CN206211332U - A kind of special electrical energy metering tank of distributed photovoltaic power generation - Google Patents

Abstract

The utility model is related to a kind of special electrical energy metering tank of distributed photovoltaic power generation, belongs to electrical equipment technical field.Technical scheme is：Comprising mains supply（1）, civil power ammeter（2）, disconnecting switch（3）, customer charge（4）, power generating source（5）, generating ammeter（6）, Surge Protector（7）, contactor（8）With the overvoltage/undervoltage delay-time protector that automatically resets（9）, the mains supply（1）, civil power ammeter（2）, disconnecting switch（3）It is sequentially connected composition grid transmission device, power generating source（5）, generating ammeter（6）, contactor（8）, automatically reset overvoltage/undervoltage delay-time protector（9）Composition photovoltaic power generation apparatus are sequentially connected, grid transmission device is interconnected after end is grid-connected with photovoltaic power generation apparatus with customer charge, and power generating source passes through Surge Protector（7）Ground connection.The utility model makes distribution type photovoltaic power generation device electric energy metrical control device economic and practical, safe and reliable, easily by customer acceptance.

Description

A special electric energy metering box for distributed photovoltaic power generation

technical field

The utility model relates to a special electric energy metering box for distributed photovoltaic power generation, which belongs to the technical field of electric power equipment.

Background technique

With the progress of the times, air pollution is becoming more and more serious, and the use of clean energy is increasingly valued by organizations at all levels of the international community. As a clean energy, solar energy is economical, environmentally friendly and easy to obtain, and it is very easy to obtain national preferential industrial policy support. With the research and development of solar photovoltaic power generation, grid-connected photovoltaic power generation has begun to be popularized and applied on a large scale in my country. Photovoltaic power generation projects are favored by more and more ordinary families because of their simple installation, small investment, stable returns, and relatively high safety. The installation trend will increase year by year. The unified standardization, safety, specifications and models of the electric energy measurement and control equipment of the device are uneven, and the standards are not uniform. There are certain defects in grid connection security, grid pollution, cost control, anti-theft, operation management and many other aspects.

Utility model content

The purpose of the utility model is to provide a special electric energy metering box for distributed photovoltaic power generation. By adopting supporting devices such as isolating switches, surge protectors, and overvoltage and undervoltage protection devices, the electric energy metering control equipment for distributed photovoltaic power generation devices is economical, applicable and safe. Reliably and effectively solve the above-mentioned problems in the background technology.

The technical solution of the utility model is: a special electric energy metering box for distributed photovoltaic power generation, including mains power supply, mains electricity meter, isolating switch, user load, power generation power supply, power generation meter, surge protector, contactor and automatic reset Over-voltage and under-voltage delay protector, the mains power supply, mains power meter, and isolating switch are connected in sequence to form a grid power transmission device, and the power generation power supply, power generation meter, contactor, and automatic reset over-voltage and under-voltage time-delay protector are connected in sequence to form a photovoltaic power generation device , the grid power transmission device and the photovoltaic power generation device are connected to the user load after the terminal is connected to the grid. At the grid connection, the coil power supply of the contactor is connected to the grid side.

The mains power supply and power generation power supply are single-phase power supplies. There is an overcurrent leakage protection between the grid power transmission device and the photovoltaic power generation device grid connection point and the user load. device.

The mains power supply and the power generation power supply are three-phase power supplies. There is a three-phase overcurrent leakage protection between the grid power transmission device and the photovoltaic power generation device grid connection point and the user load, and a three-phase overcurrent protection device between the power generation power supply and the power generation meter. breaker.

A warning sign is also provided at the isolating switch at the incoming line end of the power grid.

The mains electricity meter and the electricity generation meter are provided with a lead sealing device, a plexiglass transparent window and an operation hole.

The beneficial effects of the utility model are: by adopting supporting devices such as isolating switches, surge protectors, overvoltage and undervoltage protection devices, the electric energy measurement and control equipment of the distributed photovoltaic power generation device is economical, applicable, safe and reliable, and is easily recognized by users.

Description of drawings

Fig. 1 is the operating principle diagram of the single-phase power supply for the mains power supply and the power generation power supply of the utility model;

Fig. 2 is a working principle diagram of a three-phase power supply for the mains power supply and the power generation power supply of the utility model;

In the figure: mains power supply 1, mains meter 2, isolating switch 3, user load 4, generator power supply 5, generator meter 6, surge protector 7, contactor 8, automatic reset overvoltage and undervoltage delay protector 9, belt Overcurrent leakage protection 101, three-phase overcurrent leakage protection 102, overcurrent circuit breaker 111, three-phase overcurrent circuit breaker 112.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

A special electric energy metering box for distributed photovoltaic power generation, including a mains power supply 1, a mains electricity meter 2, an isolating switch 3, a user load 4, a power generation power supply 5, a power generation meter 6, a surge protector 7, a contactor 8 and an automatic reset Over-voltage and under-voltage delay protector 9, the mains power supply 1, mains power meter 2, and isolating switch 3 are connected in sequence to form a grid power transmission device, power generation power supply 5, power generation meter 6, contactor 8, automatic reset over-voltage and under-voltage delay protection The devices 9 are sequentially connected to form a photovoltaic power generation device. The grid power transmission device and the photovoltaic power generation device are connected to the user load 4 after the terminal is connected to the grid. The power generation power supply 5 is grounded through the surge protector 7. The protector 9 is arranged at the grid connection between the grid power transmission device and the photovoltaic power generation device, and the coil power supply of the contactor 8 is connected to the grid side.

The mains power supply 1 and the power generation power supply 5 are single-phase power supplies. An overcurrent leakage protector 101 is provided between the grid power transmission device and the photovoltaic power generation device grid connection point and the user load 4. The first and last ends of the photovoltaic power generation device are respectively provided with With overcurrent circuit breaker 111.

The mains power supply 1 and the power generation power supply 5 are three-phase power supplies. A three-phase overcurrent leakage protector 102 is provided between the grid power transmission device and the photovoltaic power generation device grid connection point and the user load 4, and a power supply 5 and a power generation meter 6 are provided with a three-phase power supply. A three-phase belt overcurrent circuit breaker 112 is provided.

A warning sign is also provided at the isolating switch 3 of the grid inlet terminal.

The mains electricity meter 2 and the power generation meter 6 are provided with a lead sealing device, a plexiglass transparent window and an operation hole.

In practical application, the special function of the present utility model is as follows:

(1) Although the selected inverter conforms to the national standard, in order to be more secure and prevent reverse power transmission due to inverter failure, an isolating switch is added at the incoming line end of the power grid. Open the isolating switch, so that the device has an obvious disconnection point from the power grid, and hang a warning sign with red letters on a white background that says "someone is working on the line, it is forbidden to close the switch". Gate power transmission, in the state of system power failure, the physical power failure and the inverter itself stop running "double insurance".

(2) In order to prevent the high-order harmonic voltage generated by the device from polluting the power grid, a surge protector is installed. Once the power generation system generates high-order harmonic voltage, the surge protector operates to release the pollution source into the ground to prevent Pollution to the grid.

(3) Over and under voltage protection function.

When the power grid fails and the power is cut off, if the professional management personnel do not disconnect the isolating switch in time, in order to prevent the inverter from failing and continue to generate electricity, the utility model adds an AC contactor and An automatic reset over-voltage and under-voltage time-delay protector. The power supply of the contactor coil is connected to the power grid side. The working principle is as follows:

1. Under normal conditions (planned power outage, inverter without failure), the contactor and the automatic reset overvoltage and undervoltage delay protector 9 are disconnected to isolate the photovoltaic power generation device from the power grid. When the power grid comes in, the contactor and Automatic reset The overvoltage and undervoltage time-delay protector 9 automatically resets.

2. Under abnormal conditions (grid failure and power failure, and inverter failure island protector device failure), the photovoltaic power generation device continues to generate power and supplies power to the power grid. When the fault occurs, the photovoltaic power generation device supplies power to the power grid. The capacity of the photovoltaic power generation device is very small, and the load of the grid user is much greater than its power generation capacity, so that the grid voltage drops, and the contactor coil voltage is lower than 70% of the rated voltage and released, which separates the photovoltaic power generation device from the grid to ensure safety.

(4) In order to facilitate cost control, a shunt release (specially used for three-phase power generators) is added.

(5) For the convenience of management and safety, divide measurement and control into two functional areas. The metering function is divided into two parts: grid metering and photovoltaic power generation device metering. The control function is divided into two parts: the power grid and the photovoltaic power generation device.

(6) Single-phase distributed photovoltaic power generation devices are suitable for residential users.

The three-phase distributed photovoltaic power generation device is suitable for three-phase users.

(7) In order to prevent electricity theft, a lead seal device shall be made in the metering functional area.

(8) In order to facilitate management and user use, the metering area adopts plexiglass transparent windows, and holes are opened in appropriate positions, which is convenient for management, browsing, and call-back operations.

(9) The protection level of the utility model reaches IP30.

The utility model is suitable for distributed photovoltaic power generation grid-connected systems with AC 50Hz, voltage 380V three-phase (8-30kW), and 220V single-phase (below 8kW).

Conditions of use are:

1. The altitude is less than or equal to 2 kilometers.

2. Ambient temperature: minus 55 degrees Celsius to minus 55 degrees Celsius.

3. The maximum daily temperature difference: 45 degrees Celsius.

4. The relative humidity is less than or equal to 95% (at 25 degrees Celsius).

5. Sunshine intensity: 0.1w per square centimeter (when the wind speed is 5m/s).

6. The maximum wind speed is less than or equal to 35 meters per hour.

7. Icing thickness (outdoor type): 10mm.

8. Pollution level: Level 4.

9. Earthquake intensity: Level 8.

Claims (5)

1. An electric energy metering box dedicated to distributed photovoltaic power generation, characterized in that it includes a mains power supply (1), a mains electricity meter (2), an isolating switch (3), a user load (4), a power generation power supply (5), Generator ammeter (6), surge protector (7), contactor (8) and automatic reset over-voltage and undervoltage delay protector (9), the mains power supply (1), mains ammeter (2), isolating switch (3) Connect sequentially to form a grid power transmission device, power generation power supply (5), power generation meter (6), contactor (8), automatic reset overvoltage and undervoltage delay protector (9) are connected in sequence to form a photovoltaic power generation device, and grid power transmission The device and the photovoltaic power generation device are connected to the user load (4) after being connected to the grid at the end, the power generation power (5) is grounded through the surge protector (7), the contactor (8), and the automatic reset overvoltage and undervoltage delay protector (9) ) is arranged at the grid-connected connection between the grid power transmission device and the photovoltaic power generation device, and the coil power supply of the contactor (8) is connected to the grid side. 2. A special electric energy metering box for distributed photovoltaic power generation according to claim 1, characterized in that: the mains power supply (1) and the power generation power supply (5) are single-phase power supplies, and the grid power transmission device and photovoltaic power generation An overcurrent leakage protector (101) is provided between the grid connection point of the device and the user load (4), and an overcurrent circuit breaker (111) is provided at both ends of the photovoltaic power generation device. 3. A special electric energy metering box for distributed photovoltaic power generation according to claim 1, characterized in that: the mains power supply (1) and the power generation power supply (5) are three-phase power supplies, and the grid power transmission device and photovoltaic power generation A three-phase overcurrent leakage protector (102) is provided between the grid connection point of the device and the user load (4), and a three-phase overcurrent circuit breaker (112) is provided between the power generation source (5) and the power generation meter (6). 4. A dedicated electric energy metering box for distributed photovoltaic power generation according to claim 1, characterized in that: a warning sign is also provided at the isolating switch (3) at the grid inlet terminal. 5. A special electric energy metering box for distributed photovoltaic power generation according to claim 1, characterized in that: said mains electricity meter (2) and power generation meter (6) are equipped with lead sealing device, plexiglass transparent window and operation hole.