Online monitoring circuit and method of the series compensation spark gap divider return circuit

Patent metadata

Field	Value
Publication number	US-10107838-B2
Application number	US-201314399904-A
Country	US
Kind code	B2
Filing date	May 2, 2013
Priority date	May 7, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

The present invention provides an online monitoring circuit of the series compensation spark gap divider return circuit. Said series compensation spark gap divider return circuit includes a voltage equalization link and a voltage sampling link. Said voltage link includes the capacitor C which series said voltage equalization link. Said online monitoring circuit includes the voltage sampling input module, series compensation current input module and the compare module. Said sampling voltage input module after amplified the voltage of the two ends of the series capacitor C converts it into direct current signal.

First claim

What is claimed is:

1. An online monitoring circuit of the series compensation spark gap divider return circuit, is characterized that, said series compensation spark gap divider return circuit includes a voltage equalization link and a voltage sampling link; said voltage sampling link includes a capacitor C;
said online monitoring circuit includes a voltage sampling input module, a series compensation current input module and a compare module;
said sampling voltage input module amplifies the voltage of the two ends of the series capacitor C, and converts it into direct current signal U divide voltage ;
said series compensation current input module amplifies the current signal of said series capacitor, and converts it into direct current voltage signal U CT ; and
said compare module performs online monitoring of the running state of said series spark gap divider return circuit by comparing said U divide voltage with said U CT ;
wherein said compare module includes two operating amplifier U 3 A and U 3 B, and two comparator U 4 A and U 4 B;
said U 3 A makes difference between U divide voltage and U CT ;
said U 4 A compares the output of said U 3 B with said U divide voltage , and output the comparison data; and
said U 4 B compares the output of said U 3 A with said U divide voltage , and output the comparison data.

2. The online monitoring circuit according to claim 1 , wherein said series compensation current input module of the online monitoring circuit obtains the series capacitor current signal through a current transformer secondary circuit.

3. The online monitoring circuit according to claim 1 , wherein said voltage equalization link includes series capacitor C 1 ,C 2 ,C 3 and C 4 ; said sampling voltage input module includes the two state amplifying circuit U 1 B and U 2 B, and the effective value conversion chip A;
wherein said U 1 B and U 2 B amplify and adjust the two ends of said capacitor C, said effective value conversion chip A converts said amplified and adjusted signal into U divide voltage .

4. The online monitoring circuit according to claim 1 , wherein said series compensation current input module includes one state operating amplifier circuit U 2 A and the effective value conversion chip B; said U 2 A amplifies and adjusts the current signal of the series capacitor into voltage signal, said effective value chip B converses the amplified and adjusted signal into U CT .

5. The online monitoring circuit according to claim 1 , wherein said U 4 A and said U 4 B comprise the gate structure of an OC, the output ends connect each other;
when it is satisfying the condition a·U CT ≤U divide voltage ≤b·U CT , said divider return circuit running fine, the output end connecting to said U 4 A and said U 4 B outputs high level;
when it is satisfying the condition U divide voltage <a·U CT or U divide voltage >b·U CT , the output end connecting to said U 4 A and said U 4 B outputs a low level warning, and
wherein, said a and b is the preset error coefficient, a≤b.

6. The online monitoring circuit according to claim 5 , wherein the size of said error coefficients a and b can be achieved through adjusting the resistance value of said comparator U 4 A and U 4 B.

7. The online monitoring method of the series compensation spark gap divider return circuit, including any online monitoring circuit according to claim 6 , wherein said method includes:
step S 1 , the voltage equalization link series capacitor C obtains the current signal of the series capacitor using a serial current transformer;
step S 2 , said sampling voltage input module amplifies the voltage of the two ends of the series capacitor C, and converts it into direct current signal U divide voltage , said series compensation current input module amplifies the current signal of said series capacitor, and converts it into direct current voltage signal U CT ; and
step S 3 , said compare module performs online monitoring of the running state of said series spark gap divider return circuit by comparing said U divide voltage with said U CT .

8. The online monitoring circuit according to claim 7 , wherein
said sampling voltage input module includes two state amplifying circuit U 1 B and U 2 B, and the effective value conversion chip A;
in step 2 , the sampling voltage input module amplifies the voltage of the two ends of said capacitor C, and converts it into direct current signal U divide voltage , in particular to said U 1 B and U 2 B amplify and adjust the two ends of said capacitor C, said effective value conversion chip A converts said amplified and adjusted signal into U divide voltage .

9. The online monitoring circuit according to claim 7 , wherein
said series compensation current input module includes one state operating amplifier circuit U 2 A and an effective value conversion chip B;
in step 2 , the series compensation current input module amplifies the current signal of said series capacitor, and converts it into direct current voltage signal U CT , in particular to said U 2 A amplifies and adjusts the current signal of the series capacitor into voltage signal, said effective value conversion chip B converses the amplified and adjusted signal into U CT .

10. The online monitoring circuit according to claim 7 , wherein
said compare module includes two operating amplifier U 3 A and U 3 B, and two comparator U 4 A and U 4 B;
in said step S 3 , said compare module realizes online monitoring the running state of said series spark gap divider return circuit though comparing said U divide voltage with said U CT , including;
step S 301 , said U 3 A makes difference between U divide voltage and U CT , said U 3 B makes reverse on said U divide voltage ;
step S 302 , said U 4 A compares the output of said U divide voltage with said U 3 B, and then outputs them; said U 4 B compares the output of said U divide voltage with said U 3 A, and then outputs them; the output ends of said U 4 A and U 4 B connect each other;
step S 303 , When it is satisfying the condition a·U CT ≤U divide voltage ≤b·U CT , said divider return circuit running is fine, the output end connecting to said U 4 A and said U 4 B outputs high level;
when satisfying the condition U divide voltage <a·U CT or U divide voltage >b·U CT , said divider return circuit running is exception, the output end connecting to said U 4 A and said U 4 B outputs low level warning;
wherein, said a and b is the preset error coefficient, a≤b.

11. The online monitoring circuit according to claim 7 , wherein said U 4 A and said U 4 B comprise the gate structure of the OC, the size of said error coefficients a and b can be achieved through adjusting the resistance value of said comparator U 4 A and U 4 B.

Assignees

• State Grid Corp China
• China Electric Power Res Inst
• State Grid Coop Of China

Inventors

• Li Guofu
• Yu Hui
• Li Zhiyuan
• Li Yongliang

Classifications

• G01R19/0084 Primary

  Measuring voltage only · CPC title

• H02H3/205

  using a spark-gap as detector · CPC title

• G01R1/30

  Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier · CPC title

• F02P2017/121

  by measuring spark voltage · CPC title

• H01T15/00

  Circuits specially adapted for spark gaps, e.g. ignition circuits (ignition circuits for internal-combustion engines F02P; electric spark ignition for combustion apparatus F23Q; protection circuits using spark gaps H02H9/06) · CPC title