Digital I0r Leakage Current Clamp Tester. Model MCL-400IR [MEASURING INSTRUMENTS

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AC clamp leaker

AC clamp leaker
(for AC leakage current)

Digital I0r Leakage Current Clamp Tester

PRODUCTS

I0r Leakage Current

Model MCL-400IR

About I0r Leakage Current

Recently, the leakage current clamp meter is widely used for insulation control of low voltage circuit as the supplementary method of the insulation resistance measurement. The control of leakage current has the advantages to enable the prediction of insulation condition in the electrical power line without having to shut off the power. The leakage current (I0) includes the capacitive leakage current (I0c)originated in the capacitance and the resistive leakage current (I0r) originated in the insulation resistance each related to the ground. It is considered that the measurement of resistive leakage current (I0r) is the very useful and effective method for the insulation control of low voltage circuit. However, it was difficult to measure the resistive leakage current (I0r)with traditional leakage current clamp meter. MCL-400IR new digital clamp tester enabled the measurements of the resistive leakage current (I0r)without voltage input(phase detection).

left:Current waveform with harmonics/right:Vector of leakage current

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DETAIL

SPEC

SPECIFICATIONS

Measuring function

Load current, leakage current (I0)
Resistive leakage current (I0r)
Harmonics current and voltage
(Fundamental, 3rd, 5th, 7th, 11th and 13th)
AC Voltage

CT opening capability

φ40mm

Influence of external magnetic field

Less than 5mA (nearby 100A conductor)

Withstanding voltage

AC 2200V, 1minute

Measuring Range

AC 0-40mA, 400mA, 4A, 40A, 300A,
AC 0～500V

Input Frequency

45-65Hz

Measuring method

Dual slope integration mode

AC conversion

Average sensing rms reading

Display

3.5 digit LCD, max. reading of 4000

Sampling

2 times/sec, 1 time/6 sec. for Ior measurement

Over range indication

"OL" mark on LCD

Low battery indication

"Battery mark" on LCD

Data hold indication

"DH" mark on LCD

Auto power off function

Approx. 10 minutes later after final key operation

Power supply

1.5V ("AAA" sixe, um-4)x3 or AC adaptor (Option)

Power consumption

Approx. 8mA (Approx. 60 hours continuous)

Limitation of circuit voltage

Less than AC 500V

Operating temperature

0℃~40℃, < 80%RH ( Without condensation )

Storage temperature

10℃~60℃, < 70%RH ( Without condensation )

Size and weight

70(W)x223(H)x34(D)mm
Approx. 440g including batteries

Measuring Ranges and Accuracy

Measuring Function	Range	Resolution	Accuracy
AC Current	40mA	0.01mA	±1.0%rdg±8dgt
	400mA	0.1mA
	4A	0.001A
	40A	0.01A
	300A	0.1A	±1.0%rdg±1%FS
AC Voltage	500V	0.1V	±1.0%rdg±8dgt

Accuracy for Harmonics Current and Voltage

Fundamental, 3rd, 5th, 7th : 1%rdg±5dgt±AC current and voltage accuracy
11th and 13th Harmonics : 2%rdg±5dgt±AC current and voltage accuracy
(Min. fundamental input current : more than 2% of each current)

Measuring Principle for I0r Leakage Current

It is observed that the load connected to the low voltage side of the transformer generates the harmonics in the current flow in the power line. And it is observed that5th and 7th harmonics current causes the phenomenon of voltage drop at the high voltage side of the transformer.

This voltage drop at high voltage side added the drops of other related power line generates the terminal voltage with harmonics at low voltage side. Thus, 5th and 7th harmonics is generated at the low voltage side by the influence of high voltage side, and it is considered the ratio of 5th and 7th harmonics current is always constant. Consequently, the ratio of 5th and 7th harmonics flowing into earth line is changed proportionally according to the ratio of capacitive component and resistive component in the circuit.

On the other hand, when the long line is used, it is observed that the fundamental current component into earth line is increased proportionally and the ratio of 5th and 7th harmonics is also changed due to the increase of capacitance and inductance of the circuit. By above fact, the calculation factor can be obtained by the measured ratio of 5th and 7th harmonics current and fundamental current component into earth line. Thus,the resistive leakage current I0rcan be obtained by the computation of the culculation factor and compensation factor of the circuit.

And it is reported that the satisfactory test result was observed from our many practical field tests in Japan.

AC clamp leaker

AC clamp leaker(for AC leakage current)

Digital I0r Leakage Current Clamp Tester

AC clamp leaker
(for AC leakage current)