ZBL-L Mine low voltage leakage protection device Brief
ZBL-L Mine low voltage leakage protection device uses a modern design technology leakage
protection device, compared with the same type of product safety performance good economic
advantages, ZBL-L mine low voltage leakage protection device is suitable for coal mine methane
and coal dust with a dangerous place, as a low voltage 380V ~ 1140V ungrounded system leakage protection.
ZBL-L Mine low voltage leakage protection device Parameters：
●Power supply: control voltage.
●bus segment number：1。
●Number of branches: 9. Installed in the second stage (the branch switching transformer and with certain
provisions under the shunt switch), the branch number is 8.
●Mine low voltage leakage protection device action resistor values and latching action resistor values：
voltage level: 380伏 660伏 1140伏
action resistor values 3.5K±20% 11K±20% 20K±20%
latching action resistor values 7K±20% 22K±20% 40K±20%
●Action time: branch export time 30 milliseconds; Total exports time 300 milliseconds. Can be arbitrarily set.
●Ability to adapt to changes in the power supply: Power supply change in the rating of 75% to 110%, the
resistance value of the device leakage action, leakage blocking resistance value and operating time of the
error is less than 20%.
●Low voltage system capacitance change adaptation: When the system capacitor 0.1μf ~ 1μf range of changes,
the device leakage resistance movement, leakage blocking resistance value and operating time of the error is
less than 20%.
●Dispersion leakage resistance resolution: Action resistor setting value 20% +2 K.
●Relay export output: total exports and exports into the line corresponding to one, are normally open dry
contact, contact capacity 1A; 380VAC.