Description
Product Overview
The AGP-441H digital generator differential protection relay | 87G protection device is applicable to generators with a capacity of 100MW and below for differential protection. Serving as the main protection of the generator, it is equipped with generator differential high-speed trip protection and generator differential protection functions, and can be adopted in cabinet integrated installation or distributed installation.
Product Functions (ANSI)
Generator Differential High-Set Protection（87GH）
- Phase-separated differential high-set protection, operating time ≤ 25ms.
Generator Differential Protection（87G）
- Phase-separated Generator Differential Protection
With CT open circuit detection and differential overcurrent alarming functions.
- It provides real-time CT open-circuit detection and can block the differential protection. An alarm is issued if the differential current exceeds the threshold during operation.
Communication Mode
- Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103)
Main Functional Specifications
Protection operating time (including output relay operating time)
- Average trip time error: ≤ 30 ms
Precise operating range
- Minimum accurate working current: 0.08In
- Maximum accurate working current: 20In
Setting error
- Differential protection current setting error: ≤±2.5% (Current＞1.00A)
- Differential high-set time setting error: ≤25 ms
- Differential protection time setting error: ≤30 ms
Telemetry Accuracy
- Voltage(U), Current(I): Class 0.2
- Active power(P), Reactive power(Q): Class 0.5
Telesignal Resolution
- Telesignal resolution: ≤ 2ms
Time synchronization method
- IRIG-B time synchronization
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 | Remarks |
|---|---|---|---|---|
| 1 | Differential Instantaneous Trip Setting | — | — | — |
| 1.1 | Differential Instantaneous Trip Protection | 1 / 0 | — | Differential instantaneous trip protection function: Enable (1) / Disable (0) |
| 1.2 | Instantaneous Trip Setting Value | 0.4～99.99 A | 0.01 A | — |
| 2 | Differential Protection Setting | — | — | — |
| 2.1 | Differential Protection Enable/Disable | 1 / 0 | — | Differential protection function: Enable (1) / Disable (0) |
| 2.2 | CT Broken Line Blocking Differential | 1 / 0 | — | Blocking function: Enable (1) / Disable (0) |
| 2.3 | Differential Setting Value | 0.5～99.99 A | 0.01 A | — |
| 2.4 | Restraint Setting Value | 0.5～99.99 A | 0.01 A | — |
| 2.5 | Differential Current Setting Value | 0.5～99.99 A | 0.01 A | — |
| 2.6 | CT Broken Line Threshold | 0.5～99.99 A | 0.01 A | — |
| 2.7 | Ratio Coefficient | 0.30～0.70 | 0.01 | — |
| 2.8 | Harmonic Coefficient | 0.10～0.70 | 0.01 | — |
| 3 | General Settings | — | — | — |
| 3.1 | Control Circuit Broken Line | 1 / 0 | — | Control circuit broken line alarm: Enable (1) / Disable (0) |
| 3.2 | Display Current Angle | 1 / 0 | — | — |
| 3.3 | Current Corresponds to 1A | 1 / 0 | — | Set 1: Input current 1A / Set 0: Input current 5A |
| 3.4 | Rated Current | 0.5～99.99 A | — | Secondary rated current of generator |
Outline and Installation Dimensions
FAQ
Q:What technical parameters should be considered when selecting a differential protection device for a generator?
A:When selecting generator protection devices such as differential relay for generator protection, differential relay protection of generator and digital relay protection of generator transformer, the key factors to consider are: voltage rating including low voltage (400 V), 10 kV, 66 kV and other generator output voltage levels; whether communication parameters comply with industry communication standards; whether the device’s functions and protection logic conform to relevant technical specifications; and whether the product meets IEC or IEEE standards.
Q:What is the differential protection range for a generator?
A:The scope of generator differential protection covers the interior of the generator; when an internal fault occurs, a current difference forms between the generator’s incoming and outgoing currents, and generator protection relay trips once this difference exceeds the preset threshold.
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