PD7777-H series digital harmonic multi-functional meter
Summary:
PD7777-H series digital harmonic multi-functional meter is mainly applied into highly accurate real-time measurement and indication such as voltage, current, active power, reactive power, apparent power, frequency, power factor, four-quadrant electric energy, voltage/current harmonic content (2nd ~31st), total harmonic content of voltage/current and degree of unbalancedness of voltage/current (including positive, negative, zero sequence) in the electrical circuit. The instrument supports switch quantity input, switch quantity output, analog quantity output, RS485 interface, USB interface and other functions.
1. Main functions and characteristics:
◆It adopts dot colorized LCD sketch display with intuitive and friendly interface.
◆It can measure the electrical parameters such as current, voltage, active/reactive power, apparent power, power factor, frequency, etc. in the electrical network.
◆Accurate measurement four-quadrant energy.
◆power quality monitoring:
Measure the 2nd~31st harmonic content of the voltage, current, total harmonic distortion, bar graph of the display harmonic in the electrical network.
Measure the power quality parameters such as positive sequence, negative sequence, zero sequence of voltage/current, degree of unbalancedness, etc.
Online real-time displayed voltage, current waveform, observing the real-time condition of power grid, which can realize the phase sequence regulation such as voltage and current and loss of phase detection, etc.
◆Input/output function of the modules:
Provide one-way active energy and one-way reactive power impulse output.
Provide multi-way relay switch output function, which can realize upper and lower limit alarm output.
Provide four-way switch input state indicating function, adopting passive stem node resistive signal input method.
◆With the standard RS-485 communication interface, adopting the standard ModBus-RTU communication protocol and the baud rate can be set.
◆Each switch quantity has 500 SOE event recording function.
◆It is characterized with 500 pieces of manual and automatic fault wave recording function, continuously saving loaded curve data records for one year.
◆Parameters such as the current/voltage ratio, indication mode for electrical quantity, the of the meter, electric quantity display mode, communication address of the meter, baud rate, transmitting output object, transmitting output range, alarming object, alarming upper/lower limit, etc. can be randomly programmed and set.
2. Model specification and selection description:
(unit: mm)
Model | Measurement display | Energy | Power pulse | RS485 communication | Analog quantity output | Switch quantity output | Switch quantity input | External | Display | ||||||
voltage | current | Active power | Reactive power | Power factor | Frequency | Active energy | Reactive energy | ||||||||
PD7777-3H | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | 96×96 | Color LCD graphic display | |
PD7777-8H | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | 120×120 | |
Note:
●means the intrinsic functions of the instrument.
3. Main technical performance and parameters:
Technical parameters | index | ||
Connection mode | Three phase three wire or three phase four wire optional | ||
Input |
Voltage | Rated value | AC100V, 220V, 380V |
Overload | Continuous: 1.2 times, instant: 2 times/1s, adopt red font identification when out of 1.2 times of the rated value | ||
Consumption | <2VA(each phase) | ||
Resistance | >500kΩ | ||
Current | Rated value | AC1A, 5A | |
Overload | Continuous: 1.2 times, instant: 10 times/5s, adopt red font identification when out of 1.2 times of the rated value | ||
Consumption | <1VA(each phase) | ||
Resistance | <20mΩ(each phase) | ||
Measuring rang of the frequency | 45Hz-65Hz | ||
Output |
Display mode Measuring accuracy | 3.5 inch/4.3 inch lattice LCD Voltage Class 0.2 Resolution 0.1V Frequency Class 0.2 Resolution 0.01Hz | |
Electric energy | Energy measurement | Support positive/negative measurement active(reactive) energy | |
Pulse constant | Active power: 10000imp/kWh, Reactive power: 10000imp/kvarh | ||
Pulse signal output | Provide 2 sets(active/reactive energy) of optical signal and optocoupler isolated open collector electrical signal pulse output | ||
Communication | Mode | RS-485 | |
Protocol | MODBUS-RTU | ||
Baud rate | 1200bps, 2400bps, 4800bps, 9600bps, 19200bps, assumed to be 9600bps | ||
Switch quantity input | 4-way passive dry node input mode | ||
Switch quantity output | Support 4-way relay-state output, relay contact capacity:AC250V/2A, DC30V/2A(-3H only has 2-way) | ||
Analog quantity output | Current output: DC0mA~10mA, DC0mA~20mA, DC4mA~20mA, Class 0.5(-3H without this function) | ||
Switch quantity input | 4-way passive dry node input mode | ||
Harmonic | 2nd ~31st harmonic of voltage/current | ||
Calendar clock | Clock error: 0.5s/d (reference temperature: 23℃) | ||
USB interface | Host mode(-3H without this function) | ||
Working power supply | Range | AC/DC85V~264V | |
Consumption | ≤15VA | ||