ABB RET543AM243AAAB

Technical Specifications

Communication Interfaces: Supports SPA, LON, IEC 60870 – 5 – 103, Modbus RTU/ASCII, DNP3.0, etc. It can be compatible with Profibus DP and IEC 61850 protocols through adapters such as SPA – ZC 302 and SPA – ZC 400.
Input and Output: Has 25 binary inputs and 18 output relays.
Power Supply: The specific power supply details are not clearly stated, but it is suitable for industrial – grade power supply environments.

Category: ABB

Description

Functional Features

Comprehensive Protection Functions
- Current Differential Protection: Three – phase current differential protection with stabilized and instantaneous stages for fast and selective winding short – circuit and interturn fault protection. It also has 2nd and 5th harmonic restraint, and a waveform – recognition – based unlocking feature for reliable operation even with partially saturated current transformers.
- Other Protection Functions: Basic version includes three – phase over – current, non – directional earth – fault, restricted earth – fault, transformer thermal overload and phase unbalance protection. Multi – version also includes over – voltage and under – voltage supervision, directional earth – fault, residual voltage and over – excitation protection, over – frequency and under – frequency protection, and under – impedance protection.
Control Functions
- Switch Control: Supports local and remote control of circuit breakers and disconnectors, displays device status, and realizes electrical interlocking at the device and substation levels.
- On – load Tap – changer Control: Optional automatic on – load tap – changer control function for single or parallel transformers, following the principles of master – slave, negative impedance, or minimum circulating current method.
Measurement and Monitoring Functions
- Measurement: Covers current, voltage, zero – sequence current and voltage, frequency, power factor, active and reactive power, and electric energy, etc.
- Status Monitoring: Includes circuit breaker status, trip circuit status, and self – inspection of the device, as well as SF6 gas pressure monitoring, maintenance plan, and circuit breaker electrical wear condition monitoring.
Programmable Logic Functions
- Based on IEC 61131 – 3 standard, PLC functions such as electrical interlocks and alarm logic can be programmed using Boolean numbers, timers, counters, comparators, and flip – flops through the graphical function modules in the relay configuration tool software.

Application Scenarios

Power Distribution Networks: Widely used in the protection and control of two – winding power transformers and power generator – transformer blocks in power distribution networks.
Harsh Environments: Suitable for harsh environments such as heavy industry, marine, and offshore applications due to its ability to withstand harsh conditions.

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