With the continuous advancement of power infrastructure construction and power equipment operation and maintenance work, more and more electrical testing tasks need to be completed outdoors, in remote areas, and in complex industrial sites. Compared to laboratory environments, these sites often face issues such as high temperature, low temperature, humidity, dust, vibration, and electromagnetic interference, which place higher demands on the stability, reliability, and environmental adaptability of testing equipment.
For power engineering companies, substation operation and maintenance departments, power equipment manufacturers, and third-party testing agencies, choosing a testing equipment suitable for harsh on-site environments not only affects the accuracy of testing results, but also directly affects on-site work efficiency and personnel safety. So, what factors should be considered in the actual procurement process?
1、 Pay attention to the environmental adaptability of the equipment
Environmental adaptability is the first consideration when choosing on-site testing equipment. There are significant environmental differences in different regions and application scenarios. For example, outdoor substations may be subject to long-term exposure to sunlight, rain, and dust, while industrial plants may experience strong vibrations, electromagnetic interference, and temperature changes.
When purchasing, it is important to understand the operating temperature range, storage temperature range, humidity adaptability, and protection level of the equipment. For equipment that needs to be used outdoors, attention should also be paid to the sealing performance of the casing to prevent dust and moisture from entering the interior and affecting the normal operation of electronic components and measurement circuits.
If the equipment needs to be used for a long time in high temperature, low temperature, or high humidity areas, products that have undergone corresponding environmental adaptability tests should be prioritized, and the technical parameters provided by the manufacturer should be confirmed to meet the actual usage conditions.
2、 Emphasize measurement accuracy and operational stability
The harsh on-site environment not only affects the service life of equipment, but may also have an impact on test data. Therefore, measurement accuracy and operational stability are two aspects that cannot be ignored in the selection process.
For high-voltage power testing equipment, on-site test results are often an important basis for judging the insulation performance, operating status, and potential faults of electrical equipment. If the measurement data is unstable, it may cause the staff to be unable to accurately determine whether the equipment meets the relevant technical requirements.
When purchasing, the measurement range, accuracy, resolution, repeatability, and anti-interference ability of the equipment should be understood in conjunction with specific testing projects. At the same time, attention should also be paid to whether the equipment can maintain stable measurement performance under different temperatures and working conditions.
For example, series resonance test devices, transformer testing equipment, insulation resistance testers, and partial discharge detection equipment all need to choose appropriate technical configurations based on their respective testing principles and usage environments.
3、 Choose a sturdy and durable structural design
On site testing usually requires frequent movement of equipment, and sometimes work needs to be carried out at construction sites, outdoor platforms, or equipment areas with limited space. Therefore, the mechanical structure and portability of the equipment are equally important.
When making purchases, it is important to focus on the following aspects:
Shell structure: Adopting a sturdy and reliable shell design to better protect internal circuits and critical components.
Seismic performance: For equipment that is frequently transported and moved, attention should be paid to the internal component fixing method and overall vibration resistance.
Connection interface: Test terminals, aviation plugs, and power interfaces should be securely connected to reduce losses caused by frequent plugging and unplugging.
Transportation design: Select products with mobile wheels, handles, or specialized transport boxes based on the weight and volume of the equipment.
Operation panel: The layout of the display screen and control area should be clear, making it convenient for staff to operate in complex environments.
For large-scale high-voltage testing equipment, modular design, on-site assembly methods, and ease of connection between different components also need to be considered.
4、 Consider the ability to resist electromagnetic interference
Substations, power plants, and large industrial sites often have complex electromagnetic environments. The operation of high-voltage equipment, switch operation, and electromagnetic interference generated by high current circuits may all affect the normal operation of precision measuring instruments.
Especially partial discharge detectors, dielectric loss testers, relay protection testers, and high-precision electrical measurement equipment are more sensitive to on-site interference.
When selecting equipment, it is important to understand its electromagnetic compatibility design, including its resistance to electrostatic discharge, radio frequency electromagnetic fields, electrical fast transient pulse trains, and surges.
Meanwhile, a reasonable grounding method, shielded cable design, and testing circuit layout are also very important. We cannot rely solely on the anti-interference performance of the instrument itself, but also need to develop a reasonable testing plan based on the on-site conditions.
5、 Pay attention to operational convenience and automation functions
In complex on-site environments, testers may need to simultaneously complete tasks such as equipment wiring, parameter settings, data recording, and safety monitoring. Therefore, the simplicity of the operation process directly affects the efficiency of on-site testing.
When purchasing, priority can be given to equipment with the following functions:
1. Automatic testing function: reduces repetitive manual operations and lowers the probability of human error settings.
2. Automatic voltage boosting and protection function: Achieve standardized test control while meeting equipment testing principles and safety requirements.
3. Data storage function: Save test results for subsequent analysis and report organization.
4. Remote control function: allows operators to control equipment within a safe distance.
5. Data export function: Supports the transfer of test data to the computer, making it convenient to establish equipment detection files.
6. Chinese and English operating interface: convenient for technical personnel with different language backgrounds to use.
For testing teams that need to frequently switch between different substations and engineering projects, equipment with simple operation and practical functions is often more conducive to improving work efficiency.
6、 Pay attention to on-site safety protection functions
Safety performance is a very important aspect in the selection of high-voltage power testing equipment. Especially under high voltage, high current, and complex wiring conditions, the equipment must have safety protection measures that match its testing function.
When purchasing, it is necessary to check whether the functions of overvoltage protection, overcurrent protection, short circuit protection, grounding monitoring, emergency stop, and abnormal state alarm are complete according to the specific equipment type.
For series resonance test devices and AC withstand voltage test equipment, attention should also be paid to zero start, flashover protection, detuning protection, and abnormal cut-off function during the test process.
It should be noted that automatic protection function cannot replace on-site safety management. Before testing, grounding, isolation, warning area setting, and personnel safety confirmation should still be completed in accordance with relevant regulations.
7、 Select devices based on specific application scenarios
There are significant differences in equipment requirements for different power testing tasks, and selection cannot be based solely on the voltage level or maximum testing capacity of the equipment. It is also necessary to make a comprehensive judgment based on the type of test object, on-site environment, and actual testing items.
For example, when conducting electrical equipment testing at a substation site, it is usually necessary to consider the stability and anti-interference ability of equipment such as series resonance test devices and transformer testers; In on-site cable testing, special attention should be paid to the output capability, portability, and safety protection functions of VLF low-frequency high-voltage generators and series resonant devices.
For equipment testing in power plants, generator testing equipment and insulation testers need to have appropriate measurement ranges and stable data performance. For switchgear testing, it is necessary to select high-voltage switch characteristic testers, circuit resistance testers, and other equipment according to specific projects, and pay attention to the convenience of wiring and data accuracy.
If the main job is transformer testing, products such as transformer ratio testers and winding deformation testers can be considered, and the specific configuration can be determined based on the testing items, equipment types, and site conditions.
Therefore, before procurement, the type of test sample, testing voltage level, testing items, and on-site environment should be clearly defined to avoid affecting actual use due to equipment functional mismatch.
8、 After sales service and technical support are equally important
For testing equipment that requires long-term use outdoors and complex industrial sites, after-sales service not only affects equipment maintenance costs, but also relates to whether the project can be completed as planned.
Before procurement, it is recommended to understand whether the supplier can provide complete technical information, operating instructions, on-site usage guidance, equipment calibration support, and fault repair services.
In addition, attention should be paid to the supply of vulnerable parts and spare parts. If the equipment malfunctions, whether the supplier can provide remote technical support in a timely manner will also affect the continuity of on-site work.
For overseas buyers, it is necessary to further confirm whether the equipment supports English operation interface, English technical documents, remote technical guidance, and international transportation packaging requirements.
When conducting power testing in harsh on-site environments, the selection of equipment cannot be solely based on price and technical parameters. Environmental adaptability, measurement accuracy, structural reliability, electromagnetic interference resistance, operational convenience, safety protection, and after-sales service should all be included in the scope of procurement evaluation.
Wuhan UHV Power Technology Co., Ltd. focuses on the research and production of power testing equipment. Its products include high-voltage testing equipment, transformer testing equipment, electrical testing instruments, and related power testing systems. It can provide various testing solutions for power engineering, substations, power plants, and electrical equipment manufacturing enterprises.
For users with special on-site testing requirements, it is recommended to provide detailed information to the manufacturer about the usage environment, type of test sample, testing voltage level, and specific testing items before procurement, in order to select equipment that is more suitable for actual working conditions and improve the safety, accuracy, and efficiency of on-site testing work.
