Unlock instant, AI-driven research and patent intelligence for your innovation.
Brushless exciter excitation winding turn-to-turn short circuit fault on-line detection device and method
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
An inter-turn short-circuit fault and excitation winding technology, which is applied in the field of power systems, can solve the problems of special protection, weak protection, and imperfect protection principle for inter-turn short-circuit faults of non-stator excitation windings. Online detection, high sensitivity effect
Active Publication Date: 2021-06-18
NR ELECTRIC CO LTD +1
View PDF2 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
In the prior art, only a simple stator excitation overcurrent protection is configured, but no special protection is configured for the stator excitation winding turn-to-turn short circuit fault
In addition, due to the imperfect protection principle, GB / T14285-2006, DL / T684-2012 and other relevant standards and standards have not put forward clear requirements for the internal fault protection of the excitation winding of the brushless exciter. Failsafe has been in a "weak protection" state
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0052] Based on the above-mentioned device, the present invention also provides a first embodiment of an online detection method for an inter-turn short-circuit fault of the excitation winding of a brushless exciter, which includes the following steps:
[0053] S110: collect the excitation winding current of the exciter, and calculate its DC component I DC and a specific fractional harmonic total I Σ ; The specific fractional harmonics are: j×m / P harmonic components, where j=1, 2, ..., N, N is a natural number, m is the phase number of the armature winding of the exciter, and P is the excitation motor The number of pole pairs on the pivot side.
[0054] S120: Calculate I Σ with I DC The ratio of K Σ .
[0055] S130: When I DC and K Σ When both are greater than their respective thresholds, it is judged as an inter-turn short circuit fault of the excitation winding.
Embodiment 2
[0056] Embodiment 2 of an on-line detection method for inter-turn short circuit fault of a brushless exciter excitation winding of the present invention includes the following steps:
[0057] S210: Collect the excitation winding current of the exciter and calculate its DC component I DC and a specific fractional harmonic total I Σ ; The specific fractional harmonics are: j×m / P harmonic components, where j=1, 2, ..., N, N is a natural number, m is the phase number of the armature winding of the exciter, and P is the excitation motor The number of pole pairs on the pivot side. where the specific fractional harmonic total I Σ The calculation formula is:
[0058] I Σ =F(I j );
[0059] Among them, I j is the effective value of the j×m / P harmonic component in the excitation winding current of the exciter, j=1, 2,..., N, N is a natural number, m is the phase number of the armature winding of the exciter, and P is the rotor pole of the armature side of the exciter logarithm, ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention discloses a brushless exciter excitation winding turn-to-turn short circuit fault on-line detection method, which comprises the following steps of: detecting the current of a brushless exciter excitation winding, and calculating a direct current component IDC and a specific fractional harmonic total amount I [sigma]; calculating a ratio K [sigma] of the I [sigma] to the IDC; and when the IDC and the K [sigma] are greater than respective threshold values at the same time, reporting a turn-to-turn short circuit fault signal of the excitation winding in a delayed manner. The invention further discloses a brushless exciter excitation winding turn-to-turn short circuit fault on-line detection device. The device and the method are used for realizing on-line detection of the turn-to-turn short circuit fault of the excitation winding of the brushless exciter.
Description
technical field [0001] The invention belongs to the field of power systems, and in particular relates to an on-line detection device and method for an inter-turn short-circuit fault of an exciting winding of a brushless exciter. Background technique [0002] As the important auxiliary equipment of the generator set, the brushless exciter will seriously endanger the safe operation of the generator set when the stator excitation winding faults between turns, so it is necessary to alarm or trip in time for such faults. In the prior art, only a simple stator excitation overcurrent protection is configured, but no special protection is configured for the inter-turn short circuit fault of the stator excitation winding. In addition, due to the imperfect protection principle, GB / T14285-2006, DL / T684-2012 and other relevant standards and standards have not put forward clear requirements for the internal fault protection of the excitation winding of the brushless exciter. The fail-sa...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More