JDZX11-10C fully-enclosed and fully-insulated voltage transformer

Product Overview and Specifications

Product Definition: JDZX11-10C is a single-phase, epoxy resin cast, fully enclosed or semi-enclosed indoor voltage transformer, suitable for power systems with a rated frequency of 50Hz and a rated voltage of 10kV and below.

Model Meaning: The "JDZX" in the model usually indicates a single-phase, cast insulated voltage transformer with a residual voltage winding, "11" represents the design serial number, "10" means the rated voltage level is 10kV, and "C" may be a variant model for specific capacity or application in this series.

Key Specifications:

Structural Features: It is formed by indoor epoxy resin vacuum casting, with the characteristics of arc resistance, ultraviolet resistance and aging resistance. The appearance adopts anti-rain skirt design to increase the surface creepage distance, and the secondary outlet terminals are usually equipped with metal protective covers.

Insulation Type: It belongs to dry cast insulation, which is an ideal substitute for old oil-immersed products, with the advantages of oil-free, moisture-proof, flame-retardant, small size and maintenance-free.

Main Technical Parameters

Rated Voltage and Transformation Ratio: Its primary rated voltage is usually 10kV (system voltage), and the corresponding secondary rated voltage is 100V (for measurement and protection). If it is equipped with a residual voltage winding (open delta winding), its rated voltage is often 100/3V. The test report shows that its rated voltage is marked as "3 / 3 /3 kV", which may refer to the application configuration in a three-phase system.

Rated Insulation Level: The rated insulation level of the product is 7.2/32/60 kV (corresponding to the equipment voltage of 7.2kV, power frequency withstand voltage of 32kV, and lightning impulse withstand voltage of 60kV) to meet the insulation requirements of 10kV systems.

Accuracy Class and Rated Capacity: This type of transformer has both metering and protection functions, so it usually has different accuracy class windings. Common configurations include: metering windings (such as class 0.2, class 0.5) and protection windings (such as class 3P, class 6P). Its capacity can reach 400VA, and the rated capacity of each specific winding (such as 30VA, 50VA, 100VA, etc.) shall refer to the specific product nameplate.

Load Power Factor: The power factor requirement of the secondary load is cosφ = 0.8 (lagging).

Working Conditions:

Ambient Temperature: The temperature ranges from +45℃ to -45℃, and the average temperature does not exceed 30℃.

Altitude: No more than 1000 meters (special instructions are required if exceeded).

System Grounding Mode: Suitable for neutral point non-effectively grounded systems.

Pollution Level: The surface creepage distance meets the requirements of Class Ⅱ pollution level.

Main Applications: JDZX11-10C is mainly used in 10kV (or 6kV) neutral point non-effectively grounded power systems for the following functions:

Electric Energy Metering: Convert high voltage into low voltage to supply energy meters for billing (using high-precision windings, such as class 0.2s or 0.5).

Relay Protection: Provide voltage signals for distance protection, low voltage/overvoltage protection, directional protection and other devices (using protection windings, such as class 3P or 6P).

Voltage Monitoring and Control: Access signals to monitoring systems (SCADA), automatic devices (such as standby power automatic switching, VQC) and fault recording devices.

Insulation Monitoring: In a neutral point ungrounded system, the output of its residual voltage winding (open delta) can be used to detect single-phase ground faults in the system.

Installation Environment: This product is of indoor installation type, and is widely used in 10kV high-voltage switchgear (such as KYN, XGN and other cabinet types), high-voltage power distribution rooms and ring main units.