Description
- The System Separation Protection (78) Device is a new-generation product independently developed and manufactured by our company. It is suitable for substations or interconnections operating with small power sources connected to medium- and low-voltage grids.
- In the event of a grid fault, the device can quickly and reliably disconnect the small power sources from the grid to ensure the restoration of power supply from the main source and guarantee the safe and stable operation of the grid system.
- It features functions such as low-frequency disconnection, low-voltage disconnection, over-frequency disconnection, busbar overvoltage disconnection, zero-sequence overvoltage disconnection, and loss-of-synchronism disconnection.
Product Functions (ANSI)
- Frequency relay｜81
- Undervoltage relay｜27
- Overvoltage relay ｜59
- System separation relay ｜78
- Neutral overvoltage relay｜59N
- Instantaneous Overcurrent｜50
- Time Delayed Overcurrent｜51
Communication Mode
- Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103)
Main Functional Specifications
- Protection response time (including the response time of the output relay): Average error in response time: not more than 35 ms;
- Precision operating range: Minimum precision current: 0.08 In, Maximum precision current: 20 In
- Current setting error: When the current exceeds 1.00 A, the error shall not exceed ±2.5%; Voltage setting error: shall not exceed ±3%
- Measurement accuracy: Current (I)/Voltage (U): Class 0.2; Power (P)/Reactive power (Q): Class 0.5
- Remote signal resolution: no more than 2 ms
Event Logging, Fault Recording
- The recorded events include protective action events and device malfunctions;
- Record the type of protection trip, the time of the trip, and the operating parameters at the time of the trip;
- The fault recording data includes: the time of the protection operation, the type of protection operation, and the rms values before and after the recording was initiated;
- Data length of the fault recording: 2 cycles before the fault and 4 cycles after the fault;
- The SOE can retain 48 sets of data after a power loss, and the fault report can retain 16 sets of data after a power loss.
Monitoring Features
- The device is capable of measuring analog quantities such as current, voltage, and frequency;
- Collect position signals from circuit breakers, energy storage systems, isolating switches, and remote/local control switches, as well as other digital signals;
- Control functions of the disconnect switch.
Setting Table
| No. | Display Name | Range | Step | Remark |
|---|---|---|---|---|
| 1 | Stage I Protection Setting | |||
| 1.1 | Stage I Protection Enable | 1/0 | — | Stage I protection: Enable(1) / Disable(0) |
| 1.2 | Stage I Composite Voltage Blocking | 1/0 | — | Stage I composite voltage blocking: Enable(1) / Disable(0) |
| 1.3 | Stage I Directional Blocking | 1/0 | — | Stage I directional blocking: Enable(1) / Disable(0) |
| 1.4 | Stage I Time Delay | 0.00～120.00s | 0.01s | |
| 1.5 | Stage I Setting Value | 0.10～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 2 | Stage II Protection Setting | |||
| 2.1 | Stage II Protection Enable | 1/0 | — | Stage II protection: Enable(1) / Disable(0) |
| 2.2 | Stage II Composite Voltage Blocking | 1/0 | — | Stage II composite voltage blocking: Enable(1) / Disable(0) |
| 2.3 | Stage II Directional Blocking | 1/0 | — | Stage II directional blocking: Enable(1) / Disable(0) |
| 2.4 | Stage II Time Delay | 0.00～120.00s | 0.01s | |
| 2.5 | Stage II Setting Value | 0.10～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 3 | Stage III Protection Setting | |||
| 3.1 | Stage III Protection Enable | 1/0 | — | Stage III protection: Enable(1) / Disable(0) |
| 3.2 | Stage III Composite Voltage Blocking | 1/0 | — | Stage III composite voltage blocking: Enable(1) / Disable(0) |
| 3.3 | Stage III Directional Blocking | 1/0 | — | Stage III directional blocking: Enable(1) / Disable(0) |
| 3.4 | Stage III Time Delay | 0.00～120.00s | 0.01s | |
| 3.5 | Stage III Setting Value | 0.10～99.99A
0.10～20.00A |
0.01A | In=5A
In=1A |
| 4 | Two-stage Underfrequency Setting | |||
| 4.1 | Underfrequency Stage I Enable | 1/0 | — | Underfrequency stage I: Enable(1) / Disable(0) |
| 4.2 | Underfrequency Stage II Enable | 1/0 | — | Underfrequency stage II: Enable(1) / Disable(0) |
| 4.3 | Undervoltage Blocking for Underfrequency | 1/0 | — | Undervoltage blocking underfrequency: Enable(1) / Disable(0) |
| 4.4 | df/dt Blocking for Underfrequency | 1/0 | — | Slip frequency blocking underfrequency: Enable(1) / Disable(0) |
| 4.5 | Startup Time Delay | 0.00～120.00s | 0.01s | |
| 4.6 | Stage I Time Delay | 0.00～120.00s | 0.01s | |
| 4.7 | Stage II Time Delay | 0.00～120.00s | 0.01s | |
| 4.8 | Startup Setting Value | 46.00～50.00Hz | 0.01Hz | |
| 4.9 | Stage I Setting Value | 46.00～50.00Hz | 0.01Hz | |
| 4.10 | Stage II Setting Value | 46.00～50.00Hz | 0.01Hz | |
| 4.11 | df/dt2 Setting | 0.50～99.99V/s | 0.01V/s | Slip frequency blocking setting |
| 5 | Two-stage Overfrequency Setting | |||
| 5.1 | Overfrequency Stage I Enable | 1/0 | — | Overfrequency stage I: Enable(1) / Disable(0) |
| 5.2 | Overfrequency Stage II Enable | 1/0 | — | Overfrequency stage II: Enable(1) / Disable(0) |
| 5.3 | Undervoltage Blocking for Overfrequency | 1/0 | — | Undervoltage blocking overfrequency: Enable(1) / Disable(0) |
| 5.4 | Stage I Time Delay | 0.00～120.00s | 0.01s | |
| 5.5 | Stage II Time Delay | 0.00～120.00s | 0.01s | |
| 5.6 | Stage I Setting Value | 50.00～55.00Hz | 0.01Hz | |
| 5.7 | Stage II Setting Value | 50.00～55.00Hz | 0.01Hz | |
| 6 | Two-stage Undervoltage Setting | |||
| 6.1 | Undervoltage Stage I Enable | 1/0 | — | Undervoltage stage I: Enable(1) / Disable(0) |
| 6.2 | Undervoltage Stage II Enable | 1/0 | — | Undervoltage stage II: Enable(1) / Disable(0) |
| 6.3 | Undervoltage Blocking for Splitting | 1/0 | — | Undervoltage blocking splitting: Enable(1) / Disable(0) |
| 6.4 | Startup Time Delay | 0.00～120.00s | 0.01s | |
| 6.5 | Stage I Time Delay | 0.00～120.00s | 0.01s | |
| 6.6 | Stage II Time Delay | 0.00～120.00s | 0.01s | |
| 6.7 | Startup Setting Value | 0.10～100.00V | 0.01V | |
| 6.8 | Stage I Setting Value | 0.10～100.00V | 0.01V | |
| 6.9 | Stage II Setting Value | 0.10～100.00V | 0.01V | |
| 6.10 | Undervoltage Blocking Value | 0.10～100.00V | 0.01V | Block undervoltage splitting |
| 7 | Two-stage Overvoltage Setting | |||
| 7.1 | Overvoltage Stage I Enable | 1/0 | — | Overvoltage stage I: Enable(1) / Disable(0) |
| 7.2 | Overvoltage Stage II Enable | 1/0 | — | Overvoltage stage II: Enable(1) / Disable(0) |
| 7.3 | Stage I Time Delay | 0.00～120.00s | 0.01s | |
| 7.4 | Stage II Time Delay | 0.00～120.00s | 0.01s | |
| 7.5 | Stage I Setting Value | 0.10～120.00V | 0.01V | |
| 7.6 | Stage II Setting Value | 0.10～120.00V | 0.01V | |
| 8 | Two-stage Zero Voltage Setting | |||
| 8.1 | Zero Voltage Stage I Enable | 1/0 | — | Zero voltage stage I: Enable(1) / Disable(0) |
| 8.2 | Zero Voltage Stage II Enable | 1/0 | — | Zero voltage stage II: Enable(1) / Disable(0) |
| 8.3 | Zero Voltage Stage I Trip Mode | 1/0 | — | Trip(1) / Alarm(0) |
| 8.4 | Zero Voltage Stage II Trip Mode | 1/0 | — | Trip(1) / Alarm(0) |
| 8.5 | Stage I Time Delay | 0.00～120.00s | 0.01s | |
| 8.6 | Stage II Time Delay | 0.00～120.00s | 0.01s | |
| 8.7 | Stage I Setting Value | 0.10～100.00V | 0.01V | |
| 8.8 | Stage II Setting Value | 0.10～100.00V | 0.01V | |
| 9 | Out-of-step Splitting Setting | |||
| 9.1 | Out-of-step Splitting Enable | 1/0 | — | Out-of-step splitting: Enable(1) / Disable(0) |
| 9.2 | Out-of-step Voltage Setting | 0.10～120.00V | 0.10V | 0.5UN |
| 9.3 | Oscillation Times | 0~20 | — | Default:5 |
| 10 | Under-voltage Protection Setting | |||
| 10.1 | Under-voltage Protection Enable | 1/0 | — | Under-voltage protection: Enable(1) / Disable(0) |
| 10.2 | Under-voltage Setting Value | 0.10～120.00V | 0.01V | |
| 10.3 | Under-voltage Time Delay | 0.00～120.00s | 0.01s | |
| 11 | General Setting | |||
| 11.1 | VT Disconnection Detection | 1/0 | — | VT disconnection: Enable(1) / Disable(0) |
| 11.2 | Blocking Release on VT Fault | 1/0 | — | |
| 11.3 | VT Fault Block Splitting | 1/0 | — | |
| 11.4 | Undervoltage Adopt Phase Voltage | 1/0 | — | 1=Umin/Umax by phase voltage
0=Umin/Umax by line voltage |
| 11.5 | 3P4W Voltage Wiring | 1/0 | — | 1=3P4W
0=3P3W |
| 11.6 | Rated Voltage 380V | 1/0 | — | 1=380V system
0=100V system |
| 11.7 | Rated Current 1A | 1/0 | — | 1=1A input
0=5A input |
| 11.8 | Rated Current Setting | 1.00～99.99A | 0.01A | |
| 11.9 | Negative Sequence Voltage | 0.00～100.00V | 0.01V | |
| 11.10 | I-U Blocking Voltage | 0.00～100.00V | 0.01V | Blocking voltage for 3-stage overcurrent |
| 11.11 | F-U Blocking Voltage | 0.00～100.00V | 0.01V |
Outline and Installation Dimensions
FAQ
Q：In what types of projects are system separation protection devices primarily used?
A:System separation protection devices are primarily used in power generation projects, such as hydroelectric, thermal, and photovoltaic power plants. In the event of a fault on the generation side, these devices immediately isolate the faulty section to ensure the safety of the power grid.
Q：Where are system separation protection devices typically installed?
A:System separation protection devices are typically installed in parallel and are mainly located in the secondary distribution rooms of substations; however, they may sometimes be installed on high-voltage switchgear for grid connection depending on specific requirements.
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