Commissioning: Undercurrent [Ansi 37] - Woodward HighProTec MRM4 Traducción Del Original

I<
I< = I<[1]...[n]
Consulte el diagrama: Bloqueos
(La etapa no está desact. y no hay señales de bloq. act.)
4
I< .
Modo alar.
cualquiera
td.
IL1 RMS (Ib)
IL2 RMS (Ib)
IL3 RMS (Ib)
Consulte el diagrama: Bloq descon
(Comando descon. desactiv. o bloqueado. )
3
4.7.1

Commissioning: Undercurrent [ANSI 37]

Object to be tested
• Testing the pick-up value for Undercurrent protection
• Testing the trip delay
• Testing the fallback ratio
Necessary means
• 3-phase current source
• Amperemeter
• Timer for measuring of the tripping time
Procedure
Testing the threshold values( single-phase, three phase)
Feed in a testing current significantly greater than the pick-up value.
For testing the threshold values and fallback values, the test current has to be decreased
until the relay is energized. When comparing the displayed values with those of the
ammeter, the deviation must be within the permissible tolerances.
Testing the trip delay
For testing the trip delay, a timer is to be connected to the contact of the associated trip
relay. Feed in a testing current significantly greater than the pick-up value, the test
current has to be decreased suddenly below the threshold value. The timer is started
when the limiting value of the tripping current falls below the threshold and the operating
time is elapsed and it is stopped when the relay trips.
Testing the fallback ratio
MRM4-3.7-ES-MAN
≥1
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Infracorriente
&
MRM4
4.7.1 Commissioning: Undercurrent [ANSI 37]
&
≥1
&
&
◄
I< .
t
t 0
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4 Elementos de protección
UnderLoad_Y01
I< . Alarm
I< . Desc
&
I< . CmdDes
14
15
15a
237