EKL4 short circuit and ground fault indicator
1- Detailed introduction:
The EKL4 short circuit and ground fault indicator is
mainly used in various ring main unit switchgears, high voltage switch cabinets
and cable branch boxes of power systems. Accurate and reliable detection of
faulty sections and fault types in the grid is important to improve the
operation level of the distribution network and the efficiency of accident
handling. Its design uses electromagnetic induction, photoelectric conversion,
signal transmission and single-chip control technology to make the fault alarm
with high accuracy and strong anti-interference ability.
2- working principle:
The ground fault is judged by detecting the
zero-sequence current of the line as the judgment basis, and the short-circuit
fault is used as the judgment basis for detecting the line current overflow,
which is displayed by the indicator light on the reading meter. The meter is
mounted on the front panel of the power distribution cabinet, and the ground or
short-circuit sensor is mounted on the cable. The sensor is connected to the
meter via fiber optic wire. The grounding indicator on the panel illuminates to
indicate a single-phase ground fault; the short-circuit indicator on the panel
illuminates to indicate an interphase short-circuit fault or an indirect
short-circuit fault.
3- Features:
Adaptation range: Installed on the panel of
ring main unit switchgears, branch box and substation
cabinets. It consists of a master device, three short-circuit sensors, and a
grounding sensor.
Working principle: When the line and zero
sequence current reach set value, the short circuit and grounding sensor will
upload the obtained fault signal to the main control device through the fiber
optic cable, and the short circuit and grounding indicator will flash alarm.
Automatic reset must meet two
conditions;
Reset mode: cumulative time after
A after an operation cumulative
time = Default setting
B lines to restore power
Operation and maintenance: press the “Test” button
(≥3s) during maintenance, all the indicators on the panel flash normally.
Way of handling: split core CT installation,
quick and convenient
Indication mode: red light source flashing
indication
4- Technical Parameters:
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Ambient temperature:
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35°C~+75•c
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Relay capacity:
|
230VAC~2A
|
|
Ambient humidity
|
≤ 8 5 %
|
Short circuit alarm current
|
≧150A continuously adjustable (factory setting)
|
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Pollution level:
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Level one
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|
|
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Protection level:
|
JP40
|
|
|
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Automatic reset time:
|
5s-27h continuous release (factory setting)
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Grounding alarm current
|
≧10A continuously
adjustable (factory setting)
|
|
Line voltage level
|
below 20kV
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Accuracy
|
Full temperature range error
<±10%
|
|
Power consumption
|
standby operating current 3uA
Alarm working current ζ1mA
|
Trigger time length
|
20~300ms adjustable (factory
setting)
|
|
Battery capacity:
|
3 .6V; working life is not less than 8 years
|
Withstand current capability
|
≧20kA2s
|
|
|
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Applicable cable outer diameter
|
Single core ≤ 40mm
|
|
|
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Single set weight
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<1000g
|
|
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Size:
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92X44mm
|
Installation size:
size
of the instrument (right), Installation opening slot size (left)
