DC high potential insulation breakdown test system and method

• US 10,310,006 B2
• Filed: 10/30/2013
• Issued: 06/04/2019
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Hubbell, Inc.
• Original Assignee: Hubbell, Inc.
• Inventors: Brower, John Edward
• Primary Examiner(s): Assouad, Patrick
• Assistant Examiner(s): Nasir, Taqi R
• Application Number:
  US14/067,568
• Publication Number:
  US 20140266233A1
• Time in Patent Office: 2,043 Days
• Field of Search: 324509, 324541, 324544, 324551, 324557, 324508, 324512, 324520, 324521, 324522, 324523, 324531, 324 7613, 324 731, 324 74, 324 99 R
• CPC Class Codes: G01R 31/14 Circuits therefor , e.g. for generating test voltages, sensing circuits G01R31/1209 - G01R31/1227 take precedence; for testing switches G01R31/327
• CPC Class Codes: G01R 31/3336 Synthetic testing, i.e. with separate current and voltage generators simulating distance fault conditions

Abstract

Test system and method comprise a controller, which can be microprocessor derived and include operating system for programmability, to control low voltage signals and feedback for managing the test system. High potential test system can include an amplifier comprising solid-state and/or passive components amplifying lower voltage signal to produce higher voltage output signal based on signal monitoring and control provided by controller. Controlled higher voltage output signal can be injected into high voltage multiplier circuit resulting in high DC voltage output voltage up to 50 kV or higher range. The monitoring can include feedback indicative of higher voltage signal output of amplifier and/or high DC voltage output voltage of high voltage multiplier circuit. System feedback and control can be fully automated, or selectively user-controlled via a user interface providing continuous and/or selective monitoring and display of system parameters and measured signal inputs and/or outputs.

Claims

1. A test system comprising:

a driver circuit receiving a control signal and a first voltage signal, and outputting a second voltage signal based on the received control signal, said second voltage signal having a greater amplitude than said first voltage signal;

an amplification circuit receiving the second voltage signal and amplifying the second voltage signal to output a high voltage signal;

a controller outputting the control signal to the driver circuit, the controller receiving a first feedback signal from an output of said amplification circuit comprising at least one first characteristic of the high voltage signal, and the controller receiving a second feedback signal from an output of said driver circuit comprising at least one second characteristic of the second voltage signal, the controller selectively modifying the control signal based on at least one of the first and second feedback signals to control at least the second voltage signal output from the driver circuit;

an interface for selective activation of automatic or manual operating mode, and selective entry or modification of a first information; and

a control interface in communication with the interface, the control interface selectively transmitting the first information to the controller, and selectively transmitting second information comprising the least one of the first and second feedback signals to the interface,

wherein

when the automatic operating mode is selectively activated, the controller autonomously modifies the control signal based on the at least one of the control parameters with reference to the at least one of the first and second feedback signals, and

when the manual operating mode is selectively activated, the controller selectively modifies the control signal based on at least one of the first information, the first feedback signal, and the second feedback signal.

2. The test system of claim 1, wherein:

the system further comprises a power supply receiving an alternating current (AC) voltage from AC mains and outputting the first voltage to the driver circuit,

the driver circuit comprises a pulse width modulation (PWM) amplifier receiving the first voltage from the power supply and receiving the control signal from the controller, the control signal comprising a low voltage input signal, and

the driver circuit outputs the second voltage signal comprising a PWM dependent AC signal.

3. The test system of claim 1, wherein:

the driver circuit receives the first voltage signal comprising an alternating current (AC) voltage from AC mains,

the driver circuit comprises an AC driver circuit receiving the first voltage signal and receiving the control signal from the controller, the control signal comprising an AC input control signal,

the driver outputting the second voltage signal comprising an AC signal dependent on the AC input control signal.

4. The system of claim 1 wherein the controller comprises a programmable microprocessor for selectively controlling the control signal output to the driver circuit and analyzing the least one of the first and second feedback signals according to a set of computer executable instructions.

5. The system of claim 4, wherein the instructions are stored on non-transient computer readable medium internal or external to the microprocessor, and the instructions are selectively accessible by the microprocessor via at least one of a wired and wireless communication.

6. The system of claim 1, wherein the controller selectively receives the first information comprising at least one control parameter from the control interface, and selectively transmits the second information comprising the least one of the first and second feedback signals to the control interface.

7. The system of claim 6, further comprising:

a user interface for selectively inputting the first information; and

a display providing user accessible output indicative of the least one of the first and second feedback signals.

8. The system of claim 1, wherein the controller autonomously modifies the control signal based on at least one of preset and variable autonomous control parameters with reference to the least one of the first and second feedback signals.

9. The system of claim 8, wherein the autonomous control parameters are communicated to the controller via at least one of an internal user interface and an external user interface, using at least one of a wired communication and a wireless communication.

10. The system of claim 1, further comprising:

a user interface comprising a first user input for selective activation of the automatic or manual operating mode, and a second user input for selective entry or modification of the first information, the first information comprising at least one control parameter; and

a memory storing the at least one control parameter.

20. The system of claim 8, wherein the controller autonomously modifies the control signal in a test sequence selectively accessing the at least one of preset and variable autonomous control parameters.

21. The system of claim 20, wherein at least a portion of the test sequence is selectively communicated to the controller via at least one of an internal user interface and an external user interface, using at least one of a wired communication and a wireless communication.

24. The system of claim 1, wherein the controller selectively modifies the control signal based on the first and second feedback signals to control at least the second voltage signal output from the driver circuit.

11. A test system comprising:

a driver circuit receiving a control signal and a first voltage signal, and outputting a second voltage signal based on the received control signal, said second voltage signal having a greater amplitude than said first voltage signal;

an amplification circuit receiving the second voltage signal and amplifying the second voltage signal to output a high voltage signal; and

a controller outputting the control signal to the driver circuit, the controller receiving a first feedback signal from an output of said amplification circuit comprising at least one first characteristic of the high voltage signal, and the controller receiving a second feedback signal from an output of said driver circuit comprising at least one second characteristic of the second voltage signal,

the controller selectively modifying the control signal based on at least one of the first and second feedback signals to control at least the second voltage signal output from the driver circuit,

wherein the controller comprises;

a user interface for selective entry or modification of a first information comprising at least one control parameter;

a memory storing the at least one control parameter; and

a programmable microprocessor outputting the control signal to the driver circuit; and

at least one interface to the microprocessor providing to the microprocessor at least one of the first feedback signal, and the second feedback signal,

wherein the microprocessor selectively modifies the control signal based on the at least one control parameter, stored in the memory or received from the user interface, and the at least one of the first and second feedback signals, to control at least the second voltage signal output from the driver circuit.

12. The system of claim 11, wherein the microprocessor receives the at least one of the first and second feedback signals and selectively modifies the control signal based thereon essentially in real time.

13. The system of claim 11 further comprising a control interface, wherein the microprocessor selectively receives the first information from the control interface, and selectively transmits a second information comprising the least one of the first and second feedback signals to the control interface.

14. The system of claim 13 wherein the control interface comprises at least one of a wired or wireless communication interfaces for transmitting, receiving, or transmitting and receiving at least one of the first and second information.

15. The system of claim 14, wherein the driver circuit comprises a pulse width modulation (PWM) amplifier receiving the control signal caused by the microprocessor, and the control signal comprising a low voltage signal.

16. The system of claim 14, wherein the driver circuit comprises an AC driver circuit receiving the control signal caused by the microprocessor, the control signal comprising an AC input control signal.

17. The system of claim 15, wherein the microprocessor is configured to adjust the low voltage control signal based on output from the control interface.

18. The system of claim 11, wherein the microprocessor autonomously performs the selective modification of the control signal based on the at least one control parameter stored in the memory, with reference to the at least one of the first and second feedback signals.

19. The system of claim 11, wherein the microprocessor autonomously performs the selective modification of the control signal based on the first information received via the user interface, with reference to the at least one of the first and second feedback signals.

22. The system of claim 11, wherein microprocessor autonomously performs the selective modification of the control signal in a test sequence selectively accessing the at least one control parameter.

23. The system of claim 22, wherein at least a portion of the test sequence is selectively communicated to the microprocessor via the user interface.