ABB 1MRK0023505-AA | Main/Backup Differential Protection Relay
Product Overview
The ABB 1MRK0023505-AA is a high-performance transformer differential protection relay in the REL 670 series,specifically designed for the protection of power transformers at voltage levels of 110kV and above.In power systems,transformers are critical equipment,and the reliability and accuracy of their protection devices directly impact the safe and stable operation of the power grid.This relay utilizes advanced digital signal processing(DSP)technology and an anti-CT saturation algorithm to achieve fast fault clearing within≤20ms,and seamlessly integrates into substation automation systems via the IEC 61850 Ed.2 communication protocol.
In the power system protection architecture,the 1MRK0023505-AA serves a dual role as both primary and backup protection for transformers.Its multi-slope differential characteristic curve accurately distinguishes between inrush current and internal fault current,supporting three-phase phase-segregated differential protection and high-impedance ground fault backup protection.Certified by KEMA and compliant with the ANSI 87T standard,this relay provides reliable protection for critical nodes in the power grid,significantly reducing the risk of equipment damage and power outages.Technical Specifications
Product Model:1MRK0023505-AA
Manufacturer:ABB
Product Type:Transformer Differential Protection Relay
Protection Functions:Main/Backup Differential(87T),Time-delayed Overcurrent(51/51N)
Operating Time:≤20ms(Differential trip to output)
Differential Accuracy:±2%or±0.02In(whichever is higher)
CT Input Requirements:1A/5A adaptive,ratio error compensation
Communication Protocols:IEC 61850-8-1(GOOSE/MMS),Modbus RTU
Hardware Interfaces:4x RJ45(Ethernet),2x RS-485,8x DO/16x DI
Operating Power Supply:48-250VDC/100-240VAC(±20%)
Operating Temperature:-25°C to+70°C
Protection Rating:IP40(panel mounting)
Certification Standards:IEC 60255,IEEE C37.90,UL 1053
Main Features and Advantages
The core competency of the ABB 1MRK0023505-AA lies in its intelligent fault discrimination capability and high-precision protection performance.This relay utilizes harmonic restraint(2nd/5th harmonic)technology to effectively distinguish between inrush current(>20%harmonic content)and actual faults,preventing false trips.The CT saturation detection function,based on a waveform change rate algorithm,ensures reliable protection even during high-impedance faults.Intelligent Fault Discrimination Capability:Utilizes harmonic restraint technology to accurately distinguish between inrush current and actual faults,preventing false trips.
CT Saturation Detection:Identifies saturation delay based on waveform change rate algorithm,ensuring protection does not fail to operate during high-impedance faults.
Multi-Slope Restraint Characteristic:3-stage slope adapts to transformer operating status,reducing false trip rate in light load areas.
Advanced Diagnostics and Waveform Recording:Supports 128-cycle fault recording,recording waveforms before and after the fault,and supports COMTRADE format export.
Self-Test and Alarm Function:Real-time monitoring of CT open circuits and setting value verification errors,uploading to the SCADA system via GOOSE signals.
Real-time Waveform Analysis:Built-in phasor diagram and harmonic spectrum display functions facilitate on-site fault troubleshooting.
Application Areas
The ABB 1MRK0023505-AA is primarily used for the protection of large transformers in power systems,especially suitable for substations and power plants with voltage levels of 110kV and above.Its application areas include:
Power Plants:Used for differential protection of generator transformers and plant service transformers.
Substations:Used for differential protection of main transformers and interconnecting transformers.
Industrial Users:Used for dedicated transformer protection for large industrial users.
Key Grid Nodes:Used for the protection of important interconnecting transformers in the power grid.
In these applications,the 1MRK0023505-AA,as the main protection device for transformers,can quickly clear internal faults,prevent fault expansion,and ensure the safe and stable operation of the power system.
Integration and Configuration Points
Integrating the 1MRK0023505-AA into the power system protection system requires detailed parameter settings and function configuration in ABB’s dedicated configuration software.Hardware installation is relatively simple;the relay is directly installed in the protection panel and connected to secondary equipment such as CTs and PTs through standard terminals.Hardware Installation:Fix the device according to standard installation dimensions,ensuring secure connection of the terminals.
Software Configuration:Use ABB’s dedicated configuration tool to set protection parameters and communication parameters.
Function Testing:After configuration,perform functional testing to verify the correctness of differential protection,overcurrent protection,and other functions.
System Integration:Integrate with the substation automation system via the IEC 61850 protocol to achieve remote monitoring and control.
Lifecycle and Procurement Recommendations
From a product lifecycle perspective,the ABB 1MRK0023505-AA is a mature and widely used product,currently in its mature phase.As a standard component of the ABB REL 670 series,it has stable technology and a large installed base worldwide.Although ABB may introduce new protection platforms,given the widespread use of the REL 670 system and the high level of customer trust in its reliability,the 1MRK0023505-AA will remain a key maintenance spare part and a preferred model for new/renovation projects in the foreseeable future.
For users,compatibility and reliability are the primary considerations when purchasing this relay.Ensuring that the relay is fully compatible with the existing protection system and choosing genuine,rigorously tested products can prevent protection malfunctions or failures caused by relay faults.We(Shenzhen Changxin)specialize in providing reliable support for power systems.Every 1MRK0023505-AA relay we supply is guaranteed to be a genuine ABB product with traceable origin.All relays undergo comprehensive visual inspection,electrical characteristics testing,and functional verification before shipment to ensure that their performance meets factory standards.We provide a 12-month warranty and strive to maintain inventory to ensure fast delivery.Our technical team can provide technical support related to power system protection and assist you with the installation and verification of the relay.
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