Primary and Secondary Integrated Ring Main Unit
ZTH-12(V)/630-20、ZT-D30
The 10kV Primary and Secondary Integrated Ring Main Unit is a device that integrates power monitoring, control, protection, and management functions. It is designed for outdoor installation and is particularly suitable for 10kV distribution systems. This product, with its prefabricated interfaces for primary and secondary equipment, achieves a highly integrated design. It is easy to install and commission and features robust wireless and fiber-optic communication capabilities, enabling flexible networking and communication for outdoor equipment. It integrates protection, measurement, control, operation and maintenance, energy management, and other functions. Through wireless communication, it can transmit measured information, alarm information, fault information, and more in real-time to the energy management big data cloud, enabling centralized monitoring and remote operation and maintenance.
Main functions and characteristics

1) Power Distribution: Achieve flexible power distribution through a ring network structure, support multiple circuit outputs to meet different load requirements, optimize the distribution network, and reduce power transmission losses.

2) Circuit Control: Equipped with load switches, circuit breakers, or isolating switches to connect, disconnect, and switch circuits. Support manual, electric, or remote operation to enhance operational convenience and efficiency.

3) Protection Functions: Provide overload, short-circuit, and ground fault protection to ensure the safety of equipment and lines. Integrate fuses or relay protection devices to quickly cut off faulty circuits.

4) Monitoring and Metering: Real-time monitoring of parameters such as current, voltage, and power factor to optimize power usage. Integrate power metering functions and support energy consumption analysis and energy management.

5) Environmentally Friendly Design: Use low-energy electrical components and environmentally friendly materials to reduce energy losses during operation. Optimize heat dissipation design to lower equipment operating temperature and reduce cooling energy consumption.

6) Remote Monitoring and Operation: Support remote monitoring and operation to achieve intelligent management of the distribution system. Real-time monitoring of equipment operating status through SCADA systems or IoT technology.

7) Fault Diagnosis and Early Warning: Integrate fault diagnosis functions to promptly detect potential issues and issue warnings. Provide fault recording and analysis functions to facilitate quick problem location and resolution.

Technical parameter
  • 1. Rated Voltage (kV)
    Circuit Breaker: 12
    Load Switch: 12
  • 2. Rated Current (A)
    Circuit Breaker: 630
    Load Switch: 630
  • 3. 1-minute Power Frequency Withstand Voltage (Phase-to-Phase and Phase-to-Ground) (kV)
    Circuit Breaker: 42
    Load Switch: 42
  • 4. 1-minute Power Frequency Withstand Voltage (Isolating Distance) (kV)
    Circuit Breaker: 48
    Load Switch: 48
  • 5. Power Frequency Withstand Voltage (Control and Auxiliary Circuits) (kV)
    Circuit Breaker: 2
    Load Switch: 2
  • 6. Lightning Impulse Withstand Voltage (Phase-to-Phase and Phase-to-Ground) (kV)
    Circuit Breaker: 75
    Load Switch: 75
  • 7. Lightning Impulse Withstand Voltage (Isolating Distance) (kV)
    Circuit Breaker: 85
    Load Switch: 85
  • 8. Rated Short-Circuit Breaking Current (kA)
    Circuit Breaker: 20
    Load Switch: -
  • 9. Rated Short-Circuit Making Current (kA)
    Circuit Breaker: 50
    Load Switch: 50
  • 10. Rated Peak Withstand Current (kA)
    Circuit Breaker: 50
    Load Switch: 50
  • 11. 4S Short-Time Withstand Current (kA)
    Circuit Breaker: 20
    Load Switch: 20
  • 12. Rated Operating Sequence
    Open-0.3s Close and Open-180s-Close and Open
  • 13. Mechanical Life (times)
    Circuit Breaker: 10000
    Load Switch: 10000
  • 14. Rated Gas-Filling Pressure (Gauge Pressure at 20°C) (MPa)
    0.02
  • 15. Minimum Functional Pressure(Gauge Pressure at 20°C)(MPa)
    0
  • 16. Pressure Release Device Activation Pressure (Gauge Pressure at 20°C) (MPa)
    0.16
  • 17. Annual Leakage Rate
    ≤0.01%
  • 18. Loop Resistance per Phase(uΩ)
    Circuit Breaker: ≤150
    Load Switch: ≤150
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