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Nuclear phase meter, also known as nuclear phase meter, directional meter, high-voltage wireless nuclear phase meter, etc., can be applied to the phase verification and phase sequence verification of power lines and substations. It has the functions of nuclear phase, phase sequence measurement and electrical inspection. It has strong anti-interference, meets the requirements of (EMC) standards, and is suitable for various electromagnetic field interference occasions. The high-voltage phase signal to be measured is taken out by the collector and then directly transmitted after processing.
The internal insulation of the transformer of the nuclear phase instrument is under the action of the working voltage for a long time during operation, especially as the voltage level increases, the electric field strength value that the insulation withstands is very high, and partial discharge is easy to occur in weak insulation. The reason is: the electric field is too concentrated at a certain point, or the electric field strength is too large at a certain point, such as bubbles in the solid medium, impurities are not removed; water, gas, and suspended particles in the oil; in different media combinations, at the interface There is severe electric field distortion. The traces of partial discharge often leave only a small spot on the solid insulation, or a dendritic burn. In the oil, some decomposed small bubbles appeared.
Although the partial discharge time of the nuclear phase meter is short, the energy is also very small, but it is very harmful. Its long-term existence will cause great damage to the insulating material. First, the insulating material adjacent to the partial discharge will be subject to discharge particles. The direct bombardment caused damage to the local insulation. The second is the chemical action of the active gas such as heat, ozone, nitrogen oxide, etc. generated by the discharge, which caused the local insulation to be corroded and aged, and the electrical conductivity increased, resulting in thermal breakdown. The aging and destruction of the internal insulation of the transformer in operation mostly starts from partial discharge.
The nuclear phase meter adopts the new power electronic detection technology and wireless output technology. It is safe and reliable in operation and easy to use. It overcomes many shortcomings of the wired nuclear phase device and conforms to the national power safety inspection and inspection of power tools. The nuclear phase meter changed the past contact measurement method, eliminated the danger of contact measurement, and helped to ensure the personal safety of the measurement personnel. The measurement method is simple and the measurement result is reliable.
Before use, the transmitter of the device must be properly connected to the power supply, and the power of the transmitter should be turned on. If the transmitter is installed less than thirty centimeters from the ground, the accepted sensitivity will be affected. . After you turn on the power switch of the receiver, you should also turn on the test button so that the receiver will enter.
The initial waveform should also be displayed after the timing is over. So how do we know that this instrument can be used normally? If there are sound, text, and light displays in the same place, it means that this instrument can be used normally.
If you are using a nuclear phase meter on site, you need to be aware of the work requirements. The generator should also be connected to the insulating rod. At this time, we need to turn on the power switch. You will see the green indicator on the transmitter indicator.
The nuclear phase instrument judges in the nuclear phase:
When the live wire is touched, an audible signal can be heard and the four indicator lights are on. After 5-10 seconds, the LED2-4 will turn off and the sound signal will stop. When the transmitter is used as a voltage measurement, the working time is set to 5-10 seconds. In the phase measurement, only one LED indicator is on at this time. If the acousto-optic signal keeps on after 5-10 seconds, that is, the battery power is low, the battery needs to be replaced. If measuring another phase line, the transmitter needs to be disconnected from the line, wait until LED1 goes out, and then place the transmitter on the line for additional voltage measurement. Ibid. When the nuclear phase meter enters the measurement mode, the transmitter emits radio frequency signals into the air, and at the same time a part of the signal is transmitted along the line as the antenna to the receiver. Once the signal can be recognized, the receiver starts working immediately.