Transformer Induced Voltage Test
Transformer induced voltage and induced withstand tests require a controllable AC excitation source matched to the required test voltage, frequency, capacity and transformer test arrangement. SDACME provides variable-frequency test power supplies for power transformer testing, with configurable output for induced voltage test applications.
Variable-Frequency Excitation
Power Source for Transformer Induced Voltage Testing
Output capacity, voltage, frequency and connection are selected according to the transformer and the applicable test requirements.
Induced Voltage Testing
What Is a Transformer Induced Voltage Test?
A transformer induced voltage test uses controlled AC excitation to establish the required electrical test condition in the transformer under test. From the power-source side, the key project requirements are the required voltage, frequency, power capacity and output configuration.
The variable-frequency power supply provides the excitation power required for the transformer test. It is one part of the overall test arrangement, rather than the complete transformer test system by itself.
What the Power Source Provides
- Controlled AC output voltage
- Adjustable output frequency
- Required test power capacity
- Transformer-isolated sine-wave output
What the Complete Test Arrangement May Include
Transformer-side connections, voltage measurement, protection, instrumentation and, where required, partial-discharge measurement are configured according to the transformer and the applicable test procedure.
Controllable Excitation
Variable-Frequency Excitation for Induced Testing
The excitation source should provide a controllable frequency range that can be configured for the transformer and the applicable induced-voltage test procedure, rather than being limited to the incoming mains frequency alone.
The required test frequency is determined by the transformer test requirement and the applicable procedure. It should not be assumed that one fixed frequency applies to every transformer or every induced-voltage test.
Test Power Source
Power Source Requirements for Induced Voltage Testing
The power source must be selected according to the transformer, required excitation conditions and project test arrangement. SDACME configurations provide adjustable voltage and frequency for transformer test applications.
Capacity
5–2000 kVA
Configurable series capacity range.
Output Voltage
0–1000 V L-L
Applicable output configuration.
Frequency
45–200 Hz
Adjustable variable-frequency output.
Adjustment
0.1 Hz
Frequency adjustment step.
Frequency Stability
≤ ±0.01%
Series technical specification.
Output
Sine Wave
Three-phase, transformer-isolated output.
Conceptual Test Layout
Typical Transformer Induced Voltage Test Power Arrangement
The power source forms the excitation stage of the transformer test arrangement. The exact transformer connections, voltage measurement and instrumentation depend on the transformer design and the applicable test procedure.
Conceptual arrangement for explaining the role of the test power source. It is not a wiring diagram or a complete transformer test-system schematic.
Power-Source Scope
Adjustable AC output, variable frequency, required capacity and transformer-isolated output are configured for the application.
Project-Specific Scope
Transformer connections, instrumentation and additional test equipment are defined according to the transformer and test procedure.
Engineering Selection
How to Select the Induced Voltage Test Power Source
Power-source selection starts with the transformer and the required test conditions. Supplying the following project information allows the required capacity, voltage, frequency and output configuration to be reviewed. For a broader overview of power-source selection across different transformer test duties, see our transformer test power supply guide.
Transformer Type & Rating
Provide transformer type, rated power and relevant winding information.
Required Test Voltage
State the required test condition or target excitation requirement.
Test Frequency / Procedure
Provide the required frequency or applicable transformer test procedure.
Required Test Capacity
Provide known excitation current, capacity or related test-load information.
Available Input Supply
Confirm the power available at the transformer test site.
PD Measurement Requirement
State whether partial-discharge measurement is included in the test arrangement.
Send the transformer data and test conditions. SDACME can review the suitable variable-frequency power-source configuration for the application.
Send Transformer Test RequirementsRelated Test Terminology
DVDF, Induced Withstand and ACLD Test Configurations
Transformer test requirements may use several related terms. They should not automatically be treated as identical test procedures because the required voltage, frequency, duration and measurement arrangement can differ.
Induced Voltage / Induced Withstand
General terminology for transformer induced-voltage dielectric test requirements using controlled excitation.
Double Voltage Double Frequency
A commonly used transformer-test expression associated with induced overvoltage testing. Exact requirements remain procedure-dependent.
Long-Duration Induced AC Testing
Some test programs specify long-duration induced AC voltage conditions and may include additional measurement requirements.
These applications require an excitation source whose voltage, frequency and capacity can be configured for the transformer and the applicable test procedure. The exact test parameters should be confirmed project by project.
IVPD Relationship
When Partial Discharge Measurement Is Included
Excitation Power Source
Establishes the required transformer excitation condition through controlled voltage, frequency and available test power.
PD Measuring Circuit
Where PD measurement is required, the measuring circuit performs the partial-discharge measurement using the appropriate coupling and measurement equipment.
Need more detail about the relationship between the power source, coupling network and PD detector?
Transformer Partial Discharge TestOperating Visibility
Control, Monitoring and Protection for Test Operation
The power source provides operating information and protection functions required for controlled transformer test-power operation.
Monitoring
Protection
Manufacturing & Application Evidence
Built for Transformer Test Applications
SDACME has documented transformer test-station projects using high-capacity partial-discharge-free variable-frequency power sources, with project configurations ranging from hundreds of kVA to above 1 MVA.
Workshop Assembly
Real equipment manufacturing and assembly evidence for high-capacity variable-frequency test-power configurations.
Multi-Unit Manufacturing
Multiple power-source units provide visual evidence of manufacturing capability for different transformer test-project configurations.
Technical FAQ
Transformer Induced Voltage Test FAQ
Direct answers to common questions about induced-voltage test excitation, variable-frequency power sources and related transformer test arrangements.
What is a transformer induced voltage test?
A transformer induced voltage test uses controlled AC excitation to establish the required electrical test condition in the transformer under test. The excitation power source must be selected for the required voltage, frequency and power capacity.
What type of power source is used for an induced voltage test?
A controllable AC test power source with suitable voltage, frequency and capacity can be used. SDACME provides variable-frequency, transformer-isolated sine-wave power sources for transformer test applications.
Why is adjustable frequency important for induced voltage testing?
Adjustable frequency allows the excitation source to be configured for the transformer and the applicable test procedure rather than being limited to the incoming mains frequency. The exact required frequency remains test-procedure dependent.
How is the required test power capacity selected?
Capacity selection depends on the transformer, required excitation voltage, frequency, expected excitation current and the complete test arrangement. These conditions should be reviewed before selecting the power-source rating.
What is a DVDF transformer test?
DVDF commonly refers to double-voltage double-frequency transformer testing and is associated with induced overvoltage test requirements. It is related to induced voltage testing, but the exact test parameters should follow the applicable transformer test procedure.
Can partial discharge be measured during an induced voltage test?
Yes, where the applicable test arrangement includes partial-discharge measurement. The variable-frequency source provides the excitation condition, while a separate PD measuring circuit performs the partial-discharge measurement.
Project RFQ
Configure Your Transformer Induced Voltage Test Power Source
Send us the transformer rating, required test voltage, test frequency or applicable test procedure, estimated test capacity, available input supply and whether partial-discharge measurement is included. SDACME can review the suitable variable-frequency power-source configuration for your project.
Useful RFQ Information
Final power-source configuration is confirmed according to transformer data and project test requirements.
