Shanghai Metrology Institute's high-voltage and high-current measurement team serves university research results

[ China Instrument Network Instrument Development ] Recently, the Shanghai Metrology and Testing Technology Research Institute's high-voltage and high-current measurement innovation team was commissioned by Shanghai Jiaotong University to provide performance testing services for its space charge measurement devices.

The space charge measuring device is the scientific research achievement of the National Natural Science Foundation of China, "Numerical Simulation and Application Research of Space Charge Transport in Polymer Nanocomposite Media" undertaken by Shanghai Jiaotong University, for evaluating 500kV grade power cable insulation and other coaxial insulation. The space charge distribution inside the structural power equipment can provide technical support for the ultra-high voltage transmission in the construction of smart grid.
As the device is the innovative result of the project, the high-voltage and high-current measurement innovation team of Shanghai Metrology and Testing Technology Research Institute has communicated with the R&D personnel of the Jiaotong University project team after receiving the commissioned task. Starting from the measurement principle of the device, we will deeply understand the working characteristics based on the electroacoustic pulse method; refer to the relevant IEC standards and domestic standards, determine the parameters and corresponding methods for the required measurement; formulate a unique test plan and successfully complete it on site. The inspection work was well received by the Jiaotong project team.
As a bureau's technology innovation team, the high-voltage and high-current measurement innovation team has always focused on the new demand for high-voltage and high-current measurement in the national smart grid, power transmission, high-speed rail and new energy industries, breaking through the key measurement and testing technologies in the high-voltage field and building digital New metering standard device. The performance testing service provided for the scientific research results of the Jiaotong University project has deepened the mutual understanding between the Shanghai Metrology and Testing Technology Research Institute and the universities, and promoted the multi-faceted technical exchanges between the two universities, and further improved the high-voltage equipment in our hospital. Industry recognition in the field of testing.
(Original title: Our high-voltage and high-current measurement innovation team serves the scientific research achievements of universities)

A Solenoid Valve is an electromechanically operated valve. The valve is controlled by an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.

Solenoid valves are the most frequently used control elements in fluidics. Their tasks are to shut off, release, dose, distribute or mix fluids. They are found in many application areas. Solenoids offer fast and safe switching, high reliability, long service life, good medium compatibility of the materials used, low control power and compact design.

Besides the plunger-type actuator which is used most frequently, pivoted-armature actuators and rocker actuators are also used.


Solenoid valve designs have many variations and challenges.

Common components of a solenoid valve:

  • Solenoid subassembly
    • Retaining clip (a.k.a. coil clip)
    • Solenoid Valve Timer
    • Solenoid Coil (with magnetic return path)
    • Core tube (a.k.a. armature tube, plunger tube, solenoid valve tube, sleeve, guide assembly)
    • Plugnut (a.k.a. fixed core)
    • Shading coil (a.k.a. shading ring)
    • Core spring (a.k.a. counter spring)
    • Core (a.k.a. plunger, armature)
  • Core tube–bonnet seal
  • Bonnet (a.k.a. cover)
  • Bonnet–diaphram–body seal
  • Hanger spring
  • Backup washer
  • Diaphram
    • Bleed hole
  • Disk
  • Valve body
    • Seat
    • air valve
    • water inlet valve
    • control valve

The core or plunger is the magnetic component that moves when the solenoid is energized. The core is coaxial with the solenoid. The core's movement will make or break the seals that control the movement of the fluid. When the coil is not energized, springs will hold the core in its normal position.

The plugnut is also coaxial.

The core tube contains and guides the core. It also retains the plugnut and may seal the fluid. To optimize the movement of the core, the core tube needs to be nonmagnetic. If the core tube were magnetic, then it would offer a shunt path for the field lines. In some designs, the core tube is an enclosed metal shell produced by deep drawing. Such a design simplifies the sealing problems because the fluid cannot escape from the enclosure, but the design also increases the magnetic path resistance because the magnetic path must traverse the thickness of the core tube twice: once near the plugnut and once near the core. In some other designs, the core tube is not closed but rather an open tube that slips over one end of the plugnut. To retain the plugnut, the tube might be crimped to the plugnut. An O-ring seal between the tube and the plugnut will prevent the fluid from escaping.

The solenoid coil consists of many turns of copper wire that surround the core tube and induce the movement of the core. The coil is often encapsulated in epoxy. The coil also has an iron frame that provides a low magnetic path resistance.


Solenoid Valve

Electromagnetic Valve, Pneumatic Component, Pneumatic Solenoid Valve, Air Compressor Valve,Solenoid Valve Timer

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