CN210572460U - Combined electronic transformer for distribution transformer - Google Patents
Combined electronic transformer for distribution transformer Download PDFInfo
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- CN210572460U CN210572460U CN201921453281.0U CN201921453281U CN210572460U CN 210572460 U CN210572460 U CN 210572460U CN 201921453281 U CN201921453281 U CN 201921453281U CN 210572460 U CN210572460 U CN 210572460U
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Abstract
A combined electronic transformer for a distribution transformer belongs to the field of electrical engineering measurement. The method is characterized in that: the transformer comprises a shell (4), wherein a conducting rod (7) which penetrates through the shell in the axial direction is arranged at the axis of the shell (4), and the conducting rod (7) is positioned at the top of the transformer (2) and is used for connecting alternating current into the transformer (2); a sensor is arranged in the shell (4), a data interface is arranged at the lower part of the shell (4), and data output by the sensor is led out through the data interface. Through this a combination electronic transformer for distribution transformer, can directly replace the vase insulator at transformer top and carry out alternating current power supply's transmission, built-in sensor has realized carrying out perception and measurement to the parameter of transformer simultaneously to the sensing function that has possessed the requirement of electric power thing networking simultaneously.
Description
Technical Field
A combined electronic transformer for a distribution transformer belongs to the field of electrical engineering measurement.
Background
In recent years, a national grid company provides deployment arrangement for comprehensively constructing a ubiquitous power internet of things, and according to the top-level design of the national grid company, the ubiquitous power internet of things comprises a four-layer structure including a sensing layer, a network layer, a platform layer and an application layer. The transformer is used as an important device of a modern power network and plays a key role in each link of power generation, power transmission and transformation and power distribution.
Among various voltage class transformers, the distribution transformer directly faces to electricity consumers, and along with the continuous deepening of the development of novel urbanization, the capacity of the distribution transformer almost accounts for half of the total capacity of the transformer, and the quantity of the distribution transformer is the first of the transformers in all classes. As the distribution transformer occupying the most important position of the sensing layer of the distribution network, the requirement of capability of providing comprehensive sensing information for the devices on the upper layer of the distribution transformer is also provided, including: the voltage and current information of the high-voltage incoming line, the voltage and current information of the low-voltage side outgoing line, the internal temperature information of the transformer and the on-off state information of a pressure valve of the oil-immersed distribution transformer are also provided. According to the design requirement of the power internet of things, comprehensive information perception of the distribution transformer can not only enable a power enterprise to monitor the running state of the distribution transformer, but also effectively realize all-dimensional monitoring of loss monitoring, three-phase imbalance monitoring, electric leakage monitoring, electricity larceny prevention monitoring and the like of a distribution line by utilizing the information.
At present, small-scale test operation has been carried out on medium-voltage and high-voltage substations by an electronic transformer design technology, however, a distribution transformer below 630kVA does not have the capability of monitoring current and voltage of a high-voltage incoming line, the internal temperature of the transformer and the state information of a pressure valve, and does not have the capability of carrying out interconnection communication on the information. The reason for this is that: by the limitation of the structure and the volume of the distribution transformer, the traditional electromagnetic voltage and current transformers can not be installed inside and outside the distribution transformer, so that the application can not be met. If the sensor is installed outside the high-voltage inlet end of the transformer, the sensor can only use a low-power iron core coil current transformer (LPCT) to realize the sensing of a current part under the limitation of a porcelain insulator structure of the inlet end outside the transformer, but a sensing electromagnetic voltage transformer cannot be installed, so that the sensor does not have the capability of sensing high voltage.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the combined electronic transformer overcomes the defects of the prior art, can directly replace a porcelain insulator at the top of a transformer to transmit an alternating current power supply, is internally provided with a sensor, and realizes sensing and measuring of parameters of the transformer.
The utility model provides a technical scheme that its technical problem adopted is: this a combination electronic transformer for distribution transformer, its characterized in that: the transformer comprises a shell, wherein a conducting rod which penetrates through the shell in the axial direction is arranged at the axis of the shell, and the conducting rod is positioned at the top of the transformer and used for connecting alternating current into the transformer; the shell is internally provided with a sensor, the lower part of the shell is provided with a data interface, and data output by the sensor is led out through the data interface.
Preferably, a base is arranged at the bottom of the shell, and the conducting rod penetrates through the base at the same time; the data interface is arranged on the side part of the base and is realized by adopting an aviation connector.
Preferably, the sensors include a voltage sensor, a current sensor and a temperature sensor.
Preferably, the voltage sensor is realized by adopting a group of voltage dividing resistors connected in series or a group of voltage dividing capacitors connected in series, a connecting column is arranged at the top of the shell, one end of each voltage dividing resistor or each voltage dividing capacitor is connected with the conducting rod through the connecting column, and the other end of each voltage dividing resistor or each voltage dividing capacitor is connected with the data interface.
Preferably, the voltage dividing resistor or the voltage dividing capacitor is arranged in parallel with the conductive rod in the shell.
Preferably, the connecting column is screwed into the shell and connected with the voltage dividing resistor or in series, a connecting plate with the connecting column rotating as a shaft is further arranged on the surface of the shell, and the connecting plate rotates to the conducting rod and is connected with the conducting rod.
Preferably, a notch matched with the surface radian of the conducting rod is formed in the contact position of the connecting plate and the conducting rod.
Preferably, both ends of the conducting rod are respectively provided with threads.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
through this a combination electronic transformer for distribution transformer, can directly replace the vase insulator at transformer top and carry out alternating current power supply's transmission, built-in sensor simultaneously, realized carrying out perception and measurement to the parameter of transformer, and possessed the sensing function that the electric power thing networking required simultaneously, consequently solved distribution transformer below the 630kVA of the china content of prior art because volume and inner space are less, consequently can't install the drawback of traditional electromagnetic type voltage transformer and current transformer, thereby the requirement of the electric power thing networking that national grid company proposed to perception layer equipment has been satisfied.
In order to keep the maximum compatibility with the existing distribution transformer in appearance and installation mode, the combined electronic transformer of the distribution transformer adopts the structure the same as the insulator of the high-voltage side porcelain insulator of the existing distribution transformer in appearance, so that the high-voltage side porcelain insulator of the existing distribution transformer only needs to be replaced by the combined electronic transformer when the transformer is installed, the three-phase combined electronic transformer is used for sensing high-voltage, current and temperature information, and then the shielded twisted-pair line is used for sending all paths of sensed information to the intelligent measurement terminal installed outside the distribution transformer. Therefore, the appearance of the distribution transformer does not need to be changed, and the installation mode of the distribution transformer also completely conforms to the installation mode of the porcelain insulator. In addition, the combined transformer with the porcelain insulator structure replaces the porcelain insulator at the high-voltage side wire end at present, so that the cost of the whole distribution transformer is reduced to the greatest extent while the sensing capability of high-voltage side information of the distribution transformer is improved.
Drawings
Fig. 1 is a schematic view of a combined electronic transformer installation for a distribution transformer.
Fig. 2 is a schematic structural diagram of a combined electronic transformer for a distribution transformer.
Fig. 3 is a top view of fig. 2.
Wherein: 1. the combined electronic transformer 2, the transformer 3, the connecting column 4, the shell 5, the aviation connector 6, the porcelain insulator base 7, the conducting rod 8 and the connecting plate.
Detailed Description
Fig. 1 to 3 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 3.
Example 1:
a combined electronic transformer for a distribution transformer, namely a combined electronic transformer 1 shown in figure 1, is arranged at the top of a transformer 2, and A-phase, B-phase and C-phase three-phase alternating currents are respectively connected into the transformer 2 through the corresponding electronic transformers 1. In the prior art, the top of the transformer 2 is connected into the transformer through porcelain insulator insulators, and three-phase alternating current is respectively connected into the transformer through porcelain insulator insulators, so that the combined electronic transformer (hereinafter referred to as combined electronic transformer 1) for the distribution transformer has the same appearance structure as that in the prior art.
As shown in fig. 2, the electronic transformer 1 includes a housing 4, the housing 4 has the same shape as a conventional porcelain insulator, an integrated base 6 is disposed at the bottom of the housing 4, a conducting rod 7 penetrating through the housing 4 and the base 6 is disposed at the axis of the electronic transformer 1, and ac power is connected to the transformer 2 through the conducting rod 7. The conductive rod 7 penetrates out of the bottom of the shell 4 and the bottom of the base 6 at the same time. Threads convenient to mount are respectively arranged at two ends of the conducting rod 7. An aviation connector 5 is further arranged on the side face of the base 6, a sensor is arranged in the shell 4, and signals of the sensor are led out through the aviation connector 5.
The sensor arranged inside the shell 4 comprises a current sensor, a voltage sensor and a temperature sensor, wherein the current sensor is realized by adopting an LPCT (low-power iron core coil current transformer), the LPCT uses microcrystal alloy materials as an iron core, primary large current on a high-voltage conducting rod is converted into mA-level small current, and the current sensor is arranged in the base 6. The temperature sensor is realized by adopting a two-wire PT100 thermal resistor, the temperature change is reflected on the change of the resistance value of the PT100 sensor, and the temperature information can be used for correcting the influence of the temperature on the resistance voltage division ratio, so that the precision is ensured.
In this embodiment, the voltage sensor is implemented by using a voltage dividing resistor, wherein a high-voltage resistor in the voltage dividing resistor is a 100 mega ohm resistor, and a low-voltage resistor is a precision resistor of 32.5k ohm, so that the voltage dividing resistor can theoretically output a small signal of 3.25V when the primary high voltage is 10kV (3.25V is one of the standards provided by the design specifications of the electronic transformer).
With reference to fig. 3, the high-voltage resistor and the low-voltage resistor are connected in series and then are placed in parallel with the conductive rod 7 in the shell 4, the connecting column 3 is arranged on the top surface of the shell 4, the connecting column 3 is located on one side of the conductive rod 7, the connecting column 3 can be realized by bolts, the connecting plate 8 is further arranged on the top surface of the shell 4, the connecting column 3 downwards penetrates through one end of the connecting plate 8, and therefore the connecting plate 8 can rotate by taking the connecting column 3 as an axis. The other end of the connecting plate 8 is provided with a notch, the radian of the notch is matched with that of the conducting rod 7, so that the connecting plate 8 can be rotated to the conducting rod 7 and clamped on the surface of the conducting rod 7 through the notch, and the connecting plate 8 is made of metal materials. The connecting column 3 is screwed into the shell 4 and then enters the inside of the shell, one end of the high-voltage resistor is connected with the connecting column 3, and the other end of the high-voltage resistor is connected with the low-voltage resistor; and a first lead of the voltage sensor is led out from between the high-voltage resistor and the low-voltage resistor, a second lead of the voltage sensor is led out from the other end of the low-voltage resistor, the first lead is used as a grounding wire of the voltage sensor, and two leads output by the voltage sensor are simultaneously connected to the terminal of the aviation connector 5.
When the transformer is normally used, workers need to regularly detect the insulation characteristics of the porcelain insulator to ensure the use safety of the transformer, so that the connecting plate 8 and the conducting rod 7 are disconnected during maintenance, and only the power transmission function (equal to the traditional porcelain insulator) in the electronic transformer 1 is reserved, so that the influence of a voltage sensor (a high-voltage resistor and a low-voltage resistor) on the test is avoided during the insulation characteristic test; when in normal use, the connecting plate 8 is in contact with the conducting rod 7 and is fixed through the connecting column 3, and at the moment, the electronic transformer 1 has the detection and transmission functions of corresponding parameters through a current sensor, a voltage sensor and a temperature sensor besides the electric energy transmission function of the traditional porcelain insulator.
In the combined electronic transformer for the distribution transformer, the aviation connector 5 adopts a common commercially available 7-pin connector, a male connector or a female connector of the aviation connector 5 is arranged on the side part of the base 6, and the other end of the aviation connector is inserted into the base 6 and leads out signals of the sensor through a shielding wire connected with the base 6. The aviation connector 5 is arranged in a connector (marked as a male connector) in the base 6, 6 terminals in the male connector are respectively connected with two leads of a voltage sensor, two leads of a current sensor and two leads of a temperature sensor, a 7 th terminal is used as a grounding terminal of the aviation connector 5, and a grounding wire led out from the voltage sensor is simultaneously connected to the grounding terminal of the aviation connector 5.
And 6 terminals of a connector (female connector) butted with the connector at the base 6 correspond to the voltage sensor, the current sensor and the temperature sensor and lead out corresponding signals. The 7 th of the female connectors is connected with the shielding layer of the shielding wire. During the use, intelligent measurement terminal need supply power and must have the ground wire, therefore the female head and the public head butt joint back of aviation connector 5 realize the ground connection of low voltage resistance in the voltage sensor through the shielding layer. Three combined electronic transformers 1 on the top of the transformer 2 lead out current, voltage and temperature data of the A phase, the B phase and the C phase through three double-shielded 7-core twisted pairs respectively.
Example 2:
this example differs from example 1 in that: in the present embodiment, the voltage sensor provided in the housing 4 is implemented using capacitive voltage division. Wherein the high-voltage capacitor adopts a 150pF capacitor, and the low-voltage capacitor adopts a 461nF capacitor, so that the low-voltage capacitor outputs a small signal of 3.25V when the primary high voltage is 10 kV.
The high-voltage capacitor and the low-voltage capacitor are connected in series and then are placed in parallel with the conducting rod 7 in the shell 4, and two polar plates of the high-voltage capacitor are positioned in parallel with the conducting rod, so that a uniform electric field is guaranteed between the conducting rod 7 and a capacitor polar plate, and partial discharge is avoided. One end of the high-voltage capacitor is connected with the conducting rod 7, the other end of the high-voltage capacitor is connected with the low-voltage capacitor, one end of the low-voltage capacitor is connected with the high-voltage capacitor, and the connection mode of the low-voltage capacitor and the aviation connector 5 is the same as that of the low-voltage resistor in the embodiment 1.
In the present embodiment, due to the characteristics of the capacitor itself, it is not necessary to disconnect the connection plate 8 from the conductive rod 7 during maintenance, or when a capacitor voltage dividing method is used as the voltage sensor, the connection post 3 and the connection plate 8 may be omitted directly, and the high-voltage capacitor may be connected to the conductive rod 7 inside the case 4.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (8)
1. A combination electronic transformer for distribution transformer which characterized in that: the transformer comprises a shell (4), wherein a conducting rod (7) which penetrates through the shell in the axial direction is arranged at the axis of the shell (4), and the conducting rod (7) is positioned at the top of the transformer (2) and is used for connecting alternating current into the transformer (2); a sensor is arranged in the shell (4), a data interface is arranged at the lower part of the shell (4), and data output by the sensor is led out through the data interface.
2. The combined electronic transformer for a distribution transformer according to claim 1, characterized in that: a base (6) is arranged at the bottom of the shell (4), and the conducting rod (7) penetrates through the base (6) at the same time; the data interface is arranged on the side of the base (6) and is realized by adopting an aviation connector (5).
3. The combined electronic transformer for a distribution transformer according to claim 1, characterized in that: the sensor comprises a voltage sensor, a current sensor and a temperature sensor.
4. The combined electronic transformer for a distribution transformer according to claim 3, characterized in that: the voltage sensor is realized by a group of series-connected voltage-dividing resistors or a group of series-connected voltage-dividing capacitors, a connecting column (3) is arranged at the top of the shell (4), one end of each voltage-dividing resistor or each voltage-dividing capacitor is connected with the conducting rod (7) through the connecting column (3), and the other end of each voltage-dividing resistor or each voltage-dividing capacitor is connected with a data interface.
5. The combined electronic transformer for a distribution transformer according to claim 4, characterized in that: the voltage dividing resistor or the voltage dividing capacitor is arranged in parallel with the conducting rod (7) in the shell (4).
6. The combined electronic transformer for a distribution transformer according to claim 4, characterized in that: the connecting column (3) is screwed into the shell (4) and connected with the divider resistor or in series, a connecting plate (8) with the connecting column (3) rotating as a shaft is further arranged on the surface of the shell (4), and the connecting plate (8) rotates to the conducting rod (7) and is connected with the conducting rod (7).
7. The combined electronic transformer for a distribution transformer according to claim 6, characterized in that: and a gap matched with the surface radian of the conducting rod (7) is formed in the contact position of the connecting plate (8) and the conducting rod (7).
8. The combined electronic transformer for a distribution transformer according to claim 1, characterized in that: threads are respectively arranged at two ends of the conducting rod (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921453281.0U CN210572460U (en) | 2019-09-03 | 2019-09-03 | Combined electronic transformer for distribution transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921453281.0U CN210572460U (en) | 2019-09-03 | 2019-09-03 | Combined electronic transformer for distribution transformer |
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| CN210572460U true CN210572460U (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412328A (en) * | 2019-09-03 | 2019-11-05 | 山东富澳电力设备有限公司 | A kind of combination electronic mutual inductor and measuring system for distribution transformer |
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2019
- 2019-09-03 CN CN201921453281.0U patent/CN210572460U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412328A (en) * | 2019-09-03 | 2019-11-05 | 山东富澳电力设备有限公司 | A kind of combination electronic mutual inductor and measuring system for distribution transformer |
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