ABB SPAJ141C SPAJ 141C SPAJ141C-AA Overcurrent And Earth-Fault Relay

 

ABB SPAJ141C SPAJ 141C SPAJ141C-AA Overcurrent And Earth-Fault Relay

The combined overcurrent and earth-fault relay SPAJ 141 C is intended to be used for the selective short-circuit and earth-fault protection of radial feeders in solidly earthed, resistance earthed or impedance earthed power systems. The integrated protection relay includes an overcurrent unit and an earth-fault unit with flexible tripping and signalling facilities. The overcurrent and earth-fault relays can also be used for other applications requiring single-, two-, or three-phase overcurrent protection and earth-fault protection. The combined overcurrent and earth-fault relay includes a circuit-breaker failure protection unit.
The combined overcurrent and earth-fault relay SPAJ 141 C is part of ABB's Distribution Automation concept extending ABB's solution for the control and management of electric power systems.

Model: SPAJ141C
Type: Overcurrent and Earth-Fault Relay
Input Voltage: 100-240 V AC/DC
Frequency Range: 50/60 Hz
Current Inputs: 1A or 5A
Measuring Range:
Overcurrent: Configurable up to 20x In
Earth-fault current: Configurable up to 5x In
Tripping Time: Configurable time delays
Relay Outputs: Multiple output contacts for trip and alarm signals
Communication Ports: Optional serial communication ports for integration into control systems
Mounting: DIN rail or flush mounting
Operating Temperature: -10°C to +55°C

The ABB SPAJ141C is an overcurrent and earth-fault relay designed for the protection of medium and low-voltage networks. It provides reliable protection against phase overcurrents and earth faults, ensuring the safety and stability of electrical power systems. The relay is commonly used in industrial and utility power distribution systems, offering advanced protection features and customizable settings to suit specific application needs.

Characteristics

• Three-phase low-set overcurrent unit with definite time or inverse definite minimum time(IDMT) characteristic.
• Three-phase high-set overcurrent unit with instantaneous or definite time function.
• Low-set sensitive, non-directional earth-faultprotection with definite time characteristic.
• High-set non-directional earth-fault protectionwith instantaneous or definite time function.
• Built-in breaker failure protection scheme.
• Fully field-selectable output relay configuration.
• Extensive data communication capabilities overbuilt-in serial port.
• Outstanding design flexibility for easy selectionof appropriate operation schemes for variousapplications.
• Numerical display of setting values, currentmeasured values, memorized fault values etc.
• Continuous self-supervision with auto-diagnosis of internal faults.

Application

The combined overcurrent and earth-fault relaySPAJ 141 C is intended to be used for the selective short-circuit and earth-fault protection ofradial feeders in resistance earthed or impedanceearthed power systems. The integrated protective relay comprises both an overcurrent unit andan earth-fault unit with highly flexible tripping and signalling facilities. The feeder protection canbe used in applications requiring a single-, twoor three-phase overcurrent protection and a nondirectional earth-fault protection. 

The combined overcurrent and earth-fault relayis a secondary relay device to be connected tothe current transformers of the feeder to beprotected. The three-phase overcurrent unit andthe non-directional earth-fault unit continuously measure the phase currents and the neutral current of the protected feeder. In fault situations these units initiate external auto-reclosefunctions or trip the circuit-breaker, dependingon the selected protective scheme.

When a phase current exceeds the starting valueof the low-set overcurrent unit, the unit starts, simultaneously starting the corresponding timingcircuit. When the set operating time has elapsed,a circuit-breaker tripping command is delivered.Correspondingly, the high-set stage of the overcurrent unit starts when its starting value is exceeded, starting its timing circuit and performinga tripping when the set time has elapsed.

The low-set stage of the non-directional earthfault unit operates in the same way. Dependingon the protective scheme it either signals, performs a tripping or initiates a function of anexternal auto-reclose relay. The input circuitcomprises a low-pass filter, which reduces theamount of harmonics in the neutral currentbefore the signal is measured.

The low-set stage of the overcurrent unit may begiven definite time or inverse definite minimumtime (IDMT) characteristics. When the IDMTcharacteristic is to be chosen six curve types areavailable in the relay. Four of the curves typescomply with BS 142 and IEC 60255 and arenamed normal inverse, very inverse, extremelyinverse and long-time inverse. The two additionalcurves are named the RI curve and the RXIDGcurve. The low-set stage of the earth-fault unit isoperating on a definite time basis.

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