Description
Overview
- The ASF-441H Anti-Islanding Protection Device is a new-generation protection device independently developed and manufactured by our company. It is designed to disconnect specified power equipment (such as transmission lines or unit transformers) when the system frequency or voltage drops, thereby ensuring the safe and stable operation of the power grid (including low-frequency/low-voltage disconnection, high-frequency/low-voltage disconnection, and rapid startup of standby units under low-frequency/low-voltage conditions). It features functions such as low-frequency detection, low-voltage detection, over-frequency detection, over-voltage detection, and reverse power detection.
Protection Functions (with ANSI Code)
- Three-stage compound voltage blocking directional overcurrent protection — ANSI 51V/67
- Three-round underfrequency protection: slip blocking and undervoltage blocking can be enabled or disabled; underfrequency load shedding output supports trip or alarm selection — ANSI 81U
- Three-round undervoltage load shedding function — ANSI 27
- Overfrequency protection: undervoltage blocking can be enabled or disabled; overfrequency load shedding output supports trip or alarm selection — ANSI 81O
- Overvoltage protection — ANSI 59
- Reverse power protection — ANSI 32R
- Reverse power recovery function
- Out-of-step splitting protection — ANSI 78
- Loss of voltage protection — ANSI 27
Communication Functions
- The device supports three communication modes: RS-485, CANbus, and Ethernet (to be specified at the time of ordering);
- The device uploads real-time data, including measurement data, waveform data, faults, alarm signals, and all protection settings, configurations, and coefficients; it supports remote online modification of settings and activation/deactivation of protection functions;
Event Logging and Fault Recording
- Event logging includes protection trip events and device self-test faults;
- For protection trip events, the type, time of trip, and operating parameters at the time of trip are recorded; for device self-test faults, the type and time of occurrence are recorded;
- Fault recording includes: the time and type of the protection trip, as well as the rms values before and after the recording was initiated;
- Fault recording data length: 2 cycles before the fault and 4 cycles after the fault for each channel, totaling 192 data points per channel;
- SOEs can retain 48 sets of data in non-volatile memory, and fault reports can retain 16 sets of data in non-volatile memory
Monitoring Functions
- The device is capable of measuring analog quantities such as current, voltage, and frequency;
- It acquires position signals (e.g., circuit breaker, energy storage, isolating switch, remote/local) and other digital signals;
- It provides control functions for closing and opening circuit breakers.
Setting Table
| No. | Display Name | Range | Step | Remark |
|---|---|---|---|---|
| 1 | **Stage 1 Protection Setting | |||
| 1.1 | Stage 1 Protection Enable/Disable | 1/0 | — | Stage 1 protection function: Enable(1)/Disable(0) |
| 1.2 | Stage 1 Compound Voltage Blocking | 1/0 | — | Stage 1 compound voltage blocking: Enable(1)/Disable(0) |
| 1.3 | Stage 1 Directional Blocking | 1/0 | — | Stage 1 directional blocking: Enable(1)/Disable(0) |
| 1.4 | Stage 1 Time Delay | 0～120.00s | 0.01s | — |
| 1.5 | Stage 1 Setting Value | 0.4～99.99A | 0.01A | — |
| 2 | Stage 2 Protection Setting | |||
| 2.1 | Stage 2 Protection Enable/Disable | 1/0 | — | Stage 2 protection function: Enable(1)/Disable(0) |
| 2.2 | Stage 2 Compound Voltage Blocking | 1/0 | — | Stage 2 compound voltage blocking: Enable(1)/Disable(0) |
| 2.3 | Stage 2 Directional Blocking | 1/0 | — | Stage 2 directional blocking: Enable(1)/Disable(0) |
| 2.4 | Stage 2 Time Delay | 0～120.00s | 0.01s | — |
| 2.5 | Stage 2 Setting Value | 0.4～99.99A | 0.01A | — |
| 3 | Stage 3 Protection Setting | |||
| 3.1 | Stage 3 Protection Enable/Disable | 1/0 | — | Stage 3 protection function: Enable(1)/Disable(0) |
| 3.2 | Stage 3 Compound Voltage Blocking | 1/0 | — | Stage 3 compound voltage blocking: Enable(1)/Disable(0) |
| 3.3 | Stage 3 Directional Blocking | 1/0 | — | Stage 3 directional blocking: Enable(1)/Disable(0) |
| 3.4 | Stage 3 Time Delay | 0～120.00s | 0.01s | — |
| 3.5 | Stage 3 Setting Value | 0.4～99.99A | 0.01A | — |
| 4 | 1st Stage Underfrequency Setting | |||
| 4.1 | 1st Stage Underfrequency Enable/Disable | 1/0 | — | Underfrequency protection: Enable(1)/Disable(0) |
| 4.2 | 1st Stage Time Delay | 0～120.00s | 0.01s | — |
| 4.3 | 1st Stage Setting Value | 46～50.00Hz | 0.01Hz | — |
| 5 | 2nd Stage Underfrequency Setting | |||
| 5.1 | 2nd Stage Underfrequency Enable/Disable | 1/0 | — | Underfrequency protection: Enable(1)/Disable(0) |
| 5.2 | 2nd Stage Time Delay | 0～120.00s | 0.01s | — |
| 5.3 | 2nd Stage Setting Value | 46～50.00Hz | 0.01Hz | — |
| 6 | 3rd Stage Underfrequency Setting | |||
| 6.1 | 3rd Stage Underfrequency Enable/Disable | 1/0 | — | Underfrequency protection: Enable(1)/Disable(0) |
| 6.2 | 3rd Stage Time Delay | 0～120.00s | 0.01s | — |
| 6.3 | 3rd Stage Setting Value | 46～50.00Hz | 0.01Hz | — |
| 7 | General Underfrequency Setting | |||
| 7.1 | Startup Time Delay | 0～120.00s | 0.01s | — |
| 7.2 | Startup Setting Value | 46～50.00Hz | 0.01Hz | — |
| 7.3 | Acceleration Time Delay | 0～120.00s | 0.01s | — |
| 7.4 | Df/dt1 | 1.0～9.9Hz/s | 0.1Hz/s | Slip blocking setting value |
| 7.5 | Df/dt2 | 1.0～9.9Hz/s | 0.1Hz/s | Slip blocking setting value |
| 8 | Overfrequency Protection | |||
| 8.1 | Overfrequency Stage 1 Enable/Disable | 1/0 | — | Overfrequency protection: Enable(1)/Disable(0) |
| 8.2 | Overfrequency Stage 2 Enable/Disable | 1/0 | — | Overfrequency protection: Enable(1)/Disable(0) |
| 8.3 | Overfrequency Protection Trip Mode | 1/0 | — | Overfrequency: Trip(1)/Alarm(0) |
| 8.4 | Undervoltage Blocking for Overfrequency | 1/0 | — | Undervoltage blocking: Enable(1)/Disable(0) |
| 8.5 | Stage 1 Time Delay | 0.1～120.00s | 0.01s | — |
| 8.6 | Stage 1 Setting Value | 50～54Hz | 0.01Hz | — |
| 8.7 | Stage 2 Time Delay | 0.1～120.00s | 0.01s | V3.11 and above |
| 8.8 | Stage 2 Setting Value | 50～54Hz | 0.01Hz | — |
| 9 | 1st Stage Undervoltage Setting | |||
| 9.1 | 1st Stage Undervoltage Enable/Disable | 1/0 | — | Undervoltage protection: Enable(1)/Disable(0) |
| 9.2 | 1st Stage Time Delay | 0～120.00s | 0.01s | — |
| 9.3 | 1st Stage Setting Value | 0～100.00V | 0.01V | — |
| 10 | 2nd Stage Undervoltage Setting | |||
| 10.1 | 2nd Stage Undervoltage Enable/Disable | 1/0 | — | Undervoltage protection: Enable(1)/Disable(0) |
| 10.2 | 2nd Stage Time Delay | 0～120.00s | 0.01s | — |
| 10.3 | 2nd Stage Setting Value | 0～100.00V | 0.01V | — |
| 11 | 3rd Stage Undervoltage Setting | |||
| 11.1 | 3rd Stage Undervoltage Enable/Disable | 1/0 | — | Undervoltage protection: Enable(1)/Disable(0) |
| 11.2 | 3rd Stage Time Delay | 0～120.00s | 0.01s | — |
| 11.3 | 3rd Stage Setting Value | 0～100.00V | 0.01V | — |
| 12 | General Undervoltage Setting | |||
| 12.1 | Phase Voltage for Undervoltage Judgment | 1/0 | 0.01s | — |
| 12.2 | Startup Time Delay | 0～120.00s | 0.01s | — |
| 12.3 | Startup Setting Value | 0～100.00V | 0.01V | — |
| 12.4 | Acceleration Time Delay | 0～120.00s | 0.01s | — |
| 12.5 | Voltage Difference Setting Value | 0～100.00V | 0.01V | — |
| 12.6 | Dv/dt1 | 1.0～9.9V/s | 0.1V/s | Voltage difference blocking value |
| 12.7 | Dv/dt2 | 1.0～9.9V/s | 0.1V/s | Voltage difference blocking value |
| 13 | Overvoltage Protection | |||
| 13.1 | Overvoltage Protection Enable/Disable | 1/0 | — | Overvoltage protection: Enable(1)/Disable(0) |
| 13.2 | Overvoltage Trip Mode | 1/0 | — | Trip(1)/Alarm(0) |
| 13.3 | Overvoltage Time Delay | 0～120.00s | 0.01s | — |
| 13.4 | Overvoltage Setting Value | 0～120.00V | 0.01V | — |
| 14 | Reverse Power Protection | |||
| 14.1 | Reverse Power Protection Enable/Disable | 1/0 | — | Reverse power protection: Enable(1)/Disable(0) |
| 14.2 | Reverse Power Startup Undervoltage | 1/0 | — | — |
| 14.3 | Reverse Power Startup Underfrequency | 1/0 | — | — |
| 14.4 | Reverse Power Time Delay T | 0～120.00s | 0.01s | — |
| 14.5 | Reverse Power Setting P | 0.05～0.2Pn | 0.01 | — |
| 15 | Reverse Power Recovery Setting | |||
| 15.1 | Reverse Power Recovery Enable/Disable | 1/0 | — | — |
| 15.2 | Close after Recovery | 1/0 | — | — |
| 15.3 | Recovery Power Setting P | 0.05～0.2Pn | 0.01 | Coefficient; Protection setting = Rated Power × Coefficient |
| 15.4 | Recovery Time Delay T | 0～120.00s | 0.01s | — |
| 16 | Out-of-Step Splitting Setting | |||
| 16.1 | Out-of-Step Splitting Enable/Disable | 1/0 | — | — |
| 16.2 | Out-of-Step Voltage Setting | 0.4～120.00V | 0.01V | 0.5UN |
| 16.3 | Oscillation Times | 0～20 | — | Default: 5 |
| 17 | General Setting | |||
| 17.1 | Loss of Voltage Protection Enable/Disable | 1/0 | — | — |
| 17.2 | Loss of Voltage Setting Value | 0～120.00V | 0.01V | — |
| 17.3 | Loss of Voltage Time Delay | 0～120.00s | 0.01s | — |
| 17.4 | PT Broken Line Enable/Disable | 1/0 | — | PT broken line detection: Enable(1)/Disable(0) |
| 17.5 | Blocking Exit on PT Broken Line | 1/0 | — | 1: Exit compound voltage & directional blocking
0: Quit protection blocked by compound voltage & direction |
| 17.6 | 3P4W Voltage Wiring | 1/0 | — | 3-phase 4-wire(1)/3-phase 3-wire(0) |
| 17.7 | 380V Measurement Voltage | 1/0 | — | 380V(1)/100V(0) |
| 17.8 | 1A Rated Current Mode | 1/0 | — | 1A(1)/5A(0) |
| 17.9 | Protection Output Interlock | 1/0 | — | C1C2 interlock 5th output: Enable(1)/Disable(0) |
| 17.10 | Rated Secondary Current | 0.5～6A | 0.01A | Secondary rated current |
| 17.11 | Negative Sequence Voltage | 5～100.00V | 0.01V | Negative sequence voltage limit for overcurrent blocking |
| 17.12 | Undervoltage Blocking Value | 0～100.00V | 0.01V | Undervoltage limit for overcurrent blocking |
| 17.13 | Low Voltage Blocking Setting | 0～100.00V | 0.01V | Blocking value for overfrequency, underfrequency and voltage loss |
Outline and Installation Dimensions
FAQ
Q：What is the purpose of an anti-islanding relay?
A:Due to grid or natural factors, the local power system is likely to operate in island mode, posing risks to equipment and the grid. In solar power projects, the anti islanding protection solar inverter serves as the primary defense with inherent anti-islanding capabilities.
Though inverters (including the anti islanding protection solar inverter) and wind power systems have basic anti-islanding functions, installing an anti islanding protection relay at grid connection points provides reliable backup to enhance safety.
Note that anti virus protection installation long island is irrelevant to grid anti-islanding protection. When islanding occurs, the anti islanding protection relay and anti islanding protection solar inverter form a dual backup to quickly disconnect the islanded power source and eliminate risks.
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