Что такое разделительный трансформатор: «Что такое разделительный трансформатор ?» – Яндекс.Кью

Разделительный трансформатор — принцип работы и назначение

Разделительный трансформатор – это устройство, которое предназначено для так называемого гальванического разделения потребителей электроэнергии и питающей их электрической сети. 

Основной задачей подобного устройства можно назвать повышение безопасности за счет того, что у такого оборудования, как разделительный трансформатор, отсутствуют во вторичных цепях электрические связи с землей или с источниками напряжения, выполненными в виде глухозаземленной или эффективно заземленной нейтрали на трансформаторных подстанциях.

В данной ситуации даже возникновение возможного электрического пробоя на корпусе не будет вызывать перегрузки по электротоку. Сам прибор будет при этом оставаться в абсолютно исправном и рабочем состоянии. При случайном прикосновении человека к части устройства, которая, соответственно, находится под аварийным напряжением, ток утечки не превысит жизненноопасного уровня для человека, и в результате трагедии можно будет избежать.

Разделительный трансформатор будет не лишним не только на промышленных предприятиях, но даже дома. Особенно, если имеется домашняя мастерская.

В основе такого устройства, как трансформатор разделительный, лежит так называемый ТС ( трансформатор унифицированный). Так как современные бытовые электрические приборы бывают различной энергоёмкости и мощности, унифицированные трансформаторы также берут с расчетом на самые разные типы нагрузки и величины мощности нагрузки.

Эффект разделения и отсутствия электрической связи ( что приводит к так называемой гальванической развязке по напряжению, которое питает прибор, и по напряжению, которое подается от линий электрического снабжения) достигается весьма просто. Разделительный трансформатор имеет в своей конструкции две обмотки – вторичную и первичную. Между ними устанавливается усиленная ( не менее чем двойная) изоляция или металлический заземленный кран, который позволяет гарантировать избежание пробоя. Так как разделительный трансформатор не предназначен для преобразования напряжения, то его коэффициент трансформации обычно равен единице. При этом напряжение на входе будет отличаться от напряжения на выходе.

Однако в чем тогда смысл использования такого трансформатора? Это легко продемонстрировать на примере, если во влажном месте, например, в ванной комнате есть электроточка без гальванической развязки. В случае, если в такую точку попадет влага, произойдет пробой изоляции. Как следствие, некоторый участок стены и незаземленные электроприборы рядом с ним попадут под воздействие напряжения.

Если будет пробой изоляции и при разделительном трансформаторе, то та же часть стены тоже может оказаться под напряжением, однако в этом случае ток будет самый минимальный. А если пробоя изоляции нет, расчет такого устройства, как разделительный трансформатор, выбран правильно, то тока или напряжения не будет вообще.

Такое устройство используют часто в медицине.Есть возможность использовать его как выходной трансформатор либо как связующий трансформатор для согласования сопротивления цепи.

90000 What is an Isolation Transformer? 90001 90002 An isolation transformer is made of two copper coils that are wound around each other and are each supplied by their own power source. While the term «isolation transformer» technically refers to any transformer, it is specifically a transformer that isolates a circuit from an alternating current. An isolation transformer does this by separating two circuits with an induction loop or decreasing the alternating current’s voltage before it reaches the circuit itself.90003 90002 90005 How Isolation Transformers Work 90006 90007 Isolation transformers work in the same way as other types of transformers. The isolation transformer is made of two electromagnets that are wound around each other in order to allow the primary coil to induce a current in the secondary coil. If the primary coil is wound more than the secondary coil, the voltage is decreased. If the secondary coil is wound more than the primary coil, the voltage is increased. An isolation transformer could have primary and secondary coils that are wound the same in order to keep the same voltage but separate two circuits by inducing a current from one coil to the other rather than having a direct connection.90008 90003 90002 90005 Applications 90006 90007 Isolation transformers are found in many different electronic devices that have circuits that are too sensitive to handle an alternating current directly. They can be seen as power adapters for laptop computers, cell phones, and most other electronic devices. This is because the voltage levels that are supplied to homes and other establishments is much higher than the voltage that electronic devices require due to low electrical loss at higher voltages and higher transfer rates over long distances.As a result, most electronic devices must include an isolation transformer to decrease the voltage before it reaches the device. 90003 90002 90005 Advantages 90006 90007 Isolation transformers increase and decrease alternating currents. They can be built to scale and generally handle any amount of voltage necessary, depending on how many times the coils are wound. Isolation transformers reduce electrical and electromagnetic interruptions from other power sources and devices and improve signal strength in radio and wireless communication systems.90003 .90000 Know More about Electrical Isolation Transformers and Auto Transformer 90001 90002 Isolation Transformers 90003 90004 A transformer is a device that transfers electric power from one circuit to another circuit without changing frequency. It contains primary and secondary winding wherein the primary winding is connected to the main circuit and the secondary winding to a required load circuit. An Isolation transformer is defined as the primary and secondary windings of the transformer separated from each other.90005 90006 90006 Isolation Transformers 90008 90008 The winding of isolation transformer 90004 The input and output powers in a transformer are magnetically coupled since the transformer design is made by using a dielectric insulation barrier. An isolation transformer isolates load in an electrical system to prevent the equipment from getting spikes and harmonics from the mains as shown in the figure. Such a transformer is also known as an insulating transformer. 90005 90004 An Isolation transformer with an electrostatic shield is used for sensitive equipment such as computers and laboratory instruments.The turn ratio determines whether the transformer is used: to step-up or step-down or for unchanged voltages. This transformer can be used in different applications like portable electric tools and electric traction, and so on. 90005 90004 Isolation transformers ‘classification depends on the winding arrangement, construction, and the alternating current type involved. 90005 90016 Classification Based on Winding Arrangement 90017 90018 90019 Some transformers capable of producing an output voltage that is identical to their input are known as 1: 1 isolation transformers.90020 90019 A Step-up transformer produces an output voltage greater than its input voltage. 90020 90019 A Step-down transformer produces a smaller output relative to its input. 90020 90025 90026 90026 Step-up transformer 90004 90029 Step-Up Transformer 90030: This type of transformer has more number of turns in the secondary winding and less in the primary such that the voltage is more in the secondary when compared to the primary as shown in the figure. The number of turns in both the windings is decided by the application rating requirement.Step-up transformers are used as boosters power transmission lines. 90005 90032 90032 Step-down transformer 90004 90029 Step-Down Transformer 90030: This type of transformer reduces the mains supply voltage too low values ​​depending on the load requirement. In a step-down transformer, the primary winding consists of more number of turns compared with the secondary winding. 90005 90038 90038 90004 The Relationship between currents, voltages, and turns are in transformation ratio equations that are given below.90005 90004 Voltage transformation ratio = Secondary Turns / Primary Turns 90043 Current transformation ratio = Primary Turns / Secondary Turns 90005 90016 Classification Based on the Nature of Power Supply 90017 90004 An isolation transformer can be manufactured to operate on single and three-phase AC supplies. 90005 90004 90029 Single Phase Transformer 90030: This is manufactured to operate on a single-phase AC supply and is mostly used for low-power applications like residential lighting, air conditioning, and heating, etc.Single-phase transformer can be reconnected in series or parallel based on the requirement of the load. 90005 90053 90053 Single-phase transformer 90004 A Single-phase transformer consists of two windings on a common iron core. If one of the winding is connected to an AC voltage, an alternative magnetic field is set on an iron core. This field coupled with the secondary winding produces an EMF in it. As a result, this EMF drives the current to pass to the load circuit. 90005 90004 90029 Three-phase transformer 90030: This transformer is designed and constructed for specific voltages particularly for higher voltages.The three-phase transformer has three types of windings as both primary and secondary windings are included as three phases. 90005 90061 90061 Three-phase transformer 90004 These windings can be connected in wye (Star) or delta form. The combination of primary and secondary windings can be delta- delta, wye-delta, wye-wye, and delta-wye. This type of configuration depends on the application — like, in the distribution side, delta to star connections transformers are used. 90005 90002 Auto Transformers 90003 90004 An autotransformer consists of only one winding, and part of it acts as a secondary winding.It is smaller, lighter, and cheaper than the dual winding transformer and also possesses lower leakage reactance, higher efficiency, good power quality, and fewer copper requirements. 90005 90004 Though it is advantageous over the conventional one, yet it does not provide any electrical isolation to load from the mains, and is more prone to faults. This type of transformer can be used to step up or step down the voltage by connecting the windings in various configurations. 90005 90071 90071 Auto Transformers 90004 Auto-transformers are used in power transmission, distribution, railways, and audio applications.The turns ratio of a step- down transformer is less than ‘1’, and the turn ratio of a step-up transformer is always greater than ‘1’. 90005 90004 90029 Step-up autotransformer: 90030 This type of autotransformer in which the source voltage is connected to the main winding and the load is connected across the part of the main winding is called a step-up autotransformer. 90005 90004 90029 Step-down autotransformer 90030: This type of autotransformer in which the source voltage is applied to the part of the main winding, and the load is connected to the whole main winding, as shown in the figure.90005 90004 90029 Variable Auto Transformer 90030 90005 90087 90087 Variable Auto Transformer 90004 A variable autotransformer is also known as variac in which the secondary connection through a sliding brush allows the voltage to get vary over a given range. This type of transformer is an AC voltage control that provides a variable AC voltage to the various circuits. Variac transformers can boost the output voltage, which is in excess and twice that of the input voltage. 90005 90004 This autotransformer is equipped with many taps and automatic switch gears that allow it to act as automatic voltage regulators.The top features of the variable autotransformer are high efficiency, low temperature rise, and short-time overload capacity. 90005 90004 After going through the above information, one can easily compare both these transformers. The following are some of the differences that emerge after comparing them. 90005 90095 90095 Isolation transformer Vs Auto Transformer 90004 1. In an isolation transformer, the input is isolated from the output, whereas in an autotransformer, there is no electrical isolation between the input and output.90005 90004 2. An isolation transformer consists of both primary and secondary windings that are wounded on an iron core, whereas an autotransformer consists of one coil that acts both as primary and secondary windings. 90005 90004 3. Due to more windings, isolation transformers require more copper, so the weight is significantly high, whereas autotransformers require fewer windings and small core so these are lighter in weight and less costly for the same rating of isolation transformers. 90005 90004 4.If any surge takes place in the primary winding of the isolation transformer, it sustains to load but the autotransformer maintains the outputs to a specified level, irrespective of the input fluctuations. 90005 90004 5. Low voltage regulation occurs in insulation transformers due to large voltage swings, whereas high voltage regulation takes place in an autotransformer due to smaller voltage swings. 90005 90004 This is all about the transformers. We hope that you might have gained some valuable insights and concepts out of this article, after thoroughly reading it.Furthermore, we encourage you to share your knowledge on this particular topic or electrical and electronic projects as that would become a value proposition for us. However, for further details, suggestions, and comments, you can comment in the comment section below. 90005 90004 90029 Photo Credits 90030 90005.90000 Different Types of Transformers and Their Applications 90001 90002 A transformer is a widely used device in the electrical and electronics domain. It is an electromagnetic device which follows the basic principle of electromagnetism discovered by Michael Faraday. We have covered about 90003 Transformers construction and operation 90004 in detail in previous tutorial. Here we will cover 90003 different types of transformers 90004 used in different types of applications. However, all 90003 types of transformers 90004 follow the same principles but they have different construction method.90009 90002 90009 90012 90003 Transformer Types based on Voltage Level 90004 90015 90002 A Transformer can have multiple types of construction. Transformer does not have any electrical connection from one side to another; still, the two electrically independent coils can conduct the electricity by electromagnetic flux. A transformer can have multiple coils or windings on the primary side as well as on the secondary side. In several cases, multiple primary sides, where two coils are connected in series, often called as a 90003 center tapped 90004.This center tapped condition can also be seen on the secondary side. 90009 90002 90009 90002 Transformers can be constructed in a way that it can convert the voltage level of the primary side to the secondary side. Depending on the voltage level, the transformer has three categories. 90003 Step Down, Step Up and Isolation Transformer 90004. For the Isolation transformer, the voltage level is the same for both sides. 90009 90002 90009 90012 90003 1. Step-Down Transformer 90004 90015 90002 90033 90009 90002 90009 90002 Step down Transformer is used in both Electronics and Electrical domain.A step-down transformer 90003 converts the primary voltage level to a lower voltage 90004 across the secondary output. This is achieved by the ratio of primary and secondary windings. For step-down transformers the number of windings is higher across the primary side than the secondary side. Therefore, the overall winding 90003 ratio of primary and secondary always remains more than 1. 90004 90009 90002 90009 90002 90003 In electronics, 90004 many applications run on 5V, 6V, 9V, 12V, 24V or in some cases 48V.To convert the single phase power outlet voltage 230V AC to the desired low voltage level, Step Down transformers are required. In instrumentation as well as in many electrical types of equipment, Step-Down transformer is the primary requirement for the Power section. 90009 90002 90009 90002 90003 In electrical, 90004 step down transformers are used in electrical distribution system which works on very high voltage to ensure low loss and cost-effective solution for long distance power delivery requirements.To convert the high voltage to a low voltage supply line, Step down transformer is used. 90009 90002 90009 90012 90003 2. Step-Up Transformer 90004 90015 90002 90062 90009 90002 90009 90002 Step Up transformer is exactly opposite of the step-down transformer. Step up transformer 90003 increase the low primary voltage to a high secondary voltage 90004. Again it is achieved by the ratio of primary and secondary winding ratio. For the Step Up transformer, the 90003 ratio of the primary winding and the Secondary winding remains less than 1 90004.That means the number turns in secondary winding is higher than the primary winding. 90009 90002 90003 In electronics, 90004 step up transformers often used in stabilizers, inverters etc where low voltage is converted to a much higher voltage. 90009 90002 90009 90002 90003 A step-up transformer is also used in Electrical power distribution 90004. High voltage is required for power distribution related application. Step up transformer is used in the grid to step up the voltage level before the distribution.90009 90002 90009 90012 90003 3. Isolation Transformer 90004 90015 90002 90089 90009 90002 90009 90002 Isolation transformer does not convert any voltage levels. The Primary voltage and the secondary voltage of an isolation transformer always remain the same. This is because the 90003 primary and the secondary winding ratio is always equal to the 1 90004. That means the number of turns in primary and secondary winding is same in isolation transformer. 90009 90002 90009 90002 The isolation transformer is used to isolate the primary and secondary.As discussed previously, the transformer does not have any electrical connections between primary and secondary, it is also used as an isolation barrier where the conduction happens only with the magnetic flux. 90003 It is used for safety purpose and to cancel noise transfer 90004 from primary to secondary or vice-versa. 90009 90002 90009 90012 90003 Transformer Types based on Core material 90004 90015 90002 The transformer transfers the energy by conducting electromagnetic flux through a core material.Different core materials produce different flux density. Depending on the core materials, several types of transformers are used in the power and electronics domain. 90009 90002 90009 90012 90003 1. Iron Core Transformer 90004 90015 90002 Iron core transformer uses multiple soft iron plates as the core material. Due to the excellent magnetic properties of iron, the flux linkage of the iron core transformer is very high. Thus, the efficiency of the iron core transformer is also high. 90009 90002 90120 90009 90002 90009 90002 The soft iron core plates can be available in multiple shapes and sizes.The coils of the primary and secondary wound or wrapped on a coil former. After that, the coil former is mounted in soft iron core plates. Depending on the core size and shapes, a different type of core plates is available in the market. Few common shapes are E, I, U, L, etc. The iron plates are thin, and multiple plates are bunched together to form the actual core. For example, E type cores are made with thin plates with a look of letter E. 90009 90002 90127 90009 90002 90009 90002 Iron core transformers are widely used and usually heavier in weight and shape.90009 90002 90009 90012 90003 2. Ferrite Core Transformer 90004 90015 90002 A ferrite core transformer uses a ferrite core due to high magnetic permeability. This type of transformer offers very low losses in the high-frequency application. Due to this, ferrite core transformers are used in high-frequency application such as in switch mode power supply (SMPS), RF related applications, etc. 90009 90002 90142 90009 90002 90009 90002 Ferrite core transformers also offer a different type of shapes, sizes depending on the application requirement.It is mainly used in electronics rather than electrical application. The most common shape in the ferrite core transformer is E core. 90009 90002 90009 90012 90003 3. Toroidal Core Transformer 90004 90015 90002 90155 90009 90002 90009 90002 Toroidal core transformer uses toroid shaped core material, such as iron core or ferrite core. Toroids are ring or donut shaped core material and widely used for superior electrical performance. Due to the ring shape, the leakage inductance is very low and offers very high inductance and Q factors.The windings are relatively short and weight is much less than traditional, same rating transformers. 90009 90002 90009 90012 90003 4. Air Core transformer 90004 90015 90002 Air Core transformer does not use any physical magnetic core as the core material. The flux linkage of the air-core transformer is made entirely using the air. 90009 90002 90170 90009 90002 90009 90002 In air core transformer, the primary coil is supplied with alternating current which produces an electromagnetic field around it.When a secondary coil is placed inside the magnetic field, as per the Faraday law of induction, the secondary coil is induced with a magnetic field which further is used to power the load. 90009 90002 90009 90002 However, air core transformer produces low mutual inductance compared to physical core material such as iron or ferrite core. 90009 90002 90009 90002 It is used in portable electronics as well as Radiofrequency related applications. Due to the absence of physical core material, it is very light in terms of weight.Properly tuned air core transformer also used in wireless charging solutions, where the primary windings are constructed inside the charger and the secondary windings are situated inside the targeted device. 90009 90002 90009 90012 90003 Transformer Types based on Winding Arrangement 90004 90015 90002 The transformer can be classified using winding orders. One of the popular types is Auto Winding Transformers. 90009 90002 90009 90002 90003 Auto Winding transformer 90004 90009 90002 Till now, the primary and secondary winding is fixed but in case of an auto-winding transformer, the primary and the secondary coil can be connected in series and the center tapped node is movable.Depending on the center tapped position, the secondary voltage can be varied. 90009 90002 90201 90009 90002 90009 90002 The auto is not the short form of Automatic; rather it is to notify the self or single coil. This coil forms a ratio which consists of two parts, primary and secondary. The position of the center tap node determines the primary and secondary ratio thus varying the output voltage. 90009 90002 90009 90002 The most common use is the V 90003 ARIAC 90004, an instrument to produce variable AC from a steady AC input.It is also used in Power transmission and distribution related applications where the high voltage lines are needed to be changed frequently. 90009 90002 90009 90012 90003 Types of Transformers based on Usage 90004 90015 90002 There are several types of transformers also available which works in a specific domain. Both electronics and electrical sectors, several dedicated transformers are used as a step-down or step-up transformer based on the application of application. So, the transformers can be classified as below based on usage: 90009 90002 1.Power Domain 90009 90223 90224 Power Transformer 90225 90224 Measurement Transformer 90225 90224 Distribution Transformer 90225 90230 90002 2. Electronics Domain 90009 90223 90224 Pulse Transformer 90225 90224 Audio Output Transformer 90225 90230 90002 90009 90012 90003 1. Transformers used in Power domain 90004 90015 90002 In Electrical, the Power domain deals with the power generation, measurement, and distribution. However, it is a very large field where transformers are an essential part to accommodate safe power conversion and successful power delivery to the substation and to the end users.90009 90002 The transformers which are used in the power domain can be both outdoor and indoor but mostly outdoor. 90009 90002 90009 90002 90003 (a) Power Transformer 90004 90009 90002 Power Transformers are larger in size and used to transfer the energy to the substation or the public electricity supply. This transformer acts as a bridge between the power generator and the primary distribution grid. Depending on the Power rating and specification, Power transformers can further be classified into three categories: 90003 Small power transformer, Medium Power transformers, and the Large power transformers 90004.The rating can be more than 30KVA to the 500-700KVA or in some cases that can be equal to or more than 7000KVA for small rated power transformer. The medium rated power transformer can be up to 50-100 MVA whereas large rated power transformers are capable to handle more than 100MVA. 90009 90002 90260 90009 90002 90009 90002 Due to very high power generation, the construction of a power transformer is also critical. 90003 The construction includes solid insulating peripherals and well balanced cooling system.90004 The most common power transformers are filled with oils. 90009 90002 The main principle of the 90003 power transformer is to convert the Low voltage high current to a high voltage low current 90004. This is required to minimize the power loss in the power distribution system. 90009 90002 Another important parameter for the Power transformer is the phase availability. 90003 Typically Power transformers works in three phase system 90004, but in some cases, Single phase small power transformers are also used.Three Phase Power transformers are the most costly and efficient than the single phase power transformers. 90009 90002 90009 90002 90003 (b) Measurement Transformer 90004 90009 90002 Measurement transformer is often referred to as an instrument transformer. This is another commonly used measurement instrument in the power domain. A measurement transformer is used to isolate the main power and convert the current and voltage in a smaller ratio to its secondary output. By measuring the output, the Phase, Current and Voltage of the actual power line can be measured.90009 90002 90285 90009 90002 90009 90002 The above image is showing the construction of the current transformer. 90009 90002 90009 90002 90003 (c) Distribution Transformer 90004 90009 90002 This is used in the last phase of the power distribution system. Distribution transformers are step down transformer, which converts High grid voltage to the end customer required voltage, 110V or 230V. It can also be single phase or three phases. 90009 90002 90300 90009 90002 90009 90002 Distribution transformers can be smaller in shape as well as bigger, depending on the conversion capacity or ratings.90009 90002 Distribution transformers can be further categorized into based on the type of insulation it uses. It can be a dry type or can be liquid-immersed. It is made using laminated steel plates mostly constructed in C shape as a core material. 90009 90002 Distribution transformer also has a different type of classification based on the location it is used. The transformer can be mounted on a utility pole, if so, it is called a pole mounted distribution transformers. It can be placed inside of an underground chamber, mounted on a concrete pad (pad mounted distribution transformer) or inside an enclosed steel box.90009 90002 Generally, distribution transformers have a rating of less than 200kVA. 90009 90002 90009 90012 90003 2. The transformer used in Electronics domain 90004 90015 90002 In electronics, various small miniature transformers are used which can be PCB mounted or can be fixed inside the small product enclosure. 90009 90002 90009 90002 90003 (a) Pulse Transformer 90004 90009 90002 Pulse transformers are one of most used PCB mounted transformers that produce electrical pulses in a constant amplitude.It is used in various digital circuits where pulse generation is needed in an isolated environment. Therefore, the pulse transformers isolate the primary and secondary and distribute primary pulses to the secondary circuit, often digital logic gates or drivers. 90009 90002 90329 90009 90002 90009 90002 Properly constructed pulse transformers should need proper galvanic isolation as well as small leakage and stray capacitance. 90009 90002 90009 90002 90003 (b) Audio Output Transformer 90004 90009 90002 Audio Transformer is another commonly used transformer in the electronics domain.It is specially used in Audio related application where impedance matching is required. Audio transformer balances the amplifier circuit and loads, typically a loudspeaker. The audio transformer can have multiple primary and secondary coils, separated or center tapped. 90009 90002 90344 90009 90002 90009 90002 So we have covered various kinds of transformer, other than that there are some other special purpose transformer but they are out of scope of this article. 90009 .90000 Purpose of Shielded Isolation Transformer 90001 90002 90002 Using shielded isolation transformer in power distribution systems 90004 Two-winding transformer 90005 90006 A shielded transformer is a 90007 90008 two-winding transformer 90009 90010, usually delta-star connected and serves the following purposes: 90011 90006 90008 1. 90009 — Voltage transformation from the distribution voltage to the equipment’s utilization voltage. 90011 90006 90008 2. 90009 — Converting a 3-wire input power to a 4-wire output thereby deriving a separate stable neutral for the power supply wiring going to sensitive equipment.90011 90006 90008 3. 90009 — Keeping third and its multiple harmonics away from sensitive equipment by allowing their free circulation in the delta winding. 90011 90006 90008 4. 90009 — Softening of high-frequency noise from the input side by the natural inductance of the transformer, particularly true for higher frequency of noise for which the reactance becomes more as the frequency increases. 90011 90006 90008 5. 90009 — Providing an 90007 90008 electrostatic shield 90009 90010 between the primary and the secondary windings thus avoiding transfer of surge / impulse voltages passing through inter-winding capacitance.90011 90036 90036 Figure 1 — Principle of a shielded two winding transformer 90006 90007 90008 Figure 1 90009 90010 shows the principle involved in a shielded transformer. The construction of the transformer is such that the magnetic core forms the innermost layer, followed by the secondary winding, the electrostatic shield made of a conducting material (90007 usually copper 90010) and finally the primary winding. 90011 90006 90007 90008 Figure 2 90009 90010 shows this detail. 90011 90006 It can be seen that the high-frequency surge is conducted to ground through the capacitance between the primary winding (on the left) and the shield, which is connected to ground.Besides the shield, the magnetic core, the neutral of the secondary winding and the grounding wire from the electronic equipment are all terminated to a ground bar, which in turn, is connected to the power supply ground / building ground. 90011 90054 90054 Figure 2 — Construction of a shielded two-winding transformer 90006 It is also important that the primary wiring to and secondary wiring from the isolation transformer are routed through separate trays / conduits. If this is not done, the inter-cable capacitances may come into play negating the very purpose of the transformer.90011 90006 90007 90008 Figure 3 90009 90010 shows the proper way for an isolation transformer to be wired. Note that the AC power supply wiring and the secondary wiring from the transformer are taken through separate conduits. 90011 90006 Also, the common ground connection of the isolation transformer serves as the reference ground for the sensitive loads. The AC system ground electrode connection is taken through a separate metal conduit. 90011 90066 90067 90067 Figure 3 — Wiring / earthing of a shielded two-winding transformer 90006 If these methods are not followed and wiring / earth connections are done incorrectly, noise problems may persist in spite of the isolation transformer.90011 90006 90007 90008 Resource: 90009 Practical-Grounding-Bonding-Shielding-and-Surge-Protection — G. Vijayaraghavan 90010 90011 .