Description
Functions
- Three-stage current protection: including instantaneous trip, time-delayed instantaneous trip and overcurrent protection. All three stages are equipped with under-voltage blocking and directional blocking functions, and can be enabled or disabled independently.
- Six-stage inverse-time reverse power protection with trip output (Note: The six time limits must be set differently for step-by-step tripping).
- Six-stage reverse power restoration function (Note: The six time limits must be set differently for step-by-step restoration).
- Under-voltage protection: alarm
- Over-voltage protection: alarm
- PT wire break detection.
2. Main Features of ASW-441 Reverse Power Monitoring Device
The device can be assembled in a centralized panel or installed locally and dispersedly on switchgears. Each bay functions independently, and devices are connected only via network for information sharing, making the whole system highly flexible and reliable. A fault in any single device only affects one local component.
It adopts a high-performance processor and high-resolution A/D converter, combined with a dedicated measuring CT, ensuring high precision of telemetry data.
The protection functions are completely independent of the communication network; network failure will not affect normal protection operation.
The device is fully sealed and equipped with carefully designed anti-interference components, greatly improving vibration resistance and electromagnetic interference immunity.
It is designed with a watchdog function, enabling the whole system to achieve both high measurement accuracy and strong anti-interference performance.
Friendly human-machine interface with a full Chinese large-screen LCD display. Trip reports, alarm reports, remote signaling, telemetry and setting adjustment are all clearly displayed in Chinese characters for easy operation and mastery.
Communication modes include CAN, RS485 or Ethernet, to be specified by the user when ordering.
3. Main Technical Data of ASW-441 Reverse Power Monitoring Device
3.1 Rated Data
a. Device power supply: AC220V or AC110V (to be specified when ordering)
b. AC voltage: phase voltage 220V, line voltage 380V
c. AC current: 5A (1A version available upon request)
d. Frequency: 50Hz
3.2 Power Consumption
a. DC circuit: ≤ 15W
b. AC voltage circuit: < 0.5VA/phase
c. AC current circuit: < 1VA/phase (In=5A) or < 0.5VA/phase (In=1A)
3.3 Accurate Operating Range
a. Current: 0 ~ 1.2In
b. Voltage: 0V ~ 120V
c. Frequency: 45Hz ~ 50Hz
3.4 Setting Error
a. Current and voltage setting error: < ±3% of set value
b. Time setting error: < ±1% of set time ±35ms
3.5 Measurement Error Range
a. Frequency: 0.1%
b. Current, voltage: 0.5%
c. Rated active and reactive power: ±0.5%
3.6 Remote Signaling Event Recording Resolution: ≤ 2ms
3.7 Remote Control Accuracy: ≥ 99.99%
3.8 Insulation Performance
Application Scope
When a photovoltaic power station is designed for non-reversible grid connection, reverse power protection equipment shall be installed at the grid connection point.
This device uses a specially designed microprocessor unit and control circuit to monitor the low-voltage side of the distribution transformer in real time and implement necessary control over clean energy sources, ensuring fast protection operation and accurate control.
Note: A clean energy grid-connected power system operates in parallel with the public power distribution system (supplied by a 10kV/0.4kV distribution transformer). Due to special requirements for load change control, the power supply department must ensure power quality and reliability for users while enabling normal operation of clean energy sources.
On the other hand, the operation of clean energy sources shall not affect the safety of the distribution system, and reverse power transmission from clean energy sources to the power system through the distribution transformer is not allowed. Therefore, safe control of clean energy sources is required to fully realize their economic benefits, demonstration and experimental functions, use clean energy power scientifically and rationally, and reduce users’ electricity costs.
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