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

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.

Claims

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.sub.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.sub.CT; and said compare module performs online monitoring of the running state of said series spark gap divider return circuit by comparing said U.sub.divide voltage with said U.sub.CT; wherein said compare module includes two operating amplifier U3A and U3B, and two comparator U4A and U4B; said U3A makes difference between U.sub.divide voltage and U.sub.CT; said U4A compares the output of said U3B with said U.sub.divide voltage, and output the comparison data; and said U4B compares the output of said U3A with said U.sub.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 C1,C2,C3 and C4; said sampling voltage input module includes the two state amplifying circuit U1B and U2B, and the effective value conversion chip A; wherein said U1B and U2B amplify and adjust the two ends of said capacitor C, said effective value conversion chip A converts said amplified and adjusted signal into U.sub.divide voltage.

4. The online monitoring circuit according to claim 1, wherein said series compensation current input module includes one state operating amplifier circuit U2A and the effective value conversion chip B; said U2A 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.sub.CT.

5. The online monitoring circuit according to claim 1, wherein said U4A and said U4B comprise the gate structure of an OC, the output ends connect each other; when it is satisfying the condition a.Math.U.sub.CTU.sub.divide voltageb.Math.U.sub.CT, said divider return circuit running fine, the output end connecting to said U4A and said U4B outputs high level; when it is satisfying the condition U.sub.divide voltage<a.Math.U.sub.CT or U.sub.divide voltage>b.Math.U.sub.CT, the output end connecting to said U4A and said U4B outputs a low level warning, and wherein, said a and b is the preset error coefficient, ab.

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 U4A and U4B.

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 S1, the voltage equalization link series capacitor C obtains the current signal of the series capacitor using a serial current transformer; step S2, 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.sub.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.sub.CT; and step S3, said compare module performs online monitoring of the running state of said series spark gap divider return circuit by comparing said U.sub.divide voltage with said U.sub.CT.

8. The online monitoring circuit according to claim 7, wherein said sampling voltage input module includes two state amplifying circuit U1B and U2B, 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.sub.divide voltage, in particular to said U1B and U2B amplify and adjust the two ends of said capacitor C, said effective value conversion chip A converts said amplified and adjusted signal into U.sub.divide voltage.

9. The online monitoring circuit according to claim 7, wherein said series compensation current input module includes one state operating amplifier circuit U2A 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.sub.CT, in particular to said U2A 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.sub.CT.

10. The online monitoring circuit according to claim 7, wherein said compare module includes two operating amplifier U3A and U3B, and two comparator U4A and U4B; in said step S3, said compare module realizes online monitoring the running state of said series spark gap divider return circuit though comparing said U.sub.divide voltage with said U.sub.CT, including; step S301, said U3A makes difference between U.sub.divide voltage and U.sub.CT, said U3B makes reverse on said U.sub.divide voltage; step S302, said U4A compares the output of said U.sub.divide voltage with said U3B, and then outputs them; said U4B compares the output of said U.sub.divide voltage with said U3A, and then outputs them; the output ends of said U4A and U4B connect each other; step S303, When it is satisfying the condition a.Math.U.sub.CTU.sub.divide voltageb.Math.U.sub.CT, said divider return circuit running is fine, the output end connecting to said U4A and said U4B outputs high level; when satisfying the condition U.sub.divide voltage<a.Math.U.sub.CT or U.sub.divide voltage>b.Math.U.sub.CT, said divider return circuit running is exception, the output end connecting to said U4A and said U4B outputs low level warning; wherein, said a and b is the preset error coefficient, ab.

11. The online monitoring circuit according to claim 7, wherein said U4A and said U4B 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 U4A and U4B.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a structure diagram of an online monitoring circuit of the series compensation spark gap divider return circuit the present invention provided;

(2) FIG. 2 is a working principle diagram of an online monitoring circuit of the series compensation spark gap divider return circuit the present invention provided;

(3) FIG. 3 is a circuit diagram of an online monitoring circuit of the series compensation spark gap divider return circuit the present invention provided;

(4) FIG. 4 is a method flow chart of an online monitoring circuit of the series compensation spark gap divider return circuit the present invention provided;

(5) FIG. 5 is a method flow chart of realizing online monitoring circuit of the series compensation spark gap divider return circuit by the compare module the present invention provided.

DETAILED DESCRIPTION OF EMBODIMENTS

(6) The series compensation device includes the parallel series capacitor, the spark gap and the series spark gap divider return circuit. The present invention provides an online monitoring circuit of the series compensation spark gap divider return circuit, said divider return circuit sets the voltage equalization link and the voltage sampling link, wherein the voltage equalization link is the series capacitor C1, C2, C3 and C4, the voltage sampling link is the capacitor C, the capacitor C series the voltage equalization link, that is a series of C1, C2, C3 and C4.

(7) The specific structure diagram of the online monitoring circuit of the series compensation spark gap divider return circuit this present invention provided is as shown in FIG. 1. FIG. 1 shows, said monitoring circuit includes voltage sampling input module, series compensation current input module and the compare module, wherein the voltage of the voltage sampling input module is inputted from capacitor C two ends, and after amplifying it converses it into direct voltage signal U.sub.divide voltage, and then outputs them, at the same time the current signal of the series compensation current input module is inputted from the series capacitor and it converses it into direct voltage signal U.sub.CT after amplifying it. The compare module through comparing the inputted U.sub.divide voltage with U.sub.CT achieves the online monitoring the running state of the divider return circuit.

(8) FIG. 2 is a working principle diagram of the online monitoring circuit of the series compensation spark gap divider return circuit this present invention provided, as shown in FIG. 2, wherein that, the series compensation current input module of the online monitoring circuit gets the series capacitor current signal through serial-in a measurement CT in the current transformer secondary circuit being used to get energy.

(9) FIG. 3 is a circuit diagram of the online monitoring circuit of the series compensation spark gap divider return circuit this present invention provided, as FIG. 3 shown, the voltage sampling input module includes the two state amplifying circuit U1B and U2B, and the effective value conversion chip A, wherein U1B and U2B amplify and adjust the two ends of said capacitor C, the effective value conversion chip A converses the signal after amplifying and adjusting into U.sub.divide voltage The series compensation current input module includes one state operation amplifying circuit U2A and the effective value conversion chip B; U2A amplifies and adjusts the current signal of the series capacitor into voltage signal, the effective value conversion chip B converses the signal after amplifying and adjusting into direct current voltage signal U.sub.CT.

(10) The compare module includes two operation amplifier U3A and U3B, and two comparator U4A and U4B;

(11) U3A makes difference between direct current voltage signal U.sub.divide voltage and U.sub.CT, U3B makes reverse on said direct current voltage sign U.sub.divide voltage. U4A compares the output of said U.sub.divide voltage with said U3B, and then outputs them, at the same time U4B compares the output of said U.sub.divide voltage with said U3A, and then outputs them, the output end of U4A and U4B connect to each other, wherein, U4A and U4B is the gate structure of the OC, so that, U4A and U4B connected the outputs can realize the function of AND gate.

(12) When satisfying the condition a.Math.U.sub.CTU.sub.divide voltageb.Math.U.sub.CT, said divider return circuit running fine, the output end connecting to said U4A and said U4B outputs high level;

(13) When satisfying the condition U.sub.divide voltage<a.Math.U.sub.CT or U.sub.divide voltage>b.Math.U.sub.CT, said divider return circuit running is exception, the output end connecting to said U4A and said U4B outputs low level warning.

(14) Wherein, said a and b is the preset error coefficient, ab, and the size of said error coefficient a and b can be achieved through adjusting the resistance value of said comparator U4A and U4B.

(15) FIG. 4 is a method flow chart of an online monitoring circuit of the series compensation spark gap divider return circuit the present invention provided; as FIG. 4 shows, the method includes the following steps:

(16) Step S1, the voltage equalization link series capacitor C, gets the current signal of the series capacitor through serial-in a measurement CT in the current transformer secondary circuit;

(17) Step S2, the sampling voltage input module amplifies the voltage of the two ends of the series capacitor C and converts it into direct current signal U.sub.divide voltage, the series compensation current input module amplifies the direct current signal of the series capacitor converts it into direct voltage signal U.sub.CT.

(18) Wherein, the voltage sampling input module includes the two state amplifying circuit U1B and U2B, and the effective value conversion chip A. The series compensation current input module includes one state operation amplifying circuit U2A and the effective value conversion chip B.

(19) Specifically, the sampling voltage input module amplifies the voltage of the two ends of the series capacitor C, and converts into direct current voltage signal U.sub.divide voltage in particular to said U1B and U2B amplify and adjust the two ends of said capacitor C, said effective value conversion chip A converts said amplified and adjusted signal into U.sub.divide voltage.

(20) The series compensation current input module after amplifies the current signal of the series capacitor converts, and into it direct current voltage signal U.sub.CT, in particular to U2A amplifies and adjusts the current signal of the series capacitor into voltage signal, the effective value conversion chip B converses the signal after amplifying and adjusting into U.sub.CT.

(21) Step S3, The compare module through comparing the inputted U.sub.divide voltage with U.sub.CT achieves the online monitoring the running state of the divider return circuit.

(22) Where the compare module includes two operation amplifier U3A and U3B, and two comparator U4A and U4B;

(23) Specifically, the method of the compare module through comparing the inputted U.sub.divide voltage and U.sub.CT achieves the online monitoring the running state of the divider return circuit is shown in FIG. 5, as FIG. 5 shows, the method includes the following steps:

(24) Step S301, U3A makes difference between U.sub.divide voltage and U.sub.CT, said U3B makes reverse on said U.sub.divide voltage.

(25) Step S302, U4A compares the output of U.sub.divide voltage with U3B, and outputs them, U4B compares the output of U.sub.divide voltage with U3A, and then outputs them, the output end of U4A and U4B connect to each other;

(26) Step S303, when satisfying the condition a.Math.U.sub.CTU.sub.divide voltage<b.Math.U.sub.CT, said divider return circuit running fine, the output end connecting to said U4A and said U4B outputs high level; When satisfying the condition U.sub.divide voltage<a.Math.U.sub.CT or U.sub.divide voltage>b.Math.U.sub.CT, said divider return circuit running is exception, the output end connecting to said U4A and said U4B outputs low level warning.

(27) Wherein, said a and b is the preset error coefficient, ab, and the size of said error coefficient a and b can be achieved through adjusting the resistance value of said comparator U4A and U4B.

(28) U4A and U4B is the gate structure of the OC, so that, U4A and U4B connected the outputs can realize the function of AND gate.

(29) At last, in this description of the embodiment, we have detail describe the present invention according to a particular example. The detail embodiment is one example of the invention but not the only one, so the person in this field must be understand that all the alternatives and other equal and/or similar examples are all within the range of the invention and they are all consistent with the spirits of this invention, are all protected by our claims.