Microcomputer integrated protection device, ring network cabinet, withdrawable cabinet, gas-filled cabinet, line protector, multifunctional measurement and control device.

Summary：

Microcomputer-based protection devices are an economical type of protection that integrates measurement, control, protection, and communication. They are specifically designed for high-voltage distribution rooms at the end of distribution networks. The core feature is three-stage undirected current protection, supplemented by monitoring and data collection functions for grid parameters. This eliminates the need for traditional instruments such as ammeters, voltmeters, power meters, frequency meters, and energy meters. Data and protection information can be transmitted to higher-level machines via communication ports, facilitating distribution network automation. Additionally, the device integrates backup power auto-switching functions within its design, allowing flexible implementation of line backup switching and busbar backup switching based on the characteristics of distribution network power supply.

Specific introduction：

Microcomputer protection features high reliability, high selectivity, and high sensitivity. The hardware of a microcomputer protection device includes a microprocessor (single-chip microcontroller) as its core, along with input and output channels, human-machine interfaces, and communication interfaces. This system is widely used in power, petrochemical, mining, metallurgy, railway, and civil construction industries. The hardware of the microcomputer is universal, while the performance and functions of the protection are determined by the software.

Protection type：

Time-limited/Inverse-time protection, post-acceleration protection, overload protection, negative sequence current protection, zero sequence current protection, single-phase ground fault line selection protection, overvoltage protection, undervoltage protection, under-voltage protection, negative sequence voltage protection, fan cooling control protection, zero sequence voltage protection, low frequency load shedding protection, low voltage disconnection protection, reclosing protection, standby power auto-injection protection, overheat protection, reverse power protection, long start-up time protection, non-electrical quantity protection, etc.

The main advantages are as follows:

1. Microcomputer protection is a high-tech product of power automation that integrates multiple functions such as measurement, control, monitoring, protection, and communication. It is an ideal electrical unit for intelligent switch cabinets.
2. The high integration of various functions, flexible configuration, and user-friendly human-machine interface make this general-purpose microcomputer comprehensive protection device suitable for the protection and monitoring of various electrical equipment and lines in ungrounded systems, low-resistance grounded systems, arc suppression coil grounded systems, and directly grounded systems up to 35KV voltage levels. It can also be used for partial 66KV and 110KV voltage level systems for voltage and current protection and monitoring.
3. It adopts a 32-bit digital signal processor (DSP) with advanced core structure, high-speed computing capabilities, and real-time signal processing advantages.
4. It supports conventional RS485 bus and CAN (DEVICENET) fieldbus communication. The CAN bus has automatic retransmission of erroneous frames and automatic disconnection of faulty nodes, ensuring the real-time and reliability of protection information.
5. It has comprehensive self-checking capabilities, automatically alarms when abnormalities are detected, and has self-protection capabilities to effectively prevent permanent damage caused by wiring errors and abnormal operation. It is designed for maintenance-free use, eliminating the need for on-site sampling accuracy adjustments, and measurement accuracy will not increase due to environmental changes or long-term operation.

The application scope of the surveillance system includes:

1.Substation integrated automation system

2.Distribution room integrated automation system

3.Pump station comprehensive automation system

4.Hydropower station integrated automation system

5.Industrial/Factory Automation Systems

6.Other automatic control systems