The main component of the metal oxide arrester's nonlinear resistance valve is zinc oxide, which has excellent nonlinear characteristics. Under normal operating voltage, the resistance value is very high, which is actually equivalent to an insulator. Under over-voltage, the resistance of the resistor is very small, and the residual voltage is very low. However, under normal operating voltage, the valve plate will deteriorate due to long-term power frequency voltage, which will cause changes in resistance characteristics and increase the leakage current flowing through the valve plate.
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The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, which can be used as a fixed installation unit or equipped with a special propulsion mechanism to form a handcart unit.Model and meaning This type of product is equipped with a bistable permanent magnet operating mechanism. The mechanism is equipped with a permanent magnet. The permanent magnet provides the holding force to keep the switch in the closed and open state.
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Conductive partThe fixed contact is composed of a copper plate bent into a right angle, and the perforated end of the fixed contact can be connected with the bus through a screw; The other end is short, and it contacts the moving blade (moving contact) when closing.Two copper plates form a contact strip, also known as a moving contact, which can rotate around the shaft for a certain angle. When closing, it holds the static contact. There is a clamping spring between the two copper plates to adjust the contact pressure between the dynamic and static contacts.
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1. Reasonable design, novel structure, reliable technical performance, compact shape, light weight, flexible installation, high tensile strength, collision resistance, and no damage during transportation;2. The advantages of silicon rubber sheathed metal oxide arrester are cited.
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GN38-12KV series indoor disconnectors are designed and manufactured to meet the needs of compact and miniaturized development of fixed high-voltage cabinets and ring network cabinets. It has a three position structure, fully insulated bottom plate, and is equipped with coaxial locking and perfect mechanical interlocking mechanism, which is compact in shape.
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LXQ (LXQ3, LXQ4) type nonlinear resistance harmonic eliminator (harmonic eliminator for short) for neutral point of voltage transformer is installed in primary winding (or secondary winding) Y of 6~35kV voltage transformer (PT for short). A nonlinear resistance harmonic damping device between the neutral point of the junction line and the ground. Compared with the traditional RXQ type harmonic eliminator, the LXQ type harmonic eliminator has been greatly improved in design to improve the thermal capacity of the harmonic eliminator. The harmonic eliminator has superior electrical performance.
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The discharge counter for lightning arrester is a high-voltage electrical apparatus used to monitor the discharge action of lightning arrester. Its structure consists of nonlinear resistance, electromagnetic counter and some electronic components. Under normal operating voltage, the leakage current flowing through the counter is very small, and the counter does not act.
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HJDW6 outdoor low-voltage knife switch is a single-phase AC 50HZ low-voltage switchgear, which is used in the power system with rated voltage of 0.5KV to connect or isolate the power supply when there is voltage and no load. The knife switch is operated with insulated hook bar The knife switch is a single-phase structure, and each phase is composed of a word mounting plate, a pillar insulator, a knife switch, a contact, etc. The upper end of the knife switch is provided with a fixed pull ring for opening and closing the insulating hook bar□ Operating environmenta.
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Capacitive HY5WR surge arrester is used in 6KV lines to prevent overvoltage generated by vacuum switch and oil-less switch operation capacitor bank, protect capacitor bank from overvoltage damage and absorb overvoltage energy.Advantages of H05WR-10/27 capacitive mine injectorHY5WR-10/27 Capacitor Harm Avoidance Device has good volt-ampere characteristics, excellent protection performance and impact response characteristics, high tolerance to multiple lightning and overvoltage performance, good pollution resistance and other advantages, and the structure Simple, HY5WR-10/27 capacitive arrester
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This unit has been specifically designed to meet the needs of contractors where the necessiiy or the ability to have a Cable Drum Trailer is simply not practical.Available with either a fixed spindle (shown), i.e. drum loaded by external means, or supplied self sufficient in lifting and lowering as used on standard Cable Drum Trailers in our range.The unit comes with a range of options to suit most applications for both the Utility and Rail industries.Diesel, Petrol, Electric or PTO Drum Drive system for ease of cable payout, unit can be pendant controlled.
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Most advanced stirling cooler in the world. Very powerful cooling ability.
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Most advanced stirling cooler in the world. Very powerful cooling ability.
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Due to electromagnetic induction, the metal shielding layer (or metal sheath) of long line high-voltage single core power cables generates induced voltage, which leads to aging of insulation and reduction of insulation grade, resulting in reduced cable life. Once the induced voltage exceeds the sheath breakdown voltage, the outer sheath is broken down, forming a multi-point grounding fault of single core cables.
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A range of Trailer mounted Cable Pulling Winches required for the installation of Power Cables where high
pulling tensions are required.
All of the units are designed with the operator in mind. Simple in operation and robustly engineered, these units
are fitted with heavy duty diesel engines powering hydraulic transmission for smooth controlled pulling, and are
fitted with a console mounted line tension indicator so that at all times the operator has a visual display of the
pulling force applied.
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purposeHigh voltage disconnector is a kind of high-voltage equipment used to connect or isolate power supply under the condition of voltage and no load.□ Service conditions1. Altitude not exceeding 1000m2. Ambient air temperature: upper limit+40 ° C in general area, lower limit 30 ° C in general area3. The wind pressure shall not exceed 700Pa. (equivalent to wind 34m/s)4. The seismic intensity shall not exceed 8 degrees;5. No place with frequent violent movements;6.
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1) It is used to protect electrical equipment from high transient over-voltage and limit the freewheeling time and the freewheeling amplitude.
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FN12-12 and FN12-12R combined apparatus are three-phase high-voltage switchgear with a rated voltage of 12KV and a rated frequency of 50Hz. They are used for breaking and closing load current, closed-loop current, no-load transformer and cable charging current, closing short circuit current, and load switches equipped with grounding switches.
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normal use conditionsAmbient air temperature: upper limit +40°C lower limit -25°CAltitude below 2000mRelative humidity: the daily average value is not greater than 95%, the monthly average value is not greater than 90%The surrounding air should be free from obvious pollution such as corrosive or flammable gas, water vapor, etc. No frequent violent vibration
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The main function Vacuum arc extinguishing is adopted, with strong breaking capacity, long electrical life and mechanical life of 10,000 times; Simple structure, maintenance-free, no long maintenance period; Good insulation performance, strong anti-pollution ability; Equipped with spring or electromagnetic operating mechanism, the mechanical performance is reliable and can be operated frequently; No fire and explosion hazards; built-in current transformer, the accuracy reaches 0.2 level, and can real
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Fuse selection The selection of the fuse should ensure that the distribution transformer internal or the high and low voltage outlet pipe can be quickly fused when there is a short circuit. In practice, the following principles are often used for selection; if the capacity of the distribution transformer is below 160KV, the fuse should be 2-2% of the rated current of the transformer.
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Electrified railway is a railway with electric locomotive as the basic traction force. It is composed of electric locomotive and electric power supply system.The power supply of the electrified railway is from the national grid. The high-voltage alternating current from the State Grid is sent to the railway traction substation for the first time of voltage reduction, and then sent to the overhead contact system.
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X4 UAV miniaturized thermal imager is a small thermal imager specially designed for UAV. It has the characteristics of light weight, small volume, low power consumption, strong environmental adaptability and simple operation. The lens of the product is designed by optical passive heat difference elimination technology. It works in an ultra wide temperature range of - 40 ℃ ~ 55 ℃ without focusing, and can adapt to different areas and indoor and outdoor environments.
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