Introduction to the measurement method of high voltage insulation resistance tester

High voltage insulation resistance tester is a commonly used insulation resistance tester product, which is suitable for insulation testing in maintenance, repair and testing machine calibration of various electrical equipment . It has the advantages of stable performance, high reliability and easy maintenance. Today, the editor mainly introduces the measurement method of high voltage insulation resistance tester, hoping to help users better apply the product.

Measurement method of high voltage insulation resistance tester

1) Insert two grounding probes into the ground at a distance of 20m and 40m from the grounding body respectively along the radial direction of the grounding body, with an insertion depth of 400mm.

Ground resistance test uses: a) actual operation b) equivalent principle

2) Place the ground resistance meter flat near the grounding body and connect the wires. The wiring method is as follows:

① Use the shortest dedicated wire to connect the grounding body to the terminal "E1" of the grounding measuring instrument (three-terminal measuring instrument) or to the common terminal after "C2" is short-circuited (four-terminal measuring instrument).

② Use the longest dedicated wire to connect the measuring probe (current probe) 40m away from the grounding body to the connecting button "C1" of the measuring instrument.

③ Use the remaining length of the dedicated wire in the middle to connect the measuring probe (potential probe) ⒛m away from the grounding body to the terminal "P1" of the measuring instrument.

3) After placing the measuring instrument horizontally, check whether the pointer of the galvanometer points to the center line. If not, adjust the "zero adjuster" to make the pointer of the measuring instrument point to the center line.

4) Set the "magnification scale" (or coarse adjustment knob) to the maximum magnification and slowly turn the generator handle (the pointer begins to deviate), while turning the "measurement dial" (or fine adjustment knob) to make the galvanometer pointer point to the center line.

5) When the pointer of the galvanometer is close to balance (the pointer is close to the center line), speed up the shaking handle to make its speed reach above 120r/min, and at the same time adjust the "measuring dial" so that the pointer points to the center line.

6) If the reading of the "measurement scale" is too small (less than 1) and difficult to read accurately, it means that the magnification scale is too large. At this time, the "magnification scale" should be set to a smaller multiple, and the "measurement scale" should be readjusted so that the pointer points to the center line and the accurate reading is read.

7) Calculate the measurement result, that is, R ground = “magnification scale” reading × “measurement scale” reading.