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SOLAR INSULATION RESISTANCE TESTER

THEORY of Indication for insulation failure point

As shown on the drawing 2, considering that an insulation failure (Rx) happens between solar panel modules and provided that the generated voltage of PV system is Vo and the voltage from insulation failure point to P phase terminal is Vx. Also, provided that applied voltage is V1 and current is I1.

When measuring the insulation resistance two times by changing voltage, provided that the fist applied voltage is V1, current I1 and the second applied voltage is V2, current I2, the drawing 3 is showing the relation between these applied voltages and currents.
The intersection point Vx with horizontal axis (current I=0) on the drawing 3 is showing the generated voltage of solar panel from P phase to the insulation failure point. The insulation failure point can be specified by the ratio of the generated voltage of solar panel Vo to the generated voltage to failure point Vx

MIS-PV1

PV OK, 2RANGE

FEATURES

  • Can measure accurately during PV generating
  • Safety – no need to short-circuit P & N phase
  • Measurable from AC circuit to PV panels
  • Switchover 2 ranges – 500/1000V

MIS-PV2

PV OK, 4 RANGE, AC VOLT

FEATURES

  • Can measure accurately during PV generating
  • Safety – no need to short-circuit P & N phase
  • Measurable from low voltage circuit to PV panels
  • Can be used in ordinary electric circuit
  • Switchover 4 ranges – 125/250/500/1000V

MIS-PVS

PV OK, 2 RANGE, DC VOLT, DETERIO RATION

FEATURES

  • With function to judge deterioration point (only for solar panel measurement)
  • Can measure accurately during PV generation
  • Safety – no need to short-circuit P & N phase
  • Measurable from AC circuit to PV panels
  • Measurable generated voltage (DC0〜999V)
  • Switchover 2 ranges – 500/1000V

GENERAL

We developed the insulation resistance tester which can measure insulation resistance at solar panels easily under generating condition. (Patent Pending).
The ordinary insulation resistance testers cannot measure resistance correctly during generation but model MIS-PVS can make measurement easily regardless of generating or no power and also can display the insulation failure point. (at P phase side, N phase side or between modules).

(1) Indicate the insulation failure point of PV systems
(2) Can measure the insulation resistance at solar panel side under generating conditions by one operation.
(3) Can measure the insulation resistance of ordinary electrical equipment.

MEASUREMENT

  1. Make the disconnector off.
  2. Apply N clip of the tester to N phase side.
  3. Connect E clip to grounding earth side.
  4. Apply the probe to P phase side of solar panel.
  5. Set the measuring switch of MIS-PVS on.
  6. The insulation resistance value is displayed on LCD.
  7. In case of the measured value less than 1MΩ, P1~P12 on LCD display will be lightening. When P3 is lightening, there is an insulation failure at the place between 3/10 and 4/10 of whole modules. P1 will be lightening in case of the insulation failure at P phase side and P11 will be lightening in case of failure at N phase side.

SPECIFICATIONS

RATED VOLTAGE EFFECTIVE MIS-PV1/MIS-PVS(500/1000V) MIS-PV2(125/250/500/1000v)
125V 250V 500V 1000V
MAX. DISPLAY 20MΩ 50MΩ 100MΩ 200MΩ
CENTER 0.5MΩ 1MΩ 2MΩ 50MΩ
FIRST EFFECTIV 0.02MΩ〜10MΩ 0.05MΩ〜20MΩ 0.1MΩ〜50MΩ 2MΩ〜1000MΩ
TOLERANCE Less than ±5%
SECOND EFFECT. 0.01MΩ〜less 0.02MΩ
Over 10MΩ〜20MΩ
0.02MΩ〜less 0.05MΩ
Over 20MΩ〜50MΩ
0.05MΩ〜less 0.1MΩ
Over 50MΩ〜100MΩ
1MΩ〜less 2MΩ
Over 1000MΩ〜2000MΩ
TOLERANCE Less than ±10%
DETERIORATION
(ONLY MIS-PVS)
Deterioration point will be displayed on LCD in case of insulation resistance less than 1MΩ.
※Only during measurement of PV panels, indicate P or N phase and or between modules.

AC VOLTAGE(ONLY MIS-PV2)

RANGE AC0〜599V (Min. Resolution 0.1V)
TOLERANCE ±1.5%rdg±10dgt

DC VOLTAGE(ONLY MIS-PVS)

RANGE DC0〜999V (Min. Resolution 0.1V)
TOLERANCE ±1.5%rdg±10dgt

GENERAL

 

DISPLAY RANGE 3.200MΩ/32.00MΩ/320.0MΩ/3200MΩ (4 Range Auto)
OTHER FUNCTIONS OVER RANGE DISPLAY, DATA HOLD, AUTO POWER OFF, BACKLIGHT,
LOW BATTERY DISPLAY, AUTO DISCHARGE
STANDARD JIS C 1302 Equivalent
OPERATING TEMP. 0〜40℃, less than 80%RH (without condensing)
POWER SUPPLY 1.5V (AA size, LR6) alkali battery×6 pcs.
DIMENSION/WEIGHT 170(W)×105(D)×52(H)㎜, approx. 350g (without batteries)
ACCESSORIES MIS-PV1 : Line Cord×1, Earth Cord×1, Case for Cords
MIS-PV2 : Line Cord×1, Earth Cord×1, Hard Case for Instrument×1
MIS-PVS : Line Cord×2, Earth Cord×1, Hard Case for Instrument×1
Common : Insulation Cap×1, Belt×1, LR6 battery×6, Instruction Manual×1