Application Scenarios
In a crucial regional power substation,maintaining uninterrupted power supply while ensuring grid safety is paramount.A challenge arose where intermittent earth faults,though not immediately catastrophic,caused gradual damage to equipment and posed risks to personnel.The existing protection scheme,based on older technology,lacked the sensitivity and selectivity to quickly isolate these elusive faults,leading to prolonged troubleshooting and increased maintenance costs.Integrating the ABB SPAJ110 C-AA earth-fault relay into the substation’s protection system offered a decisive solution.Its highly sensitive,two-stage earth-fault detection capabilities,combined with precise time characteristics,allowed the operator to set the relay to rapidly identify and isolate even low-level earth faults before they escalated.This swift and accurate fault clearing,enabled by the SPAJ110 C-AA,minimized damage,reduced downtime,and significantly enhanced the overall reliability and safety of the power distribution network,proving its indispensable role in modern grid infrastructure.
Parameter
Main Parameters Value/Description
Product Model SPAJ110 C-AA
Manufacturer ABB
Product Category Earth-Fault Protection Relay
Protection Stages Two:Low-set(I0>)and High-set(I0>>)earth overcurrent
Time Characteristics Low-set:Definite-time or Inverse-time(IDMT);High-set:Definite-time
Auxiliary Supply Voltage Available in different ranges(e.g.,80-265 V AC/DC or 18-80 V DC via plug-in power module)
Output Relays Two heavy-duty trip relays,four signal relays(configurable)
Communication Interface Serial interface for fiber-optic bus connection to control systems
Self-Supervision Continuous hardware and software self-diagnostics with auto-diagnosis
Display Local numerical display for measured/set values and fault data
Installation Method Flush or semi-flush panel mounting
Family Member of the ABB SPACOM product family
Technical Principles and Innovative Values
The ABB SPAJ110 C-AA leverages sophisticated technical principles to deliver robust earth-fault protection:
Numerical Protection Technology:Unlike older electromechanical relays,the SPAJ110 C-AA employs a microprocessor-based numerical platform.This enables highly precise measurement of neutral current via current transformers,accurate digital filtering,and the execution of complex algorithms for sensitive and selective earth-fault detection.This digital approach enhances accuracy and reduces measurement errors.
Dual-Stage Earth-Fault Detection with Flexible Characteristics:The SPAJ110 C-AA offers a two-stage protection scheme(low-set I0>and high-set I0>>)for comprehensive fault coverage.The low-set stage can operate with either a definite-time characteristic(fixed time delay)or an inverse-time characteristic(tripping time inversely proportional to fault current),providing flexibility for coordination with upstream/downstream protection.The high-set stage provides instantaneous or definite-time operation for rapid clearing of severe faults.
Continuous Self-Supervision and Diagnostics:A key innovation of the SPAJ110 C-AA is its integrated self-supervision system with auto-diagnostics.This feature continuously monitors the relay’s internal hardware and software,automatically detecting and signaling internal faults.This proactive diagnostic capability significantly increases the reliability and availability of the protection system,as it alerts operators to potential relay malfunctions before they can compromise grid safety.
Configurable Output Matrix and Communication:The SPAJ110 C-AA offers a flexible output relay matrix,allowing protection start or trip signals to be routed to desired output relays for tripping circuit breakers,providing alarms,or blocking other cooperating protection relays.Its serial interface also enables seamless integration with substation automation and network control systems via a fiber-optic bus,supporting remote monitoring and control.
Application Cases and Industry Value
In a large industrial complex with extensive medium-voltage distribution,an aging protection system was struggling with localized earth faults that frequently caused entire feeder sections to trip,leading to unnecessary production halts.After an in-depth analysis,the facility decided to replace its electromechanical earth-fault relays with the ABB SPAJ110 C-AA.The integration was straightforward,thanks to its standard mounting and clear wiring diagrams.Post-installation,the SPAJ110 C-AA’s enhanced sensitivity allowed the maintenance team to detect subtle earth leakages that previously went unnoticed,indicating potential insulation deterioration.The relay’s selective tripping capabilities ensured that only the affected feeder section was isolated,preventing cascading trips across the entire complex.This resulted in a significant reduction in unscheduled downtime by 30%and a 15%decrease in equipment damage due to faster fault clearance.The improved fault data recording provided by the SPAJ110 C-AA also streamlined root-cause analysis,leading to more proactive maintenance strategies.
Related Product Combination Solutions
ABB SPAJ140 C:A combined overcurrent and earth-fault relay from the same SPACOM family,often used in conjunction with the SPAJ110 C-AA for comprehensive feeder protection.
ABB SPAU110 C:A residual overvoltage relay,which can be configured to cooperate with the SPAJ110 C-AA for blocking/deblocking operations in specific earthing systems.
ABB RE_ Relay Series:Modern protection and control relays(e.g.,REF615,REF620)that represent the current generation of ABB’s numerical relays,offering advanced features and communication protocols for system upgrades.
ABB Current Transformers(CTs):Essential accessories for the SPAJ110 C-AA,as the relay connects to the secondary windings of CTs to measure phase and residual currents.
ABB Circuit Breakers:The primary switching devices that the SPAJ110 C-AA will trip to isolate a faulty section of the power system.
Installation,Maintenance,and Full-Cycle Support
The installation of the ABB SPAJ110 C-AA is designed to be efficient,leveraging standard flush or semi-flush mounting options.Prior to installation,ensuring proper current transformer(CT)connections and verifying auxiliary supply voltage are crucial steps.The relay’s robust design allows it to operate reliably across a wide range of industrial environmental conditions.
Routine maintenance of the SPAJ110 C-AA is simplified by its continuous self-supervision system,which includes auto-diagnostics of both hardware and software.Should an internal fault occur,the relay provides immediate indication,reducing the need for manual checks and enhancing system availability.Fault data recording within the relay aids in efficient troubleshooting and fault handling,allowing technicians to quickly diagnose and address issues,minimizing downtime.
Our commitment extends to full-cycle support for the SPAJ110 C-AA,including comprehensive technical assistance for commissioning,operational queries,and spare parts replacement.We ensure that critical components remain available to support the longevity of your ABB protection systems.
ABB 5SHY4045L0006 3BHB030310R0001 3BHE039203R0101 GVC736CE101 5SHY4045L0006 3BHB030310R0001 3BHE039203R0101 GVC736CE101 ABB GRID BREAKER UNIT GBU72 3BHE055094R0002 3BHE031197R0001 3BHB030310R0001 In stock!!! Interested parties please inquire
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