A method for preventing malfunction of disconnection of voltage transformer for overvoltage protection
A voltage transformer and protection voltage technology, which is applied in the design field of power system relay protection, can solve the problems of overvoltage protection malfunction, lack of voltage transformer disconnection blocking criterion, and large calculated voltage, so as to prevent overvoltage The effect of protection against malfunction
Active Publication Date: 2019-07-23
NR ELECTRIC CO LTD +1
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] When any phase of two sets of voltage transformers is disconnected for the second time, the calculated voltage will be very large, usually greater than the overvoltage setting value of the protected equipment. Line blocking criterion, resulting in misoperation of overvoltage protection
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0024] like figure 1 As shown, an overvoltage protection voltage transformer disconnection anti-maloperation method includes the following steps:
[0025] Step 1. Collect the voltage at both ends of the protected equipment;
[0026] Specifically: if figure 2 As shown, use the voltage transformers (PT1 and PT2) located at both ends of the protected equipment to collect the voltages at both ends of the protected equipment respectively.
[0027] Step 2. Calculate the voltage differen...
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 an overvoltage protection voltage transformer disconnection maloperation prevention method. The method includes collecting the voltages at the two ends of a protected device; calculating the voltage difference of the two ends of the protected device; judging the disconnection of a voltage transformer according to the set criterion; and instantaneously blocking the overvoltage protection when it is determined that the voltage transformer is disconnected. The method determines whether or not the voltage transformer is disconnected by judging the fundamental wave effective value of the voltage difference of the two ends of the protected device, thereby effectively preventing the overvoltage protection malfunction caused by the disconnection of the voltage transformer, enhancing the blocking capability of the over-voltage protection in the voltage transformer disconnection, preventing the over-voltage protection malfunction caused by the voltage transformer disconnection.
Description
technical field [0001] The invention belongs to the field of design methods for relay protection of electric power systems, and in particular relates to a method for preventing a malfunction of a disconnection of an overvoltage protection voltage transformer. Background technique [0002] In the existing power system, part of the primary equipment is connected in series, and both ends of the equipment are connected to the same voltage level, such as figure 1 shown. The voltage at both ends of the equipment needs to be installed with two sets of voltage transformers, and the difference is obtained after measuring the voltage respectively. [0003] When any phase of two sets of voltage transformers is disconnected for the second time, the calculated voltage will be very large, usually greater than the overvoltage setting value of the protected equipment. Line blocking criterion, resulting in misoperation of overvoltage protection. [0004] Therefore, a fast voltage transfor...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20H02H3/28H02H1/00G01R35/02G01R31/02
CPCG01R31/50G01R35/02H02H1/0007H02H3/20H02H3/28
Inventor 张晓宇顾乔根郑超文继锋莫品豪
Owner NR ELECTRIC CO LTD