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Xtester-TQ-J4-Overhead High Voltage live line Fault Indicator,Overhead cable type grounding short circuit addresser
◆ Fault indication: During normal operation, the window is displayed in white; when a short circuit or ground fault occurs, the window is displayed in red , flipping cards during the day and glowing at night .
◆ On-line operation: Directly installed on the line, maintenance-free.
◆ Strong anti-interference: The signal is not affected by lines, excitation inrush current, high-order harmonics, current fluctuations, and cable distributed capacitance bypass.
◆ Auto reset: After the action is flipped, it will reset automatically according to the set time or reset by electric shock. (Reduce labor of maintenance personnel)
◆ On-line loading and unloading: live loading and unloading is extremely simple and does not affect the line operation.
Short circuit fault criterion of overhead line
( l ) I t ≥ 80A I t is the starting value of the sudden change current (special current can be customized)
( 2 ) △ I ≥ 0.5I 0 △ I is the current change rate, and I 0 is the line current before the short circuit
( 3 ) I = 0 I is the current after line fault
( 4 ) 0.02s ≤△ T ≤ 3s △ T is the current mutation time
Ground fault criterion of overhead line
The principle of short-circuit fault in the four- grounding short -circuit is the same as that of TQ-J2 . The principle of grounding detection: sampling the first half-wave of the capacitor current at the moment of grounding and the first half-wave of the voltage at the moment of grounding, compare their phases, when sampling the capacitance at the moment of grounding If the current suddenly changes and is larger than a certain value, and is in phase with the first half-wave of the voltage at the moment of grounding, and at the same time the voltage of the wire to the ground decreases, it is judged that the line is grounded, otherwise the line is not grounded. Schematic diagram of fault indication for judging grounding:
By the indicator of 3 , 6 and 9 of phase C of 2# line turning the red card to display and the indicator of 12 is still white, it can be judged that the ground fault at point D has occurred .
■ Technical indicators
◆ Applicable voltage level: 110KV ≥ U ≥ 6KV(Customize:400V )
◆ Applicable wire current: I ≤ 1000A
◆ Applicable wire diameter: 25mm 2 ≤ d ≤ 500mm 2 (overhead bare wire, overhead insulated wire )
◆ Action response time: 0.02S ≤ T ≤ 3 S
◆ Static power consumption: ≤0.5μw ( basically zero power consumption after product action , to ensure product service life )
◆ Action reset time: 6 , 12 , 18 , 24 hours optional (labor saving)
◆ Ambient temperature: - 35 ℃≤ T ≤ +75 ℃
◆ Ambient humidity: < 100%
◆ Number of actions: ≥6000 times
◆ Product weight: ≤ 400g
◆ Service life: ≥8 years
◆ Protection level: IP67
◆ Earthquake resistance: the ground horizontal acceleration is 0.3g , the vertical acceleration is 0.15g , and the safety factor of 3 sine waves is 1.67 at the same time.
◆ Dirty level: Level IV
◆ Withstand short-circuit current capability: 40KA/2s
◆ Display mode: flop and flash display can be observed within a 360-degree range
◆ Working power: 3.3V/2.8ah
◆ Altitude: < 3km
■ Application range
◆ It is installed in the middle section of long line and at the entrance of branch, which can indicate the fault section and branch of the line.
◆ Installed at the outlet of the substation, it can be determined whether the fault is caused by the user.
◆ Installed at the user's distribution transformer inlet line, it can be determined whether the fault is caused by the user.
◆ It is installed at the connection between the cable and the overhead line, which can distinguish whether the fault is in the cable section .
■ Installation tools
The bottom right of the picture shows the installation tools from TQ-J1 to TQ-J5 . The specific installation method only needs to place an insulating rod at the bottom of the installation tool,
unscrew the bolt of the indicator and put it into the installation tool, and then put the indicator card into the installation tool. The installation is successful when it is inserted into the cable .