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.www.snovatech.com or www.snovaglobal.com.
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
If you are interested in our products ,please contact with us .
Contact:Andrew Mao
Email:@163.com or 626387134@qq.com
Mobile:0086-13570657698
Wechat :13570657698 QQ:626387134
Characteristic:
- Support for the judgement of the coincidence gate
- Accurate synthesis of zero sequence current
- Intelligent motor control card
- Ultra low power consumptinon in real time sampling
- A wave of 64 point difference sampling
- Support remote serve upgrade and parameter settings
- Accurate judgement of the grounding fault by the change of zero sequence current
- Time synchronization between the sensor and the sensor
- Optional threshold,incremental,percentage of multiple fault judgement
- Calibration of each sensor is carried out to ensure consistency of sampling
- The accurancy of the current sampling is less than 10A ±0.3A,10-2000A ± 2%
- Temperature sampling precision ± 0.5℃，Voltage precision of ground electric filed ± 10%
- Can accurantely determine the temporary fault,transient fault,permanent fault,grounding fault
- A current greater than or equal to 5A,no external power supply
- Solar electric,CT electric,a built-in 3.2V lithium iron phosphate battery and a main 3.6V liyhium battery bottom and a super capacitor
