CN103499729A - Measurement method of voltage division ratio of voltage-sharing capacitor for spark gap of series capacitor compensation device - Google Patents
Measurement method of voltage division ratio of voltage-sharing capacitor for spark gap of series capacitor compensation device Download PDFInfo
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Abstract
The invention relates to the technical field related to a series capacitor compensation device, in particular to a measurement method of the voltage division ratio of a voltage-sharing capacitor for a spark gap of the series capacitor compensation device. The method comprises the steps of disconnecting the electrical connection between a first capacitor branch circuit and a low-voltage end and/ or disconnecting the electrical connection between a second capacitor branch circuit and a high-voltage end; respectively applying the same test voltage at the two ends of the first capacitor branch circuit and the second capacitor branch circuit, and controlling the frequency of the test voltage to be more than or equal to 50Hz; measuring the current of the first capacitor branch circuit to obtain first capacitor branch circuit current, and measuring the current of the second capacitor branch circuit to obtain the second capacitor branch circuit current; taking the inverse ratio of the current ratio of the first capacitor branch circuit current and the second capacitor branch circuit current as the voltage division ratio of the first capacitor branch circuit and the second capacitor branch circuit. After the method capable of improving the test frequency is adopted, the test voltage can be reduced to be lower than the safe voltage of 50V under the condition of meeting the requirements of test current, so that the test safety is improved, and the measurement method has very high power frequency interference resistance.
Description
Technical field
The present invention relates to the compensator with series capaci tance correlative technology field, particularly the measuring method of equalizing capacitance intrinsic standoff ratio for a kind of compensator with series capaci tance sparking distance.
Background technology
Serial connection capacitor compensating device can improve system transmission line capability and stability, and its principle of work is shown in accompanying drawing 1, and wherein, GAP is sparking distance, and D is damping circuit.Sparking distance is the pass key protection equipment of series capacitor.Voltage limiter (MOV) is the main protection of series capacitor, i.e. MOV1 in Fig. 1 and MOV2, and sparking distance is the main protection of MOV and the back-up protection of series capacitor.When serious short trouble occurs in system, the rapid overvoltage of capacitor, MOV protects startup, and because the energy of MOV bears limitedly, sparking distance should be at the Millisecond starting protection, and the sparking distance fault can cause the serial connection capacitor compensating device main equipment to damage.The electric pressure of compensator with series capaci tance is more and more higher, often adopts the work of many gap series, utilizes equalizing capacitance (C1, C2, C3 and C4) by the trigger voltage equalization, sees accompanying drawing 2.Equalizing capacitance has the characteristics such as electric pressure high (as single electric capacity before sparking distance triggers reaches 67.5kV), electric capacity little (as single electric capacity 3000pF), be arranged on the bottom of sparking distance, see shown in accompanying drawing 3, the height of sparking distance itself reaches 10m, and is arranged on the series compensation platform of the about 10m in ground.In order to ensure the sparking distance reliably working, the ratio that requires the terminal voltage of C1, C2 to account for total voltage is the ratio that 1/4, C1 and C2 series connection, C3 and C4 series connection terminal voltage account for total voltage and is 1/2.On engineering, usually require C1, C2, C3 and C4 to equate, adopt power frequency voltammetry and bridge method testing capacitor value, but the calculating partial pressure ratio, and General Requirements is in 5%.
Based on above principle, the capacitance by the test equalizing capacitance, can obtain intrinsic standoff ratio.But because electric capacity is little, when equipment acceptance and maintenance, need higher power-frequency voltage source apply voltage to capacitor, otherwise in the situation that setting high test job, the equipment installation position there is unsafe factor in test current signals very weak (as the electric current recorded while applying 220V approximately 200 μ A).Particularly string benefit device closes on high-tension line in transformer station, and the series compensation platform that sparking distance is installed is subject to line-frequency induction stronger, and the test current signal easily is disturbed.To press testing capacitor calculating partial pressure ratio, have twice test error of voltage and current, in order averaging, at least to need to test tens times, measuring accuracy and efficiency are poor.
Summary of the invention
Based on this, be necessary for prior art, the compensator with series capaci tance sparking distance to be existed with the measurement of equalizing capacitance intrinsic standoff ratio that measuring accuracy is low, test process is complicated and inefficient technical matters, the measuring method of a kind of compensator with series capaci tance sparking distance with the equalizing capacitance intrinsic standoff ratio is provided.
The measuring method of equalizing capacitance intrinsic standoff ratio for a kind of compensator with series capaci tance sparking distance, described serial connection capacitor compensating device comprises at least two sparking distance branch roads and at least two capacitive branch, each sparking distance branch road comprises at least one sparking distance, each capacitive branch comprises at least one electric capacity, wherein the first sparking distance branch road and the first capacitive branch formation the first spark capacitive branch in parallel, the second sparking distance branch road and the second capacitive branch formation the second spark capacitive branch in parallel, one end of the first spark capacitive branch is low pressure end, the other end of the first spark capacitive branch is connected with an end of the second spark capacitive branch, the other end of the second spark capacitive branch is high-pressure side, described measuring method comprises:
Disconnect the electrical connection of the first capacitive branch and low pressure end and/or disconnect the electrical connection of the second capacitive branch and high-pressure side;
At the first capacitive branch and the second capacitive branch two ends, apply respectively identical test voltage, and the frequency of described test voltage is more than or equal to 500 hertz;
The electric current of measuring the first capacitive branch obtains the first capacitive branch electric current, and the electric current of measuring the second capacitive branch obtains the second capacitive branch electric current;
Using the inverse ratio of current ratio of the first capacitive branch electric current and the second capacitive branch electric current as the intrinsic standoff ratio of the first capacitive branch and the second capacitive branch.
Further, described the first sparking distance branch road comprises the first sealing sparking distance, and described the second sparking distance branch road comprises the second sealing sparking distance, and described the first capacitive branch comprises the first electric capacity, and described the second capacitive branch comprises the second electric capacity.
Further, adopt current testing device to measure described the first capacitive branch electric current and the second capacitive branch electric current.
Preferably, described current testing device is the testing current instrument, and the frequency of described test voltage is for being more than or equal to 500 hertz and be less than or equal to 1500 hertz.
Further, described the first sparking distance branch road comprises the first main sparking distance, described the second sparking distance branch road comprises the second main sparking distance, and described the first capacitive branch comprises the first electric capacity and the second electric capacity, and described the second capacitive branch comprises the 3rd electric capacity and the 4th electric capacity.
Further, described serial connection capacitor compensating device also comprises the first sealing sparking distance branch road and the second sealing sparking distance branch road, described the first sealing sparking distance branch road comprises the first sealing sparking distance, described the second sealing sparking distance branch road comprises the second sealing sparking distance, described the first electric capacity and described the first sealing sparking distance branch circuit parallel connection form the first electric capacity sealing sparking distance branch road, and described the second electric capacity and described the second sealing sparking distance branch circuit parallel connection form the second electric capacity sealing sparking distance branch road, the first electric capacity sealing sparking distance branch road is connected with the second electric capacity sealing sparking distance branch road.
Further, also comprise:
At the first electric capacity and the second electric capacity two ends, apply respectively identical test voltage;
The electric current of measuring the first electric capacity obtains the first capacitance current, and the electric current of measuring the second electric capacity obtains the second capacitance current;
Using the inverse ratio of current ratio of the first capacitance current and the second capacitance current as the intrinsic standoff ratio of the first electric capacity and the second electric capacity.
Further, adopt current testing device to measure described the first capacitance current and the second capacitance current.
Preferably, described current testing device is the testing current instrument, and the frequency of described test voltage is for being more than or equal to 500 hertz and be less than or equal to 1500 hertz.
Further, described test voltage is less than or equal to 50 volts.
The present invention improves the method for test frequency by employing, meet under the measuring current requirement condition and test voltage can be down to below safe voltage 50V, has improved Security of test, has extremely strong anti-power frequency interference performance.
Simultaneously, due to the capacity ratio of the current ratio replacement series circuit that adopts the test parallel circuit, offset inductive impact and the common-mode signal impact of p-wire, improved measuring accuracy, at least reduced half testing time.
Measuring method of the present invention has reduced test voltage, has simplified testing procedure, has reduced test danger, has improved measuring accuracy.
The accompanying drawing explanation
The fundamental diagram that Fig. 1 is serial connection capacitor compensating device;
Fig. 2 is many gap series of serial connection capacitor compensating device fundamental diagram, and wherein M1, M2 are main gap, and T1, T2 are seal clearance, C1, C2, C3, C4 are dividing potential drop electric capacity, R1, R2 are resistance, and A1 is pulse transformer, and B1 is that high-pressure side pulse transformer, G1 are for triggering loop;
Fig. 3 is sparking distance and even electric capacity scheme of installation thereof;
Fig. 4 is the workflow diagram of a kind of compensator with series capaci tance sparking distance of the present invention by the measuring method of equalizing capacitance intrinsic standoff ratio;
The schematic diagram that Fig. 5 is measuring method of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Be illustrated in figure 4 the workflow diagram of a kind of compensator with series capaci tance sparking distance of the present invention by the measuring method of equalizing capacitance intrinsic standoff ratio, described serial connection capacitor compensating device comprises at least two sparking distance branch roads and at least two capacitive branch, each sparking distance branch road comprises at least one sparking distance, each capacitive branch comprises at least one electric capacity, wherein the first sparking distance branch road and the first capacitive branch formation the first spark capacitive branch in parallel, the second sparking distance branch road and the second capacitive branch formation the second spark capacitive branch in parallel, one end of the first spark capacitive branch is low pressure end, the other end of the first spark capacitive branch is connected with an end of the second spark capacitive branch, the other end of the second spark capacitive branch is high-pressure side, measuring method comprises:
Step S101, disconnect the electrical connection of the first capacitive branch and low pressure end and/or disconnect the electrical connection of the second capacitive branch and high-pressure side;
Step S102, at the first capacitive branch and the second capacitive branch two ends, apply respectively identical test voltage, and the frequency of described test voltage is more than or equal to 500 hertz;
Step S103, the electric current of measuring the first capacitive branch obtains the first capacitive branch electric current, and the electric current of measuring the second capacitive branch obtains the second capacitive branch electric current;
Step S104, using the inverse ratio of current ratio of the first capacitive branch electric current and the second capacitive branch electric current as the intrinsic standoff ratio of the first capacitive branch and the second capacitive branch.
According to the circuit ultimate principle, the capacitive reactance of electric capacity and the inversely proportional relation of its frequency, under same measuring current, after improving frequency, be applied to the inversely proportional decline of voltage at electric capacity two ends according to Ohm law; Apply same voltage on the electric capacity of two series connection, the electric current passed through is identical, the voltage at electric capacity two ends and its capacitance are inversely proportional, and apply same voltage between the electric capacity of two parallel connections, the electric current passed through and the capacitance of this branch road are in direct ratio, the intrinsic standoff ratio of two series capacitances and the inversely proportional relation of current ratio changed into after in parallel.
The present embodiment, after execution step S101 and step S102, the first capacitive branch and the second capacitive branch become parallel form, and circuit theory diagrams are as shown in Figure 5.The equivalent capacity of the equivalent capacity of the first capacitive branch and the second capacitive branch is considered as respectively to CA, CB, apply high frequency voltage source to the first capacitive branch two ends and the second capacitive branch two ends simultaneously, acquisition stream is crossed electric current I 1, the I2 of the first capacitive branch and the second capacitive branch simultaneously, and the inverse ratio that calculates the ratio of I1 and I2 can obtain the intrinsic standoff ratio between equalizing capacitance C1 and C2.
Wherein, in step S101, disconnect the electrical connection of the first capacitive branch and low pressure end and/or disconnect the electrical connection of the second capacitive branch and high-pressure side, due to the first sparking distance branch road and the first capacitive branch formation the first spark capacitive branch in parallel, the second sparking distance branch road and the second capacitive branch formation the second spark capacitive branch in parallel, one end of the first spark capacitive branch is low pressure end, and the other end of the second spark capacitive branch is high-pressure side.Therefore, no matter be the electrical connection that disconnects the first capacitive branch and low pressure end, still disconnect the electrical connection of the second capacitive branch and high-pressure side, perhaps disconnect the electrical connection of the first capacitive branch and low pressure end and disconnect the electrical connection of the second capacitive branch and high-pressure side, all can realize the first capacitive branch and the second capacitive branch are broken from primary circuit, now, two ends to two capacitive branch apply respectively high frequency voltage source simultaneously, be equal to and the capacitive branch two ends applied to high frequency voltage source after two capacitive branch are in parallel, therefore, be equal to the circuit theory diagrams with Fig. 5.
In embodiment, the frequency of described test voltage is for being more than or equal to 500 hertz therein.
Therein in embodiment, described the first sparking distance branch road comprises the first sealing sparking distance, described the second sparking distance branch road comprises the second sealing sparking distance, and described the first capacitive branch comprises the first electric capacity, and described the second capacitive branch comprises the second electric capacity.
In embodiment, adopt current testing device to measure described the first capacitive branch electric current and the second capacitive branch electric current therein.
Preferably, described current testing device is the testing current instrument, and the frequency of described test voltage is for being more than or equal to 500 hertz and be less than or equal to 1500 hertz.
The frequency of high frequency voltage source determines that principle is: meet trial voltage below safe voltage 50V, reach before sparking distance triggers in order to improve the test accuracy test current (10～20) times of flowing through the equalizing capacitance working current, and under specified accuracy in testing current instrument test frequency scope (as the frequency major part of common multimeter below 1500Hz, more than the test frequency of High Precision Multimeter can reach 10kHz), frequency is also unsuitable too high, guarantee the job stability of experiment power supply and do not affect the normal operation of electronic equipment on every side, mend engineering parameter according to the major part string, optional frequency is selected (500-1500) Hz.
Once at the first capacitive branch and the second capacitive branch two ends, applied the voltage source of 40V/1000Hz, the electric current recorded is 739 μ A, 754 μ A, and all pressure ratio is 1.02, the high conformity of test data, and test effect is obvious.
Therein in embodiment, described the first sparking distance branch road comprises the first main sparking distance, described the second sparking distance branch road comprises the second main sparking distance, and described the first capacitive branch comprises the first electric capacity and the second electric capacity, and described the second capacitive branch comprises the 3rd electric capacity and the 4th electric capacity.
This embodiment removes sealing spark gap portion in Fig. 2.
Therein in embodiment, described serial connection capacitor compensating device also comprises the first sealing sparking distance branch road and the second sealing sparking distance branch road, described the first sealing sparking distance branch road comprises the first sealing sparking distance, described the second sealing sparking distance branch road comprises the second sealing sparking distance, described the first electric capacity and described the first sealing sparking distance branch circuit parallel connection form the first electric capacity sealing sparking distance branch road, and described the second electric capacity and described the second sealing sparking distance branch circuit parallel connection form the second electric capacity sealing sparking distance branch road, the first electric capacity sealing sparking distance branch road is connected with the second electric capacity sealing sparking distance branch road.
The circuit theory diagrams of this embodiment as shown in Figure 2.
Described compensator with series capaci tance sparking distance also comprises by the measuring method of equalizing capacitance intrinsic standoff ratio:
At the first electric capacity and the second electric capacity two ends, apply respectively identical test voltage;
The electric current of measuring the first electric capacity obtains the first capacitance current, and the electric current of measuring the second electric capacity obtains the second capacitance current;
Using the inverse ratio of current ratio of the first capacitance current and the second capacitance current as the intrinsic standoff ratio of the first electric capacity and the second electric capacity.
In test process, only need to untie the electrical connection of capacitor C 1 and sparking distance low pressure end, C1 and C2 are considered as respectively to CA, CB, apply high frequency voltage source T to the capacitor two ends, adopt simultaneously current tester Table A 1 and current tester Table A 2 respectively acquisition stream cross electric current I 1, the I2 of capacitor, the ratio that calculates I1 and I2 can obtain the intrinsic standoff ratio between equalizing capacitance C1 and C2.C1 C2, the C3 series connection C4 that connects is considered as respectively to CA, CB, and same way can obtain the intrinsic standoff ratio of two main gaps of series connection.Voltage U that also can shunt voltage table testing capacitor two ends, can test single capacitance when needed.
In embodiment, adopt current testing device to measure described the first capacitance current and the second capacitance current therein.
Preferably, described current testing device is the testing current instrument, and the frequency of described test voltage is for being more than or equal to 500 hertz and be less than or equal to 1500 hertz.
In embodiment, described test voltage is less than or equal to 50 volts therein.Owing to adopting the method that improves test frequency, meet under the measuring current requirement condition and test voltage can be down to below safe voltage 50V, improved Security of test, there is extremely strong anti-power frequency interference performance.
Prior art, in reality test, when adopting the power-frequency voltage source one by one during the testing capacitor value, exists test voltage high, the line-frequency induction source on series compensation platform that easily is subject to affects, need to take higher safe quarantine measures, whole test process check, consuming time, measuring accuracy is poor.If adopt the method for the split ratio that improves voltage source frequency and testing capacitor branch road, answer voltage lower, do not need isolation in test, and not disturbed by power frequency, the testing current accuracy is high, and testing time reduces, and has suffered process of the test safety, simple, quick.
Method of testing of the present invention, can reduce test voltage, improves measuring accuracy and efficiency, has stronger anti-interference simultaneously.
The inventive method is verified in horse hundred strings are mended engineering, and the classic method test needs 4 hours, only need 1 hour after employing this method, and measuring accuracy improves greatly.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the measuring method of equalizing capacitance intrinsic standoff ratio for a compensator with series capaci tance sparking distance, described serial connection capacitor compensating device comprises at least two sparking distance branch roads and at least two capacitive branch, each sparking distance branch road comprises at least one sparking distance, each capacitive branch comprises at least one electric capacity, wherein the first sparking distance branch road and the first capacitive branch formation the first spark capacitive branch in parallel, the second sparking distance branch road and the second capacitive branch formation the second spark capacitive branch in parallel, one end of the first spark capacitive branch is low pressure end, the other end of the first spark capacitive branch is connected with an end of the second spark capacitive branch, the other end of the second spark capacitive branch is high-pressure side, it is characterized in that, described measuring method comprises:
Disconnect the electrical connection of the first capacitive branch and low pressure end and/or disconnect the electrical connection of the second capacitive branch and high-pressure side;
At the first capacitive branch and the second capacitive branch two ends, apply respectively identical test voltage, and the frequency of described test voltage is more than or equal to 500 hertz;
The electric current of measuring the first capacitive branch obtains the first capacitive branch electric current, and the electric current of measuring the second capacitive branch obtains the second capacitive branch electric current;
Using the inverse ratio of current ratio of the first capacitive branch electric current and the second capacitive branch electric current as the intrinsic standoff ratio of the first capacitive branch and the second capacitive branch.
2. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 1, it is characterized in that, described the first sparking distance branch road comprises the first sealing sparking distance, described the second sparking distance branch road comprises the second sealing sparking distance, described the first capacitive branch comprises the first electric capacity, and described the second capacitive branch comprises the second electric capacity.
3. the measuring method with the equalizing capacitance intrinsic standoff ratio according to the described compensator with series capaci tance sparking distance of claim 1-2 any one, is characterized in that, adopts current testing device to measure described the first capacitive branch electric current and the second capacitive branch electric current.
4. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 3, it is characterized in that, described current testing device is the testing current instrument, and the frequency of described test voltage is for being more than or equal to 500 hertz and be less than or equal to 1500 hertz.
5. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 1, it is characterized in that, described the first sparking distance branch road comprises the first main sparking distance, described the second sparking distance branch road comprises the second main sparking distance, described the first capacitive branch comprises the first electric capacity and the second electric capacity, and described the second capacitive branch comprises the 3rd electric capacity and the 4th electric capacity.
6. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 5, it is characterized in that, described serial connection capacitor compensating device also comprises the first sealing sparking distance branch road and the second sealing sparking distance branch road, described the first sealing sparking distance branch road comprises the first sealing sparking distance, described the second sealing sparking distance branch road comprises the second sealing sparking distance, described the first electric capacity and described the first sealing sparking distance branch circuit parallel connection form the first electric capacity sealing sparking distance branch road, and described the second electric capacity and described the second sealing sparking distance branch circuit parallel connection form the second electric capacity sealing sparking distance branch road, the first electric capacity sealing sparking distance branch road is connected with the second electric capacity sealing sparking distance branch road.
7. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 6, is characterized in that, also comprises:
At the first electric capacity and the second electric capacity two ends, apply respectively identical test voltage;
The electric current of measuring the first electric capacity obtains the first capacitance current, and the electric current of measuring the second electric capacity obtains the second capacitance current;
Using the inverse ratio of current ratio of the first capacitance current and the second capacitance current as the intrinsic standoff ratio of the first electric capacity and the second electric capacity.
8. the measuring method with the equalizing capacitance intrinsic standoff ratio according to the described compensator with series capaci tance sparking distance of claim 5-7 any one, is characterized in that, adopts current testing device to measure described the first capacitance current and the second capacitance current.
9. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 8, it is characterized in that, described current testing device is the testing current instrument, and the frequency of described test voltage is for being more than or equal to 500 hertz and be less than or equal to 1500 hertz.
10. the measuring method of equalizing capacitance intrinsic standoff ratio for compensator with series capaci tance sparking distance according to claim 1, is characterized in that, described test voltage is less than or equal to 50 volts.
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