CN110967608A - TBS valve thyristor level off-line test circuit - Google Patents
TBS valve thyristor level off-line test circuit Download PDFInfo
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- CN110967608A CN110967608A CN201811121654.4A CN201811121654A CN110967608A CN 110967608 A CN110967608 A CN 110967608A CN 201811121654 A CN201811121654 A CN 201811121654A CN 110967608 A CN110967608 A CN 110967608A
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- thyristor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/263—Circuits therefor for testing thyristors
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Abstract
The invention relates to a TBS valve thyristor level offline test circuit. The circuit includes: a transformer, a rectifier and a double-pole double-throw switch; the input end of the transformer is connected with a power supply, the output end of the transformer is connected with the input end of the rectifier, the output end of the rectifier is connected with the common end of the double-pole double-throw switch through a current-limiting resistor, the anode of the first output end of the double-pole double-throw switch is connected with the anode of the output end of the TBS valve thyristor level off-line test circuit, the cathode of the first output end of the double-pole double-throw switch is connected with the cathode of the output end of the TBS valve thyristor level off-line test circuit, the anode of the second output end of the double-pole double-throw switch is connected with the cathode of the output end of the TBS. The TBS valve thyristor-level offline test circuit provided by the invention abandons the traditional alternating current power supply, adopts rectified direct current, and switches the direction of output voltage through a switch.
Description
Technical Field
The invention relates to a TBS valve thyristor level offline test circuit, and belongs to the technical field of power systems.
Background
In power systems, thyristor cells have a wide range of applications. At present, the triggering and state detection of the thyristor unit basically adopts the mode that an alternating current power supply is added at two ends of a thyristor, and a control system sends out a control signal to detect and trigger the thyristor unit. The alternating current power supply can charge the high-voltage processing board of the thyristor unit and simultaneously provides power for the switching-on and switching-off of the thyristor. After receiving the control signal, the high-voltage processing board of the thyristor unit needs to detect the voltage at two ends of the thyristor, and when the thyristor bears the forward voltage, the high-voltage processing board can send out a trigger pulse to trigger the thyristor, and when the voltage crosses zero, the thyristor is turned off. In this process, the sampled voltage of the control system must be synchronized with the voltage applied across the thyristor. When a converter station for direct current transmission carries out trigger test on a thyristor of a converter valve, an original incoming line of sampling voltage of a control system needs to be disconnected, then a phase is introduced from a power utilization system of a three-phase station to serve as a synchronous sampling power supply, voltage at two ends of the thyristor is also taken from a certain phase of power utilization of the three-phase station, in order to ensure that the sampling power supply and voltage applied at two ends of a thyristor unit are in the same phase and meet the requirement of synchronous voltage sampling amplitude of the control system, the phase needs to be checked through amplitude adjustment of a voltage regulator and incoming line of a phase table, and then trigger and state test can be.
Meanwhile, in the application of the thyristor bypass switch (abbreviated as TBS) technology, thyristors are not used independently, but two thyristors are connected in anti-parallel to form a thyristor unit, namely, the two thyristors are connected in anti-parallel in opposite directions and are connected in parallel. In this way, in practical application, a thyristor can be conducted all the time no matter how the current direction is, so that the protection effect is achieved. Therefore, the voltage applied to the two ends of the anti-parallel thyristor unit is required to have a positive voltage and a negative voltage at the same time, so that the forward voltage at the two ends of one thyristor is ensured to exist in the process of testing the anti-parallel thyristor unit.
Disclosure of Invention
The invention aims to solve the technical problems that: the TBS valve thyristor level off-line test circuit overcomes the defects of the prior art and provides independent power supply, so that the voltage of a test circuit is not required to be synchronous with the voltage of a control system, off-line test can be conveniently carried out, and meanwhile, the voltage output direction can be changed.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a TBS valve thyristor level off-line test circuit, comprising: a transformer, a rectifier and a double-pole double-throw switch; the input of transformer is connected the power, and the output is connected the input of rectifier, the output of rectifier passes through current-limiting resistor and connects the common terminal of double-pole double-throw switch, the positive pole of the first output of double-pole double-throw switch is connected the positive pole of TBS valve thyristor level off-line test circuit output, and the negative pole is connected the negative pole of TBS valve thyristor level off-line test circuit output, the positive pole of the second output of double-pole double-throw switch is connected the negative pole of TBS valve thyristor level off-line test circuit output, and the negative pole is connected the positive pole of TBS valve thyristor level off-line test circuit output.
The scheme is further improved in that: the rectifier is a single-phase bridge rectifier consisting of 4 oil diodes.
The scheme is further improved in that: the system also comprises valve control equipment, a thyristor-level short circuit testing module, a thyristor-level state monitoring module and an optical fiber communication module.
The TBS valve thyristor-level offline test circuit provided by the invention abandons the traditional alternating current power supply, adopts rectified direct current, and switches the direction of output voltage through a switch, thereby avoiding the defect of synchronization of test voltage and control voltage, enabling offline test to be possible, and simultaneously correctly triggering the specified thyristor according to the voltage direction.
Drawings
FIG. 1: the circuit structure of a preferred embodiment of the invention is schematic.
Detailed Description
Examples
The TBS valve thyristor-level offline test circuit of this embodiment, as shown in fig. 1, includes: a transformer, a rectifier and a double-pole double-throw switch; the input end of the transformer is connected with a power supply, the output end of the transformer is connected with the input end of the rectifier, the output end of the rectifier is connected with the common end of the double-pole double-throw switch through a current-limiting resistor, the anode of the first output end of the double-pole double-throw switch is connected with the anode of the output end of the TBS valve thyristor level off-line test circuit, the cathode of the first output end of the double-pole double-throw switch is connected with the cathode of the output end of the TBS valve thyristor level off-line test circuit, the anode of the second output end of the double-pole double-throw switch is connected with the cathode of the output end of the TBS.
When the testing device outputs forward half-wave voltage, only one thyristor corresponding to the voltage in the TBS anti-parallel thyristor testing unit can be normally triggered; after the test is passed, the negative phase half-wave voltage is switched, at the moment, another thyristor in the TBS anti-parallel thyristor test unit is normally triggered, and therefore if the test is abnormal, which thyristor loop is in a problem can be accurately judged. The positive and negative half-wave voltage outputs can be switched by a double-pole double-throw switch.
The rectifier is a single-phase bridge rectifier consisting of 4 oil diodes; the power supply can provide direct current voltage with ripples for providing forward voltage to the thyristor to be tested and charging the high-voltage processing board of the thyristor to be tested. After the trigger pulse is normally issued, the double-pole double-throw switch is turned to S1, a normal-phase rectification voltage is output at the moment, and the forward thyristors in the corresponding anti-parallel thyristor units meet the trigger condition and can be normally triggered; then, the double-pole double-throw switch is turned to S2, negative phase rectification voltage is output at the time, and the negative thyristors in the corresponding anti-parallel thyristor units meet the triggering condition and can be normally triggered; thereby satisfying the trigger test to TBS valve anti-parallel thyristor unit. After the thyristor is normally triggered, the corresponding current indicating module can display a triggering result, and whether the thyristor is normally triggered is judged according to the display result.
In order to realize rapid testing, the embodiment is further provided with automation modules such as a valve control device, a thyristor-level short circuit testing module, a thyristor-level state monitoring module, and an optical fiber communication module.
When the forward voltage is output and after the forward voltage crosses zero, the TCU returns a forward voltage establishment signal IP to the valve control equipment. The valve control equipment sends the direction trigger signal FP according to the IP signal. The forward thyristor is turned on, i.e. a forward current can be detected. When the negative voltage is output and after the negative voltage crosses zero, the TCU returns the negative voltage to establish a signal IP to the valve control equipment. The valve control equipment sends the direction trigger signal FP according to the IP signal. When the negative thyristor is conducted, the negative current can be detected. Therefore, testing of the thyristor is realized.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (3)
1. A TBS valve thyristor level off-line test circuit, comprising: a transformer, a rectifier and a double-pole double-throw switch; the input of transformer is connected the power, and the output is connected the input of rectifier, the output of rectifier passes through current-limiting resistor and connects the common terminal of double-pole double-throw switch, the positive pole of the first output of double-pole double-throw switch is connected the positive pole of TBS valve thyristor level off-line test circuit output, and the negative pole is connected the negative pole of TBS valve thyristor level off-line test circuit output, the positive pole of the second output of double-pole double-throw switch is connected the negative pole of TBS valve thyristor level off-line test circuit output, and the negative pole is connected the positive pole of TBS valve thyristor level off-line test circuit output.
2. The TBS valve thyristor-level offline test circuit of claim 1, wherein: the rectifier is a single-phase bridge rectifier consisting of 4 oil diodes.
3. The TBS valve thyristor-level offline test circuit of claim 1, further comprising: the system comprises valve control equipment, a thyristor level short circuit test module, a thyristor level state monitoring module and an optical fiber communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121654.4A CN110967608A (en) | 2018-09-26 | 2018-09-26 | TBS valve thyristor level off-line test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811121654.4A CN110967608A (en) | 2018-09-26 | 2018-09-26 | TBS valve thyristor level off-line test circuit |
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| Publication Number | Publication Date |
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| CN110967608A true CN110967608A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811121654.4A Pending CN110967608A (en) | 2018-09-26 | 2018-09-26 | TBS valve thyristor level off-line test circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0209688A1 (en) * | 1985-06-25 | 1987-01-28 | TELEFUNKEN electronic GmbH | Circuit for detecting the current flow of a TRIAC |
| CN102043107A (en) * | 2010-11-10 | 2011-05-04 | 株洲南车时代电气股份有限公司 | Cycle surge test device |
| CN102901883A (en) * | 2011-12-24 | 2013-01-30 | 许继集团有限公司 | Trigger test device for thyristor unit of converter valve |
| CN204964567U (en) * | 2015-10-12 | 2016-01-13 | 重庆平伟实业股份有限公司 | Full -bridge rectifier forward surge test fixture |
| CN106814297A (en) * | 2016-12-27 | 2017-06-09 | 天水七四九电子有限公司 | A kind of bidirectional thyristor population parameter manual test instrument |
-
2018
- 2018-09-26 CN CN201811121654.4A patent/CN110967608A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0209688A1 (en) * | 1985-06-25 | 1987-01-28 | TELEFUNKEN electronic GmbH | Circuit for detecting the current flow of a TRIAC |
| CN102043107A (en) * | 2010-11-10 | 2011-05-04 | 株洲南车时代电气股份有限公司 | Cycle surge test device |
| CN102901883A (en) * | 2011-12-24 | 2013-01-30 | 许继集团有限公司 | Trigger test device for thyristor unit of converter valve |
| CN204964567U (en) * | 2015-10-12 | 2016-01-13 | 重庆平伟实业股份有限公司 | Full -bridge rectifier forward surge test fixture |
| CN106814297A (en) * | 2016-12-27 | 2017-06-09 | 天水七四九电子有限公司 | A kind of bidirectional thyristor population parameter manual test instrument |
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Application publication date: 20200407 |