Inverse Time (59NIT)
It will be advantageous to map the function being tested to temporarily drive the relevant pickup output in the
Pickup Config
sub-menu in the
Output Config
menu as this will allow the
Pickup
LED to operate for
the function.
Gradually increase voltage until
Pickup
LED operates.
Apply 2 times setting voltage and record operating time.
Apply a higher multiple of setting voltage and record operating time.
Compare to calculated values for operating times from:
[fo_function59N, 1, en_US]
Where Tm = Time multiplier and V
rated
/V
set
= multiple of setting.
Phase
Setting
(Volts)
Tm
Operate Voltage
Operate Time
P.U.
(Volts)
D.O.
(Volts)
Tolerance @ 2 ⋅ V
set
(s)
@ - ⋅ V
set
(s)
Tolerance
E
Element Blocking
The
Neutral Overvoltage
elements can be blocked by
Binary Input Inhibit
. This functionality
should be checked.
Element
BI Inhibits
59NIT-1
59NDT-1
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.
59Vx Overvoltage Protection – Vx
59Vx elements operate similarly to the 59 elements above but are applied to the fourth voltage input Vx.
Where more than one 59Vx undervoltage elements are being used with different settings, it is convenient to
test the elements with the highest settings first. The elements with lower settings can then be tested without
disabling the lower settings.
Single phase voltage should be connected to the Vx input directly. If the DTL is short, starting from nominal
voltage, slowly increase the applied test voltage until the
Pickup
LED (temporarily mapped) is on. Record the
operate voltage. The LED should light at setting
Volts
±5 %. Slowly decrease the input voltage until the LED
extinguishes. Record the reset voltage to check the
Hysteresis
setting. If the DTL is long, the operate level
should be checked by applying a voltage of 110 % of setting voltage. Check hysteresis by resetting element to
the operate level setting minus the
Hysteresis
setting. Connect the relevant output contact(s) to stop the
test set. Step the applied voltage to a level above the setting. The test set should be stopped at the operate
time setting ±5 %.
When testing is complete reinstate any of the disabled functions.
Setting
(Volts)
DTL (sec)
Hyst.
D.O. (calcu-
lated)
P.U. Volts
D.O Volts
Op. Time @
1.2 ⋅ V
set
(OV)
Tolerance
Check correct indication, trip output, alarm contacts, waveform record.
9.10.18
Functional Tests
9.10 Protection Functional Tests
442
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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