CN105717361B - A kind of method of capacitive reactance and capacitance to earth between measurement line - Google Patents
A kind of method of capacitive reactance and capacitance to earth between measurement line Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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Abstract
A kind of test connection circuit measured for line parameter circuit value and its measuring method are solved and are measured in existing measurement method using the technical issues of larger flexibility of three-phase alien frequencies power volume is insufficient, test efficiency is low, especially suitable for grid power transmission circuit parameter measurement.The present invention uses single-phase alien frequencies power supply as external power supply, simultaneously circuit structure is formed using voltage transformer pt 1, PT2, PT3, great current mutual inductor CT1, CT2, CT3, small micro-current mutual inductor CT4, CT5, CT6 and 12 A.C. contactor K1 K12,12 contactors are under external logic control, the test connection switching needed for total Test process can be completed, without manual intervention.
Description
The application is 201510139743.1 divisional application, and parent application day is 2015-03-27.
Technical field
The invention belongs to power measurement technical field, more particularly to a kind of test connection electricity measured for line parameter circuit value
Road and its measuring method.
Background technology
Transmission line of electricity is the important component of electric system, with the high speed development of power grid, creates ultra-high-tension power transmission line
More and more, route parameter needs are measured to be distributed as computing system short circuit current, relay protection setting, reckoning trend
With the foundation of the selection method of operation etc..The acquisition of transmission line parameter can also be surveyed by theoretical calculation by field test
It is fixed.But due to calculating deviation caused by condition hypothesis various in theoretical calculation, theoretical calculation cannot replace field test to measure.Profit
The conventional method that line parameter circuit value measure is carried out with field test is to three-phase line Injection Current, using measuring by external power supply
Voltage and current calculate obtain respective lines parameter value.Line parameter circuit value test result is influenced to reduce external electromagnetic interference,
It is carried out using the three-phase alien frequencies power supply with power frequency 50Hz with notable difference (such as 40Hz and 60Hz) as external drive power supply
Line parameter circuit value test can effectively avoid the influence for the electromagnetic induction that other circuit power currents generate, and this method is wide so as to obtain
General application.
A kind of ultra-high-tension power transmission line power frequency parameter test is disclosed in Chinese patent literature 203630241U to connect with test
Line switches integrated apparatus, by the way that contactor, voltage transformer and current transformer are connected with three phase mains and host computer,
Realize the purpose for ensureing safety and automatically switching wiring.But due to three-phase alien frequencies power supply being used to carry out parameter survey in the program
Examination, and three-phase alien frequencies power supply in addition to externally non-power-frequency current is provided also needs that the amplitude encountered in on-the-spot test can be received larger
Line-frequency induction electric current causes its rated capacity larger, larger so as to cause its volume, and flexibility is insufficient.Simultaneously as circuit is joined
The diversity of number test events, the connection between each meter is complicated, need to change when measuring different parameters and measure wiring and instrument connects
Line, testing experiment is cumbersome, and test efficiency is low.
Invention content
For this purpose, the technical problems to be solved by the invention be in existing measurement method measure using alien frequencies power volume compared with
The problem of big flexibility is insufficient, test efficiency is low, so as to propose a kind of test connection circuit measured for line parameter circuit value and its
Measuring method.
In order to solve the above technical problems, the test connection circuit measured for line parameter circuit value of the present invention includes：It is single-phase different
Frequency power, the first end of the single-phase alien frequencies power supply connect the A phases of circuit to be measured by Current Transmit 1 with controllable switch K1
Terminals；The first end of the single-phase alien frequencies power supply is also connected with one end of controllable switch K11, and the controllable switch K11's is another
End is connect respectively by the input terminal of controllable switch K8, K9, K10 respectively with Current Transmit 4, CT5, CT6, current transformer
The output terminal of CT4 is connected line end by the A of controllable switch K12 connections circuit to be measured, the output of the Current Transmit 5, CT6
The B that end connects circuit to be measured respectively connects line end and C connects line end.
The second end of the single-phase alien frequencies power supply respectively by controllable switch K5, K6, K7 connect Current Transmit 4,
The input terminal of CT5, CT6.
The second end of the single-phase alien frequencies power supply also connects Current Transmit 2, CT3 by controllable switch K2, K3 respectively
Input terminal, the Current Transmit 2, CT3 output terminal connect the B of circuit to be measured respectively and connect line end and C connects line end.
Voltage transformer pt 1 is provided between the first end and second end of the single-phase alien frequencies power supply, described single-phase different
The B of the second end of frequency power and circuit to be measured, which connects, is provided with voltage transformer pt 2 between line end, in the single-phase alien frequencies power supply
Second end and the C of circuit to be measured connect and be provided with voltage transformer pt 3 between line end.
Preferably, the first end of the single-phase alien frequencies power supply is grounded by controllable switch K4.
Preferably, the controllable switch K1-K12 is A.C. contactor, the A.C. contactor and test connection controller
Connection.
Preferably, the Current Transmit 1, CT2, CT3 are great current mutual inductor, for measuring sense larger in circuit
Property electric current；The Current Transmit 4, CT5, CT6 are small current mutual inductor, for measuring the smaller capacity current of amplitude.
Preferably, described controllable switch K1, K5, K6, K7, K11, K12 are normally closed switch.
Preferably, described controllable switch K2, K3, K4, K8, K9, K10 are normal open switch.
The present invention also provides a kind of line parameter circuit value measuring method of test connection circuit, including measuring line impedance and induction reactance
Resistance, step are as follows：
S11：Controllable switch K1, K2, K3, K4, K5, K6, K7, K11, K12 are closed, controllable switch K8, K9, K10 are broken
It opens；
S12：Controllable switch K5, K6, K7 are disconnected, controllable switch K2, K3 are disconnected, boosting utilizes voltage transformer
PT1, PT2, PT3 measure voltage value, and Current Transformer CT1 measures current value, is depressured back to zero；
S13：Controllable switch K2 is closed, is boosted, voltage value is measured with voltage transformer PT1, PT3, utilizes Current Mutual Inductance
Device CT1, CT2 measure current value；
S14：Controllable switch K3 is closed, is boosted, voltage value is measured with voltage transformer PT1, utilizes current transformer
CT1, CT2, CT3 measure current value；
S15：It restPoses.
The present invention also provides a kind of line parameter circuit value measuring method of test connection circuit, including capacitive reactance between measurement line and over the ground
Capacitive reactance, step are as follows：
S21：By controllable switch K1, K2, K3, K4, K5, K6, K7 are disconnected, and controllable switch K8, K9, K10 are closed；Pressurization,
Line current is measured using Current Transmit 4, CT5, CT6, voltage transformer pt 1, PT2, PT3 measure voltage；
S22：Controllable switch K6 is closed, K9 is disconnected；Pressurization measures line electricity using Current Transmit 4, CT5, CT6
Stream, voltage transformer pt 1, PT2, PT3 measure voltage, are depressured back to zero；
S23：Controllable switch K7 is closed, K10 is disconnected；Pressurization measures line electricity using Current Transmit 4, CT5, CT6
Stream, voltage transformer pt 1, PT2, PT3 measure voltage, are depressured back to zero；
S24:Controllable switch K1, K2, K3, K4, K5, K6, K7, K11, K12 are closed, controllable switch K8, K9, K10 are broken
It opens.
The line parameter circuit value measuring method of test connection circuit of the present invention, the controllable switch K1-K12 pass through test connection control
Device processed automatically switches.
Preferably, the test connection controller is high-speed microprocessor or DSP.
The above technical solution of the present invention has the following advantages over the prior art：
Provided by the present invention for the test connection circuit that line parameter circuit value measures, measure wiring and instrument wiring is once complete
Into, using external logic automatic control relay, wiring construction is varied without during different parameters so as to measure, testing experiment letter
Single, test efficiency is high.External power supply is solved using single-phase alien frequencies power supply and is measured in existing measurement method using three-phase alien frequencies electricity
The technical issues of larger flexibility of volume source is insufficient, test efficiency is low.
The line parameter circuit value measuring method of test connection circuit provided by the invention is realized using wiring test controller and docked
The control of tentaculum, without any manual intervention, is not required to change so as to be automatically performed the switching of test connection when measuring different parameters
Become and measure wiring and instrument wiring, testing experiment is simple, and test efficiency is high.External power supply use single-phase alien frequencies power supply, volume compared with
Small, flexibility is high, especially suitable for grid power transmission circuit parameter measurement.
Description of the drawings
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein：
Fig. 1 is the test connection circuit diagram measured for line parameter circuit value of one embodiment of the invention.
Specific embodiment
The embodiment of the present invention is illustrated below in conjunction with attached drawing, it should be understood that preferred embodiment described herein
It is merely to illustrate and explain the present invention, is not intended to limit the present invention.
Embodiment 1：
The present embodiment provides a kind of test connection circuit measured for line parameter circuit value, as shown in Figure 1, in figure, dotted line frame
The leading-in end of the interior test connection circuit for the present invention, wherein A, B, C expression three-phase overhead transmission line, CT expressions current transformer,
PT represents voltage transformer, represents contactor with K, is used as controllable switch.AC represents the external single-phase alien frequencies power supply accessed.
The test connection circuit measured for line parameter circuit value in the present embodiment includes single-phase alien frequencies power supply AC, this is single-phase different
There are two output terminal, respectively first end and second end, output AC power sources for frequency power tool.The first of the single-phase alien frequencies power supply
The A that end connects circuit to be measured by Current Transmit 1 with controllable switch K1 connects line end；The first of the single-phase alien frequencies power supply
End is also connected with one end of controllable switch K11, and the other end of the controllable switch K11 is divided respectively by controllable switch K8, K9, K10
Input terminal not with Current Transmit 4, CT5, CT6 is connect, and the output terminal of Current Transmit 4 is connected by controllable switch K12
The A on reception survey line road connects line end, the Current Transmit 5, CT6 output terminal connect the B phase connections of circuit to be measured respectively
End and C connect line end.
The second end of the single-phase alien frequencies power supply respectively by controllable switch K5, K6, K7 connect Current Transmit 4,
The input terminal of CT5, CT6.
The second end of the single-phase alien frequencies power supply also connects Current Transmit 2, CT3 by controllable switch K2, K3 respectively
Input terminal, the Current Transmit 2, CT3 output terminal connect the B of circuit to be measured respectively and connect line end and C connects line end.
Voltage transformer pt 1 is provided between the first end and second end of the single-phase alien frequencies power supply, described single-phase different
The B of the second end of frequency power and circuit to be measured, which connects, is provided with voltage transformer pt 2 between line end, in the single-phase alien frequencies power supply
Second end and the C of circuit to be measured connect and be provided with voltage transformer pt 3 between line end.
The first end of the single-phase alien frequencies power supply is grounded by controllable switch K4.For the personnel of improving and the safety of equipment,
Overhead transmission line at least side is in ground state.
The controllable switch K1-K12 is A.C. contactor, and the A.C. contactor is connect with wiring test controller.This
The wiring test controller at place can control the automatic switchover of above-mentioned K1-K12, without artificially controlling.
The Current Transmit 1, CT2, CT3 are great current mutual inductor, for measuring inductance current larger in circuit；
The Current Transmit 4, CT5, CT6 are small current mutual inductor, for measuring the smaller capacity current of amplitude.
In the present embodiment, controllable switch K1, K5, K6, K7, K11, K12 selected as normally closed switch.The controllable switch
K2, K3, K4, K8, K9, K10 are normal open switch.
Provided by the present invention for the test connection circuit that line parameter circuit value measures, altogether using 3 voltage transformer pts, 3
Great current mutual inductor CT, micro-current mutual inductor CT 3 small, 12 contactors, measure wiring and instrument wiring is once completed, profit
With external logic automatic control relay, wiring construction is varied without during different parameters so as to measure, testing experiment is simple, examination
It tests efficient.External power supply, which solves to measure in existing measurement method using single-phase alien frequencies power supply, uses three-phase alien frequencies power volume
The technical issues of larger flexibility is insufficient, test efficiency is low.It also solves simultaneously repeatedly artificial using single-phase alien frequencies power supply needs
The problem of wiring and repeatedly switching, primary connection control switch to automatically switch, carry out parameter measurement by controller.
Embodiment 2：
The present embodiment provides a kind of line parameter circuit value measuring method of test connection circuit, using single-phase alien frequencies power supply by dividing
Portion measures each component of line parameter circuit value, then to the method for each component synthesis, theoretically can also obtain and three-phase alien frequencies power measurement
Equal measurement accuracy.The present invention utilizes control of the contactor in test connection controller, and test connection controller can utilize height
Fast microcontroller or DSP output relay logical actions, are automatically performed the switching of test connection, without any manual intervention,
Realize that automatic branch measures.
A kind of the step of single-phase alien frequencies power supply is used to complete three-phase overhead transmission line parameter testing for：First, circuit offside end
A phases, B phases and C phase short circuit groundings complete the measurement of line resistance and induction reactance；Second is that circuit offside terminal open circuit, head end connects outer apply
Power supply, into row line capacitance measurement.
It in the measurement of first step line resistance and induction reactance, at least needs to carry out the switching of 3 test connections, so as to obtain pair
Line voltage distribution or electric current under the conditions of answering.It is A phase lines under the short circuit of B and C phase line offsides end, head end open-circuit condition first
Apply voltage, measure the induced voltage of A phase currents and B and C phase lines, obtain first group of design conditions.Then it is to maintain connection
Motionless in the power supply of A phases, B phase line ground short circuits remeasure three-phase voltage and electric current, obtain second group of design conditions；The
Third, A, B phase connection remain stationary as, C phase line ground short circuits remeasure three-phase voltage and electric current, show that third group calculates item
Part.
In the measurement of second step circuit capacitive reactance, it is also desirable at least 3 test connection switchings.In circuit offside grounding switch
Under the premise of disconnection, same voltage is applied to three-phase line in head end first, measures three-phase line voltage and electric current, obtains first
Group design conditions；Then, it keeps other conditions constant, the connection of C phase lines and power supply is disconnected, by its short circuit grounding.Again it surveys
Three-phase line voltage and electric current are measured, obtains second group of design conditions；Last A phases are remained stationary as with C phase connections, disconnect B phases and electricity
The connection in source, by its ground short circuit.Three-phase line voltage and electric current are remeasured, third group design conditions can be obtained.By upper
The wiring switching and corresponding experiment for stating 26 small steps of big step can obtain the initial data calculated needed for three-phase line parameter.
But above-mentioned handoff procedure is cumbersome, long the time required to manually completing above-mentioned wiring switching, efficiency is low.Based on this
A kind of line parameter circuit value measuring method of test connection circuit is provided in embodiment, in the test connection circuit in embodiment 1.
As shown in Figure 1, the original state of controllable switch is set as controllable switch K1, K11, K12 closure in automatic switch-over circuit, controllably open
It closes K2, K3, K4 to be closed, controllable switch K5, K6, K7 are closed, and controllable switch K8, K9, K10 are disconnected.
Line impedance and induction reactance resistance measurement, step are as follows：
S11：Controllable switch K1, K2, K3, K4, K5, K6, K7, K11, K12 are closed, controllable switch K8, K9, K10 are broken
It opens.
S12：Controllable switch K5, K6, K7 are disconnected, controllable switch K2, K3 are disconnected, boosting utilizes voltage transformer
PT1, PT2, PT3 measure voltage value, and Current Transformer CT1 measures current value, is depressured back to zero；
S13：Controllable switch K2 is closed, is boosted, voltage value is measured with voltage transformer PT1, PT3, utilizes Current Mutual Inductance
Device CT1, CT2 measure current value；
S14：Controllable switch K3 is closed, is boosted, voltage value is measured with voltage transformer PT1, utilizes current transformer
CT1, CT2, CT3 measure current value；
S15：It restPoses.That is controllable switch K1, K11, K12 is closed, and controllable switch K2, K3, K4 are closed, and are controllably opened
It closes K5, K6, K7 to be closed, controllable switch K8, K9, K10 are disconnected.
Capacitive reactance and capacitance to earth measure between line, and step is as follows：
S21：By controllable switch K1, K2, K3, K4, K5, K6, K7 are disconnected, and controllable switch K8, K9, K10 are closed；Pressurization,
Line current is measured using Current Transmit 4, CT5, CT6, voltage transformer pt 1, PT2, PT3 measure voltage.
S22：Controllable switch K6 is closed, K9 is disconnected；Pressurization measures line electricity using Current Transmit 4, CT5, CT6
Stream, voltage transformer pt 1, PT2, PT3 measure voltage, are depressured back to zero
S23：Controllable switch K7 is closed, K10 is disconnected；Pressurization measures line electricity using Current Transmit 4, CT5, CT6
Stream, voltage transformer pt 1, PT2, PT3 measure voltage, are depressured back to zero.
S24:Controllable switch K1, K2, K3, K4, K5, K6, K7, K11, K12 are closed, controllable switch K8, K9, K10 are broken
It opens, restPoses.
The initial data calculated needed for three-phase line parameter can be obtained by above-mentioned six groups of design conditions.It is above-mentioned controllably to open
It closes K1-K12 and A.C. contactor may be selected, cut-off to automatically control it by wiring test controller, without manual wiring and cut
It changes, so as to reduce to the requirement of manually operated technology, improves test speed and reliability.
The line parameter circuit value measuring method of test connection circuit provided in this embodiment utilizes the realization pair of wiring test controller
The control of contactor, without any manual intervention, is not required to so as to be automatically performed the switching of test connection when measuring different parameters
Change and measure wiring and instrument wiring, simplify testing experiment, effectively shorten test period, improve test efficiency.It is external
Power supply uses single-phase alien frequencies power supply, and small volume, flexibility is high, especially suitable for grid power transmission circuit parameter measurement, effectively carries
Height carries out the efficiency and reliability of overhead transmission line parameter measurement using single-phase alien frequencies power supply, has stronger application and popularizations value.
Obviously, the above embodiments are merely examples for clarifying the description, and is not intended to limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus extended out or
Among changing still in the protection domain of the invention.
Claims (8)
1. a kind of method of capacitive reactance and capacitance to earth between measurement line, the test connection circuit used include：Single-phase alien frequencies power supply,
The A that the first end of the single-phase alien frequencies power supply connects circuit to be measured by Current Transmit 1 with controllable switch K1 connects line end；
The first end of the single-phase alien frequencies power supply is also connected with one end of controllable switch K11, the other end point of the controllable switch K11
It is not connect by the input terminal of controllable switch K8, K9, K10 respectively with Current Transmit 4, CT5, CT6, Current Transmit 4
Output terminal connected line end by the A of controllable switch K12 connections circuit to be measured, the Current Transmit 5, CT6 output terminal
The B for connecting circuit to be measured respectively connects line end and C connects line end；The first end of the single-phase alien frequencies power supply passes through controllable switch K4
Ground connection；
The second end of the single-phase alien frequencies power supply connects Current Transmit 4, CT5, CT6 by controllable switch K5, K6, K7 respectively
Input terminal；
The second end of the single-phase alien frequencies power supply also respectively by controllable switch K2, K3 connect Current Transmit 2, CT3 it is defeated
Enter end, the Current Transmit 2, CT3 output terminal connect the B of circuit to be measured respectively and connect line end and C connects line end；
Voltage transformer pt 1 is provided between the first end and second end of the single-phase alien frequencies power supply, in the single-phase alien frequencies electricity
The B of the second end in source and circuit to be measured, which connects, is provided with voltage transformer pt 2 between line end, the of the single-phase alien frequencies power supply
The C of two ends and circuit to be measured, which connects, is provided with voltage transformer pt 3 between line end；
It is characterized in that, that the method comprising the steps of is as follows：
S21：By controllable switch K1, K2, K3, K4, K5, K6, K7 are disconnected, and controllable switch K8, K9, K10 are closed；Pressurization utilizes
Current Transmit 4, CT5, CT6 measure line current, and voltage transformer pt 1, PT2, PT3 measure voltage；
S22：Controllable switch K6 is closed, K9 is disconnected；Pressurization measures line current, electricity using Current Transmit 4, CT5, CT6
Mutual inductor PT1, PT2, PT3 is pressed to measure voltage, is depressured back to zero；
S23：Controllable switch K7 is closed, K10 is disconnected；Pressurization measures line current using Current Transmit 4, CT5, CT6,
Voltage transformer pt 1, PT2, PT3 measure voltage, are depressured back to zero；
S24:Controllable switch K1, K2, K3, K4, K5, K6, K7, K11, K12 are closed, controllable switch K8, K9, K10 are disconnected.
2. according to the method described in claim 1, it is characterized in that, the controllable switch K1-K12 be A.C. contactor, it is described
A.C. contactor is connect with test connection controller.
3. according to the method described in claim 1, it is characterized in that, the Current Transmit 1, CT2, CT3 are that high current is mutual
Sensor, for measuring inductance current larger in circuit.
4. according to the method described in claim 1, it is characterized in that, the Current Transmit 4, CT5, CT6 are that low current is mutual
Sensor, for measuring the smaller capacity current of amplitude.
5. according to the method described in claim 1, it is characterized in that, described controllable switch K1, K5, K6, K7, K11, K12 are normal
Make and break is closed.
6. according to the method described in claim 1, it is characterized in that, described controllable switch K2, K3, K4, K8, K9, K10 are normally opened
Switch.
7. according to claim 1-6 any one of them methods, which is characterized in that the controllable switch K1-K12 is connect by experiment
Lane controller automatically switches.
8. the method according to the description of claim 7 is characterized in that the test connection controller is high-speed microprocessor or DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610060261.1A CN105717361B (en) | 2015-03-27 | 2015-03-27 | A kind of method of capacitive reactance and capacitance to earth between measurement line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610060261.1A CN105717361B (en) | 2015-03-27 | 2015-03-27 | A kind of method of capacitive reactance and capacitance to earth between measurement line |
| CN201510139743.1A CN104808021B (en) | 2015-03-27 | 2015-03-27 | A kind of test connection circuit measured for line parameter circuit value and measuring method thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510139743.1A Division CN104808021B (en) | 2015-03-27 | 2015-03-27 | A kind of test connection circuit measured for line parameter circuit value and measuring method thereof |
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| CN105717361A CN105717361A (en) | 2016-06-29 |
| CN105717361B true CN105717361B (en) | 2018-06-12 |
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