CN205157720U - Withstand voltage test system is answered to extra -high voltage neutral point reactor telepresence - Google Patents
Withstand voltage test system is answered to extra -high voltage neutral point reactor telepresence Download PDFInfo
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- CN205157720U CN205157720U CN201520968445.9U CN201520968445U CN205157720U CN 205157720 U CN205157720 U CN 205157720U CN 201520968445 U CN201520968445 U CN 201520968445U CN 205157720 U CN205157720 U CN 205157720U
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- 238000012360 testing method Methods 0.000 title claims abstract description 82
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000002474 experimental method Methods 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 16
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Abstract
The utility model discloses a withstand voltage test system is answered to extra -high voltage neutral point reactor telepresence, survey the article unit including the experimental power of frequency conversion, testing transformer, compensating capacitor unit, quilt, the experimental power of frequency conversion, testing transformer, compensating capacitor unit, quilt are surveyed the article unit and are connected gradually, include neutral point reactor and alternating voltage measuring unit by the article of survey unit, neutral point reactor and alternating voltage measuring unit are parallelly connected. Calculate according to the field device parameter, prevent the too big damage equipment of electric current. The utility model discloses break through traditional reactor response withstand voltage test and can't carry out the experimental bottleneck of high voltage and high current at the scene, made 1000kV extra -high voltage neutral point reactor scene respond to withstand voltage enable, filled internal on -the -spot neutral point reactor response withstand voltage test's blank, effectively guaranteed the reliable safe operation of extra -high voltage engineering.
Description
Technical field
The utility model relates to neutral reactor withstand voltage test technical field, is specifically related to the on-the-spot induced over voltage withstand test system of a kind of extra-high voltage neutral reactor.
Background technology
When circuit is after the excision of both sides, the capacitive coupling existed between non-fault line and open-circuit line and inductive coupling, continue to provide secondary arc current to faulty line, thus during serious obstruction short circuit, arc light passage goes to dissociate; Simultaneously automatic reclosing is only at trouble spot arc extinction and dielectric strength just likely success after recovering, if secondary arc current is too large, can cause unsuccessful reclosing.By installing the reactor of one group of delta connection on the line additional, compensating capacitive coupling, thus suppressing the horizontal component of a part of secondary arc current; Install one group of star additional at circuit head and end and connect reactor for offsetting the vertical component of secondary arc current.Above-mentioned two groups of reactors can be equivalent to neutral point and install low reactance X over the ground additional
nthe reactor of Y-connection.
By the wave-record chart during faults such as electromagnetic transient state procedure ATP-EMTP simulation analysis and in-site modeling single-phase short circuit reclosing, known ultra-high voltage transformer station high-voltage shunt reactor neutral point and X
nit is 170.6kV that head end may bear ceiling voltage.Particularly between the first bar 1000kV in world Test and pilot project southeast Shanxi-Nanyang-Jingmen extra-high voltage limber up period, once there is the problem of neutral reactor insulation breakdown, the analysis found that it is because reactor turn-to-turn insulation is destroyed.But in current on-the-spot check test, the insulation examination for reactor is only limitted to execute withstand voltage test outward, and the method only examines the major insulation of reactor, and the turn-to-turn insulation of itself is not effectively examined.There is research institution's centering point reactor turn-to-turn insulation wire examination method to carry out tentative research in recent years both at home and abroad, and as high-frequency impulse concussion method and lightning impulse voltage test, but had no and be extensively extended in actual production.First, high-frequency impulse concussion method, only to occurring that the reactor of the defects such as turn-to-turn insulation short circuit is effective, then cannot realize measuring ability to the reactor that there is turn-to-turn insulation hidden danger and insulation breakdown do not occur; Secondly, examine turn-to-turn insulation with lightning impulse voltage test, major defect is that action time is short, and energy is low, and visual examination difficulty distinguishes, the electrical quantity variable quantity that causes of turn-to-turn short circuit is little in addition, is also difficult to distinguish from lightning impulse waveform; 3rd, above method needs huge testing equipment to drop into, and not only floor area is large, and transport, carrying, wiring are all very inconvenient.
Application number is that 200820067806.2 utility models disclose a kind of power supply device for controllable reactor induction voltage-resistant experiment and method for measurement of partial discharge thereof, relates to a kind of controlled reactor site test technology.Structure of the present utility model is variable-frequency power sources cabinet (1), intermediate transformer (2), controlled reactor (6) connect successively, for controlled reactor (6) provides experiment power supply; Controlled reactor (6), detection impedance (5), instrument for measuring partial discharge (7) connect successively, detect the partial discharge quantity of controlled reactor (6); Intermediate transformer (2), capacitive divider (3), voltage table (4) connect successively, measure the trial voltage of intermediate transformer (2); Compensation reactor (8) is connected with controlled reactor (6), compensates the reactive current of controlled reactor (6).
Application number be 201310349281.7 utility model relate to a kind of power supply device for controllable reactor induction voltage-resistant experiment, comprise variable-frequency power sources cabinet, intermediate transformer, voltage table, controlled reactor and instrument for measuring partial discharge, described variable-frequency power sources cabinet and intermediate transformer form circuit and are connected, described intermediate transformer and voltage table form circuit and are connected, described voltage table and controlled reactor form circuit and are connected, and described controlled reactor and instrument for measuring partial discharge form circuit and be connected.
Above-mentioned two patents are all about reactor induction voltage-resistant experiment, but the voltage swing 500kV electrical network of its design, can not meet the use of 1000kV electrical network, its middle transformer current comparatively conference damage transformer equipment when voltage is higher.
Utility model content
In view of this, the purpose of this utility model is for the deficiencies in the prior art, there is provided a kind of extra-high voltage neutral reactor on-the-spot induced over voltage withstand test system, induced over voltage withstand test can be carried out to 1000kV extra-high voltage neutral reactor scene, the on-the-spot boost operations to reactor can be completed.
For solving the problems of the technologies described above, technical solution adopted in the utility model is:
The on-the-spot induced over voltage withstand test system of a kind of extra-high voltage neutral reactor, comprise frequency conversion experiment power supply, testing transformer, compensation condenser unit, tested article unit, described frequency conversion experiment power supply, testing transformer, compensation condenser unit, tested article unit connect successively, described tested article unit comprises neutral reactor and ac voltage measurement unit, described neutral reactor and the parallel connection of ac voltage measurement unit.
Further, described testing transformer is exciting transformer.
Further, described compensation condenser unit comprises series compensation capacitor and parallel capacitor.
Further, described frequency conversion experiment power supply, testing transformer, series compensation capacitor, neutral reactor connect successively, and described parallel capacitor is in parallel with described neutral reactor.
Further, described frequency conversion experiment power supply comprises high-tension switch cabinet and variable-frequency power sources.
Further, described ac voltage measurement unit comprises kilovoltmeter.
The on-the-spot induced voltage test of above-mentioned extra-high voltage neutral reactor, comprises the steps:
1) carry out calculating preview according to field device parameters, prevent the excessive damage equipment of electric current, calculate induced over voltage withstand test magnitude of voltage U by neutral reactor parameter, the withstand voltage level according to 80% calculates, i.e. U=U
l* 0.8, U
lrepresent the voltage at neutral reactor two ends;
2) to the electric current I flowing through neutral reactor under trial voltage
lcalculate:
；
3) to the electric current I flowing through parallel capacitor under trial voltage
ccalculate:
；
4) to the electric current I flowing through series compensation capacitor and testing transformer
2calculate:
；
5) to electric current I
c, I
2numerical value analyze, whether the technical parameter of parallel capacitor, series compensation capacitor and testing transformer meets the demands;
6) variable-frequency power sources high-frequency is kept to export, the size of current of centering point reactor, parallel capacitor, series compensation capacitor and testing transformer is analyzed, and judges whether the insulation examination of reactor has equivalence with power frequency during actual motion;
7) calculate preview complete, field equipment connecting, frequency conversion experiment power supply output voltage, whether the thermal stability of analytical calculation neutral reactor and dynamic stability meet the demands;
8) the on-the-spot induced over voltage withstand test of neutral reactor is completed.
The utility model provides the on-the-spot induced over voltage withstand test system and method for a kind of extra-high voltage neutral reactor, ac voltage measurement unit can the voltage of centering point reactor calculate, kilovoltmeter is adopted to measure alternating voltage, be made up of high-tension measurement part and low pressure Displaying Meter, can ensure to monitor the reactor voltage of withstand voltage test, ensure that evaluation is corresponding with measurement numerical value.In method, whether equipment technical parameters meets the demands and refers to and calculate the electric current of gained or voltage within the nominal parameter of equipment, can not cause damage, carrying out smoothly of warranty test to equipment.When power supply high-frequency exports, realizing the object that series compensation capacitor and parallel capacitor play reactive-load compensation separately, is 252.4Hz through the place's loop resonance frequency calculated.The thermal stability of reactor and dynamic stability refer to specified KA Rms and Rated peak withstand current, by showing whether it meets the requirement of site test to the test of two numerical value.
The beneficial effects of the utility model are:
1) induced over voltage withstand test can be carried out to 1000kV extra-high voltage neutral reactor scene, the on-the-spot examination to reactor turn-to-turn insulation can be completed;
2) needed for pilot system, pressure build-up test transformer rated voltage is low, reduces the manufacture difficulty of testing transformer;
3) pilot system carries reactive-load compensation capacitor, and required meritorious power supply capacity is little, can realize the requirement of site test;
4) equipment conveying is convenient, and floor area is little, and test method is flexible and changeable, adapts to the transport between different tests scene.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described:
Fig. 1 is the system construction drawing of the on-the-spot induced over voltage withstand test system of the utility model extra-high voltage neutral reactor;
Fig. 2 is the system construction drawing that each equipment of the utility model links in detail;
Fig. 3 is electrical test schematic diagram of the present utility model;
Fig. 4 experiment process figure of the present utility model.
Embodiment
Show further utility model technical scheme below in conjunction with Fig. 1 to Fig. 4, embodiment is as follows:
Embodiment one
Present embodiments provide the on-the-spot induced over voltage withstand test system of a kind of extra-high voltage neutral reactor, comprise frequency conversion experiment power supply 6, testing transformer 3, compensation condenser unit 4, tested article unit 5, described frequency conversion experiment power supply 6, testing transformer 3, compensation condenser unit 4, tested article unit 5 connect successively, described tested article unit 5 comprises neutral reactor 9 and ac voltage measurement unit 10, described neutral reactor 9 and ac voltage measurement unit 10 parallel connection.The trial voltage of ac voltage measurement cell pairs point reactor is measured, the correctness of verification computation
Described testing transformer 3 comprises exciting transformer, excites resonant tank, makes inductance in loop and electric capacity generation resonance by frequency conversion experiment power supply output frequency.
Described compensation condenser unit 4 comprises series compensation capacitor 7 and parallel capacitor 8.
Described frequency conversion experiment power supply 6, testing transformer 3, series compensation capacitor 7, neutral reactor 9 connect successively, and described parallel capacitor 8 is in parallel with described neutral reactor 9.
Described frequency conversion experiment power supply 6 comprises high-tension switch cabinet 1 and variable-frequency power sources 2, and high-tension switch cabinet plays the effect of protection to testing transformer, prevents the excessive damage equipment of electric current.
Described ac voltage measurement unit 10 comprises kilovoltmeter.Adopt kilovoltmeter to measure alternating voltage, be made up of high-tension measurement part and low pressure Displaying Meter, can ensure to monitor the reactor voltage of withstand voltage test, ensure that evaluation is corresponding with measurement numerical value.
Embodiment two
Present embodiments provide the on-the-spot induced voltage test of a kind of extra-high voltage neutral reactor, comprise the steps:
1) carry out calculating preview according to field device parameters, prevent the excessive damage equipment of electric current, calculate induced over voltage withstand test magnitude of voltage U by neutral reactor parameter, the withstand voltage level according to 80% calculates, i.e. U=U
l* 0.8, U
lrepresent the voltage at neutral reactor two ends;
2) to the electric current I flowing through neutral reactor under trial voltage
lcalculate:
；
3) to the electric current I flowing through parallel capacitor under trial voltage
ccalculate:
；
4) to the electric current I flowing through series compensation capacitor and testing transformer
2calculate:
；
5) to electric current I
c, I
2numerical value analyze, whether the technical parameter of parallel capacitor, series compensation capacitor and testing transformer meets the demands;
6) variable-frequency power sources high-frequency is kept to export, the size of current of centering point reactor, parallel capacitor, series compensation capacitor and testing transformer is analyzed, and judges whether the insulation examination of reactor has equivalence with power frequency during actual motion;
7) calculate preview complete, field equipment connecting, frequency conversion experiment power supply output voltage, whether the thermal stability of analytical calculation neutral reactor and dynamic stability meet the demands;
8) the on-the-spot induced over voltage withstand test of neutral reactor is completed.
Embodiment three
For certain power grid construction, the on-the-spot induced over voltage withstand test of 1000kV extra-high voltage neutral reactor, first carry out calculating preview, the Capacity Selection of cut-offfing selecting high-tension switch cabinet is 1250A; Variable-frequency power sources adopts capacity to be 450kW frequency conversion tank, output voltage range 0 ~ 350V, exports maximum current 1285A, frequency range 30 ~ 300Hz; Testing transformer adopts excitation varying capacity to be 450kVA, and low-pressure side adopts 350V double winding in parallel, rated voltage 400V, rated current 1125A, high-pressure side rated voltage 20kV, rated current 22.5A; Series compensation capacitor selects separate unit electric capacity to be 50nF, and shnt capacitor adopts 5 electric capacitys to be that the capacitor of 50nF is in parallel, and equivalent electric capacity is 250nF; Tested neutral reactor rated capacity 329kvar, rated current 30A, power frequency impedance value 412.49 Ω, inductance value is calculated as 1.313H.
By improving the frequency of out-put supply, change the output power of whole reactive-load compensation capacitor, thus realize the object that series compensation capacitor and parallel capacitor play reactive-load compensation separately, calculating whole pressure-resistant apparatus in the loop resonance frequency that series compensation capacitor, parallel capacitor and test specimen form according to Circuit theory is 252.4Hz.
As shown in Figure 3, be electrical test schematic diagram of the present utility model, flow through the electric current I of neutral reactor
l:
；
The electric current I of parallel capacitor is flow through under trial voltage
ccalculate:
；
Flow through the electric current I of series compensation capacitor and testing transformer
2calculate:
；
Draw in the 60s of induced over voltage withstand test according to above-mentioned three formula of formula, the electric current flowing through neutral reactor is 124A, and the electric current flowing through series compensation capacitor and testing transformer is only about 20A.If take pure series resonant tank used at ordinary times, the electric current flowing through series compensation capacitor and testing transformer will reach 124A, and seriously beyond the rated current of testing transformer, scene cannot realize; And iff using the mode of parallel resonance, by the compensation of capacitor, the output current of testing transformer can be reduced, but the high-pressure side of testing transformer needs the high voltage exporting 260kV, and the difficulty of device fabrication is too large, cannot be applied to site test.The utility model is by being transformed daily used pressurized system, and the mode utilizing connection in series-parallel to combine achieves system resonance, existing equipment basis reaches and flows through test specimen high voltage, the object of big current.
Equipment to scene: high-tension switch cabinet, variable-frequency power sources, testing transformer, series compensation capacitor, parallel capacitor, neutral reactor and kilovoltmeter carry out wiring, carry out site test according to the result calculating preview, the thermal stability and the dynamic stability that detect reactor all meet the demands.
The utility model test method is clear, breach the bottleneck that conventional reactor induced over voltage withstand test cannot carry out high-voltage large current test at the scene, make 1000kV extra-high voltage neutral reactor scene carry out inducting-voltage proof and become possibility, fill up the blank of domestic on-the-spot neutral reactor induced over voltage withstand test, effectively ensure the reliable and secure operation of extra-high voltage project.
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, other amendments that those of ordinary skill in the art make the technical solution of the utility model or equivalently to replace, only otherwise depart from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of right of the present utility model.
Claims (6)
1. the on-the-spot induced over voltage withstand test system of extra-high voltage neutral reactor, it is characterized in that: comprise frequency conversion experiment power supply, testing transformer, compensation condenser unit, tested article unit, described frequency conversion experiment power supply, testing transformer, compensation condenser unit, tested article unit connect successively, described tested article unit comprises neutral reactor and ac voltage measurement unit, described neutral reactor and the parallel connection of ac voltage measurement unit.
2. the on-the-spot induced over voltage withstand test system of extra-high voltage neutral reactor as claimed in claim 1, is characterized in that: described testing transformer is exciting transformer.
3. the on-the-spot induced over voltage withstand test system of extra-high voltage neutral reactor according to claim 1, is characterized in that: described compensation condenser unit comprises series compensation capacitor and parallel capacitor.
4. the on-the-spot induced over voltage withstand test system of extra-high voltage neutral reactor according to claim 3, it is characterized in that: described frequency conversion experiment power supply, testing transformer, series compensation capacitor, neutral reactor connect successively, and described parallel capacitor is in parallel with described neutral reactor.
5. the on-the-spot induced over voltage withstand test system of extra-high voltage neutral reactor according to claim 1, is characterized in that: described frequency conversion experiment power supply comprises high-tension switch cabinet and variable-frequency power sources.
6. the on-the-spot induced over voltage withstand test system of extra-high voltage neutral reactor according to claim 1, is characterized in that: described ac voltage measurement unit comprises kilovoltmeter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259489A (en) * | 2015-11-30 | 2016-01-20 | 国网河南省电力公司电力科学研究院 | Extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259489A (en) * | 2015-11-30 | 2016-01-20 | 国网河南省电力公司电力科学研究院 | Extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system and method |
| CN105259489B (en) * | 2015-11-30 | 2018-01-26 | 国网河南省电力公司电力科学研究院 | Extra-high voltage neutral reactor scene induced over voltage withstand test system and method |
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