Description​

The ABB REF545KC133AAAA​is a numerical feeder protection terminal designed for reliable protection of medium-voltage distribution networks.This advanced protection relay combines comprehensive feeder protection functions with sophisticated control capabilities,ensuring safe and selective operation of power distribution systems.The REF545KC133AAAA​delivers exceptional performance in utility and industrial applications where power system reliability is critical.

Application Scenarios​

In a large manufacturing facility’s primary distribution substation,the ABB REF545KC133AAAA​protection terminals were deployed to protect critical 20kV feeders supplying production halls.During a cable insulation failure caused by excavation work,the REF545KC133AAAA​detected the earth fault within 12 milliseconds and initiated selective tripping,isolating the fault while maintaining power to healthy feeders.The relay’s detailed event recording with time-synchronized fault data enabled maintenance teams to quickly locate and repair the damaged cable section.Over three years of operation,the REF545KC133AAAA​terminals have performed over 50 successful fault clearance operations with zero misoperations,demonstrating exceptional reliability in maintaining power continuity.

Parameter​

Main Parameters

Value/Description

Product Model

REF545KC133AAAA​

Manufacturer

ABB

Product Type

Numerical Feeder Protection Terminal

Rated Current

1A or 5A(configurable)

Rated Voltage

110-240V DC/AC

Frequency

50/60 Hz

Protection Functions

Overcurrent,Earth-fault,Thermal overload,Auto-reclosing

Number of Stages

4 non-directional overcurrent,2 earth-fault

Operating Time

<20 ms(typical)

Reclosing Cycles

Up to 3 shots programmable

Communication

RS-485,Ethernet(optional)

Protocols

IEC 60870-5-103,Modbus,DNP3.0

Measurement Accuracy

Current±1%,Voltage±0.5%

Event Records

100 events with time tagging

Fault Records

5 records with oscillography

Control Outputs

5 programmable relays

Operating Temperature

-25°C to+55°C

Storage Temperature

-40°C to+70°C

Protection Degree

IP54

Dimensions

177mm×177mm×220mm

Weight

4.0 kg

Standards

IEC 60255,IEEE C37.90

Technical Principles and Innovative Values​

Innovation Point 1:The REF545KC133AAAA​features adaptive overcurrent protection with inverse time characteristics that automatically adjust based on load current and pre-fault conditions.This intelligent characteristic provides faster clearing times for severe faults while maintaining security against nuisance tripping during normal load variations.

Innovation Point 2:Advanced auto-reclosing functionality supports multiple reclosing sequences with programmable dead times and synchronism check.The REF545KC133AAAA​can differentiate between transient and permanent faults,optimizing reclosing strategy to minimize stress on the power system while maximizing service restoration.

Innovation Point 3:Integrated thermal overload protection uses a sophisticated thermal model that accounts for current magnitude,ambient temperature,and cooling time constants.This provides accurate protection for cables and transformers while allowing maximum utilization of equipment thermal capacity.

Application Cases and Industry Value​

In a municipal water treatment plant’s pump station upgrade,the ABB REF545KC133AAAA​protection terminals were implemented to replace aging electromechanical protection systems.The new REF545KC133AAAA​system provided sensitive earth fault protection(0.5A setting)that detected incipient cable insulation degradation before it caused major failures.The relay’s communication capabilities enabled remote monitoring from the central control room,reducing maintenance response time by 60%.The project resulted in a 40%reduction in outage duration through faster fault location and successful auto-reclosing,while the remote monitoring capabilities reduced truck rolls by 50%.

Related Product Combination Solutions​

REF545KC132AAAA​|Basic version with standard protection

RET545​|Transformer protection terminal

REC545​|Control and communication unit

RED545​|Differential protection terminal

SPA​|Communication adapter

RGU​|Local control interface

F650​|Digital fault recorder

COM600​|Station communication gateway

Installation and Maintenance​

Installation Preparation:Before installing the REF545KC133AAAA,verify CT and VT ratios match system parameters.Ensure proper wiring practices with adequate separation between current and voltage circuits.Have configuration tools and software ready for commissioning.

Maintenance Recommendations:Perform annual testing of all protection functions using primary injection.Regularly review event records and check relay settings.Maintain accurate records of all setting changes and firmware versions.

Product Guarantee​

We guarantee that every ABB REF545KC133AAAA​is a genuine ABB product manufactured to the highest quality standards.Our technical team provides comprehensive support including protection coordination studies,configuration,and commissioning services.

Contact us for professional protection solutions using genuine ABB REF545KC133AAAA feeder protection terminals.

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