JDZ12(A) Voltage Transformer Series

The JDZ12(A)-3,6,10R Single-Phase Cast-Resin Voltage Transformer 3/6/10kV with Fuse Protection is a single-phase instrument transformer for voltage measurement and voltage input to metering and protective devices in distribution equipment. The series includes JDZ12A-3R, JDZ12A-6R and JDZ12A-10R. Select the exact configuration according to system voltage, ratio, accuracy class, secondary burden, winding arrangement and primary connector requirements.

In the designation, J means voltage transformer, D means single phase, Z means cast insulation, 12 is the design serial number, A is the structure code, 3, 6 or 10 identifies the voltage class, and R denotes fuse protection. Product material identifies cast-resin insulation. Available image text identifies an epoxy-cast winding, elbow primary bushing and steel mounting base. These facts identify the series; the approved model drawing remains the installation reference.

Published Configuration Data

The 3 kV and 6 kV models list 30 VA at class 0.2, 50 VA at class 0.5, 250 VA at class 1 and 400 VA at class 3, with a 1000 VA limit output. The 10 kV values depend on ratio. For 10000/100 and 10000/220, the data lists combined-winding values of 20/20 and 20/30 for 0.2/0.2 and 0.2/0.5, plus 50/50 for 0.5/0.5, with a 500/500 limit output. For 10000/100/100, it lists 0.2/3---30/400 and 0.5/3---90/400, with an 800/1000 limit output. Verify the selected ratio and winding arrangement in the approved documentation.

Functional Features

• Single-phase cast-resin construction: the series is a cast-insulation voltage transformer with an epoxy-cast winding identified in image material.
• Fuse protection: the R code denotes fuse protection; supplied diagrams show a fuse on each primary terminal.
• Voltage-class selection: configurations are published for 3 kV, 6 kV and 10 kV systems.
• Accuracy and output options: classes 0.2, 0.5, 1 and 3 are listed, alongside combined-winding options where applicable.
• Primary interface context: the A version is described with American-type 200A large-diameter elbow plug connectors.

A listed accuracy class does not by itself approve a circuit. The selected burden, secondary arrangement, interface and grounding detail must also align with the design. Start with voltage class and ratio, then review accuracy, burden and winding requirements. If site conditions or circuit requirements differ from the published data, obtain confirmation through the applicable engineering documentation.

Selection and Installation Review

Voltage and ratio

Use the stated 3000/100 ratio for JDZ12A-3R and 6000/100 for JDZ12A-6R only where they match the project. At 10 kV, distinguish among 10000/100, 10000/220 and 10000/100/100 before comparing output values. A higher voltage class is not a substitute for the correct ratio and insulation-level combination.

Interface and dimensions

The A structure code matters where the project expects the large-diameter 200A elbow plug interface. Check cable entry, termination geometry, clearance and maintenance access before installation. The supplied drawing includes dimensions such as 360, 260, 180, 150, 132.5, 197.5, 250, 300, 282, 80, 55 and 39 mm across different views. It does not declare one overall envelope, so use the approved drawing for layout rather than quoting one view as a universal footprint or height.

Applications and System Compatibility

The series is intended for voltage measurement in 3 kV, 6 kV and 10 kV distribution systems and voltage input to metering and protective devices. The supplied information describes a unit connected between primary lines A and B, with secondary terminals a and b, b earthed, and a voltmeter across the secondary. Another arrangement shows two units on A-B and A-C of a three-phase line. Final wiring, grounding and relay settings must follow the project design.

For a power distribution panel, the published data can support initial selection when voltage class, ratio and connector arrangement match the installation. In a metal-clad switchgear cabinet, available OCR identifies a cabinet-mounted, single-phase cast-resin unit, but cubicle layout, cable interface and clearances still require confirmation. The product is not a generic substitute for switchgear replacement parts; retrofit work requires checks of mechanical fit, electrical rating and protection coordination.

Technical Inquiry Checklist

• State the required 3 kV, 6 kV or 10 kV system class.
• Identify the applicable published voltage ratio.
• Specify accuracy class, secondary output and limit-output requirement.
• Confirm secondary-winding quantity and intended metering or protection connection.
• Confirm whether the A-version large-diameter 200A elbow plug interface is needed.
• Review mounting, connection, clearance and maintenance access on the source drawing.

The JDZ12(A)-3,6,10R Single-Phase Cast-Resin Voltage Transformer 3/6/10kV with Fuse Protection should be specified by exact model and ratio, not by a broad product name alone. The supplied commercial data lists MOQ 1, T/T payment terms and delivery within 20 days after receipt of payment; reconfirm these terms for the selected configuration and order conditions before procurement or energization.