Introduction and Safety Use Specification of High and Low Voltage Clamp Ampere Meters
The high and low voltage clamp ammeter breaks through the traditional structure and is specifically designed for online measurement of the leakage situation of high-voltage lines and judgment of the operation of zinc oxide lightning arresters. Using CT and shielding technology, it is composed of a dedicated high-voltage detector and a high-voltage insulation rod. It wirelessly transmits test data and is equipped with a wireless receiver, which can receive the measured data within 30 meters in a straight line. If an insulated rod is not used, it can also be used as a high-precision low-voltage clamp leakage current meter or ammeter, which can accurately measure a leakage current or current of 0.01mA.
The high and low voltage clamp ammeter can be used as a ratio tester for high and low voltage current transformers and a zinc oxide lightning arrester tester. Measure the current of the primary and secondary circuits of the current transformer separately, and then calculate the transformation ratio or converted transformation ratio of the current transformer. Attention: Since the leakage current of the lightning arrester after operation should be less than 500uA, the operation of the lightning arrester can be judged based on the leakage situation of the tested lightning arrester. If the measured leakage current of the lightning arrester is too large, exceeding 500uA, and if the system voltage is ruled out to be too high, the lightning arrester may have stains, dampness, or aging. The larger the leakage current, the more severe the stains, dampness, or aging will be.
The integrated design of the clamp head and guide area of the high and low voltage clamp ammeter ensures high precision, high reliability, and high stability for year-round uninterrupted testing. The insulating rod is lightweight and has the characteristics of moisture resistance, high temperature resistance, impact resistance, bending resistance, high insulation, and stretchability.
This instrument is connected to an insulation rod and can be used for measuring leakage current in high-voltage lines below 60kV. It can be used for online current measurement to determine whether zinc oxide lightning arresters are damp or poorly operated. The instrument also has functions such as peak holding, data holding, data storage, wireless transmission, etc. Its dedicated high-voltage pliers can easily clamp or withdraw the tested wires by pressing or pulling the insulation rod, saving time and speed. It is widely used in substations, power plants, industrial and mining enterprises, as well as testing stations, electrical maintenance departments for leakage detection and field electrical operations.
The high and low voltage clamp type ammeter is connected to an insulation rod and can be used for measuring the current of high-voltage lines below 23KV. It is also used for online current measurement and has functions such as peak holding, data holding, data storage, and wireless transmission. Its dedicated clamp type ammeter can easily clamp or withdraw the tested wire by pressing or pulling the insulation rod, saving time and speed. It is widely used in substations, power plants, industrial and mining enterprises, as well as testing stations, electrical maintenance departments for current detection and field electrical operations. It can also replace the high and low voltage ratio tester, which measures the high and low voltage currents of the primary and secondary circuits separately, and then calculates the high and low voltage ratio. The insulating rod is lightweight and has the characteristics of moisture resistance, high temperature resistance, impact resistance, bending resistance, high insulation, and stretchability.
4. Fiber loss factor (α): To reflect the characteristics of fiber attenuation, we introduce the concept of fiber loss factor.
5. Measurement of attenuation: Because connecting the fiber optic to the light source and measuring the optical power inevitably introduces additional losses. Therefore, during on-site testing, it is necessary to first set the testing reference point of the tester (i.e. reset to zero). There are several methods for testing reference points, mainly selected based on the tested link object. In fiber optic cabling systems, due to the short length of the fiber itself, more emphasis is placed on connectors and test jumpers in the testing method, making the method more important.
Return loss: Reflection loss, also known as return loss, refers to the decibel ratio of backward reflected light to input light at the fiber optic connection. The greater the return loss, the better, in order to reduce the impact of reflected light on the light source and system. The method to improve return loss is to choose to process the fiber end face into a spherical or oblique spherical surface as much as possible, which is an effective method to improve return loss.
