CN215896135U - Three-phase isolation transformer with phase-shifting coil and power supply and distribution system - Google Patents

Abstract

The three-phase isolation transformer and power supply and distribution system comprises a primary winding, an iron core column and a secondary winding; the transformer is characterized in that the secondary winding comprises an auxiliary power supply winding and a direct current load winding, wherein a primary coil and a secondary coil which are mutually electrically isolated are installed on the same iron core column, the secondary coil comprises at least one alternating current load coil and a plurality of phase shifting coils which are mutually electrically isolated, the alternating current load coils are arranged on the inner sides of the phase shifting coils, the alternating current load coils on the three iron core columns form a three-phase auxiliary power supply winding for supplying power to an alternating current load loop, and the phase shifting coils on the three iron core columns form a three-phase direct current load winding for supplying power to the direct current load loop; by using 1 isolation transformer disclosed by the invention, two power supply circuits for supplying an alternating current load and a direct current load can be established, the occupied space of a high-voltage part is saved, and higher harmonics can be better filtered by using a direct current load winding consisting of a plurality of phase-shifting coils arranged on the secondary side.

Description

Three-phase isolation transformer with phase-shifting coil and power supply and distribution system

Technical Field

The present invention relates to an isolation transformer and a power supply and distribution system, and more particularly, to a three-phase isolation transformer having a phase-shift coil and a power supply and distribution system for a data center.

Background

With the development of the communication industry and the cloud computing industry, the data volume is continuously increased, the construction of a data center has great potential, and higher requirements are placed on the product performance and the economic cost of a transformer applied to the data center. The data center electric load is characterized by comprising an alternating current electric load, such as alternating current illumination, an air conditioner, office work and the like in a commercial power grade, and more direct current electric loads, such as a server host machine containing a UPS module and the like. The existing transformer for data center generally adopts a plurality of isolation transformers with three-phase alternating current output to respectively supply power for alternating current electric load and direct current electric load at the rear end.

For example, patent application No. 202011609352.9, entitled "an ac/DC power supply and system", discloses an ac/DC power supply, which includes an ac/DC conversion device having a first DC bus bar, a second DC bus bar for connecting a load, and a plurality of DC/DC converters, wherein input terminals of the plurality of DC/DC converters are connected in parallel to the first DC bus bar, and output terminals thereof are connected in parallel to the second DC bus bar; the alternating current-direct current power supply comprises a phase-shifting transformer with a plurality of groups of edge-extended triangular direct current load windings on a secondary side and the first direct current busbar, wherein an AC/DC converter is connected to each group of edge-extended triangular direct current load windings, and the output ends of all the AC/DC converters are connected in parallel and then connected to the first direct current busbar. For another example, the invention of application No. 202011522174.6 entitled "power supply system and data center" also provides a substantially similar power supply arrangement.

The above prior art discloses a technical solution of dragging a DC load (AC/DC converter) at the back end by using a phase-shifting transformer, so that it can be known that an AC load in a data center must be dragged by using another AC transformer. For example, patent application No. 201910833569.9 entitled "power supply system, power supply method, and data center" includes a first power supply circuit having an input terminal for connection to a power supply source and an output terminal for connection to a load; the power supply system comprises a second power supply circuit, wherein the second power supply circuit comprises a voltage transformation circuit and a rectification circuit, the input end of the voltage transformation circuit is used for being connected with power supply energy, the input end of the rectification circuit is connected with the output end of the voltage transformation circuit, and the output end of the rectification circuit is used for being connected with a load. The transformer circuit comprises a transformer, and the transformer is connected between the input end of the rectifying circuit and a power supply energy source; the difference value between the trigger angles of the rectifier modules of the different rectifier module groups is Y ═ D/M, wherein D is the phase shift angle of the transformer, and M is the number of the rectifier module groups. The load in the scheme is a hybrid power utilization module comprising an alternating current load and a direct current load, and at least two power supply lines are adopted for supplying power in parallel from a commercial power end to a terminal load end, a first power supply circuit supplies power for the alternating current load from the commercial power end to the load end, and a second power supply circuit supplies power for the direct current load from the commercial power end to the load end. The major problems that result from this include: 1, a plurality of isolation transformers are needed to establish a plurality of mutually isolated power supply circuits from a commercial power end to a terminal load end, the circuits are complex, and the construction cost is high; 2. in consideration of electrical safety isolation, the power supply circuits which are isolated from each other must be electrically isolated from each other at a large distance, so that the occupied area is large, the comprehensive construction cost is further increased, and the potential failure rate is high; and 3, the transformer has low efficiency and high energy consumption. These problems are clearly worth thinking and there is room for further improvement and refinement.

SUMMARY OF THE PATENT FOR INVENTION

In order to solve at least one of the problems mentioned in the background art, or to optimize and improve the energy efficiency of the existing design, the present invention firstly proposes a new three-phase isolation transformer product containing a phase-shifting coil, comprising a primary winding, a core limb and a secondary winding; the three-phase alternating current phase shifting coil is characterized in that the secondary winding comprises an auxiliary power supply winding and a direct current load winding, wherein a primary coil and a secondary coil which are electrically isolated from each other are installed on the same iron core column, the secondary coil comprises at least one alternating current load coil and a plurality of phase shifting coils which are electrically isolated from each other, the alternating current load coils are arranged on the inner side of the phase shifting coils, the three-phase auxiliary power supply winding is formed by the alternating current load coils on the three iron core columns and used for supplying power to an alternating current load loop, and the three-phase direct current load winding is formed by the phase shifting coils on the three iron core columns and used for supplying power to the direct current load loop.

The primary winding comprises a primary coil, the secondary winding comprises a secondary coil, the primary coil and the secondary coil are arranged on the same iron core column and can be separated, the alternating current load coil can be arranged on the inner side of the primary coil, the phase shifting coils are arranged on the outer side of the primary coil, and the three types of electric coils are electrically isolated from each other.

The alternating current load coil directly provides alternating current power output for commercial power alternating current loads of a terminal, such as alternating current lighting equipment, an air conditioner and the like, and the three-phase alternating current load coil can form a three-phase auxiliary power supply winding in a Y or delta connection mode and directly outputs alternating current power to supply power to an alternating current load loop; the phase shifting coil outputs alternating current power to supply power to a direct current load loop, and the direct current load loop comprises alternating current to direct current rectifying devices such as an AC/DC rectifying module and a direct current busbar which are arranged in the loop and provide direct current power for direct current loads of terminals such as servers for information centers and the like.

More than one set (for example, 1, 2 or 3 sets) of auxiliary power supply windings can be arranged on the three core legs, and three auxiliary power supply coils respectively located on the three core legs are connected to form a set of auxiliary power supply output windings, where the auxiliary power supply output refers to an output end for supplying electric energy to an alternating current load.

The number of the phase shifting coils arranged on each core limb can be determined according to the comprehensive design of factors such as the size of the load and the capacity of the rectifier module, for example, 3 to 20 phase shifting coils or more can be arranged on each core limb, all the phase shifting coils on the three core limbs correspondingly form 3 to 20 groups or more of direct current load windings, the three phase shifting coils respectively positioned on the three core limbs form a group of direct current load output, the output phase shifting angles of different direct current load windings distributed in the phase shifting range (generally, between-30 degrees and +30 degrees) are different, and the direct current load output refers to an output end for providing electric energy for the direct current load. The different direct current load windings have phase shift angle difference, and generally speaking, the difference between the trigger angles of the rectifier modules connected to the direct current load windings with different phase shift angles is adapted to the phase shift angle of the direct current load windings.

In another application, the above-mentioned 3 to 20 groups of dc load windings (one subgroup) can be arranged again, i.e. two or even three subgroups of dc load windings are arranged. For these dc load windings with a relatively large number, on the basis of arranging several coils in the axial direction, they may be arranged radially outside the primary coils in a stacked manner.

Furthermore, the invention provides a power supply and distribution system, which comprises the isolation transformer with any structure, a high-voltage power distribution cabinet arranged on the input side of the isolation transformer, an auxiliary power supply cabinet arranged on the output side of the isolation transformer and a direct-current load power distribution cabinet, wherein the wire outlet end of the high-voltage power distribution cabinet is electrically connected with a three-phase primary winding of the isolation transformer, the auxiliary power supply winding of the isolation transformer is electrically connected with the wire inlet end of the auxiliary power supply cabinet, and the direct-current load winding of the isolation transformer is electrically connected with the wire inlet end of the direct-current load power distribution cabinet.

According to the technical scheme, the beneficial technical effects can be found that firstly, two power supply circuits for supplying an alternating current load and a direct current load can be established by utilizing 1 isolation transformer disclosed by the invention, so that at least the floor space of a high-voltage part is saved, and the wiring length of a high-voltage and low-voltage connecting cable is shortened; for the data center load of one unit, the work which can be finished by at least two traditional transformers can be finished by one transformer; secondly, the control electric cabinet on the outgoing line side of the transformer is conveniently and neatly arranged; thirdly, by utilizing the direct current load winding formed by the plurality of phase shifting coils arranged on the secondary side, higher harmonics in the secondary winding can be better filtered, harmonic interference on the user side is greatly reduced, and the operation safety of the server on the load side can also be improved.

The further technical scheme can also be that the voltage grade of the three-phase primary winding is 10KV for being directly connected to a 10KV high-voltage line, the voltage grade of the auxiliary power supply winding is 400V for outputting 400V commercial power, and the output voltage of the direct-current load winding is adapted to the rectification module. Therefore, the transformer can directly convert high-voltage electricity into low-voltage electricity, and efficiency is improved. Based on the power supply and distribution system applying the isolation transformer with the voltage grade of 10KV, high-voltage electricity with the voltage grade of 10KV can be directly transformed and distributed into a power distribution system with commercial power or even lower voltage.

The further technical scheme can also be that temperature probes are respectively arranged in the primary winding and the secondary winding and used for detecting and outputting temperature signals of the coils. The temperature probe can be in signal connection with a central controller mentioned later, and the central controller can automatically control whether an incoming line switch and an outgoing line switch of the isolation transformer are opened or closed according to the temperature signal of the coil detected and provided by the temperature probe, and can further implement alarming.

The technical scheme further includes that an AC/DC rectifier module and a DC bus bar are arranged in the DC load power distribution cabinet, the rectifier module is configured to rectify an AC signal provided by a phase shifting coil of the DC load winding into a DC signal and output the DC signal to the DC bus bar, and the DC bus bar is configured to provide a DC power supply to a DC load. The further technical scheme can also be that the output end of each phase shifting coil is connected with at least one AC/DC rectifying module. The AC/DC rectifying module is also a rectifier for converting alternating current into direct current, and is operated under the control of the controller to output one voltage of direct current voltage electric energy of 240V, 64V, 48V, 36V or 12V. An isolating switch can be arranged between the direct current busbars in different direct current load power distribution cabinets, the direct current busbars are also called bus bars, and direct current loads of terminals are connected to the direct current busbars.

The further technical scheme can also be that the direct-current bus bar further comprises an energy storage device, and the energy storage device is connected to the direct-current bus bar through an energy storage controller. The energy storage device also becomes a storage battery pack, and the energy storage controller is used for charging the storage battery pack or reversely releasing direct current electric energy to the bus bar.

The technical scheme is that the power distribution system further comprises a central control cabinet arranged on the side edge of the auxiliary power supply cabinet or the direct-current load power distribution cabinet, wherein a central controller is arranged in the central control cabinet, and the central controller is in signal connection with control switches arranged in the high-voltage power distribution cabinet, the auxiliary power supply cabinet or/and the direct-current load power distribution cabinet.

The invention has the advantages of the characteristics and simple structure, and can be applied to a power supply and distribution system requiring alternating current loads and direct current loads.

Drawings

FIG. 1 is a schematic diagram of an electrical configuration of a power supply and distribution system to which the present invention is applied;

FIG. 2 is a schematic diagram of a power supply and distribution system layout structure to which the present invention is applied;

fig. 3 is a schematic perspective view of a three-phase isolation transformer 100 to which the present invention is applied;

fig. 4 is a schematic diagram of a winding phase layout of a three-phase isolation transformer 100 to which the present invention is applied.

Detailed Description

The following describes a specific implementation structure of a three-phase isolation transformer and a power supply and distribution system including a phase-shifting coil, which implement the technical scheme of the present disclosure, with reference to the accompanying drawings. As shown in fig. 1 and 2, a power supply and distribution system includes a three-phase isolation transformer 100, a high-voltage distribution cabinet 101 disposed on an input side of the isolation transformer 100, an auxiliary power supply cabinet 102 disposed on an output side of the isolation transformer 100, and a dc load distribution cabinet 103. Isolation transformer 100 also can be integrated in an independent switch board, high voltage distribution cabinet 101, isolation transformer 100, auxiliary power cabinet 102 and direct current load switch board 103 arrange in proper order in a unit room, wherein isolation transformer 100, high voltage distribution cabinet 101's voltage class is 10KV, and outdoor 10KV three-phase five-wire high voltage cable is refuted and is connect to on high voltage distribution cabinet 101's the input terminal, at least, dispose high voltage isolator in the high voltage distribution cabinet 101 and even can also install overload protection switch, high voltage distribution cabinet 101 output terminal through high voltage cable reconnection on isolation transformer 100's the binding post of three-phase primary winding.

As shown in fig. 3 and 4, the isolation transformer 100 is an isolation type transformer of three phases, and includes three core legs 1, and a primary winding of three phases and a secondary winding of three phases are arranged on the three core legs 1.

The voltage grade of the three-phase primary winding is 10KV, each phase comprises a primary coil 2, and the three primary coils 2 which are respectively arranged on the three iron core columns 1 are connected to form a group of three-phase primary winding which is also a high-voltage input winding of the transformer.

The secondary winding includes an auxiliary power supply winding and a dc load winding. Wherein a primary coil 2 and a secondary coil electrically isolated from each other are mounted on the same core limb 1. The secondary coil comprises an alternating current load coil 31 and a plurality of phase shifting coils 32 which are mutually electrically isolated, the alternating current load coil 31 is arranged on the inner side of the phase shifting coils 32, three alternating current load coils 31 respectively arranged on the three iron core columns 1 form a group of three-phase auxiliary power supply windings to supply power to an alternating current load circuit, and three phase shifting coils 32 respectively arranged on the three iron core columns 1 form a group of three-phase direct current load windings to supply power to a direct current load circuit. Therefore, the transformer can directly convert high-voltage electricity into at least two power supply loops, and efficiency is improved.

The three-phase ac load coil 31 may form the auxiliary power supply winding by Y or delta connection, the voltage level of the auxiliary power supply winding is 400V for outputting ac 400V mains supply, the output end of the auxiliary power supply winding is connected to a corresponding connection terminal arranged on a side connection bar through a lead, and then is connected to the input end of the auxiliary power supply cabinet 102 through a wire, the auxiliary power supply cabinet 102 is configured with a control switch and may even be installed with an overload protection switch, and the output end of the control switch of the auxiliary power supply cabinet 102 is connected to an ac load loop and directly provides ac power output for a mains supply ac load at the terminal of the ac load loop, such as an ac lighting device, an air conditioner, and the like. The auxiliary power supply winding is at least one group, and in other further improvement schemes, the auxiliary power supply winding can also be 2 groups, 3 groups and the like.

The phase shifting coils 32 output AC power, but indirectly provide power output for a DC load of a terminal, such as a server for an information center, through an AC/DC rectifier device (AC/DC) such as the rectifier module 4 and the DC bus bar 5, and an output end of each phase shifting coil 32 is connected to at least one AC/DC rectifier module 4. The output voltage of the direct current load winding is adapted to the working voltage level of the rectifier module 4, and the output voltage of the rectifier module 4 is adapted to the working voltage level of the direct current busbar 5. When specific circuit arrangement, let direct current load winding's output pass through the binding post 33 and the electrical lead reconnection of side direct current load switch board 103's input, rectifier module 4 and the female row 5 of direct current are arranged in direct current load switch board 103, can set up isolator between the female row of direct current among the different direct current load switch boards 103, rectifier module 4's input is through control switch electricity can also install overload protection switch and connect even direct current load switch board 103's input, rectifier module 4's output passes through control switch electricity and connects the female row 5 of direct current. The voltage level of the DC busbar 5 may be one of DC336V, 240V, 110V, 64V, 48V and even 12V, and is used for providing DC power to DC loads such as servers for information centers. The output end of the dc bus bar 5 may also be connected to different individual load devices, such as a server host, through separate switches.

In a specific embodiment, as shown in fig. 3, the primary coil 2 and the secondary coil are arranged on the same section of the same core magnetic circuit and the ac load coil 31 is arranged on the inner side of the primary coil 2, a plurality of phase shifting coils 32 are arranged on the outer side of the primary coil 2, three types of electric coils are overlapped and connected together but electrically isolated from each other, in this embodiment, the primary coil 2 and the inner ac load coil 31, and the primary coil 2 and the outer plurality of phase shifting coils 32 have great disparity due to voltage grade differences, and therefore, the primary coil 2 and the outer plurality of phase shifting coils must be insulated and isolated from each other. In another equivalent embodiment, the primary coil 2 and the secondary coil may be separated from each other and located at different magnetic path sections, although they are arranged on the same core magnetic path.

The number of the phase shift coils 32 arranged on each core limb 1 may be determined by comprehensive design according to the size of the load itself and the capacity of the rectifier module 4, for example, as shown in fig. 4, 3 phases × 15 phase shift coils 32 are arranged to form 15 groups of 45 (90 pulses) outputs, 15 groups of dc load windings have approximately uniformly distributed phase shift angle differences in a phase angle range between-30 ° and +30 °, and generally, the difference between the trigger angles of the rectifier modules 4 connected to the dc load windings with different phase shift angles is adapted to the phase shift angle of the dc load winding. As shown in fig. 4, 15 groups of dc load windings (45 coils) are used as a small group, and a total of 90 coils are provided for the two small groups of dc load windings. The phase shift angles arranged in a small group constructed by 15 groups of direct current load windings are respectively as follows: 0 degree, -4.3 degree, +4.3 degree, -8.6 degree, +8.6 degree, -12.9 degree, +12.9 degree, -17.1 degree, +17.1 degree, -21.4 degree, +21.4 degree, -25.7 degree, +25.7 degree, -30 degree, +30 degree. The phase shift angle difference between each winding is substantially 4.3 ° (60 divided by 14 ≈ 4.3), and the odd harmonics can be effectively eliminated by the structure in which these phase shift angles are symmetrically distributed.

Further, an energy storage device (not shown in the figure) is further disposed on a side of the dc load distribution cabinet 103, the energy storage device is a storage battery pack, and the storage battery pack is connected to the dc busbar 5 through an energy storage controller. The energy storage controller is in signal connection with the central controller and is used for bidirectional work, and the energy storage controller can charge the storage battery pack and can release electric energy to the direct-current busbar 5.

Furthermore, a temperature probe (not shown in the figure), for example, PT100 type temperature probe, is respectively arranged in the primary winding and the secondary winding, a special central control cabinet 104 is further arranged on the side of the dc load distribution cabinet 103, a central controller is arranged in the central control cabinet 104, and the temperature probe is in signal connection with the central controller; and then, all the control switches in the high-voltage power distribution cabinet 101, the auxiliary power supply cabinet 102 and the direct-current load power distribution cabinet 103 are in signal connection with the central controller, so that the central controller can be used for not only controlling the control switches in the high-voltage power distribution cabinet 101, the auxiliary power supply cabinet 102 and the direct-current load power distribution cabinet 103 in a correlation manner, but also responding to a transformer temperature signal provided by the temperature probe to alarm or control a high-voltage switch at a primary side or a low-voltage switch at a low-voltage side. Secondly, a remote communication unit can be arranged in the central control cabinet 104, and the central controller can interact various signals such as various voltages, currents, power consumption, temperatures and the like with a remote control or monitoring center through the remote communication unit.

The transformer and the power supply and distribution system applied by the transformer in the embodiment of the disclosure not only can directly convert high voltage into low voltage, thereby simplifying the structure of a high-voltage power supply loop, but also further simplifies the structure of the power supply loop and the configuration of a power transformation link because the isolation transformer has two output loops with load properties, thereby simplifying the structure of the whole power supply and distribution system and reducing the comprehensive construction cost.

Claims (9)

1. The three-phase isolation transformer comprises a primary winding, an iron core column and a secondary winding; the three-phase alternating current phase shifting coil is characterized in that the secondary winding comprises an auxiliary power supply winding and a direct current load winding, wherein a primary coil and a secondary coil which are electrically isolated from each other are installed on the same iron core column, the secondary coil comprises at least one alternating current load coil and a plurality of phase shifting coils which are electrically isolated from each other, the alternating current load coils are arranged on the inner side of the phase shifting coils, the three-phase auxiliary power supply winding is formed by the alternating current load coils on the three iron core columns and used for supplying power to an alternating current load loop, and the three-phase direct current load winding is formed by the phase shifting coils on the three iron core columns and used for supplying power to the direct current load loop.

2. The three-phase isolation transformer with phase-shifting coils of claim 1, wherein the ac load coil is disposed inside the primary coil and the phase-shifting coils are disposed outside the primary coil on the same core leg.

3. The three-phase isolation transformer with the phase-shifting coil as claimed in claim 1, wherein the voltage level of the primary winding of the three phases is 10KV for direct connection to a 10KV high-voltage line, the voltage level of the auxiliary power supply winding is 400V for outputting 400V commercial power, and the output voltage of the dc load winding is adapted to the rectifier module.

4. The three-phase isolation transformer with the phase-shifting coil as claimed in claim 1, wherein a temperature probe is disposed in each of the primary winding and the secondary winding for detecting and outputting a temperature signal of the coil.

5. A power supply and distribution system comprises the isolation transformer of any one of claims 1 to 4, a high-voltage power distribution cabinet arranged on the input side of the isolation transformer, an auxiliary power supply cabinet arranged on the output side of the isolation transformer and a direct-current load power distribution cabinet, wherein the outlet end of the high-voltage power distribution cabinet is electrically connected with the three-phase primary winding of the isolation transformer, the auxiliary power supply winding of the isolation transformer is electrically connected with the inlet end of the auxiliary power supply cabinet, and the direct-current load winding of the isolation transformer is electrically connected with the inlet end of the direct-current load power distribution cabinet.

6. The power supply and distribution system according to claim 5, wherein an AC/DC rectifier module and a DC busbar are arranged in the DC load power distribution cabinet, the rectifier module is configured to rectify an AC signal provided by a phase shifting coil of the DC load winding into a DC signal and output the DC signal to the DC busbar, and the DC busbar is configured to provide a DC power supply to a DC load.

7. The power supply and distribution system of claim 6 wherein the output of each phase shifting coil is connected to at least one AC/DC rectifier module.

8. The power supply and distribution system according to claim 6, further comprising an energy storage device connected to the dc bus bar through an energy storage controller.

9. The power supply and distribution system according to claim 5, further comprising a central control cabinet disposed at a side of the auxiliary power supply cabinet or the DC load distribution cabinet, wherein a central controller is disposed in the central control cabinet, and the central controller is in signal connection with control switches disposed in the high voltage power distribution cabinet, the auxiliary power supply cabinet or/and the DC load distribution cabinet.

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