By hvhipot 
Electricity safety sounds like an old topic, but every slight negligence may bring unexpected risks. In the world of electrical equipment, the stability of insulation resistance is the cornerstone to ensure the normal operation of everything. Today, let’s talk about the “old friend” who can help you “see through” the insulation condition – pointer insulation resistance meter.
What is “pointer insulation resistance meter”?
In short, it is an instrument used to measure the insulation performance of electrical equipment or lines. Imagine that every electrical appliance is like a child with a “coat”. This “coat” is the insulation layer, which can prevent the current from running around, protect us from electric shock, and prevent the short circuit of equipment from causing fire. When the “coat” becomes thin, aged or damaged, its “insulation resistance” will drop. The pointer insulation resistance meter is to apply a DC voltage, measure the small current flowing through the insulator, convert it into resistance value, and then use a pointer to indicate it on the dial. The lower the value, the worse the insulation performance and the greater the potential danger.
What are the “behind the scenes” that affect the insulation resistance?
Environmental factors: humidity, high temperature, dust, corrosive gas, etc., can accelerate the aging of insulating materials and reduce their resistance value.
Service time: any material has a service life, and electrical equipment is no exception. Long time operation and frequent startup and shutdown will cause loss of insulation layer.
External damage: mechanical impact, rat bite, aging and cracking, etc., directly damaging the integrity of the insulation layer.
Material itself: different materials have different weather resistance and aging resistance, which will also affect the durability of insulation performance.
Who is the “right-hand man” for measuring insulation resistance?
When it comes to measuring tools, the pointer insulation resistance meter is definitely a classic choice. It is easy to operate, intuitive and easy to understand, and is very suitable for on-site rapid detection. Of course, with the development of technology, there are also digital insulation resistance tester, which has more powerful functions and more accurate readings. However, for many scenarios requiring rapid judgment, the pointer table still has its irreplaceable advantages.
In terms of equipment testing, the solutions provided by HV Hipot Electric Co., Ltd. can help us more comprehensively assess the health status of electrical equipment, and accurate insulation resistance measurement is an important part of it.
How to use the pointer insulation resistance meter? Follow suit!
It is not difficult to use the pointer insulation resistance meter. The key is to follow the correct steps and safety regulations:
Check the instrument: ensure that the appearance of the instrument is intact, the pointer can move freely, and the range is selected correctly.
Connecting line: connect one end of the test line to the grounding terminal (or shell) of the equipment to be tested, and the other end to the power line (or phase line) of the equipment.
Apply voltage: shake the handle to make the instrument generate test voltage.
Read the value: observe the deflection angle of the pointer and read the insulation resistance value.
Judgment result: judge whether the insulation resistance is qualified according to industry standards or equipment requirements.
Important: before measuring, make sure that the equipment has been powered off and discharged to avoid danger.
How to do better? Professional experience to help!
To evaluate the insulation state more accurately, in addition to relying on the pointer insulation resistance meter, there are also some skills:
Regular inspection: do not wait for problems to be measured. Conduct insulation resistance test regularly and establish the “health record” of the equipment.
Multi point measurement: for complex equipment, it can be measured by sections and points to find out the weak links.
Refer to historical data: comparing the current measured value with historical data, we can see the change trend of insulation performance more clearly.
Combined with other detection methods, such as live detection, partial discharge detection, etc., comprehensively analyze the equipment condition.
HV Hipot Electric Co., Ltd. has accumulated rich experience in the field of detection and maintenance of high-voltage electrical equipment. Their technology and products can provide users with more professional support and ensure power safety.