In the testing and inspection work of the power system, the AC resonance testing system (series resonance testing device) is used to test power cables GIS、 The key equipment for conducting AC withstand voltage tests on high-voltage equipment such as main transformers. Choosing the appropriate testing system correctly not only affects the accuracy of the test results, but also directly impacts the safe operation and testing efficiency of power equipment. The core of selection is to accurately match device specifications based on actual testing capacity requirements.
Testing capacity: the primary consideration for selection
The testing capacity is the most critical parameter when selecting an AC resonance testing system. The capacity requirements for series resonant devices vary greatly depending on the testing of different power equipment. For example, the withstand voltage test of cross-linked cables needs to consider the voltage level, length, and cross-sectional area of the cable; The withstand voltage test of the generator should be determined based on its capacity and voltage level; GIS and SF6 switch equipment also have their own test parameter requirements.
Wuhan UHV Power Technology Co., Ltd. (Wuhan UHV), as a leader in the high-voltage electrical measurement industry, has been deeply involved in this field for nearly 22 years. It can provide customized equipment with rated capacities ranging from 75kVA to 10000kVA and above. The rated voltage range covers 25kV to 800kV, the rated current can be customized from 3A to 45A, and the working frequency is 30~300Hz, which can meet diverse testing needs.
Selection principle: Accurate matching to avoid waste
Improper selection may result in the inability to conduct experiments properly or cause resource waste. The technical experts of Wuhan UHV suggest that the selection should follow the following core principles:
1、 Clearly define the parameters of the test sample and accurately calculate the capacity
The capacitance of the test sample is the key factor determining the required reactor capacity - the larger the capacitance, the larger the required reactor capacity. Users need to accurately calculate the capacity and voltage level of the required device based on the specific parameters of the test sample.
2、 Voltage level matching, range adaptation
Select the range of the device based on the highest voltage level of the equipment under the jurisdiction of our unit. The specifications required for a 10kV distribution network and a 110kV substation are completely different. The เรโซแนนซ์อนุกรม scheme of Wuhan UHV series covers the complete voltage level requirements from distribution to ultra-high voltage. For example, the UHV-405kVA/270kV scheme can meet the AC withstand voltage test of various equipment such as 4.5km 10kV/300mm ² cable, 2km 35kV/300mm ² cable, 0.5km 110kV/300mm ² cable, and 110kV main transformer.
3、 Focus on performance advantages and lower on-site barriers
The core advantage of series resonance technology is that it significantly reduces the requirement for power supply capacity. The series resonant power supply utilizes resonant reactors and the capacitance of the test object to resonate and generate high voltage and high current. The power supply only needs to provide the active consumption part of the system, and the required power supply for the test is only 1/Q of the test capacity. This feature greatly reduces the required power supply capacity of the equipment, as well as the weight and volume of the equipment, which is generally 1/10 to 1/30 of that of ordinary test devices.
For example, when conducting voltage withstand tests on 110kV cross-linked cables, traditional equipment may require a power capacity of 500kVA, while the Wuhan UHV series resonant device only requires around 20kVA of power to meet the requirements, greatly reducing the difficulty and cost of on-site testing.
4、 Considering comprehensively, focus on quality and service
In addition to capacity matching, selection also needs to pay attention to the performance characteristics of the device, the strength of the manufacturer, and after-sales service. The Wuhan UHV series resonant device adopts advanced DSP platform technology, which has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover), effectively ensuring the safety of the testing process. The device is easy to operate, with blue screen display of test data, test status, and real-time operation step prompts, greatly improving test efficiency.
In addition, Wuhan UHV adopts a manufacturer direct sales model to provide users with a comprehensive service system, including operation training, remote and on-site technical support, etc.
The core of choosing an AC resonance testing system is to make precise matching based on the actual testing capacity requirements. Every factor, from the voltage level and capacitance of the test sample to the power supply conditions at the test site, affects the final selection decision. Wuhan UHV provides reliable technical support and solutions for various power testing needs with its complete product line.
