HIGH IMPEDANCE BIASED DIFFERENTIAL RELAY

Document Sample
HIGH IMPEDANCE BIASED DIFFERENTIAL RELAY Powered By Docstoc
					                        HIGH IMPEDANCE BIASED DIFFERENTIAL RELAY


                          87
M-HIB3                   m Two Differential levels.
                         m Programmable percentage bias.
                                                                                                                     PHASE PHASE PHASE
                                                                                                                       A     B     C

                                                                                                                    PROG/ BLOCK BR. FUNC.
                                                                                                                                          tI>
                                                                                                                                         tI>>



                                                                                                                     I.R.F. INPUT FAIL. DISAB.



                         m Through Overcurrent level.                                                                   IA 500A
                         m Harmonic restraint.
       K5     -R3        m Breaker Failure protection.
                         m Oscillographic recordings.
                                                                                                      M-LINE

                                                                                                    THREE-PHASE
                                                                                                                    MODE        SELECT           +


                                                                                                     HIGH SPEED                                  _
                         m Modbus Communication Protocol.                                           PROTECTION
                                                                                                     RELAY TYPE                 PROG.
                         m UL / CSA listed.                                                            M-HIB3




       M
                                                                                                                  ENTER/RESET

      LINE



M-HIB3 is a microprocessor relay with three high speed current measuring elements.
With the addition of proper external stabilizing resistors the relay is used as High Impedance Differential protection against
phase and ground fault.

The relay has the following features:

¤ Low-set percentage biased differential element on each phase.
¤ Adjustable second harmonic restraint level.
¤ High-set differential element with D.C. offset restraint.
¤ 2 instantaneous and 2 definite time delay elements for through overcurrent protection.
¤ Breaker Failure protection.
¤ Real time measurements.
¤ Recording of last five events.
¤ Oscillographic recording of 7 input currents.

¤ Real Time Measurements                              = IdA-IdB-IdC- IA-IB-IC
¤ Maximum Demand and Inrush Recording                 = IdA-IdB-IdC- IA-IB-IC
Programmable Input Quantities
¤ Fn = System frequency                               : (50 - 60)Hz
¤ In = Rated primary current of phase CTs             : (0 - 9999)A, step 1A
Connection Diagram




                                                                       M-HIB3




                                    AUXILIARY
                                                }
                                     SUPPLY



          C      US LISTED
                       19CN                                                       MS-SCE1643-R1                   MS-SCE1637-R2
RINA      IND.CONT.EQ.                                                            Standard Output                  Double Output

                                                               40
                                                                                                M-HIB3            M   K05-R3




1 - F87 (d>): Low-set biased differential
¤ Basic setting                                    : d> = (0.10 - 1.00)In, step 0.01In

¤ Bias Percentage                                  : R = (10 - 50)%,      step 1%

¤ 2nd Harmonic restraint                           : 2H = (0.10 - 1.00)d, step 0.01d

¤ Trip time                                        : £ 0.03s
2 - F87 (d>>): High-set differential
¤ Minimum pick-up level                            : d>> = (0.5 - 9)In,   step 0.1In with D.C. offset restraint

¤ Trip time                                        : £ 0.03s

1 - F51 (I>): Low-set Overcurrent
¤ Minimum pick-up level                            : I> = (0.5 - 8)In,    step 0.01In

¤ Trip time delay                                  : tI> = (0.05 - 9.99)s, step 0.01s

¤ Instantaneous                                    : £ 0.03s
2 - F51 (I>>): High-set Overcurrent
¤ Minimum pick-up level                            : I>> = (0.5 - 8)In,   step 0.01In

¤ Trip time delay                                  : tI>> = (0.05 - 3.00)s, step 0.01s

¤ Instantaneous                                    : £ 0.03s

Digital Inputs
¤ B1 = Function blocking                           : d>, d>>

¤ B2 = Function blocking                           : I>, I>>

¤ B3 = External Trigger

Real Time Measurements
¤ Differential Current phase                       : dA - dB - dC
¤ Through Current phase                            : IA - IB - IC

Inrush Recording
¤ Differential Current phase                       : dA - dB - dC
¤ Through Current phase                            : IA - IB - IC

Oscillography
8 pre fault and 8 post fault cycles of 7 input currents.

Breaker Failure Element
¤ Trip time delay                                  : tBF = (0.05 - 1.00)s, step 0.01s




                                                                  40