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CNMIBO Solar Current Sensor and Current Transformers: Safeguarding the Safety of Photovoltaic Systems

Posted by mb

In photovoltaic power generation systems, every step of the power conversion process requires precise and reliable monitoring and protection.

Within this system, the CNT Series current sensors and current transformers serve as two dutiful guardians, undertaking the two major tasks of “sensing” and “measuring” to work together in ensuring the safe, stable, and efficient operation of the system.

CNT Series Current Sensors from CNMIBO: Real-Time Monitoring and Intelligent Protection

Take the CNT-CTKD current sensor as an example. This product is a residual current detection module, mainly designed for DC leakage current monitoring and fault detection in photovoltaic systems.

It can simultaneously monitor AC/DC composite residual current, making it a highly comprehensive device. When abnormal leakage current occurs in the system (such as insulation damage), it can automatically send a trip signal within approximately 30 milliseconds, effectively preventing electric shock or equipment damage.

Why CNMIBO Solar Current Sensors and CTs Are Suitable for Photovoltaic Applications

Key Advantages of the CNMIBO CNT Series

Complying with international safety requirements for photovoltaic, EV charging piles, wind power generation, and other fields.
Compatible for integrated use in photovoltaic inverters.
Boasting a wide temperature range of -40℃ to +85℃, it can easily adapt to outdoor high-temperature and severe cold environments.
Equipped with self-test and automatic calibration functions, it can simulate leakage current detection before startup, ensuring the system is safe and reliable prior to each operation.

In photovoltaic systems, the inverter is the most critical yet vulnerable component. A current sensor like the CNT-CTKD can monitor the system’s insulation status in real time.

Once abnormal leakage current is detected, it triggers a protection mechanism to disconnect the inverter from the grid, preventing accidents.

Simply put, it acts as a “smart power cutoff manager,” guaranteeing power production while safeguarding the safety of personnel and equipment.

CNMIBO KCT Series Current Transformers: Precise Measurement and Efficient Management

Product Description of CNMIBO KCT Series

The open-close current transformer is improved on the basis of the traditional transformer. Made of free opening and closing, it can be quickly installed and disassembled in the state of no power failure and no wire disassembly, and the operation is simple. This series of products has a wide measuring range, rated primary current range: 5~630A, rated secondary current range: 0~5A, current ratio range up to 500:1~ 10,000:1, orderly production process, to ensure its accuracy level, reliability and other technical requirements. This product complies with GB/T 20840.1.2, IEC 61869-1 and IEC 61869-2 standard.

In photovoltaic systems, its role is to accurately feed back the actual flow of solar current to the monitoring system, allowing operation and maintenance personnel to clearly grasp the power generation performance of each branch. It achieves the “precise management of every watt of electricity.” CNMIBO KCT open-type current transformers can help the system measure generated current in real time, determine whether each string of modules is outputting normally, and identify issues such as aging or performance loss. It is more like the system’s “current eye,” enabling every bit of electrical energy to be accurately calculated and optimally utilized.

Product Features

Snap structure, good linearity and high sensitivity
High permeability silicon steel with good linearity and high sensitivity
Internal epoxy resin casting, good stability, light weight, easy installation

Scope of Application

It is suitable for rural power grid reconstruction, electrical fire monitoring, fire prevention and leakage system, intelligent power system, power measurement, power quality analysis and electrical equipment signal acquisition, power demand side management of lighting equipment, motor, power device and other equipment, small current grounding system, electromagnetic relay protection, microcomputer protection, intelligent power, environmental protection monitoring, etc.

Performance Specifications

Electrical parameters

Working frequency：50~2KHz
Rated input：5A~2000A
Measuring range：10% In~130% In
Rated output：0.333V (AC) or 0~5A
Ratio difference：≤±0.1%
Phase difference：≤±10 minutes
Dielectric strength：2.5KV/1mA/1min
Insulation resistance：DC500V/1000MΩ /min

Mechanical parameters

Shell：ABS, Flame retardant grade 94-V0
Skeleton：PBT
Iron core：Silicon steel
Internal structure：Clasp
Construction plan：Band fixation
Working temperature：-25℃ ~ +75℃
Ambient humidity：≤85%
Connection mode：PVC tricolor 1.5m twisted pair

Perfect Integration in Photovoltaic Systems

Functional Components	CNT-CTKD (Current Sensor)
Main Function	Leakage detection and safety protection
Output Signal	High/low level digital signals
Installation Location	Photovoltaic inverter or distribution box
Application Goals	Protect personal and equipment safety

When used together, the photovoltaic system can not only detect the normalcy of current in each power generation circuit but also provide real-time protection against potential leakage risks.

This not only improves the operational efficiency of modern photovoltaic power plants but also enhances system safety.

Why CNMIBO CT and CS Products Are More Suitable for Photovoltaic Systems

High Reliability: It can still operate stably in high-temperature, high-humidity, and strong-radiation environments.
Compliance with International Standards and Certifications: Meets IEC safety requirements, making it suitable for the global photovoltaic market.
Easy Installation: Modular and hinged designs simplify integration.
Precise and Intelligent Detection: Supports automatic calibration, self-testing, and digital output.
High Cost-Effectiveness: Compared with major international brands, it offers the same functions at a more competitive cost.

Conclusion: Safeguarding Clean Energy Sources Such as Photovoltaics

As the global energy transition accelerates, photovoltaic (PV) systems are rapidly gaining popularity. Behind this trend, core components such as the CNMIBO CNT-CTKD current sensor and CNMIBO KCT open-type current transformer are quietly enhancing the safety and intelligence of the system.

They are not merely electronic components but the nerves and senses of the PV system, making clean energy safer and more efficient.