Grounding shaker selection principle (1) Selection of rated voltage level. Under normal circumstances, equipment with rated voltage below 500v should use 500v or 1000v shaker; for equipment with rated voltage above 500v, use 1000v~2500v shaker. (2) Selection of the resistance range. There are two small black dots on the dial scale of the shake table, and the area between the small black dots is the accurate measurement area. Therefore, when selecting the meter, the insulation resistance value of the device under test should be within the accurate measurement area. How to use the grounding shaker (1) School table. Before the measurement, the shaker should be tested for open circuit and short circuit to check whether the shaker is good. Open the two connecting lines, shake the handle, the pointer should be at the “∞â€, then short the two connecting lines, the pointer should be at “0â€, it is good if the above conditions are met, otherwise it can not be used. (2) The device under test is disconnected from the line, and the large capacitance device is also discharged. (3) Select the shake table that meets the voltage level. (4) When measuring the insulation resistance, generally only use the "l" and "e" terminals, but when measuring the insulation resistance of the cable to the ground or the leakage current of the device under test is serious, the "g" terminal should be used, and The "g" terminates the shield or casing. After the line is connected, turn the handle clockwise. The speed of the shaking should be slow and fast. When the speed reaches 120 rpm (zc-25 type), keep rotating at a constant speed, read after 1 minute, and While reading while shaking, you cannot stop reading. (5) Disassembly and discharge. After the reading is completed, while slowly shaking, disconnect the line and then discharge the device under test. The discharge method is to take the ground wire used for the measurement from the shake table and short-circuit it with the device under test (not the shake table discharge). The test method of the ZZC29B-2 type shake table is as follows: (1) When measuring the grounding resistance of the two terminals of E-E, short-circuit with chrome-plated copper plate and connect it to the 5m long pure copper wire with the instrument. The other end of the wire is connected to the grounding body test point to be tested. on. When measuring the resistance of the shield, the chrome-plated copper plate should be loosened, one E terminal should be connected to the grounding body, and the other E terminal should be shielded. (2) The P-pillar is connected to the 20m pure copper wire of the instrument, and the other end of the wire is connected to the pin. (3) The C-pillar is connected to the 40m pure copper wire of the instrument, and the other end of the wire is connected to the pin 2. 1. Technical requirements for grounding resistance tester setting (1) The grounding resistance tester should be placed 1 to 3 m away from the test point, and the placement should be stable and easy to operate. (2) The terminals of each terminal must be in good contact and firmly connected. (3) The two grounding pins should be placed at a position of 20m and 40m from the left and right sides of the grounding body to be tested. If the two pins are connected by a straight line, the grounding body to be tested should be basically on this line. (4) Do not replace other pure copper wires of 5m, 20m, 40m length with the instrument. (5) If the grounding resistance tester is centered, the angle between the two pins and the tester should be at least 120°, and it should not be set in the same direction. (8) The grounding body to be tested should be treated with rust removal to ensure reliable electrical connection. 2. Operating principle of grounding resistance tester (1) The measurement of the grounding resistance value is started only after the tester is set to meet the specifications. (2) Before the measurement, the grounding resistance gear knob should be rotated in the maximum gear position, ie x10 gear position. The adjustment grounding resistance value knob should be placed in the 6~7Ω position. (3) Rotate the handle slowly. If the pointer of the galvanometer is quickly deflected to the right from the 0 balance point in the middle, the original range selection is too large, and the gear can be selected to the x1 position. If the deflection direction is as before, the The gear selection is transferred to the x0 1 gear. (4) After selecting by step (3), slowly rotate the handle, and the pointer of the galvanometer is offset from the 0 balance point to the right. The grounding resistance value is still too large. When the handle is slowly rotated, the grounding resistance knob should be slowly clockwise. Rotate, when the oximeter pointer returns to 0, gradually increase the handle rotation speed, so that the handle rotation speed reaches 120 rev / min. At this time, the resistance value indicated by the ground resistance multiplied by the multiple of the gear position is to measure the grounding resistance value of the grounding body. If the pointer of the galvanometer is slowly deflected to the left, the resistance of the grounding resistance knob is less than the actual grounding resistance, and it can be rotated counterclockwise slowly to increase the indication value of the meter resistance. (5) If the handle of the galvanometer is beep when the handle is rotated slowly, it means that the ground soil of the two ground pins is not dense or there is a bad contact of a joint. In this case, check the ground of the two pins or Each joint. (6) When the grounding resistance of the static pressure pile is measured by the grounding resistance measuring instrument, it is normal that the pointer of the galvanometer has a slight left and right swing at 0 o'clock. (7) When the pointer of the galvanometer moves slowly to the 0 balance point, the handle of the instrument generator can be accelerated, and the rated speed of the handle is 120 rpm. It is strictly forbidden to speed up the rotation of the handle when the pointer of the galvanometer still has a large deflection. (8) After the measuring instrument is used, the resistance position should be placed at the maximum position, that is, the x10 position. Finish the three test leads that are configured with the meter, clean the dirt on the two pins, and pack the bags. Ac Gear Motor,Ac Geared Motor,Asynchronous Ac Motor,Asynchronous Ac Gear Motor NingBo BeiLun HengFeng Electromotor Manufacture Co.,Ltd. , https://www.hengfengmotor.com
(6) The soil set by the two pins must be solid and cannot be placed in the mud, backfill, tree roots, grass and other places.
(7) The grounding resistance test can only be carried out after 7 sunny days after the rain.
How to use the grounding shaker
The grounding shaker, also known as the megohmmeter, is a meter used to measure the insulation resistance and high value resistance of the device under test. It consists of a hand-cranked generator, a meter head and three terminals (ie l: line end, e: Ground terminal, g: shield end).