SPCJ4D34-DA SPAJ 140 C Overcurrent and earth-fault relay
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SPCJ4D34-DA SPAJ 140 C Overcurrent and earth-fault relay
Three-phase, low-set phase overcurrent unitwith definite time or inverse definite minimumtime (IDT) characteristic
Three-phase, high-set phase overcurrent unitwith instantaneous or definite time function
Low-set, non-directional earth-fault unit withdefinite time or inverse definite minimum time(IDMT) characteristic
High-set, non-directional earth.fault unit withinstantaneous or definite time function
Built-in breaker failure protection function
Two heavy-duty and four light-duty outputrelays with field-selectable configuration
Essential details：SPCJ4D34-DA SPAJ 140 C Overcurrent and earth-fault relay
Three-phase, low-set phase overcurrent unitwith definite time or inverse definite minimumtime (IDT) characteristic
Three-phase, high-set phase overcurrent unitwith instantaneous or definite time function
Low-set, non-directional earth-fault unit withdefinite time or inverse definite minimum time(IDMT) characteristic
High-set, non-directional earth.fault unit withinstantaneous or definite time function
Built-in breaker failure protection function
Two heavy-duty and four light-duty outputrelays with field-selectable configuration
Extensive data communication capabilities overbuilt-in serial port
Outstanding design flexibility for easy selectionof appropriate operation schemes for differentapplications
Numerical display of setting values, measuredvalues, memorized fault values, fault codes etc.
Enhanced system reliability and availability dueto continuous hardware and software self-supervision with auto-diagnosis
Powerful software support for setting andparametrizing of the relay and for recording ofrelay parameters with a portable PC.
The combined overcurrent and earth.fault relaySPA] 140 Cis intended to be used for theselective short-circuit and earth-fault protectionof radial feeders in solidly earthed, resistanceearthed or impedance earthed power systems.The integrated protection relay includes a phaseovercurrent unit and an earth-fault unit with
fexible tripping and signalling facilities. Theovercurrent and earth-fault relays can also beused inother applications requiring single-, two-or three-phase overcurrent protection and non-directional earth-fault protection. The com-bined overcurrent and earth-fault relay also fea-tures circuit breaker failure protection.
SPAJ140C-AA
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sunny He
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SPCJ4D34-DA SPAJ 140 C Overcurrent and earth-fault relay
The combined overcurrent and earth.fault relayis a secondary relay to be connected to thecurrent transformers of the protected object.The three-phase overcurrent unit and the earth.fault unit continuously measure the phase currents and the neutral current of the protectedobject. On detection of a fault the relay starts,trips the circuit breaker,initiates auto-reclosingprovides alarm, records fault data etc. in accordance with the application and the configuredrelay functions.
When the phase current exceeds the set startcurrent of the low-set stage I>, the overcurrentunit starts delivering a start signal after a preset.60 ms start time.When the set operate time atdefinite time operation or the calculated operatetime at inverse time operation elapses, the over.current unit operates. In the same way the highset stage l>> of the overcurrent unit starts deliv.ering a start signal after a preset ~40 ms starttime, when the set start current is exceededWWhen the set operate time elapses, the overcur.rent unit operates.
WWhen the earth.fault current exceeds the setstart current of the low-set stage lo>, the earth.fault unit starts delivering a start signal after apreset ~60 ms start time. When the set operatetime at definite time operation or the calculatedoperate time at inverse time operation elapses.the earth-fault unit operates. In the same waythe high-set stage lo>> of the earth-fault unit starts delivering a start signal after a preset ~40ms start time,when the set start current isexceeded, When the set operate time elapses, theearth-fault unit operates.
The low-set stage ofthe overcurrentunitand thelow-set stage ofthe earth-fault unit maybe givendefnite time or inverse defnite minimum time(IDMT) characteristic. When the IDMT char-acteristic is chosen six time/current curves areavailable. Four ofthe curves comply with the BS142 and lEC 60255 and are named “Normalinverse”,”Very inverse ,”Extremely inverseand “Long-time inverse”. The two additionalinverse time curves called the “RI-curve” andthe “RXIDG-curve” are also provided.
Byappropriate configuration ofthe output relaymatrix, the start signals of the overcurrent andearth-fault units are obtained as contact functions. The start signals can be used for blockingco-operating protection relays, for signallingand for initiating auto-reclosing.
The relay includes one external binary input,which is controlled by an external control volt-age. The function of the control input is deter-mined by selector switches in the protectionrelay module. The control input can be used forblocking the operation of one or more protection stages, for resetting alatched output relayinthe manualreset mode or for enforcing a new setof relay setting parameters by remote control.
1 Year Warranty
