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| ドキュメント名 | Littelfuse Solar Product Capabilities Training |
|---|---|
| ドキュメント種別 | 製品カタログ |
| ファイルサイズ | 1.4Mb |
| 取り扱い企業 | マウザー・エレクトロニクス (この企業の取り扱いカタログ一覧) |
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このカタログの内容
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Solar Product
Capabilities Training
December 2020
1
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With over 25 million devices installed in
photovoltaic power systems, Littelfuse
understands the challenges facing the solar
market. Our solar-rated solutions protect
equipment and systems subjected to harsh,
photovoltaic installations.
Confidential and Proprietary | Littelfuse, Inc. © 2020 2
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Photovoltaic
Applications
Page4
Photovoltaic (PV) System Applications Overview
Confidential and Proprietary | Littelfuse, Inc. © 2020 4
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Fuse Selection Table (Grounded System)
String Protection Array Protection
String Combiner/HC
Voltage Wire Harness/HC Homeruns Array Combiner/Central Inverter
Combiners/String Inverter
SPXI (25 A – 32 A) SPXV (25 A – 32 A)
SPXI (35 A to 60 A) SPXV (35 A to 60 A) Fuse: SPNH (70 A – 400 A)
1500 V
SPXI (2.5 A – 20 A) SPXV (6 A – 20 A) Holder: LFNH15200FBC
Holder: N/A Holder: LPXV/LFXV
SPFI (2 A – 30 A) SPF (1 A – 30 A) SPFJ (70 A – 450 A)
1000 V
Holder: N/A Holder: LPHV Holder: LFJ1000 Series
Confidential and Proprietary | Littelfuse, Inc. © 2020 5
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Fuse Selection Table (Ungrounded System)
PV Panels in an String
Array Combiners
SE-601
String Protection Array Protection
String Combiner/HC
Voltage Wire Harness/HC Homeruns Array Combiner/Central Inverter
Combiners/String Inverter
SPXI (25 A – 32 A) SPXV (25 A – 32 A)
SPXI (35 A to 60 A) SPXV (35 A to 60 A) Fuse: SPNH (70 A – 400 A)
1500 V
SPXI (2.5 A – 20 A) SPXV (6 A – 20 A) Holder: LFNH15200FBC
Holder: N/A Holder: LPXV
SPFI (2 A – 30 A) SPF (1 A – 30 A) SPFJ (70 A – 450 A)
1000 V
Holder: N/A Holder: LPHV Holder: LFJ1000 Series
Confidential and Proprietary | Littelfuse, Inc. © 2020 6
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Why Solar
Fuses?
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Why Solar Fuses are Unique
▪ Higher dc voltages – typically 450 - 1500 V dc for
better efficiency
▪ Improved thermal cycling – to withstand repeated
daytime/nighttime temperature variations
▪ Harsher ambient temperatures – may range from
-40 ˚C to 90 ˚C
▪ Better protection for low-overload currents – lower currents
are not always protected by high-voltage or semiconductor fuses
▪ Better longevity and reliability – when compared to
general-purpose fuses
8 Confidential and Proprietary | Littelfuse, Inc. © 2020 8
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Solar Standards Require Additional Testing
▪ UL 2579 (UL 248-19) and IEC 60269-6
Standards require testing beyond those for
general-purpose fuses to simulate service
environment conditions of a photovoltaic
(PV) installation
▪ Additional testing verifies…
• Fuse interrupting capabilities
• Functionality at temperature extremes
• Current cycling to assure reliability and
longevity when subject to constant
temperature changes and current loads
Confidential and Proprietary | Littelfuse, Inc. © 2020 9 9
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Failure Mode – Reverse Overcurrent
Reverse Overcurrent
Negative Positive
Normal Current Flow
The purpose of this demonstration is to show the dangers of reverse overcurrents on
a solar panel without the proper fuse protection.
Confidential and Proprietary | Littelfuse, Inc. © 2020 10
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String Protection
Reverse Overcurrent
Combiner Box Grid-tied inverter with
no utility backfeed
1. Normal flow of current
2. Fault occurs
3. Backfeed current
4. Uncontrolled backfeed current heats
panels and ignites
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String Protection
Protected Reverse Overcurrent
Combiner Box
Grid-tied inverter with
no utility backfeed
1. Normal flow of current
2. Fault occurs
3. Backfeed current
4. String 1 fuse prevent reverse-current
damage to panels in string 1
Note: GFDI fuse in Inverter may also open depending on fault location and path
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Array Protection
System Configuration
String
Panels Combiner
s
Array
Combiner
▪Multiple arrays are combined to form a complete PV system
▪Power runs through a DC to AC inverter and out to the grid
▪Properly protected systems employ fuses on the string and array combiners
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Array Protection
Reverse Overcurrent on Unprotected Array
String
Panels Combiners
Array Combiner
Fus Fuse
1e – Monitor
5A
1. Normal flow of current 4. Second fault occurs
2. Ground fault occurs 5. Reverse overcurrent
3. System functions normally 6. Uncontrolled reverse overcurrent
(ground-fault remains undetected) ignites cable
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Array Protection
Reverse Overcurrent on Fuse Protected Array
String
Panels Combiner
s Array Combiner
Fus Fuse
1e – Monitor
5A
1. Normal flow of current 4. Second fault occurs
2. Ground fault occurs 5. Reverse overcurrent
3. System functions normally 6. Combiner fuse opens and system
(ground-fault remains undetected) returns to normal functioning state
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Solar Fuses
Overview
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Solar Fuse Line
Product SPXV SPXI SPNH SPF SPFI SPFJ
Series String Style In-Line Style NH Style Midget Style In-Line Style Array Series
Voltage
1500 V dc 1500 V dc 1500 V dc 1000 V dc 1000 V dc 1000 V dc
Ratings
Amperage 70 to 450 A
1 to 60 A 1 to 60 A 70 to 400 A 1 to 30 A 2 to 30 A
Ratings
Interrupting
30 kA 50 kA 15 kA 20 kA 20 kA 10 kA & 20 kA
Ratings
LFPXV
Fuse Holder NA LFNH LPHV NA LFJ1000
LFXV15 (35–60 A)
Approvals UL Recognized, CSA, CE, RoHS
Confidential and Proprietary | Littelfuse, Inc. © 2020 17
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Relays, Surge
Protective Devices
& Dc Disconnect
Switches Overview
Page19
EL731 Series: Earth Leakage Relays
▪ Ground-fault detection
▪ Adjustable ground-fault pickup (30 mA - 5A)
and time delay (for coordination)
▪ Panel mountable (surface and DIN-rail
mountable with optional kit)
▪ Three Form C output contacts
▪ Analog or digital outputs
▪ CT-Loop monitoring
▪ Harmonic filtering
▪ 0 - 6,000 Hz frequency range
Confidential and Proprietary | Littelfuse, Inc. © 2020 19
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SE-601 Series: Ground-Fault Relays
▪ Adjustable ground-fault pickup (1 - 20mA) and delay
▪ Available in 24, 48, 120/240 V dc models
▪ Microprocessor based; no need for calibration
▪ Features output contacts for trip circuits
▪ Non-volatile trip memory
▪ Limit ground fault currents to 25 mA
▪ Panel, surface and DIN-rail mountable
Confidential and Proprietary | Littelfuse, Inc. © 2020 20