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4  Power-Generating Unit Protection Test

SMA Solar Technology AG

Service Manual for Installers

SC-UP_SCS-UP_EZE-SG-en-10

14

4

Power-Generating Unit Protection Test

The power-generating unit protection test is a fundamental part of PV system certification. For existing systems the
protection test is part of the certificate, for new systems it is part of the declaration of conformity. The power-generating
unit protection test helps grid operators and the certifying body to understand the proper parameterization and
function of the protection concept. To this end, the test procedure must be documented completely. The
parameterization specifications and the accuracy class requirements can be found in the grid connection guidelines or
are specified by the grid operator.

4.1

Safety during the Power-Generating Unit Protection Test

DANGER

Danger to life from electric shock due to live voltage

High voltages are present in the live components of the product. Touching live components results in death or
serious injury due to electric shock.

• Wear suitable personal protective equipment for all work on the product.

• Do not touch any live components.

• Observe all warning messages on the product and in the documentation.

• Observe all safety information of the module manufacturer.

• After switching off the inverter, wait at least 25 minutes before opening it to allow the capacitors to discharge

completely (see Section 3.1, page 11).

4.2

Calculating the Reference Voltage

Contractually agreed voltage V

C

 corresponds to parameter VolRtg

The contractually agreed voltage at the grid feed-in point V

C

 corresponds to the parameter 

VolRtg

. V

C

 – the

voltage contractually agreed on with the electric utility company – must be entered for the parameter 

VolRtg

during commissioning and calculation of the reference voltage.

An appropriate reference voltage must be selected for the testing device when performing the protection test. The
reference voltage can be calculated using the following formula.

Formula Symbol

Unit

Explanation

V

0

V

Reference voltage of testing device

V

C

V

Voltage at the grid feed-in point, contractually agreed with the grid op-
erator

i

-

Transmission ratio of the MV transformer. The transmission ratio is the
ratio of 

TrfVolExLo

 to 

TrfVolExHi

.

VolRtg*

V

Nominal line voltage of the utility grid (parameter)

TrfVolExLo**

V

Voltage on the low-voltage side of the external transformer (parameter)

Summary of Contents for SC 4000 UP

Page 1: ...MA SUNNY CENTRAL UP SC UP_SCS UP_EZE SG en 10 Version 1 0 ENGLISH Service Manual for Installers Test Instructions for the Power Generating Unit Protection Test SUNNY CENTRAL UP SUNNY CENTRAL STORAGE U...

Page 2: ...damages under any circumstances The exclusion of implied warranties may not apply in all cases under some statutes and thus the above exclusion may not apply Specifications are subject to change with...

Page 3: ...tion 5 2 Safety 6 2 1 IMPORTANT SAFETY INSTRUCTIONS 6 2 2 Personal Protective Equipment 9 3 Disconnecting and Reconnecting 11 3 1 Disconnecting the Inverter 11 3 2 Disconnecting the Medium Voltage Tra...

Page 4: ...lified persons Qualified persons must have the following skills Knowledge of how the product works and is operated Training in how to deal with the dangers and risks associated with installing repairi...

Page 5: ...10 in the field Minutes Connects several elements to be selected Select Settings Date Button Key Button or key to be selected or pressed Select Enter Placeholder for variable components e g parameter...

Page 6: ...verter wait at least 25 minutes before opening the inverter to allow the capacitors to discharge completely Wear suitable personal protective equipment of the corresponding hazard risk category for al...

Page 7: ...closed electrical operating area WARNING Danger to life from electric shock when entering the PV power plant Lethal ground currents due to damaged insulations of the PV field Lethal electric shocks ca...

Page 8: ...th or serious injury due to electric shock Disconnect the external supply voltage Do not touch the orange cables in the inside of the product These cables are used for connecting the external supply v...

Page 9: ...e disconnected from voltage sources perform a thorough 24 month maintenance check that is not subject to the maintenance schedule After a dust or snow storm ensure that the air inlets and outlets are...

Page 10: ...foration proof soles and steel toe caps Tight fitting work clothes made of 100 cotton Suitable work pants Proper hearing protection Safety gloves Proper head protection Any other prescribed protective...

Page 11: ...of PV voltage present DC to PE 10 of PV voltage present DC to PE 0 V Additionally required material not included in the scope of delivery 2 padlocks Diameter of the shackle 5 mm to 8 mm Procedure 1 O...

Page 12: ...9 Measure the DC voltage at the terminal X251 Measure DC against DC and both poles against the grounding conductor The DC voltage must be 0 V 20 Open the hatch on the DC side of the inverter Opening a...

Page 13: ...and the Do not operate magnetic sign varistor 3 Remove the padlock from the circuit breaker for the MV switchgear 4 Open the grounding switch at the transformer panel of the MV switchgear 5 Close the...

Page 14: ...work on the product Do not touch any live components Observe all warning messages on the product and in the documentation Observe all safety information of the module manufacturer After switching off...

Page 15: ...ers Set value disconnection time Voltage increase protection 1st level V tV VCtl Hi1Lim VCtl Hi1LimTm 2nd level V tV VCtl Hi2Lim VCtl Hi2LimTm 3rd level V tV VCtl Hi3Lim VCtl Hi3LimTm 4th level V tV V...

Page 16: ...onnect the binary input of the testing device to the measurement inputs P4 and P5 on the measurement and disconnect terminals of the voltage measurement unit 4 Connect the testing device to the extern...

Page 17: ...tV with the parameters VCtl Lo6Lim and VCtl Lo6LimTm Frequency increase protection f tV with the parameters HzCtl Hi1Lim and HzCtl Hi1LimTm Frequency drop protection f tV with the parameters HzCtl Lo1...

Page 18: ...Storage Sunny Backup 49 561 9522 399 Sunny Central Sunny Central Storage 49 561 9522 299 SMA Online Service Center www SMA Service com Belgien Belgique Belgi Luxemburg Luxembourg Nederland SMA Benelux...

Page 19: ...umvit 55 Thonglor 17 Klong ton Nua Wattana 10110 Bangkok Thailand 66 20598220 smaservice spe co th Service Partner for Utility Tirathai E S Co Ltd 516 1 Moo 4 Bangpoo Industrial Es tate Sukhumvit Road...

Page 20: ...www SMA Solar com...

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