The surge arrester resistive current tester is a dedicated device for testing the performance of zinc oxide surge arresters, suitable for both live-line testing and power-off maintenance scenarios. The core value of this equipment lies in accurately detecting various insulation defects such as valve plate aging and internal moisture in the surge arrester, preventing the arrester from operating with faults, and ensuring the safety and stability of the power grid system operation. It is the core equipment for evaluating the working condition of surge arresters and conducting condition-based maintenance in the power operation process.
I. Core Measurement Principle
The surge arrester resistive current tester uses Fourier transformation and harmonic analysis technology to achieve precise measurement. The equipment can simultaneously collect the total leakage current signal of the surge arrester and the reference voltage signal from the secondary side of the voltage transformer. Through the projection method, the collected total current is accurately decomposed into resistive current and capacitive current parameters.
Among them, the capacitive current is an inherent parameter of the surge arrester and is relatively stable in state; while the abnormal increase in resistive current can directly correspond to faults such as valve plate aging and internal moisture in the surge arrester. Therefore, the resistive current value is the core effective parameter for determining the healthy operating state of the surge arrester.
II. Core Functions and Technical Specifications
The current mainstream surge arrester resistive current testers have standardized and high-precision measurement capabilities. The core measurement parameters are as follows: the measurement range of total current, resistive current, and capacitive current all cover 0-20 milliamps; the measurement accuracy of total current is ±2%, and the measurement accuracy of resistive current and capacitive current is ±5%; the voltage reference signal of the equipment is taken from the secondary side of the voltage transformer, with a signal range of 5-200 volts and a measurement accuracy of ±2%.
In addition to the basic precise measurement function, modern testers are equipped with multiple practical intelligent and scenario-based functions, suitable for complex on-site operation environments. The core characteristics are as follows:
1. Adaptive anti-interference capability
The equipment is equipped with professional anti-interference algorithms, which can automatically compensate for common phase-to-phase interference problems in substations. In the conventional three-phase surge arrester arrangement, the middle phase is prone to produce stray capacitance interference to the edge phase. The instrument can complete automatic correction through built-in algorithms, effectively eliminating interference effects and ensuring the authenticity and accuracy of edge phase measurement data.
2. Multi-mode test adaptation
The equipment supports multiple test modes, including wired test, wireless test, and three-phase simultaneous measurement, which can adapt to different on-site working conditions. The wireless test mode relies on wireless modules to transmit reference voltage signals, without the need for complex wiring operations. The wireless effective transmission distance can reach over 1000 meters, greatly simplifying the on-site operation process and improving the maintenance testing efficiency.
3. Intelligent performance diagnosis
The equipment can accurately calculate the phase angle between current and voltage to intelligently determine the operating performance of the surge arrester. The industry standard for judgment is: if the phase angle is less than 75 degrees, it indicates that the resistive current ratio of the equipment is excessive, the surge arrester’s performance is deteriorating, and maintenance and repair are required promptly.
III. Practical Operation Process
The on-site operation process of this equipment is standardized and concise, with the core divided into three steps, balancing safety and testing professionalism:
1. Safety Grounding
Before the operation, it is necessary to complete reliable grounding of the instrument shell to eliminate electrical safety hazards, which is the prerequisite for conducting all testing work.
2. Standard Wiring
The voltage signal acquisition end takes the B-phase reference voltage from the secondary side of the voltage transformer; the current signal is collected through a dedicated sensor clamp, clamped at the upper or lower end of the discharge counter of the surge arrester, and stable collection of the leakage current signal of the equipment.
3. Automatic Test
After the wiring is completed, start the equipment. The instrument can automatically complete Fourier analysis operations and directly output core test data such as resistive current peak value, total current, and equipment power consumption, and support local data storage, printing export, for convenient data retention and subsequent maintenance analysis.
IV. Equipment Selection Key Points When purchasing a resistance current tester for lightning arresters, it is necessary to consider the on-site operation scenario and focus on the three core dimensions: functionality, portability, and safety:
1. Core Functionality
Prioritize the equipment with automatic inter-phase interference compensation function, as this function can effectively adapt to the complex electromagnetic and inter-phase interference environment of substations, ensuring the accuracy of on-site test data, and is the core essential function for outdoor and substation operations.
2. On-site Portability
Adapt to the operation scenarios without external power supply in the field, and prefer the equipment with built-in large-capacity lithium batteries; at the same time, the overall weight of the equipment is recommended to be within 5 kilograms, which is convenient for maintenance personnel to carry and move, and suitable for various outdoor inspection operations.
3. Operational Safety
It should have the function of preventing incorrect wiring, which can effectively avoid equipment damage caused by manual wiring errors, reduce operation risks, and improve the service life and operational safety of the equipment.
In summary, the lightning arrester resistance current tester, with its precise detection capability, complete adaptation functions, and safe operation characteristics, is a key specialized equipment for power maintenance personnel to judge the health status of lightning arresters and implement refined condition-based maintenance. It provides reliable data support and technical guarantee for the stable operation of power grid lightning arresters.
Post time: May-29-2026