CN102818967A

CN102818967A - Wiring group judging instrument for three-phase transformer

Info

Publication number: CN102818967A
Application number: CN2012102961748A
Authority: CN
Inventors: 韩国强; 吴立
Original assignee: Maanshan MCC 17 Engineering Science and Technology Co Ltd
Current assignee: Maanshan MCC 17 Engineering Science and Technology Co Ltd
Priority date: 2012-08-20
Filing date: 2012-08-20
Publication date: 2012-12-12

Abstract

The invention relates to a wiring group judging instrument for a three-phase transformer. The wiring group judging instrument comprises an instrument casing, a press button switch S1, a double-digit seven-section LED (light emitting diode) display, a high-voltage binding post AB, low-voltage binding posts a, b and c, a sensing pulse signal processing circuit and a measurement pulse generating unit 1, wherein the sensing pulse signal processing circuit comprises a sensing signal picking circuit 3, a descrambling threshold circuit 4, a synchronous filtering circuit 5, an amplification shaping circuit 6, a split electrode output unit 7, a digital compiling unit 8, a latch driving unit 9 and a group digital display unit 10. The wiring group judging instrument has the advantages that convenience, high speed, precision and novelty are realized, the measurement time is short, the precision is high, the wiring group judging instrument can be operated by one person, a three-phase power supply is not needed, and the wiring group can be directly displayed by digits when a press button is pressed.

Description

Three-phase transformer wiring group decision instrument

Technical field

The present invention relates to the new instrument that a kind of three-phase transformer wiring group is judged.

Background technology

The judgement of three-phase transformer wiring group is the important content of transformer unit test, and the transformer connection group is identical simultaneously also is the essential condition of power transformer parallel running.The mensuration of traditional transformer connection group has two kinds of DC-method and AC methods, and DC-method is lower at cell voltage, capacity hour often causes and measures failure; AC method, when accuracy of instrument low also often mapping failure unstable at power supply.At least need more than two people condition that AC method also exists the scenes such as three-phase supply of needs one constant volume not necessarily to possess when these two kinds of common shortcomings of method are measurement in addition.

Summary of the invention

The object of the invention is exactly to solve the inconvenience of present judgement three-phase transformer method that wiring group adopts and is the defective of very complicated mensuration process and measurement failure sometimes; A kind of convenient, fast, accurate, novel three-phase transformer connection group decision instrument is proposed; Measuring Time is short, precision is high, a people just can operate, do not need three-phase supply; When touching the button, numeral just directly demonstrates wiring group.

Technical scheme of the present invention is like this design: a kind of three-phase transformer wiring group decision instrument is characterized in: it comprises instrument housing, be contained in pushbutton switch S1 on the housing, be contained in seven sections light-emitting diode displays of double figures on the housing, be loaded on reception on the housing surveys the high tension terminal AB of transformer high-voltage side, is contained in reception on the housing and surveys low tension terminal a and b and the c of step down side, inductive impulse signal processing circuit, the output in the housing in the housing and measure pulse by force to binding post AB with the measurement pulse generation unit 1 of synchronizing pulse is provided for the inductive impulse signal processing circuit; The inductive impulse signal processing circuit comprises to be picked up out ab and bc and ac from low tension terminal inductive impulse and the induced signal of doing necessary current potential conversion is picked up circuit 3 mutually; Remove noise jamming mutually the inductive impulse and remove to disturb threshold circuit 4 from the ab that picks up and bc and ac because of transformer manufactured materials and error pulse voltage that technology produced; The synchronizing pulse that utilizes measurement pulse generation unit 1 to provide further filters out the synchronous filtering circuit 5 of non-measurement pulse duration undesired signal; To amplifying the amplification integeral type circuit 6 of integer through the signal behind the synchronous filtering; Split pole output unit 7 according to the polar signal output respective code of ab and bc and ac "+" or "-" or " 0 "; Be compiled into the polarity code the digital compilation unit 8 of the binary-coded decimal that display driver circuit can discern; With the signal latch after the numeral compiling drive send to light-emitting diode display latch driver element 9; The group digital display unit 10 that demonstrates tested transformer connection group that constitutes by seven sections light-emitting diode displays of double figures.

The present invention is convenient, fast, accurate, novel, and Measuring Time is short, precision is high, a people just can operate, do not need three-phase supply, and when touching the button, numeral just directly demonstrates wiring group.

Description of drawings

Fig. 1 is a functional-block diagram of the present invention.

Among the figure: S1---pushbutton switch; 1---measure the pulse generation unit; 2---transformer to be measured; 3---induced signal is picked up circuit; 4---remove to disturb threshold circuit; 5---the synchronous filtering circuit; 6---amplification integeral type circuit; 7---the split pole output unit; 8---digital compilation unit; 9---latch driver element; 10---group digital display unit.

Embodiment

Visible from Fig. 1, the main effect one of measuring pulse generation unit 1 is to the strong pulse AB that measures of transformer to be measured 2 high-pressure sides output, the 2nd, to the inductive impulse signal processing circuit synchronizing pulse is provided; The inductive impulse signal processing circuit comprises that induced signal is picked up circuit 3, removed to disturb threshold circuit 4, synchronous filtering circuit 5, amplification integeral type circuit 6 and split pole output unit 7, digital circuit compiling NE 8, display driver unit 9 and group digital display unit 10 thereof.The effect that induced signal is picked up unit 3 is to pick up out ab, bc, ac phase inductive impulse and do necessary current potential conversion from the low-pressure side of transformer; The effect of removing to disturb threshold circuit 4 is to remove noise jamming the ab that picks up from last unit, bc, the ac phase inductive impulse and because of transformer manufactured materials and error pulse voltage that technology produced; 5 in synchronous filtering circuit is the undesired signal that further filters out the non-measurement pulse duration; The effect of amplification integeral type circuit 6 and split pole output unit 7 is exported corresponding code according to the polar signal of ab, bc, ac "+" or "-" or " 0 "; 8 of compilation units of numeral are compiled into the binary-coded decimal that display driver circuit can be discerned to the polarity code, send to the group digital display unit 10 that is made up of seven sections light-emitting diode displays of double figures through latching driver element 9, thereby demonstrate tested transformer connection group.

High tension terminal AB end with this decision instrument before measuring links with transformer 2 on high-tension side AB to be measured respectively, and the low-pressure side a of transformer to be measured, b, c link with low tension terminal a, b, the c end of this decision instrument respectively mutually, can not wrong.

Press knob down switch S 1 during measurement and make its closure; Measure pulse generation unit 1 and will produce the strong pulse of measuring by the AB end in the high-pressure side of transformer 2 to be measured; The low-pressure side inductive impulse signal of while transformer 2 to be measured is picked up circuit 3 by the induced signal of this decision instrument and is picked up with ab phase, bc phase, ac phase; The ab phase of picking up (bc phase, ac phase) signal is through removing to disturb threshold circuit 4 and remove noise jamming and because transformer manufactured materials and error voltage that technology produced; The meaning that further filters out other undesired signal-----synchronous filtering circuit 5 through synchronous filtering circuit 5 again is to be only our needed effective impulse at the inductive impulse that the tested transformer high-voltage side measurement pulse duration receives, otherwise gives filtering as undesired signal.Effective impulse through synchronous filtering circuit 5 is again through amplification integeral type circuit 6 amplifications and integer; Get into split pole output unit 7; Polarity according to ab phase (bc phase, ac phase) effective impulse gets into "+" or "-" or " 0 " passage, is processed into the level signal output of representative "+" "-" " 0 " respectively.Three output circuits of "+" "-" " 0 " can only have one for high level also must have one for high level, are high level if two or two above output circuits are arranged, and then measure failure, and signal can't get into the back level.Get into the effective impulse ab phase, bc phase, ac phase (referring to each "+" "-" " 0 " of self mutually) of back level polarity according to self; Should respectively there be one to be high level; So just obtain ab phase, bc phase, ac and amount to three high level pulses mutually; These three high level pulses have been contained 12 groups of transformer connection groups; For compatible, also must three groups of effective impulses be become the pulse of digital display driving circuit ability identified signal, again through latching driver element 9 through digital compilation unit 8 with the binary-coded decimal of binary-coded decimal; Demonstrate transformer connection group number through double-digit seven sections LED group digital display unit 10, press the purpose that can obtain tested transformer connection group when measuring pushbutton switch S1 thereby reached.

Claims

1. three-phase transformer wiring group decision instrument is characterized in that: it comprises instrument housing, be contained in pushbutton switch on the housing, be contained in display on the housing, be loaded on reception on the housing surveys the high tension terminal AB of transformer high-voltage side, is contained in reception on the housing and surveys low tension terminal a and b and the c of step down side, inductive impulse signal processing circuit, the output in the housing in the housing and measure pulse by force to binding post AB with the measurement pulse generation unit of synchronizing pulse is provided for the inductive impulse signal processing circuit; The inductive impulse signal processing circuit comprises to be picked up out ab and bc and ac from low tension terminal inductive impulse and the induced signal of doing necessary current potential conversion is picked up circuit mutually; Remove noise jamming mutually the inductive impulse and remove to disturb threshold circuit from the ab that picks up and bc and ac because of transformer manufactured materials and error pulse voltage that technology produced; The synchronizing pulse that utilizes measurement pulse generation unit to provide further filters out the synchronous filtering circuit of non-measurement pulse duration undesired signal; To amplifying the amplification integeral type circuit of integer through the signal behind the synchronous filtering; Split pole output unit according to the polar signal output respective code of ab and bc and ac "+" or "-" or " 0 "; Be compiled into the polarity code the digital compilation unit of the binary-coded decimal that display driver circuit can discern; Signal latch after the numeral compiling is driven the driver element that latchs of sending to light-emitting diode display; The group digital display unit that demonstrates tested transformer connection group that constitutes by display.

2. a kind of three-phase transformer wiring group decision instrument according to claim 1 is characterized in that: described display is double-digit seven sections light-emitting diode displays.