Overcurrent Protection Relays for Electrical Power System

Product Description

Overcurrent Protection Relays for Electrical Power System
AM5 series microcomputer protection devices are applicable to the user substation in which the input voltage is 35kv or above. AM5 can be used to protect and control the user substation and is being widely used in Power Industry, Water conservancy industry, Traffic Industry, Oil industry, Chemical industry, Coal Industry, Metallurgical Industry, and so on.

Product Parameters

Function		Specification
		-F	-C	-M	-T	-B	-U1	-DB
Hardware Resource	Current acquisition	8	8	8	8	6	0	6
	Voltage acquisition	4	4	4	4	6	4	6
	Switch Collection	16	16	16	16	16	16	16
	Relay Output	10	10	10	10	10	10	10
Protection	Three-stage overcurrent protection	√			√
	Three-stage overcurrent with direction blocking	√
	Two-stage overcurrent protection		√	√		√		√
	Zero-sequence overcurrent protection	√	√	√	√
	Inverse time overcurrent protection	√	√	√	√	√
	Overload protection	√		√	√
	Control circuit disconnection alarm	√	√	√	√	√		√
	Under-voltage protection			√			√alarm
	Lack of voltage protection	√
	PT disconnection alarm	√	√	√	√	√	√	√
	Three-phase one-time reclosing	√
	Low-frequency load shedding	√
	High-frequency protection	√
	After accelerating overcurrent	√				√		√
	Overvoltage protection	√	√	√			√alarm	√alarm
	Locked-rotor protection
	Undervoltage protection		√
	Unbalanced voltage protection		√	√
	Unbalanced current protection		√	√
	Phase error protection			√
	Zero sequence overvoltage protection	√	√	√			√alarm
	Non-electric protection	√	√	√	√
	Starting over time			√
	Reverse power protection	√
	Thermal overload protection			√
	Negative sequence overcurrent (two stages / inverse time limit)			√
	Incoming line / busbar					√		√
	Busbar charging protection					√
	FC blocking	√	√	√	√
	Second harmonic blocking	√	√	√	√
	Intermittent ground protection	√	√
	Overhaul status lockout	√	√	√	√	√	√	√
Communication protocol	ModBus-RTU	√	√	√	√	√	√	√
	IEC60870-5-103	√	√	√	√	√	√	√
Accessibility	Fault recorder	√	√	√	√	√		√
	IRIG-B time synchronization	√	√	√	√	√	√	√

 

 

Dimension

 

Display

Wiring

 

Networking

FAQ

Q: How to set the CT and PT ratio of the protection device?

A: The protection device can set the CT and PT ratio through the fixed value menu. For example, if the current transformer is 75/5 and the voltage transformer is 10/0.1, then the CT ratio is set to 15 and the PT ratio is set to 100.


Q: For AM5, if you want to place single circuit protection and transformer protection, how to distinguish the model?

A: AM5-F is suitable for line protection and transformer protection.No need to distinguish between models when placing orders


Q: When the voltage is a three-phase three-wire system, does the current have to be connected with 2CT?

A: The voltage wiring mode and current wiring mode of the protection device can be set independently, and can be connected freely.


Q: How to confirm whether the anti-trip function is configured?

A: If the circuit breaker is equipped with anti-trip, the device does not must be equipped with anti-trip; if the circuit
breaker does not have anti-trip, you need to configure the AM5-FT anti-trip module. (If DC48V is selected as the
operating power supply, the anti-trip box is not optional, and the circuit breaker must be equipped with anti-trip
function; if you choose AC anti-trip, please note that AC and DC general anti-tripping)


Q: How to purchase suitable protection devices?

A: Before ordering, it is recommended to consult related engineers, select the appropriate protection model,
and then fill in the corresponding selection table, and place the order after confirmation by the engineers.

Related Products

Specification		AM2SE	AM3SE	AM4	AM5	AM5SE
Hardware	Protect Current	3 channels	3 channels	3 channels	3 channels	3 channels
	Measure Current	×	×	×	3 channels	3 channels
	zero-sequence current	1 channel	2 channels	1 channel	2 channels	2 channels
	Measure Voltage	3 channels	3 channels	4 channels	4 channels	4 channels+ backup 2 channels
	Switch Value Input	8 channels	11 channels	12 channels	16 channels	20 channels
	Switch Value Output	5 channels	5 channels	5 channels	10 channels	10 channels
	RS485 Interface	1 channel	1 channel	1 channel	2 channels	2 channels
	RS232 Interface	×	×	1	1	1
	USB	×				√
	CE	×				optional 2
	GPS time synchronization	×	√	×	√	√
	4-20mA	×				optional 2
	Anti-jump	Optional external anti-hop module				built-in
	operation circuit	×				√
Protection	Main transformer differential protection	×	×	×	×	√
	Main transformer backup protection	×	×	×	×	√
	Three-stage overcurrent With direction with a voltage blocking	×	×	×	√	√
	Three-stage overcurrent with directional locking	×	√	√	√	√
	Three-stage overcurrent	√	√	√	√	√
	Zero sequence overcurrent protection	√	√	√	√	√
	Overvoltage protection	√	√	√	√	√
	Low voltage protection	√	√	√	√	√
	Zero sequence overvoltage protection	√	√	√	√	√
	High-power motor differential protection (>2000KW)	×	×	×	×	√
	High Voltage Motor Protection	×	×	×	√	√
	Capacitor Protection	×	×	×	√	√
	Overcurrent after acceleration	√	√	√	√	√
	Low-frequency load shedding	√	√	√	√	√
	Grid-connected reverse power protection	×	×	×	√	√
	PT disconnection alarm	√	√	√	√	√
	Fault alarm	√	√	√	√	√
	FC blocking	√	√	√	√	√
	Incoming line of high voltage single busbar system /Mother-joint prepared self-injection	×	×	×	√	√
	Low-voltage standby self-switching(400V)	×	×	×	√	×
	PT monitoring and parallel functions	×	×	×	×	√
	PT monitoring functions	√	√	√	√	√
	Non-electrical protection (temperature, gas, etc.)	√	√	√	√	√
	Synchronization function	×	×	×	×	√
	Fault recorder	√	√	√	√	√
Electrical parameter measurement		U, I, Fr, P, Q, PF, Ep, Eq, Es

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