441H generator backup protection relay

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.