Commissioning process and sign off - Home - SSEG Municipal ... · –Electrical installation CoC...

Commissioning process and sign off

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Agenda

1. Is commissioning necessary?

2. Commissioning part of application process

3. Responsibilities and liabilities

4. High level commissioning and sign off process

5. Commissioning tests

Commissioning process and sign off

Is commissioning necessary?

• Oxford definition of commissioning:

“Bring (something newly produced) into working

condition”

• Solar Photovoltaic (PV) systems are

– New products

– Unique in design; Based on functionality and

constraints

– Has various integration challenges

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Is commissioning necessary?

• The client wants a safe (legal), well working system

• Supplier wants to honour their warrantee(s)

• Most installers wants to build and protect their reputation

• The network operator wants to protect the network, the

user(s) and community

Proper commissioning and reporting will help to

address some of the above mentioned requirements.

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Commissioning part of the application1. Application process to install SSEG

Figure 1: Summary of City of Tshwane’s Small Scale Embedded Generation application and approval process

INTERNAL TO MUNICIPALITY

PROCESS FOR THE CUSTOMER

AMEU Standard Document –

SSEG Commissioning Report

Optional commissioning tests

OPTIONAL TECHNICAL TEST SHEET for the small scale embedded generation

installations

Disclaimer: From a technical point of view the NRS097-2-1 test certificate covers these issues quite

thoroughly, so there are no safety concerns that REQUIRE the municipalities to do such tests as

described below. Municipalities may perform such tests on selected (few) installations for additional

comfort on safety aspects.

Project name:

Commissioning Test: ✓

Comments/Results

1. Anti-islanding test: (multi-meter required) With the system running (main breaker closed and SSEG producing power), OPEN the main breaker to the SSEG installation.

- Does the SSEG activate anti-islanding mode? Measure the voltage at the AC output terminals of the SSEG or at the connection point to the AC mains board.

YES/NO

…….……..V

2. SSEG Re-connection test 1: (stop watch required) With the main breaker OPEN and the SSEG in island mode, reconnect the mains (close main breaker). Measure the time the SSEG takes to reconnect to the network/grid.

……………….s

3. SSEG Re-connection test 2: (stop watch required) Take note of the reconnection time in test 2. With the main breaker OPEN and the SSEG OFF, CLOSE the main breaker. In 10 seconds or before the SSEG can reconnect to the grid, open the main breaker. Does the SSEG activate anti-islanding and disconnect from the grid?

YES/NO

4. Inspection of labels: Client side: Check that there are labels on the distribution board clearly indicating the SSEG infeed and point of connection(s). Check that there are labels on the outside of the distribution board Network/Grid Side: Check that there are labels on the feeder and substation, clearly indicating that there is SSEG present on this installation.

Responsibility and Liability Assignment

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Task/Process Customer Installer Municipality

Quote/Proposal for SSEG

systemApproves Responsible N/A

Quality of products and

installation; NRS 097-2-1,

SANS 10142-1 & 1-X

ApprovesResponsible

and LiableN/A

Do design of system by

competent person ApprovesResponsible

and Liable

Define

component

person

Municipal application done

for SSEGLiable Facilitate Approves

Network Capacity

investigation and allocation;

NRS 097-2-3

N/A Facilitate Responsible

Costs for network

upgrade/meter changes (if applicable)

Approves

and

Responsible

N/AProvide cost

implications


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Cost for additional network

charges (if applicable)

Approves

and

Responsible

N/AProvide cost

implications

Install correct meter or do

network upgrade (if applicable)N/A Facilitate Responsible

Procure and install EG

systemApproves

Responsible

and LiableN/A

Ensure installation is done

according to requirements(SANS -, NRS series, International

best practice, By Laws and other.)

N/AResponsible

and Liable

Provide

requirements

and

Approves

Commission EG system Approves:

Functions

Responsible

and Liable

Approves:

Safety


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Provide required documentsApproves

Responsible

and Liable

Check and

Approves

Register EG system on

databaseN/A Facilitate Responsible

Ensure to uphold

arrangements set out in the

SSEG contract between

customer and municipality.

Liable N/AProvides

contract

Maintenance of SSEG

system Responsible Optional N/A

Resolve/exchange faulty

equipment (under warrantee or

not)

Approves Responsible Approve

Areas in green: PV GreenCard serve as QA

High level commissioning and sign off process

1. Solar PV system needs to be designed by installer and

signed off by Pr. Engineer or Pr. Technician Eng.

2. Installation realised under a qualified & registered

electrician.

3. Electrician provides CoC (Certificate of compliance) for

installation

4. Installer provides a signed off as-built drawing to client

after system works as specified

5. Small Scale Embedded Generator (SSEG) Contract to

be signed

6. Installer to provide AMEU commissioning report and

required attachments.

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Commissioning and sign off process:

Important for Municipalities• Declaration by ECSA registered person

1. EG installation complies with relevant sections for

NRS 097-2-1 and NRS 097-2-3

2. Loss of mains protection (Anti-Islanding) has been

checked to be functional

3. Safety labels have been fitted according to

NRS 097-2-1

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Commissioning and sign off process:

Important for Municipalities• Declaration by ECSA registered person

4. The SSEG installation complies with the relevant

sections of SANS 10142-1 and other relevant SANS

5. The SSEG installation complies with licensing

requirements of NERSA

6. Reverse power blocking protection system (grid limiting)

installed and commissioned (Not recommended due to

potential revenue loss and safety concerns)

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Sign Off Highlights

1. Installer/ Supplier/ Customer confirms that

Municipal SSEG is possible

2. Customer SIGNS OFF quote; Provided by

Installer/ Supplier with optional pre design

3. Supplier/ Installer applies on behalf of the customer for Solar PV

SSEG grid interconnection

4. Municipality gives a SIGNED OFF (pre) approval letter with

specific requirements

5. Solar PV SSEG is installed.

6. Solar PV SSEG is commissioned by Reg. Electrician; Optional: Municipality attend

commissioning

7. SIGN OFF

- Pr. Eng. as-builtdesign and

-Registered electrician CoC

8. Installer/Customer provides the relevant and

requested documents (including SIGNED

contract) to the local municipality

9. (If applicable) Municipality upgrade

supply connection and/or change meter

10. Municipality gives a SIGNED OFF confirmation of

documents received (final approval letter). Register

SSEG

11. System needs to be decommisioned: SIGNED OFF CoC by electrician and decommision report

done by installer/customer

12. Provide Municipality with decomissioning

notice

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- Commissioning tests -

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Preparation

Site visit and attending commissioning tests could be

required to

• Verify information from application documents

• Confirm safe integration and operation of SSEG

Prior to site visit

• Prepare documentation

– Application documents

– Customer/Installer details

– Address and location of site

– Diagram of local network

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Preparation

Prior to site visit (cont.)

• PPE, tools and access keys

– PPE for working with electricity and (if required) on heights

– Tools to open distribution boards

– Access keys

– Electrical tester (Clamp on tester to measure current)

– Stop watch

– General electrical tools

• Arrangements for access and testing

– Ideally a week before site visit

– Indicate what you would like to do (could take 60min per tie in point)

– Request a competent person for executing tests at the SSEG

– Arrange security clearance/access (if required)

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Site Visit

During site visit

1. Verify details of the customer and installer

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Site Visit

During site visit

1. Verify details of customer and installer

2. Verify the SSEG system details

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Site Visit

During site visit

1. Verify details of customer and installer

2. Verify the SSEG system details

3. Make sure relevant documents are provided

– Inverter type test according to NRS 097-2-1 done by accredited 3rd party

test house

– Electrical installation CoC done according to SANS 10142-1 (and

10142-1-X when published)

– Final signed as-built single line diagram (SLD) to be provided

– Supplemental EG contract signed with network operator

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Site Visit

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Commissioning Tests - Disclaimer

Disclaimer:

• From a technical point of view the NRS097-2-1 test certificate

covers these issues quite thoroughly, so there are no safety

concerns that REQUIRE the municipalities to do such tests as

described here.

• Municipalities may perform such tests on selected (few) installations

for additional comfort on safety aspects.

• NB! - Municipal employees may supply the testers but is not allowed

to operate on electrical installations that is not part of their scope. It’s

the facility owners responsibility to delegate this function to capable

people of their choice who will be responsible & liable for testing.

Especially for testing at the SSEG main breaker; Option B.

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Commissioning Tests

Testing Point

• Determine at which circuit breaker measurements will be taken

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Commissioning Tests

Testing Point

• Option A

• Pros: Assurance about anti-islanding of SSEG, irrespective of the

wiring of the SSEG.

– Cons: Operation could be interrupted, current measurement

includes other loads.

• Option B

• Pros: Operations will not be influenced, current measurements

mainly represents SSEG operation current.

– Cons: Need to ensure that the SSEG is correctly integrated into

the relevant distribution circuit. Testing needs to be executed by

competent SSEG operator/facility owners.

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Commissioning Tests

• Step 0 – Measure voltage and current of breaker

Voltage measurement between a phase and neutral; 237.8V

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Commissioning Tests

• Step 0 – Measure voltage and current of breaker

Current measurement of a phase: 4.4A

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Commissioning Tests

• Step 1 – Test for Anti-Islanding

This test is to ensure that the SSEG will not produce electricity and

feedback into the grid during a power outage.

– Step 1.1 Check to see that SSEG is operating, connected and

producing power

– Step 1.2 While the SSEG is operating and producing power,

switch off the chosen breaker.

– Step 1.3 Measure the voltage and current on the load side

(SSEG or bottom side) of the breaker. Write down the voltage

value in the commissioning form.

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Commissioning Tests


Voltage measurement between a phase and neutral: 0.0V

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Commissioning Tests


Current measurement of a phase: 0.0A

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Commissioning Tests


Current and voltage measurement of a phase: 0.0A and 0.0V

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Commissioning Tests


– Step 1.4 (If possible) Check to see if inverter indicated

disconnection to the grid and/or operation discontinued.

Inverter Display – Utility supply OFF

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Commissioning Tests


– Step 1.5 – If there is no voltage measured on the SSEG side of

the breaker, then it can be accepted that the SSEG activated

anti-islanding mode. Indicate Yes on the commissioning form

above the measured voltage.

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Commissioning Tests

• Step 2 – Test reconnection time

This test is to see if the inverter adheres to the NRS 097-2-1

reconnection requirement. A stop watch will be needed.

– Step 2.1 After step 1, close the chosen breaker and start timing.

– Step 2.2 Once the SSEG starts producing power (either

indicated on the inverter display or being able to measure

current for Option B), stop the timer and record the value on the

commissioning form. The minimum value should be at least 60s.

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Commissioning Tests

• Step 2 – Test reconnection time

Inverter Display – Utility supply ON

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Commissioning Tests

• Step 3 – Reconnection “Dummy test”

This test is to see if the SSEG will start to operate after being exposed

to the utility supply for a short while.

– Step 3.1 Switch the SSEG system off by opening the breaker.

– Step 3.2 Close the chosen breaker for only 10 seconds,

– Step 3.3 Switch the SSEG system off again (Open the breaker).

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Commissioning Tests

• Step 3 – Reconnection “Dummy test”

– Step 3.3 If the SSEG system stays off after 60 seconds the

SSEG is disconnected from the grid and Anti-Islanding mode has

activated. Record the latter on the commissioning form.

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Labels Inspection

• Step 4 – Inspection of labels

– Step 4.1 Check to see if the SSEG installation is indicated at the

main AC distribution board.

– Step 4.2 Check to see if the SLD is installed, indicating where

and how the SSEG is interconnected.

– Step 4.3 Check to see if safe operations and/or emergency

isolation instructions are provided (Optional).

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Labels Inspection

• Step 4 – Inspection of labels

– Step 4.4 Check to see if there is an installed label indicating an

installed SSEG at the point of Supply (Meter box) and preferable

also at the relevant transformer.

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Extra Considerations

• It would be ideal if power quality measurements could be

done for a few weeks prior and post to the

commissioning (mainly >100kWp).– The existing power quality issues can be quantified

– The effect of embedded generation can be identified

– Provides a better understanding of how EG can influence the grid

• Operation of SSEG systems using a combination of solar PV

SSEG, batteries and/or generators (Hybrid systems) need to

be clearly explained and demonstrated.

• Generators with synchronisation capabilities needs to adhere

to the NRS 097-2-1 requirements and also documented.

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Extra Considerations

• The first test could take a while if there is multiple tie in

points.

• The single line diagram (SLD) needs to be checked and

verified before commencing with any tests

• One official could be checking the number, size, serial

numbers of the inverters, while the other do the tests.

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