CN2311873Y - Electric dewatering automatic switching control cabinet - Google Patents

Abstract

The utility model relates to a voltage and current automatic control converter. An electric control and a main loop control are respectively connected with a current limiting constant current phase conversion. When the constant current flows by, the protection is respectively connected with the main loop control and a constant current limiting phase conversion, a voltage feedback and a current feedback are respectively connected with the electric control, and an overvoltage protection is connected with the main loop. The utility model has the advantages that the input and output voltage and current have the same wave shape, extraordinary wave and harmonic wave don't appear, the dewatering quality can be improved, and the circuit can be automatically converted according to the load during the operation, so the utility model is safe, without burning appliances. The voltage and current automatic control converter is adapted to crude oil dewatering and desalting processing or dust removal automatic control.

Description

The automatic conversion and control cabinet of electric dehydration

The utility model relates to a kind of voltage, electric current automatic control equipment.

At present in the oil field or oil plant employed power control when carrying out the dehydration of crude oil,, but still there are some problems though its effect was had taken great strides in one's progress than in the past.As when having served as the carrying row, the phenomenon that burns out parts is often arranged.Because wherein some circuit and parts criteria of right and wrong part thereof, quality does not pass a test, and burns out easily yet, and power output is restricted.Because this power control is to adopt electric capacity Control current, voltage method when normal operation, cause the output waveform less stable, and produce harmonic wave, influence the quality of the dehydration of crude oil, and also can often burn out electric capacity and cause maintenance load big, the maintenance cost height.

The purpose of this utility model provides the automatic conversion and control cabinet of a kind of crude oil electric dewatering, it has normal operation circuit and abnormal running circuit, and can change automatically, thereby reach stable, the purpose of fragile component not, reduce maintenance load, reduce maintenance cost, prolong life cycle, and can realize energy-efficient purpose.

The technical solution of the utility model is to realize like this, the automatic conversion and control cabinet of a kind of electric dehydration, by shell and within it electric control system, major loop control section, voltage feedback section etc. are installed form, its special character is, (1) electric control system, major loop control section are connected with current limliting constant current conversion portion respectively, and the output of current limliting constant current conversion portion is the output of this control cubicle; (2) the out-of-date protection part of constant current is connected with current limliting constant current conversion portion, major loop control section respectively, behind the constant current state operation certain hour, stops main circuit power supply; (3) the overvoltage protection part is connected with major loop control section and output respectively, in time cuts off the purpose of major loop during with realization output voltage overrate; (4) the current feedback part is connected with electric control system and output respectively, to realize sending current signal to electric control system; (5) voltage feedback section is connected with electric control system and output respectively, to realize sending voltage signal to electric control system.

In technique scheme, its special character also is, (1) the major loop control section is connected with voltage relay normally-closed contact 2YJ1, time relay normally-closed contact 2SJ1, start button HA, stop button TA successively by contactor pull-in winding 1CJ, be connected on the two ends of incoming line, normally opened contact 1CJ3 and button HA parallel connection, the main contact 1CJ1 1CJ2 of contactor is connected in two incoming lines; (2) electric control system is connected with normally-closed contact 5CJ1 by the pull-in winding of contactor 2CJ, the pull-in winding of contactor 3CJ is connected with normally opened contact 5CJ2, the pull-in winding of contactor 4CJ and normal opened contact 3CJ3, the normally opened contact 1SJ1 of the time relay is connected, the pull-in winding of contactor 5CJ and normally-closed contact 6CJ1, the normally opened contact AJ1 of current relay is connected, normally opened contact 5CJ3 and AJ1 parallel connection, the normally opened contact 1YJ1 of the pull-in winding of contactor 6CJ and voltage contactor is connected, time relay 1SJ is connected with normally opened contact 5CJ4, contactor 2CJ, 3CJ, 4CJ, 5CJ, 6CJ, and the other end of time relay 1SJ is imported an end with voltage and is connected contact 5CJ1,5CJ2,1SJ1, AJ1,5CJ3,1YJ1, the other end of 5CJ4 is connected with another Input voltage terminal and forms; (3) current limliting constant current conversion portion is linked together by main contact 3CJ1, the 3CJ2 of contactor by inductor 1L, 2L, contact 2CJ2 is connected between contact A3, the A5, the end of contact 2CJ1 is connected in contact A6, the other end is connected in contact A4, capacitor C 1, C2, C3 are in parallel with resistance R 1, R2, R3 respectively, and one is terminated at contact B2, and the other end is connected with contact 4CJ1,4CJ2,4CJ3 respectively, contact 4CJ1,4CJ2,4CJ3 link together, and are connected with contact A4 and form; (4) current feedback part is made up of the current relay AJ and the ammeter 1A that are installed in the current transformer 1AL on the input lead and are installed in its two ends.(5) after voltage feedback section is connected by the normally-closed contact 2CJ3 of voltage relay 1YJ and contactor, is connected on contact A6, B6 and constitutes; (6) after overvoltage protection part is connected by the normally opened contact 4CJ4 of voltage relay 2YJ and contactor, is connected on contact A6, B6 and forms; (7) the out-of-date protection part of constant-current source is connected by the normally opened contact 4CJ4 of time relay 2SJ and contactor, is connected between the contact 101,201, and the normally opened contact 5CJ5 of contactor is connected with electric bell, is connected between the contact 101,201 and forms.

The utility model has the advantages that, (1) under nominal situation in the circuit in when operation without electric capacity, the inductance value during electric current output is very little, the voltage of therefore input, output, current waveform one to, extraordinary wave and harmonic wave can not occur, help guaranteeing the dehydration quality like this.When (2) under improper operating mode, moving, during as overload or short circuit, in time change-over circuit increases the circuit inductance amount, and forms constant-current source output with electric capacity, output voltage can be reduced to the 200--0V arbitrary value according to load,,, can not damage energising equipment as surpassing time (as 4 hours) the meeting autostop of adjusting, the effect of safety electricity-saving can be played, maintenance load and maintenance cost can be reduced; (3) easy and simple to handle; (4) unit in the circuit, device all adopt the electric elements of standard, and be not fragile, is suitable for using under the adverse circumstances, draws materials conveniently, is convenient to maintenance, is convenient to promote.

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is a circuit connection diagram of the present utility model.

Be described further (embodiment) below in conjunction with accompanying drawing:

The AC supply voltage of two-phase 380V is received on lead-in clamp A, the B of this control cubicle, automatic air-break switch ZK is connected on the input lead, automatic switch protective current setting value is adjusted to the 60A take-off.Two main contact terminal A1, the B1 of automatic switch ZK are connected by main contact 1CJ1, the 1CJ2 of lead with high power AC contactor 1CJ respectively, one end and the input lead of contactor 1CJ pull-in winding are connected to B1, the other end is connected with door switch MA, voltage relay normally-closed contact 2YJ1, time relay normally-closed contact 2SJ1, start button HA, stop button TA successively, be connected to A1 by fuse RD and input lead, the major loop control section is formed in normally opened contact 1CJ3 and button HA parallel connection.Electric control system is connected by the pull-in winding of high power AC contactor 2CJ and the normally-closed contact 5CJ1 of small-power A.C. contactor 5CJ (can select CJ10-10 for use), the pull-in winding of high power AC contactor 3CJ is connected with the normally-closed contact 5CJ2 of small-power A.C. contactor 5CJ, high power AC contactor 4CJ (1CJ, 2CJ, 3CJ, 4CJ all can select the contactor of CJ20-63A for use) pull-in winding and the normal opened contact 3CJ3 of contactor 3CJ, the normally opened contact 1SJ1 of time relay 1SJ is connected, the normally-closed contact 6CJ1 of the pull-in winding of contactor 5CJ and contactor 6CJ, the normally opened contact AJ1 of current relay AJ is connected, the normally opened contact 5CJ3 of contactor 5CJ and normally opened contact AJ1 parallel connection, the normally opened contact 1YJ1 of the pull-in winding of contactor 6CJ and voltage contactor 1YJ is connected, time relay 1SJ (band on-off switch 1K) is connected with the normally opened contact 5CJ4 of contactor 5CJ, contactor 2CJ, 3CJ, 4CJ, 5CJ, the other end of 6CJ and switch 1K is connected with power input B1, contact 5CJ1,5CJ2,1SJ1, AJ1,5CJ3,1YJ1, the other end of 5CJ4 is connected with power input A1 by fuse RD, form electrical control part, time relay 1SJ is under constant current state, time-delay drops into electric capacity, purpose is for avoiding controlled device generation flashover electric discharge phenomena, and cut-off switch 1K uses when the big inductance quantity current limliting, and its current limliting is output as 10--20A.Current limliting constant current conversion portion is linked together by main contact 3CJ1, the 3CJ2 of contactor 3CJ by inductor 1L, 2L, contact 2CJ2 is connected between contact A3, the A5, the end of contact 2CJ1 is connected in contact A6, the other end is connected in contact A4, capacitor C 1, C2, C3 (can select for use large bulk capacitance as 160 f * 3-1000VAC) respectively with resistance R 1, R2, R3 mutually and connect, one is terminated at contact B2, and the other end of contact 4CJ1,4CJ2,4CJ3 links together, and is connected with contact A4.Current feedback part is made up of the current relay AJ and the ammeter 1A that are installed in the current transformer 1AL on the input lead and are installed in its two ends, when setting current is 40A, less than 40A is operate as normal, regulates output for current limliting, and voltage is 380--360V, and during greater than 40A, be non-normal working, the constant flow regulation output current is 26--30A, and voltage is 200--0V, at this moment input current is very little, reaches purpose of energy saving.After voltage feedback section is connected by the normally-closed contact 2CJ3 of voltage relay 1YJ (0--450V) and contactor 2CJ, be connected on contact A6, B6 and constitute, when output voltage returns to rated value gradually, during as 300V, can make constant current output be converted to current limliting output, operate as normal.Overvoltage protection part is connected between contact A6, the B6 after being connected by the normally opened contact 4CJ5 of voltage relay 2YJ and contactor 4CJ, shunt voltage table 2V (0--500V) and constituting.The out-of-date protection part of constant-current source is connected by the normally opened contact 4CJ4 of time relay 2SJ and contactor 4CJ; be connected between the contact 101,201; the normally opened contact 5CJ5 of contactor 5CJ is connected by switch 2K with electric bell JL; be connected between the contact 101,201, between contact 111 and 201, meet indicator light JD and form.Above-mentioned unit, device are fixedly mounted on the circuit board, and connect, circuit board is fixed in the control cubicle, voltmeter, ammeter, indicator light, control switch etc. are installed on the control cubicle shell with lead.

Claims (2)

1. automatic conversion and control control cubicle of electric dehydration by shell and within it electric control system, major loop control section, voltage feedback section etc. are installed form, is characterized in that:

(1) electric control system, major loop control section are connected with current limliting constant current conversion portion respectively, and the output of current limliting constant current conversion portion is the output of this control cubicle; (2) the out-of-date protection part of constant current is connected with current limliting constant current conversion portion, major loop control section respectively, behind the constant current state operation certain hour, stops main circuit power supply; (3) the overvoltage protection part is connected with major loop control section and output respectively, in time cuts off the purpose of major loop during with realization output voltage overrate; (4) the current feedback part is connected with electric control system and output respectively, to realize sending current signal to electric control system; (5) voltage feedback section is connected with electric control system and output respectively, to realize sending voltage signal to electric control system.

2. electric dehydration according to claim 1 is changed cabinet automatically, it is characterized in that: (1) major loop control section is connected with voltage relay normally-closed contact 2YJ1, time relay normally-closed contact 2SJ1, start button HA, stop button TA successively by contactor 1CJ pull-in winding, be connected on the two ends of incoming line, main contact 1CJ1, the 1CJ2 of normally opened contact 1CJ3 and button HA contactor in parallel are connected in two incoming lines; (2) electric control system is connected with normally-closed contact 5CJ1 by the pull-in winding of contactor 2CJ, the pull-in winding of contactor 3CJ is connected with normally opened contact 5CJ2, the pull-in winding of contactor 4CJ and normal opened contact 3CJ3, the normally opened contact 1SJ1 of the time relay is connected, the pull-in winding of contactor 5CJ and normally-closed contact 6CJ1, the normally opened contact AJ1 of current relay is connected, normally opened contact 5CJ3 and AJ1 parallel connection, the normally opened contact 1YJ1 of the pull-in winding of contactor 6CJ and voltage contactor is connected, time relay 1SJ is connected with normally opened contact 5CJ4, contactor 2CJ, 3CJ, 4CJ, 5CJ, 6CJ, and the other end of time relay 1SJ is imported an end with voltage and is connected contact 5CJ1,5CJ2,1SJ1, AJ1,5CJ3,1YJ1, the other end of 5CJ4 is connected with another Input voltage terminal and forms; (3) current limliting constant current conversion portion is by inductor 1L, 2L is by the main contact 3CJ1 of contactor, 3CJ2 links together, contact 2CJ2 is connected contact A3, between the A5, the end of contact 2CJ1 is connected in contact A6, the other end is connected in contact A4, capacitor C 1, C2, C3 respectively with resistance R 1, R2, R3 is in parallel, one is terminated at contact B2, the other end respectively with contact 4CJ1,4CJ2,4CJ3 is connected, 4CJ1,4CJ2, the 4CJ3 other end links together, and be connected with contact A4 and form, (4) current feedback part is made up of the current relay AJ and the ammeter 1A that are installed in the current transformer 1AL on the input lead and are installed in its two ends; (5) after voltage feedback section is connected by the normally-closed contact 2CJ3 of voltage relay 1YJ and contactor, is connected on contact A6, B6 and constitutes; (6) after overvoltage protection part is connected by the normally opened contact 4CJ4 of voltage relay 2YJ and contactor, is connected on contact A6, B6 and forms; (7) the out-of-date protection part of constant-current source is connected by the normally opened contact 4CJ4 of time relay 2SJ and contactor, is connected between the contact 101,201, and the normally opened contact 5CJ5 of contactor is connected with electric bell JL, is connected between the contact 101,201 and forms.

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