Small Current Grounding Fault Location Device

Most of my country's 3kV to 66kV distribution networks use low-current grounding methods, i.e., neutral point non-effective grounding methods, including ungrounded neutral systems and neutral point grounding systems via arc suppression coils or high-resistance grounding. The advantage of neutral point non-effective grounding systems is that in most cases, the arc can be automatically extinguished and insulation restored when a single-phase ground fault occurs. However, in the event of a permanent ground fault, to prevent the fault from expanding due to increased voltage in the non-faulty phases, the faulty line must be identified and disconnected as quickly as possible. This raises the issue of single-phase ground fault line selection. This problem has not been well resolved for a long time, hindering the development of distribution network automation.

Our company's low-current system grounding fault line selection device is an upgraded product developed based on the existing "low-current grounding fault line selection devices" on the domestic market. When a single-phase ground fault occurs in a low-current grounding system, this device has the function of automatic alarm and accurate fault line location. It effectively solves the problem of long-term reliable operation of the device in harsh environments. Its structure is more reasonable and lightweight, and it can be used for the renovation of old power plants and substations, as well as for newly built power plants and substations, directly forming an integrated automation system.

* Wide-temperature LCD screen with user-friendly interface for easy operation.

* High-quality digital-to-analog converter with excellent temperature resistance, fast conversion speed, and high measurement accuracy.

* Zero-sequence voltage start-up with multiple line selection algorithms to adapt to different operating conditions.

* Can distinguish between line grounding and bus grounding.

* Provides passive alarm nodes.

* Relevant information is uploaded to the backend via communication interface.

* Fault record information can be displayed on the LCD screen to recall grounding faults; information is not lost after device failure.

* New modular circuit design; minimal on-site maintenance required after commissioning.

Baoding Simaier Electric Co., Ltd. has been awarded numerous honors, including National High-tech Enterprise, National Science and Technology-based SME, and Provincial Science and Technology-based SME. It has been rated as an AAA-level credit enterprise and is a large-scale enterprise. Currently, it holds over 20 patents and 18 software copyrights, and has passed ISO 9001 Quality Management System, ISO 14001 Environmental Management System, and ISO 45001 Occupational Health and Safety Management System certifications.