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Transformers(Number of phases/winding:Other)

A transformer is a device that changes the voltage, also called a power transformer. Performs the step-down and step-up of AC voltage, and makes adjustments necessary for use in electronic devices. The transformer has a structure in which a primary coil and a secondary coil are wound around an iron core. Depending on the position of the iron core and the coil, it is divided into an inner iron type where the coil covers the iron core and an outer iron type where the iron core is outside the coil. Wiring methods are classified into two types: single-phase, which is a 100 V power supply used in offices, and three-phase, which is a 200 V power supply that sends a large amount of power. The winding of the coil is usually compound wound in which the primary and secondary sides are insulated, but there are also smaller auto transformers. There are also types that can be connected with the cover attached, types that can be used overseas and in Japan, portable types that are suitable for on-site construction with different power and voltage, etc.
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  • You can add up to 6 items per a category to the compare list.

    AC Current Transformer (KTA Series)

    AC Current Transformer (KTA Series)

    LIGHTSTAR

    AC Current Transformer KTA Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 1,480,012 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Commercial Frequency Socket Converter (KSF Series)

    Commercial Frequency Socket Converter (KSF Series)

    LIGHTSTAR

    Commercial Frequency Socket Converter KSF Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 2,862,914 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Single-Phase/Three-Phase Transformer Case, BK Series

    Single-Phase/Three-Phase Transformer Case, BK Series

    SWALLOW ELECTRIC

    BK series. Indoor transformer case. (Paint color· Munsell color system 5Y7/1)

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - 0.5 or Less ~ 50 - Other - - 135 ~ 550 - Available - 180 ~ 410 150 ~ 500
    From: 1,704,735 VND
    Days to Ship: Số ngày giao hàng: 6 Day(s) or more
    day to ship 6 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Potential Transformer

    Potential Transformer

    LIGHTSTAR

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    220 ~ 440 0.015 ~ 0.05 110 Other - - - - - - - -
    From: 2,681,746 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Commercial Frequency Converter (KTF Series)

    Commercial Frequency Converter (KTF Series)

    LIGHTSTAR

    Commercial Frequency Converter KTF Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 3,271,990 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Pulse into Analog Converter (KTK Series)

    Pulse into Analog Converter (KTK Series)

    LIGHTSTAR

    Pulse-to-Analog Converter KTK Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 3,271,990 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    AC Current Socket Converter (KSA Series)

    AC Current Socket Converter (KSA Series)

    LIGHTSTAR

    AC Current Socket Converter KSA Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 2,454,149 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    DC Isolation Converter (KTD Series)

    DC Isolation Converter (KTD Series)

    LIGHTSTAR

    DC Isolation Converter KTD Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 3,271,990 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Resistance Temperature Converter (KTP Series)

    Resistance Temperature Converter (KTP Series)

    LIGHTSTAR

    Resistnace Temperature Converter KTP Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 3,271,990 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    WORLD Series, Transformer For Use Overseas

    WORLD Series, Transformer For Use Overseas

    SWALLOW ELECTRIC

    WORLD series, with manual input voltage changer. Can be used in different countries by capacity of input voltage in range of 110 to 240V.

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    AC110 to 240 0.12 ~ 0.3 AC100 Other - - 50 ~ 120 NA Available - 82 ~ 155 46 ~ 128
    From: 4,137,209 VND
    Days to Ship: Số ngày giao hàng: 6 Day(s) or more
    day to ship 6 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    S Series

    S Series

    AIHARA

    Reference color transformer case of indoor standard:Munsell color system 5Y7/S series of 1 (semigloss)

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - 0.05 ~ 0.2 - Other - - 113 ~ 158 - NA - 120 ~ 160 170 ~ 240
    From: 1,854,868 VND
    Days to Ship: Số ngày giao hàng: 4 Day(s) or more
    day to ship 4 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Transformer AVR-E Series, AC Constant Voltage Power Supply Unit

    Transformer AVR-E Series, AC Constant Voltage Power Supply Unit

    SWALLOW ELECTRIC

    AVR-E series, product with auto-shift in range of 170 to 260V for Japanese electronic products. Most suitable product for unstable voltage places.

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    AC170 to 260 1.5 ~ 2 AC100 Other - - 235 ~ 300 NA Available - 145 ~ 210 150 ~ 250
    From: 12,204,679 VND
    Days to Ship: Số ngày giao hàng: 6 Day(s) or more
    day to ship 6 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    AC Voltage Converter (KTB Series)

    AC Voltage Converter (KTB Series)

    LIGHTSTAR

    AC Voltage Converter KTB Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 1,480,012 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    AC Power/Electric Power Transformer (KTG/KTW Series)

    AC Power/Electric Power Transformer (KTG/KTW Series)

    LIGHTSTAR

    AC Power (KTG Series) / Electric Power (KTW Series) Converter. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 4,089,832 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Power Factor Transformer KTH Series

    Power Factor Transformer KTH Series

    LIGHTSTAR

    Power Factor Converter KTH Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 4,089,832 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Reactive Power Transformer (KTI Series)

    Reactive Power Transformer (KTI Series)

    LIGHTSTAR

    Reactive Power Converter KTI Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 4,089,832 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Potential Difference Converter (KTL Series)

    Potential Difference Converter (KTL Series)

    LIGHTSTAR

    Potential Difference Converter KTL Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 3,271,990 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Digital Signal DC Power Converter (KTM Series)

    Digital Signal DC Power Converter (KTM Series)

    LIGHTSTAR

    Digital Signal DC Power Converter KTM Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 8,179,664 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    AC Voltage Socket Converter (KSB series)

    AC Voltage Socket Converter (KSB series)

    LIGHTSTAR

    AC Voltage Socket Converter KSB Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 2,454,149 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    DC Insulated Socket Converter (KSD Series)

    DC Insulated Socket Converter (KSD Series)

    LIGHTSTAR

    DC Insulated Socket Converter KSD Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 2,862,914 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Potential Difference Socket Converter KSL Series

    Potential Difference Socket Converter KSL Series

    LIGHTSTAR

    Potential Difference Socket Converter KSL Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 2,862,914 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
  • You can add up to 6 items per a category to the compare list.

    Resistance Temperature Socket Converter (KSP Series)

    Resistance Temperature Socket Converter (KSP Series)

    LIGHTSTAR

    Resistance Temperature Socket Converter KSP Series. ・Related Keywords: LIGHTSTAR, Light Star, Gwangseong Measurement Instrument corp, Transformer

    Primary voltage(V) Capacity(kVA) Secondary voltage(V) Number of phases/winding Insulation type Input/output terminal shape Dimension vertical(mm) Shield presence With/without Case Representative Standard Dimension width(mm) Dimension depth(mm)
    - - - Other - - - - - - - -
    From: 2,862,914 VND
    Days to Ship: Số ngày giao hàng: 11 Day(s)
    day to ship 11 Day(s)
BrandNhãn hiệu
Product SeriesDòng sản phẩm
From
Days to ShipSố ngày giao hàng
Primary voltage(V)
Capacity(kVA)
Secondary voltage(V)
Number of phases/winding
Insulation type
Input/output terminal shape
Dimension vertical(mm)
Shield presence
With/without Case
Representative Standard
Dimension width(mm)
Dimension depth(mm)

    You can add up to 6 items per a category to the compare list.

    AC Current Transformer (KTA Series)

        You can add up to 6 items per a category to the compare list.

        Commercial Frequency Socket Converter (KSF Series)

            You can add up to 6 items per a category to the compare list.

            Single-Phase/Three-Phase Transformer Case, BK Series

                You can add up to 6 items per a category to the compare list.

                Potential Transformer

                    You can add up to 6 items per a category to the compare list.

                    Commercial Frequency Converter (KTF Series)

                        You can add up to 6 items per a category to the compare list.

                        Pulse into Analog Converter (KTK Series)

                            You can add up to 6 items per a category to the compare list.

                            AC Current Socket Converter (KSA Series)

                                You can add up to 6 items per a category to the compare list.

                                DC Isolation Converter (KTD Series)

                                    You can add up to 6 items per a category to the compare list.

                                    Resistance Temperature Converter (KTP Series)

                                        You can add up to 6 items per a category to the compare list.

                                        WORLD Series, Transformer For Use Overseas

                                            You can add up to 6 items per a category to the compare list.

                                            S Series

                                                You can add up to 6 items per a category to the compare list.

                                                Transformer AVR-E Series, AC Constant Voltage Power Supply Unit

                                                    You can add up to 6 items per a category to the compare list.

                                                    AC Voltage Converter (KTB Series)

                                                        You can add up to 6 items per a category to the compare list.

                                                        AC Power/Electric Power Transformer (KTG/KTW Series)

                                                            You can add up to 6 items per a category to the compare list.

                                                            Power Factor Transformer KTH Series

                                                                You can add up to 6 items per a category to the compare list.

                                                                Reactive Power Transformer (KTI Series)

                                                                    You can add up to 6 items per a category to the compare list.

                                                                    Potential Difference Converter (KTL Series)

                                                                        You can add up to 6 items per a category to the compare list.

                                                                        Digital Signal DC Power Converter (KTM Series)

                                                                            You can add up to 6 items per a category to the compare list.

                                                                            AC Voltage Socket Converter (KSB series)

                                                                                You can add up to 6 items per a category to the compare list.

                                                                                DC Insulated Socket Converter (KSD Series)

                                                                                    You can add up to 6 items per a category to the compare list.

                                                                                    Potential Difference Socket Converter KSL Series

                                                                                        You can add up to 6 items per a category to the compare list.

                                                                                        Resistance Temperature Socket Converter (KSP Series)
                                                                                          BrandNhãn hiệu

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          SWALLOW ELECTRIC

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          SWALLOW ELECTRIC

                                                                                          AIHARA

                                                                                          SWALLOW ELECTRIC

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          LIGHTSTAR

                                                                                          Product SeriesDòng sản phẩm

                                                                                          AC Current Transformer (KTA Series)

                                                                                          Commercial Frequency Socket Converter (KSF Series)

                                                                                          Single-Phase/Three-Phase Transformer Case, BK Series

                                                                                          Potential Transformer

                                                                                          Commercial Frequency Converter (KTF Series)

                                                                                          Pulse into Analog Converter (KTK Series)

                                                                                          AC Current Socket Converter (KSA Series)

                                                                                          DC Isolation Converter (KTD Series)

                                                                                          Resistance Temperature Converter (KTP Series)

                                                                                          WORLD Series, Transformer For Use Overseas

                                                                                          S Series

                                                                                          Transformer AVR-E Series, AC Constant Voltage Power Supply Unit

                                                                                          AC Voltage Converter (KTB Series)

                                                                                          AC Power/Electric Power Transformer (KTG/KTW Series)

                                                                                          Power Factor Transformer KTH Series

                                                                                          Reactive Power Transformer (KTI Series)

                                                                                          Potential Difference Converter (KTL Series)

                                                                                          Digital Signal DC Power Converter (KTM Series)

                                                                                          AC Voltage Socket Converter (KSB series)

                                                                                          DC Insulated Socket Converter (KSD Series)

                                                                                          Potential Difference Socket Converter KSL Series

                                                                                          Resistance Temperature Socket Converter (KSP Series)

                                                                                          From

                                                                                          1,480,012 VND

                                                                                          2,862,914 VND

                                                                                          1,704,735 VND

                                                                                          2,681,746 VND

                                                                                          3,271,990 VND

                                                                                          3,271,990 VND

                                                                                          2,454,149 VND

                                                                                          3,271,990 VND

                                                                                          3,271,990 VND

                                                                                          4,137,209 VND

                                                                                          1,854,868 VND

                                                                                          12,204,679 VND

                                                                                          1,480,012 VND

                                                                                          4,089,832 VND

                                                                                          4,089,832 VND

                                                                                          4,089,832 VND

                                                                                          3,271,990 VND

                                                                                          8,179,664 VND

                                                                                          2,454,149 VND

                                                                                          2,862,914 VND

                                                                                          2,862,914 VND

                                                                                          2,862,914 VND

                                                                                          Days to ShipSố ngày giao hàng 11 Day(s) 11 Day(s) 6 Day(s) or more 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 6 Day(s) or more 4 Day(s) or more 6 Day(s) or more 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s) 11 Day(s)
                                                                                          Primary voltage(V)---220 ~ 440-----AC110 to 240-AC170 to 260----------
                                                                                          Capacity(kVA)--0.5 or Less ~ 500.015 ~ 0.05-----0.12 ~ 0.30.05 ~ 0.21.5 ~ 2----------
                                                                                          Secondary voltage(V)---110-----AC100-AC100----------
                                                                                          Number of phases/windingOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOtherOther
                                                                                          Insulation type----------------------
                                                                                          Input/output terminal shape----------------------
                                                                                          Dimension vertical(mm)--135 ~ 550------50 ~ 120113 ~ 158235 ~ 300----------
                                                                                          Shield presence---------NA-NA----------
                                                                                          With/without Case--Available------AvailableNAAvailable----------
                                                                                          Representative Standard----------------------
                                                                                          Dimension width(mm)--180 ~ 410------82 ~ 155120 ~ 160145 ~ 210----------
                                                                                          Dimension depth(mm)--150 ~ 500------46 ~ 128170 ~ 240150 ~ 250----------

                                                                                          Loading...Tải…

                                                                                          1. 1

                                                                                          Related Categories to TransformersDanh mục liên quan đến Transformers

                                                                                          FAQ Transformers

                                                                                          Question: What is different between 1phase transformers and 3phase transformers.
                                                                                          Answer: 1. In a single-phase transformer, the electricity is supplied through two wires called Line and neutral. In three phase transformers, the electricity is supplied through three wires (four wires if neutral wire is included).
                                                                                          2. The voltage of single-phase transformer supply is 230V whereas three-phase transformer supply is 415V.
                                                                                          3. The efficiency of a three-phase transformer is significantly higher than a single-phase supply and the power transfer capability is also more.
                                                                                          Question: How many types of transformers?
                                                                                          Answer: Type of transformer can be separated by different types of applications.
                                                                                          1. Transformer types based on core structure.
                                                                                             1.1) Iron core transformer
                                                                                             1.2) Shell core transformer
                                                                                             1.3) H-type core transformer
                                                                                          2. Transformer types based on electric system.
                                                                                             2.1) Single-phase transformer
                                                                                             2.2) Three-phase transformer
                                                                                          3. Transformer types based on voltage level.
                                                                                             3.1) Step-up transformer which is use for boost voltage up then transmit to secondary side.
                                                                                             3.2) Step-down transformer which is use for reducing voltage down then transmit to secondary side.
                                                                                             3.3) Isolation transformer which voltage at primary and secondary side are same. Typically, applicable for Laboratory which is need stable voltage and current.
                                                                                          Question: How is transformer maintenance method?
                                                                                          Answer: 1. Should install and using in low-humidity to prevent short circuit issue.
                                                                                          2. Installation place should be good for heat transfer.
                                                                                          3. Always keep cleaning heat transfer component.
                                                                                          4. Always keep inspection terminal and wire.
                                                                                          Question: Why transformer is necessary?
                                                                                          Answer: Transformers is necessary because each electric device need different level of voltage. So, we must use transformer to adjust the electrical voltage from power source to sub-unit. Such as, reduce voltage from high-power electric post to the building and transformer for reduce voltage level from electric source of building to each electrical home appliance as well.