CN104777420A - High-voltage switch contact testing system and testing method thereof - Google Patents
High-voltage switch contact testing system and testing method thereof Download PDFInfo
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- CN104777420A CN104777420A CN201510162792.7A CN201510162792A CN104777420A CN 104777420 A CN104777420 A CN 104777420A CN 201510162792 A CN201510162792 A CN 201510162792A CN 104777420 A CN104777420 A CN 104777420A
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Abstract
The invention discloses a high-voltage switch contact testing system and a testing method thereof, relates to the technical field of testing of 6 kV or higher high-voltage switchgear of an electric power system, in particular to a testing system which tests opening/closing time of a high-voltage switch contact, a closing resistance value of a closing resistor contact and pre-inserting time of the closing resistor contact by applying high-frequency or pulse signals to two sides of the contact in a safety protection grounding state of two ends of a high-voltage switch, as well as a testing method of the testing system. According to the method, an inductor formed by grounding wires on two sides of the high-voltage switch contact is ingeniously utilized to apply the high-frequency or pulse signals to two sides of the contact in the safety protection grounding state of two sides of the high-voltage switch for testing of the opening/closing time of the high-voltage switch contact, the closing resistance value of the closing resistor contact and the pre-inserting time of the closing resistor contact, so that the field operation workload is reduced, the working efficiency is improved, the power failure time is shortened, meanwhile, personal safety is guaranteed, potential safety hazards are reduced, and high social benefits are realized.
Description
Technical field
The present invention relates to electric system 6kV and higher level high-tension switch gear technical field of measurement and test; be specifically related to a kind of under the state of high-voltage switch gear two ends safeguard protection ground connection, carry out high-voltage switch contact on/off switch time, switching-on resistance contact combined floodgate resistance value, the test macro of switching-on resistance contact pre-inserted time measurement and method of testing thereof by applying high frequency or pulse signal in contact both sides.
Background technology
According to work about electric power standard, need regularly Overhaul of High Voltage Circuit Breaker Equipment and test.The on/off switch time of testing high voltage switch contact, the switching-on resistance value of switching-on resistance contact, switching-on resistance contact pre-inserted time are the big events in high-voltage switch gear test.By electrical safe working order requirement, during high-voltage switch gear interruption maintenance, must ground connection in order to ensure personal safety high-voltage switch gear both sides.Existing high-voltage switch contact testing tool is all apply direct current signal in contact both sides, when high-voltage switch contact both sides ground connection, defines closed-loop path in contact both sides.Therefore the time parameter of high-voltage switch contact cannot be measured.Existing instrument just requires the ground wire disconnecting high-voltage switch contact side when measuring high-voltage switch contact time parameter.This method of testing adds execute-in-place amount and potential safety hazard.
Summary of the invention
Technical matters to be solved by this invention there is provided a kind of test macro and method of testing thereof of easy to use, simple to operate, high-voltage switch contact that security is good.
The present invention adopts following technical scheme:
The test macro of high-voltage switch contact and a method of testing thereof, its test macro comprises disconnecting link 1G and 2G, the AC power V1 being connected in parallel on high-voltage switch contact DL both sides, the resistance R1 connected with AC power V1 and the A/D sample circuit that are under closed ground state that lay respectively at high-voltage switch gear both sides; Described A/D sample circuit is respectively used to measure the magnitude of voltage at AC power V1 two ends and the magnitude of voltage at resistance R1 two ends.
Further, described AC power is high-frequency constant potential source, the voltage source of more than 10HZ, the current source of more than 10HZ or pulse signal.
Further, described A/D sample circuit comprises front end signal treatment circuit and analog to digital conversion circuit, the input end of described front end signal treatment circuit is connected in parallel on AC power V1 and resistance R1 two ends respectively, the input end of the output termination analog to digital conversion circuit of described front end signal treatment circuit, the output termination testing tool computing machine of analog-digital conversion circuit as described.
Further, described front end signal treatment circuit comprises the operational amplifier and peripheral circuit thereof that model is LF412; The A/D converter of analog-digital conversion circuit as described to be model be A/DS8364.
Utilize the method for testing of the test macro of high-voltage switch contact, it comprises the steps:
Step 1: disconnecting link 1G and 2G remaining in high-voltage switch gear both sides closes, and makes it be in ground state, forms galvanic circle;
Step 2: the AC power V1 in parallel in high-voltage switch contact DL both sides, and the resistance R1 of a known resistance on connecting on AC power V1, further, the equivalent electrical circuit of described high-voltage switch contact DL is in parallel with main contact K2 after switching-on resistance R connects with switching-on resistance contact K1, the output termination testing tool computing machine of described A/D sample circuit;
A/D sample circuit is utilized to measure the output voltage values of AC power V1 and the magnitude of voltage at resistance R1 two ends;
Step 3: according to the equivalent electrical circuit of high-voltage switch contact DL, divide at high-voltage switch contact, in making process, the output voltage values of the AC power V1 utilizing the measurement of A/D sample circuit to obtain and the magnitude of voltage at resistance R1 two ends can change, and change procedure calculates the time parameter of high-voltage switch gear accordingly.
Further, the time parameter of described high-voltage switch gear comprises switching-on resistance contact pre-inserted time, the separating brake of high-voltage switch contact or the switching-on resistance value of closing time and switching-on resistance contact.
Further, the method for testing of described switching-on resistance contact pre-inserted time is as follows:
According to the equivalent electrical circuit of high-voltage switch contact DL, when high-voltage switch gear is in open position and K1 and K2 all disconnects.The magnitude of voltage at resistance R1 two ends is U
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I
01=U
01/ R1; When there is switching-on resistance contact pre-inserted, when namely in corresponding equivalent electrical circuit, contact K1 closes, the magnitude of voltage at resistance R1 two ends is U '
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I '
01=U '
01/ R1; When in equivalent electrical circuit, main contact K2 closes, then the magnitude of voltage at described resistance R1 two ends is U "
01, be reflected to according to Ohm law on described testing tool computing machine, the current value calculated on described resistance R1 is I "
01=U "
01/ R1;
Make high-voltage switch gear do feed motion and closing coil is charged, recording time point is this moment T1, and the magnitude of voltage with seasonal A/D sample circuit real-time measuring resistance R1 two ends is U
01, when detecting that the magnitude of voltage at resistance R1 two ends changes as U '
01time, recording time point is this moment T2.The magnitude of voltage continuing to detect resistance R1 two ends changes as U "
01time, recording time point is this moment T3.The corresponding switching-on resistance contact pre-inserted time is obtained by the mistiming calculating T3 and T2.
Further, the separating brake of described high-voltage switch contact or the method for testing of closing time as follows:
Closing time is tested: according to the equivalent electrical circuit of high-voltage switch contact DL, when high-voltage switch gear is in open position and K1 and K2 all disconnects, the magnitude of voltage at resistance R1 two ends is U
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I
01=U
01/ R1; When main contact occurring and closing a floodgate, namely in corresponding equivalent electrical circuit, main contact K2 closes, and the magnitude of voltage at resistance R1 two ends is U "
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I "
01=U "
01/ R1;
Make high-voltage switch gear do feed motion and closing coil is charged, recording time point is this moment T1, with the magnitude of voltage at seasonal A/D sample circuit real-time measuring resistance R1 two ends, when detecting that the magnitude of voltage at resistance R1 two ends changes as U "
01time, recording time point is this moment T3, is obtained the closing time of corresponding high-voltage switch contact by the mistiming calculating T3 and T1.
Opening time is tested: according to the equivalent electrical circuit of high-voltage switch contact DL, and when high-voltage switch gear is in closing position and K1 and K2 is all closed, the magnitude of voltage at resistance R1 two ends is U "
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I "
01=U "
01/ R1; When there is main contact separating brake, when namely in corresponding equivalent electrical circuit, switching-on resistance contact K1 and main contact K2 all disconnects, the magnitude of voltage at resistance R1 two ends is U
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I
01=U
01/ R1;
Make high-voltage switch gear do separating brake action and switching winding charged, recording time point is this moment T1 ', with the magnitude of voltage at seasonal A/D sample circuit real-time measuring resistance R1 two ends, when detecting that the magnitude of voltage at resistance R1 two ends changes as U
01time, recording time point is this moment T2 ', obtains the opening time of corresponding high-voltage switch contact by calculating T2 ' and the mistiming of T1 '.
Further, the method for testing of the switching-on resistance value of described switching-on resistance contact is as follows:
Under high-voltage switch gear is in open position, both sides disconnecting link 1G, 2G ground state, the magnitude of voltage at the resistance R1 two ends utilizing A/D sample circuit to measure in real time is U
01, the magnitude of voltage at AC power V1 two ends is U
02, be I according to the current value that Ohm law calculates on now resistance R1
01=U
01/ R1, so obtain high-voltage switch gear be in open position, both sides disconnecting link 1G, 2G ground state under equiva lent impedance, described equiva lent impedance is Z1=(U
02-U
01)/I
01;
After in the equivalent electrical circuit of high-voltage switch contact DL, switching-on resistance contact K1 closes, the magnitude of voltage that A/D sample circuit records resistance R1 two ends is again U '
01, the magnitude of voltage at AC power V1 two ends is U '
02, the current value calculated on described resistance R1 is I '
01=U '
01equiva lent impedance after/R1, and then under obtaining switching-on resistance contact K1 closure state, equiva lent impedance Z1 and switching-on resistance R parallel connection be Z2=(U '
02-U '
01)/I '
01, according to 1/Z2=1/Z1+1/R, the resistance calculating switching-on resistance R is R=Z1 × Z2/ (Z1-Z2).
Beneficial effect of the present invention is as follows:
The inductance that the present invention utilizes high-voltage switch contact both sides ground wire to form dexterously; under the state of high-voltage switch gear both sides safeguard protection ground connection; adopt the method for carrying out high-voltage switch contact on/off switch time, switching-on resistance contact combined floodgate resistance value, the time measurement of switching-on resistance pre-inserted at contact both sides applying high frequency or pulse signal; reduce execute-in-place amount; improve work efficiency, shorten power off time, ensure that personal safety simultaneously; reduce potential safety hazard, there is very high social benefit.
Accompanying drawing explanation
Fig. 1 is whole implementation circuit theory diagrams of the present invention.
Fig. 2 is the equivalent circuit diagram under the disconnecting link ground state of Fig. 1 high-voltage switch both sides.
Fig. 3 is the equivalent circuit diagram under Fig. 2 high-voltage switch is in open position, both sides disconnecting link ground state.
Fig. 4 is the closed rear equivalent circuit diagram of Fig. 2 high-voltage switch switching-on resistance contact K1.
Fig. 5 is the closed rear equivalent circuit diagram of main contact K2 in Fig. 2.
Embodiment
Below in conjunction with accompanying drawing 1 ~ 5, the invention will be further described.
Embodiment: if Fig. 1 is whole implementation circuit diagram, Fig. 1 is at high-voltage switch gear both sides disconnecting link 1G, under 2G ground state, by applying high frequency voltage source V1 in high-voltage switch contact DL both sides, certainly the voltage source of the lower frequency of more than 10HZ can also be adopted, the current source of more than 10HZ or pulse signal etc., signal transacting and A/D conversion is carried out by A/D sample circuit, thus the voltage at high frequency voltage source V1 and known resistance R1 two ends is measured, carry out the high-voltage switch contact on/off switch time accordingly, switching-on resistance contact combined floodgate resistance value R, the test macro of switching-on resistance pre-inserted time measurement and method thereof.
Described disconnecting link 1G, 2G are also disconnector 1G, 2G;
Main working process comprises: the galvanic circle consisted of disconnector 1G, 2G ground connection or the ground connection of high-voltage switch gear both sides, be applied to high frequency voltage source V1 and the known resistance R1 of high-voltage switch contact DL both sides, measure the A/D sample circuit of high frequency voltage source V1 both end voltage; Measure the A/D sample circuit of high frequency voltage source V1 output current, namely described high frequency voltage source V1 output current is measured by the A/D sample circuit be added on resistance R1 and is obtained according to Ohm law.Fig. 2 is the equivalent circuit diagram of Fig. 1, is the series circuit of inductance L 1 and resistance R2 by high-voltage switch gear both sides disconnecting link 1G, 2G circuit equivalent under ground state.
Fig. 3 is that high-voltage switch gear is in equivalent impedance Z 1 under open position, both sides disconnecting link 1G, 2G ground state, and apply the test macro of high frequency voltage source V1 in high-voltage switch contact DL both sides, its test circuit equivalent schematic diagram is Fig. 3.By the output voltage U of test high frequency voltage source V1
02with the voltage U on known resistance R1
01, counter circuit electric current, the current value namely on resistance R1 is I
01=U
01/ R1, can calculate the equiva lent impedance Z1=(U under disconnecting link 1G, 2G ground state of both sides by Ohm law
02-U
01)/I
01.
Fig. 4 is the closed rear equivalent electrical circuit of Fig. 2 high-voltage switch switching-on resistance contact K1, in like manner by the output voltage U ' of test high frequency voltage source V1
02with the voltage U on known resistance R1 '
01, counter circuit electric current, the current value namely on resistance R1 is I '
01=U '
01/ R1, by Ohm law can calculate impedance Z 1 that inductance L 1 under disconnecting link 1G, 2G ground state of both sides and resistance R2 be connected in parallel with switching-on resistance R after equiva lent impedance be Z2=(U '
02-U '
01)/I '
01, the resistance R=Z1 × Z2/ (Z1-Z2) of switching-on resistance is calculated according to the computing formula 1/Z2=1/Z1+1/R of parallel resistance.
Fig. 5 be in Fig. 2 main contact K2 close after equivalent electrical circuit, according to known equivalent electrical circuit, the voltage U by the voltage U 2 of test high frequency voltage source V1 and known resistance R1 "
01, calculating loop current is I "
01=U "
01/ R1, when resistance R1 occurring the electric current of this value, record time point is this moment T3, calculates when T3 and high-voltage switch gear close a floodgate and mistiming between time point T1 that closing coil is charged, the closing time of this mistiming and high-voltage switch contact.In like manner, the opening time of high-voltage switch contact can be calculated.
In like manner, when the moment that contact K1 is closed, loop current also can change, and according to known equivalent electrical circuit, also have a theoretical loop current value, namely loop current becomes I '
01=U '
01/ R1, when resistance R1 occurring the electric current of this value, record time point is this moment T2;
When the moment that main contact K2 is closed, loop current changes again, and also have a loop current value in theory, namely loop current becomes I "
01=U "
01/ R1, when resistance R1 occurring the electric current of this value, record time point is this moment T3, by calculating mistiming, this mistiming and the switching-on resistance contact pre-inserted time between T3 and T2.
The time parameter of the on/off switch time of high-voltage switch contact, the high-voltage switch gear such as switching-on resistance value, switching-on resistance contact pre-inserted time of switching-on resistance contact can be calculated by this curent change process.
Described testing tool computing machine is the common computing machine with computing function, is built-in with the program according to electricity formulae discovery.
Described high-voltage switch gear is rated voltage 6kV and the above electrical equipment being mainly used in cut-offfing and closing galvanic circle.
The above embodiment is only the preferred embodiments of the present invention, and and the feasible enforcement of non-invention exhaustive.For persons skilled in the art, to any apparent change done by it under the prerequisite not deviating from the principle of the invention and spirit, all should be contemplated as falling with within claims of the present invention.
Claims (9)
1. the test macro of a high-voltage switch contact, it comprises disconnecting link 1G and 2G be under closed ground state laying respectively at high-voltage switch gear both sides, it is characterized in that: also comprise the AC power V1 being connected in parallel on high-voltage switch contact DL both sides, the resistance R1 connected with AC power V1 and A/D sample circuit; The input end of described A/D sample circuit is connected on the two ends of AC power V1 and resistance R1 respectively, the input end of the computing machine of the output termination testing tool of described A/D sample circuit.
2. the test macro of a kind of high-voltage switch contact according to claim 1, is characterized in that: described AC power is high-frequency constant potential source, the voltage source of more than 10HZ, the current source of more than 10HZ or pulse signal.
3. the test macro of a kind of high-voltage switch contact according to claim 1, it is characterized in that: described A/D sample circuit comprises front end signal treatment circuit and analog to digital conversion circuit, the input end of described front end signal treatment circuit is connected in parallel on AC power V1 and resistance R1 two ends respectively, the input end of the output termination analog to digital conversion circuit of described front end signal treatment circuit, the computing machine of the output termination testing tool of analog-digital conversion circuit as described.
4. the test macro of a kind of high-voltage switch contact according to claim 3, is characterized in that: described front end signal treatment circuit comprises the operational amplifier and peripheral circuit thereof that model is LF412; The A/D converter of analog-digital conversion circuit as described to be model be A/DS8364.
5. utilize a method of testing for the test macro of arbitrary described high-voltage switch contact in claim 1 ~ 4, it is characterized in that: it comprises the steps:
Step 1: disconnecting link 1G and 2G remaining in high-voltage switch gear both sides closes, and makes it be in ground state, forms galvanic circle;
Step 2: the AC power V1 in parallel in high-voltage switch contact DL both sides, and the equivalent electrical circuit of the resistance R1 of a known resistance on connecting on AC power V1, described high-voltage switch contact DL is switching-on resistance R connect with switching-on resistance contact K1 after in parallel with main contact K2; A/D sample circuit is utilized to measure the output voltage values of AC power V1 and the magnitude of voltage at resistance R1 two ends;
Step 3: according to the equivalent electrical circuit of high-voltage switch contact DL, divide at high-voltage switch contact, in making process, the output voltage values of the AC power V1 utilizing the measurement of A/D sample circuit to obtain and the magnitude of voltage at resistance R1 two ends can change, and change procedure calculates the time parameter of high-voltage switch gear accordingly.
6. method of testing according to claim 5, is characterized in that: the time parameter of described high-voltage switch gear comprises the switching-on resistance value of switching-on resistance contact pre-inserted time, the separating brake of high-voltage switch contact, closing time and switching-on resistance contact.
7. method of testing according to claim 6, is characterized in that: the method for testing of described switching-on resistance contact pre-inserted time is as follows:
According to the equivalent electrical circuit of high-voltage switch contact DL, when high-voltage switch gear is in open position and K1 and K2 all disconnects, the magnitude of voltage at resistance R1 two ends is U
01, be reflected to according to Ohm law on described testing tool computing machine, the current value calculated on resistance R1 is I
01=U
01/ R1; When there is switching-on resistance contact pre-inserted, when namely in corresponding equivalent electrical circuit, contact K1 closes, the magnitude of voltage at resistance R1 two ends is U '
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I '
01=U '
01/ R1; When in equivalent electrical circuit, main contact K2 closes, the magnitude of voltage at resistance R1 two ends is U "
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I "
01=U "
01/ R1;
Make high-voltage switch gear do feed motion and closing coil is charged, recording time point is this moment T1, and the magnitude of voltage with seasonal A/D sample circuit real-time measuring resistance R1 two ends is U
01, when detecting that the magnitude of voltage at resistance R1 two ends changes as U '
01time, recording time point is this moment T2;
The magnitude of voltage continuing to detect resistance R1 two ends changes as U "
01time, recording time point is this moment T3;
The corresponding switching-on resistance contact pre-inserted time is obtained by the mistiming calculating T3 and T2.
8. method of testing according to claim 6, is characterized in that: the combined floodgate of described high-voltage switch contact, the method for testing of opening time are as follows:
Closing time is tested: according to the equivalent electrical circuit of high-voltage switch contact DL, when high-voltage switch gear is in open position and K1 and K2 all disconnects, the magnitude of voltage at resistance R1 two ends is U
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I
01=U
01/ R1; When main contact occurring and closing a floodgate, namely in corresponding equivalent electrical circuit, main contact K2 closes, and the magnitude of voltage at resistance R1 two ends is U "
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I "
01=U "
01/ R1;
Make high-voltage switch gear do feed motion and closing coil is charged, recording time point is this moment T1, with the magnitude of voltage at seasonal A/D sample circuit real-time measuring resistance R1 two ends, when detecting that the magnitude of voltage at resistance R1 two ends changes as U "
01time, recording time point is this moment T3, is obtained the closing time of corresponding high-voltage switch contact by the mistiming calculating T3 and T1;
Opening time is tested: according to the equivalent electrical circuit of high-voltage switch contact DL, and when high-voltage switch gear is in closing position and K1 and K2 is all closed, the magnitude of voltage at resistance R1 two ends is U "
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I "
01=U "
01/ R1; When there is main contact separating brake, when namely in corresponding equivalent electrical circuit, switching-on resistance contact K1 and main contact K2 all disconnects, the magnitude of voltage at resistance R1 two ends is U
01, be reflected to according to Ohm law on testing tool computing machine, the current value calculated on resistance R1 is I
01=U
01/ R1;
Make high-voltage switch gear do separating brake action and switching winding charged, recording time point is this moment T1 ', with the magnitude of voltage at seasonal A/D sample circuit real-time measuring resistance R1 two ends, when detecting that the magnitude of voltage at resistance R1 two ends changes as U
01time, recording time point is this moment T2 ', obtains the opening time of corresponding high-voltage switch contact by calculating T2 ' and the mistiming of T1 '.
9. method of testing according to claim 6, is characterized in that: the method for testing of the switching-on resistance value of described switching-on resistance contact is as follows:
Under high-voltage switch gear is in open position, both sides disconnecting link 1G, 2G ground state, the magnitude of voltage at the resistance R1 two ends utilizing A/D sample circuit to measure in real time is U
01, the magnitude of voltage at AC power V1 two ends is U
02, be I according to the current value that Ohm law calculates on now resistance R1
01=U
01/ R1, so obtain high-voltage switch gear be in open position, both sides disconnecting link 1G, 2G ground state under equiva lent impedance, described equiva lent impedance is Z1=(U
02-U
01)/I
01;
After in the equivalent electrical circuit of high-voltage switch contact DL, contact K1 closes, the magnitude of voltage that A/D sample circuit records resistance R1 two ends is again U '
01, the magnitude of voltage at AC power V1 two ends is U '
02, the current value calculated on resistance R1 is I '
01=U '
01equiva lent impedance after/R1, and then under obtaining contact K1 closure state, equiva lent impedance Z1 and switching-on resistance R parallel connection be Z2=(U '
02-U '
01)/I '
01, according to 1/Z2=1/Z1+1/R, the resistance calculating switching-on resistance R is R=Z1 × Z2/ (Z1-Z2).
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