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.

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)

Main Functional Specifications

• Protection response time (including the response time of the output relay): Average error in response time: not more than 35 ms;
• Precision operating range: Minimum precision current: 0.08 In, Maximum precision current: 20 In
• Current setting error: When the current exceeds 1.00 A, the error shall not exceed ±2.5%; Voltage setting error: shall not exceed ±3%
• Measurement accuracy: Current (I)/Voltage (U): Class 0.2; Power (P)/Reactive power (Q): Class 0.5
• Remote signal resolution: no more than 2 ms

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	Remark
1	Three-stage Overcurrent Protection: Stage I Setting
1.1	Stage I Protection Enable	1/0	—	Stage I protection: Enable(1) / Disable(0)
1.2	Stage I Composite Voltage Blocking	1/0	—	Composite voltage blocking: Enable(1) / Disable(0)
1.3	Stage I Directional Blocking	1/0	—	Directional blocking: Enable(1) / Disable(0)
1.4	Stage I Time Delay	0.00～120.00s	0.01s
1.5	Stage I Current Setting	0.40～99.99A	0.01A
2	Three-stage Overcurrent Protection: Stage II Setting
2.1	Stage II Protection Enable	1/0	—	Stage II protection: Enable(1) / Disable(0)
2.2	Stage II Composite Voltage Blocking	1/0	—	Composite voltage blocking: Enable(1) / Disable(0)
2.3	Stage II Directional Blocking	1/0	—	Directional blocking: Enable(1) / Disable(0)
2.4	Stage II Time Delay	0.00～120.00s	0.01s
2.5	Stage II Current Setting	0.40～99.99A	0.01A
3	Three-stage Overcurrent Protection: Stage III Setting
3.1	Stage III Protection Enable	1/0	—	Stage III protection: Enable(1) / Disable(0)
3.2	Stage III Composite Voltage Blocking	1/0	—	Composite voltage blocking: Enable(1) / Disable(0)
3.3	Stage III Directional Blocking	1/0	—	Directional blocking: Enable(1) / Disable(0)
3.4	Stage III Time Delay	0.00～120.00s	0.01s
3.5	Stage III Current Setting	0.40～99.99A	0.01A
4	Transverse Differential Overcurrent Setting
4.1	Transverse Differential Overcurrent Protection	1/0	—	Enable(1) / Disable(0)
4.2	Transverse Differential Trip Mode	1/0	—	Trip(1) / Alarm(0)
4.3	Transverse Differential Time Delay	0.00～120.00s	0.01s
4.4	Transverse Differential Setting	0.02～5.00A	0.01A
5	Stator Ground Fault Setting
5.1	Stator Ground Protection	1/0	—	Enable(1) / Disable(0)
5.2	Stator Ground Trip Mode	1/0	—	Trip(1) / Alarm(0)
5.3	Ground Fault Time Delay	0.00～120.00s	0.01s
5.4	Ground Voltage Setting	5.00～100.00V	0.01V
6	Undervoltage Protection Setting
6.1	Undervoltage Protection Enable	1/0	—	Enable(1) / Disable(0)
6.2	Undervoltage Time Delay	0.00～120.00s	0.01s
6.3	Undervoltage Threshold	0.10～100.00V	0.01V
7	Overvoltage Protection Setting
7.1	Overvoltage Protection Enable	1/0	—	Enable(1) / Disable(0)
7.2	Overvoltage Time Delay	0.00～120.00s	0.01s
7.3	Overvoltage Threshold	0.10～120.00V	0.01V
8	Underfrequency Protection Setting
8.1	Underfrequency Protection Enable	1/0	—	Enable(1) / Disable(0)
8.2	Underfrequency Trip Mode	1/0	—	Trip(1) / Alarm(0)
8.3	Undervoltage Blocking for Underfrequency	1/0	—	Enable(1) / Disable(0)
8.4	Protection Time Delay	0.10～120.00s	0.01s
8.5	Underfrequency Threshold	46.00～50.00Hz	0.01Hz
9	Overfrequency Protection Setting
9.1	Overfrequency Protection Enable	1/0	—	Enable(1) / Disable(0)
9.2	Overfrequency Trip Mode	1/0	—	Trip(1) / Alarm(0)
9.3	Undervoltage Blocking for Overfrequency	1/0	—	Enable(1) / Disable(0)
9.4	Protection Time Delay	0.00～120.00s	0.01s
9.5	Overfrequency Threshold	50.00～54.00Hz	0.01Hz
10	Thermal Overload Protection Setting
10.1	Overload Protection Enable	1/0	—	Enable(1) / Disable(0)
10.2	Overload Time Delay	0.00～120.00s	0.01s
10.3	Overload Current Setting	0.00～99.99A	0.01A
11	Reverse Power Protection Setting
11.1	Reverse Power Protection Enable	1/0	—	Enable(1) / Disable(0)
11.2	Reverse Power Time Delay	0.00～120.00s	0.01s
11.3	Reverse Power Threshold	0.05～0.20 Pn	0.01Pn
12	Loss of Field Protection Setting
12.1	1st Stage Field Loss Enable	1/0	—	Enable(1) / Disable(0)
12.2	2nd Stage Field Loss Enable	1/0	—	Enable(1) / Disable(0)
12.3	Active Power Blocking for Field Loss	1/0	—	Enable(1) / Disable(0)
12.4	1st Stage Time Delay	0.00～120.00s	0.01s
12.5	2nd Stage Time Delay	0.00～120.00s	0.01s
12.6	Active Power Blocking Threshold	0.05～0.20Pn	0.01Pn
12.7	Reactive Power Threshold for Field Loss	0.05～0.20Pn	0.01Pn
13	Negative Sequence Overcurrent Setting
13.1	1st Stage Negative Sequence Protection	1/0	—	Enable(1) / Disable(0)
13.2	2nd Stage Negative Sequence Protection	1/0	—	Enable(1) / Disable(0)
13.3	1st Stage Time Delay	0.00～120.00s	0.01s
13.4	2nd Stage Time Delay	0.00～120.00s	0.01s
13.5	1st Stage Negative Sequence Current	0.00～99.99A	0.01A
13.6	2nd Stage Negative Sequence Current	0.00～99.99A	0.01A
14	General Setting
14.1	VT Disconnection Detection	1/0	—	Enable(1) / Disable(0)
14.2	Blocking Release after VT Fault	1/0	—	Cancel composite & directional blocking(1) / Reserve blocking(0)
14.3	Control Circuit Break Detection	1/0	—	Enable(1) / Disable(0)
14.4	Secondary Current Rating	1/0	—	1A(1) / 5A(0)
14.5	Rated Input Voltage	1/0	—	380V(1) / 100V(0)
14.6	Maintenance Plate B17 Definition	1/0	—	380V mode(1) / 100V mode(0)
14.7	F-U Blocking Voltage	5.00～100.00V	0.01V	Undervoltage threshold for overcurrent blocking
14.8	I-U Blocking Voltage	5.00～100.00V	0.01V	Undervoltage threshold for overcurrent blocking
14.9	Negative Sequence Voltage Threshold	5.00～100.00V	0.01V	Negative sequence voltage blocking setting
14.10	Secondary Rated Current	0.50～6.00A	0.01A	CT secondary rated current

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.