10
JEP0-IL9558
Operating Description
1. Protection function
①
The power supply can be derived from VT secondary.
②
Set using condition switches according to your
using condition (frequency and output contact).
③
Zero-sequence voltage input is supplied from
secondary output of MPD-3 type ZVT combined with
the relay.
④
If input zero-sequence voltage is greater than or
equal to the setting value, the operation timer
starts. The relay actuates the output contact and
operation indicator after a preset time of the
operation timer.
⑤
After the relay operation, if input zero-sequence
voltage falls below the setting value, the output
contact will be in the state set by the using
condition setting switch (auto-reset or self-hold).
The operation indicator keeps the operation status
(orange color). To reset the indicator, move the
reset lever up and down.
2. RUN display (Self-monitoring function)
This relay monitors control voltage, electric
circuit, and program data at all time. The RUN LED
(green) lights up in the normal condition.
In the abnormal condition, the RUN LED goes out and
the error message
Ｅ ｒ ｒ
is displayed on the
numerical display LED, with the output contact
locked.
3. Numerical display function
By switching the position of the indicator select
switch, following items can be displayed on the
numerical display LED.
①
V
0
voltage measurement
The display shows the value of zero-sequence
voltage. The display range is from 1.0% to 40%.
(If input voltage is less than 1.0%, the display
goes out. If input voltage is more than 40%, the
error message
Ｏ
.
Ｆ
. is displayed.)
Here, "100%" denotes complete single-phase fault
in 6.6kV power systems: V
0
primary = 3810V, ZVT
secondary = 7V.
This function makes it possible to measure the
residual V
0
voltage in sound condition.
②
Pickup
When input zero-sequence voltage is greater than
or equal to the setting value,
Ｕ
. is displayed.
This function can be used for operation value tests.
③
Setting value
It displays the setting condition of the relay
including V
0
value and operating time setting.
④
Frequency setting
It displays the setting condition of frequency in
accordance with the setting switch of SW1.
⑤
Output contact setting
It displays the setting condition of output contact
in accordance with the setting switch of SW2.
The setting is self-hold, the display shows
Ｈｏ
..
The setting is auto-reset, the display shows
ＦＵ
..
4. Fault record function
①
Display of fault records
When a fault occurs, the relay outputs the
operating signal, and at the same time the input
value of zero-sequence voltage is recorded. When
the indicator select switch is set to the position
of fault record, the records are displayed starting
from the latest record to the oldest one at
approximately 2 second intervals. The relay can
save the newest five phenomena.
The records are saved in the non-volatile memory,
therefore the records can be read again after
shutting the power off.
Note that the fault record may not be saved if the
auxiliary power supply is turned off soon after
the relay operation.
②
Clearing of fault records
Set indicator select switch to "CLEAR FAULT REC."
and hold for 5s or more, then
Ｏ
.
Ｋ
. is displayed
and all of the fault record are cleared.
5. Display function of setting change
When a setting is changed, the setting value after
changing is displayed for approx. 3s preferentially.
