Intelligent Low-Voltage Line Protection and Measurement Device

• Customization: Available
• After-sales Service: Two Years
• Warranty: Two Years
• Model NO.: LON531L
• Origin: Made in China
• HS Code: 90283012
• Production Capacity: 10000 Per Month

Product Description

Intelligent low-voltage line protection and measurement device

1.Product profile
The intelligent low-voltage protection and measurement device is a new generation of protection and measurement device developed by our company for various fault characteristics of low-voltage MCC circuit motors. It is suitable for AC380V and AC660V low-voltage systems and is mainly divided into LON531D low-voltage motor protection and measurement device and LON531L low-voltage line protection and measurement device. It is a low-voltage protection and measurement device with extremely high cost-effectiveness, stability and reliability, integrating relay protection, measurement, control, and communication. The protection measurement and control device collects data such as three-phase current, three-phase phase voltage, line voltage, grounding current, etc. These data are calculated and compared with various protection function setting information recorded by the device. When the protection action conditions are met, the relay output is driven to achieve reliable protection of the motor.
The intelligent low-voltage protection measurement and control device consists of two parts: the protection measurement and control device host and the MCT current transformer. It can achieve measurement function, protection function, motor start/stop control function, and remote communication function. Using RS485 communication function as an important means of remote management, supporting MODBUS-RTU communication protocol.

2.Product specifications

function point	function point descriptions	motor protection	line protection
protection functions	Initiate timeout protection	√	-
	overload protection, overcurrent blocking protection, short circuit protection	√	-
	Current imbalance protection	√	√
	Voltage unbalance protection	√	√
	phase failure protection	√	-
	ground fault synthesis computational protection	√	√
	Leakage protection / ground fault real pick protection (need to be equipped with zero sequence current transformer / grounding current transformer)	○	○
		(Either/or)	(Either/or)
	underload protection	√	-
	overflow fault (fault current exceeding the breaking capacity of the contactor) trips the circuit breaker	√	-
	Over-voltage protection, loss of voltage, under-voltage protection	√	√
	frequency protection, under power factor protection, phase sequence protection	√	-
	Anti-Shake/Shake Restart	○	○
	External interlocks	√	√
	tE time protection	√	-
	Electrical current interruption protection (low voltage blocking overcurrent section)	-	√
	Current-limited quick disconnect protection (low voltage blocking overcurrent II)	-	√
	Overcurrent protection (three stages of overcurrent)	-	√
	Overload protection	-	√
	Spring not storing energy alarm	-	√
	PT disconnection alarm	-	√
	Temperature protection (PTC/NTC)	○	-
	Control loop disconnection alarm	-	√
	Negative sequence protection	-	√
	under power protection	-	√
	phase sequence protection	-	√
	inverse time overcurrent	-	√
	Three-stage fixed-time overcurrent	-	√
	inverse time zero sequence overcurrent	-	√
	three-segment time-limited zero-sequence overcurrent	-	√
real-time measurements	three-phase current, grounding current, three-phase current unbalance ratio	√	√
	Leakage current/grounding actual pickup current	○	○
	three-phase phase voltage, three-phase line voltage, frequency	√	√
	power factor, active power, reactive power, active energy, reactive energy	√	√
	zero sequence voltage, positive sequence voltage, negative sequence voltage	-	√
	Power quality (including 2nd~63rd harmonics, voltage-current unbalance rate, harmonic distortion rate)	√	√
line fault alarms	loss of voltage, overvoltage, undervoltage, voltage imbalance, voltage reverse order, voltage transient rise/fall	√	√
	Loss of current, overcurrent, current breakage, current imbalance, current reverse order	√	√
	overload, phase failure, demand overrun	√	√
event logging	Line Fault Alarm, DI Transposition, Closing and Opening Records, up to 100 records	√	√
	Fault recording, up to 50 entries	√	√
	Motor running hours, stopping hours, number of normal circuit breaker trips, number of fault trips	√	√
switching inputs	With 8-channel DI, built-in power supply, external passive trunk node	√	√
Relay Output	With 5-way DO, AC 250/10A; DC 30V/10A	√	√
analog output	Optional 1-channel DC4~20mA analog variable output	√	√
digital communications	2 RS485 interfaces, support MODBUS-RTU protocol	√	√
undervoltage restart	With the voltage detection function module, it can realize the short-time under and voltage loss restart function	√	-
protection parameter settings	All kinds of protection fixed value query, adjusting	√	√
system parameterization	Parameterization of rated voltage, rated current, and communication address	√	√
LED indication	start, run, alarm/action, stop	√	√
Online upgrade	Support 485 communication mode upgrade	○	○
Note: "√" indicates that this function is standard, "○" indicates that this function is optional, and "-" indicates that this function is not available

3.Selection specifications  

performance parameters		performance indicators
accuracy class		U,I : ±1%,P,Q,PF :±2%,F :±0.1HZ,
		active energy: level 2, reactive energy: level 2
Wiring method		Three-phase, four-wire
Input Voltage	Rated voltage	380V 660VAC
	Frequency range	45~65Hz
	Measuring range	10% ~ 120%Ue
	Power consumption	< 0.3VA
Input current	Rated current	1A,2A,5A,6.3A,10A,25A,30A,50A,100A,200A,400A
	overload capacity	2Ie (continuous); 10Ie (10s allowed); 40Ie (1s allowed)
	Measuring range	10% ~ 200%Ie
	Power consumption	< 0.5VA
Leakage current	Measuring range	10% ~ 100%Is
	Measurement accuracy	±1%FS
Operating power supply	operating voltage range	AC /DC 85~264V
	Power consumption	<9W
analog output	Output range	4ma ~ 20ma
	maximum load capacity	500R
RTDs	Temperature range	0.1K ~30K
	Temperature measurement error	±2%FS
switching outputs	output form	mechanical contacts
	Maximum switching voltage	250V AC,30VDC
	Maximum switching current	10A
	voltage withstand between contact and coil	2500Vac rms
switching inputs	Input form	Active Wet Node Error ±20%
		(External 220VAC, 220VDC, 110VDC)
		Passive trunk node (internal 24VDC)
	isolation voltage	2000Vac rms
485 interface	interface form	Half-Duplex, Optically Isolated
	address range	1~247
	communication protocols	Modbus-RTU
	the communication baud rate	2400~19200bps, default 9600bps
environmental conditions	Operating Temperature	-20ºC~60ºC
	storage temperature	-25ºC~70ºC
	Operating humidity	0 to 85% non-condensing
	Atmospheric pressure	86kPa~106kPa
Measurement performance	electrical energy accuracy	GB/T 17215.321-2021 Class A
mechanical properties	Vibration	GB/T 11287 severity class 1
	Impact	GB/T 14537 Severe Grade 1
	Collision	GB/T 14537 Severe Grade 1
electromagnetic compatibility performance	Radio Frequency Electromagnetic Field Immunity Test	GB/T 17626.3-2016 severity level 3
	Electrical fast transient pulse group test	GB/T 17626.4-2018 severity level 3
	Attenuated oscillatory wave immunity test	GB/T 17626.12-2013 severity level 3
	Surge immunity	GB/T 17626.5-2019 severity level 3
	RF conducted immunity	GB/T 17626.6-2017 severity level 3
	Radio interference	GB/T 17215.211-2021 Class B equipment
	Work-frequency magnetic field interference degree	GB/T 17626.8-2006 severity level 3
electrical insulation properties	insulation resistance	GBT 13729-2019 , not less than 100MΩ
	medium strength	GB/T 13729-2019, Industrial frequency voltage 2.5kV, 1 min
	Impulse voltage	GB/T 13729-2019,1.2/50μs,5kV

4.Product installation and schematic diagram

5.Solution

6.About our service           
*  We could provide 7* 24-hour phone call after-sales service. 
*  We provide a 2-year guarantee time and will change the meter for you within 1 year if there's something wrong with the product. Except for natural disasters or man-made reasons.
*  Recommend the most advanced application technology and management model in the industry to customers, and provide customers with detailed solutions.

7.Package and ship