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Longitudinal zero-sequence voltage synthesis algorithm and turn-to-turn protection method and device

A zero-sequence voltage and synthesis algorithm technology, applied in emergency protection circuit devices, electrical components, emergency protection detection and other directions, can solve the problems of inability to realize the protection function between turns of the stator winding and hidden dangers of safe operation of the unit.

Active Publication Date: 2020-07-10
NANJING GUODIAN NANZI WEIMEIDE AUTOMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a long time, some imported units such as large gas turbine units cannot realize the inter-turn protection function of the stator winding because they are not equipped with a dedicated TV, and there are hidden dangers in the safe operation of the unit

Method used

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  • Longitudinal zero-sequence voltage synthesis algorithm and turn-to-turn protection method and device
  • Longitudinal zero-sequence voltage synthesis algorithm and turn-to-turn protection method and device
  • Longitudinal zero-sequence voltage synthesis algorithm and turn-to-turn protection method and device

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Experimental program
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Effect test

Embodiment 1

[0063] A longitudinal zero sequence voltage synthesis algorithm and inter-turn protection method, including:

[0064] Obtain terminal zero sequence voltage and neutral zero sequence voltage;

[0065] The longitudinal zero-sequence voltage is calculated by vector synthesis from the zero-sequence voltage of the machine terminal and the zero-sequence voltage of the neutral point;

[0066] Based on the longitudinal zero sequence voltage, the protection calculation is performed according to the inter-turn protection action equation;

[0067] According to the result of the protection calculation, the protection action execution mechanism is controlled to execute the protection action.

Embodiment 2

[0069] In some embodiments, the zero sequence voltage at the machine terminal includes the fundamental zero sequence voltage at the machine terminal 3U0 T , The neutral point zero sequence voltage includes the neutral point fundamental zero sequence voltage 3U0 N , The longitudinal zero sequence voltage includes the fundamental longitudinal zero sequence voltage 3U0 Z .

[0070] The longitudinal zero-sequence voltage synthesis algorithm and the inter-turn protection method, the longitudinal zero-sequence voltage is calculated by vector synthesis from the zero-sequence voltage at the machine terminal and the zero-sequence voltage at the neutral point, including:

[0071] K is the conversion factor.

[0072] The action equation of the inter-turn protection is:

[0073] 3U0 Z >3U0 h

[0074] Among them, 3U0 h Set value for the fundamental zero sequence voltage of the sub-sensitive section.

Embodiment 3

[0076] In some other embodiments, the terminal zero sequence voltage includes the terminal fundamental zero sequence voltage 3U0 T And terminal third harmonic zero sequence voltage 3U0 T3ω , The neutral point zero sequence voltage includes the neutral point fundamental zero sequence voltage 3U0 N And neutral point third harmonic zero sequence voltage 3U0 N3ω , The longitudinal zero sequence voltage includes the fundamental longitudinal zero sequence voltage 3U0 Z And third harmonic longitudinal zero sequence voltage 3U0 Z3ω .

[0077] The longitudinal zero-sequence voltage is calculated from the zero-sequence voltage at the machine terminal and the zero-sequence voltage at the neutral point through vector synthesis, including:

[0078] K is the conversion factor;

[0079] K 3ω Is the conversion factor.

[0080] The action equation of the inter-turn protection is:

[0081]

[0082] Among them, 3U0 l Set value for the fundamental zero sequence voltage of the sensitive section, 3U0 Z...

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Abstract

The invention discloses a longitudinal zero-sequence voltage synthesis algorithm and a turn-to-turn protection method and device. The method comprises the following steps: acquiring a machine end zero-sequence voltage and a neutral point zero-sequence voltage; obtaining a longitudinal zero-sequence voltage through vector synthesis calculation of the zero-sequence voltage of the machine end and thezero-sequence voltage of the neutral point; performing protection calculation according to an inter-turn protection action equation based on the longitudinal zero-sequence voltage; and controlling aprotection action execution mechanism to execute the protection action according to a protection calculation result. When a special voltage transformer is not arranged at the generator end, the turn-to-turn protection of the generator stator winding can be realized by using the method provided by the invention.

Description

Technical field [0001] The invention relates to the technical field of longitudinal zero-sequence voltage inter-turn protection of generators, in particular to a longitudinal zero-sequence voltage synthesis algorithm and inter-turn protection method and device. Background technique [0002] Longitudinal zero-sequence voltage inter-turn protection, as one of the main protections of large generator sets, has an important position. The turbine unit with branching neutral point is generally installed with lateral difference protection or split-phase lateral difference protection, which can reflect the inter-turn fault of the generator stator winding; the turbine unit does not have conditions to install lateral difference, split-phase lateral difference and other protection, and can only use special voltage Transformer (TV) to achieve longitudinal zero-sequence voltage inter-turn protection, that is, a special fully insulated voltage transformer is installed at the outlet of the gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/06
CPCH02H7/06H02H1/0007
Inventor 刘小波丁俊健
Owner NANJING GUODIAN NANZI WEIMEIDE AUTOMATION CO LTD
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