Description
Main Functions
1.2.1 Device Functions
- Two-stage under-frequency / over-frequency protection: settings and time can be independently adjusted. Independent control word for enabling the function; can also be used for under-frequency tripping, over-frequency generator rejection, or under-frequency automatic start of backup units.
- Two-stage under-voltage / over-voltage protection: settings and time can be independently adjusted for each stage. Each stage has an independent control word; can be used for under-voltage/over-voltage tripping, under-voltage automatic start of backup units, or over-voltage generator rejection.
- Slip blocking function: blocks device output when slip exceeds the set value.
- Voltage-check closing function: allows automatic closing when voltage is detected.
- Two-stage reverse power protection
- Frequency sudden-change protection
- Three-stage overcurrent protection
- Zero-sequence current protection
1.2.2 Measurement Functions
- Measures bus frequency and rate of change of frequency (df/dt) at the installation point.
- Measures bus voltage and rate of change of voltage (dv/dt) at the installation point.
1.2.3 Device Self-test Function
- Automatically detects faults in RAM, ROM, A/D converter, etc.
- Automatically checks setting values, configurations, coefficients and other parameters.
- Equipped with power failure alarm function.
1.2.4 Event Recording Function
- Records events including protection operations, alarms and device self-test faults.
- Records the type and operating time of protection events, as well as the type and occurrence time of self-test faults.
1.2.5 Communication Function
- The device is equipped with an RS485 communication interface for connection with the monitoring system.
- Supports two communication protocols:
- ATN-101 protocol, MODBUS (custom protocol by Beijing Antongni Electronic Technology Co., Ltd.)
- IEC60870-5-103 protocol
1.2.6 Monitoring Function
- Displays voltage and frequency.
- Collects position signals of circuit breakers, isolating switches and other digital inputs.
1.2.7 Display & Operation Function
- The panel is equipped with a large-screen LCD for Chinese character display and keyboard operation, enabling convenient data monitoring, online setting modification and protection enabling/disabling.
- A corresponding fault screen pops up automatically when a fault occurs.
- The panel is also equipped with indicators for operation, abnormality, alarm, under-voltage, under-frequency and standby status.
1.3 Main Features of the Device
1.3.1 High-performance Hardware System
The device adopts a 32-bit microprocessor with an independent hardware watchdog. The high-performance hardware system ensures strong data processing capability.
1.3.2 Multifunctional Hardware Platform
The device integrates protection, signaling and remote control functions in one unit.
1.3.3 Comprehensive Protection Design
The device has independent protection (or alarm) output, with operation memory and signal latching function. The protection principle is mature and reliable for long-term field operation.
1.3.4 Complete Event Recording
The device is equipped with large-capacity ferroelectric RAM (FRAM) that stores operation, alarm and fault records without data loss after power failure.
1.3.5 Comprehensive Self-test
Self-test functions include A/D self-test, setting self-test, coefficient self-test, configuration self-test, tele-signaling self-test and communication self-test, ensuring timely fault detection and reliable operation.
1.3.6 Accurate Real-time Clock System
The built-in clock retains data after power failure.
2. Main Technical Data
2.1 Rated DC Data
a) Voltage: 220V, 110V (to be specified when ordering)
b) DC voltage ripple factor ≤ 2%; allowable voltage fluctuation: 80%~115% of rated voltage.
2.2 Rated AC Data
a) AC voltage: 100V
b) Frequency fn: 50Hz
2.3 Measurement Accuracy
a) Frequency measurement error: < ±0.01Hz (45~55Hz)
b) Voltage RMS error: < ±1% (0.2~1.2Un)
c) df/dt measurement error: < 0.1Hz/s
d) Time delay error: < 0.02s
2.4 AC Power Consumption
AC voltage circuit: < 0.5VA per phase under rated conditions.
2.5 Insulation Performance
- Insulation resistance: ≥ 500MΩ between all circuits and the enclosure under standard test conditions.
- Dielectric strength: withstands AC 50Hz, 2kV (RMS) for 1 minute without breakdown or flashover. For re-test, use 75% of the rated voltage.
2.6 Impulse Voltage
Complies with GB/T 15145-2001.
2.7 Anti-interference Capability
The device meets 14 IEC electromagnetic compatibility standards.
2.8 Mechanical Performance
- Operating conditions: withstands vibration response and shock response tests at severity Level I.
- Transportation conditions: withstands vibration endurance, shock and bump tests at severity Level I.
2.9 Environmental Conditions
2.9.1 Normal Operating Conditions
Ambient temperature: -10℃ ~ +50℃
Relative humidity: ≤ 95%, no condensation.
2.9.2 Limit Temperature for Storage & Transportation
Temperature range: -25℃ ~ +70℃. No irreversible damage without excitation; device operates normally after temperature recovery.
Atmospheric pressure for packaged devices: 80~110kPa (altitude ≤ 2,000m).
2.9.3 Surroundings
The installation site shall be free of explosion hazards, corrosive gases, conductive dust and severe mold. Protection against rain, snow, wind, sand, dust and static electricity shall be provided.
3. Main Function Data
- Voltage setting range: 5~120.00V
- Frequency setting range: 45.00~55.00Hz
- Time setting range:
- Under-frequency protection: 0.1s~120.00s
- Under-voltage protection: 0.1s~120.00s
Setting Errors
- Voltage setting error: ≤ ±3%
- Frequency setting error: ≤ ±0.02Hz
Operating Time
- < 1s: average error ≤ 35ms
-
1s: average error ≤ ±2.5%
Tele-signal Resolution
≤ 2ms
Application Scope
The ASF-512 Anti-Islanding Protection Device is a new-generation product independently developed and manufactured by our company, mainly used to prevent islanding effects in the power grid.
Islanding is an electrical condition in which a part of the grid is disconnected from the main grid but remains energized by a photovoltaic (PV) system. This poses risks to public and utility maintenance personnel and degrades power quality, so anti-islanding devices are mandatory in PV power stations.
The device is mainly applicable to small power grid-connected systems in 10kV and low-voltage 380V PV power stations.
When islanding occurs, it quickly trips the grid connection point to separate the station from the grid, ensuring the safety of the entire power station and maintenance personnel.
The ASF-512 features a simple structure, easy operation, high reliability, compact size, convenient installation and user-friendly replacement.
Reviews
There are no reviews yet.