| 14 | Low voltage active power filter(APF) | 18 | Power failure or phase loss protection | Technical specification of low-voltage active power filter DL/T 1796-2017 6.2.2.4 |
| 19 | Over temperature protection | Technical specification of low-voltage active power filter DL/T 1796-2017 6.2.2.5 |
| 20 | Unbalanced voltage over limit protection | Technical specification of low-voltage active power filter DL/T 1796-2017 6.2.2.6 |
| 21 | Secondary equipment fault protection | Technical specification of low-voltage active power filter DL/T 1796-2017 6.2.2.7 |
| 22 | Primary circuit fault removal protection | Technical specification of low-voltage active power filter DL/T 1796-2017 6.2.2.8 |
| 23 | Fusing protection | Technical specification of low-voltage active power filter DL/T 1796-2017 6.2.2.9 |
| 24 | Communication function test | Technical specification of low-voltage active power filter DL/T 1796-2017 6.3 |
| 25 | IP test | Low-voltage active power filter JB/T 11067-2011 4.7 |
| Degrees of protection provided by enclosure GB/T 4208-2017IEC 60529:2013 |
| 26 | Technical specification of low-voltage active power filter DL/T 1796-2017 6.4 |
| Degrees of protection provided by enclosure GB/T 4208-2017IEC 60529:2013 |
| 27 | Temperature rise test | Low-voltage active power filter JB/T 11067-2011 5.13 |
| Semiconductor converters-General requirements and line commutated converters-Part 1-1: Specification of basic requirements GB/T 3859.1-2013 7.4.2 |
| Technical specification of low-voltage active power filter DL/T 1796-2017 6.10 |
| 28 | Input voltage allowable range test | Low-voltage active power filter JB/T 11067-2011 5.10 |
| 29 | Input frequency allowable range test | Low-voltage active power filter JB/T 11067-2011 5.11 |
| 30 | Total harmonic compensation rate test | Low-voltage active power filter JB/T 11067-2011 5.5 |
| 31 | Output current limiting capability test | Low-voltage active power filter JB/T 11067-2011 5.7 |
| 32 | Automatic current limiting test | Technical specification of low-voltage active power filter DL/T 1796-2017 6.7.5 |
| 33 | Loss measurement | Low-voltage active power filter JB/T 11067-2011 5.8 |
