CN201965178U

CN201965178U - Parameter tester for pilot frequency line

Info

Publication number: CN201965178U
Application number: CN201020687669XU
Authority: CN
Inventors: 付友君
Original assignee: CHANGSHA JINYI ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: CHANGSHA JINYI ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2010-12-29
Filing date: 2010-12-29
Publication date: 2011-09-07
Anticipated expiration: 2020-12-29

Abstract

A parameter tester for a pilot frequency line comprises a three-phase transformer, a three-phase inversion power supply, an interference bypass circuit, a six-channel sampling control measuring circuit, a current transformer, a voltage transformer, a control panel, an output equipment and the like. In addition, a variable frequency power supply module is adopted as an output power supply for measurement of the tester, the frequency can be changed into 45Hz or 55 Hz, and various on-site working frequency interference signals can be effectively avoided by digital filtering technology so that the tester can realize high-precision, accurate and reliable measurement, the calculation processing capacity can be improved on the premise of ensuring the precise measured data by adopting a fast DSP (digital signal processor) as a processing core, thus improving the reaction and processing speed of the tester. Due to the adoption of an integrated structure, the volume and weight of the tester can be greatly reduced, the tester has a compact structure, accuracy in measurement and convenience in operation; therefore, the test workload can be remarkably reduced, the working efficiency can be improved, and great convenience is provided for on-site testing.

Description

Alien frequencies line parameter circuit value tester

Technical field

The utility model relates to the ultra-high-tension power transmission line field, is specially a kind of alien frequencies line parameter circuit value tester that is applicable to the ultra-high-tension power transmission line power frequency parameter test.

Background technology

High-tension overhead line is because be in complicated electromagnetic field work condition environment, particularly when two transmission line of electricity parallel lines on same tower, article one, charged circuit may induce the induced voltage of volts up to ten thousand on another circuit, will realize that in this case the accurate measurement of line parameter circuit value just must be adopted brand-new method of testing and means.At present, measure the ultra-high-tension power transmission line power frequency parameter on the engineering and mainly use big current method (20A-50A), purpose is to think to allow as much as possible induced interference signal be unlikely to have influence on the added signal of test.But need to use powerful transformer, pressure regulator like this, isolating transformer by discrete measurement instruments such as reometer, voltage table, power meters, is respectively shown scale and is tried to achieve each parameter value through after the corresponding computing by reading.When circuit was longer, the power supply that produces a 20-50A needed the experiment power supply of 50KW-100KW, need like this weight tonne equipment more than at least three.The volume and weight of surveying instrument is very huge, and the connection complexity of each instrument cubicle needs artificial reading and deal with data, need change when measuring different parameters to measure wiring and instrument wiring, and testing experiment is loaded down with trivial details.

CPU, analog quantity are handled, AD changes, the digital frequency conversion line parameter circuit value parameter tester of display device in a kind of novel comprising, these test functions have been optimized, if power supply signal is connect filtering circuit through the IPM module, output with filtering circuit connects load by output sampling and controlling unit behind transformer again, output sampling simultaneously and controlling unit also connect the signal input part of CPU by analog quantity processing and AD modular converter, the shows signal output termination display device of CPU just can realize certain test function.

Yet during the power frequency parameter of routine measurement ultra-high-tension power transmission line, the test that exists for that power frequency is disturbed has brought very big trouble.Along with the development of electrical network and the anxiety of circuit corridor land used, the situation of setting up for many times with bar is more and more general, coupling between the transmission line of electricity is more and more tightr, disturbs more and more byer force when transmission line power frequency parameter test, has a strong impact on the accuracy of test and the security of testing tool equipment.

The utility model content

The technical matters that the utility model solved is to provide a kind of alien frequencies line parameter circuit value tester, to solve the shortcoming in the above-mentioned background technology.

The technical matters that the utility model solved realizes by the following technical solutions:

Alien frequencies line parameter circuit value tester comprises three-phase transformer, three phase inverter, interference bypass circuit, six passages control sampled measurements circuit, current transformer, voltage transformer (VT), control panel, output device etc.Wherein, disturb the bypass circuit front to connect three-phase inverting circuit and three-phase transformer, the back connects current transformer and six passages control sampled measurements circuit, and six passages control sampled measurements circuit front links to each other with current transformer, voltage transformer (VT) and interference bypass circuit, the back is connected to output device by control panel.

Described instrument adopts integral structure, be built-in with variable-frequency power sources module and variable ratio frequency changer pressure regulation out-put supply, changeable frequency is 45Hz or 55Hz, and pass through digital filtering technique, can avoid on-the-spot various power frequency interference signals effectively, make instrument realize high precision, measure accurately and reliably, by adopting DSP fast digital signal processor as handling core, can guarantee that measurement data improves its calculation process ability under the prerequisite accurately, thereby improve the reaction and the processing speed of instrument.

Described interference bypass circuit is made up of a plurality of electric capacity and inductance, will send into current transformer and six passages control sampled measurements circuit after the command signal adjustment of flow through three phase inverter and three-phase transformer from the control panel.After the information of voltage measurement terminal that described six passages control sampled measurements circuit will come from current measurement terminal, the voltage transformer (VT) of the order summation current transformer that disturbs bypass circuit is collected and is put in order, processing through DSP fast digital signal processor, show at output terminal, for the selection of next step order.

Described output device comprises liquid crystal display touch-screen, printer and PORT COM, wherein touch-screen has bigger display interface and the prompting of shirtsleeve operation step, each one all is perfectly clear, operating personnel need not be extra the professional skill training can both use, touch step and the process just can finish measurement gently.

Beneficial effect

The utility model adopts bypass circuit, greatly reduces the security threat of induced voltage to equipment and personnel; Variable-frequency power sources module and digital filtering technique have been avoided the interference of power frequency electric field to test simultaneously, fundamentally solve highfield and disturbed a difficult problem of accurately measuring down, adopt DSP high-speed figure process chip again, can also measure the power frequency parameter of transmission line of electricity extremely apace.The utility model adopts integral structure, test does not need very big electric current, just do not need very large power source, reduced the volume and weight of instrument greatly, its compact conformation, measure accurate, easy to operate, can significantly reduce the test job amount, increase work efficiency, for on-the-spot test provides great convenience.

Description of drawings

Fig. 1 is a theory structure synoptic diagram of the present utility model;

Fig. 2 is the instrument panel index map of the utility model preferred embodiment;

Fig. 3 is the wiring diagram of the utility model preferred embodiment;

Fig. 4 is the wiring diagram of another preferred embodiment of the utility model;

Fig. 5 is the wiring diagram of another preferred embodiment of the utility model;

Fig. 6 is the wiring diagram of another preferred embodiment of the utility model;

Fig. 7 is the wiring diagram of another preferred embodiment of the utility model;

Fig. 8 is the wiring diagram of another preferred embodiment of the utility model.

Wherein, circuit 5, voltage transformer (VT) 6, current transformer 7, touch-screen 8, printer 9, PORT COM 10, accessory power supply 11 are looked in control panel 1, six passages control sampled measurements circuit 2, three phase inverter 3, three-phase transformer 4, interference among Fig. 1;

Touch-screen 8, printer 9, PORT COM 10, emergency stop push button 12, system reset pad 13, testing power supply output plughole 14, voltage measurement input jack 15, ground connection binding post 16, power input socket 17, input power switch 18 among Fig. 2;

Test line 19, instrument output 20, voltage measurement 21, opposite end short circuit ground connection 22, opposite end ground connection 23, opposite end unsettled 24 among Fig. 3,4,5,6,7,8.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Referring to the alien frequencies line parameter circuit value tester of Fig. 1, comprise three-phase transformer 4, three phase inverter 3, interference bypass circuit 5, six passages control sampled measurements circuit 2, current transformer 6, voltage transformer (VT) 7, control panel 1, touch-screen 8, printer 9, PORT COM 10, accessory power supply 11 etc.Wherein, what interference bypass circuit 5 fronts connected is three-phase inverting circuit 3 and three-phase transformer 4, the back connects current transformer 7 and six passages control sampled measurements circuit 2, and six passages control sampled measurements circuit, 2 fronts link to each other with current transformer 6, voltage transformer (VT) 7 and interference bypass circuit 5, the back is by control panel 1, be connected to output device, comprise touch-screen 8, printer 9, PORT COM 10 and accessory power supply 11.

During measurement, from touch-screen 8 signal of giving an order, flow through three phase inverter 3 and three-phase transformer 4, enter and disturb in the bypass circuit 5,, send to measuring junction through disturbing adjustment and the arrangement of looking on circuit 5, measure and collect data by six passages control sampled measurements circuit 2 by the current measurement terminal of the voltage measurement terminal summation current transformer 7 of voltage transformer (VT) 6, signal is passed to processor then, is presented at touch-screen 8 by control panel 1 control, for the selection of next step order.After measuring end, can print, also can carry out external storage by the circumscribed USB interface of PORT COM 10 by printer 9.

Alien frequencies line parameter circuit value tester referring to Fig. 2 is the instrument panel index map.Wherein, emergency stop push button 12 and system reset pad 13 are the master control button, when emergency stop push button 12 was used for test process and runs into accident, all out-put supplies of emergency cut-off also made all wiring ground connection, and system reset pad 13 is used to provide the instrument internal central processing unit to reset; Testing power supply output plughole 14 connects the current measurement terminal, comprise A (yellow), B (green), C (redness) and N (black) totally 4 terminals, the instrument test out-put supply is provided, voltage measurement input jack 15 connects the voltage measurement terminal, comprise UA (yellow), UB (green), UC (redness) and UN (black) totally 4 terminals, the instrument test input voltage is provided; Ground connection binding post 16 is used to protect instrument ground, because instrument itself has earth protective device, is in ground state so will guarantee ground connection binding post 16; Power input socket 17 is used for external power supply, for instrument provides power supply power, input power switch 18 is exactly the total control switch of instrument power source, open switch, instrument enters duty, off switch is also closed all power-supply systems of instrument internal simultaneously, and emergency condition should be closed this switch immediately and be pulled out input power cord.

Referring to Fig. 3,4,5,6,7,8 alien frequencies line parameter circuit value tester, for tackling the wiring diagram of different situations, be respectively positive sequence impedance wiring, zero sequence impedance wiring, measurement of mutual inductance wiring, the wiring of positive sequence electric capacity, the wiring of zero sequence electric capacity, coupling capacitance measurement wiring.Wherein, instrument output 20, voltage measurement 21 two ends are ground connection respectively, inserts circuit-under-test 19 again respectively, and circuit-under-test 19 other end disposal routes are respectively opposite end short circuit ground connection 22, opposite end ground connection 23, opposite end unsettled 24 according to the difference of each wiring diagram.

Before the test beginning, the circuit downlead of measuring junction is reliably inserted the earth, and with the reliable the earth that insert of the instrument ground binding post 16 in the panel upper left corner, then respectively with power supply output signal ground N and the reliable respectively the earth that inserts of voltage output signal ground UN, testing power supply lead-out terminal A, B, C are connected to route survey downlead instrument power source side, at last with voltage measurement terminal UA, UB, UC line attachment downlead line side, after the instrument test wiring is finished, open the ground connection of circuit downlead again, with assurance equipment and operating personnel's safety.

Instrument test adopts the four-electrode method principle, and test line needs 3 of electric current downleads, 3 of voltage downleads, and the testing current line is positioned at the testing power supply side, and the voltage downlead is positioned at the line side, with the p-wire of elimination measuring junction and the influence of contact resistance.If the test downlead is only drawn 3 terminals, as far as possible with the enough big lead of sectional area, and assurance reliably is connected with the route survey end, avoids introducing bigger wiring error.

The instrument test wiring is very simple and direct, only need once insert above-mentioned p-wire, cooperates by the instrument automatic control survey mode and the test line opposite end mode of connection, can finish institute's order parameter and measure, and improves testing efficiency and processing safety greatly.

Instrument internal reliably connects three terminals such as instrument ground binding post in N, UN, the upper left corner, and it is just passable that the instrument ground binding post that can only connect the upper left corner during field wiring is received the earth.

When connecting instrument and test line, guarantee route survey end reliable ground, the back recovery is finished in test, gets ground wire, and instrument can be abutted against the earth, notices that each test signal ground wire will finish according to the wiring index map.

In the described output device, printer is full-automatic temperature-sensitive printer, and PORT COM is a USB interface, can utilize USB flash disk to shift very easily and stores data and measurement result.Wherein, the storage data can reach 100 groups.

More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. alien frequencies line parameter circuit value tester, comprise three-phase transformer, three phase inverter, interference bypass circuit, six passages control sampled measurements circuit, current transformer, voltage transformer (VT), control panel, output device, it is characterized in that, described instrument is integrated, built-in variable-frequency power sources module and variable ratio frequency changer pressure regulation out-put supply, changeable frequency is 45Hz or 55Hz.

2. alien frequencies line parameter circuit value tester according to claim 1 is characterized in that, described instrument adopts DSP high-speed figure process chip.

3. alien frequencies line parameter circuit value tester according to claim 1 is characterized in that described output device comprises LCDs, printer and PORT COM, and wherein, described LCDs is the touch-screen that shows the operation steps prompting.