CN212676081U

CN212676081U - On-load voltage regulation assembly for transformer and transformer

Info

Publication number: CN212676081U
Application number: CN202021262946.2U
Authority: CN
Inventors: 田国硬; 扈亮; 贾小光
Original assignee: Kebo Electrical Equipment Co ltd
Current assignee: Kebo Electrical Equipment Co ltd
Priority date: 2020-06-20
Filing date: 2020-06-20
Publication date: 2021-03-09
Anticipated expiration: 2030-06-20

Abstract

The utility model discloses an on-load voltage regulation subassembly and transformer for transformer, wherein, this on-load voltage regulation subassembly includes: the voltage regulating circuit comprises a plurality of voltage regulating switches, a plurality of voltage regulating switches and a control circuit, wherein each switch in the plurality of voltage regulating switches is used for regulating the output voltage of a transformer to a voltage value, and the voltage values regulated by any two switches in the plurality of voltage regulating switches are different; and the controller is electrically connected with the voltage regulating switches and is used for controlling the on-off of the voltage regulating switches according to the operation of a user or the working state of the transformer. The technical problem of high cost of a three-phase oil-immersed on-load voltage regulation distribution transformer in the prior art is solved.

Description

On-load voltage regulation assembly for transformer and transformer

Technical Field

The utility model relates to a three-phase oil-immersed on-load voltage regulation distribution transformer field particularly, relates to an on-load voltage regulation subassembly and transformer for transformer.

Background

With the continuous improvement and improvement of the living standard of residents in China, the requirements of people on the power supply quality are higher and higher. The 10kV power distribution network has large voltage fluctuation caused by complex power grid, long line and large load change, and the distribution transformer must realize on-load voltage regulation for meeting the power supply quality requirement. However, the conventional on-load tap changing distribution transformer cannot be adjusted according to the voltage, or the on-load tap changing distribution transformer with a plurality of voltage levels is adopted for processing, so that the cost is high.

Aiming at the problem of a three-phase oil-immersed on-load voltage regulation distribution transformer in the prior art, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an on-load voltage regulation subassembly and transformer for transformer to the higher technical problem of cost of three-phase oil-immersed on-load voltage regulation distribution transformer among the prior art has been solved at least.

According to the utility model discloses an aspect of the embodiment provides an on-load voltage regulation subassembly for transformer, include: the voltage regulating circuit comprises a plurality of voltage regulating switches, a plurality of voltage regulating switches and a control circuit, wherein each switch in the plurality of voltage regulating switches is used for regulating the output voltage of a transformer to a voltage value, and the voltage values regulated by any two switches in the plurality of voltage regulating switches are different; and the controller is electrically connected with the voltage regulating switches and is used for controlling the on-off of the voltage regulating switches according to the operation of a user or the working state of the transformer.

Optionally, the on-load tap changer further includes: the first memory is electrically connected with the controller and used for storing the real-time operation data and the historical operation data of the transformer, which are acquired by the controller; the second memory is electrically connected with the controller and used for storing the adjustment records of the controller on the plurality of voltage regulating switches; the third memory is electrically connected with the controller and used for storing voltage regulation transient data, and the voltage regulation transient data comprises a current value at a voltage regulation moment, a current value of a three-phase current at an integral point moment every day, a voltage value of a three-phase voltage, a power value of active power, a power value of reactive power, a power factor, a position state of a voltage regulation switch, locking information, alarm information, restart information, manual control information, automatic control information and remote control state switching records; the first communication module is connected with the controller and is used for communicating with an upper computer or other transformers; the second communication module is connected with the controller and is used for transmitting the received control instruction to the controller; and the monitoring module is connected with the controller and is used for monitoring the voltage value of the three-phase voltage output by the voltage regulating side, the current value of the three-phase current, the power value of the three-phase active power, the power value of the three-phase reactive power and the power factor.

Adopt the utility model discloses an on-load voltage regulation distribution transformer is immersed to three-phase oil, because the voltage regulating value that carries out on-load voltage regulation can adjust according to actual need, and need not purchase many three-phase oil-immersed on-load voltage regulation distribution transformer, has solved the higher technical problem of cost of three-phase oil-immersed on-load voltage regulation distribution transformer among the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic diagram of an on-load tap changing assembly for a transformer according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of circuits or devices is not necessarily limited to those circuits or devices expressly listed, but may include other circuits or devices not expressly listed or inherent to such article or apparatus.

Fig. 1 is a schematic diagram of an on-load tap changing assembly for a transformer according to an embodiment of the present invention, as shown in fig. 1, the on-load tap changing assembly for a transformer includes:

a plurality of voltage regulating switches 11, each of which is used for regulating the output voltage of the transformer to a voltage value, wherein the voltage values regulated by any two switches in the plurality of voltage regulating switches are different;

and the controller 13 is electrically connected with the plurality of voltage regulating switches and is used for controlling the plurality of voltage regulating switches to be opened and closed according to user operation or the working state of the transformer.

Optionally, the on-load tap changer further includes: the first memory is electrically connected with the controller and used for storing the real-time operation data and the historical operation data of the transformer, which are acquired by the controller; the second memory is electrically connected with the controller and used for storing the adjustment records of the controller on the plurality of voltage regulating switches: the third memory is electrically connected with the controller and used for storing voltage regulation transient data, and the voltage regulation transient data comprises a current value at a voltage regulation moment, a current value of a three-phase current at an integral point moment every day, a voltage value of a three-phase voltage, a power value of active power, a power value of reactive power, a power factor, a position state of a voltage regulation switch, locking information, alarm information, restart information, manual control information, automatic control information and remote control state switching records; the first communication module is connected with the controller and is used for communicating with an upper computer or other transformers; the second communication module is connected with the controller and is used for transmitting the received control instruction to the controller; and the monitoring module is connected with the controller and is used for monitoring the voltage value of the three-phase voltage output by the voltage regulating side, the current value of the three-phase current, the power value of the three-phase active power, the power value of the three-phase reactive power and the power factor.

Adopt the utility model discloses an oily formula on-load voltage regulation distribution transformer of three-phase owing to adopted the design of integration, can directly install corresponding module in the box when the installation, bad when falling of module directly the more new module can, solved among the prior art three-phase oily formula on-load voltage regulation distribution transformer's the higher technical problem of cost.

The voltage regulating switch of the on-load voltage regulating transformer automatically changes the voltage regulating tapping gear step by step according to the voltage change, thereby realizing the switching of the actual operation voltage of the transformer. The switching process should keep the power supply continuity of the low-voltage side, the duration of the operation overvoltage generated on the low-voltage side should be less than 10ms, and the safe and stable operation of the electrical equipment on the low-voltage side should not be influenced. The oil tank of the on-load voltage regulating transformer adopts a full-sealing structure, and can be a corrugated oil tank, an oil tank with an elastic finned radiator or an oil tank filled with gas.

The on-load tap changer should be fitted with a pressure relief valve that should reliably release pressure when the pressure in the tank reaches a safe limit, but should not have transformer oil overflow. The on-load pressure regulation should ensure that the pressure relief valve does not act under the conditions of the highest environmental temperature and the maximum allowable load; the oil level of the transformer should be reliable to ensure insulation of each part when the transformer is not put into operation at the lowest ambient temperature. The on-load voltage regulation should be equipped with a transformer oil level display device, and the oil level indication should be reliably observed when the maximum ambient temperature and the maximum allowable load state, and when the minimum ambient temperature and the transformer are not put into operation.

Oil temperature measuring device: the on-load tap changer is preferably provided with a tube seat for a thermometer, and the tube seat is required to extend into the transformer oil by 120mm +/-10 mm. Tolerance under short circuit: the loaded voltage regulating transformer can bear the maximum short-circuit thermal stability current for 0.5s at any tap, each part has no damage and obvious deformation, and the average temperature of the short-circuited winding is not more than 250 ℃ at most. Overload capacity: the overload capability of any accessory device should not be less than the overload capability of the on-load tap changer. The operation is allowed for 120min when the load is 50% under the conditions that the initial load is 80% and the ambient temperature is 40 ℃. The hottest point temperature of the on-load tap changer does not exceed 140 ℃, and the oil temperature of the top layer of the on-load tap changer does not exceed 55 ℃.

A pure porcelain sleeve is adopted on the 10kV side, a brown porcelain sleeve is adopted as the sleeve, the creep distance is not less than 372mm, and the good anti-pollution capability and the good running performance are realized. The on-load voltage regulating transformer core and the larger metal component are both reliably grounded through the oil tank. The iron core is a silicon steel sheet (including a rolled iron core type and a stacked iron core type). All coil materials adopt copper wires or copper foils, and if the enameled copper wires are adopted, the QQ2 acetal enameled copper wires are adopted. All the leads and the conductive plates should be bound by insulation. The iron core material is high-quality cold rolled silicon steel sheet, and the laminated iron core type iron core adopts a fully-inclined seam, non-porous binding and channel steel type clamping piece structure.

The on-load tap changer has the function of adjusting tap gears of voltage regulation, and the asynchronism of three phases is less than or equal to 4 ms. The switching process of the on-load voltage regulating switch is finished within 20-40 ms, and the continuity of power supply at the low-voltage side is kept. The rated capacity of the on-load tap changer is not lower than the maximum capacity of the transformer. The electrical service life of the on-load tap changer is not less than 50000 times, and at least a type test report of not less than 25000 times is provided. The working power supply of the on-load tap changer is AC 220V/380V, and the allowable deviation is as follows: 20% + 20%, the operation power supply side should be equipped with the switching current limiting device. The pressure regulating switch should be provided with a pressure release channel. Vacuum arc extinguishing is adopted for the on-load voltage regulating switch, the arc light in the switching process cannot influence the oil quality, and the on-load voltage regulating switch is preferably a permanent magnet mechanism switch.

The basic functions of the controller comprise two control modes of manual and automatic voltage regulation, the operating load and voltage working conditions of the transformer can be automatically detected under the load or excitation condition, automatic judgment is carried out according to preset conditions, corresponding instructions are sent out, the action of the on-load voltage regulation switch is accurately controlled, and the automatic adjustment of the tapping gear of the transformer and the control of transmitting various real-time and historical operating data and information of the transformer are realized. The intelligent monitoring system has the functions of monitoring the voltage-regulating variable operation parameters and the switch position, and has the functions of voltage-regulating control, threshold parameter setting, recording operation data and events (including switch switching times), indicating the operation state, carrying out local communication, sending out a locking alarm signal and the like.

And (4) standard type. The standard controller is additionally provided with a short-distance wireless communication module on the basis of the basic functions of the controller, has a short-distance wireless communication function, and can be connected with the controller through a PC (personal computer) or other terminals to realize data transmission, setting and control. And (4) intelligent type. The intelligent controller expands an external GPRS or Ethernet communication module on the basis of a standard type, and has the functions of remote communication and mutual communication with an intelligent power distribution terminal.

And (5) monitoring function. The controller has real-time data acquisition and processing functions, including monitoring three-phase voltage, three-phase current, three-phase active power, three-phase reactive power, power factor and the like at the low-voltage side of the on-load voltage regulation; the on-load tap changer gear and the switch switching state are monitored in real time; the collected information content conforms to the specification of DL/T698.1.

And (4) a voltage regulation control function. The controller should have two voltage regulation modes of manual control and automatic control, and be locked mutually. Data and event logging functions are run. The voltage regulating times and the running accumulated time are recorded, and the accumulated running time of different voltage regulating tapping gears is recorded; the voltage regulation transient data comprises: the method comprises the steps of voltage regulation, active power, reactive power, power factor, voltage regulation switch position state, locking information, device alarm information, device restarting information, manual control, automatic control, remote control state switching record and the like.

And (5) a parameter setting function. The function of threshold setting and action time setting of pressure regulating action is provided, and the threshold setting control range is +/-5%; should have TA transformation ratio, communication parameter and communication address setting function, TA can be shared with other TA measurement; the system has the functions of clock setting, voltage regulation frequency clearing, accumulated time clearing and factory setting restoration.

A run status indication function. The controller has the function of indicating the states of various control modes, alarms, locking, operation and the like of the controller. A communication function. The handheld terminal is provided with a USB interface, an RS232 interface and a short-distance wireless communication interface, and can realize a communication function through a USB data line or a short-distance wireless handheld terminal PDA. A lockout alarm function. When the controller has a fault inside, the output loop is locked and the warning lamp is lightened; and (5) locking the output loop after the number of times of pressure regulation is set per day. Data download and program upgrade functions. The functions of data downloading and program upgrading tasks can be realized.

The device is usually independently installed in a control box of a voltage regulating transformer, and is also suitable for installation in closed/semi-closed spaces such as an outdoor distribution box, an indoor distribution box, a low-voltage chamber of a box-type substation and the like; a closed shell is adopted, and the protective performance meets the IP 51-grade requirement specified in GB 4208, namely dust prevention and drip prevention; the panel of the controller is provided with an indicator light for displaying the operating gear of the voltage-regulating tap switch, an automatic and manual voltage-regulating control mode, a locking indication, an alarm indication, an operating indication and the like; the output interface has at least 1 RS232 interface and 1 USB interface. A communication protocol. The communication protocols of the controller, the remote master station and the PDA are required to meet the communication requirements of related equipment.

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The utility model discloses each subassembly that will protect all is the entity product that has definite shape, structure and occupy certain space, all be computer equipment, terminal or server that can independent operation, have specific hardware structure like high-pressure measurement subassembly etc..

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An on-load tap changing assembly for a transformer, comprising:

the voltage regulating circuit comprises a plurality of voltage regulating switches, a plurality of voltage regulating switches and a control circuit, wherein each switch in the plurality of voltage regulating switches is used for regulating the output voltage of a transformer to a voltage value, and the voltage values regulated by any two switches in the plurality of voltage regulating switches are different;

and the controller is electrically connected with the voltage regulating switches and is used for controlling the on-off of the voltage regulating switches according to the operation of a user or the working state of the transformer.

2. The on-load tap changing assembly of claim 1, further comprising:

the first memory is electrically connected with the controller and used for storing the real-time operation data and the historical operation data of the transformer, which are acquired by the controller;

the second memory is electrically connected with the controller and used for storing the adjustment records of the controller on the plurality of voltage regulating switches;

the third memory is electrically connected with the controller and used for storing voltage regulation transient data, and the voltage regulation transient data comprises a current value at a voltage regulation moment, a current value of a three-phase current at an integral point moment every day, a voltage value of a three-phase voltage, a power value of active power, a power value of reactive power, a power factor, a position state of a voltage regulation switch, locking information, alarm information, restart information, manual control information, automatic control information and remote control state switching records;

the first communication module is connected with the controller and is used for communicating with an upper computer or other transformers;

the second communication module is connected with the controller and is used for transmitting the received control instruction to the controller;

and the monitoring module is connected with the controller and is used for monitoring the voltage value of the three-phase voltage output by the voltage regulating side, the current value of the three-phase current, the power value of the three-phase active power, the power value of the three-phase reactive power and the power factor.

3. A three-phase oil-immersed on-load tap changing distribution transformer comprising an on-load tap changing assembly for a transformer according to claim 1 or 2.