CN2099983U - Portable inter-turn voltage tester for high-voltage motor - Google Patents

Abstract

The utility model relates to an apparatus which is especially used for detecting the interturn insulation of the coils of high-voltage motor, mainly comprising a direct current high-voltage power supply part, a program control part, an electric discharge detection part, an acoustic-optic alarm circuit and a protection circuit. The apparatus applies the inversion technology and the inductance capacitance resonance principle to complete the detection. The utility model has the advantages of small size, light weight, convenience for carrying, visual display and high precision, being an ideal interturn detection apparatus. The regulative range of the peak voltage is wide.

Description

Portable inter-turn voltage tester for high-voltage motor

The utility model relates to a kind of instrument that HV Electric Machine Coil turn-to-turn insulation detects that is specifically designed to.

It is reported, existing high-voltage motor interturn testing instrument has two kinds, and a kind of is to adopt power frequency to boost, and this device volume is big, only be applicable in the testing laboratory and use, fault is gone to handle in the scene of can not mentioning, and test specification is narrow, voltage-regulation inconvenience, another kind is a high-voltage motor complete machine interturn testing instrument, itself is not with oscillograph this instrument, and wiring is more loaded down with trivial details, judges more yet difficulty.

The research the purpose of this utility model is to provide a kind of portable high-pressure motor turn-to-turn Hi-pot Tester, has overcome above two kinds of existing disadvantages of tester, this instrument has adopted high-frequency inversion technology, technological precedence, and the crest voltage range of adjustment is big, and intuitive display is easy to carry.

This utility model is used inversion transformation technique and the inductance capacitance resonance principle is finished, alternating current is varied to direct current, again its direct current is varied to high-frequency alternating current, the rectification of boosting, becoming DC voltage paired pulses electric capacity charges, again capacitance voltage is carried out impulsive discharge to motor coil, just produce resonance, reached test order ground.

With reference to Fig. 7, this is a DC high-voltage power supply part block scheme.After alternating current is rectified into direct current; (1) also filtered; direct current after the rectification charges to storage capacitor (2); storage capacitor voltage is supplied with the high-frequency alternating current (4) of inverter circuit (3) after inversion and is boosted through stepup transformer; the high-frequency and high-voltage (5) behind high-frequency rectification that produces becomes high direct voltage; the high direct voltage that paired pulses electric capacity charges on (6) electric capacity can be carried out the impulse detection test to motor coil; when but height (8) pulsed capacitance of regulated at will voltage discharges when work; feed back to control circuit (8) inversion by sample circuit (7) and quit work, shield.Feeding back to control circuit (8) by sample circuit (9) when inverter current is excessive quits work inversion, when high-voltage dc voltage surpassed given voltage, mu balanced circuit (10) work passes the signal along to control circuit (8) made control circuit (8) carry out the balance adjustment automatically.

With reference to Fig. 8, this is the sequence circuit block scheme, alternating current carries out the resultant direct current supply control circuit of rectifying and wave-filtering (1) after step-down and mu balanced circuit (2) mu balanced circuit is provided with for high-tension voltmeter, get electric (3) sound light alarming circuit (4) work simultaneously by high pressure start button inversion circuit, press discharge button, discharge loop (5) work, discharge loop (6) work simultaneously, safety ground circuit (7) work, grounding switch adhesive, discharge test begins, after reaching the schedule time, delay switching circuit (8) starts, and high-tension circuit (3) starts thereupon, charge/discharge control circuit (5) quits work, and a test loop finishes.

With reference to Fig. 9, this is a discharge examination part block scheme, after charge/discharge control circuit starts, the ball discharge and the pulsed capacitance of discharge loop (1) join, another ball discharge and grounding switch (2) join, and after grounding switch (2) action, discharge loop (1) and detection output loop (4) are connected, discharge switch this moment (1) carries out the noncontact rotating electric-discharging to detecting output loop (4), and sample circuit (3) produces signal.Be delivered to show circuit (5) show circuit (5) and demonstrate waveform, determine the test specimen quality by observing.

The utility model compared with prior art, the advantage that has is: volume is little, in light weight, be easy to carry, and the power unit of this tester has adopted advanced high-frequency inversion technology, uses noncontact rotating electric-discharging switch, the wide ranges that crest voltage is regulated, discharge energy can reach 20J.Intuitive display is measured accurately, is a kind of comparatively ideal interturn testing instrument.

Description of drawings:

Fig. 1,2 DC high-voltage power supply schematic diagrams

Fig. 3,4 control circuit schematic diagrams

Fig. 5 tester system figure

Fig. 6 discharge detection circuit schematic diagram

Fig. 7 DC high-voltage power supply part block scheme

1, rectification circuit

2, tank circuit

3, inverter circuit

4, high frequency booster circuit

5, high-frequency rectification circuit

6, high-voltage energy storage circuit

7, feedback sample circuit

8, regulating and controlling circuit

9, feedback sample circuit

10, mu balanced circuit

Fig. 8 control circuit block scheme

1, rectification circuit

2, mu balanced circuit

3, high-voltage starting circuit

4, sound light alarming circuit

5, charge/discharge control circuit

6, display circuit

7, safety ground circuit

8, delay switching circuit

Fig. 9 discharge detection circuit block scheme

1, discharge circuit

2, safety ground switch

3, sample circuit

4, detect output circuit

5, display circuit

Figure 10 panel layout

1, oscillograph

2, digital display voltage table (KV)

3, alarm for high voltage signal lamp

4, digital display time relay

5, discharge instruction signal lamp

6, output ground connection indication

7, power switch

8, high voltage adjusting

9, high voltage startup

10, voltage, current waveform conversion

11, arcing distance is regulated

12, discharge switch

Figure is deployed at Figure 11 back side

13, input insurance

14, inversion insurance

15, control insurance

16, high pressure output

17, supply hub

Figure 12 cut-away view (upper strata)

1, oscillograph

18, earth point

Figure 13 cut-away view (lower floor)

19, rotary switch motor

20, safety electromagnetic iron

21, discharging gap is regulated

22, rotating electric-discharging box

23, safety switch contact

24, high tension apparatus enclosure

25, control circuit board

26, inverter circuit plate

Implement the technical solution of the utility model with reference to description of drawings, this tester has a frame-type casing, and all devices all are contained in the frame-type shell, and workmanship of spraying plastics is adopted on the casing surface, and panel surface adopts silk-screen printing technique.High tension apparatus is in insulation is encapsulated in an insulation booth, discharge switch is encapsulated in the insulation booth made from glass-cloth board, and there is grounded shield the outside, the P.e.c. control panel through the shielding after respectively in casing before and after both sides, oscillograph is contained in the casing internal upper part, and control and display device are contained in panel top.This tester is mainly by the DC high-voltage power supply part, the programmed control part, and the discharge examination part, timing circuit, sound light alarming circuit, holding circuit is formed.With reference to Fig. 1, Fig. 2,220 volts of alternating currents insert ZL by switch FK and give C after rectifications ₁Filtering is by C ₁C ₂The energy storage of charging, its voltage can reach the peak value of input voltage, wherein C ₂Effect is to supply with T1 operating voltage, C ₃Supply with T ₂Operating voltage shields during RD inversion work, is connected on the R of RD back ₂₆Play metering function, the effect that pulse transformer T is set is to supply with T ₁T ₂The opposite trigger pip of polarity, only 11 pin and 14 pin at Ic3525 have under the situation of output, and T just has trigger pip, T ₁T ₂Just be operated under the inverter mode after being triggered, its reverse frequency is elementary 5 and 6 ends that the alternating voltage after the 50KHz inversion is delivered to step-up transformer, and just have high-frequency and high-voltage to produce at output terminal 7,8 this moment, through high frequency silicon stack GL rectification, voltage max after the rectification can reach 20KV, and this voltage is through R ₂₇After the current limliting, to pulsed capacitance C ₉Charging, C ₉Voltage carries out the power supply that discharge impact detects, R as discharge switch to test specimen ₇C ₈R ₈C ₄Be that resistance capaciting absorpting circuit plays protection T ₁T ₂The superpotential effect is provided with C ₆Be to prevent that the prime DC voltage from entering B ₁

Ic3525 is the inversion control core, can produce the control signal voltage of 50KHz, and 15 pin and 12 pin are power inputs, and 2 pin are reference voltage input, and it passes through R ₁₇Be connected on the multiturn potentiometer Wu center tap, rotate Wu, just can reach and adjust the effect of input voltage size, output terminal is also changed by 11 pin and 14 pin voltages thereupon.Through R ₁₃Receive on T elementary, secondary generation signal voltage removes to trigger T ₁T ₂, having reached the effect of control inverter output voltage size, 10 pin are control ends, when excessive, induce signal through D through current detector VH as the inversion working current ₁D ₂After the detection, by stabilivolt ZK ₁V ₂Deliver to 10 pin, Ic3525 stops to export inversion to be ended.Reached protective effect, U has been set ₂Be in order to adjust the scope of starting to control, as C ₉R during discharge ₁₄R ₁₅R ₁₆Just produce a sampled signal through photoelectricity combined device GB ₂Feed back to 10 pin, same Ic3525 stops output and has played C ₉During discharge, the effect of inversion automatic cut-off surpasses given range as producing high pressure, by R ₁₂The comparison signal that produces is through GB ₁Deliver to 1 pin, output voltage is adjusted, reached the automatic voltage regulation effect, C is set ₁₃Effect prevents that bigger rush of current, i.e. soft starting circuit are arranged when inversion from starting working.The field effect transistor T of this DC high-voltage power supply ₁T ₂One end and capacitor C ₂C ₃Connect the other end and capacitor C ₂C ₃Mid point connect stepup transformer B ₁5 and 6 end and capacitor C ₆And C ₂C ₃Mid point connect B ₁7 be connected with high frequency silicon stack GL with 8 ends; Output terminal 11 pin of integrated circuit block Ic3525 are connected with T in addition, control end 2 pin and the R of Ic3525 ₁₇, potentiometer Wu connects, control end 18 pin and the R of Ic3525 ₂₀, photoelectric coupling circuit GB ₁, GB ₂Connect.This is to obtain 12V voltage after programmed control embodiment alternating current 220V is partly given step-down rectifier with reference to Fig. 3, Fig. 4, and one the road delivers to sequence circuit after the filtering, and another road is used as digital display high pressure gauge power supply after the IC7805 voltage stabilizing.IC ₁556, IC ₂The 556th, programmed control part core, their 7 pin and 14 pin are power inputs, IC ₂556 4 pin are shutdown sides of The whole control, earlier the time relay are preset to certain hour during work, press K ₁, IC ₂Low level of 6 pin input of 556 makes IC ₂556 5 pin output high level, J at this moment ₃Adhesive, J3-1, J3-2 adhesive dc high-voltage source circuit get electric, IC ₂5 pin voltages are through R ₃Deliver to IC ₁4 pin, IC ₁5 pin and 9 pin promptly have high level output, through R ₄Be connected on the D of 5 pin ₁Begin flash of light, through C ₅The DL that is connected on 9 pin begins to send audible alarm, to show high pressure is arranged in the machine, presses K ₂, IC ₂Low level of 8 pin input, high level of its 9 pin output, J ₂Adhesive, D ₃Bright indication discharge beginning, D ₂Originally bright indication grounding switch is in ground state, but because so 9 pin have high level output D ₂Go out, behind the arrival preset time, K ₃Closed, IC ₂Low level of 4 pin input, 9 pin and 5 pin are output low level all, J ₃J ₂Discharge D ₃Go out, D ₂Bright, IC ₁4 pin obtain low level, a D thereupon simultaneously ₁DL quits work, and entire work process finishes.C is set ₉And C ₁₀Order ground, be to implement delay switching circuit, if surpass K preset time ₃Be failure to actuate C in the certain hour ₁₀Can be to IC ₂High level of 12 pin, 13 pin input, make 9 pin output low levels, J ₂Discharge, discharge stops.Do not close C for a long time as high pressure ₉Can be to IC ₂High level of 1 pin, 2 pin input, make 5 pin output low levels, J ₃Discharge, high pressure stops, and has realized order ground in limited time.This programmed control part is by IC ₁556 IC ₂556 control circuits of forming constitute IC ₁556 4 pin pass through R ₃With IC ₂556 5 pin connect, IC ₁556 3 pin and D ₁Connect its 9 pin and C ₅Connect IC ₂556 5 pin and D ₅And J ₃Connect its 9 pin and J ₂D ₃Connect 10 pin and C ₁₀Connect 1 pin and C ₉Connect J ₂(Fig. 3 Fig. 4) noncontact rotating electric-discharging switch begins to rotate discharge after the adhesive under the drive of motor ND, its contact of TK adhesive will test output line and FK connects, be connected on that test product just can be subjected to impacting with high pressure in the test loop, produced a damped oscillation this moment in the test product loop, and its oscillation frequency is

, according to the difference of test product inductance, frequency is C between tens to hundreds of KHz generally ₁C ₂R ₁R ₂It is RC divider, order ground is to provide to oscillograph to be added in voltage on the test product, just can be observed the crest voltage waveform that is added on the test product by oscillograph, HL is a current transformer, be to provide the current signal of test specimen, can demonstrate waveform behind the input oscillograph, observe the quality that just can determine test product by voltage or current waveform for oscillograph, NK is a waver, can require to change according to difference.This discharge examination part is mainly by rotating part, safety switch, and oscillograph constitutes, and motor ND is connected with the rotary switch FK that discharges, and the other end of FK is connected with TK, and the input end of SB is connected with NK, the other end of NK and MV ₁Connect.

The important technological parameters of this proving installation element is as follows:

Symbol title material material specification

FK power switch NK-300V/6A

ZL rectifier ZL-500V/5A

C ₁Capacitor C D11-600V/350 μ F

T ₁T ₂Field effect transistor N-FET800V/8A

B ₁Step-up transformer high frequency 0.4KV/24KV

GL high frequency silicon stack GL20KV/50mA

C9 pulsed capacitance 20KV/0.1 μ F

IC ₁IC ₂Integrated circuit block LM556

IC ₃Integrated circuit SGS3525A

Cl ₃Capacitor C D50/20 μ F

K ₁K ₂K ₃Button NK250V/1A

JD digital display relay DH57

Symbol title material material specification

SB oscillograph V212

ND discharge switch 4N/S1-100mm

WU potentiometer 2K Ω/1W

J ₂J ₃Relay ZJ-12V

GB ₁GB ₂Photoelectric coupling circuit GD-50V/100MA

R ₁₄R ₁₅R ₁₆Resistance 1W-0.5 Ω

D ₁D ₂D ₃Light emitting diode BT21

F ₁F ₂F ₃Fuse RD-2A

RD fuse RD-10A

TK electromagnet CT ₁₀-60 transformations of the way

Claims (1)

1, portable high-pressure motor turn-to-turn pressure resistant testing device, by the DC high-voltage power supply part, the programmed control part, the discharge examination part, timing circuit, sound light alarming circuit, the holding circuit formation is characterized in that:

The a DC high-voltage power supply is by Ic3525, T ₁T ₂B ₁The inverter circuit that constitutes is formed, C ₂C ₃With T ₁T ₂One end connects T ₁T ₂The other end and C ₂C ₅Connect B ₁5 and 6 end and C ₆And C ₂C ₃Mid point connect B ₁7 be connected with GL with 8 ends, output terminal 11 pin of Ic3525 are connected with T in addition, control end Z pin and the R of Ic3525 ₁₇, W connects control end 18 pin and the R of Ic3525 ₂₀, DB ₁GB ₂Connect;

B programmed control part is by IC ₁556, IC ₂556 control circuits of forming constitute IC ₁556 4 pin pass through R ₃With IC ₂556 5 pin connect, IC ₁556 3 pin and D ₁Connect, its 9 pin is connected IC with C5 ₂556 5 pin and D5 and J ₃Connect its 9 pin and J ₂D ₃Connect its 10 pin and C ₁₀Connect;

C discharge examination part is by rotating part, safety switch, and oscillograph constitutes, and motor ND is connected with the rotary switch FK that discharges, and the other end of FK is connected with TK, and the input end of SB is connected with NK, the other end of NK and HV ₁Connect.

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