As digitalization accelerates across distribution networks, utilities now require devices that go far beyond the basic measurement capability of a traditional energy meter. The DZS320 Low-Voltage Distribution Monitoring Terminal enables full visibility, fault analytics, and intelligent O&M — all while supporting live installation without interrupting power supply.

For large-scale retrofit projects across residential communities and aging DTAs, the DZS320 Low-Voltage Distribution Monitoring Terminal, developed by Heyuan Intelligence,has quickly become the preferred solution for grid operators.

Learn more about Heyuan’s smart distribution technologies here: https://www.heyuanintel.com/

1. Why DZS320? Pain Points in Legacy DTA Upgrades

Traditional residential communities and old DTAs often face several challenges during retrofit projects:

●Wide-area power outages affecting many users

●High engineering workload and overall cost

●Complex construction and long time cycles

●Insufficient low-voltage monitoring capability compared with the limited insights provided by legacy energy meters

DZS320 solves these issues by enabling live installation on energized low-voltage circuits, allowing deployment without interrupting user power supply. This brings major improvements in cost efficiency, construction speed, and user impact, making DZS320 ideal for large-scale retrofit scenarios.

For more products from Heyuan Intelligence: https://www.heyuanintel.com/Electricity_Meters.html

2. Typical Application Scenarios

1) Residential Community Distribution Network Monitoring

Installed in feeder cabinets, distribution boxes, or meter boxes to enable:

①Full visibility of all electrical parameters along the DTA

②User-side anomaly detection (overcurrent, undervoltage, etc.)

③Accurate fault section location

When deployed alongside existing energy meter infrastructure, it forms a complete, multi-point monitoring network for low-voltage visibility.

2) PV-Integrated DTA Management

Installed at PV interconnection points or LV branches to collaborate with smart DTUs and handle issues such as:

①Voltage fluctuations under high PV penetration

②Reverse power flow and associated feeder overload

③Instability caused by distributed PV inverters

This ensures safer and more controllable grid-PV integration.

3) Legacy Grid Retrofit & Status Visualization

Installed at LV outlets of switch stations or transformer rooms to support:

①Heavy-load feeder monitoring

②Joint temperature overheat warnings

③Environmental anomaly detection (humidity, water ingress, etc.)

This dramatically enhances safety and management capability for aging distribution networks.

4) Load Management in EV-Charging Areas

Real-time monitoring of:

①EV connection status

②Charging behavior and power profiles

③Load surge during clustered charging

Together with orderly charging strategies, the DZS320 prevents DTA overloads that conventional energy meters cannot detect in real time.

5) Additional Extended Applications

DZS320 can act as:

①IoT data acquisition node in DTAs

②Edge monitoring unit in distribution grids

③Online power quality monitoring point

A supplementary smart energy meter node where more granular monitoring is required

3. Core Functions of DZS320

1) Multi-Dimensional Data Acquisition

The device collects a wide range of electrical and environmental data, including:

●Phase voltage and current

●Active/reactive power

●2nd–21st harmonic content

●Cable temperature; meter-box temperature & humidity

●Water ingress detection

All data can be reported to the control center in real time for digital analytics.

2) Fault Monitoring & Intelligent Event Reporting

DZS320 automatically detects and logs:

●Overvoltage/undervoltage

●Undercurrent/overcurrent

●Feeder over-temperature

●Outage, short-circuit, phase-loss events

Some versions also support telemetry and remote control, assisting rapid fault isolation and emergency handling.

3) Data Freezing & Local Storage

Supports:

●15-minute frozen electrical data

●Monthly energy logs

●Historical fault event records

Useful for line-loss analysis, fault tracing, and operational trend insights.

4. Why DZS320 Excels at Live Installation? Key Advantages

1) Flexible Installation with Live Working Support

Designed specifically for complex retrofit environments, featuring:

●DIN-rail mounting

●Pierce-type power extraction

●Split-core current sensors

This enables fast installation under energized low-voltage conditions, minimizing user interruptions and improving engineering efficiency.

2) Multiple Communication Options for Reliable Data Delivery

Supports a rich set of communication modes:

●LoRa

●PLC

●RS485

●CAT.1

●4G

A super-capacitor provides a 40-second backup power supply during feeder loss, ensuring no critical event data is lost — a capability standard energy meter devices cannot guarantee.

3) Enables Fine-Grained O&M

With full data visibility, DZS320 supports:

●Phase-by-phase and period-based line-loss analysis

●Early warning for equipment risks

●Transition from reactive repair to proactive maintenance

It forms a data foundation for Transparent DTAs and intelligent distribution networks.

4) Broad Industry Applicability

DZS320 is suitable as a front-end device for systems such as:

●Smart distribution automation

●Energy consumption monitoring

●Demand-side management

●Smart electrical safety

Applicable to:

●Commercial buildings

●Municipal/public facilities

●Industrial automation

●New build and retrofit projects

Browse Heyuan Intelligence’s industry solutions:https://www.heyuanintel.com/ABOUT_US.html

5. Case Study: Achieving Low-Voltage Transparency in a Residential Community

In a community DTA transparency project, multiple DZS320 units were deployed at feeder cabinets and branch boxes. Data was integrated into a distribution automation platform to enable:

1）Full visibility of LV feeder status

2）Automatic fault alarms

3）Accurate fault section location

4）Early detection of abnormal user loads

Before the upgrade: manual, step-by-step on-site inspection was required.
After the upgrade: O&M staff can view status online and resolve risks proactively.

This shift from reactive repair to proactive warning significantly improved supply reliability.

Glossary

DTA (Distribution Transformer Area)
A basic power-supply management unit centered on a distribution transformer, including its LV feeders and covered users.

Transparent DTA
A digitally enabled DTA with visualized operating status, online data, and intelligent fault localization.