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CHINT DTSU666-G PDF is a smart bidirectional energy meter specially designed for new energy scenarios such as PV and energy storage. Il adopte un montage sur rail standard DIN35 mm et présente une grande précision, high-speed refresh, et comptage bidirectionnel, adapté au photovoltaïque résidentiel, industriel & systèmes de stockage d'énergie commerciaux et applications de micro-réseaux.
- Guide de câblage: CHINT DTSU666G to Inverter Control Board (Meter-485)
| Core Feature | Description |
| Bidirectional Metering | Accurately measures forward (grid input) and reverse (new energy output) kW and kWh energy flow; supports anti‑backflow control. |
| High‑Speed Refresh | Active power refresh rate ≤ 50 ms to meet fast response requirements of new energy systems. |
| Multi‑Parameter Monitoring | Real‑time measurement of voltage, actuel, pouvoir, facteur de puissance, frequency and other full electrical parameters. |
| Fonction de communication | Interface RS485 standard, supports Modbus‑RTU protocol, connectable to energy management systems. |
| Installation facile | DIN35mm standard rail mounting, 4P. (4 modules) construction compacte (98×72×65 mm). |
| Fonctionnement à large température | Plage de température de fonctionnement: ‑25℃ to +55℃, adaptable to various outdoor distribution box environments. |
- Principales spécifications techniques
| Article | Spécification |
| Meter Type | Three‑phase four‑wire electronic energy meter (DIN‑rail type) |
| Classe de précision | Actif: Classe 0,5S / 1; Reactive: Classe 2 |
| Reference Voltage | 3×220/380 V (three‑phase four‑wire) |
| Note actuelle | 0.015‑1.5(6) UN (via transformer), compatible with 5 A secondary side of CT |
| Pulse Constant | 800 imp/kWh |
| Plage de tension | 0.8Un ~ 1.15Un |
| Consommation d'énergie | ≤ 2 W / 10 Virginie |
| Interface de communication | RS485, débit en bauds 9600/19200 bps (défaut 9600), address 1‑247 |
| Afficher | Segment LCD, supports automatic cycle display and key query |
| Classe de protection | IP20 (installation intérieure) |
| Alimentation auxiliaire | No external power supply needed; powered directly by voltage signal |
III. Differences from Standard DTSU666
| Article | DTSU666‑G (New Energy Version) | Standard DTSU666 |
| Design Scenario | Bidirectional metering for PV, energy storage and other new energy | General industrial / commercial electricity metering |
| Note actuelle | 0.015‑1.5(6) UN (more suitable for transformer connection) | Multiple ratings including 0.25‑5(80) UN |
| Refresh Rate | ≤ 50 MS (fast response for new energy systems) | Normal refresh rate |
| Function Optimization | Enhanced bidirectional metering accuracy, optimized for anti‑backflow control | Basic electric energy metering functions |
| Champs d'application | Residential PV, industriel & commercial energy storage, microgrid systems | Industriel & mining enterprises, hôtels, écoles, etc.. |
- Scénarios d'application typiques
- Residential PV Systems: Meter bidirectional energy for self-consumption and grid-feed surplus power, working with inverters for anti-backflow control.
- Industriel & Commercial Energy Storage Systems: Monitor energy flow during charging and discharging to optimize energy efficiency.
- Microgrid Systems: Realize bidirectional metering and monitoring between distributed energy sources and main grid.
- Charging Pile Management: Accurately measure power consumption of three-phase charging piles, supporting remote meter reading and data analysis.
- Installation & Remarques sur l'opération
- Montage: Standard DIN35mm rail mounting, 4P width, convient pour une installation dans des boîtes de distribution.
- Câblage: Système triphasé à quatre fils; phases A, B, C connected to terminals 1, 3, 5 respectively; neutre (N) au terminal 7; secondary side of current transformers connected to corresponding current terminals.
- Paramétrage: Enter programming menu via SET key; default password 700; CT ratio, PT ratio, paramètres de communication, etc.. can be configured.
- Configuration des communications: Supports Modbus-RTU protocol; default baud rate 9600 bps, pas de parité, 1 peu d'arrêt.
- Sélection & Informations de commande
Modèle complet: DTSU666-G 3×220/380V 0.015-1.5(6)A 4P
Matching Suggestion: Used with CHINT current transformers (par exemple. BH-0.66 série); select ratio according to actual load.
Modèles alternatifs: Single-phase new energy meter: DDSU666-G; triphasé à trois fils: DSSU666-G
CHINT DTSU666-G vs DTSU666: Différences fondamentales & Interchangeability Analysis
Conclusion fondamentale: DTSU666-G is the new energy dedicated version (optimized for PV/energy storage), while DTSU666 is the general-purpose version. They can be temporarily substituted in basic metering scenarios, but DTSU666-G is strongly recommended for new energy systems to ensure bidirectional metering accuracy and fast response.
- Overview of Core Differences
| Dimension | DTSU666‑G (New Energy Version) | DTSU666 (General Version) | Impact |
| Design Purpose | Bidirectional metering for PV/energy storage, compatible with anti‑backflow control | Basic electric energy metering for industrial / commercial / residential use | Optimization direction determined by application scenario |
| Note actuelle | 0.015‑1.5(6) UN (transformer connection only) | 0.25‑5(80) UN (connexion directe) / 0.1‑1.5(6) UN (transformer connection) | Large difference in connection method and range affects selection |
| Active Power Refresh Rate | ≤ 50 MS (high‑speed response) | Normal rate (environ. 500 MS) | New energy systems require fast power change detection for anti‑backflow control |
| Bidirectional Metering Accuracy | Enhanced design to meet new energy grid‑connection requirements | Basic bidirectional metering, focuses on forward direction | DTSU666‑G provides more accurate metering for grid‑feed surplus scenarios |
| Function Optimization | Adapted for PV inverter control, supports zero‑power output detection | Standard energy metering, no new energy‑specific optimization | DTSU666‑G is more reliable in anti‑backflow protection systems |
| Scénarios d'application | Residential PV, industriel & commercial energy storage, microgrids | Industrial enterprises, hôtels, écoles, general buildings | Performance depends on scenario matching |
- Detailed Technical Parameter Differences
- Note actuelle & Méthode de connexion
DTSU666-G: Only available in 0.015-1.5(6) A transformer-connected version, designed specifically for 5 A CT secondary side, suitable for high-current measurement in new energy systems.
DTSU666: Offers multiple ratings including 0.25-5(80) A direct-connected and 0.1-1.5(6) A transformer-connected types for various load scenarios.
- Performance Differences
Active power refresh rate: DTSU666-G ≤ 50 MS (for fast response in new energy systems); DTSU666 uses normal refresh rate (environ. 500 MS).
Starting current: DTSU666-G has lower starting current (0.001Dans), suitable for low-power output measurement in new energy systems.
Metering accuracy: Both have active Class 0.5S/1, but DTSU666-G offers better consistency in bidirectional metering.
- Software Function Differences
DTSU666-G integrates new energy-specific algorithms optimizing bidirectional power calculation and anti-backflow control logic.
DTSU666 uses general metering algorithms, more suitable for unidirectional or balanced loads.
Both support Modbus-RTU over RS485, but some register addresses in DTSU666-G are optimized for new energy parameters.
III. Interchangeability Analysis
- Interchangeable Scenarios (Temporary Substitution)
Basic energy metering: In general industrial/commercial scenarios where only forward energy measurement is needed, they can be temporarily interchanged (current rating must match).
Parameter monitoring: Functions are consistent when only basic electrical parameters such as voltage, current and power are monitored.
Communication integration: Same Modbus-RTU protocol supported, can access the same energy management system.
- Scenarios Not Recommended for Interchange (Must Match Model)
| Scénario | Modèle recommandé | Raison |
| PV Grid‑Feed Surplus | DTSU666‑G | Requires high‑precision bidirectional metering; DTSU666‑G has faster refresh and better anti‑backflow adaptation |
| Energy Storage Charge/Discharge Management | DTSU666‑G | Frequent charge/discharge switching requires ≤50 ms fast response to avoid metering errors |
| Anti‑Backflow Control Systems | DTSU666‑G | Dedicated algorithm ensures accurate zero‑power output detection and prevents grid fluctuations |
| Small Load Direct Connection | DTSU666 | DTSU666‑G has no direct‑connected version and cannot adapt to 0.25‑5(80) Une charge |
| Power Department Assessment Metering | Per local requirements | Must comply with grid metering standards; some regions explicitly require new energy‑specific meters |
- Notes on Interchange
- Current rating matching: Connection method (direct/transformer) and range must match actual load.
- Paramétrage: Après remplacement, reset CT/PT ratio, communication address and other parameters; default password for both is 700.
- Function limitation: Replacing DTSU666-G with DTSU666 loses high-speed refresh and anti-backflow adaptation, which may reduce system control accuracy.
- Recommandations de sélection
- Nouveaux systèmes énergétiques: Prioritize DTSU666-G to ensure bidirectional metering accuracy and system compatibility.
- General industrial/commercial use: Choose DTSU666, select direct or transformer connection based on load type.
- Retrofit projects: When upgrading existing DTSU666 systems to PV/energy storage, replace with DTSU666-G to avoid metering errors and control issues.
