ASB-4401H Intelligent Transformer Protection Relays

Description

Overview

• The ASB-4401H Digital Plant Service Transformer Protection, Measurement, and Control Unit belongs to transformer protection relays, suitable for high-voltage and low-voltage plant service transformers, and integrates protection, measurement, control, and communication functions.

Protection Functions (with ANSI Codes)

• Combined undervoltage and negative-sequence voltage startup overcurrent protection ANSI 51V
•  Zero-sequence voltage blocking high-voltage side zero-sequence overcurrent protection ANSI 50N/51N+59N
• Low-voltage side zero-sequence overcurrent protection ANSI 50N/51N
• Zero-sequence overvoltage protection ANSI 59N
•  Overload alarm ANSI 49
• Undervoltage protection ANSI 27
•  Overvoltage protection ANSI 59
• Transformer body protection functions: heavy gas trip, overtemperature trip, light gas alarm, overtemperature alarm ANSI 63, 49T
• PT wire break detection and busbar insulation monitoring ANSI 60
•  Control circuit break supervision No dedicated ANSI code

Communication Functions

• The device supports three communication modes: RS-485, CANbus, and Ethernet (to be specified at the time of ordering);
• The device uploads real-time data, including measurement data, waveform data, faults, alarm signals, and all protection settings, configurations, and coefficients; it supports remote online modification of settings and activation/deactivation of protection functions;

Event Logging and Fault Recording

• Event logging includes protection trip events and device self-test faults;
• For protection trip events, the type, time of trip, and operating parameters at the time of trip are recorded; for device self-test faults, the type and time of occurrence are recorded;
• Fault recording includes: the time and type of the protection trip, as well as the rms values before and after the recording was initiated;
• Fault recording data length: 2 cycles before the fault and 4 cycles after the fault for each channel, totaling 192 data points per channel;
• SOEs can retain 48 sets of data in non-volatile memory, and fault reports can retain 16 sets of data in non-volatile memory

Monitoring Functions

• The device is capable of measuring analog quantities such as current, voltage, and frequency;
• It acquires position signals (e.g., circuit breaker, energy storage, isolating switch, remote/local) and other digital signals;
• It provides control functions for closing and opening circuit breakers.

Setting Table

No.	Display Name	Range	Step	Remark
1	**Stage 1 Protection Setting
1.1	Stage 1 Protection Enable/Disable	1/0	—	Stage 1 protection: Enable(1)/Disable(0)
1.2	Stage 1 Compound Voltage Blocking	1/0	—	Stage 1 compound voltage blocking: Enable(1)/Disable(0)
1.3	Stage 1 Directional Blocking	1/0	—	Stage 1 directional blocking: Enable(1)/Disable(0)
1.4	Stage 1 Time Delay	0.00～120.00s	0.01s	—
1.5	Stage 1 Setting Value	0.10～99.99A 0.10～20.00A	0.01A	In=5A In=1A
2	Stage 2 Protection Setting
2.1	Stage 2 Protection Enable/Disable	1/0	—	Stage 2 protection: Enable(1)/Disable(0)
2.2	Stage 2 Compound Voltage Blocking	1/0	—	Stage 2 compound voltage blocking: Enable(1)/Disable(0)
2.3	Stage 2 Directional Blocking	1/0	—	Stage 2 directional blocking: Enable(1)/Disable(0)
2.4	Stage 2 Time Delay	0.00～120.00s	0.01s	—
2.5	Stage 2 Setting Value	0.10～254.6A 0.10～20.00A	0.01A	In=5A In=1A
3	Stage 3 Protection Setting
3.1	Stage 3 Protection Enable/Disable	1/0	—	Stage 3 protection: Enable(1)/Disable(0)
3.2	Stage 3 Compound Voltage Blocking	1/0	—	Stage 3 compound voltage blocking: Enable(1)/Disable(0)
3.3	Stage 3 Directional Blocking	1/0	—	Stage 3 directional blocking: Enable(1)/Disable(0)
3.4	Stage 3 Time Delay	0.00～120.00s	0.01s	—
3.5	Stage 3 Setting Value	0.10～99.99A 0.10～20.00A	0.01A	In=5A In=1A
4	HV Side Zero-sequence Overcurrent
4.1	HV Zero-sequence Current Stage 1 Trip	1/0	—	HV side zero-sequence overcurrent Stage 1: Trip(1)/Alarm(0)
4.2	HV Zero-sequence Current Stage 2 Alarm	1/0	—	HV side zero-sequence overcurrent Stage 2 alarm: Enable(1)/Disable(0)
4.3	Zero-sequence Voltage Blocking for HV Zero-sequence Current	1/0	—	Zero-sequence voltage blocking for HV side zero-sequence current: Enable(1)/Disable(0)
4.4	HV Zero-sequence Current T1	0.00～120.00s	0.01s	Time delay of HV side zero-sequence overcurrent Stage 1
4.5	HV Zero-sequence Current T2	0.00～120.00s	0.01s	Time delay of HV side zero-sequence overcurrent Stage 2
4.6	HV Zero-sequence Current I1	0.10～5.00A	0.01A	Setting value of HV side zero-sequence overcurrent Stage 1
4.7	HV Zero-sequence Current I2	0.10～5.00A	0.01A	Setting value of HV side zero-sequence overcurrent Stage 2
4.8	Zero-sequence Voltage Blocking Value	1.00～120.00V	0.01V	Zero-sequence voltage for blocking HV zero-sequence current
5	LV Side Zero-sequence Overcurrent
5.1	LV Zero-sequence Current Stage 1 Trip	1/0	—	LV side zero-sequence overcurrent Stage 1: Trip(1)/Alarm(0)
5.2	LV Zero-sequence Current Stage 2 Alarm	1/0	—	LV side zero-sequence overcurrent Stage 2 alarm: Enable(1)/Disable(0)
5.3	LV Zero-sequence Current T1	0.00～120.00s	0.01s	Time delay of LV side zero-sequence overcurrent Stage 1
5.4	LV Zero-sequence Current T2	0.00～120.00s	0.01s	Time delay of LV side zero-sequence overcurrent Stage 2
5.5	LV Zero-sequence Current I1	0.10～5.00A 0.40～99.99A	0.01A	Setting for high-voltage factory transformer Setting for low-voltage factory transformer
5.6	LV Zero-sequence Current I2	0.10～5.00A 0.40～99.99A	0.01A	Setting for high-voltage factory transformer Setting for low-voltage factory transformer
6	Zero-sequence Overvoltage Setting
6.1	Zero-sequence Overvoltage Protection	1/0	—	Zero-sequence overvoltage protection: Enable(1)/Disable(0)
6.2	Zero-sequence Overvoltage Trip	1/0	—	Zero-sequence overvoltage: Trip(1)/Alarm(0)
6.3	HV Zero-sequence Current Blocking Zero-sequence Voltage	1/0	—	Block zero-sequence overvoltage by HV zero-sequence current: Enable(1)/Disable(0)
6.4	Zero-sequence Voltage Time Delay	0.00～120.00s	0.01s	Time delay of zero-sequence overvoltage
6.5	Zero-sequence Voltage Setting Value	0.10～120.00V	0.01V	Setting value of zero-sequence overvoltage
6.6	Zero-sequence Current Blocking Value	0.10～99.99A	0.01A	HV zero-sequence current setting for blocking zero-sequence overvoltage
7	Undervoltage Protection Setting
7.1	Undervoltage Protection Enable/Disable	1/0	—	Undervoltage protection: Enable(1)/Disable(0)
7.2	Undervoltage Protection Trip	1/0	—	Undervoltage protection: Trip(1)/Alarm(0)
7.3	Undervoltage Time Delay	0.00～120.00s	0.01s	—
7.4	Undervoltage Setting Value	0.10～100.00V	0.01V	—
8	Overvoltage Protection Setting
8.1	Overvoltage Protection Enable/Disable	1/0	—	Overvoltage protection: Enable(1)/Disable(0)
8.2	Overvoltage Protection Trip	1/0	—	Overvoltage protection: Trip(1)/Alarm(0)
8.3	Overvoltage Time Delay	0.00～120.00s	0.01s	—
8.4	Overvoltage Setting Value	0.10～100.00V	0.01V	—
9	Overload Protection Setting
9.1	Overload Protection Enable/Disable	1/0	—	Overload protection: Enable(1)/Disable(0)
9.2	Overload Time Delay T	0.00～120.00s	0.01s	Overload time delay
9.3	Overload Current I	0.10～99.99A 0.10～20.00A	0.01A	In=5A In=1A
10	General Setting
10.1	PT Broken Line Detection	1/0	—	PT broken line alarm: Enable(1)/Disable(0)
10.2	Blocking Exit upon PT Broken Line	1/0	—	1: Exit blocking judgement of compound voltage, undervoltage and direction 0: Only exit directional blocking judgement
10.3	Control Circuit Broken Line	1/0	—	Control circuit broken line alarm: Enable(1)/Disable(0)
10.4	Insulation Monitoring Enable/Disable	1/0	—	Insulation monitoring function: Enable(1)/Disable(0)
10.5	Current Rated 1A	1/0	—	Rated current 1A: Enable(1)/Disable(0)
10.6	B17 as Maintenance Plate	1/0	—	1: Maintenance plate 0: Common remote signal
10.7	Integral Energy Calculation	1/0	—	Calculate integral energy(1)/Not calculate(0)
10.8	Harmonic Component Calculation	1/0	—	Calculate harmonic component(1)/Not calculate(0)
10.9	Negative-sequence Voltage Setting	5.00～100.00V	0.01V	Negative-sequence voltage setting value
10.10	I-u Blocking Voltage	5.00～100.00V	0.01V	—
10.11	Sudden Change Startup Current	0.01～20.00A	0.01A	—

Outline and Installation Dimensions

   

FAQ

Q：how to size up a current transformer for relay protection,Especially for transformer protection relays?

A:When selecting current transformers for relays used in transformer protection and transformer protection relay applications, it is necessary to comprehensively consider rated parameters, accuracy class, anti-saturation capability, secondary winding configuration and mounting method for protection in transformer and protective transformer scenarios; the higher the voltage level, the more stringent the technical requirements, ensuring reliable operation of the protection system.

Q：How does this device differ from transformer differential protection and transformer backup protection?

A:Transformer differential protection and backup protection are part of the main protection system for transformers, designed for medium- and large-sized transformers, whereas this device is primarily intended for smaller service transformers or other small transformers.