DHP D265T – Pole Top Circuit Breaker with Digital Trip Unit
Key attributes
| Brand | Vziman |
| Model NO. | DHP D265T – Pole Top Circuit Breaker with Digital Trip Unit |
| Rated voltage | 440V |
| Rated normal current | 265A |
| Rated frequency | 50/60Hz |
| Series | DHP |
Product descriptions from the supplier
Description
DHP Circuit Breaker Description
The protection and management of MV/LV transformers in rural areas require specialized pole mounted Circuit Breaker solutions, and the DHP Circuit Breaker is engineered specifically to address significant load imbalances, ensuring full utilization of installed power even under unbalanced conditions. This integrated solution combines a pole mounted Circuit Breaker unit with an intelligent trip system, delivering reliable performance for rural power distribution networks.
DHP Circuit Breaker Core Components
- DHP Circuit Breaker Enclosure：The DHP Circuit Breaker features a 4-pole design (with 3 poles protected), utilizing air interruption and metal-partition arc chambers for efficient arc quenching. As a dedicated pole mounted Circuit Breaker, it is designed for outdoor rural environments, with a weather-resistant fiberglass-reinforced polyester enclosure that withstands rain, dust, and temperature fluctuations.When the DHP Circuit Breaker is open, a dedicated contact establishes a secure electrical connection between the transformer’s neutral and the system ground. When closed, an integrated spark gap limits the potential rise of the low-voltage (LV) neutral relative to ground to over 10 kV, eliminating risks of overvoltage damage in rural power grids.
- pole mounted Circuit Breaker Digital Trip Units：Paired with the pole mounted Circuit Breaker, the Digital Trip Unit provides precise protection for transformer ratings of 50 kVA or 100 kVA, compatible with both conventional transformers (without internal protection) and new transformers with integrated protection (TPC).A selector switch on the DHP Circuit Breaker allows users to set the appropriate transformer protection rating. The microcontroller continuously estimates the transformer’s probable temperature by analyzing three-phase currents and external ambient temperature—calculated via a sensor and a mathematical model that incorporates current data for compensation.If this Digital Trip Unit is integrated into an older-generation pole mounted Circuit Breaker, the load integrator function (if present) will be deactivated to ensure compatibility.
DHP Circuit Breaker Features
- Unbalanced Load Handling：The DHP Circuit Breaker is optimized for rural power grids, managing significant load imbalances to ensure full utilization of installed power, a critical advantage for pole mounted Circuit Breaker in remote areas.
- Dual Protection Mechanism：The pole mounted Circuit Breaker combines arc quenching with neutral-to-ground protection, while the Digital Trip Unit adds temperature-based overload protection, creating a multi-layered safety system.
- Rural Environment Resilience：The DHP Circuit Breaker’s fiberglass-reinforced polyester enclosure is weather-resistant and corrosion-proof, ensuring reliable operation in dusty, humid, and temperature-variable rural conditions.
- Flexible Compatibility：The pole mounted Circuit Breaker works with both legacy and modern transformers, supporting TPC-integrated units, which reduces the need for full equipment replacement in rural grid upgrades.
DHP Circuit Breaker Technical characteristics
|
Device name
|
D265T
|
|
Tension
|
440V
|
|
Power
|
160 KVA
|
|
Nominal stream
|
265 A
|
|
Nominal section
|
50 - 150mm²
|
|
Equipment included
|
Operating Rod System
|
|
Contractual guarantee
|
1 YEAR
|
|
Country of origin
|
FRANCE
|
|
disconnectors - pole mounted
|
D165T
|
D265T
|
|---|---|---|
|
Reference Standard
|
HN 63-S-11
|
HN 63-S-11
|
|
Rated Voltage
|
440 V
|
440 V
|
|
Rated Current
|
165 A
|
265 A
|
|
Breaking Capacity
|
4,000 A
|
6,400 A
|
|
Closing Capacity
|
6,800 A
|
11,700 A
|
|
Number of Poles
|
4
|
4
|
|
Number of Outlets
|
1 outlet
|
2 outlets
|
|
Cable Cross - Section
|
25 / 70 mm²
|
50 / 150 mm²
|
|
Dielectric Withstand
|
||
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• Impulse / Mass
|
20 kV
|
20 kV
|
|
• 50 Hz
|
10 kV
|
10 kV
|
|
• Between Poles
|
4 kV
|
4 kV
|
|
Control Device
|
Manual
|
Manual
|
|
Installation
|
On Pole
|
On Pole
|
Additional Application Scenario
- Targeted Unbalanced Load Management：The DHP Circuit Breaker, as a specialized pole mounted Circuit Breaker, actively manages the unbalanced three-phase loads from irrigation pumps and motors, ensuring transformers operate at full capacity without unnecessary tripping, maximizing irrigation efficiency during critical planting and harvesting seasons.
- Cost-Effective Pole-Mounted Installation：As a pole mounted Circuit Breaker, it can be installed directly on utility poles near irrigation pump stations, eliminating the need for costly ground-level enclosures and reducing the civil construction investment for rural irrigation power systems.
- Farmland-Ready Environmental Resilience：The DHP Circuit Breaker features a weather-resistant fiberglass-reinforced polyester enclosure that withstands harsh farmland conditions such as dust, rain, and UV exposure, ensuring long-term stable outdoor operation.
- Proactive Transformer Thermal Protection：The integrated Digital Trip Unit of the DHP Circuit Breaker provides real-time temperature monitoring, protecting transformers from overheating during prolonged irrigation cycles and reducing downtime and maintenance costs for rural farming communities.
Q: How does the DHP Circuit Breaker handle unbalanced loads in rural power grids?
A:
The DHP Circuit Breaker features a 4-pole design with 3 protected poles, using air interruption and metal-partition arc chambers for arc quenching. It is optimized to address the unbalanced three-phase loads common in rural agricultural irrigation, ensuring the transformer operates at full capacity without unnecessary tripping. This capability is a key advantage over basic pole mounted Circuit Breaker models that may trip prematurely under imbalanced conditions.
