Description
Overview of Micom Generator Protection Relay
- Micom Generator Protection Relay belongs to generator protective relays, which is suitable for differential and backup protection of small generators, as well as protection for hydro-generators up to 2 MW and turbine generators up to 10 MW.
Features and Specifications
- Differential Instantaneous Trip （Trip）
- Percentage Differential Protection （Trip）
- Excessive Differential Current （Alarm）
- Three-stage Overcurrent Protection （Trip）
- Inverse-time Overcurrent （Trip; Normal / Severe / Extreme mode optional）
- Overload Protection （Alarm / Trip optional）
- Two-stage Negative Sequence Overcurrent Protection （Stage I: Trip; Stage II: Alarm / Trip optional）
- Inverse-time Negative Sequence Overcurrent （Trip）
- Three-stage Zero-sequence Overcurrent （Stage I/II: Trip; Stage III: Alarm / Trip optional）
- Loss of Excitation Protection （Trip）
- Reverse Power Protection （Trip）
- Overfrequency Protection （Trip）
- Underfrequency Protection （Trip）
- Overvoltage Protection （Trip）
- Undervoltage Protection （Alarm / Trip optional, with current blocking）
- Zero-sequence Overvoltage Protection （Alarm / Trip optional）
- PT Circuit Disconnection （Alarm）
- CT Circuit Disconnection （Alarm）
- Control Circuit Disconnection （Alarm）
- Non-electrical Quantity Protection （Alarm / Trip optional）
- PT Voltage Loss （Alarm）
- System Power Loss （Alarm / Trip optional）
Generator Protection Relay Numbers(ANSI):
- 87/87G/50/51/49/46/50N/51N/40/32/81O/81U/59/27/59N/60/63/27
Measurement and Control Functions
- Busbar voltage: Ua, Ub, Uc, Uab, Ubc, Uca;
- Measured current: Ia, Ic;
- Power: P, Q, COSφ;
- Frequency: f;
- Electric energy: EP+, EP-, EQ+, EQ-;
- Supports 21-channel active binary inputs (AC/DC 220V, DC 100V or DC 48V; voltage level shall be specified when ordering);
- Equipped with 11 protection output channels, 2 signal output channels, 1 closing position signal output channel, and 1 device power-loss output channel.
Communication Functions
-
Communication Interfaces:
2 Ethernet ports
2 RS485 ports; the second RS485 port is multiplexed with the time synchronization port, supporting either communication or time synchronization via configuration setting.
-
Communication Protocols: IEC-103/IEC-61850/Modbus
Time Synchronization Functions
- Supports time synchronization via communication message, SNTP and IRIG-B.
Printing Functions
- The device supports dot-matrix printers with serial communication capabilities and can print set values, event logs, and waveform recording events. Translation
Generator Protection Relay Settings
| No. | Setting Name | Setting Range | Unit | Default Value | Remarks |
|---|---|---|---|---|---|
| 1 | Differential Starting Current | 0.1–100 | A | 1 | |
| 2 | Differential Instantaneous Setting | 0.1–100 | A | 5 | |
| 3 | Inflection Point Setting | 0.1–100 | A | 1 | |
| 4 | Ratio Restraint Coefficient | 0.1–0.9 | — | 0.5 | |
| 5 | Generator Rated Current | 0.1–100 | A | 5 | |
| 6 | Overcurrent Stage I Setting | 0.1–100 | A | 8 | |
| 7 | Overcurrent Stage II Setting | 0.1–100 | A | 7 | |
| 8 | Overcurrent Stage II Time Delay | 0–100 | S | 0.5 | |
| 9 | Overcurrent Stage III Setting | 0.1–100 | A | 5 | |
| 10 | Overcurrent Stage III Time Delay | 0–100 | S | 1 | |
| 11 | Undervoltage Blocking Current Setting | 1–400 | V | 70 | |
| 12 | Negative Voltage Blocking Current Setting | 1–400 | V | 10 | |
| 13 | Inverse-time Overcurrent Setting | 0.1–100 | A | 5 | |
| 14 | Inverse-time Overcurrent Time Delay | 0–100 | S | 1 | |
| 15 | Inverse-time Overcurrent Type | 0–3 | — | 1 | 1=Normal, 2=Severe, 3=Extreme |
| 16 | Overload Setting | 0.1–100 | A | 5 | |
| 17 | Overload Time Delay | 0–100 | S | 2 | |
| 18 | Overload Type | 0–2 | — | 1 | 0=Exit, 1=Trip, 2=Alarm |
| 19 | Negative Sequence Overcurrent Stage I Setting | 0.1–100 | A | 2 | |
| 20 | Negative Sequence Overcurrent Stage I Time Delay | 0–100 | S | 1 | |
| 21 | Negative Sequence Overcurrent Stage II Setting | 0.1–100 | A | 1 | |
| 22 | Negative Sequence Overcurrent Stage II Time Delay | 0–100 | S | 2 | |
| 23 | Negative Sequence Overcurrent Stage II Type | 0–2 | — | 1 | 0=Exit, 1=Trip, 2=Alarm |
| 24 | Negative Sequence Inverse-time Overcurrent Setting | 0.1–100 | A | 5 | |
| 25 | Negative Sequence Inverse-time Overcurrent Time Delay | 0–100 | S | 1 | |
| 26 | Negative Sequence Inverse-time Overcurrent Type | 0–3 | — | 1 | 1=Normal, 2=Severe, 3=Extreme |
| 27 | Zero-sequence Overcurrent Stage I Setting | 0.1–100 | A | 2 | |
| 28 | Zero-sequence Overcurrent Stage I Time Delay | 0–100 | S | 0.2 | |
| 29 | Zero-sequence Overcurrent Stage II Setting | 0.1–100 | A | 2 | |
| 30 | Zero-sequence Overcurrent Stage II Time Delay | 0–100 | S | 1 | |
| 31 | Zero-sequence Overcurrent Stage III Setting | 0.1–100 | A | 2 | |
| 32 | Zero-sequence Overcurrent Stage III Time Delay | 0–100 | S | 2 | |
| 33 | Zero-sequence Overcurrent Stage III Type | 0–2 | — | 1 | 0=Exit, 1=Trip, 2=Alarm |
| 34 | Zero-voltage Blocking Zero-sequence Setting | 1–400 | V | 5 | |
| 35 | Loss of Excitation Impedance Setting A | 0–100 | — | 1 | |
| 36 | Loss of Excitation Impedance Setting B | 0.2–200 | — | 20 | |
| 37 | Loss of Excitation Protection Time Delay | 0–100 | S | 1 | |
| 38 | Undervoltage Blocking Loss of Excitation Setting | 1–400 | V | 10 | |
| 39 | Reverse Power Protection Setting | 0–600 | W | 50 | |
| 40 | Reverse Power Time Delay | 0–100 | S | 1 | |
| 41 | Overvoltage Setting | 1–600 | V | 120 | |
| 42 | Overvoltage Time Delay | 0–100 | S | 0.5 | |
| 43 | Undervoltage Setting | 1–400 | V | 80 | |
| 44 | Undervoltage Time Delay | 0–100 | S | 1 | |
| 45 | Zero-sequence Overvoltage Setting | 1–400 | V | 30 | |
| 46 | Zero-sequence Overvoltage Time Delay | 0–100 | S | 0.5 | |
| 47 | Zero-sequence Overvoltage Type | 0–2 | — | 1 | 0=Exit, 1=Trip, 2=Alarm |
| 48 | Overfrequency Protection Setting | 35–65 | Hz | 51 | |
| 49 | Overfrequency Protection Time Delay | 0–100 | S | 0.5 | |
| 50 | Underfrequency Protection Setting | 35–60 | Hz | 49 | |
| 51 | Underfrequency Protection Time Delay | 0–100 | S | 0.5 | |
| 52 | Undervoltage Blocking Frequency Setting | 1–400 | V | 20 | |
| 53 | Slip Blocking Frequency Setting | 1–30 | Hz/S | 3 | |
| 54 | PT Disconnection Time Delay | 0–100 | S | 5 | |
| 55 | PT Voltage Loss Time Delay | 0–100 | S | 5 | |
| 56 | Control Circuit Disconnection Time Delay | 0–100 | S | 10 | |
| 57 | System Power Loss Type | 0–2 | — | 1 | 0=Exit, 1=Trip, 2=Alarm |
| 58 | Thermal/Hydraulic Accident Type | 0–2 | — | 1 | |
| 59 | Thermal/Hydraulic Accident Time Delay | 0–100 | S | 0.1 | |
| 60 | Excitation Fault Type | 0–2 | — | 1 | |
| 61 | Excitation Fault Time Delay | 0–100 | S | 0.1 | |
| 62 | Electrical Accident Type | 0–2 | — | 1 | |
| 63 | Electrical Accident Time Delay | 0–100 | S | 0.1 |
Note: Refer to the manual for generator protection relay setting calculation instructions.
Outline and Installation Dimensions
FAQ
Q：which relay is used for generator protection？
A:Generator out of step protection relays, reverse power relay for generator protection, three-stage generator current protection, generator loss-of-field protection, generator rotor protection relay,generator differential protection, etc.
Q：which relay is used for generator protection？
A:The generator protection relay price is generally around 6,000 RMB, with higher-specification models costing more.
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