Distribution automatiom grounding fault indicator

Distribution automatiom  grounding fault indicator

Type: LCD display

Note:

SNV-EFI3.0: LCD Display unit, with SNOVA CT ;  SNV-EFI3.1:  LCD Display unit with Rogowsky CT.

Description

 SNV-EFI3.0 Earth fault indicator, it Widely used in various ring cabinets, high/ Medium or low -voltage switch gear and cable branch box in power system, can accurately and reliably detect the fault section and fault type of power grid in the Low/medium voltage network. The use of cable type grounding fault indicator is an efficient way to check cable fault, and is an effective way to improve the operation level of distribution network and the efficiency of fault handling. The design uses electromagnetic induction, and single chip microcomputer control technology to make fault alarm with high accuracy and strong anti-interference ability.

Equipped with fault remote transmission port, suitable for distribution network automation;  Battery low power alarm indication; Low-power design, high-capacity lithium battery power supply, long battery life (more than 10 years); external structure using card or lock design, the whole machine is easy to load and unload.

Outlook:

Function character：

1) Intelligent detection of ground fault and through the corresponding LED on the display unit to indicate fault.

2) LCD screen display the grounding current on time.

3）Display unit designed with button, it is convenient for reset or test.

4）The pulse width time of fault current (response delay time) can be set to prevent incorrect fault indication caused by surge current.

5）It can reset and detect the remote fault indication device remotely by SCADA or press key.

6）It can provide switch volume for external devices through remote contact.

7）It can choose the reset time after fault happen (when purchase, it need to tell factory to set,default 8hours).

8）Remote fault indicating can be made by external lamp.

9）Earth fault alarm current,Multi-level can be settable via LCD buttons.

10）Low battery display and alarm test through press the “Test/reset” key by 3seconds.

11) Battery can be changeable conveniently, Big capacity 19000mHA,D- Size, ER34615.

12) Sensor cable spec: NYAF,copper cable,(2x1.5? ) ,7 meters length.

13) 25-levels tripping current: From 10A to 250A, interval 10A, can be settable on LCD

14) Reset time adjustable: from Min. 1H up to 200H on LCD. Interval 1H.

15) Response delay time adjustable: from Min. 10ms up to 1000ms. Interval 10ms

Function description

1) Earth fault alarm indicating:  

when the earth fault sensor detected an earth fault current, and the current is bigger than equal to or equal to the setting value and the fault current flow time is over the response delay time,  then Indicator will display the alarm signal, at same time, the earth fault LED will be blinking.

2) Battery low voltage alarm indicating: the display unit use the battery to supply power. When we press the “R/T” button,3seconds time: If the battery voltage is lower than the Min. working voltage 2.5V, then the Battery Level Led will be blinking 5 times; If battery voltage is normal, then only blink 1 times.

4)Automatic time reset:  After the indicator alarm the fault, if there are without manual reset it, when the time reach our reset time setting, indicator will automatically reset.

5) Manual reset:  After the indicator alarm the fault, user can press the button “ R/T” in a short time to reset it.

6)Automatic Low voltage reset: Through inputting AC30-240V power to the pin 10,11 on the PCB in the display unit, when fault indicating, at same the voltage powered off. when the voltage recover and power on again,  then indicator will be reset immediately via low voltage.

7) Out side AC110-240V power supply energy for display unit. It use the same as voltage of the “voltage reset” via pin 10,11.

8) Remote(SCADA) reset/test: through short connect the pin 3,4, then indicator will be run the reset/test process, and Led will be blinking.

    *Connect the pin 3,4 by short time(1second), then it will be reset indicator.

    *Connect the pin3,4 by a long time(1.5 ~3seconds), then it will be test indicator.

9)Remote indicating:  Through connect the pin 5,6 to the external lamp , then it will be indicate fault when any phase alarm fault. 

Character list