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pv power station arc monitoring

under the background of carbon peaking and carbon neutralization, in-depth analysis of the current environment and situation of energy development shows that the global energy system is undergoing profound changes: comprehensively accelerating the transformation of energy; new pattern of energy and industrial system; accelerate green and low-carbon development; the level of informatization and intelligence of energy industry has been continuously improved; energy production is gradually changing to both centralized and decentralized; energy development shows a clear trend of low-carbon, intelligent, diversified and multipolar.

at the same time, china is entering a new stage of building a modern energy system, which is mainly reflected in the "four phases": energy security has entered a critical period; the low-carbon transformation of energy has entered an important window period; the modern energy industry has entered a period of innovation and upgrading; universal energy services entered a period of consolidation and improvement.

for energy security, it is necessary to mention the photovoltaic dc arc fault that has been paid more and more attention in recent years. with the rapid development of photovoltaic power generation, fire accidents in photovoltaic systems occur from time to time, most of which are related to fault arcs. there are a large number of connecting equipment between photovoltaic modules. once the insulation layer is aged and fails, hundreds of volts of dc voltage can break through the air and generate an arc. dc arc does not have zero crossing point, so it is not easy to extinguish the arc. if it is not protected in time, long-term arcing may occur. when it occurs, sparks and bright lights can produce high temperatures above 1000 ℃, which can further damage the insulation of wires and cables, and even cause electrical fires. in addition, the fault arc can also make the device live, threatening the safety of operators. noa, as a professional and authoritative comprehensive third-party inspection, detection and certification institution, provides online monitoring services for dc arc fault of photovoltaic array. by detecting the characteristic quantity of arc fault of line current, it analyzes the potential risk level of power station arc and effectively prevents potential safety hazards caused by power station arc fault.

service content

noa photovoltaic power station dc arc fault monitoring service refers to the relevant requirements of ul1699b, mainly including:

1. install the photovoltaic string arc monitor at the power station site

2. analyze whether there is dc arcing in the string cables of the photovoltaic power station in operation

3. analyze the data and assess its risk level

service process

q&a

the photovoltaic power station system is composed of photovoltaic modules, inverters, combiner boxes, brackets and other components. if a problem occurs in one of the links, it will affect the operation of the power station, resulting in a loss of power generation, and a fire in severe cases.

1. what is the cause of the dc arc fault?

the arc fault is caused by the aging of the insulation performance of the wire and cable, the insulation damage, the moisture in the air, and the loose connection terminals. as the operating time of the power station increases, the probability of occurrence of dc arcs also increases.

2. what is the time domain characteristic quantity of dc arc fault?

at present, the online detection of dc arc faults is generally realized by detecting the arc fault characteristic quantities of the line current. the common dc arc fault characteristic quantities can be divided into time domain characteristics and frequency domain characteristics.

3. what is the difference between a dc arc and an ac arc?

the ac arc current is periodic, and there is a "zero rest zone" when it crosses zero; while the dc arc has no periodicity, there is no concept of fundamental wave, and it has strong randomness and non-stationarity. therefore, the characteristic criterion of ac arc fault detection is not suitable for the detection of dc arc fault.

4. what are the hazards of dc arc faults?

when a dc arc fault occurs, it is accompanied by sparks and bright light, which can generate a high temperature of more than 1000 ° c, resulting in further damage to the insulation of the wire and cable, and even cause an electrical fire. especially in the context of the country's vigorous promotion of rooftop distributed photovoltaics, more attention should be paid to the safety of personnel and property that may be caused by arc faults.

our advantage

authoritative qualification

noa has been approved by certification and accreditation administration of the people’s republic of china（cnca）(cnca-r-2002-051), and has obtained qualification of china inspection body and laboratory mandatory approval (cma),and has passed the multiple approvals of china national accreditation service for conformity assessment (cnas), international accreditation service (ias), united kingdom accreditation service (ukas), joint accreditation system of australia and new zealand (jas-anz). noa has been approved by state administration for market regulation of china, and has been recognized as inspection and testing institution of china's special equipment, as well as the qualification of china's national equipment supervision and engineering supervision. noa-dci is the notified body of the ce directive of the european commission. noa has been recognized by the international electrotechnical commission (iecq) by obtaining electronic component quality assessment system. it is also a national inspection and assessment notified body of import and export commodity in china.noa is a high-tech enterprise in shanghai.

improve performance, realize asset value appreciation, and service throughout the entire value chain

from pre-design to post-operation, noa has the ability to guarantee the whole life cycle of the business. noa, as an independent third-party inspection company, has a large number of domestic and international standards and specifications proficient in design, welding, non-destructive testing, painting, packaging and other fields the experienced team of professional engineers and inspection experts, with more than ten years of experience in the domestic market, is familiar with all aspects of the domestic industrial equipment supply chain, and can provide you with technical support services for the full life cycle of technical services in a timely manner, combining various products. inspection, certification, testing, consulting, and auditing services can provide you with one-stop all-round comprehensive services.

quality, efficiency and service

noa has formed a mature and solid operation system in the development of more than 20 years. we let technical experts who are familiar with market regulations and testing standards and have professional industry experience to carry out inspection, evaluation and design review work. while meeting the requirements of domestic and international standards, we ensure that customers can obtain satisfactory service results in the first time with accurate time-sensitive management methods, and ensure that customers can seize the opportunity in the market competition.

service area

noa inspection services currently cover europe, australia, russia, some middle east regions and most regions in china. noa can ensure the consistency and continuity of customer service in different regions, and eliminate the impact of unfamiliar environments on customer quality. the guarantees and the impact of project implementation enable customers to participate in different markets across the country or around the world with flawless quality.

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