Technical Specifications Device Type: Digital Multifunction Protection Relay Input Signal: AC current and AC voltage analog input Power Supply: Wide‑range auxiliary AC/DC power supply Communication Interface: Multiple serial communication ports Operating Temperature: ‑20 °C to +65 °C Storage Temperature: ‑40 °C to +85 °C Relative Humidity: 5%‑95%, non‑condensing Mounting Mode: Cabinet panel mounting Certifications: CE, UL power protection equipment compliance
Functional Features Integrates multiple configurable power protection logic functions. Real‑time measurement of current, voltage, power and other electrical parameters. Built‑in fault event recording and fault waveform storage function. Programmable relay output contacts for alarm and trip control. Supports local panel setting and remote parameter configuration.
Application Scenarios Suitable for substation feeder protection, motor protection, generator auxiliary‑equipment protection, industrial factory power‑supply system protection. Applied in electric power, petrochemical and heavy‑industry power monitoring occasions.
Structural Characteristics Metal panel‑mount housing structure. Front‑side LCD display and operation keypad for on‑site checking and setting. 
Working Principle CT and PT analog signals are sent into relay internal sampling circuit. CPU unit calculates electrical parameters and compares values with protection setting thresholds. When fault condition is satisfied, relay drives output contact to execute trip or alarm, and stores fault data, meanwhile uploads information to upper host via communication port.
Installation Requirements Install relay on standard control cabinet front‑panel according to cut‑out dimension. Complete CT, PT, auxiliary power and output contact wiring on rear terminals following official drawing. Connect communication cable for remote system interconnection. Carry out parameter setting and function test before commissioning.
Usage Notes Pay attention to CT secondary circuit anti‑open‑circuit safety operation. Do not exceed allowable working temperature and humidity range. Download fault records regularly for power‑system operation analysis. Cut off auxiliary power before rear‑terminal wiring maintenance.
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