CN104777420B - The test system and its test method of a kind of high-voltage switch contact - Google Patents
The test system and its test method of a kind of high-voltage switch contact Download PDFInfo
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- CN104777420B CN104777420B CN201510162792.7A CN201510162792A CN104777420B CN 104777420 B CN104777420 B CN 104777420B CN 201510162792 A CN201510162792 A CN 201510162792A CN 104777420 B CN104777420 B CN 104777420B
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Abstract
The invention discloses the test systems and its test method of a kind of high-voltage switch contact; it is related to electric system 6kV and with higher level's high-tension switch gear technical field of measurement and test; more particularly to one kind in the state of high-voltage switch gear both ends safeguard protection ground connection, by applying high frequency or pulse signal progress high-voltage switch contact on/off switch time, switching-on resistance contact combined floodgate resistance value, the test system and its test method of switching-on resistance contact pre-inserted time measurement in contact both sides.The inductance that the present invention is dexterously formed using high-voltage switch contact both sides ground wire; in the state of high-voltage switch gear both sides safeguard protection ground connection; high-voltage switch contact on/off switch time, switching-on resistance contact combined floodgate resistance value, the method for switching-on resistance pre-inserted time measurement are carried out using in contact both sides application high frequency or pulse signal; reduce execute-in-place amount; it improves work efficiency, shortens power off time, while ensure that personal safety; security risk is reduced, there is very high social benefit.
Description
Technical field
The present invention relates to electric system 6kV and with higher level's high-tension switch gear technical field of measurement and test, and in particular to Yi Zhong
In the state of high-voltage switch gear both ends safeguard protection ground connection, by applying high frequency or pulse signal progress high-voltage switch gear in contact both sides
Contactor opening time, switching-on resistance contact combined floodgate resistance value, the test system of switching-on resistance contact pre-inserted time measurement and
Its test method.
Background technology
According to work about electric power standard, need periodically to Overhaul of High Voltage Circuit Breaker Equipment and experiment.The conjunction of testing high voltage switch contact
Opening time, the switching-on resistance value of switching-on resistance contact, the pre-inserted angle of incidence of switching-on resistance contact are the weights in high-voltage switch gear experiment
Want project.By electrical safe working order requirement, during high-voltage switch gear interruption maintenance, in order to ensure personal safety high-voltage switch gear both sides
It must be grounded.Existing high-voltage switch contact test equipment is entirely to apply direct current signal in contact both sides, when high-voltage switch gear touches
During the ground connection of head both sides, closed circuit is formd in contact both sides.Therefore the time parameter of high-voltage switch contact can not be measured.It is existing
Instrument require to disconnect the ground wire of high-voltage switch contact side when measuring high-voltage switch contact time parameter.This test
Method increases execute-in-place amount and security risk.
Invention content
There is provided a kind of high pressures easy to use, easy to operate, safety is good for the technical problems to be solved by the invention
The test system and its test method of switch contact.
The present invention adopts the following technical scheme that：
The test system and its test method of a kind of high-voltage switch contact, test system include being located at high-voltage switch gear respectively
Both sides in be closed ground state under disconnecting link 1G and 2G, be connected in parallel on high-voltage switch contact DL both sides AC power V1, with
Resistance R1 and the A/D sample circuit of AC power V1 series connection；The A/D sample circuits are respectively used to measure AC power V1 two
The voltage value at end and the voltage value at resistance R1 both ends.
Further, the AC power for high frequency constant pressure source, the voltage source of more than 10HZ, more than 10HZ current source or
Pulse signal.
Further, the A/D sample circuits include front end signal processing circuit and analog to digital conversion circuit, the front end letter
The input terminal of number processing circuit is connected in parallel on AC power V1 and resistance R1 both ends, the output of the front end signal processing circuit respectively
Terminate the input terminal of analog to digital conversion circuit, the output termination test equipment computer of analog-digital conversion circuit as described.
Further, the front end signal processing circuit includes the operational amplifier and its peripheral circuit of model LF412；
Analog-digital conversion circuit as described is the A/D converter of model A/DS8364.
Using the test method of the test system of high-voltage switch contact, include the following steps：
Step 1：The disconnecting link 1G and 2G for remaining in high-voltage switch gear both sides are closed, and are at ground state, are formed conductive
Circuit；
Step 2：In high-voltage switch contact DL both sides parallel connection AC power V1, and on AC power V1 in series connection known to one
The resistance R1 of resistance value, further, the equivalent circuit of the high-voltage switch contact DL is switching-on resistance R and switching-on resistance contact K1
It is in parallel with main contact K2 after series connection, the output termination test equipment computer of the A/D sample circuits；
The output voltage values of AC power V1 and the voltage value at resistance R1 both ends are measured using A/D sample circuits；
Step 3：According to the equivalent circuit of high-voltage switch contact DL it is found that during high-voltage switch contact switching on and off, profit
The output voltage values of the AC power V1 obtained with A/D sample circuit measurements and the voltage value at resistance R1 both ends can change,
Change procedure calculates the time parameter of high-voltage switch gear accordingly.
Further, the time parameter of the high-voltage switch gear includes the pre-inserted angle of incidence of switching-on resistance contact, high-voltage switch gear touches
The separating brake of head or the switching-on resistance value of closing time and switching-on resistance contact.
Further, the test method of the pre-inserted angle of incidence of switching-on resistance contact is as follows：
According to the equivalent circuit of high-voltage switch contact DL it is found that being disconnected when high-voltage switch gear is in open position, that is, K1 and K2
When.The voltage value at resistance R1 both ends is U01, reflect on test equipment computer according to Ohm's law, calculate on resistance R1
Current value is I01= U01/R1；When switching-on resistance contact pre-inserted occurs, that is, when corresponding to contact K1 closures in equivalent circuit, electricity
The voltage value for hindering R1 both ends is U '01, reflect on test equipment computer according to Ohm's law, calculate the electric current on resistance R1
It is worth for I '01= U′01/R1；When main contact K2 is closed in equivalent circuit, then the voltage value at the resistance R1 both ends is U "01, instead
It reflects according to Ohm's law on the test equipment computer, it is I " to calculate the current value on the resistance R101= U″01/
R1；
High-voltage switch gear is enabled to do feed motion i.e. closing coil to charge, time point is T1 to record this moment, with season A/D sampling electricity
The voltage value that road measures resistance R1 both ends in real time is U01, when the voltage value for detecting resistance R1 both ends changes as U '01When,
Time point is T2 to record this moment.The voltage value for continuing detection resistance R1 both ends changes as U "01When, time point is record this moment
T3.By calculating T3 the corresponding pre-inserted angle of incidence of switching-on resistance contact is obtained with the time difference of T2.
Further, the separating brake of the high-voltage switch contact or the test method of closing time are as follows：
Closing time is tested：According to the equivalent circuit of high-voltage switch contact DL it is found that when high-voltage switch gear is in open position
That is when K1 and K2 are disconnected, the voltage value at resistance R1 both ends is U01, reflect on test equipment computer according to Ohm's law, meter
It is I to calculate the current value on resistance R101= U01/R1；When main contact combined floodgate occurs, that is, correspond to main contact K2 in equivalent circuit
It is closed, the voltage value at resistance R1 both ends is U "01, reflect on test equipment computer according to Ohm's law, calculate resistance R1
On current value be I "01= U″01/R1；
High-voltage switch gear is enabled to do feed motion i.e. closing coil to charge, time point is T1 to record this moment, with season A/D sampling electricity
Road measures the voltage value at resistance R1 both ends in real time, when the voltage value for detecting resistance R1 both ends changes as U "01When, record this
Time point at quarter is T3, and the closing time of corresponding high-voltage switch contact is obtained with the time difference of T1 by calculating T3.
Opening time is tested：According to the equivalent circuit of high-voltage switch contact DL it is found that when high-voltage switch gear is in closing position
That is when K1 and K2 are closed, the voltage value at resistance R1 both ends is U "01, reflect on test equipment computer according to Ohm's law,
It is I " to calculate the current value on resistance R101= U″01/R1；When main contact separating brake occurs, that is, correspond in equivalent circuit and close a floodgate
When resistance contact head K1 and main contact K2 are disconnected, the voltage value at resistance R1 both ends is U01, reflect root on test equipment computer
According to Ohm's law, it is I to calculate the current value on resistance R101= U01/R1；
High-voltage switch gear is enabled to do separating brake action i.e. switching winding to charge, time point is T1 ' to record this moment, is sampled with season A/D
Circuit measures the voltage value at resistance R1 both ends in real time, when the voltage value for detecting resistance R1 both ends changes as U01When, record
Time point is T2 ' this moment, and the opening time of corresponding high-voltage switch contact is obtained with the time difference of T1 ' by calculating T2 '.
Further, the test method of the switching-on resistance value of the switching-on resistance contact is as follows：
In the case where high-voltage switch gear is in open position, both sides disconnecting link 1G, 2G ground state, surveyed in real time using A/D sample circuits
The voltage value at the resistance R1 both ends of amount is U01, the voltage value at AC power V1 both ends is U02, calculated at this time according to Ohm's law
Current value on resistance R1 is I01= U01/ R1, and then obtain high-voltage switch gear and be in open position, both sides disconnecting link 1G, 2G ground connection shape
Equiva lent impedance under state, the equiva lent impedance are Z1=(U02- U01)/ I01；
After switching-on resistance contact K1 in the equivalent circuit of high-voltage switch contact DL is closed, A/D sample circuits measure again
The voltage value at resistance R1 both ends is U '01, the voltage value at AC power V1 both ends is U '02, calculate the current value on the resistance R1
For I '01= U′01After/R1, and then obtain under switching-on resistance contact K1 closed states, equiva lent impedance Z1 and switching-on resistance R parallel connections
Equiva lent impedance is Z2=(U '02- U '01)/ I′01, according to 1/Z2=1/Z1+1/R, the resistance value for calculating switching-on resistance R is R=Z1
× Z2/ (Z1-Z2).
Beneficial effects of the present invention are as follows：
The inductance that the present invention is dexterously formed using high-voltage switch contact both sides ground wire is protected safely in high-voltage switch gear both sides
In the state of shield ground connection, high-voltage switch contact on/off switch time, conjunction are carried out using in contact both sides application high frequency or pulse signal
Lock resistance contact head switching-on resistance value, the method for switching-on resistance pre-inserted time measurement, reduce execute-in-place amount, improve work
Efficiency shortens power off time, while ensure that personal safety, reduces security risk, has very high social benefit.
Description of the drawings
Fig. 1 is the whole implementation circuit diagram of the present invention.
Fig. 2 is the equivalent circuit diagram under the disconnecting link ground state of Fig. 1 high-voltage switchs both sides.
Fig. 3 is the equivalent circuit diagram that Fig. 2 high-voltage switchs are under open position, both sides disconnecting link ground state.
Equivalent circuit diagram after Fig. 4 is closed for Fig. 2 high-voltage switch switching-on resistance contacts K1.
Equivalent circuit diagram after Fig. 5 is closed for main contact K2 in Fig. 2.
Specific embodiment
1 ~ 5 the invention will be further described below in conjunction with the accompanying drawings.
Embodiment：As Fig. 1 be whole implementation circuit diagram, Fig. 1 be under disconnecting link 1G, 2G ground state of high-voltage switch gear both sides,
By applying high frequency voltage source V1 in high-voltage switch contact DL both sides, the voltage of the lower frequency of more than 10HZ can also be used certainly
Source, the current source of more than 10HZ or pulse signal etc. carry out signal processing by A/D sample circuits and A/D are converted, so as to height
Frequency voltage source V1 and the voltage at known resistance R1 both ends measure, and carry out the high-voltage switch contact on/off switch time accordingly, close a floodgate
Resistance contact head switching-on resistance value R, the test system and method for switching-on resistance pre-inserted time measurement.
Described disconnecting link 1G, 2G are also disconnecting switch 1G, 2G；
Main working process includes：It is made up of disconnecting switch 1G, the 2G ground connection of high-voltage switch gear both sides or ground connection
Galvanic circle, be applied to the high frequency voltage source V1 of high-voltage switch contact DL both sides and known resistance R1, measure high frequency voltage source
The A/D sample circuits of V1 both end voltages；Measure the A/D sample circuits of high frequency voltage source V1 output currents, the high frequency voltage source
V1 output currents are to be measured by the A/D sample circuits being added on resistance R1 and obtained according to Ohm's law.Fig. 2 be Fig. 1 etc.
Circuit diagram is imitated, by the series connection that the circuit equivalent of high-voltage switch gear both sides disconnecting link 1G, 2G under ground state is inductance L1 and resistance R2
Circuit.
Fig. 3 is in equivalent impedance Z 1 under open position, both sides disconnecting link 1G, 2G ground state for high-voltage switch gear, is pressed off in height
The test system that contact DL both sides apply high frequency voltage source V1 is closed, test circuit equivalent schematic diagram is Fig. 3.By testing high frequency
The output voltage U of voltage source V102With the voltage U on known resistance R101, the current value on counter circuit electric current, i.e. resistance R1 is
I01= U01/ R1 can calculate equiva lent impedance Z1=(U under disconnecting link 1G, 2G ground state of both sides by Ohm's law02
U01)/ I01。
Equivalent circuit after Fig. 4 is closed for Fig. 2 high-voltage switch switching-on resistance contacts K1, similarly by testing high frequency voltage source
The output voltage U ' of V102With the voltage U ' on known resistance R101, the current value on counter circuit electric current, i.e. resistance R1 is I '01=
U′01/ R1 can calculate what inductance L1 under disconnecting link 1G, 2G ground state of both sides and resistance R2 was connected by Ohm's law
Equiva lent impedance after impedance Z 1 is in parallel with switching-on resistance R is Z2=(U '02- U '01)/ I′01, it is public according to the calculating of parallel resistance
Formula 1/Z2=1/Z1+1/R calculates resistance value R=Z1 × Z2/ (Z1-Z2) of switching-on resistance.
Fig. 5 is the equivalent circuit after main contact K2 closures in Fig. 2, according to known equivalent circuit, by testing high-frequency electrical
Voltage U " on the voltage U2 and known resistance R1 of potential source V101, loop current is calculated as I "01= U″01/ R1, when on resistance R1
When there is the electric current of this value, the time point recorded this moment is T3, when calculating T3 closes a floodgate with high-voltage switch gear, that is, closing coil electrification
Time point T1 between time difference, the closing time of the time difference, that is, high-voltage switch contact.Similarly, high-voltage switch gear can be calculated
The opening time of contact.
Similarly, when the moment that contact K1 is closed, loop current can also change, according to known equivalent circuit, also have
One theoretical loop current value, i.e. loop current become I '01= U′01/ R1, when occurring the electric current of this value on resistance R1, note
The time point of record this moment is T2；
When the moment that main contact K2 is closed, loop current changes again, also there are one theoretically loop current value, i.e.,
Loop current becomes I "01= U″01/ R1, when occurring the electric current of this value on resistance R1, the time point recorded this moment is T3, is led to
Spend the time difference calculated between T3 and T2, the time difference, that is, pre-inserted angle of incidence of switching-on resistance contact.
The conjunction of the on/off switch time, switching-on resistance contact of high-voltage switch contact can be calculated by this curent change process
Lock resistance value, the contour time parameter to compress switch of the pre-inserted angle of incidence of switching-on resistance contact.
The test equipment computer is the common computer for carrying computing function, is built-in with what is calculated according to electrical equation
Program.
The high-voltage switch gear for rated voltage 6kV and more than be mainly used for cut-offfing and close the electric appliance of galvanic circle.
Embodiment described above is merely a preferred embodiment of the present invention, and the simultaneously exhaustion of the feasible implementation of non-present invention.It is right
For persons skilled in the art, under the premise of without departing substantially from the principle of the invention and spirit to any aobvious made by it and
The change being clear to should be all contemplated as falling within the claims of the present invention.
Claims (7)
1. a kind of test system of high-voltage switch contact is closed ground state including being located at being in for high-voltage switch gear both sides respectively
Under disconnecting link 1G and 2G, it is characterised in that：Further include the AC power V1 and alternating current for being connected in parallel on high-voltage switch contact DL both sides
Resistance R1 and the A/D sample circuit of source V1 series connection；The input terminal of the A/D sample circuits is connected on AC power V1 and electricity respectively
Hinder the both ends of R1, the input terminal of the computer of the output termination test equipment of the A/D sample circuits；
The AC power is high frequency constant pressure source, the current source or pulse signal of the voltage source of more than 10HZ, more than 10HZ；
The A/D sample circuits include front end signal processing circuit and analog to digital conversion circuit, the front end signal processing circuit
Input terminal is connected in parallel on AC power V1 and resistance R1 both ends, the output termination analog-to-digital conversion of the front end signal processing circuit respectively
The input terminal of circuit, the computer of the output termination test equipment of analog-digital conversion circuit as described.
2. a kind of test system of high-voltage switch contact according to claim 1, it is characterised in that：At the front end signal
Reason circuit includes the operational amplifier and its peripheral circuit of model LF412；Analog-digital conversion circuit as described is model A/
The A/D converter of DS8364.
3. a kind of test method of the test system of high-voltage switch contact using described in claims 1 or 22, it is characterised in that：
It includes the following steps：
Step 1：The disconnecting link 1G and 2G for remaining in high-voltage switch gear both sides are closed, and are at ground state, form galvanic circle；
Step 2：In high-voltage switch contact DL both sides parallel connection AC power V1, and on AC power V1 series connection on resistance value known to one
Resistance R1, the high-voltage switch contact DL equivalent circuit connect for switching-on resistance R with switching-on resistance contact K1 after with lead it is tactile
Head K2 is in parallel；The output voltage values of AC power V1 and the voltage value at resistance R1 both ends are measured using A/D sample circuits；
Step 3：According to the equivalent circuit of high-voltage switch contact DL it is found that during high-voltage switch contact switching on and off, A/ is utilized
The output voltage values for the AC power V1 that D sample circuit measurements obtain and the voltage value at resistance R1 both ends can change, accordingly
Change procedure calculates the time parameter of high-voltage switch gear.
4. test method according to claim 3, it is characterised in that：The time parameter of the high-voltage switch gear includes the electricity that closes a floodgate
Hinder the switching-on resistance value of the pre-inserted angle of incidence of contact, the separating brake of high-voltage switch contact, closing time and switching-on resistance contact.
5. test method according to claim 4, it is characterised in that：The test of the pre-inserted angle of incidence of switching-on resistance contact
Method is as follows：
According to the equivalent circuit of high-voltage switch contact DL it is found that when high-voltage switch gear is in open position, that is, K1 and K2 and disconnects,
The voltage value at resistance R1 both ends is U01, reflect on the test equipment computer according to Ohm's law, calculate on resistance R1
Current value be I01= U01/R1；When switching-on resistance contact pre-inserted occurs, that is, when corresponding to contact K1 closures in equivalent circuit,
The voltage value at resistance R1 both ends is U '01, reflect on test equipment computer according to Ohm's law, calculate the electricity on resistance R1
Flow valuve is I '01= U′01/R1；When main contact K2 is closed in equivalent circuit, the voltage value at resistance R1 both ends is U "01, reflection arrives
According to Ohm's law on test equipment computer, it is I " to calculate the current value on resistance R101= U″01/R1；
High-voltage switch gear is enabled to do feed motion i.e. closing coil to charge, time point is T1 to record this moment, real with season A/D sample circuits
When to measure the voltage value at resistance R1 both ends be U01, when the voltage value for detecting resistance R1 both ends changes as U '01When, record
Time point is T2 this moment；
The voltage value for continuing detection resistance R1 both ends changes as U "01When, time point is T3 to record this moment；
By calculating T3 the corresponding pre-inserted angle of incidence of switching-on resistance contact is obtained with the time difference of T2.
6. test method according to claim 4, it is characterised in that：Combined floodgate, the opening time of the high-voltage switch contact
Test method it is as follows：
Closing time is tested：According to the equivalent circuit of high-voltage switch contact DL it is found that when high-voltage switch gear is in open position, that is, K1
When being disconnected with K2, the voltage value at resistance R1 both ends is U01, reflect on test equipment computer according to Ohm's law, calculate
Current value on resistance R1 is I01= U01/R1；When main contact combined floodgate occurs, that is, correspond to main contact K2 in equivalent circuit and be closed,
The voltage value at resistance R1 both ends is U "01, reflect on test equipment computer according to Ohm's law, calculate the electricity on resistance R1
Flow valuve is I "01= U″01/R1；
High-voltage switch gear is enabled to do feed motion i.e. closing coil to charge, time point is T1 to record this moment, real with season A/D sample circuits
When measure the voltage value at resistance R1 both ends, when the voltage value for detecting resistance R1 both ends changes as U "01When, when recording this moment
Between point for T3, obtain the closing time of corresponding high-voltage switch contact with the time difference of T1 by calculating T3；
Opening time is tested：According to the equivalent circuit of high-voltage switch contact DL it is found that when high-voltage switch gear is in closing position, that is, K1
When being closed with K2, the voltage value at resistance R1 both ends is U "01, reflect on test equipment computer according to Ohm's law, calculate
The current value gone out on resistance R1 is I "01= U″01/R1；When main contact separating brake occurs, that is, correspond to switching-on resistance in equivalent circuit
When contact K1 and main contact K2 are disconnected, the voltage value at resistance R1 both ends is U01, reflect on test equipment computer according to Europe
Nurse law, it is I to calculate the current value on resistance R101= U01/R1；
High-voltage switch gear is enabled to do separating brake action i.e. switching winding to charge, time point is T1 ' to record this moment, with season A/D sample circuits
The voltage value at resistance R1 both ends is measured in real time, when the voltage value for detecting resistance R1 both ends changes as U01When, record is this moment
Time point is T2 ', and the opening time of corresponding high-voltage switch contact is obtained with the time difference of T1 ' by calculating T2 '.
7. test method according to claim 4, it is characterised in that：The survey of the switching-on resistance value of the switching-on resistance contact
Method for testing is as follows：
In the case where high-voltage switch gear is in open position, both sides disconnecting link 1G, 2G ground state, measured in real time using A/D sample circuits
The voltage value at resistance R1 both ends is U01, the voltage value at AC power V1 both ends is U02, resistance at this time is calculated according to Ohm's law
Current value on R1 is I01= U01/ R1, and then obtain high-voltage switch gear and be under open position, both sides disconnecting link 1G, 2G ground state
Equiva lent impedance, the equiva lent impedance be Z1=(U02- U01)/ I01；
After contact K1 in the equivalent circuit of high-voltage switch contact DL is closed, A/D sample circuits measure resistance R1 both ends again
Voltage value is U '01, the voltage value at AC power V1 both ends is U '02, it is I ' to calculate the current value on resistance R101= U′01/ R1, into
And obtain under contact K1 closed states, the equiva lent impedance after equiva lent impedance Z1 and switching-on resistance R parallel connections is Z2=(U '02- U
′01)/ I′01, according to 1/Z2=1/Z1+1/R, the resistance value for calculating switching-on resistance R is R=Z1 × Z2/ (Z1-Z2).
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| CN204575811U (en) * | 2015-04-07 | 2015-08-19 | 石家庄汉迪电子仪器有限公司 | A kind of test macro of high-voltage switch contact |
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Effective date of registration: 20181127 Address after: 050035 22 Floor, Block B, Runjiang Huigu Building, 95 Qilian Street, Shijiazhuang High-tech Zone, Hebei Province Patentee after: SHIJIAZHUANG HANDY TECHNOLOGY CO., LTD. Address before: 050011 8th Floor, A2 Block, Ark in the Era of 342 Heping East Road, Shijiazhuang City, Hebei Province Patentee before: Shijiazhuang Han Di Electron equipment Co., Ltd |