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Extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system and method

A technology of withstand voltage test and reactor, applied in the direction of testing dielectric strength, etc., can solve the problems of large transformer current, can not meet the 1000kV power grid, damage transformer equipment, etc., achieve small footprint, small active power supply capacity, reduce manufacturing effect of difficulty

Active Publication Date: 2016-01-20
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above two patents are all about the reactor induction withstand voltage test, but the designed voltage is 500kV power grid, which cannot meet the use of 1000kV power grid. When the voltage is high, the current of the intermediate transformer is large and the transformer equipment will be damaged.

Method used

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  • Extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system and method
  • Extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system and method
  • Extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system and method

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Embodiment 1

[0040] This embodiment provides an on-site induction withstand voltage test system for UHV neutral point reactors, including a frequency conversion test power supply 6, a test transformer 3, a compensation capacitor unit 4, and a unit under test 5. The frequency conversion test power supply 6, test The transformer 3, the compensation capacitor unit 4, and the unit under test 5 are connected in sequence, and the unit under test 5 includes a neutral point reactor 9 and an AC voltage measurement unit 10, and the neutral point reactor 9 and the AC voltage measurement unit 10 in parallel. The AC voltage measurement unit measures the test voltage of the neutral point reactor to verify the correctness of the calculation

[0041] The test transformer 3 includes an excitation transformer, which excites a resonant circuit, and makes the inductance and capacitance in the circuit resonate by changing the output frequency of the test power supply.

[0042] The compensation capacitor unit ...

Embodiment 2

[0047] This embodiment provides an on-site induction withstand voltage test method for an UHV neutral point reactor, which includes the following steps:

[0048] 1) Calculate and preview according to the parameters of the field equipment to prevent the equipment from being damaged by excessive current. Calculate the voltage value U of the induction withstand voltage test through the parameters of the neutral point reactor, and calculate according to the withstand voltage level of 80%, that is, U=U L *0.8, U L Represents the voltage across the neutral point reactor;

[0049] 2) For the current I flowing through the neutral point reactor under the test voltage L Calculation:

[0050] ;

[0051] 3) For the current I flowing through the parallel compensation capacitor under the test voltage C Calculation:

[0052] ;

[0053] 4) For the current I flowing through the series compensation capacitor and the test transformer 2 Calculation:

[0054] ;

[0055] 5) For curre...

Embodiment 3

[0060] Aiming at the construction of a power grid, the 1000kV UHV neutral point reactor site induction withstand voltage test, firstly carry out the calculation preview, select the breaking capacity of the high voltage switchgear as 1250A; the frequency conversion power supply adopts the capacity of 450kW frequency conversion cabinet, the output voltage range is 0~ 350V, the maximum output current is 1285A, and the frequency range is 30~300Hz; the test transformer adopts excitation variable capacity of 450kVA, the low-voltage side adopts 350V double-winding parallel connection, the rated voltage is 400V, the rated current is 1125A, the rated voltage of the high-voltage side is 20kV, and the rated current is 22.5A; A single capacitance of 50nF is selected for the series compensation capacitor, and 5 capacitors with a capacitance of 50nF are used in parallel for the parallel capacitor, and the equivalent capacitance is 250nF; the rated capacity of the neutral point reactor under t...

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Abstract

The invention discloses an extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing system. The system comprises a variable-frequency testing power source, a testing transformer, a compensating capacitor unit and a tested product unit. The variable-frequency testing power source, the testing transformer, the compensating capacitor unit and the tested product unit are sequentially connected. The tested product unit comprises a neutral-point electric reactor and an alternating voltage measuring unit, and the neutral-point electric reactor and the alternating voltage measuring unit are connected in parallel. The invention further discloses an extra-high voltage neutral-point-electric-reactor site induction voltage withstanding testing method. Calculation is carried out according to parameters of site equipment, and it is prevented that a current is excessively large to damage the equipment. By means of the system and method, the bottleneck that a high-voltage large-current induction voltage withstanding test of a traditional electric reactor can not be carried out on site is broken through, it becomes possible that induction voltage withstanding of the 1,000-V extra-high voltage neutral-point electric reactor is carried out on site, the blank of domestic site neutral-point electric-reactor induction voltage withstanding tests is filled, and it is effectively guaranteed that a high-voltage project reliably and safely runs.

Description

technical field [0001] The invention relates to the technical field of withstand voltage test of a neutral point reactor, in particular to an on-site induction withstand voltage test system and method for a UHV neutral point reactor. Background technique [0002] After the line is cut off from both sides, the capacitive coupling and inductive coupling between the non-faulty line and the disconnected line will continue to provide latent power supply current to the faulty line, thereby seriously hindering the arc channel from de-separating during a short circuit; at the same time, automatic reclosing is only It is possible to succeed only after the arc at the fault point is extinguished and the dielectric strength is restored. If the submerged supply current is too large, it will cause reclosing failure. By installing a set of delta-connected reactors on the line, the phase-to-phase capacitance is compensated, thereby suppressing a part of the transverse component of the sneak...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 王伟李予全郑含博赵磊邵颖彪马伦李晓纲郭磊董曼玲丁国君
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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