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RESISTIVE CURRENT LEAKAGE CLAMP TESTER

Ior (RESISTIVE) LEKAGE CURRENT MEASUREMENT

BACKGROUND

Nowadays, many harmonics and high-frequency current are contained to leakage current of grounding line and or other circuits due to spread of high-frequency electric apparatus with inverter, converter, etc. and the measured values by different instruments are not same even at the same measuring point.
Generally, leakage current contains the resistive component (Ior) which flows to the ground by insulation deterioration and also, the capacitive component (Ioc) which flows by electrostatic capacity caused from above high-frequency and harmonics.
The actual insulation deterioration should be related with only Ior but ordinary leakage clamp testers can measure only Io (vector between Ior & Ioc as under drawings) and cannot judge what kind of leakage current is flowing.

MEASURING METHODS FOR RESISTIVE LEKAGE CURRENT

There are mainly two methods for measuring resistive component of leakage current as followings:
1. Igr Method – Inputting a certain fixed low range frequency to the circuit by injection CT.
2. Ior Method – Measuring synchronous current based on the circuit voltage inputted to clamp tester.

We are adopting Ior method to all our Io/Ior Digital Clamp Testers (except for model MCL-400IR), as Igr method is very difficult to have injection CT in the actual measuring fields.
Our new models MCL-500IRV, 340IRV & MCL-800IRV have non-contact voltage sensors which enable more safely measurement without touching voltage terminals.
Also, model MCL-400IR has very unique method, detecting harmonics (5th & 7th) and measuring resistive component by calculations without voltage input.

M-340IRV

Mini Type, easy to hand carry

FEATURES

Integrated Non-contact Voltage Input Type Clamp Leaker.
*Safety: Available voltage input from the coated conductors (not touching voltage terminal)
*Convenience: Built-in LCD display combined with clamp CT.
It is getting more & more difficult to check the insulation conditions by ordinary Io leakage current due to spread of inverter appliances, etc.
By detecting resistive leakage current (Ior), management of insulation conditions can be made more accurately on the live lines

MCL-500IRV

Wide Range, measurable from mA to Line Current up to 500A

FEATURES

Integrated Non-contact Voltage Input Type Clamp Leaker.
*Safety: Available voltage input from the coated conductors (not touching voltage terminal)
*Convenience: Built-in LCD display combined with clamp CT.
It is getting more & more difficult to check the insulation conditions by ordinary Io leakage current due to spread of inverter appliances, etc.
By detecting resistive leakage current (Ior), management of insulation conditions can be made more accurately on the live lines

MCL-800IRV

Big Window CT, High Precision

FEATURES

Integrated Non-contact Voltage Input Type Clamp Leaker.
*Safety: Available voltage input from the coated conductors (not touching voltage terminal)
*Convenience: Built-in LCD display combined with clamp CT.
It is getting more & more difficult to check the insulation conditions by ordinary Io leakage current due to spread of inverter appliances, etc.
By detecting resistive leakage current (Ior), management of insulation conditions can be made more accurately on the live lines

MCL-400IR

FEATURES

  • Can measure the resistive leakage current (Ior) of the grounding lines and other electric circuit without voltage input.

Specifications

Parameters M-340IRV MCL-500IRV MCL-800IRV MCL-400IRV
Measuring Function Line Current
Leakage Current
Resistive Leakage Current
Line Current
Leakage Current
Resistive Leakage Current
Line Current
Leakage Current
Resistive Leakage Current
Line Current
Leakage Current
Resistive Leakage Current
Harmonics current and voltage
(Fundamental, 3rd, 5th,7th, 11th and 13th)
AC Voltage
Available Circuits for Ior Measurement 1P/2W, 1P/3W, 3P/3W 1P/2W, 1P/3W, 3P/3W, 3P/4W star connection 1P/2W, 1P/3W, 3P/3W, 3P/4W star connection
CT Inside Diameter φ40mm φ40mm φ80mm φ40mm
AC Current Range 10mA/100mA/60A 40mA/400mA/4A/40A/500A 10mA/100mA/1000mA/10A AC 0-40mA, 400mA, 4A, 40A, 300A,
AC 0~500V
Minimum Resolution 0.001mA 0.01mA 0.001mA 0.01mA
Accuracy Range/ Resolution/ Accuracy
I
60A/ 0.01A/
0 ~ 49.99A ±1.0%rdg±10dgt
50A ~ 59.99A ±3.0%rdg±10dgt
Io
10mA/ 0.001mA/ ±1.0%rdg±10dgt
100mA/ 0.01mA/ ±1.0%rdg±10dgt
Ior
10mA/ 0.001mA/ ±3.0%rdg±20dgt
100mA/ 0.01mA/ ±2.5%rdg±20dgt
Range/ Resolution/ Accuracy
I, Io
40mA/ 0.01mA/ ±1.0%rdg±10dgt
400mA/ 0.1mA/ ±1.0%rdg±10dgt
4A/ 0.001A/ ±1.0%rdg±10dgt
40A/ 0.01A/ ±1.0%rdg±10dgt
500A/ 0.1A/ ±1.0%rdg±3.0%FS
Ior(direct)
40mA/ 0.01mA/ ±1.5%rdg±15dgt
400mA/ 0.1mA/ ±1.2%rdg±15dgt
4A/ 0.001A/ ±1.2%rdg±15dgt
Ior (non- contact)
40mA/ 0.01mA/ 0.40mA~3.99mA/ ±3.0%rdg±20dgt
4.00mA~39.99mA/ ±1.5%rdg±15dgt
400mA/ 0.1mA/ 4.0mA~39.9mA/ ±3.0%rdg±20dgt
40.0mA~399.9mA/ ±1.5%rdg±15dgt
4A/ 0.001A/ 0.040A~0.399A/ ±3.0%rdg±20dgt
0.400A~3.999A/ ±1.5%rdg±15dgt
Voltage
500V/ 0.1V/ ±1.0%rdg±8dgt
Range Resolution Display Accuracy
I, Io
10mA/ 0.001mA/ ±1.0%rdg±10dgt
100mA/ 0.01mA/ 1±1.0%rdg±10dgt
1000mA/ 0.1mA/ ±1.0%rdg±10dgt
10A/ 0.001A/ ±1.0%rdg±10dgt

Ior
(direct) 10mA/ 0.001mA/ ±1.5%rdg±20dgt
100mA/ 0.01mA/ ±1.5%rdg±15dgt
1000mA/ 0.1mA/ ±1.5%rdg±15dgt
10A/ 0.001A/ ±1.5%rdg±15dgt
Ior (non contact) Single Phase
10mA/ 0.001mA/ ±2.0%rdg±20dgt
100mA/ 0.01mA/ ±2.0%rdg±15dgt
1000mA/ 0.1mA/ ±2.0%rdg±15dgt
10A/ 0.001A/ ±2.0%rdg±15dgt
Ior (non contact) Three Phase
10mA/ 0.001mA/ 0.500mA~4.999mA ±3.0%rdg±40dgt
5.000mA~9.999mA ±2.0%rdg±15dgt
100mA/ 0.01mA/ ±2.0%rdg±15dgt
1000mA/ 0.1mA/ ±2.0%rdg±15dgt
10A/ 0.001A/ ±2.0%rdg±15dgt
Voltage
500V/ 0.1V/ ±1.0%rdg±8dgt
Measuring Function/Range/Resolution/Accuracy
AC Current/40mA/0.01mA/±1.0%rdg±8dgt
AC Current/400mA/0.1mA/±1.0%rdg±8dgt
AC Current/4A/0.001A/±1.0%rdg±8dgt
AC Current/40A/0.01A/±1.0%rdg±8dgt
AC Current/300A/0.1A/±1.0%rdg±1%FS
AC Voltage/500V/0.1V/±1.0%rdg±8dgt
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)
Display LCD, max.9999 reading with annunciator LCD, max.9999 reading with annunciator LCD, max.9999 reading with annunciator 3.5 digit LCD, max. reading of 4000
AC Conversion Successive approximation method Successive approximation method Successive approximation method Average sensing rms reading
Input Frequency 45~65Hz (by switch for 50/60Hz) 50/60Hz ( Auto) 50/60Hz (manual change) 45-65Hz
Measuring method Clamp CT (in case of Ior, based on voltage standard) Clamp CT (in case of Ior, based on voltage standard to be inputted directly or by non-contact voltage sensor Clamp CT (in case of Ior, based on voltage standard to be inputted directly or by non-contact voltage sensor Dual slope integration mode
Over range indication "OL" mark on LCD "OL" mark on LCD "OL" mark on LCD "OL" mark on LCD
Low battery indication "Battery mark" on LCD "Battery mark" on LCD "Battery mark" on LCD "Battery mark" on LCD
Auto power off function Approx. 10 minutes later after final key operation Approx. 10 minutes later after final key operation Approx. 10 minutes later after final key operation Approx. 10 minutes later after final key operation
Data hold indication "DH" mark on LCD "DH" mark on LCD "DH" mark on LCD "DH" mark on LCD
Sampling Rate Two Times/Second Two Times/Second Two Times/Second Two Times/Second
Operating Circuit Voltage Less than AC500V (Isolated Electric Wire) Less than AC500V (Isolated Electric Wire) Less than AC500V (Isolated Electric Wire) Less than AC 500V
Withstanding Voltage AC 2200V/1 minute between CT core and grip AC 2200V/1 minute between CT core and grip AC 2200V/1 minute between CT core and grip AC 2200V, 1minute
Influence of external magnetic field Less than 5mA (nearby 100A conductor)
Operating Temp. & Humidity Range 0~50℃ Less than 85%RH (w/o condensation) 0~50℃ Less than 85%RH (w/o condensation) 0~50℃ Less than 85%RH (w/o condensation) 0℃~40℃, < 80%RH ( Without condensation )
Storage Temperature -10~60℃, < 80%RH (without condensation) -10~60℃, < 80%RH (without condensation) -10~60℃, < 80%RH (without condensation) -10~60℃, < 70%RH (without condensation)
Power Supply AAA Size Alkaline Battery x 3 AAA Size Alkaline Battery x 3 AAA Size Alkaline Battery x 3 1.5V ("AAA" sixe, um-4)x3 or AC adaptor (Option)
Power consumption 10mA (approx. 80h for continuous use) 13mA (approx. 48h for continuous use) 14mA (approx. 48h for continuous use) Approx. 8mA (Approx. 60 hours continuous)
Dimension/Weight W44×H197×D24mm Approx.210g W70×H223×D34mm Approx.440g W71×H315×D37mm Approx.750g 70(W)x223(H)x34(D)mm Approx. 440g including batteries
Accessories Carrying Case, Non-contact Voltage Sensor, Instruction Manual Carrying Case, Non-contact Voltage Sensor, Direct Voltage Input Sensor, Instruction Manual Carrying Case, Non-contact Voltage Sensor, Direct Voltage Input Sensor, Instruction Manual Carrying Case…..1, Instruction Manual…..1
Batteries…..3 (installed into the instrument)
Dimension/Weight W44×H197×D24mm Approx.210g W70×H223×D34mm Approx.440g W71×H315×D37mm Approx.750g 70(W)x223(H)x34(D)mm Approx. 440g including batteries