光伏逆变器防雷保护

system protection

C o m p l e t e s u r g e s u p p r e s s i o n r a n g e f o r p h o t o v o l t a i c s y s t e m s

Typical examples of installation

II. Installation of solar photovoltaic array on green field with individual inverters at panels

An inverter is installed for each photovoltaic array at the photovoltaic panels. Each inverter shall be protected by the SLP-500 PH V/2 or SLP-1000 PH V/3 1 protectors (selected according to the photovoltaic open-circuit voltage) on the DC side. It is sufficient to install the FLP-275 V 4 protectors (for phase voltage of 230 V AC) in the TN system.

The FLP-B+C MAXI 3 protector shall be used as a low voltage protector in the shelter or container. It is similar for signal and telecommunication lines as in case I. On top of that, protection of communication with inverters (using, for example, RS-485) – e.g. the BDM-06 9

protector, shall be provided. At the same time, the cable loop size shall be minimized.

1

I. Installation of solar photovoltaic array on green field with central inverter

Individual photovoltaic arrays are connected in the junction box of a photovoltaic source and led to the inverter using a main cable (to a shelter, container…). DC overvoltage protectors (SPD) 1 are installed in close proximity to the inverter. If the length of the cable from the inverter to the junction box exceeds 25 m, we recommend installing the same surge protector 1 in the junction box of the photovoltaic source. SLP-500 PH V/2 or SLP-1000 PH V/3 protectors (selected

according to the open-circuit voltage of the photovoltaic source) for this type of solar photovoltaic systems are installed. When you assemble the cables, make sure you minimise the size of the cable loops. It is sufficient to install the FLP-B+C MAXI 3 protector on the AC side. At the same time, signal lines shall be protected (measurement of wind speed – e.g. BDM-24 7 protector, measurement of the ambient temperature – e.g. DM-024/1 R DJ 8 protector, or measurement of the panel temperature – e.g. BDM-24 7 protector) as well as telecommunication lines – e.g. the FAX-OVERDRIVE F16 6 socket adaptor.

3

1

7

8

7

6

≥ 25 m

13

4

7876

1

49

t e le f o n

n í li n k a

T N 230

/400 V A C

t e le f o n

n í li n k a

T N 230

/400 V A C

9

9

III. Installation of solar photovoltaic array on rooftops complying with sufficient separation distance from lightning protection system

Damage to photovoltaic systems is minimised if a sufficient (separation) distance between the lightning conductor

system and the photovoltaic panels is maintained. The inverter is protected by the SLP-500 PH V/2 or SLP-1000 PH V/3 1 protectors on the DC side, and the SLP-275 V 5 or FLP-B+C MAXI 3 protectors on the AC side. It is desirable to lay cables

directly from the photovoltaic arrays (panels) to the inverter, if possible.

1

5

3

≥ s

≥ s

≥ s

≥ s

T N 230/400 V

A C