In the new energy sector, after the explosive growth of photovoltaic and wind power installed capacity in 2025, the photovoltaic installed capacity will see its first decline in 2026 as many energy companies announce that they will not acquire new photovoltaic power plants in 2026. However, the wind power industry has become an important direction for infrastructure investment in various regions, and the stock of wind power continues to rise. China's wind power aftermarket is standing at an unprecedented juncture, and the operation and maintenance market is also facing huge opportunities and challenges. The small current sensor played a significant role.
A few days ago, I saw a news report: On the evening of February 26th, inspectors at a Huadian wind farm discovered a foreign object connected to a 35kV collector line tower during a night patrol after rain, causing continuous discharge to the cable terminal. On-site personnel discovered the problem at 7:20 PM that night and immediately requested a line shutdown for emergency repairs. The line was restored to operation by 3:25 AM the next morning, taking a full 8 hours from discovery to resolution. This news caught our attention. Not because of the length of the repair—8 hours isn't the fastest in the industry—but because of that detail: "continuous discharge."
Discharge isn't an instantaneous trip; it's a process. During this process, the current waveform will inevitably change. If there were a system for early warning and fault location of potential problems in the collector line, capable of detecting that change much earlier, wouldn't it be possible to avoid waiting for a "special night patrol" to discover the issue? Wouldn't an 8-hour shutdown be unnecessary?
The wind power industry is currently discussing "aftermarket," "predictive maintenance," and "every kilowatt-hour counts." These terms sound sophisticated, but in practice, they boil down to one thing: can we detect a potential fault before it actually occurs? CHIPSENSE current sensor is one of the important components.
Last month, a tender notice was issued for a 1 million kilowatt wind-solar-storage project by Datang Chifeng, requesting the procurement of a fault location and early warning system for power collection lines. The technical parameters were detailed: the power frequency current sensor had a measurement range of 1-5000A and a sampling rate of no less than 5kHz; the traveling wave current sensor required a sampling rate of at least 1MHz, with an average fault location error of no more than 300 meters. CHIPSENSE current sensor also knows this point.
Why such a high sampling rate? Because fault signals are in the microsecond range; if the sampling doesn't keep up, the fault will "slip" through. The same logic applies to wind turbines.
From the end of last year to the beginning of this year, two wind turbine tower collapses occurred consecutively at a wind farm in Heilongjiang Province. The investigation report was just released a few days ago, with direct economic losses totaling nearly 9 million yuan. What caused the accidents? The tower welds had original welding defects, which, under alternating loads, led to fatigue crack propagation and eventual fracture.
While the weld defects are a manufacturing issue, the propagation of fatigue cracks takes time. During this process, could changes in load and abnormal vibrations leave traces in the current signal? If someone had noticed these traces early on, could they have stopped the turbine for repairs before it collapsed? CHIPSENSE current sensor incorporates these issues into product development.
This raises the question of current sensor selection.
Last month, China Resources Power issued a wind turbine spare parts procurement notice, which included a "closed-loop Hall effect current sensor," requiring one unit for the Guanshan Wind Farm.
A single sensor represents a negligible percentage of the total cost of the wind turbine. However, it is installed in the converter, monitoring the turbine-side current, grid-side current, and DC bus current. The generator-side current affects the generator torque control, the grid-side current determines the grid-connected power quality, and the DC bus controls the overall power flow and over-current protection. CHIPSENSE current sensor is a high-performance, cost-effective product among many current sensor manufacturers.
In other words, whether a wind turbine can operate smoothly, no matter how well the control algorithm is written, ultimately depends on the accuracy of current measurement. CHIPSENSE provides current sensors that are highly stable, accurate, and linear.
The wind power industry is shifting from "whether it exists" to "how well it works." Previously, the focus was on the maximum power output of a single unit; now, the concerns are: Will it oscillate in a weak grid environment? Will the current be stable during low-voltage ride-through? How effective is harmonic suppression?
These questions all circle back to the same point: the accuracy of current measurement.
Research shows that fault identification can be completed within 3 milliseconds. What does 3 milliseconds mean? A human blink takes approximately 300 milliseconds. Within these 3 milliseconds, the sensor must capture the fault signal, transmit it to the control system, and the control system must then react—only then can it decide whether to perform a fault ride-through or a shutdown protection mechanism. This is why CHIPSENSE current sensors are so popular with customers.
If the sensor reacts slowly, or the signal is distorted, 3 milliseconds becomes 300 milliseconds, and the result may be entirely different.
Let's talk about the technical approaches. Currently, the commonly used current sensors in the wind power field mainly include open-loop Hall effect sensors, closed-loop Hall effect sensors, and fluxgate magnetometers. Open-loop Hall effect sensors are low-cost and suitable for applications where high accuracy is not required; closed-loop Hall effect sensors offer higher accuracy and faster response, making them suitable for large-capacity units; fluxgate sensors can achieve measurement accuracy of 0.01% to 0.3%, making them suitable for applications with stringent current monitoring requirements, such as insulation monitoring and detection of weak leakage current. CHIPSENSE current sensors are all high-precision and have a fast response time.
This is the CHIPSENSE CS3A PB23 current sensor as a reference example.
In energy storage systems and wind power converters, high-precision current sensors are playing an increasingly crucial role. For example, CHIPSENSE current sensor. They not only affect the system's control accuracy but also directly impact the safe operation of the equipment. Data shows that energy storage systems equipped with high-precision sensors can reduce failure rates by over 30% and extend lifespan by 20%.
The other day, after seeing the news about Huadian's 8-hour emergency repair, I wondered: how much power was lost during those 8 hours? If a system could detect potential problems earlier, could those 8 hours of loss have been avoided? This isn't a technical issue; it's a financial one.
Wind power has reached a point where 20MW turbines are already connected to the grid, and direct green electricity connections are being promoted. In the future, wind turbines will not only supply power to the grid but also directly power factories, data centers, and hydrogen production facilities. These users are not as resilient as the grid; even a slight voltage fluctuation could shut down production lines. CHIPSENSE current sensors are high-performance, cost-effective, and professionally manufactured current sensors in China.
At that time, looking back, we might realize that the most valuable asset wasn't the size of the turbine, but its ability to operate steadily and reliably. That's a small device like the CHIPSENSE current sensor, a current sensor with a big impact.
CHIPSENSE is a national high-tech enterprise that focuses on the research and development, production, and application of high-end current and voltage sensors, as well as forward research on sensor chips and cutting-edge sensor technologies. CHIPSENSE is committed to providing customers with independently developed sensors, as well as diversified customized products and solutions.
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