SNV-EKL4 V2.1 Earth Fault Indicator for MV Power Distribution Network

SNV-EKL4 v2.1 Earth fault and short circuit indicator

Type: cable type,surface mounted,battery 19000mHA

Description

 SNV-EKL4 v2.1, Earth fault and short circuit 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 and short circuit 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 consumption 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.

Function character：

1) Intelligent detection of ground fault and through the corresponding LED (I0),on the display unit to indicate fault.

2) Intelligent detection of short circuit fault of phase to phase and through the corresponding LED (L1, L2,L3),on the display unit to indicate fault.

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

4）The pulse width time of fault current (Response time) can be set to prevent incorrect fault indication caused by surge current through modbus of RS485 port.

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 change the reset time after fault happen through Modbus of RS485 port. (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 (40/50/60/70/80/100/120/250A) 

Tripping current(350/400/450/500/550/600/650/700A),8-level can be settable through a DIP switch inside of the display unit.(optional).

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) Support AC/DC power input, AC48-240V.

14) Support Automatic Low voltage reset, AC>30V.

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, then the earth fault sensor send a signal to display unit  through electric cable. And the display unit will display the alarm signal, at same time, the earth fault LED will be blinking.

2) Short circuit indicating:  when the short circuit sensor detected an over current, and the current is bigger than equal to or equal to the setting value, then the short circuit sensor send a signal to display unit  through electric cable. And the display unit will display the alarm signal, at same time, corresponding LED (L1, L2,L3) will be blinking to indicate the fault.

3) Battery low voltage alarm indicating: the display unit use the battery to supply power. When we press the “Test” button,3seconds time: If the battery voltage is lower than the working voltage Min.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 “ reset/test” in a short time to reset it.

6)Automatic Low voltage reset: Through inputting AC30-240V power to the pin 14,15 on the PCB in the display unit, when indicating fault, 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 14,15.8) Remote(Scada) reset/test: through short connect the pin 12,13 then indicator will be run the reset/test process, and Led will be blinking.

*Connect the pin 12,13 by short time(1second), then it will be reset indicator.

* connect the pin 12,13 by a long time(3seconds), then it will be test indicator.

9）Remote indicating:  Through connect the pin 16,17 to the external lamp , then it will be indicate fault when any phase alarm fault. 

10）Remote to SCADA system by Modbus: connect pin 18 (A), 19 (B).

Define and connect of terminal inside box.

Pin 1-2:  L1, Short circuit sensor connect,   CT L1

Pin 3-4:  L2, Short circuit sensor connect,   CT L2

Pin 5-6:  L3, Short circuit sensor connect,   CT L3

Pin 7-8:  I0, Earth fault sensor connect,     CT I0

Pin 9-10: NC relay ,

Pin 9-11: NO relay

Pin 12-13 : Remote Reset/ test.( connect 1second for Reset; 3second for Test)

Pin 14-15: power supply(AC110-240V), and voltage reset (AC30-240V)

Pin 16(-)-17(+): External indicating LED

Pin 18-19: Modbus communicate with SCADA system of PC.

Operation description

1) Test:   Before installation, press the display panel’s “ reset/test “ button, 3 second. Then the indicator will go into the self- checking state:

--Battery Level voltage led flash 1 times, (if the battery low voltage, it flash 5 times);

-- Fault indicating led flash, after 10 second, display unit will recover back the normal state. Or shortly press the “ reset/test” button to finish the self-checking state.

2) Clean Alarm:  After fault indicating, when we solve the line or device problem, we can reset the indicator to Clean alarm as below three way:

1.  shortly press the “ reset/test” button to clean alarm,

2.  remote (scada) reset through connect Pin 3,4 by scada or key-switch control

3.  wait it automatically reset after reset time setting value.

4.  Voltage reset: when display unit voltage OFF , then voltage ON again.

Note: in order to use this Voltage reset feature, the 110-240Vac voltage must disappear when the fault occurs, i.e. it must be cut off by the MV circuit breaker that breaks the faulty line, otherwise the EFI will not operate voltage reset.

Working characteristics:

When the Earth line occurs fault current, and the fault current is above than the trip current level,and fault current is running a delay time above that “response time” level. Then indicator will be indicating fault. After a “reset time” EFI will be reset automatically.

Installation

1) Dimension and installation:

   Display unit outside size: 192x90x60mm

Surface mounted on the wall or cabinet bolts M4. Hole distance position: 50mm x 178mm.

Cable gland (M20x1.5): fit for 6-12mm cable.

1) sensor installation

First uninstall one screw off sensor, then install sensor cross through the cable, and screw on again.  Then use zip-belt to fixed sensor with cable.

About Earth fault sensor need to round the 3 phases cable conductor together (if have phase N,then directly mounted on phase N cable). And tighten it with belt, and the cable grounding line must insert back the sensor, and tighten it avoid the loose and fall down. As below:

Fault indicator packing list

1. Display unit            1Pcs

2. Earth fault sensor with  7meters cable   1Pcs  

3. Short circuit sensor with  7meters cable  3pcs

4. User manual           1Pcs

5. SNV-Lamp3, External Lamp(Optional)   1pcs