Household meter selection

Household meter choices, mainly from product quality, meter function, measurement accuracy is selected.
1, as in the case of other factors, the product quality is very important, it is not necessarily a good expensive, good certain  power transformers , but better to choose the brand manufacturers, there is a certain quality of protection, will not use a few day burned.
2, the meter functions. The meter is now there have been many kinds of functions, active tables, reactive watches,  Voltage stabilizer , electronic watches, need to scale, multi-table, TOU table and so on. Here it is necessary to see the specific use request. Now multifunctional electronic watches, can integrate multiple measurement functions, but

Is expensive. General mechanical watch can be measured separately one or several functions, the price is relatively cheap. Critical look needs circumstances.
3, the measurement accuracy. Different requirements, the meter accuracy required is not the same. Average household electricity, with more than 2.0 meter accuracy is sufficient, and in large enterprises, mark the meter, the need is 0.5, or even 0.2 meter accuracy. The higher the accuracy, the price is more

High. This point should also look to use needs.

Household meter works

Common meter: We are now household meter Power Meter, which records the electrical consumption of active energy, reactive energy is not recorded, for ordinary light bulbs, electric and other Voltage stabilizer  wire heating element is only active energy consumption , and some have a sense of inductive or tolerance of the load (Motors, televisions, air conditioners, fluorescent lamps, etc.), in addition to active energy  power transformers , there are reactive energy consumption. That is, as the load on the felt is the active power and reactive power of the vector sum, difference of 90 degrees between them, as in the "degree" function of course be greater than

Meter record of active degrees.
But no sense of power consumed by the load is 100% recorded in the meter on, is not through any electrical load in parallel to reduce the active power consumption.
Load on the felt, meter records only active energy consumption, many users do not worry about recording power meter.
In order to reduce the external electrical active energy can only be the gimmick, unless more than usual attention to conserve electricity. 2 IC card meter is inside the base table, host microcontroller chip, digital display, relay switch, ESAM module and IC card interface.

Gives users the benefits of smart meters

Smart meters compared with ordinary mechanical energy meter has a measurement more accurate, intelligent deductions, price inquiries, power memory, balance alarm, remote transmission of information  power transformers . The power companies, the use of smart meters can save the cost of manual meter reading, stealing and reduce losses. Except

Beyond this, the power companies use  mcb circuit breaker  to obtain the customer's electricity consumption data, then use the Internet in real time back to the user's reference, customers can according to diversify electricity time (due to high rates during peak hours) for electricity use management, to save electricity cost effectiveness.

For the government, the smart meter will help users save electricity, you can achieve energy saving and carbon reduction policy objectives. For the user, can save electricity costs, users can take advantage of peaks and valleys of electricity price differences autonomous customized solutions to achieve the same power, spend the least money

Permanent magnet AC contactor works

Is the use of permanent magnet AC contactor poles repel each other, opposite sex attraction principle, permanent  power transformers  mechanism to replace the traditional magnet drive mechanism and the formation of a micro-power contacts. Linkage mechanism mounted on the contactor of the permanent magnet fixed polarity, and curing the contactor end

The variable base soft magnetic polar interaction, so as to pull, to maintain and release purposes. The variable electric transformer is cured together with an electronic module generates a dozen to two dozen milliseconds forward and reverse pulse current, and to produce different polarities. According to the site

Need, with the control electronics module to control the release of the set voltage value, can also be a delay before issuing reverse pulse current to reach the low-voltage power-off delay release delayed release or purpose to control the motor from Akira power grid and a jump stop, so as to maintain the stability of the production system

AC contactor

Contactor mainly by electromagnetic system, contact system, arc system and other components.

① electromagnetic system: electromagnetic system comprises an electromagnetic coil and the core, is an important  air circuit breaker  contactor, driven by virtue of its contacts closed and disconnected.

② contact system: contactor contacts is the operative part, including the main contacts and auxiliary contacts. The role of the main contact making and breaking main circuit, control larger currents, while the auxiliary contacts are in the control loop, in order to meet the requirements of various control methods.

③ interrupter system: arc extinguishing device opens the circuit to guarantee contact, the resulting arc  power transformers  reliability, reduce damage to the arc of contact. In order to rapidly extinguish the arc when disconnected, usually contactors are equipped with interrupter device, generally semi-sealed longitudinal seam clay interrupter cover and

Equipped with magnetic arc blow loop.

④ Other parts: an insulating housing, springs, short-circuit ring, transmission and so on.

A stabilizer

It is easy to decompose hydrogen peroxide, some impurities (such as enzymes, angular solid, metal ions, metal shavings, etc.) exists, will catalyze the decomposition of hydrogen peroxide, which would produce an invalid decompose to HO2, HO ·, O2, etc., their great damage to the fabric. Decomposition of hydrogen peroxide to make uniform, stable, power transformersand sufficient use of hydrogen peroxide and minimize damage to the fiber, often in the bleaching solution by adding a stabilizer, a stabilizer to prevent mcb circuit breakermainly catalytic reduction of hydrogen peroxide decomposition is invalid . In addition, stabilizers must also alkali, high temperature, resistance to oxidation. The most commonly used stabilizers are sodium

Common abnormal voltage transformer

⑴ unbalanced three-phase voltage indication: a phase reduction (to zero), and the other two-phase normal line voltage is not normal, or accompanied by sound, light

signals, it may be high or low voltage power transformers fuse blown;
⑵ neutral non-effectively grounded system, three-phase voltage unbalance indication: a phase reduction (to zero), and the other two-phase increased (up to line

voltage) or pointer swings, may be single-phase ground fault or baseband resonance such as three-phase voltage also increased, and more than line voltage (refer to

Needle can be placed on the head), it may be divided or high frequency resonant;
⑶ high voltage fuse repeatedly blows, serious damage may be internal insulation, such as the interlayer or inter-turn winding short-circuit fault;
⑷ effectively earthed neutral system, the bus switching operation occurs when the phase voltage increases and low swing, usually a series resonant phenomenon; without

any operation, the sudden appearance of the phase voltage is abnormal increase or decrease, it may be transformer internal insulation damage, such as insulating

support

Stand around, sometimes winding layers TURN SHORT CIRCUIT;
⑸ neutral effectively grounded system, put into operation when voltage electric transformer voltage meter indicates instability, may be high voltage winding N (X) is grounded

poor contact.
(6) floating potential discharge, may be connected to the core through the core bolts and loose, causing the bolt in the floating potential; metallic foreign body in

the floating potential discharge; insulated bracket nut potential suspension;
(7) arc discharge, and can be discharged cascade winding on the core, the insulating supporting frame and the discharge poor; insulated water wet; ungrounded end of

the primary winding;
(8) Heat Fault

Voltage transformer works

It works the same transformer, the basic structure is the core and the primary and secondary windings. Characterized by a constant and relatively small capacity, when

normal operation is close to empty state.
Impedance voltage transformer itself is small, once the secondary side short circuit, the current will increase dramatically and burned coils. To this end, the voltage

transformer primary side is connected with fuses, the secondary grounded, so the primary and secondary side insulation is damaged, the secondary appeared on the ground

caused by the high potential

Personal and equipment accidents.
Measuring voltage power transformers are generally made of a single-phase double-coil structure, and its primary side voltage is measured voltage (such as the power system

line voltage), you can use single-phase can also be used as a two-phase connected into VV-shaped be used. Laboratory voltage transformer primary side is often more

pumping

Head to suit the needs of different voltages measured. For protective grounding voltage transformer also comes with a third coil, said three coil voltage transformers.

The third phase coils connected in open delta, the opening of the triangle two terminals and the ground voltage protection relay

Coil connection.
Normal operation, the symmetrical three-phase voltage power system, the third coil of the three-phase induced electromotive force is zero. In the event of single-

phase, the neutral point displacement occurs, open triangle will appear between the terminals so that the zero-sequence voltage relay to the power system

Statistics play a protective role.
The zero-sequence voltage coil corresponding iron hearts will be zero-sequence flux. To this end, this three-phase voltage electric transformer yoke iron core using the next

(10KV and below) or using three single-phase voltage transformer. For this transformer, the accuracy requirements of the third coil is not

High, but requires a certain degree of over-excitation characteristics (ie, when the primary voltage is increased, the iron core is also a corresponding increase in

the magnetic flux density in multiples without damage).
Voltage transformers are power plants, substations and other transmission and distribution system is indispensable to a electrical appliances.
Precision voltage transformer is used to electrically test laboratories to expand the range, the measured voltage, power and energy of an instrument.
Voltage transformer and the transformer is very similar, are used to transform the voltage on the line.
Why do we need convert line voltage it? This is because under the generation, transmission and consumption of different circumstances, the voltage on the line sizes,

and disparities, some low-voltage 220V and 380V, some tens of thousands of volts or even hundreds of thousands of high-voltage volts . To directly measure this

These low and high voltages, it is necessary according to the size of the line voltage, low-voltage and high-voltage production of the corresponding voltage tables and

other instruments.