M5 Smart Grid Programmable Digital Protection and Measurement Device

M5 is a programmable microcomputer protection and measurement device, suitable for protection, control, measurement, and monitoring of voltage levels of 110/35/10/6kV. It can be configured as an incoming line, bus tie, line outgoing line, transformer outgoing line, motor outgoing line, capacitor outgoing line, PT protection, complex incoming line interconnection protection (bus tie backup), and main transformer backup protection device.

Main functions:

• Protection function: It can provide comprehensive line protection functions such as quick break, overcurrent, timed limit, inverse time limit, overvoltage, undervoltage, frequency, locked rotor, unbalanced voltage (current), overheating, direction protection, acceleration after closing, zero sequence, negative sequence, CT disconnection, reclosing, PT disconnection, control circuit disconnection, non electricity protection, low cycle load shedding, backup automatic switching, etc.
• Measurement and metering functions: Full three-phase electricity, including voltage, current, power factor, frequency, active power, reactive power, active kWh, and reactive kWh.
• Display screen: Programmable graphic LCD display, and real-time display of voltage and current waveform.
• Indicator light: Programmable three color indicator light, which can define display properties and indicator parameters.
• GPS timing: The GPS timing accuracy is 1ms, and TTL and RS422 modes can be selected.
• SOE event recording: Provides SOE recording functionality.
• Fault recording function: Provides COMTRADE format recording files with time scale standards.
• Communication function: Supports communication methods such as RS485, Ethernet, Profibus, and multiple communication protocols.

interface

• 8-way AC current input.
• 4-channel AC voltage input, suitable for various PT wiring methods.
• 16 programmable switch inputs (PLUS type can be extended to 32 channels).
• 10 programmable switch output channels (PLUS type can be expanded to 16 channels).
• Optional programmable DC analog signal input and output circuits.
• Can communicate with RTD module (remote temperature acquisition module can directly connect to 8 thermal resistors).
• RS485 interface, optional Ethernet port Profibus、 Fiber optic and other multi-channel interfaces (each interface is independent of each other).
• Optional external anti bounce circuit module.

Programmable functions:

It has programmable product logic functions that are only available on high-end products of other foreign companies, and users can freely define protection logic and other functions on a unified hardware platform. Support dedicated programmable debugging software PLPShell, through the RS232 interface of the panel, users can easily program and debug the protection function logic, engineering, and testing of M5 at any time, completely realizing the configurability of the protection device. More flexible settings can avoid on-site replacement of equipment models and the need for spare parts for each model.