CN208736931U - A kind of off-grid is let out can type electric energy meter - Google Patents

Abstract

The utility model relates to a kind of electric energy meters.A kind of off-grid let out can type electric energy meter, it includes electric energy meter casing, power module, LCD MODULE, electric energy computation chip, microprocessor；Zero line output end is connected with the zero line output end of electric energy computation chip；It is characterized by: electric energy meter casing is equipped with ground terminal, ground terminal is connected by conducting wire with ground resistance；There is a single-pole double-throw switch (SPDT) in electric energy meter case body, the control terminal of the single-pole double-throw switch (SPDT) is connected with the control port of microprocessor, the input endpoint of single-pole double-throw switch (SPDT) is connected with fire wire output end, the output normal-closed end of single-pole double-throw switch (SPDT) is connected with the fire wire output end of electric energy computation chip, and the output normally open end of single-pole double-throw switch (SPDT) is connected with ground terminal.The electric energy meter has the function of that automatic off-grid lets out energy, the electrical shock safety risk of effective prevention and control low pressure photovoltaic user foldback electricity.

Description

A kind of off-grid is let out can type electric energy meter

Technical field

The utility model relates to a kind of electric energy meter (kilowatt-hour meters).

Background technique

Divide the modular design of family access scheme in state's net fortune [2016] No. 408 texts of inspection about low voltage public grid, it is desirable that Distribution low-voltage side installs a set of anti-isolated island device additional, by realizing the choosing with each low-pressure line-outgoing of low-voltage comprehensive distribution box inside the device Switching and electric blocking function are selected, photo-voltaic power supply anti-power transmission when preventing the maintenance of the area Gong Biantai from constructing.

But according to actual field investigation and daily O&M hidden troubles removing as a result, discovery install anti-isolated island device have with Lower some limitations:

1, according to [2016] No. 408 literary modular designs, to be only used for platform area low for existing anti-isolated island device in power grid at present Press distribution side, low-voltage network can only be prevented to the anti-power transmission of high-voltage fence, and low pressure photovoltaic user Xiang Taiqu low-voltage distribution side and The anti-power transmission of other low-voltage customers can only be controlled by the grid-connected switch (disconnecting link) of user's drawing, can not carry out unified management and Intelligent control.And existing anti-isolated island device price is high, volume is big, installation maintenance require it is high, can not popularization and application given in counnter attack The low pressure photovoltaic power generation user of electricity and the user of self energizing.

2, after the anti-isolated island device of user side puts into operation, power supply enterprise neither has the anti-isolated island appliance arrangement performance of periodic calibration Obligation, user is also without the consciousness of maintenance power grid security.Such equipment is not belonging to the scope of metering whole-life cycle fee, device The shortage of conventional detection work, the case where will lead to failure of apparatus, are difficult to manage in time, the anti-isolated island device of any one user side Once failure, foldback electricity will the safety of personal safety and distribution running equipment to operating personnel damage.

3, wideling popularize with distribution of countries formula photovoltaic anti-poverty project, the low pressure photo-voltaic power supply user of the area Gong Biantai access Quantity be doubled and redoubled year by year, the normal work of anti-isolated island device is particularly important, but the device does not have distant place concentration The function of control.To ensure safety, before carrying out the maintenance construction of the area Gong Biantai, unit-area management person must cooperate field personnel All anti-isolated island devices within the scope of interruption maintenance are operated manually one by one, and then for low capacity distributed photovoltaic power It needs to disconnect air switch from door to door, and carries out correspondingly safety measure.Whole process is not only time-consuming and laborious, increases interruption maintenance The risk of duration and customer complaint, and since locking measure can not effectively be implemented, safety can only be carried out by suspension nameplate Risk control, can not effectively prevention and control low pressure photo-voltaic power supply and the power autonomous foldback electricity of user electrical shock safety risk.

Summary of the invention

The purpose of this utility model is to provide a kind of off-grids to let out energy type electric energy meter, which there is off-grid to let out can function Energy.

In order to realize that the purpose of this utility model, technical solution adopted in the utility model be: a kind of off-grid is let out can type Electric energy meter, it includes electric energy meter casing, power module, LCD MODULE, electric energy computation chip, microprocessor；The power supply Module is connect with the electric energy computation chip, LCD MODULE and microprocessor, and power module is for providing power supply；The electricity Energy metering chip is connect with the microprocessor, and the magnitude of power that electric energy computation chip is measured is transmitted to the micro process Device is handled；The LCD MODULE is connect with the microprocessor, and the data for receiving the microprocessor transmission are gone forward side by side Row display；Power module, LCD MODULE, electric energy computation chip and microprocessor are located in electric energy meter case body, electric energy meter case Body is equipped with firewire input terminal, zero curve input terminal, zero line output end, fire wire output end, firewire input terminal and electric energy computation chip Firewire input terminal be connected, zero curve input terminal is connected with the zero curve input terminal of electric energy computation chip, zero line output end and electric energy meter The zero line output end for measuring chip is connected；

It is characterized by: electric energy meter casing is equipped with ground terminal, ground terminal is connected by conducting wire with ground resistance；Electric energy meter case There is a single-pole double-throw switch (SPDT) in vivo, the control terminal of the single-pole double-throw switch (SPDT) is connected with the control port of microprocessor, single-pole double throw The input endpoint of switch is connected with fire wire output end, and the output normal-closed end of single-pole double-throw switch (SPDT) and the firewire of electric energy computation chip are defeated Outlet is connected, and the output normally open end of single-pole double-throw switch (SPDT) is connected with ground terminal.

The utility model has the beneficial effects that first is that using electric energy meter casing be equipped with ground terminal, ground terminal by conducting wire with connect Ground resistance is connected；There is a single-pole double-throw switch (SPDT) in electric energy meter, which is connected with the control port of microprocessor, microprocessor control It makes switch and jumps conjunction, when needing to let out energy, switch, which is jumped, closes fire wire output end and ground terminal (by the process control of electric energy meter), The dump energy for the user's photo-voltaic power supply being connected with fire wire output end vents (energy of releasing) by ground terminal.The electric energy meter has Automatic off-grid lets out energy function, and photovoltaic power generation user is effectively prevented from source to system and the anti-power transmission of other users, has filled up production The technical safety measures that power separation gets an electric shock to platform area low-voltage distributing line counnter attack power transmission, effective prevention and control low pressure photo-voltaic power supply and use The power autonomous foldback electricity electrical shock safety risk in family.Second is that by the way that anti-isolated island function (i.e. off-grid lets out energy function) built-in intelligence is electric Table can be reduced the investment of current anti-isolated island device and auxiliary material, save system resource.

Detailed description of the invention

Fig. 1 is that the utility model off-grid lets out energy type electric energy meter (after anti-isolated island function built-in intelligence ammeter) low voltage public grid Divide family access scheme electric main wiring diagram.

Fig. 2 is the structural schematic diagram of the utility model.

In figure: 1- firewire input terminal, 2- zero curve input terminal, 3- zero line output end, 4- fire wire output end, 5- ground terminal, 6- Ground resistance, 7- electric energy meter casing, 8- electric energy computation chip.

Specific embodiment

As shown in Figure 1 and Figure 2, a kind of off-grid lets out energy type electric energy meter, it includes electric energy meter casing, power module, liquid crystal display Module, electric energy computation chip, microprocessor；The power module and the electric energy computation chip, LCD MODULE and Wei Chu Device connection is managed, power module is for providing power supply；The electric energy computation chip is connect with the microprocessor, by electrical energy measurement core The magnitude of power that piece measures is transmitted to the microprocessor and is handled；The LCD MODULE and the microprocessor Connection receives the data of the microprocessor transmission and is shown；Power module, LCD MODULE, electric energy computation chip It is located in electric energy meter casing 7 with microprocessor, electric energy meter casing 7 is equipped with firewire input terminal 1, zero curve input terminal 2, zero line output 3, fire wire output end 4 are held, firewire input terminal 1 is connected with the firewire input terminal of electric energy computation chip 8, zero curve input terminal 2 and electric energy The zero curve input terminal of metering chip 8 is connected, and zero line output end 3 is connected with the zero line output end of electric energy computation chip 8；

Electric energy meter casing is equipped with ground terminal 5, and ground terminal 5 is connected by conducting wire with ground resistance 6；Have one in electric energy meter case body Single-pole double-throw switch (SPDT) K, the control terminal of the single-pole double-throw switch (SPDT) are connected (by the program of electric energy meter with the control port of microprocessor Control single-pole double-throw switch (SPDT) from output normally open end, output normal-closed end between jumped), the input endpoint of single-pole double-throw switch (SPDT) with Fire wire output end 4 is connected, and the output normal-closed end of single-pole double-throw switch (SPDT) is connected (i.e. single with the fire wire output end of electric energy computation chip 8 Fire wire output end 4 and the fire wire output end of electric energy computation chip 8 are closed double-pole double throw switch in normal state), single-pole double throw is opened The output normally open end of pass is connected (i.e. fire wire output end 4 and ground terminal 5 are closed, and photo-voltaic power supply energy ground connection vents) with ground terminal 5； Firewire input terminal 1, zero curve input terminal 2 are connected with electric system, zero line output end 3, fire wire output end 4 and photovoltaic user (photovoltaic Power supply) it is connected.

When distributed photovoltaic power normal power generation, system power grid has a power failure suddenly, and the dump energy of photo-voltaic power supply is needed to let out Fall.The utility model realizes photo-voltaic power supply dump energy of releasing by the conversion closure of single-pole double-throw switch (SPDT) K.

Power module described in the utility model, LCD MODULE, electric energy computation chip, microprocessor can be used existing Technology.It is control circuit (prior art can also be used) that electric energy computation chip, microprocessor are also combinable.

First is that by by anti-isolated island function (i.e. off-grid lets out energy function) built-in intelligence ammeter, so that existing anti-isolated island device It is moved forward to from user's property right separation kilowatt-hour meter from distribution transformer low-pressure line-outgoing side, is having for low voltage electric network counnter attack power transmission electric shock Imitate technical safety measures, at the same can the anti-isolated island function of remote control switching, can effective identification switch state, grasp photovoltaic in real time Power grid state.

The subprogram that wherein anti-isolated island function executes specifically includes that quality of voltage detection, and (inlet-outlet line voltage determination, whether there is or not electricity Pressure judgement), grid-connected dot frequency determined, determined based on the built-in forward and reverse power of intelligent electric meter and the judgement of switch state.

Centralized remote control power-off is carried out to photovoltaic user by acquisition system before maintenance.It is two-way due to being disconnected in advance when maintenance The grid-connected switch in the inside of electricity-measuring meter, can preferably prevent photo-voltaic power supply user accidentally close air switch and caused by misdeliver electricity. After maintenance completion, increase to photovoltaic user progress checkout voltage judgement, realizes that photovoltaic user is single or batch all supplies, powers off function Can, to guarantee that power distribution station low-voltage customer will not be because of wherein a certain family or more family photovoltaic plant anti-islanding disablers to electricity Net foldback is electric and influences the safe and reliable power supply of the same other users in area.

Second is that metering whole-life cycle fee system is made full use of to solve the problems, such as no O&M.Integrate the electricity of anti-isolated island function The meter assets that table is still within the scope of metering whole-life cycle fee can be by anti-isolated island for the meter of photo-voltaic power supply user The detection of function is included in meter calibrating project, it is ensured that the anti-isolated island function of the operation meter for distributed photovoltaic power user It is effectively controllable, the electrical shock safety risk of low pressure photovoltaic user foldback electricity when reducing the area Gong Biantai interruption maintenance conscientiously.

Claims (1)

1. a kind of off-grid lets out energy type electric energy meter, it includes electric energy meter casing, power module, LCD MODULE, electrical energy measurement core Piece, microprocessor；The power module is connect with the electric energy computation chip, LCD MODULE and microprocessor, power supply mould Block is for providing power supply；The electric energy computation chip is connect with the microprocessor, the function that electric energy computation chip is measured Rate score is transmitted to the microprocessor and is handled；The LCD MODULE is connect with the microprocessor, described in reception The data of microprocessor transmission are simultaneously shown；Power module, LCD MODULE, electric energy computation chip and microprocessor are located at In electric energy meter casing (7), electric energy meter casing (7) be equipped with firewire input terminal (1), zero curve input terminal (2), zero line output end (3), Fire wire output end (4), firewire input terminal (1) are connected with the firewire input terminal of electric energy computation chip (8), zero curve input terminal (2) with The zero curve input terminal of electric energy computation chip (8) is connected, the zero line output end phase of zero line output end (3) and electric energy computation chip (8) Even；

It is characterized by: electric energy meter casing is equipped with ground terminal (5), ground terminal (5) is connected by conducting wire with ground resistance (6)；Electricity There can be a single-pole double-throw switch (SPDT) (K) in watch shell, the control terminal of the single-pole double-throw switch (SPDT) is connected with the control port of microprocessor, The input endpoint of single-pole double-throw switch (SPDT) is connected with fire wire output end (4), the output normal-closed end and electrical energy measurement of single-pole double-throw switch (SPDT) The fire wire output end of chip (8) is connected, and the output normally open end of single-pole double-throw switch (SPDT) is connected with ground terminal (5).