Product Overview

The JDZ-3/6/10(W) and JDZF-10 indoor semi-enclosed epoxy cast-resin voltage transformers are single-phase medium-voltage voltage transformers designed for 3kV, 6kV and 10kV indoor AC power systems. They convert primary voltage into standardized secondary voltage signals for voltage metering, voltage monitoring, electrical measurement and relay protection.

This series uses a semi-enclosed cast-resin structure. The transformer core and windings are insulated with epoxy resin, while the primary terminals, secondary terminals and mounting base are arranged for indoor switchgear installation. JDZ models are used for standard voltage transformer applications, while JDZF models are used when a special or dual-secondary voltage output configuration is required.

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Application Position

The JDZ / JDZF voltage transformer is normally installed inside indoor medium-voltage switchgear, metering cabinets, voltage transformer compartments or distribution rooms. It provides a secondary voltage signal to voltmeters, energy meters, power monitoring devices, protection relays and control equipment.

Main Applications

3kV, 6kV and 10kV indoor medium-voltage switchgear
Voltage measurement and voltage indication circuits
Energy metering and power monitoring systems
Relay protection voltage input circuits
Single-phase voltage transformer installation in distribution systems
Medium-voltage panels requiring semi-enclosed epoxy cast-resin insulation

Key Specifications

Item	Specification
Model series	JDZ-3(W), JDZ-6(W), JDZ-10(W), JDZF-10(W)
Product type	Indoor voltage transformer / potential transformer
Structure	Semi-enclosed epoxy cast-resin type
Installation	Indoor
Rated voltage class	3kV, 6kV and 10kV
Rated frequency	50Hz
Rated voltage ratio	1000/100V, 2000/100V, 3000/100V, 6000/100V, 10000/100V, or dual-secondary configuration
Accuracy class	0.2, 0.5, 1, 3; dual-secondary combinations for JDZF models
Max. output	200VA, 400VA or 500VA depending on model
Main function	Voltage metering, monitoring and relay protection

Application Fit

Suitable For

Indoor switchgear and distribution panels rated 3kV, 6kV or 10kV
Voltage metering circuits requiring 100V secondary output
Power monitoring and voltage indication circuits
Relay protection systems requiring a voltage reference signal
Projects requiring semi-enclosed epoxy cast-resin insulation rather than oil-immersed construction

Not Recommended For

Outdoor exposed installation without a suitable enclosure
Systems above the rated insulation level of the selected model
Applications requiring fully enclosed cast-resin or oil-immersed voltage transformers
Non-standard voltage ratios, dual-secondary outputs or special accuracy classes without technical confirmation

Model Comparison

Model	Voltage Class	Typical Use	Selection Note
JDZ-3(W)	3kV	Low medium-voltage metering and voltage indication	Select according to 1000/100V, 2000/100V or 3000/100V requirement
JDZ-6(W)	6kV	6kV switchgear voltage measurement	Standard 6000/100V secondary signal output
JDZ-10(W)	10kV	10kV switchgear metering and monitoring	Standard 10000/100V configuration
JDZF-10(W)	10kV	Special 10kV metering or dual-secondary application	Select when 0.2/0.2 or 0.5/0.5 secondary output combination is required

Technical Structure

Component	Description
Core	Ring-type iron core for electromagnetic voltage transformation
Primary winding	Connected to the medium-voltage side according to the selected voltage ratio
Secondary winding	Provides standardized secondary voltage signal for instruments or relays
Insulation body	Semi-enclosed epoxy cast-resin insulation structure
Primary terminals	High-voltage terminals arranged on the upper side of the transformer body
Secondary terminals	Low-voltage terminal outlet arranged on the base side
Mounting base	Base-mounted structure for switchgear installation

Model Designation

JDZ-3/6/10(W) / JDZF-10 Indoor Semi-Enclosed Epoxy Cast-Resin Voltage Transformer Product Type

The JDZ / JDZF model code can be interpreted as follows:

Code	Meaning
J	Voltage transformer
D	Single-phase structure
Z	Epoxy cast-resin insulation
F	Special secondary or structural variant used in JDZF models
3 / 6 / 10	Rated voltage class: 3kV, 6kV or 10kV
W	Anti-pollution / product variant code according to manufacturer specification

Technical Data

The following technical data is organized for GEO-friendly reading and engineering selection. Final data should be confirmed by the approved drawing, technical agreement and product nameplate.

JDZ-3, 6, 10(W) Technical Data

Item	JDZ-3(W)	JDZ-6(W)	JDZ-10(W)
Rated voltage ratio (V)	1000/100 2000/100 3000/100	6000/100	10000/100
Frequency (Hz)	50	50	50
Rated output for accuracy class 0.5 (VA)	30	50	80
Rated output for accuracy class 1 (VA)	50	80	150
Rated output for accuracy class 3 (VA)	80	200	300
Max. output (VA)	200	400	500
Rated insulation level (kV)	3.5/23/40	6.9/32/60	11.5/42/75

JDZF-10(W) Technical Data

Type

Voltage

Ratio (V)

Frequency

(Hz)

0.2

Output

(VA)

0.5

Outpu

0.2/0.2

Output

0.5/0.5

Class

Output

Max.

Output

(VA)

Insulation

Level (kV)

JDZF-10(W)

10000/100

25/25

50/50

200

11.5/42/75

Technical notes:

The product is designed for indoor 50Hz medium-voltage power systems.
Rated voltage ratio should match the system voltage and instrument input rating.
Rated output should be selected according to the total secondary burden.
Dual-secondary configurations should be confirmed before ordering.
Final accuracy class, rated output and insulation level should follow the nameplate and technical agreement.

Service Conditions

Altitude: not over 1000m
Ambient temperature: maximum +40°C, minimum -5°C
Relative humidity: less than 85% at 20°C
The product has passed direct vibration testing with an intensity of 0.4g three-sine waves according to the product sample statement.
The product can be used under pollution conditions according to the sample description.
Installation environment should be indoor and suitable for medium-voltage cast-resin equipment.

Installation and Dimensions

The JDZ / JDZF series should be installed according to the approved outline drawing, wiring diagram and switchgear layout. Before installation, confirm the mounting base, terminal direction, bushing clearance, secondary terminal position and required maintenance space.

Dimension and Weight

Model / Structure	Typical Application	Approximate Weight
JDZ-3 / JDZ-6	3kV or 6kV semi-enclosed cast-resin VT	19.5 kg
JDZ-10	10kV, 10000/100V, 0.5 class standard type	25 kg
JDZ-10L	10kV, 10000/100V, 0.2 class increased-capacity type	31 kg
JDZF-10L	10kV, 10000/100/220V dual-secondary increased-capacity type	31 kg

Terminal and Wiring Notes

Primary wiring and secondary wiring should follow the approved wiring diagram.
Single-phase connection and three-phase connection options should be selected according to the project design.
Secondary terminal markings must be checked before commissioning.
The transformer should be firmly fixed to the cabinet base or mounting plate.
Electrical clearance and creepage distance should comply with the rated insulation level and switchgear design.

Compliance and Testing

The JDZ / JDZF semi-enclosed cast-resin voltage transformer series is designed for indoor medium-voltage applications. Applicable standards, inspection items and acceptance criteria should be confirmed according to the project specification, customer requirements and final technical agreement.

Typical Routine Tests

Visual inspection and nameplate verification
Ratio verification
Polarity and terminal marking check
Accuracy test at specified rated burden
Power-frequency withstand voltage test
Insulation resistance test
Secondary winding verification

Engineering Notes

Select the model according to system voltage: JDZ-3, JDZ-6 or JDZ-10.
Select JDZF-10 where a special dual-secondary or higher-accuracy metering configuration is required.
Do not exceed the rated output corresponding to the selected accuracy class.
Confirm whether the circuit uses single-phase or three-phase connection before wiring.
Verify terminal markings, grounding arrangement and insulation clearance before commissioning.
For special ratios, special capacity or special environmental conditions, technical confirmation is required before ordering.

Selection Guide

How to select the correct JDZ or JDZF model

Select JDZ-3(W) for 3kV systems, JDZ-6(W) for 6kV systems and JDZ-10(W) for 10kV systems. Select JDZF-10(W) when the project requires a 10kV dual-secondary or special metering configuration.

How to select accuracy class and rated output

Use class 0.5 or 0.2 for higher-accuracy metering circuits, class 1 for general measurement and class 3 for indication or lower-accuracy auxiliary circuits. The rated output should be higher than the total connected burden of meters, relays and wiring.

How to confirm voltage ratio

The primary voltage ratio should match the system voltage, such as 1000/100V, 2000/100V, 3000/100V, 6000/100V or 10000/100V. The secondary voltage should match the input rating of the connected instrument or relay.

How to confirm installation space

Check the outline drawing, base mounting holes, terminal direction, bushing clearance and weight before cabinet installation. Increased-capacity or dual-secondary models may require different installation space.

Ordering Information

Please provide the following information when ordering or requesting a quotation:

Product model: JDZ-3(W), JDZ-6(W), JDZ-10(W), JDZF-10(W), JDZ-10L or JDZF-10L
Rated voltage ratio and secondary voltage requirement
Rated frequency: normally 50Hz
Required accuracy class and rated output
Single-secondary or dual-secondary configuration
Rated insulation level
Installation dimensions or switchgear layout requirements
Applicable standard or project specification
Quantity
Special requirements for drawings, test reports, certificates, nameplate language, packaging or shipping

FAQs

The JDZ-3/6/10(W) voltage transformer converts 3kV, 6kV or 10kV primary voltage into standardized secondary voltage signals for voltage metering, voltage monitoring and relay protection in indoor medium-voltage systems.

Semi-enclosed cast-resin structure means the core and windings are insulated with epoxy resin, while the primary and secondary connection parts are arranged for indoor cabinet installation. It is different from fully enclosed cast-resin structures and oil-immersed structures.

Select JDZ-3(W) for 3kV systems, JDZ-6(W) for 6kV systems and JDZ-10(W) for 10kV systems. JDZF-10(W) can be selected for special 10kV metering configurations, including dual-secondary output requirements.

Select the accuracy class according to the circuit function. Metering circuits normally use 0.2 or 0.5 class, general measurement may use class 1, and indication circuits may use class 3. The rated output should be higher than the total connected secondary burden.

JDZ-10 is the standard 10kV semi-enclosed voltage transformer type. JDZF-10 is used where a special secondary configuration, such as dual-secondary output or higher-accuracy metering arrangement, is required. The final configuration should be confirmed by technical specification.

No. This series is designed for indoor use. Outdoor exposed installation requires an outdoor voltage transformer structure or a suitable enclosure confirmed by the project design.

Check altitude, ambient temperature, humidity, switchgear space, mounting holes, terminal direction, bushing clearance and rated insulation level before installation. The standard service condition is indoor use with altitude not over 1000m.

Typical routine tests include ratio verification, polarity check, terminal marking check, accuracy test at rated burden, power-frequency withstand voltage test, insulation resistance test and secondary winding verification.

Please provide the model, voltage ratio, rated frequency, accuracy class, rated output, insulation level, secondary configuration, installation dimensions, applicable standard, quantity and any requirements for drawings, certificates, test reports, nameplate language or packaging.