The Connection of voltage transformer

      Connection of voltage transformer

     A lot of connection of voltage transformer, there are several common:

    (1) Connection with a single-phase voltage mutual inductor to measure a relatively voltage or phase voltage.

    (2) Using two single-phase transformers with not completely star,also known as V - V junction, used to measure the voltage between phases, but can not be measured relative to the voltagebelow 20KV, widely used in neutral non grounded and Petersen coil grounded power system.

    (3) Using three single-phase three winding voltage transformer iscomposed of YN, YN, d0 or YN, y, connection of d0, widely used in 3~220KV system, the secondary winding is used to measurethe phase to phase voltage and phase to ground voltage, twosecondary windings are connected into an open triangle, foraccess AC grid insulation monitoring instrument and relay. Wiringwith a three-phase five limb transformer instead of the three single-phase three winding voltage transformer is composed ofiron core, in addition, the form and figure 3 is basically the same,generally used only for 3~15KV system.

    (4) The capacitor voltage transformer connection.

     In neutral non grounded and Petersen coil grounded system in, in order to measure the relative voltage, PT a winding must beconnected into a star grounding way.

In 3~60KV power network, usually adopts the connection of threesingle-phase three winding voltage transformer or a three-phase five limb transformer voltage.

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      It must be pointed out, can not be used in three-phase three limb transformer do this measurement.When the single-phase grounding fault occurs in a three-phasesystem, the transformer with zero sequence current produced by,equal in magnitude, phase of the same zero flux. In the three-phase three limb transformer, zero flux can only form a closed magnetic circuit reluctance by large air gap and the iron shell,zero sequence current, the transformer winding overheating and even damaged equipment. In the three-phase five limbtransformer, zero flux can constitute a loop, through the sides of the iron core reluctance is small, so the zero sequence current value is small, does not cause damage to the transformer.

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The basic function of voltage transformer

     Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains, sprockets and plate wheels, transmission chain，conveyor chain,pulleys, gearboxes, motors, couplings, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes. 

     The voltage transformer is a transformer core. It mainly consists of one or two secondary coil, core and insulation. When applying a voltage of U1 in a winding, produces a flux φ in the core, according to the law of electromagnetic induction, is in the two winding generates a two voltage U2. 

      The number of turns to change one or two winding, can produce a different voltage and the two voltage ratio, which can be composed of different ratio of voltage transformer. Voltage transformer high voltage into low voltage, according to the proportion of 100V, a voltage transformer connected in a system, the two side is connected with the measuring instrument, relay protection; mainly electromagnetic (capacitive voltage transformer is widely used), otherwise non electromagnetic, such as electronic, photoelectric

Basic function

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     The voltage transformer is the role of the high voltage proportionalrelationship: transform into 100V or lower grade standard two voltage, for protection, measurement, instrument use. At the same time, the use of voltage transformer can be high voltage and electrical personnel isolation. Voltage transformer areworking according to the principle of electromagnetic inductiondevice, but compared to the relationship between electromagneticstructure and current transformer and its opposite.

      The two circuit for voltage transformer is a high impedance circuit, the twocurrent is decided by the size of the loop impedance. When the load impedance is reduced two times, two times the current increases, so that a single current automatically increases acomponent to meet the electromagnetic balance the relationship between the one or two side. Can. Can say, the voltage transformer is a transformer is limited to special structure andform. That is "simple detection element".

   

The main types of voltage transformer

      The voltage transformer is a transformer core. It mainly consists of one or two secondary coil, core and insulation. When applying a voltage of U1 in a winding, produces a flux φ in the core, according to the law of electromagnetic induction, is in the two winding generates a two voltage U2. The number of turns to change one or two winding, can produce a different voltage and the two voltage ratio, which can be composed of different ratio of voltage transformer. 

     Voltage transformer high voltage into low voltage, according to the proportion of 100V, a voltage transformer connected in a system, the two side is connected with the measuring instrument, relay protection; mainly electromagnetic (capacitive voltage transformer is widely used), otherwise non electromagnetic, such as electronic, photoelectric

    Type

     By the installation site can be divided into indoor and outdoor.35kV and below made more indoor type; 35kV and above is made of outdoor type.

     According to the number of phases can be divided into single-phase and three-phase, 35kV and above can not be made intothree-phase.

     Press the winding number can be divided into two winding and three winding voltage transformer, three winding voltage transformer in addition to a side and two side, and a set of auxiliary two side, for grounding protection.

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     The press insulation can be divided into dry, cast type, oil immersed and inflatable. Dry type voltage transformer has the advantages of simple structure, no fire and explosion danger, but the insulation strength is low, indoor type device only applies to the following 6kV; the structure of the casting voltage transformerhas the advantages of compact structure, convenient maintenance, suitable for 3kV ~ 35kV indoor distribution device;oil immersed transformer insulation performance is good, can be used for more than 10kV outdoor type distribution device;pneumatic type voltage transformer for SF6 full closed electric appliance.

According to the working principle of the division, can be divided into electromagnetic voltage transformer, capacitor voltagetransformer and electronic voltage transformer.

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     Our products are used in many different industry sector, like in automation engineering, drive engineering, conveyor technology, assembly and handling technology,hollow Pin Chain， packaging industries, the beverage, food and medical engineering, timing pulley,pharmaceutical production, and laboratory equipment.

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Introduction of the voltage transformer

      Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains, sprockets and plate wheels, Chain guides，pulleys, gearboxes, motors, couplings, engineering Chain，gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes. 

     Voltage transformer and transformer alike, are used to transformthe voltage on the line. But the transformer voltage is designed todeliver power, therefore, large capacity, is generally based onKVA or MVA as the calculating unit; and the voltage transformer totransform voltage, is mainly used to supply power to themeasuring and relay protection device, used to measure line voltage, power and energy, or to precious equipment, circuitprotection when line fault when motor and transformer, so the voltage transformer capacity is very small, generally only a fewvoltammetry, dozens of voltammetry, the maximum not more than one thousand volt ampere.

     Why need to transform the voltage on the line? This is because,according to the power generation, transmission and use differentelectric voltage on the line, not one, but the difference between220V and 380V, and some are low, some tens of thousands of volts or even hundreds of thousands of volts of high voltage. Todirectly measure the low voltage and high voltage, need according to the line voltage, the production of the corresponding low and high voltage meter and other instruments and relays. This will not only bring great difficulties to the instrument making, but more importantly, to direct production pressure meter, measuring voltage directly on the high-pressure line, it is not possible, and it is absolutely not allowed.

     The basic structure and transformer voltage transformer is very similar, it also has two windings, a primary winding, a twowinding. The two windings are installed on or around the core.There are two windings and insulation between the winding and core, made between two windings and the winding and core areelectrical isolation. Voltage transformer in operation, a primary winding N1 and join the online way, two secondary windings N2and join the instrument or relay. So the voltage in themeasurement of high pressure on the line, although a very high voltage, but the two is low, can ensure that the operating personnel and instrument security.

    

Displacement sensor according to according to the materialclassification

     Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains, sprockets and plate wheels, taper lock sprocket,pulleys, gearboxes, motors, Timing Belt Pulleys,couplings, gears and racks. 

     Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes. 

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   Potentiometer displacement sensors: 

    The mechanicaldisplacement into a linear or any function of the resistance or voltage output and the potentiometer elements. General linear and circular potentiometer potentiometer can be used as a linear displacement and angular displacement sensor. However,designed to achieve the purpose of measuring displacementpotentiometer, requirements between the displacement variationand resistance variation has a definite relationship. Figure 1 thepotentiometer displacement sensors and the object to be measured is connected with the movable brush. 

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     Object displacement resistance change caused by mobile terminalpotentiometer. Variable resistance reflects the displacement value, increase or decrease the resistance that the displacementdirection. Usually pass on the potentiometer to the supply voltage,to the resistance change is converted to a voltage output. Wire wound potentiometer wiper is moved due to its resistance to change turn resistance ladder, the ladder shaped output characteristic was also found. If this displacement sensor used in the servo system position feedback device, is too large a step voltage will cause system oscillation. Therefore, the production of the potentiometer should be to minimize the resistance of each turn. Another major drawback potentiometer type sensor is easy to wear. Its advantages are: simple structure, large signal output,convenient use, low price.

     Hall displacement sensor: principle of measurement is to maintain its hall element (see semiconductor magnetic sensingelement) of the excitation current constant, and the moving in a uniform magnetic field gradient, then move the displacement is proportional to the output of the Huo Er potential. The greater the magnetic field gradient, the higher the sensitivity; gradient moreuniform, the relationship between the Hall potential and displacement is more close to linear. 

     Figure 2 is the threegeneration gradient magnetic field system: the linear range of a system is narrow, the displacement Z=0, the Hall potential = 0; B system when Z<2 mm with good linear, Z=0, Hall electric potential =0; the sensitivity of C system, the measurement range is less than 1 mm. Figure N, S positive, negative pole respectively. Hall displacement sensor of small inertia, high frequency response,reliable work, long service life, so commonly used in a variety ofnon electricity and then converted into the displacementmeasurement.

    Photoelectric displacement sensor: it according to the displacement or geometric size of the measured object blockingoptical flux measurement of object. Characterized by a non-contact measurement, and can continuously measure.Photoelectric displacement sensor used in the continuousmeasurement of wire diameter or the strip edge position control system for edge position sensor.

    

Displacement sensor according to the mode of motion classification

    The main classification

    According to the mode of motion

    Linear displacement sensor:

   Function of linear displacement sensor is the linear mechanical displacement into an electrical signal.

In order to achieve this effect, usually slide set variable resistorfixed part of the sensor, to measure the different resistance bydisplacement slide on the slide way. Sensor rail connectionsteady DC voltage, allowing small current flowing through themicro ampere, voltage slide and end between the mobile, and the length of vane. The sensor can be used as a divider rails to minimize the total resistance of the requirements of accuracy,because the resistance caused by the change of temperaturechange will not affect the measurement results.

Linear Bearing

    Angle displacement sensor:

    Angle displacement sensor in the application of the obstacles:find obstacles using the angle sensor to control your wheels can be indirectly. The principle is very simple: if the motor angle sensor structure operation, while the gear does not turn, that yourmachine has been the obstacle to block. This technique is very simple to use, and very effective; the wheels can not only requirement is the movement of the slipping on the floor (orslipping too many times), otherwise you will not be able to detectobstacles. An idle gear connected to the motor can avoid this problem, the wheels instead of by means of the motion to drive itis driven by the motor: on the driving wheel rotation process, if theidler wheel stopped, you run into obstacles.

     Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China.  

     Our products are used in many different industry sector, like in automation engineering, drive engineering, conveyor technology,Chain guides，assembly and handling technology,Fluid Couplings， packaging industries, the beverage, food and medical engineering, pharmaceutical production, and laboratory equipment.