CN110018367A

CN110018367A - Diode pedestal signal pickup assembly

Info

Publication number: CN110018367A
Application number: CN201810033396.8A
Authority: CN
Inventors: 胡德霖; 吴祚滨; 王林; 黄涛; 李�杰
Original assignee: SUZHOU ELECTRICAL APPLIANCE SCIENCE RESEARCH INSTITUTE Co Ltd
Current assignee: SUZHOU ELECTRICAL APPLIANCE SCIENCE RESEARCH INSTITUTE Co Ltd
Priority date: 2018-01-06
Filing date: 2018-01-06
Publication date: 2019-07-16

Abstract

Title of the invention is " diode pedestal signal pickup assembly ", belongs to Signal Collection Technology field.The device is applied to provide time base signal relevant to experiment power supply waveform pass zero point for the test of large capacity High-Voltage Electrical Appliances short-circuit impact.Compared with traditional benchmark signal pickup assembly used at present in industry, no mechanical rotary part of the present invention overcomes the disadvantage that traditional benchmark signal pickup assembly structure, circuit are complicated, maintenance capacity is big, at high cost.The present apparatus utilizes the nonlinear characteristic of semiconductor diode, it solves and uses surge generator machine potential transformer as reference signal source, because voltage magnitude fluctuation range is excessive during the test of large capacity High-Voltage Electrical Appliances short-circuit impact, reference signal is caused not to be able to satisfy the problem of testing equipment normal work requires.

Description

Diode pedestal signal pickup assembly

1. technical field

Diode pedestal signal pickup assembly is that a kind of test for large capacity High-Voltage Electrical Appliances short-circuit impact provides control signal Electronic device, belong to Signal Collection Technology field.

2. background technique

The test product of large capacity High-Voltage Electrical Appliances short-circuit impact test be the high voltage electric equipment that is run in electric power network (such as Breaker, transformer etc.), to guarantee electric power network safe operation, all equipment for networking operation are required through stringent survey Examination is required with confirming that its design parameter and manufacturing process meet networking.Short-circuit impact test is that a test is difficult in network access testing Big, parameter harshness pilot project is spent, test parameters is up to hundreds of kilovolts, tens of kiloamperes.To avoid dash current to electricity The power supply of the influence of power grid supply quality, the test of large capacity High-Voltage Electrical Appliances short-circuit impact is not usually derived from electric power network, and It is to be powered using the surge generator of special designing.

According to test requirements document, large capacity High-Voltage Electrical Appliances need to control test product or test behaviour when carrying out short-circuit impact test Switch the splitting or integrating lock in the particular phases of AC-testing supply voltage, thus its control equipment " sequence controller " need by The fixed phase of reference signal acquisition device offer supply voltage.Because the corresponding reference quantity of reference signal is experiment power supply voltage Phase, so the ginseng using the zero crossing of surge generator machine potential transformer (PT) secondary voltage as reference signal Examination point is reasonable selection (system principle schematic diagram is shown in Fig. 1).

But because of the influence of the parameters such as surge generator armature-reaction, hair is impacted in the transient process of test product short circuit The set end voltage of motor can be reduced to 10% of steady-state value or so, and so big signal voltage fluctuation range leads to sequence controller It is unable to reliably working.

In order to solve the problems, such as that PT signal exists as sequence controller input signal, at present in the industry, generally use Generator is controlled with coaxial the exchanging of surge generator or photoelectricity disc system to measure the phase of surge generator output voltage indirectly Position parameter, so that sequence controller is as reference signal.

Since large-scale synchronous alternating-current generator is in transient state operating status, the revolving speed of rotor cannot objectively reflect stator The frequency of output voltage, so being derived from the tach signal phase of surge generator spindle nose and the phase of stator output voltage in test product There are errors during short circuit.

Meanwhile the exchange control generator being connect with tens of tons of weights, high-speed rotating surge generator rotor coaxial, although The measure of flexible connection is taken, rotor high vibration caused by can not still avoiding completely because of stator short circuit leads to AC servo The failure of generator mechanical structure, it is often necessary to carry out overhaul plan.

In view of the presence of the above problem, the author has invented two using the nonlinear wind vibration (see Fig. 2) of semiconductor diode Pole pipe reference signal acquisition device (schematic diagram is shown in Fig. 3).The device have directly measurement test voltage phase, without Indirect Error, Insensitive, no mechanical rotary part changed to input voltage amplitude, frequency, the features such as circuit is simple, high reliablity.

3. summary of the invention

The present invention is that surge generator machine potential transformer is being used to test as large capacity High-Voltage Electrical Appliances short-circuit impact Under conditions of reference signal sensor, made using the nonlinear wind vibration of semiconductor diode by reasonable circuit design Diode is obtained when passing through forward current, even if the current value for flowing through diode reduces 90%, end voltage is only reduced about 10%.In this case, then to diode end voltage carry out shaping, filtering, so that it may voltage magnitude, frequency range in signal Under conditions of being widely varied, the zero crossing of acquisition is accurate, amplitude stability output signal.

Working principle

Voltage transformer (PT) primary side connect surge generator stator leading-out terminal, secondary side connection by fuse F1, The sampling circuit that F2, current-limiting resistance R1 and diode D1, D2 are constituted.

According to the C-V characteristic of diode 1N4007, by taking Tj=25 DEG C of curve as an example, when R1=500 ohm, bis- electricity of PT When being pressed in variation within the scope of 10V~100V, width can be obtained at the both ends of diode using 20 milliamperes~200 milliamperes of straightways Value is the trapezoidal square wave of 0.75V~0.9V.Trapezoidal square wave is passed through by operational amplifier LM358, resistance R2, R3 and filtered electrical again Hold waveform arrangement, the filter circuit that C is constituted, acquisition zero crossing is accurate, reliable, the square wave of amplitude stability, then transmits by optical fiber System realizes the voltage matches and voltage isolation features with sequence controller, and it is excessive to solve the variation of voltage transformer signal amplitude The problem of causing sequence controller to be unable to reliably working.

4. Detailed description of the invention

4.1 attached drawing Fig. 1 are large capacity High-Voltage Electrical Appliances short-circuit impact test principle schematic diagram, in which:

(1) surge generator

(2) voltage transformer

(3) reference signal acquisition device

(4) sequence controller

(5) test operation switchs

(6) test product

4.2 attached drawing Fig. 2 are the nonlinear wind vibration of semiconductor diode (1N4007)

4.3 attached drawing Fig. 3 are diode pedestal signal pickup assembly schematic diagram, in which:

(PT) voltage transformer

(F1, F2) fuse

(D1, D2) samples diode

(R1, R2, R3) resistance

(C) filter capacitor

(LM358) operational amplifier

5. specific embodiment

5.1 technical requirements:

At 100 volts, 130 volts of maximum voltage virtual value of the secondary voltage rating virtual value of machine potential transformer (PT).It is minimum Under conditions of about 10 volts of voltage effective value (with test product relating to parameters), the available amplitude of sequence controller is ± 5 volts, zero crossing There is accurate, stable relation square-wave signal with the zero crossing of PT secondary voltage.

5.2 structure

Diode pedestal signal pickup assembly is in addition to machine potential transformer and the fiber optic receiver of sequence controller side, institute There is component to be incorporated into the irony electric control box with natural ventilating structure, cabinet is vertically-mounted, lower part into and out of line, Button fly front, cabinet reliable ground.

The electronic component welding equipment of diode pedestal signal pickup assembly is in one piece of printed circuit board, into and out of line plug Formula pcb terminal, printed circuit board are mounted on PCB mould group frame.Printed circuit board, Switching Power Supply, fuse holder, optical fiber are sent Device, connecting terminal, power outlet etc. are all made of the bottom plate that 35 millimeters of DIN guide rails are installed on electric control box.

5.3 adjustment method

5.3.1 fuse is turned off position.

5.3.2 Switching Power Supply is connected, ± 9 volts of voltages can be measured respectively in pcb terminal.

5.3.3 it is separately connected the signal input terminal and ± 9 volts of terminals of PCB with a shorting stub, measures sequence controller Input terminal voltage to respectively correspond be ± 5 volts, can judgment means it is working properly.

6. safety notice

The voltage rating that PT is bis- times is 100 volts, and isolating transformer should usually be arranged.In order to avoid isolating transformer adds angle Influence of the difference to phase measurement accuracy, the not set isolating transformer of the present apparatus.In order to guarantee the safety behaviour of device debugging, maintenance Make, the terminal row type fuse that the present apparatus has used 2 guide rails to install, as long as pushing pulling for fixed fuse pipe aside in maintenance The obvious cut-off point between printed circuit board and PT can be obtained in hand.Terminal block fuse must make spanner direction during installation Top prevents after pushing aside because of gravity self-resetting.

Claims

1. the present invention is a kind of electronic device for belonging to Signal Collection Technology field, technical characteristic is to utilize semiconductor diode Nonlinear characteristic, under conditions of the voltage magnitude of input signal, frequency range are widely varied, the zero crossing of acquisition is quasi- Really, the output signal of amplitude stability.

Range is claimed: using semiconductor diode as the sampling element of reference signal acquisition device.