CN2646720Y

CN2646720Y - Transformer test bench

Info

Publication number: CN2646720Y
Application number: CN 03222874
Authority: CN
Inventors: 徐杞宪
Original assignee: ELEVATOR FITTINGS GUANGZHOU Co Ltd
Current assignee: ELEVATOR FITTINGS GUANGZHOU Co Ltd
Priority date: 2003-01-13
Filing date: 2003-01-13
Publication date: 2004-10-06
Anticipated expiration: 2013-01-13

Abstract

The utility model discloses transformer test desk, which solves the problems of energy dissipation, heating and insecurity of the load resistance and difficult smoothly adjusting to the transformer load current when testing the transformer electric parameter in particular doing temperature raising test to the power transformer; when in use no resistance is needed to be the load of the transformer, the utility model can feedback the electric energy to the main supply by the transformer, no electric energy is wasted, no elements are heated, the load current can be smoothly adjusted on the panel, the testing efficiency is improved, a plurality of testing electric energy is saved and the testing cost is reduced. The utility model with small volume and convenient operating can be used for testing the transformer productions, which is the national green power-saving technology.

Description

The transformer testing platform

The utility model provides a kind of test board of testing power supply transformer parameter.

The utilization wide range of power transformer, each enterprise, family all will use it, and Sui the raising of electrical equipment class, and the requirement of transformer is also increased.Conventional test methodologies for transformer temperature rise and voltage regulation is to adopt the load of resistance as transformer, and the resistance of regulating resistance is come the regulating load electric current, measure the winding pressure drop of rated current, can calculate voltage regulation, be energized to time rating, can measure the transformer temperature rise.There are several shortcomings in this measuring method: if transformer efficiency is bigger, then the power consumption of resistance is big, the waste electric energy, and long-term calculating, energy loss is considerable; The resistance heating amount is big, and the temperature height can't be contained on the test board, brings and regulates inconvenience, dangerous; The resistance of adjustable resistance is adjusted to stepped, can't accurately regulate electric current.

The purpose of this utility model provides a kind of transformer testing platform, it can measure powerful transformer, but almost there is not power consumption, do not generate heat, Current Regulation can be contained on the test board panel, but the electric current smooth adjustment is specially adapted to transformer production factory various in style quality inspection as transformer.

The purpose of this utility model is achieved in that for working load resistance not, the adjustable respectively AC power of voltage more than two or two is arranged in the AC transformer testing apparatus, each AC power becomes test loop with the windings in series of tested transformer respectively, in same test loop, the current direction of AC power is being opposite in a flash together with the current direction of the induced potential of the tested winding of tested transformer.Like this, in test loop, the size of loop current is as shown in the formula: I=(U1-U2)/ro i.e. difference of two reverse voltage values and the ratio of loop internal resistance (direct current resistance that comprises two power supply winding coils), the electric energy that tested Transformer Winding U1 flows out, U2 feeds back to current supply circuit by AC power, realizes no power consumption test.The voltage swing of AC power U2 is adjustable continuously, and it is also adjustable continuously that then loop current is promptly tested the load current of Transformer Winding.Because loop internal resistance ro is very little in the test loop, so its thermal losses can be ignored.So just reach nothing (little) power consumption, can smoothly make things convenient for the purpose of regulating the transformer load electric current.

Because adopt above-mentioned technical scheme, the transformer testing platform does not have power consumption, particularly powerful transformer is carried out the temperature rise test, can save many electric energy, promote the use of in the whole nation, and the electric energy of saving is appreciable.Apyrexic element in the test has increased the safety factor of testing.Regulating electric current can be with the pressure regulator smooth adjustment on the test board panel, and it is wide in variety to be specially adapted to transformer, the product test of the transformer production producer that voltage, current value differ greatly.Use present technique, test safety, energy-conservation, simple and convenient is increased work efficiency, and has reduced production cost.

Below in conjunction with drawings and Examples the utility model is further specified.

Figure one is the test circuit synoptic diagram

Figure two is circuit theory diagrams of the present utility model.

Figure three is circuit theory diagrams of transformer testing platform of the present utility model.

The embodiment of figure three is the circuit theory diagrams that can test the transformer testing platform of as many as six road secondary winding.The utility model is further introduced in conjunction with the embodiments.

Among the figure, T1 connects the test board working power, T2 connects the testing power supply of tested transformer, and A.C. contactor QC1 is that tested power of transformer switch, QC2 are that test board working power switch, QC3 are that on-off switch, the QC4 of

load

1,2,3 is on-off switches of load 4,5,6.LJ0 is tested transformer, and J01-J6 is the connection terminal of tested transformer, and LAK-73 is an overcurrent protector, and purpose is to carry out power-off protection to just, during the electric current overrate of inferior winding.LR1～LR7 is the AC transformer that replaces load to use, and L1～L6 is an AC voltage regulator, and the AC power that voltage is adjustable respectively is made up of AC transformer and AC voltage regulator.K1～K6 is a voltage-selected switch, and the voltage of tested transformer secondary output winding is carried out primary election.

When connecting transformer LJ0, press the ZA1 starting switch, A.C. contactor QC1 moves adhesive, ZC11, ZC12 contact are connected, testing power supply is powered to tested transformer LJ0, reometer A and voltage table V are arranged on the test loop, and the test loop of voltage table should separate on the terminal of receiving the tested winding of tested transformer separately with the test loop of reometer, with the pressure drop of rated current on wiring and terminal of the eliminating winding influence to test result.A0, V0, W, V1～V6 show the magnitude of voltage of primary current, voltage, power and secondary each winding of no-load transformer at this moment.

Connect down the TA1 shutdown switch, deenergization, take off tested transformer LJ0, press ZA1, ZA2, ZA3, ZA4 starting switch again, make QC1, QC2, QC3, QC4 adhesive, the normal opened contact of four A.C. contactors is closed, connect transformer testing power supply and test board working power, the K switch of each group pushes the correspondent voltage shelves, each pressure regulator is started from scratch heighten, observe the voltage table of V1～V6, be transferred to till the magnitude of voltage that is assigned to the corresponding secondary winding of tested transformer.

Press TA1, TA2, TA3, the TA4 shutdown switch, QC1～QC4 is separated, cut off testing power supply and working power, connect tested transformer LJ0, press ZA1 again, the AZ2 starting switch, make QC1, the QC2 adhesive, corresponding normal opened contact closure connects testing power supply and working power, at this moment, advanced line phase inspection, measure A.C. contactor QC3 with voltage table, QC4 often opens main contact ZC31～ZC43 two ends and answers no-voltage, if high secondary voltage to two times is arranged, the phase place of the voltage of then tested transformer-secondary voltage and load transformer is same, the voltage addition, the wiring that should exchange two terminals of tested primary winding.The inspection phase place is errorless, presses ZA3, ZA4 starting switch, and the voltage of pressure regulator is turned in QC3, QC4 adhesive down, and the current values of reometer rises, and rises to definite value, mixes up the electric current of each group with same step.This moment, the numerical value of each voltage table indication was each winding voltage value of transformer nominal load power, compared with the no-load voltage value, can calculate voltage regulation.Add rated current to the stipulated time, can measure the temperature rise of transformer.Can read rated power, rated primary current on the primary return instrument.

Claims

1, a kind of transformer testing platform, in various instrument, electric switch, connection terminal are arranged, it is characterized in that: in the respectively adjustable AC power of voltage more than two or two is arranged, each AC power becomes test loop with the windings in series of tested transformer respectively, in same test loop, the current direction of AC power is being opposite in a flash together with the current direction of the induction electromotive force of the tested winding of tested transformer.

2, transformer testing platform according to claim 1 is characterized in that: the AC power that voltage is adjustable respectively is made up of AC transformer and AC voltage regulator.

3, transformer testing platform according to claim 1 is characterized in that: reometer and voltage table are arranged in the test loop, and the test loop of voltage table separates on the terminal of receiving the tested winding of tested transformer separately with the test loop of reometer.