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441H Generator Backup Protection Relay
The generator backup protection relay is designed for the protection of thermal and hydroelectric generating units with a capacity of 10 MW or less, and works in conjunction with the AGP-441H differential protection device to provide protection. Its primary scope of protection covers the generator outlet and areas beyond it. It is typically installed in a panel or mounted directly on a switchgear cabinet.
Product Functions (ANSI)：27/59/46/32/40/51V/49/87UD/81U/81O/64
Communication Mode:Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103)
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Description
Product Overview
- Generator backup protection relay is designed for the protection of thermal and hydroelectric units with a capacity of 10 MW or less, and works in conjunction with the AGP-441H differential protection device to provide protection.
- The generator backup protection device is generally installed in a centralized panel layout for unified monitoring, protection and logical configuration.
- The overall protection functions, technical performance and external interface specifications fully comply with international IEC and IEEE standards, ensuring standardized, reliable and consistent protection operation for generator sets under normal and fault conditions.
Product Functions (ANSI)
- generator composite voltage overcurrent protection｜50V
- Generator transverse differential｜87GT
- generator reverse power protection ｜32
- Loss of Field Protection ｜40
- Undervoltage Protection｜27
- Underfrequency Protection｜81U
- Overfrequency Protection｜81O
- stator earth fault protection｜64
- Thermal overload protection｜49
- Overvoltage Protection｜59
- Negative Sequence Overcurrent Protection｜46
- VT Circuit Break / VT Failure｜60
- Control Circuit Disconnection｜74
Communication Mode
- Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103)
Setting Table
| No. | Description | Setting Range | Conversion Factor for Upload & Download |
|---|---|---|---|
| 1 | Control Word 1 | 0000～FFFF | – |
| 2 | Control Word 2 | 0000～FFFF | – |
| 3 | Control Word 3 | 0000～FFFF | – |
| 4 | Overcurrent Stage 1 Delay | 0.00～120.00s | ×100 |
| 5 | Overcurrent Stage 2 Delay | 0.00～120.00s | ×100 |
| 6 | Overcurrent Stage 3 Delay | 0.00～120.00s | ×100 |
| 7 | Negative Sequence Stage 1 Delay | 0.00～120.00s | ×100 |
| 8 | Negative Sequence Stage 2 Delay | 0.00～120.00s | ×100 |
| 9 | Transverse Differential Protection Delay | 0.00～120.00s | ×100 |
| 10 | Stator Earth Fault Delay | 0.00～120.00s | ×100 |
| 11 | Overload Delay | 0.00～120.00s | ×100 |
| 12 | Under-voltage Delay | 0.00～120.00s | ×100 |
| 13 | Over-voltage Delay | 0.00～120.00s | ×100 |
| 14 | Under-frequency Delay | 0.00～120.00s | ×100 |
| 15 | Over-frequency Delay | 0.00～120.00s | ×100 |
| 16 | Reverse Power Delay | 0.00～120.00s | ×100 |
| 17 | Loss of Excitation Time Limit 1 | 0.00～120.00s | ×100 |
| 18 | Loss of Excitation Time Limit 2 | 0.00～120.00s | ×100 |
| 19 | Overcurrent Stage 1 Setting (Instantaneous Overcurrent Setting) | 1.00～99.99A | ×100 |
| 20 | Overcurrent Stage 2 Setting (Time-limit Instantaneous Overcurrent Setting) | 1.00～99.99A | ×100 |
| 21 | Overcurrent Stage 3 Setting (Overcurrent Protection Current Setting) | 1.00～99.99A | ×100 |
| 22 | Overload Setting (Overload Current Setting) | 1.00～99.99A | ×100 |
| 23 | Spare Setting (Original Start Setting) | 1.00～99.99A | ×100 |
| 24 | Transverse Differential Setting | 0.02～5.00A | ×100 |
| 25 | Negative Sequence Stage 1 Setting | 1.00～99.99A | ×100 |
| 26 | Negative Sequence Stage 2 Setting | 1.00～99.99A | ×100 |
| 27 | Under-voltage Blocking Setting (Low voltage setting for blocking overcurrent/frequency protection) | 5.00～100.00V | ×100 |
| 28 | Negative Sequence Voltage Setting (Negative sequence voltage setting for blocking overcurrent) | 5.00～100.00V | ×100 |
| 29 | Stator Earth Fault Setting | 5.00～100.00V | ×100 |
| 30 | Over-voltage Setting (Over-voltage Trip Setting) | 0.00～100.00V | ×100 |
| 31 | Under-voltage Setting (Under-voltage Trip Setting) | 0.00～100.00V | ×100 |
| 32 | Reverse Power Setting | 0.05～0.20 Pn | ×100 |
| 33 | Active Power Blocking Setting for Loss of Excitation | 0.05～0.20 Pn | ×100 |
| 34 | Reactive Power Setting for Loss of Excitation | 0.05～0.20 Pn | ×100 |
| 35 | Under-frequency Protection Setting | 0.20～10.00Hz | ×100 |
| 36 | Over-frequency Protection Setting | 0.20～10.00Hz | ×100 |
| 37~48 | Reserved | – | – |
Outline and Installation Dimensions
FAQ
Q：What technical parameters should be considered when selecting a backup protection device for a generator?
A:When selecting a backup protection device for a generator, the following factors should be considered:
1. Whether the product meets acceptance standards; 2. The product’s features, including communication methods and protection functions; 3. The product’s installation method and scope of application, which should be determined based on the specific circumstances of the project.
Q：What are the common protection functions of generator backup protection devices?
A:Generator relay protection covers common functions of generator backup systems including overcurrent, loss-of-field, undervoltage, underfrequency and stator ground fault protection; these are standard features among main types of generator protection relays, while other protection functions are configured on a case-by-case basis.
Q: Main protection functions & ANSI codes?
A: 51 overcurrent, 46 negative sequence, 32R reverse power, 24 overexcitation, 21G impedance backup.
Q: What is Generator Backup Protection Relay?
A: It serves as the backup protection for generator main differential protection. It provides delayed fault tripping if main protection fails to operate, and also covers external faults on generator outlet circuits and adjacent busbars.
Q: What typical protection functions does it integrate?
A: It includes time-delay overcurrent protection, negative sequence overcurrent protection, zero-sequence earth fault backup protection, voltage-restricted overcurrent, overload alarm and out-of-step blocking logic.
Q: What kinds of faults can this backup protection respond to?
A: It handles external short circuits at generator terminals, busbar faults, single-phase earth faults, long-term phase unbalance, severe overload, and internal generator faults when the primary differential protection malfunctions or refuses to trip.
Q: What is the core difference between main differential protection and backup protection?
A: Generator differential is instantaneous main protection for internal winding faults. Backup protection adopts graded time delays to cooperate with upstream switchgear protection, acting as backup for both the generator and connected grid equipment.
Q: What analog signals need to be wired into the relay?
A: Three-phase current and three-phase voltage from the generator outlet CT and PT, plus auxiliary contacts of the generator circuit breaker for status interlock and blocking conditions.
Q: Can protection settings and multi-stage time delays be adjusted on site?
A: Yes. All action thresholds, voltage locking criteria and step delay values can be edited locally with password verification or remotely configured via the background monitoring platform.
Q: How does the relay prevent unwanted tripping during normal starting and load fluctuation?
A: It supports startup locking, breaker position interlock and soft threshold filtering, which shields transient unbalanced current during generator commissioning to avoid misoperation.
Q: Does the relay store fault records and wave recording data?
A: It automatically records fault time, triggered protection elements, electrical quantities before and after faults and fault waveforms. Historical records can be queried locally or uploaded to SCADA system.
Q: What communication protocols are supported for upper system connection?
A: Standard protocols are Modbus-RTU, Modbus-TCP and IEC 60870-5-104. IEC 61850 MMS and GOOSE are optional for intelligent power station networking.
Q: What working power supply does the device require?
A: Control power and tripping loop adopt DC 110V or DC 220V, which conforms to the unified power standard of generator protection panels in thermal and hydropower plants.
Q: What technical documents and after-sales guarantee are included?
A: Principle diagrams, terminal wiring drawings, setting guides and factory test reports are delivered together. The standard warranty period is 24 months from the date of factory shipment.
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Stable performance, reliable design, ensuring safe operation for power system protection and grid stability.
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Best Warranty
Professional Warranty: Reliable after-sales support for stable relay protection and long-term customer satisfaction.
xiao zhang –
This generator backup protection relay(21G/46/51/32R/24) integrates overcurrent, negative-sequence, reverse power and overexcitation protections. Adopts voltage restraint logic to avoid maloperation, supports fault recording and multi-protocol communication, ideal for various synchronous generator units.
Jack –
Built-in self-diagnostic features make maintenance much easier.