Digital dual display insulation resistance tester

NegotiableUpdate on 05/06

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The digital dual display insulation resistance tester is a high-precision insulation resistance measuring instrument that integrates digital display and analog pointer display. It is designed specifically for insulation performance testing of power systems, industrial equipment, and various electrical devices. This instrument accurately measures the insulation resistance values of transformers, transformers, generators, high-voltage motors, power cables, lightning arresters and other equipment by outputting adjustable DC high voltage. It is a key tool for evaluating the insulation condition of electrical equipment and preventing electrical faults.

Product Details

　　1、 Product Overview and Definition

As a modern upgraded product of traditional hand cranked megohmmeters, the digital dual display insulation resistance tester integrates advanced technologies such as embedded industrial microcontroller real-time operating system, high-precision microcurrent measurement system, and digital boost system. Its unique dual display design - digital segment code display and analog pointer synchronous operation, retains the intuitive and dynamic observation advantages of traditional pointer instruments, and has the precise reading function of digital display, achieving a technological breakthrough in the field of insulation resistance testing.

This instrument is widely used in various fields such as power system operation and maintenance, equipment manufacturing, engineering acceptance, and preventive testing. It is particularly suitable for insulation testing needs of large capacity equipment such as large transformers, long-distance power cables, and high-voltage motors. With the development of power equipment towards high voltage and large capacity, ordinary megohmmeters can no longer meet the requirements of modern insulation testing. Digital dual display insulation resistance testers have become equipment for insulation testing in the power industry due to their testing capabilities and intelligent characteristics.

　　2、 Technical principles and working methods

2.1 Core Measurement Principles

Working based on the fundamental principle of Ohm's law (R=U/I). The high-voltage generator inside the instrument generates a stable DC test voltage, which is applied to the tested equipment through the test line. The small leakage current generated is collected by a high-precision microcurrent measurement system, driven by a V/I conversion circuit to drive the pointer head, and processed by a microcontroller after A/D conversion, displaying accurate insulation resistance values on the LCD screen.

The instrument adopts an advanced algorithm of timely voltage and current sampling for division operation. Even if the voltage changes during the testing process, the resistance value calculated by Ohm's theorem can maintain a high degree of accuracy. This design overcomes the disadvantage of large measurement errors in traditional megohmmeters during voltage fluctuations, ensuring the reliability of test results.

2.2 Implementation of Dual Display Technology

The core of digital dual display technology lies in the combination of mechanical pointers and graphic dot matrix liquid crystal displays. The mechanical meter head adopts an ultra-thin wire structure seismic design, which has the characteristics of anti vibration and anti impact, and can intuitively reflect the dynamic change process of insulation resistance. The LCD screen provides accurate digital readings, operation guidance, and display of test parameters.

This dual display design meets the usage habits of different user groups: the older generation of power workers are more accustomed to observing the swinging trend and approximate range of the pointer, while young technicians tend to read accurate numerical results. The two display modes work synchronously without interfering with each other, retaining the operating experience of traditional instruments while incorporating the precision of modern digital technology.

　　3、 Main technical features and advantages

3.1 Intelligent testing function

The digital dual display insulation resistance tester has highly intelligent testing functions. The instrument is controlled by a 32-bit microcontroller with a fully Chinese operating interface, which can automatically calculate the absorption ratio (DAR) and polarization index (PI), two key insulation performance indicators. During the testing process, the instrument automatically stores test data for 15 seconds, 1 minute, and 10 minutes, providing complete time series data for insulation state analysis.

The instrument supports multiple testing modes, including rapid testing, withstand voltage testing, timed testing, etc., to meet the needs of different testing scenarios. The automatic range conversion function makes the operation more convenient, and users do not need to manually switch the range. The instrument will automatically select the measurement range based on the measured resistance value.

3.2 * output capability and anti-interference performance

The output capability is significantly better than traditional megohmmeters. The short-circuit current generally exceeds 3mA, and some models even reach 5mA, which can provide sufficient charging current for large capacitive loads and ensure the accuracy of test results. This high current output capability is particularly suitable for testing equipment such as large capacity transformers and long-distance power cables.

In terms of anti-interference performance, the instrument adopts a new circuit design and digital filtering technology, which can work stably in strong electromagnetic interference environments. Some models can still ensure testing accuracy when the interference current reaches 2mA, especially suitable for on-site testing of substations with voltage levels of 110kV and above.

3.3 Security Protection and Convenient Design

Safety is the primary consideration in insulation testing. The instrument is equipped with multiple safety protection mechanisms: there are sound and light prompts during high-voltage output, automatic discharge after testing, and real-time monitoring of the discharge process to prevent residual charges from causing electric shock hazards. The instrument also has functions such as short circuit protection, overload protection, and battery undervoltage protection to ensure the safety and reliability of the testing process.

The portability design is also an important feature of this product. The weight of the instrument is usually between 2-3kg, with a compact size that is easy to carry and operate on site. AC/DC dual-use power supply design, built-in large capacity lithium battery, can be used continuously for more than 6 hours when fully charged, meeting the needs of long-term field testing.

　　4、 Technical parameters and performance indicators

output voltage		2500V DC	5000V DC	10000V DC
Accuracy	temperature	23℃±5℃
	insulation resistance	5M～100G ±5%	10M～200G ±5%	25M～400G ±5%
		Other range: ± 10%
	output voltage	2.5M～100G 0～+10%	5M～200G 0～+10%	10M～400G 0～+10%
High voltage short-circuit current		≥1mA
working power supply		8 AA type high-capacity rechargeable batteries, external charging adapter
Working temperature and humidity		-10 ℃~40 ℃, relative humidity 85%
Storage temperature and humidity		-20 ℃~60 ℃, relative humidity 90%
insulation performance		When the voltage between the circuit and the casing is 1000V DC, 2000M Ω
pressure resistance		Apply a 3kV/50Hz sine wave AC voltage between the circuit and the casing, and withstand it for 1 minute
size		230×190×90mm³
weight		2.5kg

Note:

1. The appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice. If there is any act of theft or copying, legal responsibility will be pursued.

2. For more information on ultra-high voltage products, please enter the product center.
　　5、 Detailed explanation of core functions

5.1 Automatic Calculation and Data Storage

The digital dual display insulation resistance tester can automatically calculate the absorption ratio (DAR) and polarization index (PI), which are important indicators for evaluating the state of insulation materials. The absorption ratio is the ratio of insulation resistance values at 60 seconds to 15 seconds (R60s/R15s), and the polarization index is the ratio of insulation resistance values at 10 minutes to 1 minute (R600s/R60s). The instrument automatically records the data at these time points and calculates the ratio without manual intervention.

The data storage function makes test record management more convenient. The instrument can continuously store 15-20 times or even 200 sets of test results and has anti power failure protection function. The stored data includes complete information such as test time, test voltage, insulation resistance value, absorption ratio, polarization index, etc., which can be exported to a computer for further analysis through a USB interface.

5.2 Measurement of Live Voltage of Actual Test Samples

Some models have the function of measuring the live voltage of actual test samples, which can intuitively display the voltage drop of the test instrument after being loaded. This function is crucial for determining whether the testing system meets national standard requirements, ensuring that the testing voltage can remain stable under actual load conditions.

The leakage current measurement function is also an important feature of modern digital dual display insulation resistance testers. By accurately measuring leakage current, the performance of insulation systems can be evaluated more comprehensively, especially for insulation materials with surface contamination or moisture.

5.3 Automatic Calibration and Diagnosis

The instrument has an automatic calibration function, and precision calibration can be completed through specific operations on the standby interface. When the testing accuracy is not accurate enough, users can use this function to restore the measurement accuracy of the instrument. This design greatly simplifies the maintenance work of the instrument and extends the calibration cycle.

The self diagnostic function includes battery level detection, circuit status monitoring, error code prompts, etc., helping users quickly identify and solve instrument faults. The high-voltage short-circuit current detection function ensures that the instrument can automatically protect against equipment damage in the event of a short circuit at the output end.

UHV-2565数字双显绝缘电阻测试仪