Default Current Test Method of Impulse Voltage Mixed High Voltage Direct Current Converter Valve

• US 20130193998A1
• Filed: 06/16/2011
• Published: 08/01/2013
• Est. Priority Date: 12/01/2010
• Status: Active Grant

• Current Assignee: Chong Gao, Guangfu Tang, Jun Yang, Kunpeng Zha
• Original Assignee: Chong Gao, Guangfu Tang, Jun Yang, Kunpeng Zha
• Inventors: Tang, Guangfu, Zha, Kunpeng, Yang, Jun, Gao, Chong
• Granted Patent: US 9,041,426 B2
• Time in Patent Office: Days
• US Class Current: 324/764.01
• 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 31/263 for testing thyristors
• CPC Class Codes: G01R 31/3271 of high voltage or medium voltage devices G01R31/333 takes precedence
• CPC Class Codes: G01R 31/3336 Synthetic testing, i.e. with separate current and voltage generators simulating distance fault conditions
• CPC Class Codes: G01R 31/40 Testing power supplies testing photovoltaic devices H02S50/10

Abstract

The test method of this invention is comparatively simpler without high voltages in normal default current tests, high voltages have been replaced by impulse generator employing positive and negative symmetrical voltages mixed with impulse voltages to form asymmetrical forward and reverse high voltages, meanwhile the timing for impulse voltage is flexible, the amplitudes could be continuously adjustable according to specific needs, to make test voltage exactly reach climax upon certain timing, the test is flexible and safe, to be applied to converter valves in different direct currents.

Claims

1. One default current test method of impulse voltage mixed high voltage direct current converter valve, the apparatuses in said method comprises test valve (1), direct current supply (2), auxiliary valve (3), default current supply (4), it characterized in that, the apparatuses in said method comprises impulse generator (5);

the said impulse generator 5 series connects auxiliary valve (3) after parallel connecting test valve(1);

the said test valve (1) series connects auxiliary valve (3) to form bridge of (6) pulse bridge rectifier B6;

the inductance L of said default current supply (4) parallel connects impulse generator (5).

2. The default current test method of impulse voltage mixed high voltage direct current converter valve in claim 1, the default current supply (4) of test apparatuses comprise direct current supply T1, regulator T2, capacitor, reactor, isolation valve and switch;

capacitors include successively parallel connecting capacitor C1, C2, C3, reactor is L, isolation valves include successively parallel connecting isolation valve V1, V2, V3, resistance is R, switches include successively parallel connecting switches S1, S2 and S3;

The said isolation valves V1, V2 and V3, capacitors C1, C2 and C3, switches S1, S2 and S3 series connect reactor L successively;

the said resistance R series connects switches S1, S2 and S3;

the output of said direct current supply T1 connects resistance R;

the said resistance R connects switches;

the said switches S1. S2 and S3 separately connect isolation valve V1, V2, V3;

the said regulator T2 parallel connects direct current supply T1.

3. The default current test method of impulse voltage mixed high voltage direct current converter valve in claim 1, the direct current supply (2) of test apparatuses comprises huge current transformer T, breaker, isolation switch, limiting reactor, reactor Lh and L1, and 6 pulse bridge rectifier B6;

the said huge current transformer T, breaker, isolation switch and limiting reactor successively series connect;

the output of 6 pulse bridge rectifier B6 connects successively series connect reactor Lh and L1.

4. The default current test method of impulse voltage mixed high voltage direct current converter valve in claim 1, the said method comprises following steps:

A. the said direct current supply (2) working to make output current reach heating point, the switch of default current (4) closing for charging capacitors to make capacitor voltage reach test requirement;

B. closing the said auxiliary valve (3) to make direct current of direct current supply (2) flow into test valve (1), to heat test valve (1);

C. after the said test valve (1) being heated to certain temperature, opening isolation valve V1, V2 and V3 in default current supply (4) to make default current supply (4) flow default current to test valve (1), in order to create test valve (1) default voltage;

D. triggering the said impulse voltage generator (5) to make impulse voltage generator (5) provide test valve (1) with impulse voltage, to be mixed with default voltage of default current supply (4) to form voltage in test valve (1).

5. The default current test method of impulse voltage mixed high voltage direct current converter valve in claim 1, in the said step A, during single wave default current test, switch S1 in default current supply (4) closing for charging capacitor C1, to make voltage of capacitor C1 reach test requirement;

during triple wave default current test, switches S1, S2 and S3 of default current supply (4) separately charge capacitors C1, C2 and C3, to make voltages of capacitors C1, C2 and C3 reach test requirement.

6. The default current test method of impulse voltage mixed high voltage direct current converter valve in claim 1, in the said step C, during single wave default current test, default current supply 4 providing test valve 1 with reverse voltage and partial forward voltage after default current;

in the said step D, during single wave default current test, the said impulse voltage is forward impulse voltage, during triple wave default current test, the said impulse voltage is reverse impulse voltage being placed upon test valve (1) after second default current.

7. The default current test method of impulse voltage mixed high voltage direct current converter valve in claim 1, the said method employs symmetrical positive and negative voltages to be mixed with impulse voltage to form asymmetrical forward and reverse voltages, to make test voltages reach exactly the climax upon specific timing.