We specialize in Current Sensors, CT Sensors, and Measuring Instruments.

Digital Arrester Tester

ALCL-40L Digital Arrester Clamp Tester37mmφCT, AC leakage current/harmonics

Leakage and Harmonics Current Measurements For Arrester


ALCL-40 is designed to test the diagnostic of OXIDE SURGE ARRESTER.
The least influence from the external magnetic field and noise by triple shielding for CT.
Compliant with IEC6099-5.
Enabled the measurement for 100nA resolution and harmonics current.
Motor operation for opening/closing of the jaw with extensional ABS glass fiber insulation rod.

Lightning arresters are designed to protect a power distribution system by shunting to ground the high voltage surges caused by lightning.
ALCL-40L measures to warn that an arrester is damaged or deteriorated and should not be energized.
CT Sensor
CT φ37mm
Opening/closing of the jaw Motor operation
Withstanding voltage AC 2300V, 1 minute (Between the core of CT and CT outer case)
Measuring and Display Unit
Measuring function Leakage current, Harmonic current(Fundamental and third harmonics)
Measuring method Dual slope integration mode
Measuring range AC 0-300μA/3mA/30mA(3range manual)
Input frequency 45-60Hz(Fundamental frequency)
AC conversion AC coupled true rms responding
A/D conversion Dual slope integration mode
Display LCD Max. 3200 count
Sampling rate 2 times/sec
Over indication "OL" mark on LCD
Low battery Indication "Low" mark on LCD
Data hold function "DH" mark on LCD
Auto power off Approx.10 minutes later after power on
Power supply AA size Alkaline battery × 4
Limitation of circuit voltage Less than 500V AC
Operating Temperature 0~40℃, less than 80%RH, w/o condensation
Storage Temperature -10~60℃, less than 70%RH, w/o condensation
Dimensions 160(W)×950(L)×84(D)(When retracted)
160(W)×2680(L)×84(D)(When stretched)
Weight Approx. 2.6kgs
AC Current
Accuracy (23℃±5℃, less than 80%RH)
Range/Resolution/Accuracy(45~65Hz) */Max.Input Current
300μA/100nA(0.1μA)/1.2%±8digit/40A rms
3mA/1μA(0.001mA)/1.2%±8digit/40A rms
30mA/10μA(0.01mA)/1.2%±8digit/40A rms
* Accuracy specified: More than 4% harmonics are necessary against fundamental harmonics
Harmonic Current Measurement (Fundamental and third harmonics)
Measuring method Automatic turned filter
Minimum fundamental input More than 3% of full scale in each range
Accuracy (1%±5digit)±(Basic accuracy of ACA)
-(Error by neighboring harmonics)
Accessories Soft case:1
Instruction manual:1