Audited Supplier
LON823E-4
Two Years
Two Years
Digital
Direct Connected
Multi-Functional Energy Meter
Three-phase Four-wire
Electronic Meter
Feed-through Type
Energy Meter
ISO
Customized
Linkelec
Carton
Made in China
90283012
Product Description
Low voltage cable branch box monitoring unit
1.Product profile
The branch monitoring unit is mainly installed in the comprehensive distribution cabinet (JP cabinet) of the distribution transformer and the cable branch box, to monitor the operation status of low-voltage lines and indicate the fault status of the lines. The branch monitoring unit is connected to three-phase voltage and collects three-phase current through current transformers. The collected electrical signals and related fault information are uploaded through power line carrier communication. RS485 can also be used for data upload or device control, suitable for power monitoring and fault detection of 400V lines. It can collect information such as operating current, voltage, and protection current of low-voltage lines, calculate active and reactive power of the lines, detect line faults and issue fault alarms, and achieve information management of low-voltage power grids.
4.Product installation and schematic diagramThe branch monitoring unit is mainly installed in the comprehensive distribution cabinet (JP cabinet) of the distribution transformer and the cable branch box, to monitor the operation status of low-voltage lines and indicate the fault status of the lines. The branch monitoring unit is connected to three-phase voltage and collects three-phase current through current transformers. The collected electrical signals and related fault information are uploaded through power line carrier communication. RS485 can also be used for data upload or device control, suitable for power monitoring and fault detection of 400V lines. It can collect information such as operating current, voltage, and protection current of low-voltage lines, calculate active and reactive power of the lines, detect line faults and issue fault alarms, and achieve information management of low-voltage power grids.
2.Technical indicators
3.Selection specifications| performance parameter | Performance index | |
| accuracy class | Voltage: 0.2%; Current: 0.2%; Active power: ≤ 0.5%; Reactive power: 1%; Power factor: 0.5%; Apparent power: ≤ 1%; Electricity: 0.5%; Frequency: 0.02 Hz | |
| display mode | light emitting diode | |
| Connection mode | Three-phase four wire | |
| input voltage | rated voltage | AC220 |
| frequency range | 45~65HZ | |
| measuring range | 60V~1.2Un | |
| incoming current | rated current | Single-phase 0-10A/10mA and three-phase 0-50A/50mA. |
| Operating voltage range | AC/DC 85V~265V | |
| working power supply | Power consumption | <=5VA |
| Static power consumption of the whole machine | Not more than 3W,5VA | |
| Super capacitor | Power off for 1 minute. | |
| Switch input | Input form | Dry node (internal DC12V) |
| Switch output | output form | Mechanical contact |
| contact rating | AC250V/1A,DC30V/1A | |
| communication interface | Interface form | RS485, carrier module |
| protocol | Modbus,DLT645 | |
| environmental conditions | Ambient temperature and humidity | Reference temperature: 23ºC |
| Reference humidity: 40%~60% | ||
| Temperature range:-40 ~+70ºC | ||
| Maximum temperature change rate: 1.0ºC/min | ||
| Relative humidity: 10 ~ 100% | ||
| Maximum absolute humidity: 35g/m | ||
| operational environment | There is no explosion danger, corrosive gas and conductive dust, serious mold and violent vibration shock source. | |
| storage temperature | -35ºC~80ºC | |
| Clock accuracy | 0.5S/ day | |
| functional module | serial number | Function point | Function point description | Branch monitoring unit |
| Real-time measurement | 1 | phase voltage | Phase voltage: Ua, Ub, Uc | √ |
| 2 | line voltage | Line voltage: Uab, Ubc, Uca | √ | |
| 3 | Voltage sequence component | Voltage sequence components: U1, U2, U0 | √ | |
| 4 | phase current | Phase current: Ia, Ib, Ic | √ | |
| 5 | Current sequence component | Current sequence components: I1, I2, I0 | √ | |
| 6 | active power | Active power: Pa, Pb, Pc, p. | √ | |
| 7 | wattless power | Reactive power: Qa, Qb, Qc and Q. | √ | |
| 8 | apparent power | Apparent power: Sa, Sb, Sc, s | √ | |
| 9 | Power factor | Power factor: Pfa, Pfb, Pfc, Pf | √ | |
| 10 | phase position | Voltage/current: ∠Ua, ∠Ub, ∠Uc, ∠Ia, ∠Ib, ∠Ic | √ | |
| 11 | frequency | System frequency: f | √ | |
| Electricity measurement | 12 | Active power | Split-phase and combined-phase bidirectional active energy | √ |
| 13 | Reactive power | Split-phase and combined-phase bidirectional reactive power | √ | |
| 14 | Apparent electric degree | Split-phase and close-phase are in electric energy. | √ | |
| Power quality | 15 | Harmonic content | The harmonic content of three-phase voltage and current is 2~31 times. | √ |
| 16 | Harmonic distortion rate | Total, odd and even harmonic distortion rate | √ | |
| 17 | imbalance/ loss of balance | Unbalanced voltage and current | √ | |
| 18 | Crest coefficient | Peak coefficient of three-phase voltage | √ | |
| 19 | Telephone harmonic factor | Telephone harmonic factor THF | √ | |
| 20 | K coefficient | K coefficient of three-phase current | √ | |
| 21 | Frequency deviation | System frequency deviation | √ | |
| remote signalling | 22 | Drive in and out | It has the status of remote communication in and out. | √ |
| 23 | Over-limit alarm | Remote communication state with 8-level out-of-limit alarm | √ | |
| out-of-limit | 24 | Over-limit alarm | 8-level over-limit alarm function, which can monitor power parameters and remote signal volume and generate an alarm when conditions are met. | √ |
| incident record | 25 | SOE record | It has 64 SOE recording functions, including switch displacement, remote control, over-limit alarm, etc., and it is recorded with time scale. | √ |
| 26 | Maximum record | The maximum and minimum values of relevant parameters (voltage, current, active power, reactive power, apparent power, power factor, frequency and demand) can be counted in real time, and recorded with time scales. | √ | |
| clock | 27 | clock | Accurate clock with hardware | √ |
| in-out | 28 | Switch input | 3 passive node inputs | ○ |
| 29 | Switch output | 2-way relay output | ○ | |
| communication interface | 30 | RS485 communication | Standard 1 RS485 communication, supporting MODBUS-RTU protocol; DLT645 protocol, which supports online upgrade program through RS485 interface. | √ |
| 31 | Carrier communication | Support single-phase carrier module | √ | |
| Note: "√" marks this function as standard, and "○" indicates that this function is optional. | ||||
5.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.
6.Package and ship
