Description
What is a generator protection panel?
- The generator protection relay panel (also known as generator protection measurement and control panel or generator control panel) is a core electrical device in the power system. It is specially designed to monitor, control, protect and measure the operating status of generator sets, serving as a dedicated protection cabinet for generators.
Generator protection relay types
Differential protection generator 87G
- Fast tripping for generator internal faults (inter-turn short circuit, inter-phase short circuit, etc.), featuring differential instantaneous overcurrent + proportional differential protection (with second harmonic restraint and CT disconnection blocking).
Generator differential protection relay setting calculation
- Based on the CT ratio parameters at the motor end and the motor tail, the device performs a balancing conversion on the phase currents on each side in the differential current calculation, converting the current on the motor tail side to match the current on the motor end.
- Differential Current Two-Segment Balanced Conversion
Generator Backup Protection Relay
- Protects external faults beyond the generator outlet. Functions include: three-stage overcurrent protection, composite voltage locked overcurrent protection, negative sequence overcurrent protection, and overexcitation protection.
Generator Ground Fault Protection Relay
- Generator Rotor Grounding Relay Protection, which monitors ground faults in the rotor windings. Functions include: single-point rotor grounding (alarm) + two-point rotor grounding (trip)
Generator Monitoring and Control System
- The device is designed for real-time monitoring and remote control. It measures voltage, current, frequency, power, power factor, and energy consumption, and supports remote control and remote signaling.
Generator protection relay list
| Protection Classification | Chinese Protection Name | Professional English Terminology (Power Standard) |
|---|---|---|
| 1. Generator Main Protection | Generator Percentage Differential Protection (Second Harmonic Restraint, CT Disconnection Blocking) | Generator Percentage Differential Protection (Second Harmonic Restraint, CT Disconnection Blocking) |
| 1. Generator Main Protection | Generator Differential Instantaneous Trip Protection | Generator Differential Instantaneous Trip Protection |
| 1. Generator Main Protection | Stator Inter-turn Short Circuit Protection | Stator Inter-turn Short Circuit Protection |
| 1. Generator Main Protection | Fast Tripping Protection for Generator Internal Faults | Fast Tripping Protection for Generator Internal Faults |
| 2. Generator Backup Protection | Three-stage Overcurrent Protection | Three-stage Overcurrent Protection |
| 2. Generator Backup Protection | Composite Voltage Blocked Overcurrent Protection | Composite Voltage Blocked Overcurrent Protection |
| 2. Generator Backup Protection | Negative Sequence Overcurrent Protection | Negative Sequence Overcurrent Protection |
| 2. Generator Backup Protection | Backup Protection for Generator External Faults | Backup Protection for Generator External Faults |
| 3. Operating Condition & Abnormity Protection | Overexcitation Protection | Overexcitation Protection |
| 3. Operating Condition & Abnormity Protection | Underexcitation Protection | Underexcitation Protection |
| 3. Operating Condition & Abnormity Protection | Overvoltage Protection | Overvoltage Protection |
| 3. Operating Condition & Abnormity Protection | Undervoltage Protection | Undervoltage Protection |
| 3. Operating Condition & Abnormity Protection | Stator Ground Fault Protection | Stator Ground Fault Protection |
| 3. Operating Condition & Abnormity Protection | Rotor Ground Fault Protection | Rotor Ground Fault Protection |
| 3. Operating Condition & Abnormity Protection | Stator Overload Protection | Stator Overload Protection |
| 3. Operating Condition & Abnormity Protection | Rotor Overload Protection | Rotor Overload Protection |
| 3. Operating Condition & Abnormity Protection | Reverse Power Protection | Reverse Power Protection |
| 3. Operating Condition & Abnormity Protection | Loss of Excitation Protection | Loss of Excitation Protection |
Generator Protection Relay Panel – Scope of Application
- Thermal power plants, hydroelectric power stations, diesel generator sets, etc.
Generator protection relay codes
- 87G,87H,64S,64R,51,51V,46,24,40,59,27,49,32
Generator protection relay testing
| No. | Transmission Item | Operation Mode | Verification Content |
|---|---|---|---|
| 1 | Differential Protection Transmission | Simulate current difference between generator terminal and neutral point | Differential protection operates → tripping and signal indication are correct |
| 2 | Stator Ground Fault Protection Transmission | Apply zero-sequence voltage / third harmonic voltage | Ground fault protection operates → tripping / alarm output |
| 3 | Loss of Excitation Protection Transmission | Simulate impedance entering operating zone | Loss of excitation → time-delay tripping |
| 4 | Negative Sequence Overcurrent Protection Transmission | Apply unbalanced current | Alarm output → tripping action |
| 5 | Overvoltage Protection Transmission | Apply 1.3 times rated voltage | Overvoltage detected → time-delay tripping |
| 6 | Main Transformer / Auxiliary Transformer Inter-tripping | Simulate transformer fault | Inter-trip main circuit breaker |
| 7 | Non-electrical Quantity Protection Transmission | Simulate gas protection / temperature / vibration signal | Tripping and signal output normally |
FAQ
Q：How to choose a generator protection relay panel, and what technical parameters to consider？
A:For Generator Protection Relay Panel, the following factors shall be considered during model selection: protection configurations (differential, loss-of-excitation, ground fault, etc.), rated parameters (current and voltage, CT and PT transformation ratios), operating accuracy (≤5%), time accuracy (≤20 ms), insulation class, communication protocols, and the manufacturer’s track record.
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