ALCL-40 Digital Arrester Clamp Tester

ALCL-40 Digital Arrester Clamp Tester

37mmφCT, AC leakage current/harmonics


Generally, it is said that the metal oxide surge arresters in high voltage lines should be replaced within 15 years after the start of use under the normal conditions:
Of course, the duration of arresters would be shortened by various causes like as direct surge attack, internal abnormal voltage, vibration & shock to outer pole component, etc. and the regular & adequate inspections are required in order to avoid serious accidents in high voltage distribution networks.
In European standard IEC60099-5 Section 6 “Diagnostic indicators of metal-oxide surge arresters”, the following inspection methods are introduced:
*Fault Indicators *Disconnectors *Surge Counters *Monitoring Spark Gaps Temperature Measurements
*Insulation Resistance Measurements *Leakage Current Measurements (Capacitive, Resistive, Harmonics, etc.)

Application field:
This model ALCL-40 mainly measures very small leakage current of grounding line connected with Arrester, etc. The CT which is applied to this model is hardly affected by external magnetic field and therefore, model ALCL-40 can measure leakage current very accurately in high magnetic and electric field

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  • 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 of CT.
  • Compliant with IEC6099-5.
  • Enabled the measurements for 100nA resolution and harmonics current.
CT Sensor
CT φ37mm
Opening/closing of the jaw Spring operation
Withstanding voltage AC2200V, 1 minute between the core of CT and CT outer case
voltage CT outer case
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 PLL method
Minimum fundamental input More than 3% of full scale in each range
Accuracy (1%±5digit)±(Basic accuracy of ACA)
-(Error by neighboring harmonics)
* Accuracy specified:More than 4% harmonics are necessary against fundamental harmonics
Accessories Soft case:1
Instruction manual:1
Measuring and Display Unit
Measuring function Leakage current, Harmonic current (Fundamental and third harmonics)
Measuring method CT clamp sensor
Measuring range 0-300μA/3mA/30mA(3range manual)
Input frequency 45-60Hz
AC conversion AC coupled true rms responding
A/D conversion Dual slope integration mode
Display LCD 3200 count max
Sampling rate 2 times/sec
Over indication “OL” mark on LCD
Low battery Indication “B” mark on LCD
Data hold function “DH” mark on LCD
Auto power off Approx.10 minutes later after power on
Power supply 9V Alkaline battery 6LR61 × 1
Power consumption Approx. 20mW
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 and Weight Unit:/95(W)x160(H)x34(D)mm, 260gs
CT:/135(W)x166(H)x61(D)mm, 1000gs
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