CN219018530U - Power supply system for metering electric energy meter and metering device for photovoltaic power station - Google Patents
Power supply system for metering electric energy meter and metering device for photovoltaic power station Download PDFInfo
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- CN219018530U CN219018530U CN202223222193.4U CN202223222193U CN219018530U CN 219018530 U CN219018530 U CN 219018530U CN 202223222193 U CN202223222193 U CN 202223222193U CN 219018530 U CN219018530 U CN 219018530U
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Abstract
The application discloses a power supply system of measurement electric energy meter and metering device of photovoltaic power plant relates to electric power technical field, include: the power supply comprises an uninterruptible power supply, an electric energy meter power supply, a first switch circuit and a second switch circuit; the first switch circuit is respectively connected with the power supply of the electric energy meter, the metering electric energy meter and the second switch circuit; the second switch circuit is respectively connected with the uninterrupted power supply, the metering electric energy meter and the first switch circuit; when the power supply of the electric energy meter is normal, the first switch circuit is turned on, the second switch circuit is turned off, and the electric energy meter power supply supplies power for the metering electric energy meter; when the power supply of the electric energy meter is abnormal, the first switch circuit is turned off, the second switch circuit is turned on, and the uninterrupted power supply supplies power to the metering electric energy meter after being reduced by the transformer. The power supply system can improve the line loss standard rate, and is low in cost, simple and applicable.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a power supply system for a metering electric energy meter; and also relates to a metering device of the photovoltaic power station.
Background
The line loss rate refers to the percentage of the power lost in the power network (line loss load) to the power supplied to the power network (supply load). The line loss rate is used for checking the running economy of the power system, and is a comprehensive technical index of power supply enterprises. The acquisition failure of the metering electric energy meter of the photovoltaic power station can directly influence the line loss standard rate, so that countermeasures are taken in a targeted manner, loss reduction measures are developed, and loss reduction force is increased. When the circuit is powered off, the metering electric energy meter can recover metering only after waiting for manual recovery of power transmission, and the time required for waiting for personnel to recover power transmission on site is long, so that the collection of the photovoltaic electric quantity is greatly influenced.
Aiming at the situation, at present, a technical improvement of a contact equipment manufacturer is adopted, and a power supply scheme of enough capacity power supply equipment is specially arranged for a narrow space, however, the scheme relates to field design construction of the manufacturer, and has high cost and high difficulty.
Therefore, providing a power supply scheme that can improve the line loss standard rate, has low cost and is simple and applicable has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model aims at providing a metering power system of measurement electric energy meter and metering device of photovoltaic power plant can improve the line loss rate of reaching standard, and with low costs, simple being suitable for.
For solving the technical problem, the application provides a power supply system of a metering electric energy meter, which comprises:
the power supply comprises an uninterruptible power supply, an electric energy meter power supply, a first switch circuit and a second switch circuit; the first switch circuit is respectively connected with the power supply of the electric energy meter, the metering electric energy meter and the second switch circuit; the second switch circuit is respectively connected with the uninterrupted power supply, the metering electric energy meter and the first switch circuit;
when the power supply of the electric energy meter is normal, the first switch circuit is turned on, the second switch circuit is turned off, and the electric energy meter power supply supplies power to the metering electric energy meter;
when the power supply of the electric energy meter is abnormal, the first switch circuit is turned off, the second switch circuit is turned on, and the uninterrupted power supply supplies power to the metering electric energy meter after being reduced by the transformer.
Optionally, the first switching circuit includes:
a relay and a first contactor; the coil of the relay is connected with the electric energy meter power supply, the normally open contact of the relay is connected with the coil of the first contactor, the normally closed contact of the relay is connected with the second switch circuit, and the first normally open contact of the first contactor is connected with the electric energy meter power supply and the metering electric energy meter; when the relay is electrified, the first contactor is electrified, the electric energy meter power supply supplies power for the metering electric energy meter, and the second switch circuit is turned off; when the relay is powered off, the first contactor is powered off, the second switch circuit is conducted, and the uninterrupted power supply supplies power to the metering electric energy meter after being reduced by the transformer.
Optionally, the first switch circuit specifically includes three paths of relays, namely a first relay, a second relay and a third relay; one ends of the coils of the first relay, the second relay and the third relay are respectively connected with one phase of the electric energy meter power supply, and the other ends of the coils of the first relay, the second relay and the third relay are connected; the normally closed contacts of the first relay, the second relay and the third relay and the first normally closed contact of the first contactor are connected in series and then connected with the second switch circuit; one ends of the normally open contacts of the first relay and the second relay are respectively connected with one end of the coil of the first contactor, and the other ends of the normally open contacts of the first relay and the second relay are respectively connected with one phase of the electric energy meter power supply.
Optionally, the first switching circuit further includes:
a time relay; the coil of the time relay is connected in series with the normally open contact of the third relay and the second normally closed contact of the first contactor, the normally open contact of the time relay is connected in series with the normally open contact of the first relay and the coil of the first contactor, and the normally open contact of the time relay is also connected in parallel with the second normally open contact of the first contactor.
Optionally, the second switching circuit includes:
a second contactor; the coil of the second contactor is connected with the normally closed contacts of the first relay, the second relay and the third relay and the first normally closed contact of the first contactor in series, the normally open contact of the second contactor is connected between the transformer and the metering electric energy meter, and the normally closed contact of the second contactor is connected with the coil of the time relay, the normally open contact of the third relay and the second normally closed contact of the first contactor in series.
Optionally, the method further comprises:
a three-phase air switch; the three-phase air switch is connected between the electric energy meter power supply and the metering electric energy meter.
Optionally, the method further comprises:
a single-phase air switch; the single-phase air switch is connected between the uninterruptible power supply and the metering electric energy meter.
In order to solve the technical problem, the application further provides a metering device of the photovoltaic power station, which comprises a metering electric energy meter and a power supply system of the metering electric energy meter.
The power supply system of the metering electric energy meter that this application provided includes: the power supply comprises an uninterruptible power supply, an electric energy meter power supply, a first switch circuit and a second switch circuit; the first switch circuit is respectively connected with the power supply of the electric energy meter, the metering electric energy meter and the second switch circuit; the second switch circuit is respectively connected with the uninterrupted power supply, the metering electric energy meter and the first switch circuit; when the power supply of the electric energy meter is normal, the first switch circuit is turned on, the second switch circuit is turned off, and the electric energy meter power supply supplies power to the metering electric energy meter; when the power supply of the electric energy meter is abnormal, the first switch circuit is turned off, the second switch circuit is turned on, and the uninterrupted power supply supplies power to the metering electric energy meter after being reduced by the transformer.
Therefore, when the power supply of the electric energy meter is abnormal, the power supply system of the metering electric energy meter can immediately recover the power supply of the metering electric energy meter by the uninterruptible power supply. Compared with the mode of waiting for manual power restoration, the power supply system provided by the application can greatly reduce the power-off time of the metering electric energy meter, improve the line loss standard rate, has simple and applicable structure and low production cost, and is suitable for large-area and wide application. Meanwhile, the power supply to the metering electric energy meter can be automatically recovered, so that the burden of workers can be reduced, the time consumption of work is shortened, and the line loss management level is improved.
The metering device of the photovoltaic power station has the technical effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the prior art and embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a power supply system of a metering electric energy meter according to an embodiment of the present application;
fig. 2 is a schematic diagram of a power supply system of another metering electric energy meter according to an embodiment of the present application.
Detailed Description
The core of the application is to provide a power supply system of measurement electric energy meter and metering device of photovoltaic power plant, can improve the line loss rate of reaching standard, and with low costs, simple being suitable for.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a schematic diagram of a power supply system of a metering electric energy meter according to an embodiment of the present application, and referring to fig. 1, the power supply system includes:
an uninterruptible power supply 10, an ammeter power supply 20, a first switching circuit 30 and a second switching circuit 40; the first switch circuit 30 is respectively connected with the electric energy meter power supply 20, the metering electric energy meter and the second switch circuit 40; the second switch circuit 40 is respectively connected to the uninterruptible power supply 10, the meter and the first switch circuit 30;
when the power supply of the electric energy meter power supply 20 is normal, the first switch circuit 30 is turned on, the second switch circuit 40 is turned off, and the electric energy meter power supply 20 supplies power to the metering electric energy meter;
when the power supply of the electric energy meter power supply 20 is abnormal, the first switch circuit 30 is turned off, the second switch circuit 40 is turned on, and the uninterrupted power supply 10 supplies power to the metering electric energy meter after being reduced by the transformer.
The ups 10 is a device for connecting a storage battery to a host, and converting dc power into mains power through a module circuit such as a host inverter, and is mainly used for providing stable and uninterrupted power supply to a single computer, a computer network system, or other power electronic devices such as solenoid valves, pressure transmitters, and the like. In this embodiment, on the basis of the electric energy meter power supply 20, an uninterruptible power supply 10 is provided, and two paths of power supply channels are respectively formed. In addition, the present application provides two switching circuits, namely, a first switching circuit 30 and a second switching circuit 40, and the first switching circuit 30 and the second switching circuit 40 select a power source for supplying power to the metering electric energy meter. The first switching circuit 30 controls not only the conductive state of the power supply channel between the meter power supply 20 and the meter, but also the conductive state of the second switching circuit 40. The second switching circuit 40 controls the conduction state of the power supply channel between the uninterruptible power supply 10 and the meter.
If the electric energy meter power supply 20 is normal, the first switch circuit 30 is turned on, the power supply channel between the electric energy meter power supply 20 and the metering electric energy meter is turned on, the second switch circuit 40 is turned off, the power supply channel between the uninterruptible power supply 10 and the metering electric energy meter is turned off, and at the moment, the 110V electric energy meter power supply 20 supplies power for the metering electric energy meter. If the electric energy meter power supply 20 is abnormal, the first switch circuit 30 is turned off, the power supply channel between the electric energy meter power supply 20 and the metering electric energy meter is turned off, the second switch circuit 40 is turned on, the power supply channel between the uninterruptible power supply 10 and the metering electric energy meter is turned on, and at the moment, the 220V uninterruptible power supply 10 is powered for the metering electric energy meter after being reduced to 110V through the transformer.
On the premise of realizing the above functions, the circuit structures of the first switch circuit 30 and the second switch circuit 40 may be set differently, which is not limited in this application.
In some embodiments, the first switching circuit 30 includes:
a relay and a first contactor KM1; the coil of the relay is connected with the electric energy meter power supply 20, the normally open contact of the relay is connected with the coil of the first contactor KM1, the normally closed contact of the relay is connected with the second switching circuit 40, and the first normally open contact KM1-1 of the first contactor KM1 is connected with the electric energy meter power supply 20 and the metering electric energy meter; when the relay is powered on, the first contactor KM1 is powered on, the electric energy meter power supply 20 supplies power for the metering electric energy meter, and the second switch circuit 40 is turned off; when the relay is powered off, the first contactor KM1 is powered off, the second switching circuit 40 is turned on, and the uninterruptible power supply 10 supplies power to the metering ammeter after being reduced by the transformer.
In the present embodiment, the first switching circuit 30 includes a relay and a first contactor KM1. The relay and the first contactor KM1 are used for obtaining and losing electricity, so that the electric energy meter power supply 20 supplies power for the metering electric energy meter when the electric energy meter power supply 20 is normal, and the metering electric energy meter is immediately switched to be powered for the metering electric energy meter after being reduced by the uninterrupted power supply 10 through a transformer when the metering electric energy meter is abnormal.
In some embodiments, referring to fig. 2, the first switching circuit 30 specifically includes three relays, namely a first relay KA1, a second relay KA2, and a third relay KA3; one ends of the coils of the first relay KA1, the second relay KA2 and the third relay KA3 are respectively connected with one phase of the electric energy meter power supply 20, and the other ends of the coils of the first relay KA1, the second relay KA2 and the third relay KA3 are connected; the normally-closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 and the first normally-closed contacts KM1-11 of the first contactor KM1 are connected in series and then connected with the second switching circuit 40; one ends of normally open contacts of the first relay KA1 and the second relay KA2 are respectively connected with one end of a coil of the first contactor KM1, and the other ends of normally open contacts of the first relay KA1 and the second relay KA2 are respectively connected with one phase of the electric energy meter power supply 20.
Therefore, when the electric energy meter power supply 20 is normal, the first relay KA1, the second relay KA2 and the third relay KA3 are powered on, the normally open contacts of the first relay KA1 and the second relay KA2 are closed, the first contactor KM1 is powered on, the first normally open contact KM1-1 of the first contactor KM1 is closed, the first switch circuit 30 is conducted at the moment, and the electric energy meter power supply 20 supplies power for the metering electric energy meter. Meanwhile, the normally-closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are opened, the first normally-closed contacts KM1-11 of the first contactor KM1 are opened, and the second switching circuit 40 is turned off.
When the electric energy meter power supply 20 is abnormal, the first relay KA1, the second relay KA2 and the third relay KA3 lose electricity, normally open contacts of the first relay KA1 and the second relay KA2 are opened, the first contactor KM1 loses electricity, a first normally open contact KM1-1 of the first contactor KM1 is opened, and at the moment, the first switch circuit 30 is turned off. Meanwhile, normally closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are closed, the first normally closed contacts KM1-11 of the first contactor KM1 are closed, the second switching circuit 40 is conducted, and at the moment, the uninterrupted power supply 10 supplies power to the metering ammeter after voltage reduction through a transformer.
Further, referring to fig. 2, in some embodiments, the first switching circuit 30 further includes:
a time relay KT; the coil of the time relay KT is connected in series with the normally open contact of the third relay KA3 and the second normally closed contacts KM1-12 of the first contactor KM1, the normally open contact of the time relay KT is connected in series with the normally open contact of the first relay KA1 and the coil of the first contactor KM1, and the normally open contact of the time relay KT is also connected in parallel with the second normally open contact KM1-2 of the first contactor KM1.
Therefore, when the electric energy meter power supply 20 is normal, the first relay KA1, the second relay KA2 and the third relay KA3 are powered on, the normally open contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are closed, the time relay KT is powered on, the normally open contacts of the time relay KT are closed after a period of time delay (for example, 600 s), the first contactor KM1 is powered on, the first normally open contact KM1-1 of the first contactor KM1 is closed, at the moment, the first switch circuit 30 is turned on, and the electric energy meter power supply 20 supplies power for the metering electric energy meter. At the same time, the second normally open contact KM1-2 of the first contactor KM1 is closed and self-sustaining. Normally-closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are opened, the first normally-closed contacts KM1-11 of the first contactor KM1 are opened, and the second switching circuit 40 is turned off.
When the electric energy meter power supply 20 is abnormal, the first relay KA1, the second relay KA2 and the third relay KA3 lose electricity, the time relay KT loses electricity, normally open contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are opened, the first contactor KM1 loses electricity, the first normally open contact KM1-1 and the second normally open contact KM1-2 of the first contactor KM1 are opened, and at the moment, the first switch circuit 30 is turned off. Meanwhile, normally closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are closed, the first normally closed contacts KM1-11 of the first contactor KM1 are closed, the second switching circuit 40 is conducted, and at the moment, the uninterrupted power supply 10 supplies power to the metering ammeter after voltage reduction through a transformer.
Referring to fig. 2, in some embodiments, the second switching circuit 40 includes:
a second contactor KM2; the coil of the second contactor KM2 is connected with the normally closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 and the first normally closed contacts KM1-11 of the first contactor KM1 in series, the normally open contact of the second contactor is connected between the transformer and the metering electric energy meter, and the normally closed contact of the second contactor KM2 is connected with the coil of the time relay KT, the normally open contact of the third relay KA3 and the second normally closed contacts KM1-12 of the first contactor KM1 in series.
When the electric energy meter power supply 20 is normal, the first relay KA1, the second relay KA2 and the third relay KA3 are powered on, normally open contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are closed, the time relay KT is powered on, the normally open contacts of the time relay KT are closed after a period of time delay, the first contactor KM1 is powered on, the first normally open contact KM1-1 of the first contactor KM1 is closed, at the moment, the first switch circuit 30 is conducted, and the electric energy meter power supply 20 supplies power for the metering electric energy meter. At the same time, the second normally open contact KM1-2 of the first contactor KM1 is closed and self-sustaining. Normally closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are opened, the first normally closed contacts KM1-11 of the first contactor KM1 are opened, a coil of the second contactor KM2 is powered off, a normally open contact of the second contactor KM2 is opened, and the second switching circuit 40 is turned off.
When the electric energy meter power supply 20 is abnormal, the first relay KA1, the second relay KA2 and the third relay KA3 lose electricity, the time relay KT loses electricity, normally open contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are opened, the first contactor KM1 loses electricity, the first normally open contact KM1-1 and the second normally open contact KM1-2 of the first contactor KM1 are opened, and at the moment, the first switch circuit 30 is turned off. Meanwhile, normally closed contacts of the first relay KA1, the second relay KA2 and the third relay KA3 are closed, the first normally closed contacts KM1-11 of the first contactor KM1 are closed, a coil of the second contactor KM2 is electrified, a normally open contact of the second contactor KM2 is closed, the second switching circuit 40 is conducted, and at the moment, the uninterrupted power supply 10 supplies power for the metering ammeter after voltage reduction through a transformer. In addition, the normally closed contact of the second contactor KM2 is opened.
Further, referring to fig. 2, on the basis of the above embodiment, as a specific implementation manner, the method further includes:
a three-phase air switch QS1; the three-phase air switch QS1 is connected between the electric energy meter power supply 20 and the metering electric energy meter. Under the condition that the three-phase air switch QS1 is closed, if the electric energy meter power supply 20 is normal, the electric energy meter power supply 20 supplies power normally, and the electric energy meter power supply 20 supplies power for the metering electric energy meter. If the electric energy meter power supply 20 is normal, the three-phase air switch QS1 trips, and at the moment, the electric energy meter power supply 20 supplies power abnormally. If the electric energy meter power supply 20 is abnormal, the three-phase air switch QS1 is closed, and at the moment, the electric energy meter power supply 20 supplies power abnormally.
Further, referring to fig. 2, on the basis of the above embodiment, as a specific implementation manner, the method further includes:
a single-phase air switch QS2; the single-phase air switch QS2 is connected between the uninterruptible power supply 10 and the meter. Under the condition that the single-phase air switch QS2 is closed, if the electric energy meter power supply 20 is abnormal, the electric energy meter is immediately powered by the uninterrupted power supply 10 after being reduced by a transformer.
The control box of the power supply system can be a stainless steel box body, and is corrosion-resistant, rust-resistant and light. The uninterrupted power supply 10 and the transformer are moisture-proof, high-temperature-resistant, high-humidity-resistant and reliable in long-term operation.
In summary, the power supply system of the metering electric energy meter provided by the application can immediately restore to supply power to the metering electric energy meter by the uninterruptible power supply when the power supply of the electric energy meter is abnormal and the metering electric energy meter is powered off. Compared with the mode of waiting for manual power restoration, the power supply system provided by the application can greatly reduce the power-off time of the metering electric energy meter, improve the line loss standard rate, has simple and applicable structure and low production cost, and is suitable for large-area and wide application. Meanwhile, the power supply to the metering electric energy meter can be automatically recovered, so that the burden of workers can be reduced, the time consumption of work is shortened, and the line loss management level is improved.
The application also provides a metering device of the photovoltaic power station, which comprises a metering electric energy meter and a power supply system of the metering electric energy meter, wherein the power supply system is described in any embodiment. For the metering device of the photovoltaic power station provided in the present application, reference may be made to the embodiment of the power supply system described above, which is not described herein again.
The technical scheme provided by the embodiment of the application is described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. The metering device disclosed in the embodiment corresponds to the power supply system disclosed in the embodiment, so that the description is simpler, and the relevant points are only needed to be referred to the description of the power supply system.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the core ideas of the present application. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (8)
1. A power supply system for a metering electric energy meter, comprising:
the power supply comprises an uninterruptible power supply, an electric energy meter power supply, a first switch circuit and a second switch circuit; the first switch circuit is respectively connected with the power supply of the electric energy meter, the metering electric energy meter and the second switch circuit; the second switch circuit is respectively connected with the uninterrupted power supply, the metering electric energy meter and the first switch circuit;
when the power supply of the electric energy meter is normal, the first switch circuit is turned on, the second switch circuit is turned off, and the electric energy meter power supply supplies power to the metering electric energy meter;
when the power supply of the electric energy meter is abnormal, the first switch circuit is turned off, the second switch circuit is turned on, and the uninterrupted power supply supplies power to the metering electric energy meter after being reduced by the transformer.
2. The power supply system of claim 1, wherein the first switching circuit comprises:
a relay and a first contactor; the coil of the relay is connected with the electric energy meter power supply, the normally open contact of the relay is connected with the coil of the first contactor, the normally closed contact of the relay is connected with the second switch circuit, and the first normally open contact of the first contactor is connected with the electric energy meter power supply and the metering electric energy meter; when the relay is electrified, the first contactor is electrified, the electric energy meter power supply supplies power for the metering electric energy meter, and the second switch circuit is turned off; when the relay is powered off, the first contactor is powered off, the second switch circuit is conducted, and the uninterrupted power supply supplies power to the metering electric energy meter after being reduced by the transformer.
3. The power supply system of claim 2, wherein the first switching circuit specifically includes three paths of the relays, namely a first relay, a second relay, and a third relay; one ends of the coils of the first relay, the second relay and the third relay are respectively connected with one phase of the electric energy meter power supply, and the other ends of the coils of the first relay, the second relay and the third relay are connected; the normally closed contacts of the first relay, the second relay and the third relay and the first normally closed contact of the first contactor are connected in series and then connected with the second switch circuit; one ends of the normally open contacts of the first relay and the second relay are respectively connected with one end of the coil of the first contactor, and the other ends of the normally open contacts of the first relay and the second relay are respectively connected with one phase of the electric energy meter power supply.
4. The power supply system of claim 3, wherein the first switching circuit further comprises:
a time relay; the coil of the time relay is connected in series with the normally open contact of the third relay and the second normally closed contact of the first contactor, the normally open contact of the time relay is connected in series with the normally open contact of the first relay and the coil of the first contactor, and the normally open contact of the time relay is also connected in parallel with the second normally open contact of the first contactor.
5. The power supply system of claim 4, wherein the second switching circuit comprises:
a second contactor; the coil of the second contactor is connected with the normally closed contacts of the first relay, the second relay and the third relay and the first normally closed contact of the first contactor in series, the normally open contact of the second contactor is connected between the transformer and the metering electric energy meter, and the normally closed contact of the second contactor is connected with the coil of the time relay, the normally open contact of the third relay and the second normally closed contact of the first contactor in series.
6. The power supply system of claim 1, further comprising:
a three-phase air switch; the three-phase air switch is connected between the electric energy meter power supply and the metering electric energy meter.
7. The power supply system of claim 1, further comprising:
a single-phase air switch; the single-phase air switch is connected between the uninterruptible power supply and the metering electric energy meter.
8. A metering device for a photovoltaic power plant, characterized by comprising a metering ammeter and a power supply system for the metering ammeter according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223222193.4U CN219018530U (en) | 2022-12-02 | 2022-12-02 | Power supply system for metering electric energy meter and metering device for photovoltaic power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223222193.4U CN219018530U (en) | 2022-12-02 | 2022-12-02 | Power supply system for metering electric energy meter and metering device for photovoltaic power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219018530U true CN219018530U (en) | 2023-05-12 |
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ID=86248902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223222193.4U Active CN219018530U (en) | 2022-12-02 | 2022-12-02 | Power supply system for metering electric energy meter and metering device for photovoltaic power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219018530U (en) |
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2022
- 2022-12-02 CN CN202223222193.4U patent/CN219018530U/en active Active
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