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ND10 LOW IMPEDANCE RESTRICTED DIFFERENTIAL EARTH FAULT. PROTECTIVE FUNCTIONS. 50/51 Phase overcurrent 50N/51N - 87NHIZ. Residual overcurrent or high impedance restricted differential ground fault 64REF Biased restricted differential ground fault BF Breaker Failure.

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Presentation Transcript
slide1

ND10

LOW IMPEDANCE RESTRICTED DIFFERENTIAL EARTH FAULT

slide2

PROTECTIVE FUNCTIONS

  • 50/51 Phase overcurrent
  • 50N/51N - 87NHIZ. Residual overcurrent or high impedance restricted differential ground fault
  • 64REF Biased restricted differential ground fault
  • BF Breaker Failure
slide3

64REF – MOST COMMON APPLICATIONS

  • Like every differential protective function 64REF is largely adopted in case of high selectivity needs.
  • Common applications are generator protection and transformer protection.

G

~

64REF

64REF

slide4

BEFORE ND10 – 87NHIZ ONLY

STABILIZING RESISTOR

  • SEVERAL CONS
  • Design
  • Large cubicle
  • Connections
  • Low liability
  • External devices

NAXX

3 CT’s

Low leakage reactance type according to IEC Class PX, TPS or BS Class X

87N

METROSIL

50 51

3 CT’s

Phase Currents

EXPENSIVE SOLUTION

slide5

ND10 – ONE DEVICE ONLY

CT

Residual current

ND10

50 51

3 CT’s

Phase Currents

CHEAPER SOLUTION

slide6

ND10 – 64 REF LOW IMPEDANCE FROM SAME INPUTS

  • Separate inputs for phase current and current from earth connection.
  • Earth overcurrent and biased restricted earth fault protective functions both contemporaneously performed.
  • Phase overcurrent protective function from same 3 CT’s set.

ND10

64 REF

50N 51N

50 51

RELIABLE SOLUTION

slide7

ND10 – MANY ADVANTAGES

  • Biased 64REF is internally calculated.
  • Easy connections.
  • RS and METROSIL design is not required.
  • No one external device is needed for stabilization.
  • Smaller cubicles.

ND10

64 REF

50N 51N

50 51

EASIEST SOLUTION in case of EARTH FAULT DIFFERENTIAL FUNCTION

slide8

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