High-voltage electroscopes are mainly used to test high-voltage electrical equipment whose ground voltage is above 250V. At present, three types are widely used: luminous type, sound and light type, and windmill type. High-voltage electroscopes generally consist of three parts: the detection part (indicator part or windmill), the insulation part, and the handshake part. The insulating part refers to the part from the metal connecting screw at the bottom of the indicator to the cover guard ring, and the handshake part refers to the part below the cover guard ring. The insulation part and handshake part have different lengths according to different voltage levels. When using a high-voltage electroscope for electrical testing, you must first carefully implement the operation supervision system, with one person operating and one person monitoring. The operator is in front and the guardian is in the back. When using an electroscope, it must be noted that its rated voltage must be consistent with the voltage level of the electrical equipment under test, otherwise it may endanger the operator's personal safety or cause misjudgment. During electrical testing, operators must wear insulating gloves and insulating boots to prevent harm to the human body from step voltage or contact voltage. The operator should hold the handshake part below the cover guard ring and check on the electrical equipment first. During inspection, the live equipment should be slowly moved closer until it emits light or sounds to verify the integrity of the electroscope. Then test it on the equipment that needs to be tested. When conducting electrical tests on multi-layer lines erected on the same pole, the low voltage should be tested beforehand, and the high voltage should be tested afterward. The lower layer should be tested beforehand, and the upper layer should be tested afterward. It should be noted that before using a high-voltage electric test pen to test electricity, be sure to read the instruction manual carefully and check whether the test is over-periodic and whether the appearance is damaged or broken. For example, when taking the GDY type high-voltage electric wind electroscope out of the bag, you should first observe whether the blade of the electric rotary indicator is detached and whether the alarm sounds. Those who are detached are not allowed to use it. Then, gently hold the electric rotary indicator in your hand. Shake, the blades should swing slightly to prove that it is good, and then check the alarm part to prove that the sound is good. For the GSY series high-voltage sound and light type electroscope, a self-test test should be performed on the indicator before operation. Only then can the indicator be rotated and fixed on the operating rod, and the operating rod be stretched to the specified length. The self-test can only be carried out after another self-test. . Note that high-voltage electroscopes cannot detect DC voltage. During storage and transportation, do not subject it to strong vibration or impact, and do not allow unauthorized adjustment, disassembly, or installation. It must not be used in environments such as rain and snow that affect the insulation performance. Do not expose it to the hot sun in the open air. It should be kept in a dry and ventilated place. Do not wipe or touch it with corrosive chemical solvents and detergents.
Is the high-voltage motor allowed to reverse?
The wind power of the electric fan is determined by the following factors:
1. The speed of the fan body. The higher the speed, the greater the wind power.
2. The sweep area of the electric fan. The larger the sweep area, the stronger the wind force.
3. The wing shape of the electric fan itself. Different wing shapes have different wind forces.
The main reason for this phenomenon is that there is too much dust on the fan blades and protective grille, or they are covered with oil fumes, which causes the electric fan's wind power to become smaller. main reason.
In other cases,There is a problem with the coil inside, causing the electric fan to rotate very slowly. This situation is very rare. The reason for this is usually that the electric fan in your home has been left for too long, and the environment where it is placed is not good, which causes the coil inside Or the magnet inside is rusty, so the magnetic force cannot be achieved, so after the electric fan is powered on, the electric fan rotates very slowly.
Extended information:
Because the driving air below does not require a large flow rate, the noise is very low. Because the driving air drives the surrounding air, the air volume is higher than that of ordinary electric fans. In addition, ordinary fans use blades to cut the air to promote airflow, so it is unpleasant. This fan is a continuous flow of air, so it is more comfortable. Also, this fan is not as top-heavy as ordinary fans, so it is more stable.
When you encounter the problem of the electric fan's wind force becoming smaller, you must observe whether there is too much dust stuck on the fan blades and protective grille of the electric fan. To ensure our own safety, what we need to do is to cut off the power, then find a pen and test the electric fan to ensure that there is no high voltage in the electric fan.
Then there is a round of disassembly and cleaning of the electric fan. Clean it thoroughly. Do not drip water into the circuit. This is very dangerous, and then wait for the fan to dry.
When we plug in the power and turn on the electric fan, we will find that there are no impurities such as dust or spider webs on the fan surface, and the air output effect is much better than usual.
Motors with sliding bearings are generally not allowed to reverse, but they can be reversed for a short time (during test run)! There are many problems caused by reversal, and wind path is one of them, but not all. The bearing bush of the sliding bearing should have an oil wedge, which is a structure that brings lubricating oil into the bearing bush from the inlet of the bearing bush. If it is reversed, the oil wedge will not work properly and it is possible to break the bush (it is estimated that such a large motor should be equipped with a bearing bush temperature At the measuring point, is the temperature usually very high?). So it should still be turned forward. Simply changing the fan blades cannot completely solve the problem. The following options can be considered: 1. Replace the motor; 2. Ask the manufacturer to modify the motor (bearing bushes, blades, etc.); 3. Install the motor to the other side of the fan; 4. Install a 1:1 transmission to change the steering.
As can be seen from the photo, this kind of motor is air-to-air cooling, that is, the motor has an internal air circulation and an external air circulation. The internal air circulation is not connected to the outside. The filter you can see now has an external circulation fan inside, which inhales the air and passes it to the cooling system above the motor.inside the cooler tube, cooling the internal air located outside the cooler tube, so simply changing the external fan will not solve the problem. If you need to temporarily solve the problem of high temperature of the motor, and if the working environment of the motor is not too dirty, you can (note that it is only necessary for emergencies) open several air holes located at the lower part of the motor to allow the internal air to directly exchange with the outside world. This may make the inside of the motor dirty. It can only be used when the environment is relatively clean. The inside of the motor must be cleaned during maintenance!