CN204129111U - The real-time measurement apparatus of electrodes in mine hot stove electric current - Google Patents

Abstract

The utility model discloses a kind of real-time measurement apparatus of electrodes in mine hot stove electric current, comprise the six Roots's coils being sleeved on three-phase transformer Same Name of Ends, article six, Roots's coil superposes between two according to short net connection order, wherein two different name ends of every two Roots's coils connect concurrent, and two other different name end remaining connects with an isolating transmitter input end; Described isolating transmitter is connected with computing machine respectively by A/D sampling plate.The utility model has the advantages that: by installing two Roots's coils respectively on each phase Same Name of Ends copper pipe of the short net of mineral hot furnace main-transformer secondary side, measure the voltage signal of three-phase transformer secondary side six groups of copper pipe Same Name of Ends respectively, then according to short net connection order, successively six Roots's coil signals are carried out overlap-add procedure and become three signals, after conversion process, calculate current signal.Measurement result is more accurate, controls three-phase electrode acting accordingly, thus reduces melting electric consumption.

Description

The real-time measurement apparatus of electrodes in mine hot stove electric current

Technical field

The utility model relates to a kind of real-time measurement apparatus of electrodes in mine hot stove electric current.

Background technology

Mineral hot furnace, belong to the one of electric arc furnaces series, the product smelted is calcium carbide, ferroalloy, yellow phosphorus, the core theory that it is smelted is: three-phase electrode inserts in furnace charge, furnace charge connects electrode and forms branch current preheating furnace charge, electrode tip forms directed High temperature ion stream-electric arc to molten bath electric discharge, converts electric energy to heat energy, for reduction reaction provides sufficiently high temperature field.

Can the Measurement accuracy of electrode current be one of the key factor that well run of mineral hot furnace.In smelting process, along with the continuous rising of furnace bottom bath surface (or top of the slag), furnace charge is regular to be stayed, electrode tip because of scaling loss on move and the change of molten bath electric conductivity, need the physical location of adjustment electrode in good time, all the time optimum condition can be in keep arc power in stove, also want to keep the arc length of three-phase (six phases) electrode arc substantially identical simultaneously, identical arc power is discharged to maintain three-phase (six phases) electrode, keep the reduction reaction region of formed objects, enable the higher electrical efficiency that electric power system reaches simultaneously, one of key reaching this object is exactly the size of electrode current and balances the requirement wanting to meet smelting.

In mine heat furnace smelting process, usually at mineral hot furnace main-transformer primary side, current transformer is installed and measures primary side current, site operation personnel relies on artificial experience, and according to primary side current size and watt level, lifting electrode lift position is carried out mine heat furnace smelting and run control.A, B, C three-phase of mineral hot furnace primary side and A, B, C three-phase of secondary side are not relations one to one, A, B two-phase of the corresponding secondary side of A of primary side, B, C two-phase of the corresponding secondary side of B of primary side, C, A two-phase of the corresponding secondary side of C of primary side.Gained signal measured by the current transformer installed at primary side A, B, C threephase cable place, primary side single-phase current size can be calculated, there is certain uncertain proportionate relationship (only when primary side and secondary side three-phase electrode electric current and electrode power complete equipilibrium in this electric current and secondary side electrode current, just there is fixing proportionate relationship), accurately can not calculate the size of secondary side three-phase electrode electric current.

Measurement accuracy electrodes in mine hot stove electric current is one of hope in the industry always, but, because ore furnace secondary side copper pipe is arranged and the restriction of trend, with Roots's coil, the whole copper pipe covers on same electrode cannot be worn together; Many the copper pipes that same electrode connects, respectively from the non-same polarity of different two phase windings of secondary side, and electric current, voltage-phase difference 60 degree, simply can not be added process, and vector superposed process must be carried out, electrode current value can be processed out.

Utility model content

The utility model overcomes shortcoming of the prior art, provide a kind of real-time measurement apparatus of electrodes in mine hot stove electric current, by installing six big current Roots coils at ore heat furnace transformer secondary side copper pipe, again Roots's coil output signal is carried out overlap-add procedure between two, process is calculated to be three-phase electrode electric current, again by industrial control system controlling of sampling, thus reach the operational efficiency improving mineral hot furnace, reduce melting electric consumption, improve the object of output, efficiently solve the deficiency relying on the lifting of primary side current control electrode.

The technical solution of the utility model is: a kind of real-time measurement apparatus of electrodes in mine hot stove electric current, comprise the six Roots's coils being sleeved on A, B, C phase transformer Same Name of Ends, described six Roots's coils superpose between two according to short net connection order, wherein two different name ends of every two Roots's coils connect concurrent, and two other different name end remaining connects with an isolating transmitter input end; Described isolating transmitter is connected with computing machine respectively by A/D sampling plate.

Compared with prior art, the utility model has the advantages that: the electric current of electrodes in mine hot stove is measured in real time, be adopt to install current transformer additional at the primary side (high-pressure side) of mineral hot furnace main-transformer and measure primary side current, then the no-load voltage ratio being multiplied by transformer is to calculate electrode current always.The electrode current that this kind of method calculates is only approximate value, and error is comparatively large, and error is up to more than 10%.Connect because the short net wiring of the secondary side of mineral hot furnace is triangle, A, B, C of A, B, C three-phase electrode that secondary side is formed and the three-phase supply of primary side are not relations one to one, simultaneously, alternate power transfer is also there is between secondary side three-phase electrode, so the instantaneous value accurately measuring electrodes in mine hot stove electric current needs new measurement mechanism and method.Only have Measurement accuracy electrode current value, and the correct three-phase electrode that controls does work, and could meet the requirement of smelting.

The utility model by installing two big current (referring generally to more than 10KA) Roots coils respectively on each phase Same Name of Ends copper pipe of the short net of mineral hot furnace main-transformer secondary side, measure the voltage signal of three-phase transformer (or three single transformers) secondary side six groups of copper pipe Same Name of Ends respectively, then according to short net connection order, successively six Roots's coil signals are carried out overlap-add procedure and become three signals, after amplifier process, send computer A/D plate process.The current signal that obtains of measurement, can accurately record three-phase electrode size of current according to this, controls three-phase electrode acting accordingly, thus reaches the operational efficiency improving mineral hot furnace, reduce melting electric consumption, improve the object of output.

Accompanying drawing explanation

The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:

Fig. 1 is the structural representation of the real-time measurement apparatus of electrodes in mine hot stove electric current;

Fig. 2 is the laying schematic diagram of big current Roots coil.

Embodiment

A kind of real-time measurement apparatus of electrodes in mine hot stove electric current, as shown in Figure 1, comprise: A phase transformer 1, B phase transformer 2, C phase transformer 3, 1# Roots coil 4, 2# Roots coil 5, 3# Roots coil 6, 4# Roots coil 7, 5# Roots coil 8, 6# Roots coil 9, A phase electrode 10, B phase electrode 11, C phase electrode 12, A phase " a " copper pipe 13, A phase " x " copper pipe 14, B phase " b " copper pipe 15, B phase " y " copper pipe 16, C phase " c " copper pipe 17, C phase " z " copper pipe 18, 1# Roots coil and 6# Roots coil signal line contact 19, 2# Roots coil and 3# Roots coil signal line contact 20, 4# Roots coil and 5# Roots coil signal line contact 21 etc., wherein:

1# Roots coil 4 wears whole copper pipes 13 of the mark " a " of A phase transformer 1; 2# Roots coil 5 wears whole copper pipes 14 of the mark " x " of A phase transformer 1; 3# Roots coil 6 wears whole copper pipes 15 of the mark " b " of B phase transformer 2; 4# Roots coil 7 wears whole copper pipes 16 of the mark " y " of B phase transformer 2; 5# Roots coil 8 wears whole copper pipes 17 of the mark " c " of C phase transformer 3; 6# Roots coil 9 wears whole copper pipes 18 of the mark " z " of C phase transformer 3, as shown in Figure 2.

As shown in Figure 1, the different name end of the signal wire of 1# Roots coil 4 and 6# Roots coil 9 connects concurrent 19, make two Roots's coil signals form coupled in series, two other different name end remaining, as the ac voltage signal Va of A phase electrode 10, exports to the isolating transmitter input end of A phase electrode 10; Similar connection, connects 2# Roots coil 5 and 3# Roots coil 6 one-tenth contacts 20, as the ac voltage signal Vb of B phase electrode 11, exports to the isolating transmitter input end of B phase electrode 11; Connect 4# Roots coil 7 and 5# Roots coil 8 one-tenth contacts 21, as the ac voltage signal Vc of C phase electrode 12, export to the isolating transmitter input end of C phase electrode.

Three isolating transmitters export after three road signals carry out analog to digital conversion to A/D sampling plate respectively, and input computing machine carries out processing and computing, and computer control system software accordingly signal magnitude wiring mineral hot furnace controls automatically, reaches energy-saving and cost-reducing object.

Claims (2)

1. the real-time measurement apparatus of an electrodes in mine hot stove electric current, it is characterized in that: comprise the six Roots's coils being sleeved on A, B, C phase transformer Same Name of Ends, described six Roots's coils superpose between two according to short net connection order, wherein two different name ends of every two Roots's coils connect concurrent, and two other different name end remaining connects with an isolating transmitter input end; Described isolating transmitter is connected with computing machine respectively by A/D sampling plate.

2. the real-time measurement apparatus of electrodes in mine hot stove electric current according to claim 1, is characterized in that: the suit mode of described six Roots's coils is: 1# Roots coil wears whole copper pipes of the mark " a " of A phase transformer; 2# Roots coil wears whole copper pipes of the mark " x " of A phase transformer; 3# Roots coil wears whole copper pipes of the mark " b " of B phase transformer; 4# Roots coil wears whole copper pipes of the mark " y " of B phase transformer; 5# Roots coil wears whole copper pipes of the mark " c " of C phase transformer; 6# Roots coil wears whole copper pipes of the mark " z " of C phase transformer.