How to choose the suitable protection relay?

It depends what protection functions you need and where you will ues.

How to set the CT and PT ratio of the protection relay?

Protection relay device can set the CT and PT ration through the fixed value menu.

Acrel Medium Voltage Protection Relays, Power System And Protection, Electricity Monitor

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Acrel AM series medium voltage protection relays integrates protection, measurement and control. It is suitable for user terminal substations (stations) with voltage levels of 35kV and below, and can realize the protection and measurement and control of user substations. Applicable to electric power, water conservancy, transportation, petroleum, chemical, coal, metallurgy and other industries.

Products

AM Series Medium Voltage Protection Relays For Sale

Complete protection function,multi input resources, RS232/RS485 interface,Reliable and stable performance

AM Series Medium Voltage Protection Relays Data Sheet

Protection functions
Type	AM3SE-I	AM3SE-U
Overcurrent (3 stages,IDMT)	√
Earth fault (3 stages,IDMT)(I01/I02)	√
Negative sequence overcurrent (2 stages,IDMT)	√
Auto-reclose	√
Overload (trip/alarm)	√
Under frequency	√
Post-accelerated overcurrent	√
Post-accelerated overcurrent(I01/I02)	√
Overvoltage(trip)	√
Undervoltage (trip)	√
Self-produced over zero-voltage (trip)	√
Residual overvoltage (trip)	√
FC block	√
Trip and close circuit supervision (alarm)	√
Non-electricity (trip/alarm)	√
Undervoltage (alarm)	√	√
Overvoltage (alarm)	√	√
Residual overvoltage (alarm)	√	√
PT supervision (alarm)	√	√
Self-produced over zero-voltage (alarm)		√
Rear ports	I	U
RS485	√
Protocols	I	U
Modbus serial	√
IEC 60870-5-103	√
Measurement	I	U
Electric parameter	U,I,P,Q,PF,Fr,Ep,Eq,Es
Input Current	5	0
Input Voltage	3	3
Logs and Records	I	U
Fault recorder	√
Sequence of event record	√
Monitoring Functions	I	U
Anti-pumping circuit	Optional
Remote control	√

How Do Protection Relays Work?

It integrates various functions such as protection, measurement, control, monitoring, communication, event recording, fault recording, and operation error prevention. It can cooperate with the operating system to complete the functions of substation control, protection, and anti-misoperation locking, and can also independently complete the complete set of protection and measurement monitoring functions for small and medium-scale unattended substations of 35kv and below or medium and low voltage sides. It can be installed in a decentralized way, or can be assembled in a centralized manner.

AM Series Medium Voltage Protection Relays FAQs

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What is a medium voltage protection relay?
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It integrates various functions such as protection, measurement, control, monitoring, communication, event recording, fault recording, and operation error prevention.
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How to choose the suitable protection relay?
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It depends what protection functions you need and where you will ues.
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How to set the CT and PT ratio of the protection relay?
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Protection relay device can set the CT and PT ration through the fixed value menu.
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What's the application of protection relay?
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Electric power, water conservancy, transportation, petroleum, chemical, coal, metallurgy and other industries.