ALCL-40 Digital Arrester Clamp Tester
37mmφCT, AC leakage current/harmonics
THE MOST PRECISE LEKAGE CURENT CLAMP TESTER IN THE WORLD
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
Features
- 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 |
