CN101424715B - Power frequency parameter measuring set for high-pressure power transmission line - Google Patents
Power frequency parameter measuring set for high-pressure power transmission line Download PDFInfo
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- CN101424715B CN101424715B CN2008101829030A CN200810182903A CN101424715B CN 101424715 B CN101424715 B CN 101424715B CN 2008101829030 A CN2008101829030 A CN 2008101829030A CN 200810182903 A CN200810182903 A CN 200810182903A CN 101424715 B CN101424715 B CN 101424715B
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Abstract
The invention relates to a power frequency parameter measuring device of a high-voltage transmission line, which comprises a main controller and a DC resistance testing unit, wherein the positive output end of a DC signal generator is connected with a positive pole of a current sensor, the negative output end of the DC signal generator is connected with the ground, the negative pole of the current sensor is respectively connected with a first voltage sensor, a second voltage sensor and a third voltage sensor through a first contactor, a second contactor and a third contactor, and the negative poles of the first voltage sensor, the second voltage sensor and the third voltage sensor are respectively used as an A phrase testing hole, a B phrase testing hole and a C phrase testing hole; the main controller is used for sending a control command to control the switching of the contactor, the voltage and current signals output by the DC resistance testing unit are acquired, and a three-phrase DC resistance value of a measured line is obtained through calculation. The power frequency parameter measuring device of a high-voltage transmission line is adopted to measure DC resistance.
Description
Technical field
The present invention relates to the ultra-high-tension power transmission line field, particularly relate to a kind of power frequency parameter measuring set for high-pressure power transmission line.
Background technology
Before ultra-high-tension power transmission line puts into operation,, need measure the circuit power frequency parameter of ultra-high-tension power transmission line for the trend of calculating whole network system distributes, sets the corresponding protection definite value for circuit.
The circuit power frequency parameter of described ultra-high-tension power transmission line mainly comprises: mutual inductive impedance between the direct current resistance of transmission line of electricity, positive sequence impedance, zero sequence impedance, positive sequence electric capacity and zero sequence electric capacity and double-circuit line and coupling capacitance etc.
General at present employing parameter measurement instrument is measured the power frequency parameter of ultra-high-tension power transmission line.Described parameter measurement instrument adopts integrated design, can measure power frequency parameters such as mutual inductive impedance between positive sequence impedance, zero sequence impedance, positive sequence electric capacity and the zero sequence electric capacity and the double-circuit line of transmission line of electricity and coupling capacitance easily and fast, accurately, instrument and equipments such as the necessary experiment power supply of parameter measurement, measurement instrument have been simplified, for site test provides certain convenience.
When transmission line of electricity was carried out power frequency parameter measuring, whether the direct current resistance of measuring circuit was to meet the requirements for the connection situation of checking transmission line of electricity and wire quality.Therefore, the direct current resistance of measurement transmission line of electricity has certain importance.
But existing parameter measurement instrument does not all possess the direct current resistance test function.During the in-site measurement power frequency parameter, need external dc power supply, use independent instrument for measuring DC resistance table to test.
Referring to Fig. 1, be prior art power line DC resistance test wiring diagram.
In the prior art, to test line 1a external dc resistance test loop.Test loop comprises: voltage table 1b, reometer 1c, electric capacity 1d, direct supply 1e and isolating switch 1f.
Voltage table 1b one termination reometer 1c.Another termination capacitor 1d and positive pole direct supply 1e of reometer 1c.The negative pole of the other end of electric capacity 1d and direct supply 1e together takes back the other end of voltage table 1b through isolating switch 1f.
When direct current resistance is measured, earlier with test line 1a head end three-phase ground connection, terminal three-phase shortcircuit.Voltage table 1b is connected between head end A phase and the head end B phase, removes head end three-phase ground connection, measure the magnitude of voltage U at AB two ends
Ab, current value I
Ab, and circuit two ends temperature at that time.
And then with test line 1a head end three-phase ground connection, terminal three-phase shortcircuit.Voltage table 1b is connected between head end B phase and the head end C phase, removes head end three-phase ground connection, measure the magnitude of voltage U at BC two ends
Bc, current value I
Ab, and circuit two ends temperature at that time.
Repeat above-mentioned steps, measure the magnitude of voltage U at CA two ends
Ca, current value I
Ca, and circuit two ends temperature at that time.
Calculate the resistance in series of every two-phase circuit:
R
ab＝U
ab/I
ab (1)
R
bc＝U
bc/I
bc (2)
R
ca＝U
ca/I
ca (3)
Calculate the dc resistance of every phase again according to resistance in series:
R
a＝(R
ab+R
ca-R
bc)/2 (4)
R
b＝(R
ab+R
bc-R
ac)/2 (5)
t
c＝(R
ac+R
bc-R
ab)/2 (6)
At last, according to when test head, terminal temperature, the dc resistance the when dc resistance that test is obtained is converted to 20 ℃.
From the above,, to the power line DC resistance test time, need external dc power supply, use independent direct current resistance test loop to test because the prior art parameter measurement instrument does not possess the direct current resistance measurement function.
Simultaneously, when prior art is measured direct current resistance, need constantly to high-tension line first and last end carry out wiring, the operation of taking out stitches.Because the existence of ultra-high-tension power transmission line line-frequency induction voltage, frequently high-tension line is carried out by operating personnel that craft is torn open, wiring, no matter the personal safety to the tester still is the safety of testing apparatus, all exist very big must be dangerous.
Therefore, how realizing the measurement of ultra-high-tension power transmission line parameter measuring apparatus to direct current resistance, is the eager technical issues that need to address in this area.
Summary of the invention
Technical matters to be solved by this invention provides a kind of power frequency parameter measuring set for high-pressure power transmission line, can realize the measurement to power line DC resistance.
For solving the problems of the technologies described above, the invention provides a kind of power frequency parameter measuring set for high-pressure power transmission line, described device comprises: master controller and direct current resistance test cell;
Described direct current resistance test cell comprises: direct-flow signal generator, current sensor, first contactor, second contactor, the 3rd contactor and first voltage sensor, second voltage sensor, tertiary voltage sensor;
The positive output termination current sensor positive pole of described direct-flow signal generator, negative output terminal ground connection; Described current sensor negative pole connects the positive pole of first voltage sensor, the positive pole of second voltage sensor and the positive pole of tertiary voltage sensor by first contactor, second contactor, the 3rd contactor respectively; The negative pole of first voltage sensor, second voltage sensor and tertiary voltage sensor is respectively A, B, C phase test port;
Described device also comprises: driving circuit and sample circuit;
Described driving circuit is used for according to the steering order that is received from master controller, sends the corresponding driving signal to the direct current resistance test cell, triggers corresponding contactor;
Described sample circuit is used to gather voltage, the current analog signal that the direct current resistance test cell is measured, and is converted into digital signal, is sent to master controller;
Described master controller is used for sending controling instruction, the break-make of control contactor, and obtain voltage, the current signal of the output of direct current resistance test cell, by calculating the three-phase dc resistance value of test line.
Preferably, described direct-flow signal generator is a rectifier bridge; The positive and negative input termination AC power of described rectifier bridge, the positive pole of its positive output termination current sensor, its negative output terminal ground connection; Described rectifier bridge is converted into direct current signal with the industrial frequency AC signal, exports the direct current resistance test cell to.
Preferably, described rectifier bridge comprises first diode, second diode, the 3rd diode and the 4th diode;
The negative electrode of first diode connects the anode of second diode, and the negative electrode of second diode connects the negative electrode of the 3rd diode, and the anode of the 3rd diode connects the negative electrode of the 4th diode, and the anode of the 4th diode connects the anode of first diode;
The common port of first diode and second diode is the positive input terminal of rectifier bridge, and the common port of the 3rd diode and the 4th diode is the negative input end of rectifier bridge; The common port of second diode and the 3rd diode is the positive output end of rectifier bridge; The common port of first diode and the 4th diode is the negative output terminal of rectifier bridge.
Preferably, described first contactor, second contactor, the 3rd contactor are relay;
The negative pole of the input termination current sensor of described first relay, second relay, the 3rd relay, the normally opened contact of described first relay, second relay, the 3rd relay connects the positive pole of first voltage sensor, second voltage sensor, tertiary voltage sensor respectively, and the equal sky of its normally closed contact connects.
Preferably, described device also comprises isolating switch; Described isolating switch one termination AC power, the positive input terminal of another termination master controller and rectifier bridge.
Preferably, described device also comprises the 4th relay; The input end of described the 4th relay and normally opened contact are connected on respectively between the positive input terminal of isolating switch and rectifier bridge, and its normally closed contact sky connects.
Preferably, described device also comprises power-supply filter; Described power-supply filter series connection is between isolating switch and master controller.
Preferably, described direct current resistance test cell also comprises voltage stabilizer; Described voltage stabilizer also is connected between the positive and negative output terminal of direct current signal generation unit.
Preferably, described direct current resistance test cell also comprises wave filter; Described wave filter also is connected between the positive and negative output terminal of direct current signal generation unit.
Preferably, described device also comprises display screen; Described display screen links to each other with master controller, is used to show that master controller calculates the three-phase dc resistance value of test line.
When adopting power frequency parameter measuring set for high-pressure power transmission line of the present invention to carry out parameter measurement, at first the three-phase of test line is connected on the test port of device correspondence respectively.Direct-flow signal generator produces direct current signal, exports the direct current resistance test cell to.Master controller sends the control corresponding instruction, the break-make of each contactor in the control direct current resistance test cell, measure test line voltage in three phases value and current value respectively, and described magnitude of voltage and current value are sent to master controller calculate, obtain the dc resistance of test line three-phase respectively.
Device of the present invention by introduce direct-flow signal generator in traditional parameter measurement instrument, directly produces direct current signal, carries out the direct current resistance of test line and measures, and makes parameter measuring apparatus possess the function of measuring direct current resistance.
Simultaneously, device of the present invention only needs the three-phase of test line is linked to each other with the corresponding test port of described device respectively before measurement.Compared with prior art, device of the present invention only needs primary connection just can realize test to the ultra-high-tension power transmission line direct current resistance, avoided frequent in the prior art and torn open, the wiring operation, effectively guaranteed tester's the personal safety and the safety of testing apparatus.
Description of drawings
Fig. 1 is a prior art power line DC resistance test wiring diagram;
Fig. 2 is the described power frequency parameter measuring set for high-pressure power transmission line structural drawing of first embodiment of the invention;
Fig. 3 is the described power frequency parameter measuring set for high-pressure power transmission line structural drawing of second embodiment of the invention;
Fig. 4 is that the described power frequency parameter measuring set for high-pressure power transmission line of second embodiment of the invention is measured the direct current resistance wiring diagram;
Fig. 5 is the described power frequency parameter measuring set for high-pressure power transmission line structural drawing of third embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Power frequency parameter measuring set for high-pressure power transmission line of the present invention, in traditional tester, added direct-flow signal generator, when carrying out parameter measurement, direct-flow signal generator produces direct current signal, master controller sends the control corresponding instruction, and the break-make of each contactor is measured test line voltage in three phases value and current value respectively in the control direct current resistance test cell, and described magnitude of voltage and current value are sent to master controller calculate, obtain the dc resistance of test line three-phase respectively.
With reference to Fig. 2, the described power frequency parameter measuring set for high-pressure power transmission line structural drawing of first embodiment of the invention.
Described device comprises: master controller 100 and direct current resistance test cell 200;
Direct current resistance test cell 200 comprises: direct-flow signal generator 2001, current sensor 2002, first contactor 2003, second contactor 2004, the 3rd contactor 2005 and first voltage sensor 2006, second voltage sensor 2007, tertiary voltage sensor 2008;
The positive pole of the positive output termination current sensor 2002 of direct-flow signal generator 2001, its negative output terminal ground connection.
The negative pole of current sensor 2002 connects the positive pole of first voltage sensor 2006 by first contactor 2003.The negative pole of current sensor 2002 connects the positive pole of second voltage sensor 2007 by second contactor 2004.The negative pole of current sensor 2002 connects the positive pole of tertiary voltage sensor 2008 by the 3rd contactor 2005.The negative pole of the negative pole of the negative pole of first voltage sensor 2006, second voltage sensor 2007, tertiary voltage sensor 2008 is respectively A, B, the C phase test port of measurement mechanism.
Master controller is used for sending controling instruction, the break-make of control contactor, and obtain voltage, the current signal of the output of direct current resistance test cell, by calculating the three-phase dc resistance value of test line.
Preferably, direct-flow signal generator 2001 can be direct supply E, and the output direct current signal is used for the direct current resistance test.
Generally, when not carrying out parameter measurement, first contactor 2003, second contactor 2004, the 3rd contactor 2005 all are in off-state.
When adopting described device to carry out parameter measurement, at first with A, the B of test line head end, A, B, the C phase test port that the C three-phase is connected on the device correspondence respectively, terminal three-phase short circuit.
Produce direct current signal by direct-flow signal generator 2001.Master controller sends the control corresponding instruction, and the break-make of each contactor is measured test line voltage in three phases value and current value respectively in the control direct current resistance test cell.
When first contactor 2003 was connected, first voltage sensor 2006 inserted the direct current resistance test loop, measures the magnitude of voltage U of test line A phase
AAnd current value I
AAfter measuring end, disconnect first contactor 2003.
When second contactor 2004 was connected, second voltage sensor 2007 inserted the direct current resistance test loop, measures the magnitude of voltage U of test line B phase
BAnd current value I
BAfter measuring end, disconnect second contactor 2004.
When the 3rd contactor 2005 was connected, tertiary voltage sensor 2008 inserted the direct current resistance test loop, measures the magnitude of voltage U of test line C phase
CAnd current value I
CAfter measuring end, disconnect the 3rd contactor 2005.
Above-mentioned each magnitude of voltage and current value are sent to master controller 100 calculate, obtain the dc resistance of test line three-phase respectively.
R
A＝U
A/I
A (7)
R
B＝U
B/I
B (8)
R
C＝U
C/I
C (9)
From the above, compared with prior art, device of the present invention, the dc resistance that calculates test line that can be easy need not make test process more succinct carrying out loaded down with trivial details derivation of equation process, has shortened the test duration greatly.
The embodiment of the invention one described device by introduce the direct current signal generation unit in traditional parameter measurement instrument, directly produces direct current signal, carries out the direct current resistance of test line and measures, and makes parameter measuring apparatus possess the function of measuring direct current resistance.
Simultaneously, device of the present invention only needs the three-phase of test line is linked to each other with the corresponding test port of described device respectively before measurement.Compared with prior art, device of the present invention only needs primary connection just can realize test to the ultra-high-tension power transmission line direct current resistance, avoided frequent in the prior art and torn open, the wiring operation, effectively guaranteed tester's the personal safety and the safety of testing apparatus.
In the embodiment of the invention two described devices, adopt rectifier bridge, the 220V industrial-frequency alternating current is converted into direct current signal, be used for the direct current resistance test as direct-flow signal generator.Simultaneously, adopt relay as the contactor in the direct current resistance test cell, described device further comprises driving circuit and sampling unit, the steering order that driving circuit issues according to master controller, send drive signal, trigger corresponding relays, measure the direct current resistance of each phase of test line.Gather the voltage and current value that the direct current resistance test cell is measured by sampling unit then, be back to master controller, calculate each phase dc resistance of test line by master controller.
With reference to Fig. 3, the described power frequency parameter measuring set for high-pressure power transmission line structural drawing of second embodiment of the invention.
Comprise among Fig. 3: isolating switch 1, power-supply filter 2, master controller 3, driving circuit 4, direct current resistance test cell 5 and sampling unit 6.
Isolating switch 1 one termination 220V power frequency ACs, another termination power-supply filter 2 and direct current resistance test cell 5.Power-supply filter 2 connects master controller 3.
Isolating switch 1 is a battery main switch, the control on/off.Isolating switch 1 external 220V power frequency AC.When closing isolating switch 1, power light is lighted, and master controller 3 starts.
Power-supply filter 2 is used for 220V power frequency electrofiltration ripple, eliminates the influence of supply harmonic to master controller 3.
Driving circuit 4 is used for according to the steering order that is received from master controller 3, sends the corresponding driving signal to direct current resistance test cell 5, triggers corresponding relay.
Sampling unit 6 is used to gather voltage, the current analog signal of direct current resistance test cell 5 outputs, is converted into digital signal, is sent to master controller 3.
Master controller 3 is used to send control corresponding and instructs to driving circuit 4, and receives voltage, current digital signal that sampling unit 6 collects, by calculating the three-phase dc resistance value of test line.
Direct current resistance test cell 5 comprises: the 4th relay K 4501, rectifier bridge 502, voltage stabilizer 503, wave filter 504, current sensor 505, first relay K 1506, second relay K 2507, the 3rd relay K 3508, the first voltage sensor V1509, the second voltage sensor V2510 and tertiary voltage sensor V3511.
The input end of the 4th relay K 4501 connects 220V power frequency AC positive pole by isolating switch 1, and its normally closed contact sky connects, and its normally opened contact connects the positive input terminal of rectifier bridge 502.
The common port A1 of D1 and D2 is the positive input terminal of rectifier bridge 502, and the common port A2 of D3 and D4 is the negative input end of rectifier bridge 502.The common port B1 of D2 and D3 is the positive output end of rectifier bridge 502.The common port B2 of D1 and D4 is the negative output terminal of rectifier bridge 502.
The positive input terminal A1 of rectifier bridge 502 connects the normally opened contact of the 4th relay K 4501, and its negative input end A2 connects 220V power frequency AC negative pole by isolating switch 1.The positive output end B1 of rectifier bridge 502 connects the positive input terminal of current sensor 505, its negative output terminal B2 ground connection.
The negative pole of current sensor 505 connects first relay K 1506, second relay K 2507 and the 3rd relay K 3508 input ends respectively.The normally closed contact of first relay K 1506, second relay K 2507 and the 3rd relay K 3508 is sky and connects.
The normally closed contact of first relay K 1506 connects the positive pole of the first voltage sensor V1509, and the negative pole of the first voltage sensor V1509 is the A phase test port of measurement mechanism.
The normally closed contact of second relay K 2507 connects the positive pole of the second voltage sensor V2510, and the negative pole of the second voltage sensor V2510 is the B phase test port of measurement mechanism.
The normally closed contact of the 3rd relay K 3508 connects the positive pole of tertiary voltage sensor V3511, and the negative pole of tertiary voltage sensor V3511 is the C phase test port of measurement mechanism.
When isolating switch 1 closure, the 4th relay K 4501 is triggered, and when its normally opened contact was closed, direct current resistance test cell 5 was switched on, and the 220V industrial-frequency alternating current is added in rectifier bridge 502 two ends.502 pairs of 220V industrial-frequency alternating currents of rectifier bridge carry out rectification, output DC, and through the voltage stabilizing and the filtering of voltage stabilizer 503 and wave filter 504, the output direct current signal is used for the direct current resistance test of transmission line of electricity.
In test process, the test line three-phase is connect A, B, the C phase test port of measurement mechanism respectively, according to test process, trigger first relay K 1506, second relay K 2507 and the 3rd relay K 3508 successively, the first voltage sensor V1509, the second voltage sensor V2510 and tertiary voltage sensor V3511 are inserted the direct current resistance test loop successively, collect the magnitude of voltage and the current value of test loop successively, be used to calculate the dc resistance of test line.
Preferably, voltage stabilizer 503 is electrochemical capacitor C1.
Preferably, wave filter 504 comprises resistance R and capacitor C 2.Resistance R and capacitor C 2 are connected in parallel on respectively between the positive and negative output terminal of rectifier bridge 502.
With reference to Fig. 4, for the described power frequency parameter measuring set for high-pressure power transmission line of second embodiment of the invention is measured the direct current resistance wiring diagram.
At first, with A, the B of test line 7, C three-phase head end respectively with the corresponding connection of A, B, C test port of power frequency parameter measuring set for high-pressure power transmission line.With test line 7A, B, the terminal short circuit of C three-phase.Isolating switch 1 is connect the 220V power frequency AC.
Close circuit breaker 1 is connected the 220V AC power frequency supply, for the measurement mechanism power supply, starts master controller 3.
Master controller 3 sends the enabled instruction of direct current resistance test cell to driving circuit 4.Driving circuit 4 is according to the instruction that receives, and output drive signal triggers the 4th relay K 4501 to direct current resistance test cell 5.The normally opened contact closure of the 4th relay K 4501 is connected the direct current resistance test loop, and the 220V industrial-frequency alternating current is added between the rectifier bridge 502 positive and negative input ends.Through rectifier bridge 502 rectifications, voltage stabilizer 503 voltage stabilizings and wave filter 504 filtering, output DC is used for the direct current resistance test.
After 5 startups of direct current resistance test cell finished, master controller 3 sent successively to measure and instructs to driving circuit 4.Driving circuit 4 is according to the instruction that receives, and output drive signal triggers first relay K 1506, second relay K 2507 and the 3rd relay K 3508 successively to direct current resistance test cell 5.
When first relay K 1506 is triggered, the normally opened contact closure of K2506, the first voltage sensor V1509 inserts direct current resistance and measures the loop, measures the current value and the magnitude of voltage of test line A phase.Sampling unit 6 collects the analog quantity I of current sensor 505 and first voltage sensor V1509 output this moment respectively
A, U
A, analog quantity is converted into digital quantity, be sent to master controller 3.Second relay K 2506 is triggered, and normally opened contact disconnects.
When second relay K 2507 is triggered, the normally opened contact closure of K3507, the second voltage sensor V2510 inserts direct current resistance and measures the loop, measures the current value and the magnitude of voltage of test line B phase.Sampling unit 6 collects the analog quantity I of current sensor 505 and second voltage sensor V2510 output this moment respectively
B, U
B, analog quantity is converted into digital quantity, be sent to master controller 3.The 3rd relay K 3507 is triggered, and normally opened contact disconnects.
When the 3rd relay K 3508 is triggered, the normally opened contact closure of K4508, tertiary voltage sensor V3511 inserts direct current resistance and measures the loop, measures the current value and the magnitude of voltage of test line C phase.Sampling unit 6 collects the analog quantity I of the output of this moment current sensor 505 and tertiary voltage sensor V3511 respectively
C, U
C, analog quantity is converted into digital quantity, be sent to master controller 3.The 4th relay K 4508 is triggered, and normally opened contact disconnects.
Three-phase electricity flow valuve and magnitude of voltage that 3 pairs of master controllers receive calculate respectively, obtain the dc resistance of test line 7 three-phases.
R
A＝U
A/I
A (7)
R
B＝U
B/I
B (8)
R
C＝U
C/I
C (9)
From the above, compared with prior art, device of the present invention, the dc resistance that calculates test line that can be easy need not make test process more succinct carrying out loaded down with trivial details derivation of equation process, has shortened the test duration greatly.
Preferably, described device also comprises instruction button.Instruction button links to each other with master controller.The tester indicates to master controller 3 by the instruction button input test.Master controller 3 sends control corresponding according to the test indication that receives and instructs to driving circuit 4.For example, when carrying out the measurement of test line direct current resistance, operating personnel press the instruction button of " measurement direct current resistance ", and master controller 3 triggers first relay K 1501 by driving circuit, connect the direct current resistance test loop, carry out the direct current resistance of test line and measure.
Preferably, described device can also comprise display.Display links to each other with main control 3.The tester indicates to master controller 3 by the display input test, and master controller 3 sends control corresponding according to the test indication that receives and instructs to driving circuit 4.After master controller calculates the three-phase dc resistance value of test line, the dc resistance that calculates is sent to display shows.
Described display can also be touch display screen.Operating personnel are by touch display screen, and the test event that selection need be carried out sends corresponding test and indicates to master controller 3, carries out corresponding test job.
Compared with prior art, device of the present invention only needs primary connection just can realize test to the ultra-high-tension power transmission line direct current resistance, avoided frequent in the prior art and torn open, the wiring operation, effectively guaranteed tester's the personal safety and the safety of testing apparatus.Simultaneously, adopt device of the present invention, make test process succinct, convenient, the test process that avoided frequently tearing open, wiring causes is loaded down with trivial details, has shortened the test consumed time greatly.
Device of the present invention can also be finished the measurement to test line positive sequence resistance, zero sequence resistance, positive sequence electric capacity, zero sequence electric capacity, mutual inductive impedance, coupling capacitance simultaneously.
With reference to Fig. 5, the described power frequency parameter measuring set for high-pressure power transmission line structural drawing of third embodiment of the invention.
The difference of the described device of the 3rd embodiment and second embodiment is: described device further comprises: the 5th relay K 58, rectification unit 9 and IPM unit 10.
The input end of the 5th relay K 58 connects 220V power frequency AC positive pole by isolating switch 1, and its normally closed contact sky connects, and its normally opened contact connects rectification unit 9.
It is the 310V direct current that rectification unit 9 is used for 22V industrial frequency AC electric rectification, exports IPM unit 9 to.
The 310V direct current of the 9 pairs of rectification units in IPM unit, 8 outputs carries out inversion, generates sine wave signal.
Embodiment of the invention threeway overcommutation unit 8 and IPM unit 9 generate sine wave signal, can realize positive sequence resistance, zero sequence resistance, positive sequence electric capacity, zero sequence electric capacity, the mutual inductive impedance to test line, the measurement of coupling capacitance.
When measuring above-mentioned parameter, the parameter of Ce Lianging is operated accordingly to the test port of measurement mechanism at first as required.The test event that operating personnel need carry out by instruction button or touch display screen selection sends corresponding test and indicates to master controller 3.Master controller 3 sends control corresponding and instructs to driving circuit 4 according to the test indication that receives.When described test is designated as when measuring positive sequence resistance, zero sequence resistance, positive sequence electric capacity, zero sequence electric capacity etc., master controller 3 sends connects the instructing to driving circuit 4 of sinusoidal signal loops.Driving circuit 4 output drive signals trigger the 5th relay K 58, connect the sinusoidal signal loop, generate sine wave signal, carry out above-mentioned parameter and measure.Sampling unit 6 samplings obtain the related data that this moment, the loop was measured, and send it back master controller 3.Master controller 3 calculates each parameter value according to default computation rule, and parameter value is presented on the display screen.
Adopt device of the present invention, when test, only need the three-phase of test line is connected on the corresponding test port of described device, select corresponding test event by instruction button or touch display screen, just can realize measurement, avoid frequently tearing open in the test process, wiring operation, effectively guarantee test process security the test line parameters, make test process more succinct simultaneously, shortened the test duration greatly.
More than to a kind of power frequency parameter measuring set for high-pressure power transmission line provided by the present invention, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a power frequency parameter measuring set for high-pressure power transmission line is characterized in that, described device comprises: master controller and direct current resistance test cell;
Described direct current resistance test cell comprises: direct-flow signal generator, current sensor, first contactor, second contactor, the 3rd contactor and first voltage sensor, second voltage sensor, tertiary voltage sensor;
The positive output termination current sensor positive pole of described direct-flow signal generator, negative output terminal ground connection; Described current sensor negative pole connects the positive pole of first voltage sensor, the positive pole of second voltage sensor and the positive pole of tertiary voltage sensor by first contactor, second contactor, the 3rd contactor respectively; The negative pole of first voltage sensor, second voltage sensor and tertiary voltage sensor is respectively A, B, C phase test port;
Described device also comprises: driving circuit and sample circuit;
Described driving circuit is used for according to the steering order that is received from master controller, sends the corresponding driving signal to the direct current resistance test cell, triggers corresponding contactor;
Described sample circuit is used to gather voltage, the current analog signal that the direct current resistance test cell is measured, and is converted into digital signal, is sent to master controller;
Described master controller is used for sending controling instruction, the break-make of control contactor, and obtain voltage, the current signal of the output of direct current resistance test cell, by calculating the three-phase dc resistance value of test line.
2. device according to claim 1 is characterized in that, described direct-flow signal generator is a rectifier bridge; The positive and negative input termination AC power of described rectifier bridge, the positive pole of its positive output termination current sensor, its negative output terminal ground connection; Described rectifier bridge is converted into direct current signal with the industrial frequency AC signal, exports the direct current resistance test cell to.
3. device according to claim 2 is characterized in that, described rectifier bridge comprises first diode, second diode, the 3rd diode and the 4th diode;
The negative electrode of first diode connects the anode of second diode, and the negative electrode of second diode connects the negative electrode of the 3rd diode, and the anode of the 3rd diode connects the negative electrode of the 4th diode, and the anode of the 4th diode connects the anode of first diode;
The common port of first diode and second diode is the positive input terminal of rectifier bridge, and the common port of the 3rd diode and the 4th diode is the negative input end of rectifier bridge; The common port of second diode and the 3rd diode is the positive output end of rectifier bridge; The common port of first diode and the 4th diode is the negative output terminal of rectifier bridge.
4. device according to claim 2 is characterized in that, described first contactor, second contactor, the 3rd contactor are relay;
The negative pole of the input termination current sensor of described first relay, second relay, the 3rd relay, the normally opened contact of described first relay, second relay, the 3rd relay connects the positive pole of first voltage sensor, second voltage sensor, tertiary voltage sensor respectively, and the equal sky of its normally closed contact connects.
5. device according to claim 4 is characterized in that described device also comprises isolating switch; Described isolating switch one termination AC power, the positive input terminal of another termination master controller and rectifier bridge.
6. device according to claim 5 is characterized in that described device also comprises the 4th relay; The input end of described the 4th relay and normally opened contact are connected on respectively between the positive input terminal of isolating switch and rectifier bridge, and its normally closed contact sky connects.
7. device according to claim 5 is characterized in that described device also comprises power-supply filter; Described power-supply filter series connection is between isolating switch and master controller.
8. according to each described device of claim 1 to 7, it is characterized in that described direct current resistance test cell also comprises voltage stabilizer; Described voltage stabilizer also is connected between the positive and negative output terminal of direct current signal generation unit.
9. according to each described device of claim 1 to 7, it is characterized in that described direct current resistance test cell also comprises wave filter; Described wave filter also is connected between the positive and negative output terminal of direct current signal generation unit.
10. according to each described device of claim 1 to 7, it is characterized in that described device also comprises display screen; Described display screen links to each other with master controller, is used to show that master controller calculates the three-phase dc resistance value of test line.
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| CN2008101829030A CN101424715B (en) | 2008-12-05 | 2008-12-05 | Power frequency parameter measuring set for high-pressure power transmission line |
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| CN2008101829030A CN101424715B (en) | 2008-12-05 | 2008-12-05 | Power frequency parameter measuring set for high-pressure power transmission line |
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| CN101424715B true CN101424715B (en) | 2011-04-06 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102621389B (en) * | 2011-02-01 | 2016-04-20 | 华东电力试验研究院有限公司 | The method of testing of the coupling capacitance of transmission lines in parallel |
| CN104330632A (en) * | 2014-10-22 | 2015-02-04 | 中国石油化工股份有限公司 | Floating roof storage tank float tray connection wire on-line monitoring method |
| CN104698311B (en) * | 2015-02-25 | 2018-05-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of DC line direct current arrester live detection method |
| CN109116116A (en) * | 2018-07-16 | 2019-01-01 | 国网重庆市电力公司电力科学研究院 | A kind of wire and cable commutation device |
| CN110221133B (en) * | 2019-06-17 | 2024-08-06 | 国网湖南省电力有限公司 | Rapid phasing device for high-voltage line of power system and application method of rapid phasing device |
| CN112130508A (en) * | 2020-09-27 | 2020-12-25 | 北京博创联动科技有限公司 | Resistance acquisition device for non-road vehicle, non-road vehicle and acquisition control method |
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| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN201311456Y (en) * | 2008-12-05 | 2009-09-16 | 河南电力试验研究院 | Power frequency parameter measuring device for high-voltage transmission lines |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN201311456Y (en) * | 2008-12-05 | 2009-09-16 | 河南电力试验研究院 | Power frequency parameter measuring device for high-voltage transmission lines |
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