ASD-441H Relay Motor Protection

Description

Overview of Relay Motor Protection

• The  ASD-441H 3-phase Relay Motor Protection is primarily designed to protect motors.It is suitable for high-voltage motors in 3 kV to 35 kV systems,
  and serves as bay-level equipment, performing protection, measurement, control, and communication functions.

Product Functions (ANSI)

• Instantaneous Overcurrent Protection 50
• Definite Time Overcurrent & Negative Sequence Overcurrent Protection 51 / 46
• Inverse Time Overcurrent & Inverse Time Negative Sequence Current Protection 51 / 46
• Negative Phase Sequence Voltage Protection 47
• Locked Rotor Protection: Start Locked Rotor & Running Locked Rotor Protection 48
• Thermal Overload Protection 49
• Undervoltage Protection 27
• Overload Protection 51 / 49
• Zero-sequence Overcurrent Protection 50N / 51N
• Overvoltage Protection 59
• Long Start Time Protection / Start Supervision 66
• VT & CT Disconnection Supervision 60
• Control Circuit Break Monitoring 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	Running Stall Time (Running Stall Delay)	0.00～120.00s	×100
5	Starting Stall Time (Starting Stall Delay)	0.00～120.00s	×100
6	Instantaneous Overcurrent Delay	0.00～120.00s	×100
7	Negative Sequence Instantaneous Delay	0.00～120.00s	×100
8	Phase Sequence Reversal Voltage Delay	1.00～100.00s	×100
9	Under-voltage Protection Delay	0.00～120.00s	×100
10	Zero-sequence Overcurrent Delay	0.00～120.00s	×100
11	Overload Delay	0.00～120.00s	×100
12	Start Delay	0.00～120.00s	×100
13	Over-voltage Delay	0.00～120.00s	×100
14	Running Stall Current Setting	0.04～99.99A / 0.10～20.00A	×100
15	Starting Stall Current Setting	0.04～99.99A / 0.10～20.00A	×100
16	Instantaneous Overcurrent Setting (During Start-up)	0.04～99.99A / 0.10～20.00A	×100
17	Inverse-time Overcurrent Setting	0.50～10.00A / 0.20～2.00A	×100
18	Negative Sequence Instantaneous Current Setting	0.04～99.99A / 0.10～20.00A	×100
19	Negative Sequence Inverse-time Current Setting	0.50～10.00A / 0.20～2.00A	×100
20	Spare Setting (Original Start Setting)	–	×1
21	Zero-sequence Overcurrent Setting	0.02～5.00A / 0.50～99.00A	×100
22	Current Presence Setting	0.20～5.00A	×100
23	Overload Current Setting	0.04～99.99A / 0.10～20.00A	×100
24	Rated Current (Long-term Allowable Current of Motor)	1.00～5.00A	×100
25	τ1 (Time Constant for Inverse-time Overcurrent)	1.00～100.00s	×100
26	τ2 (Time Constant for Negative Sequence Inverse-time)	1.00～100.00s	×100
27	Thermal Protection (Thermal Time Constant)	1.00～100.00s	×100
28	Thermal Alarm Coefficient	0.01～0.08	×100
29	Under-voltage Protection Setting	5.00～100.00V	×100
30	Over-voltage Setting	5.00～100.00V	×100
31	Running Instantaneous Current Setting	0.04～99.99A / 0.10～20.00A	×100
32	Overcurrent Setting	0.04～99.99A / 0.10～20.00A	×100
33	Overcurrent Delay	1.00～100.00s	×100
34	Current Blocking Setting (Blocking Value for Over/Under-voltage Protection)	0.04～99.99A / 0.10～20.00A	×100
35	External Auto-start Delay	0.100～655.350s	×100
36~48	Reserved	–	–

Outline and Installation Dimensions

   

FAQ

Q：Relay Motor Protection is primarily designed to protect motors, so how should one choose one?

A:There are many types of motor protection relays, and several principles should be considered when selecting one.

First, motors are classified by voltage rating into low-voltage and high-voltage categories; different voltage ratings require different selection methods.

Second, consider the motor’s capacity; generally, motors with higher capacity have more stringent technical requirements.

Third, refer to the project’s technical specifications.

Q: What is Relay Motor Protection?

A: It refers to protective relays specially designed to monitor motors and guard against overload, short circuit and other faults.

Q: What core functions does Relay Motor Protection provide?

A: It mainly offers overcurrent, earth fault and overload protection to keep motors running safely.

Q: Where is Relay Motor Protection commonly used?

A: It is widely applied in industrial plants, power stations and distribution systems to protect various electric motors.