CN104808119A - 10 kV cable AC (alternate current) voltage withstanding test compensating scheme tester - Google Patents
10 kV cable AC (alternate current) voltage withstanding test compensating scheme tester Download PDFInfo
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- CN104808119A CN104808119A CN201510149572.0A CN201510149572A CN104808119A CN 104808119 A CN104808119 A CN 104808119A CN 201510149572 A CN201510149572 A CN 201510149572A CN 104808119 A CN104808119 A CN 104808119A
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Abstract
Disclosed is a 10 kV cable AC voltage withstanding test compensating scheme tester. The 10 kV cable AC voltage withstanding test compensating scheme tester comprises a case, a power module, a calculation control module, a capacitance collecting module, a display module and a keyboard module, wherein the power module, the calculation control module and the capacitance collecting module are arranged inside the case, and the display module and the keyboard module are arranged on the case; the capacitance collecting module, the calculation control module and the display module are sequentially electrically connected; the power module is electrically connected with the capacitance collecting module, the calculation control module and the display module; the keyboard module is electrically connected with the calculation control module. The 10 kV cable AC voltage withstanding test compensating scheme tester can measure the capacitance of cables and calculate capacity current and reactive current to select and directly output and display compensating schemes, thereby achieving intelligent measurement, calculation and display of the compensating schemes, reducing artificial calculation, saving calculation time, reducing labor cost and improving the working efficiency.
Description
Technical field
The present invention relates to cable ac voltage withstanding technical field of measurement and test, particularly relate to a kind of 10kV cable AC voltage withstand test compensation scheme tester.
Background technology
AC voltage withstand test be qualification cable insulation intensity the most effectively and the most direct method, it is a kind of important means ensureing cable running safety, but, under power frequency condition, because the electric capacity of cable is larger, the finite capacity of testing transformer, is difficult to add industrial frequency withstand voltage directly to equipment, so need the using compensation reactor when pressurizeing to compensate capacity current.
Currently used is all manual measurement and calculating, and not only surveying instrument, equipment are many, and data are various, and calculation procedure is complicated, and calculated amount is large, time and effort consuming, and artificial calculating easily makes mistakes, and needs repeated measurement to calculate, serious waste of resources.
Summary of the invention
In view of above defect, a kind of 10kV cable AC voltage withstand test compensation scheme tester that can substitute manual measurement and calculating is now proposed.
A kind of 10kV cable AC voltage withstand test compensation scheme tester, comprise casing, the power module be arranged in casing, calculation control module and electric capacity acquisition module, be arranged on display module on casing and Keysheet module, electric capacity acquisition module, calculation control module and display module are electrically connected successively, described power module is electrically connected with electric capacity acquisition module, calculation control module and display module, and Keysheet module is electrically connected with calculation control module.Described power module is used for providing operating voltage for electric capacity acquisition module, calculation control module and display module; Described electric capacity acquisition module is for gathering the capacitance value of tested cable and the capacitance value of collection being flowed to calculation control module; The capacitance value that described calculation control module is used for electric capacity acquisition module to collect is converted into capacity current under power frequency and rated insulation voltage, and this capacity current and inductance current are drawn compensation scheme according to the algorithm computing prestored; The compensation scheme that described display module calculates for the capacitance value and calculation control module showing tested cable; Described Keysheet module is connected with calculation control module, inputs associative operation for operating personnel, and produces corresponding input information.
In described AC voltage withstand test compensation scheme tester, electric capacity acquisition module is utilized to gather the capacitance value of tested cable, the capacitance value that electric capacity acquisition module collects by calculation control module is converted into capacity current under power frequency and rated insulation voltage, and the inductance current computing when rated insulation voltage of this capacity current and reactor is drawn compensation scheme, then compensation scheme is shown by display module, select corresponding compensation reactor to make staff according to the compensation scheme of display and cable voltage tested after connecting according to compensation scheme, and then reduce artificial calculated amount, saving calculating expends time in, reduce cost of labor, increase work efficiency.
Accompanying drawing explanation
Fig. 1 is the high-level schematic functional block diagram of 10kV cable AC voltage withstand test compensation scheme tester.
Fig. 2 is the high-level schematic functional block diagram of calculation control module.
Fig. 3 is the schematic diagram of the algorithm table prestored in selection unit.
In figure: power module 1, electric capacity acquisition module 2, calculation control module 3, input block 31, arithmetic element 32, algorithm unit 33, selection unit 34, output unit 35, display module 4, Keysheet module 5, casing 6.
Embodiment
Referring to Fig. 1 to Fig. 3,10kV cable AC voltage withstand test compensation scheme tester, comprise casing 6, the power module 1 be arranged in casing 6, calculation control module 3 and electric capacity acquisition module 2, be arranged on display module 4 on casing 6 and Keysheet module 5, electric capacity acquisition module 2, calculation control module 3 and display module 4 are electrically connected successively, power module 1 is electrically connected with electric capacity acquisition module 2, calculation control module 3 and display module 4, and Keysheet module 5 is electrically connected with calculation control module 3.
Wherein, power module 1 is for providing operating voltage needed for electric capacity acquisition module 2, calculation control module 3 and display module 4, and functions of modules realizes selecting Switching Power Supply, dry cell or lithium battery, preferred lithium battery, because of lithium battery, it can charge repeatedly, and volume is little, and pressure drop is low.
Electric capacity acquisition module 2 is for gathering the capacitance value of tested cable and exporting data to calculation control module 3.Wherein, electric capacity acquisition module 2 can realize the collection of the capacitance value of tested cable by voltammetry, bridge balance method or direct current charge-discharge method.Such as, electric capacity acquisition module 2 can be multimeter, adopts direct current charge-discharge method to complete the collection of the capacitance value of tested cable.
Calculation control module 3 is converted into capacity current for the capacitance value collected by electric capacity acquisition module 2 under power frequency and rated insulation voltage, and this capacity current and the reactor inductance current when rated insulation voltage is obtained algorithm values according to algorithm computing, and from the algorithm table prestored, obtain corresponding compensation scheme, and the compensation scheme of acquisition is supplied to display module 4.
Referring to Fig. 3, wherein, algorithm table comprises A3X gear reactor number hurdle in parallel, the reference value hurdle corresponding with A3X gear reactor number hurdle in parallel and compensation scheme hurdle, numerical range in reference value hurdle is corresponding with the compensation scheme information in compensation scheme hurdle, such as during N=2, during 0.M=0.47, finding reference value hurdle is 0.375<=0.M<0.625, and acquisition compensation scheme is A1X//NA3X.Wherein, algorithm values is the numerical value that capacity current and inductance current obtain after algorithm computing, N is positive integer or zero, it is the integral part in algorithm values, represent the number of the reactor of A3X shelves in parallel, M is comparative factor, is the fraction part in algorithm values, for the numerical range corresponding to selection reference value hurdle.
The compensation scheme that described display module 4 calculates for the capacitance value and calculation control module 3 showing tested cable, to make operating personnel select the connection gear of reactor, number of connection and annexation very easily according to the compensation scheme of display when test cable ac voltage withstanding, wherein display module 4 can be any one in charactron, touch screen or liquid crystal display.
Described Keysheet module 5 is connected with calculation control module 3, inputs associative operation for operating personnel, and produces corresponding input information.Wherein Keysheet module 5 can be any one in touch control keyboard, mechanical keyboard or membrane keyboard.
Casing 6 is for encapsulation and protect all the other each modules, and functions of modules realizes can selecting aluminum alloy material or resin material, preferred resin, and its friction force is large, and hold not easily landing, portable, shock resistance is good.
Wherein, calculation control module 3 can for having run the single-chip microcomputer of one group of computer applied algorithm, such as single-chip microcomputer adopts STM32F103RBT6 chip, wherein computer applied algorithm has been used for the calculating of capacity current and inductance current, provides the function of compensation scheme according to result of calculation lookup algorithm table.Calculation control module, after moving calculation machine application program, produces following functional unit, referring to Fig. 2:
The capacitance value that input block 31 provides for receiving electric capacity acquisition module 2, and capacitance value is supplied to arithmetic element 32;
Arithmetic element 32, for by the computing under power frequency and rated insulation voltage of read in capacitance value, draws capacity current, and capacity current is supplied to algorithm unit 33, and wherein power frequency is 50HZ, and rated insulation voltage is 17.4kV/5min;
Algorithm values, for the inductance current of capacity current and reactor is drawn algorithm values according to the algorithm prestored, is supplied to selection unit 34 by algorithm unit 33; Wherein, the algorithm prestored is specially:
Wherein, "●" represents radix point, and N is positive integer or zero, is the integral part of algorithm values, represent the number of the reactor of A3X gear in parallel, M is comparative factor, is the fraction part of algorithm values, for the numerical range in selection algorithm table corresponding to reference value hurdle, such as N.M=0.175, N=0, M=175,0.M=0.175.
Selection unit 34, for according to the algorithm values received, searches the reference value corresponding with described algorithm values in the algorithm table prestored, and from algorithm table, obtains corresponding compensation scheme according to reference value, and the compensation scheme of acquisition is supplied to output unit 35.
Output unit 35 shows for compensation scheme being supplied to display module 4.
Wherein, compensation scheme refers to the connection gear of compensation reactor, number of connection and connected mode, " // " represents in parallel, "+" represents series connection, such as A1X//2 (A3X) namely represents reactor A1X gear A3X gear in parallel another reactor A3X gear in parallel again, the reactor used in the present invention is DK 1 compensation reactor, the following form of its intrinsic parameter:
| Gear | A1X | A2X | A3X |
| Volume piezoelectric voltage (kV) | 30 | 25 | 20 |
| Rated current (mA) | 225 | 250 | 300 |
| Inductance ratings (H) | 425 | 318 | 212 |
| Power frequency induction reactance (k Ω) | 133.33 | 100 | 66.67 |
When power frequency and rated insulation voltage, the inductance current corresponding to three wiring gears of DK 1 compensation reactor is:
The inductance current of visible A3X gear is maximum, so select capacity current Ic and IA3X comparison operation in the algorithm, first corresponding reference value hurdle is selected according to the N in algorithm values through computing, namely the reactor number needing A3X gear in parallel is determined, then in the reference value hurdle of correspondence, corresponding reference value numerical range is selected according to M, thus obtain compensation way corresponding to this numerical range, namely number or the connected mode of the reactor of A2X gear or the A1X gear connected is needed, wherein in algorithm table, as N=O, during 0.M<0.125, compensation scheme is NONE, represent that the electric capacity of tested cable is little, capacity current is little, without the need to compensating, as N>=10, compensation scheme is OVER, and represent that the electric capacity of tested cable is very large, capacity current is very large, and DK 1 compensation reactor has been unsuitable for the current compensation of this cable, needs change compensation reactor or take other measures.
Below illustrate the course of work of 10kV cable AC voltage withstand test compensation scheme tester:
After being connected with tested cable by 10kV cable AC voltage withstand test compensation scheme tester, start capacitance value and the compensation scheme of measuring tested cable when power frequency and rated insulation voltage:
First, electric capacity acquisition module collects capacitance value C=118.00nf;
Secondly, calculation control module draws Ic=644.7mA, I after calculating
a3X=261mA, substitute into algorithm computing and draw algorithm values==N.M, N=2,0.M=0.47 are substituted into the algorithm table shown in Fig. 3 search draw reference value hurdle select numerical range 0.375<=0.M<0.625, the information obtaining corresponding compensation scheme hurdle is A1X//2 (A3X), and exports compensation scheme to display module;
3rd, display module display compensation scheme is A1X//2 (A3X).
The design of above-mentioned algorithm table completes test assignment for use minimal equipment, optimization scheme, reach resource optimization to use, the A3X terminal employing reactor exemplifies, and design described algorithm table, because A3X terminal inductance current is maximum, be greater than the inductance current of A2X terminal and A1X terminal, such as, can replace two A1X terminals, and according to this thinking, do not get rid of and select A1X terminal or A2X terminal design to go out algorithm table to the object of the problem reaching invention and solve.
Claims (3)
1. one kind
10kV cable AC voltage withstand test compensation scheme testerit is characterized in that: comprise casing, the power module be arranged in casing, calculation control module and electric capacity acquisition module, be arranged on display module on casing and Keysheet module, electric capacity acquisition module, calculation control module and display module are electrically connected successively, described power module is electrically connected with electric capacity acquisition module, calculation control module and display module, and described Keysheet module is electrically connected with calculation control module;
Described power module is used for providing operating voltage for electric capacity acquisition module, calculation control module and display module;
Described electric capacity acquisition module is for gathering the capacitance value of tested cable and the capacitance value of collection being flowed to calculation control module;
The capacitance value that described calculation control module is used for electric capacity acquisition module to collect is converted into capacity current under power frequency and rated insulation voltage, and this capacity current and inductance current are drawn compensation scheme according to the algorithm computing prestored;
The compensation scheme that described display module calculates for the capacitance value and calculation control module showing tested cable;
Described Keysheet module is connected with calculation control module, inputs associative operation for operating personnel, and produces corresponding input information.
2. as claimed in claim 1
10kV cable AC voltage withstand test compensation scheme tester, it is characterized in that: described calculation control module comprises input block, arithmetic element, algorithm unit, selection unit and output unit;
The capacitance value that described input block provides for receiving electric capacity acquisition module, and capacitance value is supplied to arithmetic element;
Described arithmetic element is used for the computing under power frequency and rated insulation voltage of read in capacitance value, draws capacity current, and capacity current is supplied to algorithm unit;
Described algorithm unit is used for capacity current and inductance current to calculate algorithm values according to the algorithm prestored, and algorithm values is supplied to selection unit;
Described selection unit is used for the algorithm values according to receiving, the algorithm prestored
in tablesearch the reference value corresponding with described algorithm values, and according to reference value from algorithm
in tableobtain corresponding compensation scheme, and acquisition compensation scheme is supplied to output unit;
Described output unit exports compensation scheme to display module.
3. as claimed in claim 1
10kV cable AC voltage withstand test compensation scheme tester, it is characterized in that: the algorithm prestored is specially:
Wherein, "●" represents radix point, and N is positive integer or zero, is the integral part of algorithm values, and represent the number of the reactor of A3X gear in parallel, M is comparative factor, is the fraction part of algorithm values, for from algorithm
in tableselect corresponding numerical range.
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| CN106771911A (en) * | 2016-12-09 | 2017-05-31 | 广西电友科技发展有限公司 | A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel |
| CN109212389A (en) * | 2018-08-28 | 2019-01-15 | 中铁十二局集团有限公司 | A kind of large-capacity power equipment ac voltage withstanding test method |
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