CN204349260U

CN204349260U - A kind of photovoltaic metering cabinet

Info

Publication number: CN204349260U
Application number: CN201520070204.2U
Authority: CN
Inventors: 李延泉; 李小龙; 李俊洋
Original assignee: XIAMEN DONGGANG INTELLIGENT TECHNOLOGY Co Ltd
Current assignee: XIAMEN DONGGANG INTELLIGENT TECHNOLOGY Co Ltd
Priority date: 2015-02-02
Filing date: 2015-02-02
Publication date: 2015-05-20
Anticipated expiration: 2025-02-02

Abstract

The utility model relates to a kind of photovoltaic metering cabinet, for photovoltaic generation electric energy metrical, comprise a cabinet, current transformer, voltage transformer and metering ammeter is comprised in described cabinet, the direct current energy that photovoltaic array outside cabinet sends is sent in photovoltaic DC-to-AC converter and is transformed into alternating current, alternating current accesses metering ammeter after flowing into current transformer in described cabinet and voltage transformer, is measured the electric flux sending into electrical network by metering ammeter, the output access grid-connected side of civil power of affiliated metering ammeter.Tool has the following advantages: the voltage and current signal received is carried out sampling and calculates by metering ammeter, accurate measurement can go out the energy output of photovoltaic array; Adopt voltage transformer summation current transformer, the photovoltaic power generation equipment making this photovoltaic metering cabinet can be used for current value to be greater than 60A, more than installed capacity 50KW; Overall structure is simple, and easy and simple to handle, be easy to installation and maintenance, reliability is high, accurate measurement.

Description

A kind of photovoltaic metering cabinet

Technical field

The utility model belongs to electric energy metrical field, particularly relates to a kind of photovoltaic metering cabinet.

Background technology

Along with the development of human industry, worsen in global warming, human ecological environment, conventional energy resource shortage of resources under causing the situation of environmental pollution, the utilization of fossil energy constantly brings the pressure of each side to environment, solar photovoltaic technology generally obtains attention and the support of national governments.Countries in the world accelerate the exploitation to cleaning new energy, and solar energy, because having the clean feature such as harmless, widely distributed, is more and more subject to the favor of people.Photovoltaic also becomes the focus of current distributed new generating.

Along with the news speed development of photovoltaic industry, oneself solar photo-voltaic power generation station has all been loaded onto in increasing resident, enterprise, school, market etc., and the metering of the energy output of photovoltaic just becomes an emphasis difficult problem.Especially National Development and Reform Committee draw up the electrovalence policy determining encouragement photovoltaic generation when, at present, also do not have a set of corresponding system or equipment to detect it.

Utility model content

The utility model solves problems of the prior art, provides a kind of photovoltaic metering cabinet, makes the metering of photovoltaic generation more accurately and specification, have safety and reliability.

For reaching above-mentioned purpose, the technical solution of the utility model is: a kind of photovoltaic metering cabinet, for photovoltaic generation electric energy metrical, comprise a cabinet, current transformer, voltage transformer and metering ammeter is comprised in described cabinet, the direct current energy that photovoltaic array outside cabinet sends is sent in photovoltaic DC-to-AC converter and is transformed into alternating current, alternating current accesses metering ammeter after flowing into current transformer in described cabinet and voltage transformer, the electricity sending into electrical network is measured, the output access grid-connected side of civil power of affiliated metering ammeter by metering ammeter.

Preferably, described cabinet at least one photovoltaic DC-to-AC converter external, accesses the AC circuit breaker of a protective circuit after the output of each photovoltaic DC-to-AC converter, an access AC circuit breaker and alternating-current lightning arrestor before the input of the grid-connected side of described civil power.

Preferably, described cabinet is provided with 3 transparent observation windows, is respectively metering ammeter observation window, current transformer and voltage transformer observation window, magnitude of voltage and current value observation window.

Preferably, described photovoltaic DC-to-AC converter is 2.

The technical program, its tool has the following advantages: the voltage and current signal received is carried out sampling and calculates by metering ammeter, accurate measurement can go out the energy output of photovoltaic array; Adopt voltage transformer summation current transformer, the photovoltaic power generation equipment making this photovoltaic metering cabinet can be used for current value to be greater than 60A, more than installed capacity 50KW; By arranging observation window, whether staff can observe current electricity generation system and stablize, and judges whether system has fault; AC circuit breaker and alternating-current lightning arrestor are set, improve safety and reliability; Photovoltaic DC-to-AC converter is arranged on the outside of cabinet, make overall structure simple, compact, easy and simple to handle, be easy to installation and maintenance, reliability is high, accurate measurement.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.

Fig. 1 is the electrical schematic diagram of specific embodiment of the utility model;

Fig. 2 is the cabinet front view of specific embodiment of the utility model;

Fig. 3 is the cabinet rearview of specific embodiment of the utility model;

Reference numeral: 1, photovoltaic DC-to-AC converter A; 2, photovoltaic DC-to-AC converter B; 3, AC circuit breaker 1QF; 4, AC circuit breaker 2QF; 5, current transformer; 6, voltage transformer; 7, alternating-current lightning arrestor; 8, special measuring ammeter; 9, AC circuit breaker 3QF; 10, the grid-connected side of civil power; 11, cabinet; 12, current transformer and voltage transformer observation window; 13, metering ammeter observation window; 14, magnitude of voltage and current value observation window.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described further.

A kind of photovoltaic metering cabinet, for photovoltaic generation electric energy metrical, comprise a cabinet, current transformer, voltage transformer and metering ammeter is comprised in described cabinet, the direct current energy that photovoltaic array outside cabinet sends is sent in photovoltaic DC-to-AC converter and is transformed into alternating current, alternating current accesses metering ammeter after flowing into current transformer in described cabinet and voltage transformer, is measured the electric flux sending into electrical network by metering ammeter, the output access grid-connected side of civil power of metering ammeter.

As Figure 1-3, the present embodiment for external 2 photovoltaic DC-to-AC converters of cabinet, and accesses the AC circuit breaker of a protective circuit after the output of each photovoltaic DC-to-AC converter, an access AC circuit breaker and alternating-current lightning arrestor before the input of the grid-connected side of civil power.As shown in Figures 2 and 3, cabinet 11 is provided with 3 transparent observation windows, be respectively metering ammeter observation window 13, current transformer and voltage transformer observation window 12, magnitude of voltage and current value observation window 14, magnitude of voltage and current value observation window 14 are respectively equipped with a voltmeter and 3 ammeters are connected in circuit, for the current voltage measured and three-phase current, facilitate staff to observe, whether understanding system normally works, and whether each equipment is stable.

Its operation principle is: the direct current that photovoltaic array sends is sent in photovoltaic DC-to-AC converter A1 and photovoltaic DC-to-AC converter B2 respectively, alternating current after inversion confluxes respectively through after AC circuit breaker 1QF 3 and AC circuit breaker 2QF 4 by photovoltaic DC-to-AC converter A1 and photovoltaic DC-to-AC converter B2, and access in current transformer 5 and voltage transformer 6, voltage transformer 6 summation current transformer 5 can measure current voltage and three-phase current respectively, carries out energy output metering by voltage transformer 6 alternating current out in the metering ammeter 8 that power supply administration is special; The grid-connected side 10 of civil power is incorporated to through AC circuit breaker 3QF9 by metering ammeter 8 electric current out.The current voltage that mutual inductor measuring measures and three-phase electricity flow valuve, can observe from magnitude of voltage and current value observation window 14 and obtain.Connect an alternating-current lightning arrestor 7 at the ac output end of voltage transformer 6, lightning surge attack can be exempted from by proterctive equipment.

Although specifically show in conjunction with preferred embodiment and describe the utility model; but those skilled in the art should be understood that; not departing from the spirit and scope of the present utility model that appended claims limits; in the form and details the utility model is made a variety of changes, be protection range of the present utility model.

Claims

1. a photovoltaic metering cabinet, for photovoltaic generation electric energy metrical, it is characterized in that, comprise a cabinet, comprise current transformer, voltage transformer and metering ammeter in described cabinet, direct current energy that the photovoltaic array outside cabinet sends is sent in photovoltaic DC-to-AC converter and is transformed into alternating current, and alternating current accesses metering ammeter after flowing into current transformer in described cabinet and voltage transformer, the electric flux sending into electrical network is measured, the output access grid-connected side of civil power of affiliated metering ammeter by metering ammeter.

2. a kind of photovoltaic metering cabinet as claimed in claim 1; it is characterized in that; described cabinet at least one photovoltaic DC-to-AC converter external; the AC circuit breaker of a protective circuit is accessed, an access AC circuit breaker and alternating-current lightning arrestor before the input of the grid-connected side of described civil power after the output of each photovoltaic DC-to-AC converter.

3. a kind of photovoltaic metering cabinet as claimed in claim 1, is characterized in that, described cabinet is provided with 3 transparent observation windows, is respectively metering ammeter observation window, current transformer and voltage transformer observation window, magnitude of voltage and current value observation window.

4. a kind of photovoltaic metering cabinet as claimed in claim 2, is characterized in that, described photovoltaic DC-to-AC converter is 2.