ZC-11D Megger

ZC-11D Megger Product Description: 1, the choice of the provisions megger megger voltage level should be higher than the measured object insulation voltage levels. So measuring the rated voltage below 500V equipment or wiring insulation resistance, the choice of 500V or 1000V megger; measuring a rated voltage of more than 500V equipment or line insulation resistance should be used in 1000 ~ 2500V megger; measure When the insulator should be used 2500 ~ 5000V megger. Under normal circumstances, measuring ZhaoOuBiao three terminal, marked "ground" (E) and "Line" (L) on the upper end of the two larger terminals respectively, at the bottom of a small terminal labeled "guard ring" (or "shield") (G). (1) line-to-ground insulation resistance will "ground" terminal megger (ie E terminal) grounded correctly (usually connected to a grounding on), the "line" terminal (ie, terminal L ) connected to the circuit under test, as shown in Figure 17a. After connecting, clockwise shake megger, speed gradually accelerated, keeping in about 120 rev / min uniform shaking, when speed and stability, table pointer is also stable, the value indicated by the pointer is the analyte of insulation resistance value. Actual use, E, L two terminals to be any connection that can be connected with E then measured object, L can be connected to the grounding (ie ground), but G terminal must not be connected correctly. (A) measuring circuit insulation resistance (b) measure the motor insulation resistance (c) measuring cable insulation resistance 17 Megohmmeter connection method (2) measure the motor insulation resistance will ZhaoOuBiao E terminal connected to the housing (ie, Ground), L terminal connected to one phase of the motor winding, shown in Figure 17b, the insulation resistance value is a relative measure of the insulation resistance value. (3) measuring cable insulation resistance measurement cable conductive core and cable jacket insulation resistance, the terminal E with the cable connected to the housing, and the line terminal L-pin connector, while the G with the cable terminal shell, core It is connected between the insulating layer, as shown in Fig 17c. 3. Caution (1) prior to use should be open and short tests. So that L, E two terminals in the open state, shaking ZhaoOuBiao pointer should point "∞"; the L and E two terminals shorted, slowly rotate the pointer should point to "0". These two requirements are met, indicating megger is good. (2) Measurement of insulation resistance of electrical equipment, it must first cut off the power, then the device is discharged, in order to ensure the safety and accurate measurement. (3) megger measurement should be in a horizontal position, and firmly hold down ZhaoOuBiao prevent shaking shaking, the shaking speed of 120 rev / min. (4) The lead wire should be multi-strand cord, and have good insulation properties, should not twist two wires together, in order to avoid inaccurate measurement data. (5) shall be measured immediately after the discharge of the measured object, in the shake shake table test was not stopped and not before the discharge can not be a hand to touch the measurement portion analytes or remove the wire, to prevent electric shock. ZC25B / ZC11D / ZC11E Pointer insulation resistance meter (hand type) Model Range Accuracy ZC25B-1 100V / 100MΩ ± 10% ZC25B-2 250V / 250MΩ ± 10% ZC25B-3 500V / 500MΩ ± 10% ZC25B-4 1000V / 1000MΩ ± 10% ZC11D-1 100V / 500MΩ ± 10% ZC11D-2 250V / 1000MΩ ± 10% ZC11D-3 500V / 2000MΩ ± 10% ZC11D-4 1000V / 5000MΩ ± 10% ZC11D-5 2500V / 10000MΩ ± 10% ZC11D-6 100V / 20MΩ ± 10% ZC11D-7 250V / 50MΩ ± 10% ZC11D-8 500V / 100MΩ ± 10% ZC11D-9 50V / 200MΩ ± 10% ZC11D-10 2500V / 2500MΩ ± 10%? ZC11E 250V / 250MΩ ± 10% 500V / 500MΩ ± 10% 1000V / 1000MΩ ± 10%