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Inverters/Converters -- North America Requirement
Inverters/Converters – North America Requirement
1: Constructional Requirement
2: Testing Requirement
3: Document Requirement
4: Hot-discussion items
5: Q & A
10/22/2012 2
(Inverter: DC power to AC power)
10.26.2012 USA 3
ANSI/UL1741 (call out IEEE 1547 &1547.1 for grid protection and
power quality, etc.), NRTL certification
- Tests acc. to the standard and 2-4 factory inspections per year
- Test mark issued by TUV Rhinalnd TUVus
National Electrical Code (NEC 70)
California CEC (California Energy Commission)
- Third party measurments per CEC Guideline
- As a member of NRTL, TÜV Rheinland reports are accepted
Known regional requirements, certification regulations
10.26.2012 Canada 4
• CSA C22.2 No. 107.1 certificate
- Tests acc. to the standard and 2-4 factory inspections per
year
- Test mark mark issued by TUV Rhinalnd, cTUV
• Canada Electrical Code (CEC)
Known regional requirements, certification regulations
10.26.2012 Inverter/Converter 5
- Enclosure (including materials, NEMA rating, openings, hazard
protections, etc.) and the frame construction;
- Spacings and/or Cl & Cr (UL840);
- Switch, Disconnect Devices;
- Connections and wiring means;
1. Constructional Requirement (US & Canada)
10.26.2012 Inverter/Converter 6
- Grounding, over-current protection;
- Isolation of circuits (Input – Output – Control Circuits)
- Built-in GFDI, means of design (fuse, or solid-state devices);
- Components and insulation materials;
- Utility interaction (field adjustable tripping, etc.)
1. Constructional Requirement (US & Canada)
2. Testing Requirements (US & Canada)
10.26.2012 Inverter/Converter 7
- UL 1741 Testing:
- Temperature rise measurement , need to be tested at a
chamber of max. specified environment temperature if it was
marked more than 40C;
- Output short-circuit test
- GFDI verification test
- Hi-Pot Test
2. Testing Requirements (US & Canada)
10.26.2012 Inverter/Converter 8
- IEEE 1547.1 part (call out part by UL 1741);
- Testing order (abnormal voltage – abnormal frequency –
synchronization – EMI – surge – repeat);
- Anti-islanding test;
- Harmonics and DC injection if no isolating transformer;
- Reconnection time;
- Open phase.
2. Testing Requirements (US & Canada)
10.26.2012 Inverter/Converter 9
- Additional tests for Canada
- C22.2 #107.1 testing, which different to that of UL 1741, such
as grounding continuity/resistance measurement ;
- Grid-connection requirement, use IEEE 1547.1 test results
2. Testing Requirements (US & Canada)
10.26.2012 Inverter/Converter 10
- Manufacturing and production tests (routine test):
- Dielectric Voltage-Withstand (Hi-Pot) Test;
- Utility Voltage and Frequency Variation Test.
2. Testing Requirements (US & Canada)
10.26.2012 Inverter/Converter 11
- CEC testing and report for NRTL listed/certified inverters:
- Maximum continuous output power;
- Conversion Efficiency;
- Tare losses.
3. Document Requirements
10.26.2012 Inverter/Converter 12
- Rating and Nameplate;
- Warning, Cautionary Markings;
- Equipment Information and Instructions;
- Service Manual independent of User/Operation/Installation
manuals;
- Important Safety Instructions
3. Document Requirements
10.26.2012 Inverter/Converter 13
- Additional requirements for Canada:
- At least the Warning/Cautionary Markings in both English and
French;
- Manufacturing date, different wording to that of UL 1741, etc.
- More than one live circuit, etc.
- Others.
4. Hot-discussion Items
10.26.2012 Inverter/Converter 14
- Safety standard harmonization (UL62109-1) with IEC 62109-1:
Safety of power converters for use in photovoltaic power systems –
Part 1: General requirements
and IEC 62109-2:
Safety of power converters for use in photovoltaic power systems –
Part 1: Particular requirements for inverters
to be expected to be followed;
4. Hot-discussion Items
10.26.2012 Inverter/Converter 15
- New Standard: IEC 62477-1: 2012,
Safety requirements for power electronic converter systems and
equipment – Part 1: General
It has a better suitability than EN 50178/IEC 62103: Electronic
equipment for use in power installations, for non-PV products,
such as wind power converters (AC – AC), etc.
4. Hot-discussion Items
10.26.2012 Inverter/Converter 16
- Grid connection and power quality requirements
(differ by countries)
EN 50438: Requirements for the connection of micro-
generators in parallel with public low-voltage
distribution networks
4. Hot-discussion Items
10.26.2012 Inverter/Converter 17
- Transformer-less inverters
Conventional inverters normally have an isolation transformer either
built-in the unit or connected external to the AC output terminals.
While transformer-less inverter means the AC output circuits (which
may directly connected to the 120Vac/480Vac grid) are not isolated
to the DC input circuits.
What the standard(s) says about this case?
Please see IEC 62109-2, also it was adopted into UL 1741 as
section 88-100.
4. Hot-discussion Items
10.26.2012 Inverter/Converter 18
- Input working voltage over 600Vdc
Though UL 1741 does not specify the max. working voltage is
600V, due to the rating limits of components, the spacing table,
etc., once the input working voltage is more than 600Vdc,
additional evaluations are needed to verify the compliances.
(see Article 690.80 of NEC 70 too)
In Canada, CSA C22.2 # 107.1 stated that it applies to a unit its
rated voltage not exceeding 600 V. What we need to do in the
case of the DC input is up to 1000V?
4. Hot-discussion Items
10.26.2012 Inverter/Converter 19
- PV Arc-fault detection/interruption per UL 1699B (based
with UL 1699)
Article 690.11 of NEC 70 (2011) requires listed DC Arc-fault circuit
interrupter when the PV system working voltage is more than 80V.
IF the PV arc-fault protection means are built-in type in the inverter, it
shall meet that all that 4 requirements specified in 690.11 of NEC 70.
4. Hot-discussion Items
10.26.2012 Inverter/Converter 20
- Built-in meter accuracy
SGIP(Self-Generation Incentive Program) Handbook and
CSIP(California Solar Initiative Program) Handbook, etc. have meter
accuracy requirements for built-in meter within inverters.
(+/-2% or +/-5% per the applicable protocols of ANSI C12.1)
“The accuracy rating of the meter must be certified by an independent
testing body (i.e. a NRTL such as UL or TUV)”
5. Q & A
10.26.2012 Inverter/Converter 21
Contact :
Fred Z. Zhu
Phone: (925) 249-9123 ext. 186
Cell: (925) 918-5123
Email: [email protected]