Intelligent low-voltage protection measurement and control 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 |
| 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 |
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
