Description
Overview of Reverse Power Protection Relay
- For photovoltaic power plants adopting a non-reversible grid connection design, a Reverse Power Protection Relay shall be installed at the grid connection point.
- This system adopts a dedicated microprocessor unit and control circuitry to real-time monitor the low-voltage side of distribution transformers. Integrated with reverse power relay protection, it implements precise control for clean power supply and ensures fast protection response.
Reverse Power Protection Relay Functions
- Three-stage current protection
- Instantaneous overcurrent
- Definite-time instantaneous overcurrent
- Undervoltage blocking
- Directional blocking
- individually enabled or disabled
- Six-stage time-limit
- reverse power protection
- PT fuse failure detection
Key Technical Specifications of Reverse Power Protection Relays
Rated Specifications
- Power Supply: AC 220 V or AC 110 V (specify when ordering)
- AC Voltage: Phase voltage 220 V, line voltage 380 V
- AC Current: 5 A or 1 A (specify when ordering)
- Frequency: 50 Hz
Power consumption:
- DC circuit: ≤15 W
- AC voltage circuit: < 0.5 VA per phase
- AC current circuit: < 1 VA per phase (IN = 5 A) or < 0.5 VA per phase (IN = 1 A)
Standard atmospheric conditions
Standard atmospheric conditions
- Operating conditions: –20°C to +70°C, relative humidity 5% to 95% (no condensation or freezing inside the unit);
- Storage: –30°C to +80°C. When no excitation is applied at the extreme temperature limits, the device shall not undergo irreversible changes, and it shall function normally once the temperature returns to normal. Packaged devices shall be stored at an atmospheric pressure of 80–110 kPa (equivalent to an altitude of 2 km or less) and a relative humidity of no more than 85%.
- Transportation: -25°C to +70°C, relative humidity not exceeding 85%;
Other requirements
- The air around the equipment must not contain any acidic, alkaline, corrosive, or explosive substances.
Overview of Key Features
- The ASW-441H reverse power monitoring device is equipped with reverse power trip and reverse power recovery functions, as follows:
- Six-time-delay graded trip based on reverse power; (any given time delay can be linked via hardware to a pair of output contacts C01–C02)
- The 1st time delay trips 1DL; the 2nd through 5th time delays all trip the corresponding switches after the preceding time delay has tripped; the 6th time delay trips 6DL after the 5th time delay has tripped, and it is also possible to select whether to trip the 10kV switch.
- Six-time-delay graded closing based on power restoration.Time step 1 closes 1DL; time steps 2–6 close the corresponding switches after the previous time step has closed.
- The 10kV switch must be closed manually.
- Measurements: U, I, P, Q, cosΦ, F.
Reverse Power Flow Protection Relay Setting Sheet
| No. | Display Name | Range | Step | Remarks |
|---|---|---|---|---|
| 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 Time Delay | 0～120.00s | 0.01s | — |
| 1.3 | Stage 1 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 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 Time Delay | 0～120.00s | 0.01s | — |
| 2.3 | Stage 2 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 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 Time Delay | 0～120.00s | 0.01s | — |
| 3.3 | Stage 3 Setting Value | 0.40～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 4 | Reverse Power Protection Enable/Disable | |||
| 4.1 | 6-stage Time-limit 10kV Inter-tripping Enable/Disable | 1/0 | — | 10kV inter-tripping: Enable(1) / Disable(0) |
| 4.2 | Reverse Power P Setting Value | 0.05～0.2 Pn | 0.01 | 0.05～0.2 Pn |
| 4.3 | 1st Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 4.4 | 2nd Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 4.5 | 3rd Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 4.6 | 4th Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 4.7 | 5th Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 4.8 | 6th Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5 | Power Recovery Setting | |||
| 5.1 | 1st Time-limit Power Recovery Closing Enable/Disable | 1/0 | — | 1st time-limit power recovery closing: Enable(1) / Disable(0) |
| 5.2 | 2nd Time-limit Power Recovery Closing Enable/Disable | 1/0 | — | 2nd time-limit power recovery closing: Enable(1) / Disable(0) |
| 5.3 | 3rd Time-limit Power Recovery Closing Enable/Disable | 1/0 | — | 3rd time-limit power recovery closing: Enable(1) / Disable(0) |
| 5.4 | 4th Time-limit Power Recovery Closing Enable/Disable | 1/0 | — | 4th time-limit power recovery closing: Enable(1) / Disable(0) |
| 5.5 | 5th Time-limit Power Recovery Closing Enable/Disable | 1/0 | — | 5th time-limit power recovery closing: Enable(1) / Disable(0) |
| 5.6 | 6th Time-limit Power Recovery Closing Enable/Disable | 1/0 | — | 6th time-limit power recovery closing: Enable(1) / Disable(0) |
| 5.7 | 1st Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5.8 | 2nd Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5.9 | 3rd Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5.10 | 4th Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5.11 | 5th Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5.12 | 6th Time Limit T | 0～120.00s | 0.01s | 0.01s |
| 5.13 | Power Recovery Closing Setting 1 | 0.05～0.2 Pn | 0.01 | — |
| 5.14 | Power Recovery Closing Setting 2 | 0.05～0.2 Pn | 0.01 | — |
| 5.15 | Power Recovery Closing Setting 3 | 0.05～0.2 Pn | 0.01 | — |
| 5.16 | Power Recovery Closing Setting 4 | 0.05～0.2 Pn | 0.01 | — |
| 5.17 | Power Recovery Closing Setting 5 | 0.05～0.2 Pn | 0.01 | — |
| 5.18 | Power Recovery Closing Setting 6 | 0.05～0.2 Pn | 0.01 | — |
| 6 | Overvoltage Protection Setting | |||
| 6.1 | Overvoltage Protection Enable/Disable | 1/0 | — | — |
| 6.2 | Overvoltage Time Delay | 0～120.00s | 0.01s | 0.01s |
| 6.3 | Overvoltage Setting Value | 0～120.00V | 0.01V | 0.01V |
| 7 | Undervoltage Protection Setting | |||
| 7.1 | Undervoltage Protection Enable/Disable | 1/0 | — | — |
| 7.2 | Undervoltage Time Delay | 0～120.00s | 0.01s | 0.01s |
| 7.3 | Undervoltage Setting Value | 0～100.00V | 0.01V | 0.01V |
| 8 | General Setting | |||
| 8.1 | PT Fuse Failure Detection Enable/Disable | 1/0 | — | PT fuse failure detection: Enable(1) / Disable(0) |
| 8.2 | 3-phase 4-wire Voltage Wiring | 1/0 | — | 3-phase 4-wire(1) / 3-phase 3-wire(0) |
| 8.3 | Rated Current | 1/0 | — | 1A rated(1) / 5A rated(0) |
Outline and Installation Dimensions
FAQ
Q：What is the difference between reverse power relay for generator protection adopted in power plant generators and reverse power protection relay for solar used in photovoltaic power generation projects in terms of backflow protection principle, setting logic and application scenarios?
A:Photovoltaic backflow protection prevents excess power from being fed back into the grid when power generation exceeds the load (a policy-driven power flow control measure achieved by limiting inverter output or tripping the circuit).
Generator backflow protection (reverse power protection) prevents a generator from operating in motor mode and drawing active power from the system in the event of demagnetization or accidental closure of the main steam valve, which could cause overheating and damage to the turbine blades (an emergency trip protection measure driven by equipment safety).
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