Overhead Line Short Circuit And Earth Fault Indicator ( SNV-308 )
Specifications
SNV fault indicators can quickly and easily indicate fault and identify fault locations, used in cable and overhead power lines.
Characteristic
The shell using high strength and high transparency aeronautical material Fully Fashioned, and treated with nanotechnology, better perspectivity. resist filth, anti-aging, without maintenance, long service life.
Built-in high performance lithium battery, Service life can reach more than eight years.
The circuit board using special chip and MCU etc imported Components.
The shell made from aeronautical material and nano materials.
The clamp with nickel plating process, best magnetic conductivity, Install and Remove with Electricity.
Fault indication turn card brush with red fluorescent paint,strong visual,it can clear instructions with light in the night, and the color not fade under sun ultraviolet light for a long time.
Function and Benefit
Indicate the fault line and fault point quickly, lessen the blackout area;
Shorten troubleshooting time,improving electricity and power supply reliability;
Accurately indicate the instant fault, which is conducive to rule out the power supply problems;
Providing technical means for find the hidden permanent fault point;
Shorten the search time to find the fault point, reduce the labor intensity of line patrol person;
Defining the responsibility of the fault area and responsible people;
Avoiding traditional multiple switch out,switch on,line patrol to the effects of power equipment.
Technical Parameters
Applicable voltage grade: U≥6-35KV
Applicable wire current: I≤1200A
Applicable wire diameter: 16mm sq≤D≤240mm sq
Action response time: 0.06s≤t≤3s
Reset time: 6,12,24,48H (Selectable, Default 24H)
Ambient temperature: -35℃≤T≤+70℃
Operation times: ≥5000Times
Static power loss: ≤10μW
Action principle
Short circuit detection principle: According to the phenomenon of short circuit,the current break when
short circuit happen, the action on the basis of the protection movement power outages.
Used to judge the short circuit fault indicator diagram:
As line 2# B phase 2,5,8 indicator and line 2# C phase 3,6,9 indicator turn red, but the 11,12 indicator still
show white, that judged the point D happen short circuit
Used to judge the grounding fault indicator diagram:
As line 2# C phase 3,6,9 indicator turn red,but the 12 indicator still show white, that judged the point D
happen grounding fault.
The experimental technical requirements:
In normal line steady current running after more than 20 seconds then mutation 1 second current back to
zero that the indicator show alarm indication.
Indicator alarm reset in a steady line current is greater than 20A,it will automatic reset within 20 seconds;
When the line current is less than 20A, the indicator will automatic reset within 48H.
Running time: ≥20S The action response time: ≤1S
Mutation current: ≥150A Reset time: 6,12,24,48H (Selectable, Default 24H)
Automatic reset current and response time: ≥20A,20S
