In the world of power systems and electrical equipment, we often hear the term 'circuit resistance'. It is like a smoothness indicator for electric current running on the "highway". What exactly is circuit resistance? Why is it so important? Today, let's talk about this topic, especially the mystery of the circuit resistance automatic tester.

Loop resistance: a 'detail control' that should not be underestimated

Simply put, loop resistance refers to the total resistance encountered by current flowing from one point to another. It includes the resistance of the wire itself, connection points (such as switch contacts, circuit breaker contacts, busbar connections, etc.). Don't be fooled by these inconspicuous connection points, they are often the "culprits" of heating, aging, and even malfunctions.

The 'behind the scenes' driving force that affects circuit resistance

Insufficient contact pressure: This is the most common reason. If the pressure at the connection point is not sufficient, the contact area will decrease and the resistance will naturally increase.

Surface oxidation or dirt: Over time, metal surfaces may develop an oxide layer or accumulate dust and oil stains, which can increase contact resistance.

Wire material and cross-sectional area: Poor quality wires or wires with insufficient cross-sectional area have relatively high resistance.

Connection method: Different connection methods such as bolt connection and crimping may have differences in reliability and contact resistance.

Say goodbye to 'feeling based': The automatic circuit resistance tester is here!

In the past, measuring circuit resistance may have required manual operation, which was time-consuming and laborious, and the accuracy was also difficult to guarantee. Now, with the automatic circuit resistance tester, everything has become simple and efficient.

The instruments produced by Wuhan UHV Power Technology Co., Ltd. can accurately measure resistance as low as micro ohms (μ Ω). It usually uses the method of direct current resistance measurement, by applying a stable current and measuring the resulting voltage drop, to calculate the resistance value. This testing method is accurate and reliable, and can quickly detect whether there are hidden dangers in the connection points.

How can we do better? ——Intelligence and automation

Modern circuit resistance automatic testers are not only measuring tools, but also integrate intelligence and automation.

Data recording and analysis: The instrument can automatically record test data and generate reports for easy traceability and comparison.

Automatic shifting: It can automatically select the appropriate range according to the tested object, saving the trouble of manual setting.

On site calibration: Some high-end equipment supports on-site calibration to ensure measurement accuracy.

Wuhan UHV Power Technology Co., Ltd. has accumulated rich experience in this field and is committed to providing high-performance testing equipment to safeguard your power safety.

What are the aspects related to circuit resistance testing?

Safe operation of electrical equipment: Poor contact is the main cause of heating and fire.

Efficiency of power transmission: The larger the resistance, the greater the energy loss.

Maintenance cycle of equipment: Identify problems in advance, avoid equipment damage, and extend service life.

Performance testing of high-voltage equipment such as circuit breakers and switches: These are important indicators for determining equipment status.

Frequently Asked Questions (FAQ)

Q: Why does the resistance value of the circuit change over time? A: Mainly related to oxidation, corrosion, and changes in contact pressure on the contact surface.

Q: What is the best time to measure circuit resistance? A: It is recommended to carry out new equipment installation, regular maintenance, and before the equipment is put into operation.

Q: What is the significance of measuring resistance at the micro ohm level? A: The difference in micro ohm level may lead to significant heating under high current, which is the key to judging the quality of contacts.

Q: What should be noted when using an automatic circuit resistance tester? A: Ensure that the testing environment is dry, the connecting wires are in good contact, and follow the instructions for correct operation.

Q: How to choose a suitable circuit resistance automatic tester for oneself? A: It is necessary to choose according to the working voltage, current, and accuracy requirements of the tested equipment. You can consult professional manufacturers such as Wuhan UHV Power Technology Co., Ltd.

Understanding and regularly testing circuit resistance is a key factor in ensuring the safe and stable operation of the power system. By relying on modern tools such as circuit resistance automatic testers, we can more efficiently and accurately identify potential risks, thereby improving the reliability of power equipment.