Maksymalizacja wydajności i współczynnika mocy
A multi-function meter is an electronic instrument that measures multiple electrical parameters from a single point in a power system. Unlike traditional analog meters that show only voltage or current, this device simultaneously displays active power (kW), reactive power (kVAR), apparent power (kVA), power factor, frequency, harmonic distortion (THD), and energy consumption (kWh/kVARh). Most units connect via current transformers (CTs) and voltage transformers (PTs). Data can be read locally on an LCD or transmitted remotely through RS485 (Modbus) to a building management system (BMS) or SCADA.
| Funkcja | Opis |
|---|---|
| Real-time Parameter Monitoring | Measures volts, amps, kW, kVAR, kVA, Hz, power factor on each phase. Updates every 1 second. |
| Energy Measurement | Accumulates imported/exported active and reactive energy. Supports tariff-based billing. |
| Harmonic Analysis | Reports individual harmonics up to 31st order and total harmonic distortion (THD) for voltage and current. |
| Demand Logging | Records peak demand (kW/kVAR) over programmable intervals (15, 30, 60 min). |
| Data Logging | Stores min/max values with timestamps. Non-volatile memory retains data after power loss. |
| Communication | RS485 (Modbus RTU) standard. Optional Ethernet, Profibus, or MQTT for IoT integration. |
This table helps engineers and procurement teams quickly match the right multi-function meter to their system requirements.
| Parametr | Typical Range / Value |
|---|---|
| Input Voltage | 80–300V AC (direct) / 0–600V via PT |
| Input Current | 5A / 1A (via CT) |
| Częstotliwość | 45–65 Hz |
| Dokładność pomiaru | Class 0.5S (active energy), Class 1 (reactive) |
| Sampling Rate | 256 samples per cycle |
| Harmonic Measurement | Up to 31st order |
| Display | Backlit LCD (128×64) or TFT (optional) |
| Temperatura pracy | -20°C to +70°C |
| Power Supply | 90–270V AC/DC, <5VA |
| Communication Ports | 1x RS485 (Modbus), 1x pulse output (optional Ethernet) |
| Enclosure | IP50 (panel mount) / IP65 (optional) |
Where a Multi-Function Meter Provides Actionable Data
A power factor correction capacitor needs accurate feedback to work properly. A multi-function meter supplies that feedback — measuring kW, kVAR, THD, and PF at the point of connection. Below are typical installations where our meter helps verify capacitor switching results, detects harmonic issues before relay trips, and provides utility-grade data for energy audits.
Uses 256 samples/cycle. Works accurately even with distorted waveforms from VFDs or rectifiers. No calibration drift over 2 years.
This multi-function meter fits standard 96×96 mm cutout. Pin-compatible with older analog meters and many digital models. Typical swap takes 20 minutes including CT wiring check.
Stores import and export separately. Useful for sites with on-site solar or cogeneration. No need for two separate meters.
This multi-function meter can set a THD threshold (e.g., 10%). Its relay output triggers if exceeded, preventing nuisance capacitor bank switching in polluted grids.
Retains logs and settings via EEPROM. Works for 10+ years without maintenance. Firmware upgrade via USB port (front access).
Free configuration software (no license) and Modbus address map provided. Zhiming engineers assist with integration within 48 hours.
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Not for billing accuracy (requires Class 0.2S). But for sub-metering and internal energy management, Class 0.5S is sufficient.
Yes. It needs 90–270V AC/DC. Terminals L/N are separate from measurement inputs. Power consumption is below 5VA.
Use three CTs (one per phase) and connect voltage directly (L1, L2, L3, N). The meter calculates neutral current indirectly.
Yes, on the LCD. Press the “H” button to cycle through odd harmonics (3rd, 5th, 7th, etc.) up to 31st. For full spectrum, use Modbus.
The meter will show negative kW on that phase. Easy fix by swapping CT wires (S1/S2) without reprogramming.
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