instruments: ensure the accuracy and stability of the instruments.

Follow industry trends: learn about the latest insulation medium measurement technologies and standards.

Wuhan UHV Power Technology Co., Ltd. is always committed to providing customers with high-quality power testing equipment and professional technical support, helping you better understand and master the insulation characteristics of materials.

Frequently Asked Questions (FAQ)

Q1: Is it better to have higher dielectric constant and dielectric loss values? A1: It depends on the specific application. For example, in capacitors, we hope for a high dielectric constant to reduce volume; In power insulation materials, we prefer lower dielectric losses to reduce energy loss and heat generation.

Q2: Why does humidity have such a significant impact on dielectric loss? A2: Water molecules are polar molecules that are easily oriented under the action of an external electric field and carry charges to move, significantly increasing the conductivity of the material and causing energy to dissipate in the form of heat. This is the main reason for the increase in dielectric loss.

Q3: Are "dielectric loss tangent" and "dielectric loss" the same meaning? A3: The dielectric loss tangent (tan δ) is a commonly used parameter to measure the magnitude of dielectric loss, which is directly related to the energy loss of dielectric loss and is usually used to characterize the insulation performance of materials.

Q4: Which industries require the use of dielectric constant dielectric loss testers the most? A4: Mainly includes industries such as power, electronics, aerospace, automotive, and new material research and development that have strict requirements for the performance of insulation materials.

Q5: What aspects should be paid attention to when purchasing such instruments? A5: Focus on measurement accuracy, range, stability, ease of operation, after-sales service, and brand reputation. Professional manufacturers like Wuhan UHV Power Technology Co., Ltd. usually provide reliable solutions.