CN203191520U - AC tester for motion characteristics of on-load tap-changer of transformer - Google Patents

Abstract

The utility model relates to an AC tester for motion characteristics of an on-load tap-changer of a transformer. The AC tester comprises a power supply module, a control device, a sensor, a data acquisition module, a data analyzing module and a computer system, which are sequentially connected, wherein the sensor acquires the changes of the current, voltage, phase angle and frequency of the on-load tap-changer of the transformer before and after a transient point during a shifting process, the data analyzing module receives the data sent by the data acquisition module, eliminates current interruption of the tested on-load tap-changer due to non-defect factors through analysis, differentiates current jump due to transition resistor and contact failure of contact lead wire of the changer, and sends the error information to a display for displaying, the computer system upon reception of the data sent by the data analyzing module compares the received acquisition information and basic information content updated on a real time basis, captures the transient point of the test system, stores data within a certain scope before and after the transient point to a memory, and outputs partial waveform to the display.

Description

A kind of AC test device for transformer on-load tap-changer operating characteristic

Technical field

The utility model belongs to the transformer high-voltage test unit.

Background technology

Load ratio bridging switch is a kind of switchgear that constant voltage is provided when the load variations for transformer.Its ultimate principle is exactly to guarantee under the situation of interrupt load electric current not, realizes the switching between the tap in the Transformer Winding, thereby changes the number of turn of winding, i.e. the voltage ratio of transformer finally realizes the purpose of pressure regulation.

In power transmission and transformation industry now, high-power transformer has all been installed on-load voltage regulating switch widely, and its quality of voltage to assurance system and user plays an important role.At present developed country has mostly installed load ratio bridging switch to capacity at 10MVA and above transformer, and much more more and more China's electric system and user have also adopted ULTC, and load ratio bridging switch is its most critical, expensive components.

On-load tap changers of transformers acting characteristic DC test method can only be tested and be had the neutral point pressure regulation and zero transformer of extracting out is mutually arranged.VDCT volts ,direct-current ,test is low, method of testing exists many defectives: influenced by switch contact oxide film resistance, oil film resistance, contact surface smoothness etc., the waveform that obtains can not truly reflect the handoff procedure of switch, resolves not unique causing and can not come to a conclusion to the subjects defective.

Summary of the invention

Goal of the invention: a kind of AC test device for transformer on-load tap-changer operating characteristic is provided, solves the not uniqueness of on-load tap changers of transformers DC test wave analysis, the problem that switch motion process analysis accuracy is low.

Technical scheme:

A kind of AC test device for transformer on-load tap-changer operating characteristic comprises the power module, control device, sensor, acquisition module, data analysis module and the computer system that connect successively; Wherein:

Described power module splits the single phase poaer supply frequency conversion and is the three-phase reference power supply mutually;

Described control device is used for carrying out the parameter setting of proving installation and the start and stop control of proving installation;

Described sensor is gathered the variation of transition point front and back electric current, voltage, phase angle and frequency in the sub-connecting switch of transformer handoff procedure, is transferred to acquisition module after being transformed into electric signal;

Described acquisition module is high-speed synchronous multichannel collecting plate, gathers described sensor multiple signals synchronously and transfers to data analysis module;

Described data analysis module is transferred to display with the information that receives and shows, deposits the information that receives in storer simultaneously;

After described computer system received the data of described data analysis module transmission, the transition point of capture assay system deposited the data in the certain limit before and after it in storer, and the output partial waveform shows to display.

Beneficial effect:

(1) the utility model can carry out alternating-current measurement to three-phase, the single transformer load ratio bridging switch acting characteristic of the various tie lines groups of 10kV～500kV, and the scope of application is extensive.

(2) can get rid of interrupted that institute's non-defect cause of electric current present causes in the shunting switch DC test, distinguish because transition resistance, the formed current jump of switch contact lead-in wire loose contact can directly react the technical characteristic of shunting switch course of action.

(3) parsing of test result is unique, and the switch motion process analysis is accurate.

Description of drawings

Fig. 1 is theory diagram of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is done further explanation.

AC test device for transformer on-load tap-changer operating characteristic comprises the power module, control device, sensor, acquisition module, data analysis module and the computer system that connect successively; Wherein:

Power module comprises filtering circuit, constant-current source circuit, reference voltage circuit, 220v single phase poaer supply input frequency conversion is split exported three-phase 800v reference power supply mutually.

Control device is used for carrying out the parameter setting of proving installation and the start and stop control of proving installation.

Sensor has adopted high precision, anti-interference, Intelligent Dynamic sensor technology, gathers the variation of transition point front and back electric current, voltage, phase angle and frequency in the sub-connecting switch of transformer handoff procedure, is transferred to acquisition module after being transformed into electric signal.

Acquisition module is high-speed synchronous multichannel collecting plate, gathers described sensor multiple signals synchronously and eliminate to postpone; It is poor to reduce interchannel collection, adopts synchronous collection plate, isolated form sensor, and based on the needs of high speed acquisition, uses dual power supply to follow the tracks of power supply, and acquisition module transfers to data analysis module.

Data analysis module: the data that receive by analysis, get rid of interrupted that tested sub-connecting switch of transformer occurs that the non-defect cause of electric current causes, and distinguish because transition resistance, the formed current jump of switch contact lead-in wire loose contact, and error message is transferred to display shows.

Computer system comprises primary processor, display, storer, printer; After this computer system receives the data of described data analysis module transmission, carrying out the computer self learning data analysis compares and the data waveform analysis, the Information Monitoring that receives and the Back ground Information amount of self real-time update are compared, the transition point of capture assay system, deposit the data in the certain limit before and after it in storer, and the output partial waveform shows to display.

AC test device for transformer on-load tap-changer operating characteristic uses the 220V single phase poaer supply to be working power, it is three-phase 800V code test power supply mutually that the single phase poaer supply frequency conversion is split, deliver to the transformer that needs test, high precision, anti-interference, the Intelligent Dynamic sensor is to the test current of output, voltage, collection is told in the variation of phase angle and frequency, transfer to data analysis module after changing electric signal into, the data that the data analysis module analysis receives, get rid of interrupted that shunting switch occurs that the non-defect cause of electric current causes, and distinguish because transition resistance, the formed current jump of switch contact lead-in wire loose contact, directly react the technical characteristic of shunting switch course of action, and error message is transferred to display shows, and realize the test of zero district.Computer system after with information data analysis module analyzing and processing quantity of information and the Back ground Information amount of self real-time update compare, the transition point of capture assay system, deposit the information in the certain limit before and after it in registration card, and show that in LCD screen partial waveform is for the testing crew diagnosis.

Alternating-current measurement device of the present utility model can carry out alternating-current measurement to three-phase, the single transformer load ratio bridging switch acting characteristic of the various tie lines groups of 10kV～500kV, accurately catch, the shunting switch test of single-phase high voltage analogue transformer actual motion state is carried out in the accurately variation of electric current, voltage, phase angle and frequency before and after the transition point in the switch handoff procedure of judgement 40ms～60ms at the plus high-pressure power supply to switch with suspicion.Computer system provides the exclusive data analysis software, can carry out the late time data analyzing and processing as required, can carry out the shunting switch test of single-phase high voltage analogue transformer actual motion state at the plus high-pressure power supply to switch with suspicion, the backstage provides the exclusive data analysis software, can carry out the late time data analyzing and processing as required.

Three-phase, single-phase, three kinds of states of zero sequence that the utility model carries out under can also the analogue transformer running status, and test respectively under three kinds of states current waveform, identical with on-load tap changers of transformers actual current in service, voltage waveform.

Wave form analysis of the present utility model, basis for estimation and method: adopt standard AC sine wave power supply as testing power supply:

1. when switch transition resistance moment entered or withdraws from bridge status, because the existence of extreme difference short circuit circulation will the temporal variations of electric current occur, transition resistance entered, withdraws from bridge status generation current break.

2. judge that according to the variation of electric current between the transition resistance bridge region the time same period, single-phase transition resistance bridging time, each phase switch do not enter and withdraw from the order of bridge joint to transition resistance three-phase maximum.

When transformer attenuation constant T hour, transition resistance moment is inserted or when withdrawing from bridge joint, will have the oscillatory extinction process of short time.

4. current waveform profile is not slick and sly, and switch transition contact, main switching contact loose contact are described.

5. null value appears in current waveform, and this phase switch transition resistance 1 or 2 broken strings are described.

6. the determination methods of the single-phase shunting switch acting characteristic waveform defective of applying high voltage acquisition is the same, and the high voltage of test will puncture contact resistance bigger between contact or oil clearance, and continuity, the smoothness of the waveform that obtains are different with the low voltage test waveform.

7. zero sequence is tested three-phase waveform unanimity, tangible oscillatory process is arranged, and when certain phase transition resistance broken string took place, transformer moment sported two-phase no-load running mode from the zero sequence method of operation, hundreds of times of measuring current busts, the current curve of broken string section is a zero-bit straight line substantially.

8. in the switch contact handoff procedure because tail pushes away the not enough moment loose contact that causes of spring pressure, do not enter or withdraw from bridge joint sections after present the not slick and sly characteristics of jumping of frequent moment with waveform.

The parsing of test result is unique, and the conclusion of having done has sanction property eventually.

The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (1)

1. an AC test device for transformer on-load tap-changer operating characteristic is characterized in that: comprise the power module, control device, sensor, acquisition module, data analysis module and the computer system that connect successively; Wherein:

Described power module splits the single phase poaer supply frequency conversion and is the three-phase reference power supply mutually;

Described control device is used for carrying out the parameter setting of proving installation and the start and stop control of proving installation;

Described sensor is gathered the variation of transition point front and back electric current, voltage, phase angle and frequency in the sub-connecting switch of transformer handoff procedure, is transferred to acquisition module after being transformed into electric signal;

Described acquisition module is high-speed synchronous multichannel collecting plate, gathers described sensor multiple signals synchronously and transfers to data analysis module;

Described data analysis module is transferred to display with the information that receives and shows, deposits the information that receives in storer simultaneously;

After described computer system received the data of described data analysis module transmission, the transition point of capture assay system deposited the data in the certain limit before and after it in storer, and the output partial waveform shows to display.