Arcteq AQ-M255, Инструкция по эксплуатации

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Table. 5.3.15 - 142. General settings of the function.
Name Range Step Default Description
df/dt >/< LN
mode
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
- 0: On
Set mode of DFT block.
This parameter is visible only when Allow setting of individual LN
mode is enabled in General menu.
Max allowed
df/dt rate
0.10...50.00Hz/
s
0.10Hz/
s
20Hz/s If df/dt rate exceeds this setting, the function is blocked.
df/dt >/< (1...8)
enable
1: No
2: Yes
- 1: No Enables or disables the stage.
Pick-up and time delay
The df/dt>/< (1) pick-up, df/dt>/< (2) pick-up, etc. setting parameters control the pick-up of each stage
of the df/dt>/< function. They define the maximum or minimum allowed change of frequency before
action from the function. The function constantly calculates the ratio between the pick-up setting and
the measured df/dt>/<. The reset ratio of +/- 100 mHz/s is built into the function and is always
relative to the pick-up value. The f>/< limit value is used to block the funtion from operating near the
nominal frequency.
Table. 5.3.15 - 143. Pick-up settings.
Name Description Range Step Default
df/dt>/< (1…8)
used in setting
group
Enables the protection stage in setting group.
0: No
1: Yes
- 0: No
df/dt>/< (1…8)
operating mode
Defines the operation mode of the protection stage. In "Rising"
mode df/dt function can trip only from increasing frequency. In
"Falling" mode df/dt function can trip only from decreasing
frequency. "Both" allows df/dt to trip from both.
0: Rising
1: Falling
2: Both
- 0: Rising
df/dt>/< (1…8)
frequency limit
Displays if frequency limits are used or not.
0: Not used
1: Use f limit
-
0: Not
used
df/dt>/< (1…8)
pick-up
Pick-up setting. 0.01…10.00Hz/s
0.01Hz/
s
0.2Hz/s
df/dt>/< (1…8)
f< limit
Underfrequency limit. Tripping is permitted when measured
frequency is under this value. This parameter is visible only when
operation mode is set to "Falling" or "Both".
7.00…65.00Hz/s
0.01Hz/
s
49.95Hz/
s
df/dt>/< (1…8)
f> limit
Overfrequency limit. Tripping is permitted if measured frequency
is above this value. This parameter is visible only when operation
mode is set to "Rising" or "Both".
10.00…70.00Hz/s 0.01Hz/
s
51Hz/s
df/dt>/< (1…8)
operating time
Operation time delay. 0.000...1800.000s 0.005s 0.1s
The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
Operating time characteristics for trip and reset
This function supports definite time delay (DT). For detailed information on this delay types please refer
to the chapter "General properties of a protection function" and its section "Operating time
characteristics for trip and reset".
A AQ Q-M255 -M255
Instruction manual
Version: 2.06
168 © Arcteq Relays Ltd
IM00020