CN107561326B - Electric energy metering device and power supply management system - Google Patents
Electric energy metering device and power supply management system Download PDFInfo
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- CN107561326B CN107561326B CN201710896181.4A CN201710896181A CN107561326B CN 107561326 B CN107561326 B CN 107561326B CN 201710896181 A CN201710896181 A CN 201710896181A CN 107561326 B CN107561326 B CN 107561326B
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- 238000004804 winding Methods 0.000 claims abstract description 110
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- 230000005540 biological transmission Effects 0.000 claims description 14
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- 230000009466 transformation Effects 0.000 description 15
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- 238000003723 Smelting Methods 0.000 description 1
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Abstract
The invention relates to the technical field of electric energy metering, in particular to an electric energy metering device and a power supply management system. The electric energy metering device comprises a first current transformer, a second current transformer, an electric energy meter and a controller. The embodiment of the invention has the beneficial effects that the secondary side winding of the first current transformer and the secondary side winding of the second current transformer can output two different currents, namely a large current and a small current, so that the electric energy metering device can realize accurate metering of large current and small current.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to an electric energy metering device and a power supply management system.
Background
The power supply department carries out power supply metering by adopting a mode of high-voltage power supply, high-voltage metering and acquisition terminal aiming at users with larger power loads, 10000V high-voltage/large current of a power grid is converted into 100V low-voltage/small current through a power transformer and enters the intelligent ammeter for metering, the intelligent ammeter is connected with the acquisition terminal through RS485, and the acquisition terminal sends user power consumption data obtained by metering of the intelligent ammeter to a management system of the power supply department to realize remote wireless acquisition of the power consumption data.
At present, the electric energy metering field usually adopts a conventional metering mode to meter electric energy, and for users with stable electric loads, a proper power transformer is only required to be configured, and the metering result is usually accurate, but has a few defects. Firstly, for users with larger peak-valley differences, such as rural users, electricity consumption in spring and autumn collection is only used for illumination at ordinary times, or seasonal heating of urban cells and high-energy consumption smelting electricity consumption, the normal operation is always full load and even overload operation, the load is very low when the power transformer is not started or stopped, the peak-valley differences can reach more than 10 times, the configuration of the power transformer is extremely difficult, even if the high-accuracy high-transformation-ratio transformer is configured, the accurate measurement precision can only be ensured under the rated current condition, and under the condition of the minimum current and the maximum current, although the measurement accuracy can meet the requirements of the national current verification regulations, the measurement error is far greater than the rated current, even when the user electricity load is less than 1% of the rated current of the power transformer, the conventional power transformer cannot measure the small current load, and the power loss caused by the performance of a metering device is increased.
Disclosure of Invention
Accordingly, an objective of the present invention is to provide an electric energy metering device and a power supply management system for solving the above-mentioned problems.
The embodiment of the invention provides an electric energy metering device, which comprises a first current transformer, a second current transformer, an electric energy meter and a controller;
the primary side winding of the first current transformer is arranged on an A-phase line of a three-phase power grid, the secondary side winding of the first current transformer comprises a first head end tap, a first middle tap and a first tail end tap, the first head end tap, the first middle tap and the first tail end tap are connected to an A-phase current sampling port group of the controller, the A-phase current output port group of the controller is connected with the A-phase current sampling port group of the electric energy meter, and the controller is used for sending the current value to the electric energy meter as an A-phase current sampling value when detecting that the current value of the winding between the first head end tap and the first middle tap is in a first preset threshold range, and sending the current value of the winding between the first head end tap and the first tail end tap to the electric energy meter as an A-phase current sampling value when detecting that the current value of the winding between the first head end tap and the first middle tap is in a second preset threshold range;
the primary side winding of the second current transformer is arranged on a C-phase line of the three-phase power grid, the secondary side winding of the second current transformer comprises a second head end tap, a second middle tap and a second tail end tap, the second head end tap, the second middle tap and the second tail end tap are connected to a C-phase current sampling port group of the controller, the C-phase current output port group of the controller is connected with the C-phase current sampling port group of the electric energy meter, and the controller is further used for sending the current value to the electric energy meter when detecting that the current value of the winding between the second head end tap and the second middle tap is in a third preset threshold range, and sending the current value of the winding between the second head end tap and the second tail end tap to the electric energy meter as a C-phase current sampling value when detecting that the current value of the winding between the second head end tap and the second middle tap is in a fourth preset threshold range.
Further, the electric energy metering device further comprises a voltage transformer, a primary side winding of the voltage transformer is connected to a three-phase electric circuit, a secondary side winding of the voltage transformer is connected to a voltage sampling port group of the electric energy meter, and obtained voltage sampling values of the three-phase electric energy meter are sent to the electric energy meter.
Further, the primary winding of the voltage transformer comprises a third head end tap, a third middle tap and a third tail end tap, the third head end tap is connected to the three-phase power grid A phase line, the third middle tap is connected to the three-phase power grid B phase line, the third tail end tap is connected to the three-phase power grid C phase line, the secondary winding of the voltage transformer comprises a first winding and a second winding, the first winding comprises a fourth head end tap, a fourth middle tap and a fourth tail end tap, the fourth head end tap, the fourth middle tap and the fourth tail end tap are connected to a voltage sampling port group of the electric energy meter, the second winding comprises a fifth head end tap and a fifth tail end tap, and the fifth head end tap and the fifth tail end tap are connected to a power supply port group of the controller.
Further, the electric energy metering device further comprises an acquisition terminal, wherein the acquisition terminal is connected with the electric energy meter and is used for acquiring electric energy metering obtained by the electric energy meter according to the A-phase current sampling value, the C-phase current sampling value and the voltage sampling value.
Further, the electric energy metering device sets up in the internal portion of cabinet, the cabinet body includes the cabinet door, the electric energy metering device still includes electromagnetic lock and key read head, electromagnetic lock and key read head respectively with the controller is connected, electromagnetic lock is used for locking the cabinet door, the key read head can read the opening signal that effective electronic key sent, and sends to the controller, so that the controller control electromagnetic lock opens.
Further, the three-phase electric line is provided with a high-voltage switch near the user side, the high-voltage switch is connected with the controller, the electric energy metering device further comprises a cabinet door sensor connected with the controller, the cabinet door sensor is used for detecting opening and closing state information of the cabinet door and sending the opening and closing state information to the controller, and the controller is further used for generating alarm data when the opening and closing state information judges that the cabinet door is in an opening state and controlling the high-voltage switch to switch off so as to cut off a user power supply.
Further, the electric energy metering device further comprises an acquisition terminal, wherein the acquisition terminal is connected with the controller and used for acquiring opening and closing state information of the cabinet door and the alarm data.
Further, the first current transformer, the second current transformer and the voltage transformer are integrated into a whole to form a combined type power transformer.
The embodiment of the invention also provides a power supply management system which comprises a server and the electric energy metering device, wherein the electric energy metering device is communicated with the server.
Further, the electric energy metering device is provided with a wireless transmission device, the electric energy metering device is communicated with the server through the wireless transmission device, and the wireless transmission device is a GPRS wireless transmission module.
According to the electric energy metering device and the power supply management system, the first head end tap, the first middle tap and the first tail end tap are arranged on the secondary side winding of the first current transformer, so that a first transformation ratio is formed between the primary side winding of the first current transformer and the windings between the first head end tap and the first middle tap, a second transformation ratio is formed between the primary side winding of the first current transformer and the windings between the first head end tap and the first tail end tap, and the second head end tap, the second middle tap and the second tail end tap are arranged on the secondary side winding of the second current transformer, so that a third transformation ratio is formed between the primary side winding of the second current transformer and the windings between the second head end tap and the second tail end tap, and therefore the secondary side winding of the first current transformer and the secondary side winding of the second current transformer can be different in output from each other, and the metering device can be used for metering large and small and accurate electric energy.
Further, in the electric energy metering device and the power supply management system provided by the embodiments of the present invention, a fifth head end tap and a fifth tail end tap are disposed on the secondary side winding of the voltage transformer, and the fifth head end tap and the fifth tail end tap are connected to the power supply port group of the controller, so as to provide working electric energy for the controller, so that the controller does not need an additional power supply, and the structural simplicity of the electric energy metering device is enhanced.
Further, in the electric energy metering device and the power supply system provided by the embodiments of the present invention, by setting the electromagnetic lock, the key reading head and the cabinet door sensor, the electromagnetic lock is used for locking the cabinet door, the key reading head can read the opening signal sent by the effective electronic key and send the opening signal to the controller, so that the controller controls the electromagnetic lock to be opened, and the cabinet door sensor is used for detecting the opening and closing state information of the cabinet door and sending the opening and closing state information to the controller, so that the controller does not receive the opening signal, but generates alarm data when judging that the cabinet door is in the opening state according to the opening and closing state information, and controls the high-voltage switch to switch off, so as to cut off the power supply of a user, and effectively prevent the power leakage and the potential safety hazard caused by illegal opening of the cabinet body provided with the electric energy metering device.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is to be understood that the following drawings illustrate only certain embodiments of the invention and are therefore not to be considered limiting of its scope, for the person of ordinary skill in the art may admit to other equally relevant drawings without inventive effort.
Fig. 1 is a schematic diagram of an electrical connection relationship of an electrical energy metering device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of another electrical connection relationship of the electric energy metering device according to the embodiment of the present invention.
Fig. 3 is a schematic diagram of another electrical connection relationship of the electric energy metering device according to the embodiment of the present invention.
Fig. 4 is a schematic block diagram of a power supply management system according to an embodiment of the present invention.
Icon: 10-a power management system; 100-an electric energy metering device; CTa-first current transformer; as 1-first head-end tap; as 2-first intermediate tap; as 3-first end tap; CTc-a second current transformer; cs 1-a second head-end tap; cs 2-a second intermediate tap; cs 3-second end tap; 110-an electric energy meter; 120-a controller; k-high voltage switch; PT-voltage transformer; a-a third head-end tap; b-a third intermediate tap; c-a third end tap; a-a fourth head-end tap; b-a fourth intermediate tap; c-a fourth end tap; u-fifth head-end tap; n-fifth end tap; 130-an acquisition terminal; 140-electromagnetic lock; 150-key read head; 160-cabinet door sensor; 200-server.
Detailed Description
The technical solutions in 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. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Referring to fig. 1, an embodiment of the present invention provides an electric energy metering device 100, where the electric energy metering device 100 includes a first current transformer CTa, a second current transformer CTc, an electric energy meter 110 and a controller 120.
The primary winding of the first current transformer CTa is arranged on an a-phase line of the three-phase power grid, the secondary winding of the first current transformer CTa comprises a first head end tap as1, a first middle tap as2 and a first tail end tap as3, the first head end tap as1, the first middle tap as2 and the first tail end tap as3 are connected to an a-phase current sampling port group of the controller 120, and the a-phase current output port group of the controller 120 is connected with the a-phase current sampling port group of the electric energy meter 110. The primary winding of the second current transformer CTc is disposed on a C-phase line of the three-phase power grid, the secondary winding of the second current transformer CTc includes a second head-end tap cs1, a second intermediate tap cs2 and a second tail-end tap cs3, the second head-end tap cs1, the second intermediate tap cs2 and the second tail-end tap cs3 are connected to a C-phase current sampling port group of the controller 120, and the C-phase current output port group of the controller 120 is connected to the C-phase current sampling port group of the electric energy meter 110.
The primary winding of the first current transformer CTa forms a first transformation ratio with the winding between the first head tap as1 and the first middle tap as2, the primary winding of the first current transformer CTa forms a second transformation ratio with the winding between the first head tap as1 and the first tail tap as3, and the first transformation ratio is smaller than the second transformation ratio, so that the current value of the winding between the first head tap as1 and the first middle tap as2 is larger than the current value of the winding between the first head tap as1 and the first tail tap as3, namely, relatively speaking, the winding between the first head tap as1 and the first middle tap as2 is a large current winding, the winding between the first head tap as1 and the first tail tap as3 is a small current winding, and a large current is output. The controller 120 is configured to send the current value of the winding between the first head-end tap as1 and the first intermediate tap as2 to the electric energy meter 110 as an a-phase current sampling value when detecting that the current value of the winding between the first head-end tap as1 and the first intermediate tap as2 is within a first preset threshold range, and send the current value of the winding between the first head-end tap as1 and the first end tap as3 to the electric energy meter 110 as an a-phase current sampling value when detecting that the current value of the winding between the first head-end tap as1 and the first intermediate tap as2 is within a second preset threshold range. In this embodiment, the first preset threshold range may be 20% -120% of the rated current of the secondary winding of the first current transformer CTa, and the second preset threshold range may be 0% -20% of the rated current of the secondary winding of the first current transformer CTa, which is specifically set according to practical application requirements.
Also, a third transformation ratio is formed between the primary winding of the second current transformer CTc and the windings between the second head-end tap cs1 and the second intermediate tap cs2, a fourth transformation ratio is formed between the primary winding of the second current transformer CTc and the windings between the second head-end tap cs1 and the second end tap cs3, and the third transformation ratio is smaller than the fourth transformation ratio, so that the current value of the windings between the second head-end tap cs1 and the second intermediate tap cs2 is larger than the current value of the windings between the second head-end tap cs1 and the second end tap cs3, that is, relatively speaking, the windings between the second head-end tap cs1 and the second intermediate tap cs2 are large current windings, and the windings between the second head-end tap cs1 and the second end tap cs3 are small current windings, and output small current. The controller 120 is further configured to send the current value of the winding between the second head-end tap cs1 and the second intermediate tap cs2 to the electric energy meter 110 as a C-phase current sampling value when detecting that the current value of the winding between the second head-end tap cs1 and the second intermediate tap cs2 is within a third preset threshold range, and send the current value of the winding between the second head-end tap cs1 and the second end tap cs3 to the electric energy meter 110 as a C-phase current sampling value when detecting that the current value of the winding between the second head-end tap cs1 and the second intermediate tap cs2 is within a fourth preset threshold range. In this embodiment, the third preset threshold range may be 20% -120% of the rated current of the secondary winding of the second current transformer CTc, and the fourth preset threshold range may be 0% -20% of the rated current of the secondary winding of the second current transformer CTc, which is specifically set according to practical application requirements.
In this embodiment, the voltage of the three-phase three-wire system power grid with the rated voltage of 10000V is connected to the voltage transformer PT for sampling the voltage in addition to the sampling currents of the first current transformer CTa and the second current transformer CTc, and then the voltage is transmitted to the user side through the high-voltage switch K near the user side. Thus, in this embodiment, the electric energy metering device 100 further includes a voltage transformer PT, a primary winding of the voltage transformer PT is connected to a three-phase electric line, a secondary winding of the voltage transformer PT is connected to a voltage sampling port group of the electric energy meter 110, and the obtained voltage sampling value of the three-phase electric energy meter 110 is sent to the electric energy meter 110. Optionally, in this embodiment, the first current transformer CTa, the second current transformer CTc and the voltage transformer PT are integrated together to form a combined power transformer, so as to enhance the structural simplicity of the electric energy metering device 100. It may be appreciated that in this embodiment, the power transformer is a three-phase three-wire power transformer, and the electric energy meter 110 is a three-phase three-wire intelligent electric energy meter. In addition, it should be noted that, in this embodiment, the electric energy metering device 100 is also suitable for three-phase four-wire system electric energy metering, and specifically adjusted according to practical application requirements, for example, the electric power transformer is replaced by a three-phase four-wire type electric power transformer, and the electric energy meter 110 is replaced by a three-phase four-wire type intelligent electric energy meter.
The primary winding of the voltage transformer PT includes a third head-end tap a, a third intermediate tap B and a third end tap C, where the third head-end tap a is connected to the three-phase network a-phase line, the third intermediate tap B is connected to the three-phase network B-phase line, and the third end tap C is connected to the three-phase network C-phase line. The secondary winding of the voltage transformer PT includes a first winding and a second winding, the first winding includes a fourth head-end tap a, a fourth intermediate tap b and a fourth end tap c, the fourth head-end tap a, the fourth intermediate tap b and the fourth end tap c are connected to a voltage sampling port group of the electric energy meter 110 to transmit the obtained voltage sampling values of the three-phase power to the electric energy meter 110, the second winding includes a fifth head-end tap u and a fifth end tap n, and the fifth head-end tap u and the fifth end tap n are connected to a power supply port group of the controller 120 to provide operating power for the controller 120. Optionally, in this embodiment, the rated voltage of the first winding of the secondary winding of the voltage transformer PT is 100V, and the rated voltage of the second winding of the secondary winding of the voltage transformer PT is 220V.
Through the above arrangement, the secondary winding of the first current transformer CTa and the secondary winding of the second current transformer CTc can both output two different currents, so that the electric energy metering device 100 can accurately meter large current and small current, and the fifth head end tap u and the fifth tail end tap n of the secondary winding of the voltage transformer PT are connected to the power supply port group of the controller 120 to provide working electric energy for the controller 120, so that the controller 120 does not need an additional power supply, thereby further enhancing the structural simplicity of the electric energy metering device 100.
Referring to fig. 2, optionally, in this embodiment, the electric energy metering device 100 further includes an acquisition terminal 130, where the acquisition terminal 130 is connected to the electric energy meter 110, and is configured to obtain electric energy metering obtained by the electric energy meter 110 according to the a-phase current sampling value, the C-phase current sampling value, and the voltage sampling value. Specifically, in this embodiment, the acquisition terminal 130 is connected to the controller 120 through an RS485 serial bus. Optionally, in this embodiment, the collecting terminal 130 may also communicate with a server of a power supply management system of the power supply department through a wireless transmission device, and send the electric energy measurement to the server, so as to implement remote wireless meter reading of data.
In practical application, the electric energy metering device 100 is disposed inside a cabinet body, and the cabinet body includes a cabinet door. Referring to fig. 3, in order to enhance the use safety of the electric energy metering device 100, optionally, in this embodiment, the electric energy metering device 100 further includes an electromagnetic lock 140 and a key reading head 150, where the electromagnetic lock 140 and the key reading head 150 are respectively connected to the controller 120, the electromagnetic lock 140 is used for locking the cabinet door, and the key reading head 150 can read an opening signal sent by an effective electronic key and send the opening signal to the controller 120, so that the controller 120 controls the electromagnetic lock 140 to be opened. In this embodiment, the start signal may include a start time and identification information of the valid electronic key, and may also be understood as identity information of the holder of the valid electronic key. Note that, in this embodiment, the opening time of the electromagnetic lock 140 may also be sent to the controller 120 by the electromagnetic lock 140, and in this embodiment, when the electromagnetic lock 140 is closed, the electromagnetic lock 140 also sends the closing time to the controller 120.
In order to further enhance the use safety of the electric energy metering device 100, optionally, in this embodiment, the controller 120 is further connected to the high-voltage switch K, the electric energy metering device 100 further includes a cabinet door sensor 160 connected to the controller 120, where the cabinet door sensor 160 is configured to detect opening and closing state information of the cabinet door and send the opening and closing state information to the controller 120, and the controller 120 is further configured to generate alarm data when the opening signal is not received, but determines that the cabinet door is in the open state according to the opening and closing state information, and control the high-voltage switch K to switch off, so as to cut off a user power supply. After that, as a way of recovering the user power, optionally, in this embodiment, after the key reading head 150 reads the closing control signal sent by the valid electronic key and sends the closing control signal to the controller 120, the controller 120 controls the high-voltage switch K to close, so as to recover the user power. Therefore, the problem that the non-effective electronic key holder forcibly opens the cabinet door of the cabinet body to cause electricity stealing, electricity leakage and potential safety hazard can be avoided. In this embodiment, the cabinet door sensor 160 may be a hall sensor or a door magnetic sensor, which is not limited in this embodiment.
Optionally, in this embodiment, the acquisition terminal 130 is further connected to the controller 120, and is configured to obtain the opening and closing state information of the cabinet door and the alarm data. Specifically, in this embodiment, the acquisition terminal 130 is connected to the controller 120 through an RS485 serial bus. Also, optionally, in this embodiment, the collecting terminal 130 may also communicate with a server of a power supply management system of the power supply department through a wireless transmission device, and send the opening and closing state information and the alarm data to the server for recording, and meanwhile, the power supply department is also convenient to process in time, so as to improve the power supply standardization management level.
Referring to fig. 4, an embodiment of the present invention further provides a power supply management system 10, where the power supply management system 10 includes a server 200 and the electric energy metering device 100, and the electric energy metering device 100 communicates with the server 200. In this embodiment, the server 200 may be a server of a power supply department power supply management system.
Further, the electric energy metering device 100 is provided with a wireless transmission device, the electric energy metering device 100 communicates with the server 200 through the wireless transmission device, and the wireless transmission device is a GPRS wireless transmission module. Optionally, in this embodiment, the wireless transmission device is disposed at the acquisition terminal 130.
In summary, in the electric energy metering device and the power supply management system provided by the embodiments of the present invention, the first end tap as1, the first intermediate tap as2 and the first end tap as3 are disposed on the secondary side winding of the first current transformer CTa, so that a first transformation ratio is formed between the primary side winding of the first current transformer CTa and the windings between the first end tap as1 and the first intermediate tap as2, a second transformation ratio is formed between the primary side winding of the first current transformer CTa and the windings between the first end tap as1 and the first end tap as3, and similarly, a second first end tap cs1, a second intermediate tap cs2 and the second end tap cs3 are disposed on the secondary side winding of the second current transformer CTc, so that a third transformation ratio is formed between the primary side winding of the second current transformer CTc and the windings between the second first end tap cs1 and the second intermediate tap cs2, and a second transformation ratio is not formed between the primary side winding of the second current transformer CTc and the second end tap cs1, and a second end transformer c is enabled to be larger, and thus the current transformer is enabled to be smaller than the first current transformer CTc, and the second current transformer is enabled to be smaller than the second current transformer 100.
Further, in the electric energy metering device and the power supply management system provided by the embodiments of the present invention, the fifth head-end tap u and the fifth tail-end tap n are disposed on the secondary winding of the voltage transformer PT, and the fifth head-end tap u and the fifth tail-end tap n are connected to the power supply port group of the controller 120, so as to provide working electric energy for the controller 120, thereby enhancing the simplicity of the structure of the electric energy metering device 100.
Further, in the electric energy metering device and the power supply system provided by the embodiments of the present invention, by setting the electromagnetic lock 140, the key reading head 150 and the cabinet door sensor 160, wherein the electromagnetic lock 140 is used for locking the cabinet door, the key reading head 150 can read the opening signal sent by the effective electronic key and send the opening signal to the controller 120, so that the controller 120 controls the electromagnetic lock 140 to be opened, and the cabinet door sensor 160 is used for detecting the opening and closing state information of the cabinet door and sending the opening and closing state information to the controller 120, so that the controller 120 generates alarm data when the opening signal is not received, but determines that the cabinet door is in the opening state according to the opening and closing state information, and controls the high-voltage switch K to be opened, so as to cut off the power supply of the user, thereby effectively preventing the power leakage and the potential safety hazard caused by illegal opening of the cabinet body provided with the electric energy metering device 100.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should also be noted that the azimuth or positional relationship indicated by the terms "inner" and "outer" and the like are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that the inventive product is conventionally put in use, merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The electric energy metering device is characterized by comprising a first current transformer, a second current transformer, an electric energy meter and a controller;
the primary side winding of the first current transformer is arranged on an A-phase line of a three-phase power grid, the secondary side winding of the first current transformer comprises a first head end tap, a first middle tap and a first tail end tap, the first head end tap, the first middle tap and the first tail end tap are connected to an A-phase current sampling port group of the controller, the A-phase current output port group of the controller is connected with the A-phase current sampling port group of the electric energy meter, and the controller is used for sending the current value to the electric energy meter as an A-phase current sampling value when detecting that the current value of the winding between the first head end tap and the first middle tap is in a first preset threshold range, and sending the current value of the winding between the first head end tap and the first tail end tap to the electric energy meter as an A-phase current sampling value when detecting that the current value of the winding between the first head end tap and the first middle tap is in a second preset threshold range;
the primary side winding of the second current transformer is arranged on a C-phase line of the three-phase power grid, the secondary side winding of the second current transformer comprises a second head end tap, a second middle tap and a second tail end tap, the second head end tap, the second middle tap and the second tail end tap are connected to a C-phase current sampling port group of the controller, the C-phase current output port group of the controller is connected with the C-phase current sampling port group of the electric energy meter, and the controller is further used for sending the current value to the electric energy meter when detecting that the current value of the winding between the second head end tap and the second middle tap is in a third preset threshold range, and sending the current value of the winding between the second head end tap and the second tail end tap to the electric energy meter as a C-phase current sampling value when detecting that the current value of the winding between the second head end tap and the second middle tap is in a fourth preset threshold range.
2. The electric energy metering device of claim 1, further comprising a voltage transformer, wherein a primary winding of the voltage transformer is connected to a three-phase power line, and a secondary winding of the voltage transformer is connected to a set of voltage sampling ports of the electric energy meter, and the obtained voltage sampling values of the three-phase power are transmitted to the electric energy meter.
3. The electrical energy metering device of claim 2 wherein the primary side winding of the voltage transformer comprises a third head end tap, a third intermediate tap and a third end tap, the third head end tap connected to the three-phase grid a-phase line, the third intermediate tap connected to the three-phase grid B-phase line, the third end tap connected to the three-phase grid C-phase line, the secondary side winding of the voltage transformer comprises a first winding and a second winding, the first winding comprises a fourth head end tap, a fourth intermediate tap and a fourth end tap, the fourth head end tap, the fourth intermediate tap and the fourth end tap are connected to a set of voltage sampling ports of the electrical energy meter, the second winding comprises a fifth head end tap and a fifth end tap, the fifth head end tap and the fifth end tap are connected to a set of power supply ports of the controller.
4. The electrical energy metering device of claim 2 further comprising an acquisition terminal connected to the electrical energy meter for obtaining an electrical energy meter from the a-phase current sample, the C-phase current sample, and the voltage sample.
5. The electric energy metering device of claim 1, wherein the electric energy metering device is disposed inside a cabinet body, the cabinet body comprises a cabinet door, the electric energy metering device further comprises an electromagnetic lock and a key reading head, the electromagnetic lock and the key reading head are respectively connected with the controller, the electromagnetic lock is used for locking the cabinet door, and the key reading head can read an opening signal sent by an effective electronic key and send the opening signal to the controller so that the controller can control the electromagnetic lock to be opened.
6. The electric energy metering device of claim 5, wherein the three-phase electric line is provided with a high-voltage switch near a user side, the high-voltage switch is connected with the controller, the electric energy metering device further comprises a cabinet door sensor connected with the controller, the cabinet door sensor is used for detecting opening and closing state information of the cabinet door and sending the opening and closing state information to the controller, and the controller is further used for generating alarm data when the opening signal is not received, but judging that the cabinet door is in an opening state according to the opening and closing state information, and controlling the high-voltage switch to be opened so as to cut off a user power supply.
7. The electrical energy metering device of claim 6 further comprising an acquisition terminal connected to the controller for acquiring the door open and closed status information, and the alarm data.
8. The electrical energy metering device of claim 1 wherein the first current transformer, the second current transformer and the voltage transformer are integrated to form a combined power transformer.
9. A power management system comprising a server and the power metering device of any one of claims 1 to 8, the power metering device in communication with the server.
10. The power management system of claim 9, wherein the power metering device is provided with a wireless transmission device through which the power metering device communicates with the server, the wireless transmission device being a GPRS wireless transmission module.
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