one, the basic principle of  %d%a
short circuit principle: when the line short-circuit fault occurs, the fault current sensor to the fault current, while the signal is converted to a data signal to the host, the host panel on the two phase short-circuit fault indicator light, showing the failure of the line.  %d%a
grounding principle: the grounding part of the detection line zero sequence current as the basis for judging, when the system appears to ground fault, if the ground indicator lights on the panel, indicating that the cable system has a ground fault.

two, the main function of%d%a
1. short circuit warning: when the line short-circuit fault occurs, the current reached or exceed the short-circuit current of the setting value, the short circuit sensor sends out the alarm signal, through the optical fiber transmission to the host, the host receives this signal, generate the corresponding alarm signal. %d%a%d%a
2. ground alarm indication: when the line to ground fault current to meet or exceed the ground current setting value, the ground sensor sends out the alarm signal, through the optical fiber transmission to the host, the host receives this signal, generate the corresponding alarm signal. %d%a
3. low voltage alarm indicator: the host uses battery powered, when the battery voltage is lower than the normal working voltage, will produce a voltage alarm indicator, to remind staff to replace the battery. %d%a
4. automatic reset: when the indicator sends out the alarm signal, if there is no manual reset, to set the time, the indicator can be automatically reset. %d%a
5. manual reset: when the indicator is generated, the alarm can be lifted by the "reset / test" button on the host panel of the indicator.
6.%d%a: automatic indicator generates alarm indication signal corresponding to the alarm signal output, remote. The indicator can also receive a remote reset signal, and remote reset operation for the indicator.
7. test%d%a: indicator can be self check.

three,  %d%a
panel type fault indicator is mainly composed of two parts of the main engine and short circuit (ground) current sensor. The host is in the form of a long, wide, high =93 * 43 * 80mm, and the control cabinet is installed on the main engine and the size of the host is =91.5mm x 43.5mm. The indicator host is mounted on the front panel of the power distribution cabinet, the ground or the short circuit sensor is installed on the detected line, the sensor and the host are connected by the optical fiber. < br / >  %d%a installation steps did  %d%a a, the host with the current sensor installation: the host computer is installed in the front panel of the power distribution cabinet; short circuit current sensor installed in the ring network power supply line of a, B and C three must be tightly sheathed on the line is detected; grounding current sensor installed in have separate stripped of shielding of three-phase cable bus.  %d%a
two, host and current sensor connection: in the back of the host, a set of 16 terminal, is used to detect the fault current sensor data output signal and the host connection interface. Specific installation steps are as follows:%d%a
1. will correspond to the A phase short circuit current sensor two red data lines are connected to the interface of the 6 and 7 respectively, the other black line connected to the interface terminal row number 5. %d%a
2. will correspond to the two red data of the B phase short circuit current sensor connected to the 9 and 10 bits of the interface terminal, and the other black line is connected to the interface terminal 8. %d%a
3. will be corresponding to the C phase short circuit current sensor of the two red data lines are connected to the interface terminal row of 12 and 13, the other black line connected to the interface terminal 11. %d%a
4. will connect to the ground current sensor of the two red data lines are connected to the interface of the 15 and 16 respectively, and the rest of a black line connected to the interface terminal 14.

four, technical parameters of
1. short-circuit current alarm: = 160A + 10% error; the factory is set to 800A, 20mS
2.%d%a delay short-circuit grounding current error alarm: 8A~2000A + 10% factory set to 10A, ground delay 20mS
3. power supply: CR123A lithium battery 3.0V (valid for not less than 8 years) the standby current of%d%a
4. A: less than or equal to 5 mu
5. automatic reset time: 6h ~ 48h (factory setting 12h)
6. indicator protection grade: IP40 host IP65%d%a
7. remote sensor; 0.5A relay: the maximum 230/VAC 30V/DC 1A
8. short circuit current sensor: 20KA 4S
9.%d%a under current working environment: -40 to +75 DEG C;
10. relative temperature: = 95%; waterproof, anti acid, anti salt fog
11. use: 20kV system below the level of

five in order to know the

 , please provide the following parameters:
1. short circuit alarm starting current value
2. grounding alarm starting current value
3. automatic reset time
4. fiber length