Rapid shutdown arc fault presentation SPI 2014

www.solectria.com

Built for the real world Solectria Renewables / Company Confidential © 2014

Meeting New Arc Fault

Detection and Rapid

Shutdown Requirements

Claude Colp

Applications Engineer

[email protected]

mailto:[email protected]

www.solectria.com


Solectria Renewables

Company Overview

www.solectria.com


Solectria History

1989 2007 20082005 20092006 2010 2011 2012

Original 10kW

UL Listed

Solectria

Corporation

Founded

Solectria divests

vehicle products to

Azure Dynamics

60/82/95KW

UL Listed

SolrenView Web

Monitoring Introduced

Capacity Expansion to

200MW

PVI 60/77/90KW

UL Listed

PVI 13-15KW

UL Listed

PVI 3000-5300

Introduced

MSS

Introduced

Capacity Expansion to

800MW

Disconnecting String Combiners

Introduced

SGI 500XT transformerless 600V

DC inverter introduced

2013

PVI 14-28TL, 3-phase

transformerless inverters

2014

PVI 3800-7600TL,

1Ph transformerless

invertersIntroduced SGI 500 Premium Efficiency model with

97.5% CEC efficiency – highest in the industry

Capacity

Expansion

to 350MW

Introduced the SGI 500XTM & SGI 750XTM

External Transformer

Introduced PVI 50/60/75/85/100KW

& Premium Efficiency Models

• 1989 – Solectria Corporation founded

• 2005 – Solectria Corp. EV division sold to Azure

Dynamics

• 2005 – Solectria Renewables founded

• 2014 – Solectria became wholly owned

subsidiary of Yaskawa Electric

Solectria

Renewables

Founded

SGI Series

UL Listed

New SolrenView GUI

Introduced

Yaskawa Electric Acquires Solectria

Renewables as wholly owned subsidiary

ARCCOM (AFDI String Combiner)

Introduction

www.solectria.com


Yaskawa and Solectria

Yaskawa Electric Corp:

• $3.6 billion Japanese firm focused on motor drives, automation controls

and other electrical components

• Company founded in 1915

• 5th largest Japanese inverter supplier, but no U.S. presence

• Global leader in quality

• Manufacturing locations in strategic PV markets

• Track record for technological advancement and leadership

www.solectria.com


North American Presence

• Nationwide service locations to support

o Commissioning

o Rapid response times

• Nationwide Sales offices

• Strategies in place to expand into South/Central America

Solectria Office/Sales/Service

ServiceSolectria Sales

www.solectria.com


… Even More Solutions from the Industry’s

Best Inverter Lineup

PV Inverters

Utility External Transformer Inverters 500-750 kW

Megawatt Solar Stations 1-2MW

Commercial Central Inverters, 50-100, 225-500 kW

3-Phase String 14-28 kW

Residential String Inverters 3.8-7.6 kW

String Combiners

Web-Based Monitoring

PVI 3800-7600TL

PVI 14-20TL

PVI 23-28TL

PVI 50-100KW

SGI 225-500PE

SGI 500XT

SGI 500XTM

SGI 750XTM

www.solectria.com


NEC 2008-2014

www.solectria.com


New/Imminent Code Requirements

NEC 2008

No Arc-Fault Requirements

The Danger Zone

NEC 2011

Arc-Fault (690.11)

Fuse Servicing Disconnects (690.16)

NEC 2014

Grounded Conductor Ground Fault (690.5)

Rapid Shutdown (690.12)

www.solectria.com


NEC 2014 Adoption

• NEC 2014 adoption varies state by state

• By the end of 2014, 18 states plan to adopt NEC 2014

www.solectria.com


Primary System Topologies

• Disconnecting string combiner with AFDI + 3-phase central inverter

• 3-phase string inverter with AFDI

+

www.solectria.com


Rapid Shutdown

www.solectria.com


690.12 (C) Facilities with Rapid Shutdown

• NEC 690.12 (C) states: PV system circuits installed on or in buildings shall include

a rapid shutdown function that controls specific conductors in accordance with

690.12(1) through (5) as follows:

(1) Requirements for controlled conductors shall apply only to PV system conductors of more than 1.5m (5 ft) in length inside a building , or more than 3m (10 ft) from a PV array.

(2) Controlled Conductors shall be limited to not more than 30V and 240 volt-amperes within 10 seconds of rapid shutdown initiation.

(3) Voltage and power shall be measured between any conductor and ground

(4) The rapid shutdown initiation methods shall be labeled in accordance with 690.56(B)

(5) Equipment that performs the rapid shutdown shall be listed and identified.

www.solectria.com


To Inverter

10 foot boundary

Rapid Shutdown Controlled Conductors

www.solectria.com


To Inverter

10 foot boundary 24V dc

ON

ON

ON

ON


www.solectria.com


To Inverter

10 foot boundary 24V dc

OFF

OFF

OFF

OFF


www.solectria.com


DC Bus Capacitance

24V dc

ON

ON

ON

ON

AC Disconnect

ON

ON

DC Contactors in the inverter open when AC is off

SGI, SGI XT, and SGI XTM all have DC Vacuum Contactors

www.solectria.com


24V dc

OFF

OFF

OFF

OFF

AC Disconnect

OFF

OFF

SGI, SGI XT, and SGI XTM all have DC Vacuum ContactorsDC Contactors in the inverter open when AC is off

DC Bus Capacitance

www.solectria.com


DC Bus Capacitance

24V dc

ON

ON

ON

ON

AC Disconnect

ON

ON

DC Bus Capacitance must discharge within 10s

PVI does this in 2.5s

PVI does not have DC Vacuum Contactors

www.solectria.com


24V dc

OFF

OFF

OFF

OFF

AC Disconnect

OFF

PVI does not have DC Vacuum Contactors

DC Bus Capacitance

OFF

DC Bus Capacitance must discharge within 10s

PVI does this in 2.5s

www.solectria.com


To Panelboard

10 foot boundaryAC Disconnect

ON

ON

ON

ON

Controlled Conductors with 3-Phase String Inverters

www.solectria.com


To Panelboard

10 foot boundaryAC Disconnect

OFF

OFF

OFF

OFF

Controlled Conductors with 3-Phase String Inverters

www.solectria.com


www.solectria.com


www.solectria.com


www.solectria.com


Unfortunately, no breaker that fits in a residential panel exists!

www.solectria.com


ARCCOMArc-Fault Enabled String Combiners

• ARCCOMo 8, 12, 16 or 24 Fused Inputs

• Critical Component for: o Arc Fault (690.11)o Rapid Shutdown (690.12)o Fuse Servicing Disconnects (690.16)

• Key Features:o 600 or 1000 VDCo Contactor disconnecto Audible indicationo LED indicatorso Dry contact indicationo Lowest power consumption in the industry

• Optionso Stud connections for field-crimped lugso Surge arrestoro Internal power supply

www.solectria.com


Arc Fault

Detection

Circuitry

Optional Type 2

DC SPD

Optional 120Vac

Power Supply

DC Vacuum

Contactor

Finger Safe Fuse

Holders

DC Conduit Entry Location

Inside the ARCCOM

www.solectria.com


690.12 (C) Facilities with Rapid Shutdown

• NEC 690.12 (C) states: PV system circuits installed on or in buildings shall include

a rapid shutdown function that controls specific conductors in accordance with

690.12(1) through (5) as follows:

(1) Requirements for controlled conductors shall apply only to PV system conductors of more than 1.5m (5 ft) in length inside a building , or more than 3m (10 ft) from a PV array.

(2) Controlled Conductors shall be limited to not more than 30V and 240 volt-amperes within 10 seconds of rapid shutdown initiation.

(3) Voltage and power shall be measured between any conductor and ground

(4) The rapid shutdown initiation methods shall be labeled in accordance with 690.56(B)

(5) Equipment that performs the rapid shutdown shall be listed and identified.

Achieved by Inverter/ ARCCOM placement

Achieved by Inverter Shutdown or DC Contactors in the ARCCOM

TL Inverters and ARCCOM are listed

Provide a placard with the prescribed phrasing

No shorting out or free-floating the array to achieve 30V

www.solectria.com


(C) Facilities with Rapid Shutdown Buildings or structures with both utility service and a PV system complying with 690.12 shall have a permanent plaque or directory including the following wording:

PHOTOVOLTAIC SYSTEM EQUIPPED WITH RAPID SHUTDOWN

The plaque or directory shall be reflective, with letters capitalized and having a minimum height of 9.5mm (3/8 in.), in white on red background.

Where do you put this?

690.56 Identification of Power Sources

www.solectria.com


What is an arc-fault?

• The same amount of current must flow through a smaller

conductor

• Conductor heats up and eventually melts

Current

Current

• Healthy Wire

Current

• Air Ionizes and plasma allows current to flow across the gap• Temperatures can reach 15000 degrees Fahrenheit

www.solectria.com


690.11 ARC-Fault Circuit Protection

(Direct Current)• Photovoltaic Systems with dc source circuits, dc output circuits, or both, operating

at a PV system maximum system voltage of 80 volts or greater, shall be protected by

a listed (dc) arc-fault circuit interrupter, PV type, or other system components listed to

provide equivalent protection. The PV arc-fault protection means shall comply with

the following requirements:

(1) The system shall detect and interrupt arcing faults resulting from a failure in the intended continuity of a conductor, connection, module, or other system component in the dc PV source and dc PV output circuits.

(2) The system shall require that the disabled or disconnected equipment be manually restarted.

(3) The system shall have an annunciator that provides a visual indication that the circuit interrupter has operated. This indication shall not reset automatically.

www.solectria.com


Arc-Fault Detection

Detection based on telltale frequency characteristics

Inverters generate noise in the same range

UL 1699B

Source- Implementing Arc Detection in Solar Applications

Brett Novak, Texas Instruments

www.solectria.com


• NEC 690.11 requires manual reset

• Every arc-fault trip requires a truck roll

• ARCCOM has undergone 1 year of product compatibility testing to minimize nuisance tripping.

• Single sensor, reflection based technology is significantly more prone to nuisance tripping and more costly to maintain

String Level

Detection

Maximize SNR to Minimize Nuisance

Tripping

www.solectria.com


What does this mean for the end user?

• String level detection board identifies problem string down to 1 of 4 possible strings with a LED indicator light

• Provides faster troubleshooting of system after a fault

• Simplified isolation of damaged portion of array

• Faster recovery time > increased overall production while repairs take place

www.solectria.com


690.11 ARC-Fault Circuit Protection

(Direct Current)• Photovoltaic Systems with dc source circuits, dc output circuits, or both, operating

at a PV system maximum system voltage of 80 volts or greater, shall be protected by

a listed (dc) arc-fault circuit interrupter, PV type, or other system components listed to

provide equivalent protection. The PV arc-fault protection means shall comply with

the following requirements:

(1) The system shall detect and interrupt arcing faults resulting from a failure in the intended continuity of a conductor, connection, module, or other system component in the dc PV source and dc PV output circuits.

(2) The system shall require that the disabled or disconnected equipment be manually restarted.

(3) The system shall have an annunciator that provides a visual indication that the circuit interrupter has operated. This indication shall not reset automatically.

ARCCOM is listed to UL1699B

ARCCOM must be manually restarted

ARCCOM includes audible buzzer, LEDs, and auxilary contact

www.solectria.com


System Design Considerations for

ARCCOM

• The ARCCOM only requires power to

operate and has no communication with the

inverters at all.

• 24Vdc power can come from an external

power supply or from optional 100V-277V to 24V

power supply. (most common approach)

• 120VAC can have significant voltage drop

(20V from nominal) before optional power

supply will not work. Greater design flexibility.

• 277VAC can drop all the way to 100VAC and

still work! Smaller conductors necessary to

power ARCCOM

• Rapid shutdown disconnect placement

should be coordinated with first responders.

Best to avoid another Dietz & Watson

• Sub array level monitoring will remotely alert

you through alarms in the event of an arc fault

condition.

Date post:	10-Jul-2015
Category:	Engineering
Upload:	claude-colp
View:	249 times
Download:	3 times

Rapid shutdown arc fault presentation SPI 2014

Engineering