CN104330662B - The experimental rig and method of a kind of converter transformer DC magnetic bias - Google Patents
The experimental rig and method of a kind of converter transformer DC magnetic bias Download PDFInfo
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Abstract
The present invention is the experimental rig and method of a kind of converter transformer DC magnetic bias, the experimental rig of converter transformer DC magnetic bias includes dc source, rheostat Rw, current-limiting reactor L, capacitor, current divider, D.C. voltmeter, discharge resistance RF, buzzer, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, the present invention is tested the Specifeca tion speeification under its unloaded shape body or load condition, analyze the relation between converter power transformer Specifeca tion speeification and DC magnetic bias current size, checking converter power transformer bears the ability of D.C. magnetic biasing, timely take measures so as to ensure the safe and stable operation of converter power transformer.The test method of the present invention realizes the simulation test that D.C. magnetic biasing operating condition occurs in the case where laboratory is to converter power transformer zero load or load condition, and the tolerance made in laboratory's checking converter transformer DC magnetic bias turns into a kind of possible.
Description
Technical field
The present invention relates to the experimental rig of the converter transformer DC magnetic bias in power industry high-voltage test techniques field and
Method, specially a kind of D.C. magnetic biasing for being used to inject DC current to converter power transformer source side winding neutral point add stream device,
Belong to the experimental rig of converter transformer DC magnetic bias and the innovative technology of method.
Background technology
Converter power transformer is in actual moving process, due to being influenceed by DC transmission system, can not be kept away in its winding
Converter power transformer no-load current, unloaded damage so as to cause D.C. magnetic biasing unshakable in one's determination, can be caused by certain DC current with exempting from
Consumption, noise, vibration significantly increase, and to performances such as its load loss, temperature rises produce certain influence.Therefore, having very much must
A kind of test method that converter transformer DC magnetic bias is carried out in laboratory is worked out, under its unloaded shape body or load condition
Specifeca tion speeification tested, analyze the pass between converter power transformer Specifeca tion speeification and DC magnetic bias current size
System, checking converter power transformer bear the ability of D.C. magnetic biasing.
The content of the invention
In order to solve problems of the prior art, the present invention provides a kind of D.C. magnetic biasing and adds stream device, and the present invention uses
In to converter power transformer source side winding neutral point inject DC current.
Present invention also offers corresponding test method.The present invention realize laboratory it is unloaded to converter power transformer or
The simulation test of D.C. magnetic biasing operating condition occurs under load condition, makes in the resistance to of laboratory's checking converter transformer DC magnetic bias
Turned into a kind of possible by ability.
The present invention is to be achieved through the following technical solutions：The experimental rig of the converter transformer DC magnetic bias of the present invention,
Include dc source, rheostat Rw, current-limiting reactor L, capacitor, current divider, D.C. voltmeter, discharge resistance RF, buzzing
Device, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, the positive pole of wherein dc source pass through universal seclector
The one end of SA contact 3., 4., 7. with rheostat Rw is connected, and the rheostat Rw other end is connected with current-limiting reactor L one end,
The current-limiting reactor L other end is connected with current divider, and D.C. voltmeter is connected in parallel on the both ends of current divider, and capacitor is attempted by direct current
Between the negative pole and current-limiting reactor L of power supply, and capacitor by universal seclector SA contact 1., 2. with dc source
Negative pole connects, and one end of discharge resistance RF one end and the negative pole of dc source, one end of buzzer and semiconductor discharge tube connects
Connect, the discharge resistance RF other end and one end of the other end of buzzer and A.C. voltmeter connection, A.C. voltmeter it is another
End is connected with the other end and current divider of semiconductor discharge tube, universal seclector SA contact 5., 6., be 8. attempted by alternating current
Press table both ends.
The test method of the experimental rig of the converter transformer DC magnetic bias of the present invention, by converter transformer DC magnetic bias
The converter transformer DC magnetic bias test loop of experimental rig composition includes a converter power transformer, a D.C. magnetic biasing adds stream
Device, two intermediate experiments transformer B1 and B2, D.C. magnetic biasing add stream device respectively with converter power transformer and intermediate experiment transformation
Device B1 connections, intermediate experiment transformer B1 are connected by intermediate experiment transformer B2 with generator,
Test method comprises the following steps：
1）Before whole test loop is is powered, first D.C. magnetic biasing is added the rheostat Rw in stream device place maximum, then
Universal seclector SA inputs are selected, gradual standardsizing rheostat Rw, monitor D.C. voltmeter, injection is tested converter power transformer net
The DC current of side winding reaches test requirements document value, and this needs the stabilization process of certain time；
2）After the DC current of examination converter power transformer source side winding reaches test requirements document value, start to test loop progressively
Apply alternating voltage, in the process, monitoring direct current adds the running situation of stream device, any abnormal conditions occurs, cuts off immediately
The safety of AC power, guarantee test personnel and equipment, when ac test voltage reaches test requirements document value, carry out change of current transformation
The measurement of the various performance parameters of device, after experiment, alternating voltage is gradually reduced first to minimum, cuts off alternating voltage, secondly
Reselection universal seclector SA is cut off, and test loop is sufficiently discharged, after buzzer is no longer alarmed, uses high pressure
Special grounding rod is discharged capacitor both ends again, and the residual charge of test loop is completely eliminated.
The converter transformer DC magnetic bias being made up of the experimental rig of converter transformer DC magnetic bias of the present invention is tested back
Road includes a converter power transformer, a D.C. magnetic biasing adds stream device, two intermediate experiments transformer B1 and B2, D.C. magnetic biasing
Stream device is added to be connected respectively with converter power transformer and intermediate experiment transformer B1, intermediate experiment transformer B1 is become by intermediate experiment
Depressor B2 is connected with generator, and test method includes following experiment：
1）General measure
11）Under Light Condition
Do not put into D.C. magnetic biasing in above-mentioned test loop and add stream device, converter transformer valve-side not bringing onto load, from net side
Apply alternating voltage, respectively in 0.1~1.1Ur（Interval 0.1）Lower measurement excitation voltage, no-load current, no-load current harmonic wave, sky
Load-loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur（Interval 0.1）Lower measurement sound level, the vibration of fuel tank tank wall, are used
Oscillograph records excitation voltage, no-load current waveform simultaneously, and spectrum analysis is carried out to sound level, vibration；
12）Under load condition
Do not put into D.C. magnetic biasing in above-mentioned test loop and add stream device, the fixed load of converter transformer valve band one（According to tool
Body experimental condition is selected）, apply alternating voltage from net side, respectively in 0.1~1.1Ur（Interval 0.1）Lower measurement applies voltage, electricity
Stream, current harmonics, loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur（Interval 0.1）Lower measurement sound level, fuel tank
Tank wall vibrates, and is recorded simultaneously with oscillograph and applies voltage, current waveform, carries out spectrum analysis to sound level, vibration, uses thermal imaging system
Observe tank surface hot(test)-spot temperature；
2）Measured under D.C. magnetic biasing
21）Under Light Condition
Bringing onto load, input D.C. magnetic biasing do not add stream device, exchanged respectively converter transformer valve-side in above-mentioned test loop
Convertor transformer source side winding injection DC current 2,4,6,8,10A, apply alternating voltage, respectively under 0.1~1.1Ur from net side
Measure excitation voltage, no-load current, no-load current harmonic wave, open circuit loss, unshakable in one's determination and clamp earthing current, respectively 0.8~
Under 1.1Ur measure sound level, fuel tank tank wall vibration, with oscillograph simultaneously record excitation voltage, no-load current waveform, to sound level,
Vibration carries out spectrum analysis；
22）Under load condition
The fixed load of converter transformer valve-side band one in above-mentioned test loop（Selected according to specific experimental condition）, input is directly
Stream magnetic bias adds stream device, injects DC current 2,4,6,8,10A to converter power transformer source side winding respectively, applies from net side and exchanges
Voltage, measurement applies voltage, electric current, current harmonics, loss under 0.1~1.1Ur respectively, unshakable in one's determination and clamp earthing current, divides
Sound level, the vibration of fuel tank tank wall are measured not under 0.8~1.1Ur, is recorded simultaneously with oscillograph and applies voltage, current waveform, it is right
Sound level, vibration carry out spectrum analysis, observe tank surface hot(test)-spot temperature with thermal imaging system, are surveyed respectively in general measure and D.C. magnetic biasing
Amount is front and rear to carry out oil chromatogram analysis.
The experimental rig of the converter transformer DC magnetic bias of the present invention is to the main property under its unloaded shape body or load condition
Energy parameter is tested, and analyzes the relation between converter power transformer Specifeca tion speeification and DC magnetic bias current size, and checking is changed
Convertor transformer bears the ability of D.C. magnetic biasing, timely takes measures so as to ensure the safe and stable operation of converter power transformer.This
The test method of invention realizes occurs D.C. magnetic biasing operating condition to converter power transformer in laboratory under unloaded or load condition
Simulation test, the tolerance made in laboratory's checking converter transformer DC magnetic bias turn into it is a kind of may.
Brief description of the drawings
Fig. 1 is the schematic diagram that D.C. magnetic biasing of the present invention adds stream device；
Fig. 2 is the schematic diagram of existing converter transformer DC magnetic bias test loop；
Fig. 3 is the schematic diagram of converter transformer DC magnetic bias test loop of the present invention.
Embodiment
The D.C. magnetic biasing for being used to inject DC current to converter power transformer source side winding neutral point of the present invention adds stream device
Schematic diagram as shown in figure 1, including dc source, rheostat Rw, current-limiting reactor L, capacitor, current divider, DC voltage
Table, discharge resistance RF, buzzer, universal seclector SA, A.C. voltmeter, wherein semiconductor discharge tube, dc source are just
Pole is connected by the one end of universal seclector SA contact 3., 4., 7. with rheostat Rw, rheostat the Rw other end and current limliting
Reactor L one end connection, the current-limiting reactor L other end are connected with current divider, and D.C. voltmeter is connected in parallel on the two of current divider
End, capacitor are attempted by between the negative pole of dc source and current-limiting reactor L, and capacitor touching by universal seclector SA
1., 2. head is connected with the negative pole of dc source, discharge resistance RF one end and the negative pole of dc source, one end of buzzer and half
One end connection of conductive discharge pipe, the discharge resistance RF other end and one end of the other end of buzzer and A.C. voltmeter connect
Connect, the other end of A.C. voltmeter and the other end of semiconductor discharge tube and current divider connect, universal seclector SA contact
5., 6., be 8. attempted by A.C. voltmeter both ends.
D.C. magnetic biasing as shown in Figure 1 adds stream device, can be to converter power transformer（During rated no-load state）Source side winding is extremely
10A DC current is injected less.According to the load-carrying size of converter power transformer, by increasing the number of units in parallel of capacitor, this is straight
Stream magnetic bias adds stream device also can be under converter power transformer load condition to its source side winding injection at least 10A DC current.
Wherein, the effect of various components and parameter selection are as follows in Fig. 1：
1）Dc source：DC current is injected to test loop, is typically chosen 24V batteries.
2）Rheostat Rw：Adjust the size of test loop DC current, the Ω of resistance 0~10, power >=2000W.
3）Current-limiting reactor L：Limit value flows through the alternating current of DC power supply circuit, rated frequency 50Hz, and rated impedance >=
60 Ω, the Ω of D.C. resistance≤1, rated current >=30A.
4）Current divider and D.C. voltmeter：The DC experiment electric current in monitoring test loop, current divider 50A~500A/75mV,
D.C. voltmeter 75mV.
5）Capacitor：Alternating current path is provided, more capacitor parallel connections, rated frequency 50Hz, capacitive reactance≤6 may be selected
Ω, rated voltage 400V.
6）Discharge resistance RF and buzzer：After off-test, direct-current discharge is carried out to test loop, and carry out sound and carry
Show, discharge resistance RF resistances 500 Ω, power 1kW.
7）Universal seclector SA：Control experiment loop and the break-make of discharge loop, rated current >=30A, it is divided to two to turn
Change direction：Input, cut-out, during input：1. -2., 3. -4. leading to, 5. -6., 7. -8. break, during cut-out：1. -2., 3. -4. break, 5. -
6., 7. -8. lead to.
8）A.C. voltmeter：Monitoring direct current adds the alternating voltage at stream device output end both ends, range 600V.
9）Semiconductor discharge tube：Occur during experiment under fortuitous event, protection direct current adds stream device, avoids overvoltage
Direct current plus stream device are caused to damage.
Large-sized converter transformer is typically single-phase transformer, and common D.C. magnetic biasing loop is two specifications and models of selection
The same converter power transformer, net side is in parallel, is powered from a deck valve side, another deck valve side open circuit（Light Condition）Or the fixed load of band one
（Load condition）, as shown in Fig. 2 D.C. magnetic biasing adds stream device serial connection between two converter power transformer net side neutrality, while to
Two converter power transformer source side windings inject DC current., following major defect be present in such a D.C. magnetic biasing test loop：
First, needing the converter power transformer of two same size models, it is bigger to take test space；In addition, two changes of current
Transformer produces identical DC magnetic bias phenomena, to the various performance parameters under measurement converter transformer DC magnetic bias（Especially
It is noise）Bring difficult and influence.
The shortcomings that to overcome Fig. 2 D.C. magnetic biasing test loops, the present invention design converter power transformer direct current as shown in Figure 3
Magnetic bias test loop.The test loop includes a converter power transformer, a D.C. magnetic biasing adds stream device, two intermediate experiments
Transformer B1 and B2, D.C. magnetic biasing add stream device to be connected respectively with converter power transformer and intermediate experiment transformer B1, intermediate experiment
Transformer B1 is connected by intermediate experiment transformer B2 with generator, and the test loop only needs a converter power transformer, centre examination
The rated voltage for testing transformer B1 is far high（At least twice）In subject converter power transformer rated voltage.During experiment, intermediate transformer
B1 D.C. magnetic biasing can effectively eliminate testing equipment to test item performance parameter measurement result far below subject converter power transformer
Influence.
D.C. magnetic biasing is first added the rheostat Rw in stream device to place most by the present invention before whole test loop is is powered
Greatly, reselection universal seclector SA is put into, gradual standardsizing rheostat Rw, monitors D.C. voltmeter, becomes the injection subject change of current
The DC current of depressor source side winding reaches test requirements document value, and this needs the stabilization process of certain time.
After the DC current of examination converter power transformer source side winding reaches test requirements document value, it can start to test loop progressively
Apply alternating voltage, in the process, the running situation that direct current adds stream device should be paid close attention to, any abnormal conditions occur, should
The safety of AC power, guarantee test personnel and equipment is cut off immediately.When ac test voltage reaches test requirements document value, carry out
The measurement of the various performance parameters of converter power transformer, after experiment, alternating voltage is gradually reduced first to minimum, cuts off alternating current
Pressure, secondly reselection universal seclector SA cut-outs, are sufficiently discharged test loop, until buzzer is no longer alarmed
Afterwards, capacitor both ends are discharged again with high pressure Special grounding rod, the residual charge of test loop is completely eliminated.
The test method of the experimental rig of the converter transformer DC magnetic bias of the present invention, including following experiment：
1）General measure
11）Under Light Condition
Wiring is carried out by Fig. 3 test loops, D.C. magnetic biasing is not put into and adds stream device, converter transformer valve-side not bringing onto load,
Apply alternating voltage from net side, respectively in 0.1~1.1Ur（Interval 0.1）Lower measurement excitation voltage, no-load current, no-load current
Harmonic wave, open circuit loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur（Interval 0.1）Lower measurement sound level, fuel tank tank wall
Vibration.Excitation voltage, no-load current waveform are recorded simultaneously with oscillograph, spectrum analysis is carried out to sound level, vibration.
12）Under load condition
Wiring is carried out by Fig. 3 test loops, D.C. magnetic biasing is not put into and adds stream device, the fixed load of converter transformer valve band one
（Selected according to specific experimental condition）, apply alternating voltage from net side, respectively in 0.1~1.1Ur（Interval 0.1）Lower measurement applies
Voltage, electric current, current harmonics, loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur（Interval 0.1）Lower measurement sound
Level, the vibration of fuel tank tank wall.Recorded simultaneously with oscillograph and apply voltage, current waveform, spectrum analysis is carried out to sound level, vibration,
Tank surface hot(test)-spot temperature is observed with thermal imaging system.
2）Measured under D.C. magnetic biasing
21）Under Light Condition
Wiring is carried out by Fig. 3 test loops, bringing onto load, input D.C. magnetic biasing do not add stream device to converter transformer valve-side, point
It is other that DC current 2,4,6,8,10A are injected to converter power transformer source side winding（According to specific experimental condition, the DC current of application
Can be larger）, apply alternating voltage from net side, respectively in 0.1~1.1Ur（Interval 0.1）Lower measurement excitation voltage, unloaded electricity
Stream, no-load current harmonic wave, open circuit loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur（Interval 0.1）Lower measurement sound
Level, the vibration of fuel tank tank wall.Excitation voltage, no-load current waveform are recorded simultaneously with oscillograph, frequency spectrum point is carried out to sound level, vibration
Analysis.
22）Under load condition
Wiring, the fixed load of converter transformer valve-side band one are carried out by Fig. 3 test loops（Selected according to specific experimental condition）,
Input D.C. magnetic biasing adds stream device, injects DC current 2,4,6,8,10A to converter power transformer source side winding respectively（According to specific
Experimental condition, the DC current of application can be larger）, apply alternating voltage from net side, respectively in 0.1~1.1Ur（Interval
0.1）Lower measurement applies voltage, electric current, current harmonics, loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur（Between
Every 0.1）Lower measurement sound level, the vibration of fuel tank tank wall.Recorded simultaneously with oscillograph and apply voltage, current waveform, to sound level, vibration
Spectrum analysis is carried out, tank surface hot(test)-spot temperature is observed with thermal imaging system.
Respectively in general measure and the front and rear progress oil chromatogram analysis of D.C. magnetic biasing measurement.
Claims (3)
1. a kind of experimental rig of converter transformer DC magnetic bias, it is characterised in that include dc source, rheostat Rw, current limliting
Reactor L, capacitor, current divider, D.C. voltmeter, discharge resistance RF, buzzer, universal seclector SA, A.C. voltmeter,
The positive pole of semiconductor discharge tube, wherein dc source by universal seclector SA contact 3., 4., 7. with rheostat Rw one
End connection, the rheostat Rw other end are connected with current-limiting reactor L one end, and current-limiting reactor the L other end and current divider connect
Connecing, D.C. voltmeter is connected in parallel on the both ends of current divider, and capacitor is attempted by between the negative pole of dc source and current-limiting reactor L,
And 1., 2. capacitor is connected by universal seclector SA contact with the negative pole of dc source, discharge resistance RF one end with
One end connection of the negative pole of dc source, one end of buzzer and semiconductor discharge tube, the discharge resistance RF other end and buzzing
One end of the other end of device and A.C. voltmeter connects, the other end of A.C. voltmeter and the other end of semiconductor discharge tube and point
Device connection is flowed, 5., 6., 8. universal seclector SA contact is attempted by A.C. voltmeter both ends；Universal seclector SA be divided to two
Individual conversion direction：Input, cut-out, during input：1. -2., 3. -4. leading to, 5. -6., 7. -8. break, during cut-out：1. -2., 3. -4. break,
5. -6., 7. -8. lead to.
2. a kind of test method of the experimental rig of converter transformer DC magnetic bias, the experiment of the converter transformer DC magnetic bias
Device include dc source, rheostat Rw, current-limiting reactor L, capacitor, current divider, D.C. voltmeter, discharge resistance RF,
Buzzer, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, the wherein positive pole of dc source pass through omnipotent conversion
Switch the one end of SA contact 3., 4., 7. with rheostat Rw to be connected, the rheostat Rw other end and current-limiting reactor L one end
Connection, the current-limiting reactor L other end are connected with current divider, and D.C. voltmeter is connected in parallel on the both ends of current divider, and capacitor simultaneously connects
Between the negative pole and current-limiting reactor L of dc source, and capacitor by universal seclector SA contact 1., 2. with direct current
The negative pole connection of power supply, the discharge resistance RF one end and negative pole of dc source, one end of buzzer and semiconductor discharge tube
One end connects, the discharge resistance RF other end and the connection of one end of the other end of buzzer and A.C. voltmeter, A.C. voltmeter
The other end and the other end and current divider of semiconductor discharge tube connect, 5., 6., 8. universal seclector SA contact is attempted by
A.C. voltmeter both ends；Universal seclector SA is divided to two conversion directions：Input, cut-out, during input：1. -2., 3. -4. lead to,
5. -6., 7. -8. break, during cut-out：1. -2., 3. -4. breaking, 5. -6., 7. -8. lead to, it is characterised in that inclined by converter power transformer direct current
The converter transformer DC magnetic bias test loop of the experimental rig composition of magnetic includes a converter power transformer, a D.C. magnetic biasing
Add stream device, two intermediate experiments transformer B1 and B2, D.C. magnetic biasing add stream device respectively with converter power transformer and intermediate experiment
Transformer B1 connections, intermediate experiment transformer B1 are connected by intermediate experiment transformer B2 with generator, and test method is included such as
Lower step：
1）Before being not powered in whole test loop, first D.C. magnetic biasing is added the rheostat Rw in stream device place maximum, reselection
Universal seclector SA put into, gradual standardsizing rheostat Rw, monitor D.C. voltmeter, make injection subject converter power transformer net side around
The DC current of group reaches test requirements document value, and this needs the stabilization process of certain time；
2）After the DC current of examination converter power transformer source side winding reaches test requirements document value, start progressively to apply test loop
Alternating voltage, in the process, monitoring direct current add the running situation of stream device, any abnormal conditions occur, immediately cut-out exchange
The safety of power supply, guarantee test personnel and equipment, when ac test voltage reaches test requirements document value, it is each to carry out converter power transformer
The measurement of kind performance parameter, after experiment, alternating voltage is gradually reduced first to minimum, cuts off alternating voltage, and then choosing
Universal seclector SA cut-outs are selected, test loop is sufficiently discharged, it is special with high pressure after buzzer is no longer alarmed
Drop bar is discharged capacitor both ends again, and the residual charge of test loop is completely eliminated.
3. a kind of test method of the experimental rig of converter transformer DC magnetic bias, the experiment of the converter transformer DC magnetic bias
Device include dc source, rheostat Rw, current-limiting reactor L, capacitor, current divider, D.C. voltmeter, discharge resistance RF,
Buzzer, universal seclector SA, A.C. voltmeter, semiconductor discharge tube, the wherein positive pole of dc source pass through omnipotent conversion
Switch the one end of SA contact 3., 4., 7. with rheostat Rw to be connected, the rheostat Rw other end and current-limiting reactor L one end
Connection, the current-limiting reactor L other end are connected with current divider, and D.C. voltmeter is connected in parallel on the both ends of current divider, and capacitor simultaneously connects
Between the negative pole and current-limiting reactor L of dc source, and capacitor by universal seclector SA contact 1., 2. with direct current
The negative pole connection of power supply, the discharge resistance RF one end and negative pole of dc source, one end of buzzer and semiconductor discharge tube
One end connects, the discharge resistance RF other end and the connection of one end of the other end of buzzer and A.C. voltmeter, A.C. voltmeter
The other end and the other end and current divider of semiconductor discharge tube connect, 5., 6., 8. universal seclector SA contact is attempted by
A.C. voltmeter both ends；Universal seclector SA is divided to two conversion directions：Input, cut-out, during input：1. -2., 3. -4. lead to,
5. -6., 7. -8. break, during cut-out：1. -2., 3. -4. breaking, 5. -6., 7. -8. lead to, it is characterised in that inclined by converter power transformer direct current
The converter transformer DC magnetic bias test loop of the experimental rig composition of magnetic includes a converter power transformer, a D.C. magnetic biasing
Add stream device, two intermediate experiments transformer B1 and B2, D.C. magnetic biasing add stream device respectively with converter power transformer and intermediate experiment
Transformer B1 connections, intermediate experiment transformer B1 are connected by intermediate experiment transformer B2 with generator, and test method is included such as
Lower experiment：
11）General measure
111）Under Light Condition
Do not put into D.C. magnetic biasing in above-mentioned test loop and add stream device, converter transformer valve-side not bringing onto load, apply from net side
Alternating voltage, respectively in 0.1~1.1Ur, it is spaced under 0.1Ur and measures excitation voltage, no-load current, no-load current harmonic wave, zero load
Loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur, it is spaced under 0.1Ur and measures sound level, the vibration of fuel tank tank wall, use
Oscillograph records excitation voltage, no-load current waveform simultaneously, and spectrum analysis is carried out to sound level, vibration；
112）Under load condition
Do not put into D.C. magnetic biasing in above-mentioned test loop and add stream device, the fixed load of converter transformer valve band one, load according to tool
Body experimental condition is selected, and applies alternating voltage from net side, respectively in 0.1~1.1Ur, is spaced measurement under 0.1Ur and is applied voltage, electricity
Stream, current harmonics, loss, unshakable in one's determination and clamp earthing current, respectively in 0.8~1.1Ur, it is spaced under 0.1Ur and measures sound level, fuel tank
Tank wall vibrates, and is recorded simultaneously with oscillograph and applies voltage, current waveform, carries out spectrum analysis to sound level, vibration, uses thermal imaging system
Observe tank surface hot(test)-spot temperature；
12）Measured under D.C. magnetic biasing
121）Under Light Condition
Bringing onto load, input D.C. magnetic biasing do not add stream device, exchange rheology respectively converter transformer valve-side in above-mentioned test loop
Depressor source side winding injection DC current 2,4,6,8,10A, apply alternating voltage from net side, are measured respectively under 0.1~1.1Ur
Excitation voltage, no-load current, no-load current harmonic wave, open circuit loss, unshakable in one's determination and clamp earthing current, respectively under 0.8~1.1Ur
Sound level, the vibration of fuel tank tank wall are measured, excitation voltage, no-load current waveform is recorded simultaneously with oscillograph, sound level, vibration is carried out
Spectrum analysis；
122）Under load condition
The fixed load of converter transformer valve-side band one in above-mentioned test loop, loads and is selected according to specific experimental condition, and input is straight
Stream magnetic bias adds stream device, injects DC current 2,4,6,8,10A to converter power transformer source side winding respectively, applies from net side and exchanges
Voltage, measurement applies voltage, electric current, current harmonics, loss under 0.1~1.1Ur respectively, unshakable in one's determination and clamp earthing current, divides
Sound level, the vibration of fuel tank tank wall are measured not under 0.8~1.1Ur, is recorded simultaneously with oscillograph and applies voltage, current waveform, it is right
Sound level, vibration carry out spectrum analysis, observe tank surface hot(test)-spot temperature with thermal imaging system, are surveyed respectively in general measure and D.C. magnetic biasing
Amount is front and rear to carry out oil chromatogram analysis.
Priority Applications (1)
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| CN105467241B (en) * | 2015-12-08 | 2018-04-13 | 国家电网公司 | A kind of distribution converter transformer DC magnetic bias detecting system and its detection method |
| CN105450007A (en) * | 2015-12-09 | 2016-03-30 | 中国电力科学研究院 | Power supply for direct current magnetic biasing tests on transformers |
| CN106872789B (en) * | 2015-12-14 | 2020-07-07 | 中国电力科学研究院 | Harmonic loss measuring device of converter transformer |
| CN107870270B (en) * | 2016-09-27 | 2023-06-13 | 广州西门子能源变压器有限公司 | DC magnetic bias test equipment for transformer |
| CN109239484A (en) * | 2018-07-28 | 2019-01-18 | 中国南方电网有限责任公司 | A kind of converter power transformer equivalent model test method |
| CN109491243A (en) * | 2018-11-16 | 2019-03-19 | 国网福建省电力有限公司电力科学研究院 | A kind of external dc bias of reverse current injection inhibits the fuzzy control method of device |
| CN111398660A (en) * | 2020-04-09 | 2020-07-10 | 华北电力大学（保定） | Alternating current harmonic detection system based on converter transformer network side winding |
| CN114019286B (en) * | 2021-11-05 | 2024-04-26 | 国网四川省电力公司经济技术研究院 | Transformer direct-current magnetic bias tolerance capability checking field test method and system |
| CN117113733B (en) * | 2023-10-24 | 2024-02-02 | 国家电网有限公司西北分部 | Method and device for acquiring bias current of direct current near zone of power grid |
| CN117388780B (en) * | 2023-12-11 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device |
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