Summary of the invention
At the problems referred to above, but the purpose of this invention is to provide the lightning arrester various waveform aging test device of a kind of integrated use in the multiple waveform accelerated aging test of AC and DC lightning arrester.
For achieving the above object, the present invention takes following technical scheme: a kind of lightning arrester various waveform aging test device, it comprises many baking ovens, Waveform Generator, analogue means and TT﹠C system back-to-back, it is characterized in that: Waveform Generator and back-to-back the plurality of voltages signal that sends of analogue means introduce baking oven by the high-voltage connection cable; Voltage divider and sample resistance are installed in outside the baking oven, and voltage divider is connected in parallel on test product two ends in the baking oven by cable, and sample resistance is connected with the test product in the baking oven; TT﹠C system utilizes capture card to gather current waveform and voltage waveform on sample resistance and the voltage divider respectively.
The AC and DC signal waveform of described Waveform Generator output, the switching between different wave is controlled by switch.
The present invention is owing to take above technical scheme, and it has the following advantages: 1, the present invention is with baking oven, Waveform Generator, module such as analogue means, TT﹠C system is carried out comprehensive exploitation back-to-back, integral device had carry out the ability of compbined test.2, the present invention imports electric current in the test product and the multiple voltage waveform that bears in the computing machine by the waveform acquisition system, calculates data such as test product power consumption by mathematical analysis, carries out the synthetic study of the accelerated aging test method of AC/DC arrester.
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the present invention includes: three baking ovens, Waveform Generator, analogue means back-to-back, TT﹠C system.Waveform Generator and back-to-back analogue means by multichannel high-voltage connection cable voltage signal is introduced baking oven, be applied on the test product (section of an arrester).Baking oven heats test product simultaneously, simulation actual motion environment.Voltage divider R
2With sample resistance R
1Be installed in outside the baking oven voltage divider R
2Be connected in parallel on test product two ends in the baking oven, sample resistance R by cable
1Connect with the test product in the baking oven.It is master control set that TT﹠C system adopts computing machine, gathers sample resistance R respectively by the computer control capture card
1With voltage divider R
2On signal waveform, again electric current in the test specimen and the voltage waveform that bears thereof are input in the computing machine, calculate the parameters such as power consumption of test specimen by mathematical analysis.Simultaneously, the switching operation that TT﹠C system is removed pilot relay by computer control Programmable Logic Controller (PLC) is applied to waveform on the test product with switching.Further going the switching operation of pilot relay again by computer control capture card and the Programmable Logic Controller that computerizeds control (PLC) in the TT﹠C system all is mature technologies of this area, is not described in detail in this.
When test unit is checked the direct current lightning arrester or exchanged the aging characteristics of lightning arrester, need different waveforms to carry out.Waveform Generator is output 27 tunnel signal waveforms at most, provide voltage signal to baking oven respectively according to certain combination.15 road waveforms are wherein arranged,, therefore do not need special setting, directly draw and get final product from alternating current source because it is common interchange output fully.As shown in Figure 2, be the generation circuit of all the other 12 road signals, wherein AC is an alternating-current voltage source, and the tested sample is connected between the output point 1,2, passes through K switch
4Folding respectively with rectification silicon stack D
4With filter capacitor C place in circuit, control 1,2 output waveform with this.Its control mode is as follows:
Work as K
4During disconnection, 1-2 exports current waveform in full-wave rectifier, during the power frequency positive half-wave, and D
4Place in circuit, direction of current: AC-〉D
4-AC; When power frequency is born half-wave, D
3Place in circuit, direction of current: AC-〉D
Work as K
3During disconnection, 1-2 exports dc waveform, and the same full-wave rectification of rectification silicon stack duty just inserts filter capacitor C at circuit output end.
Work as K
4During disconnection, 1-2 exports half wave rectification wave, during the power frequency positive half-wave, has only D
1Place in circuit, direction of current: AC-〉D
Work as K
4Disconnect, 1-2 output power frequency waveform, rectification silicon stack and filter capacitor are not worked.
As shown in Figure 3, analogue means can obtain from prior art back-to-back, and it exports 9 road voltage signals at most, and different voltage signals offers baking oven respectively according to certain combination.Alternating voltage is added on the pressure regulator and converter power transformer of analogue means back-to-back, through the converter valve group of overcommutation side and inversion side at the different waveform voltage signal of difference output.Wherein: A, L point is drawn the continuous running voltage signal of analog valve lightning arrester; B, K point is drawn the continuous running voltage signal of analog DC mid point bus lightning arrester; D, F point is drawn the continuous running voltage signal of simulation transverter DC bus arrester; C, G point is drawn stack commutation angle waveform signal on the power frequency waveform; The E point is drawn the continuous running voltage signal of analog DC bus lightning arrester.
Comprehensive simulation of the present invention the lightning arrester complicacy and the diversity of bearing working voltage, have outstanding meaning for the unified standard that proposes a direct current lightning arrester accelerated aging test.