CN2258311Y

CN2258311Y - Current transformer with voltage extractor

Info

Publication number: CN2258311Y
Application number: CN 95245512
Authority: CN
Inventors: 王德忠; 郭天兴; 陈力渊
Original assignee: XI'AN ELECTRIC POWER CAPACITORS FACTORY
Current assignee: XI'AN ELECTRIC POWER CAPACITORS FACTORY
Priority date: 1995-10-06
Filing date: 1995-10-06
Publication date: 1997-07-23
Anticipated expiration: 2005-10-06

Abstract

The utility model relates to a current transformer with a voltage extractor for the purpose that a capacitor voltage transformer and a current transformer are combined into a whole organically to prevent self explosion and save materials and other expenses. The current transformer with a voltage extractor has the structure that a secondary coil 5 of the current transformer, and an electromagnetic device 6 are arranged in an oil tank body 7; the upper end of a sleeve pipe 4 arranged on the oil tank body 7 is assembled with a porcelain tank cap 2 and an expander 1; primary conducting wires L1, L2 penetrate through the secondary coil 5; a lead wire 11 of the electromagnetic device is connected with the nodes of capacitors C3, C2. The current transformer with a voltage extractor has the advantages that original functions can be completed; the self explode can be prevented effectively; the land occupation expenditure, the capital expenditure, and the cost expenditure in the construction of electric force are saved.

Description

The current transformer that has capacitor-voltage detecting device

The utility model relates to ultra-high-tension power transmission line, power station, transformer station etc. to be measured to big electric current with to system voltage, and to the checkout equipment that electric power system fault is protected, refers to have the current transformer of capacitor-voltage detecting device especially.

In background technology, in the market in the capacitance type potential transformer of Xiao Shouing, referring to Fig. 3, connect calutron between the capacitor C 1 of series connection and the C2, in this calutron, transformer T is simple to be connect between capacitor C 1 and the C2 through compensation reactor D, and the earth is inserted in the simple other end of transformer T and capacitor C 2 lower ends, T level of transformer secondary coil exit a1, X ₁, a ₂, X ₂, a wherein ₂And X ₂Between connect damper Z, this capacitance type potential transformer is finished voltage measurement and system protection function.In the current transformer of selling in addition on the market, referring to Fig. 4, one time lead L1L2 passes through secondary coil, capacitor C 3 upper ends connect a lead L1, lower end ground connection, and capacitor C 1 is as capacitance plate, the main uniform and reduction effect of electric field of voltage that rises, entire equipment is finished and is measured big current work.Because above-mentioned two kinds of autonomous devices are finished function separately, so investment is bigger, using needs two groups of personnel operation, and operating efficiency is lower.

The purpose of this utility model is a kind of current transformer that has capacitor-voltage detecting device of development, the capacitance type potential transformer summation current transformer is organically combined, not only finish original function separately, but also to finish the function that prevents that self from exploding, increase work efficiency, reduce some parts, save the cost expenditure and expend with other.

Technical solution of the present utility model is as follows:

The current transformer that has capacitor-voltage detecting device, be included in assembling Current Transformer Secondary coil 5 in the oil box 7, secondary coil 5 lead-out wires insert in the instrument transformer secondary outlet box 8, insulating sleeve 4 upper ends assembling magnetic case cap 2 on the oil box 7, assembling expander 1 above the porcelain box cap 2, a lead L1L2 in the porcelain box cap 2 is by insulating sleeve 4 and secondary coil 5, be characterized in, in oil box 7, voltage transformer calutron 6 lead-out wires 11 of assembling connect the capacitor voltage divider of being made up of capacitor C 3 and C2, and the voltage transformer secondary adjustment terminal board 9 of adjusting voltage measurement precision and each technical parameter is assemblied in oil box 7 one sides.

Technical solution of the present utility model also comprises:

In calutron 6, to meet voltage indicating device transformer T through compensation reactor D simple for node between capacitor C 3 and the C2, and T level of transformer lead-out wire is capacitor-voltage detecting device secondary coil a ₁, X ₁, a ₂, X ₂, a wherein ₂And X ₂Between connect damper Z.

A lead L1L2 is by the Current Transformer Secondary coil in the paper oil insulation current transformer, and this secondary coil lead-out wire is 1K1,1K2,2K1,2K2, and 3K1,3K2, a lead L1L2 in insulating sleeve 4 is wrapped with capacitance plate C3.

Description of drawings of the present utility model is as follows:

Fig. 1 is the overall structure schematic diagram.

Fig. 2 is a structure cutaway view of regulating end tab 12 among Fig. 1.

Fig. 3 is former capacitance type potential transformer schematic diagram.

Fig. 4 is a primary current instrument transformer schematic diagram.

Fig. 5 is the current transformer schematic diagram that has capacitor-voltage detecting device.

Above-mentioned number in the figure is described as follows:

The 1-expander, the 2-porcelain box cap, lead of 3-current transformer, 4-insulating sleeve, 5-Current Transformer Secondary coil, 6-voltage transformer calutron, 7-oil box, 8-instrument transformer secondary outlet box, the 9-voltage transformer secondary is adjusted terminal board, the low-voltage arm C2 of 10-capacitor voltage divider, the lead-out wire of 11-voltage transformer calutron, 12-regulates end tab, press among the 13-and draw guide rod, 14-regulates leading-out terminal, 15-epoxy casting plate, the high-voltage arm of C1-capacitor voltage divider, the low-voltage arm of C2-capacitor voltage divider, the D-compensation reactor, T-voltage indicating device transformer, Z-damper.

Be that the utility model adjoint is described in further detail below: referring to Fig. 1, based on the paper oil insulation current transformer, the capacitance plate C3 of Current Transformer replaces the voltage-dividing capacitor C1 of former capacitance type potential transformer, in the fuel tank of its underpart, be equipped with necessary calutron again, form the current transformer that has capacitor-voltage detecting device.Assembling Current Transformer Secondary coil 5 and voltage transformer calutron 6 in oil box 7, the lead-out wire 11 of this calutron 6 connects the low-voltage arm C2 (10) of capacitor voltage divider and the node of high-voltage arm C3.Insulating sleeve 4 upper ends above the oil box 7 are porcelain box cap 2 fixedly, assembling expander 1 on the porcelain box cap 2, this expander 1 main rising guarantees entire product inside slight positive pressure state, with prevent parts make moist, impaired.Lead L1L2 of current transformer in porcelain box cap 2 is by insulating sleeve 4 summation current transformer secondary coils 5, exit 1K1, the 1K2 of this secondary coil 5,2K1,2K2,3K1,3K2 are assemblied in the oil box 7 one side instrument transformer secondary outlet boxes 8, are connected with devices such as measuring instrument, relays.Secondary coil exit a in voltage transformer calutron 6 ₁, X ₁, a ₂, X ₂Be assemblied in oil box 7 opposite side voltage transformer secondaries and adjust in the terminal board 9, adjust voltage measurement precision and each technical parameter.Referring to Fig. 2, this is that voltage transformer secondary is adjusted the adjustment end tab 12 in the terminal board 9, these end tab 12 usefulness screws are fixed in the terminal board 9, assembling adjusting leading-out terminal 14 and middle pressure are drawn guide rod 13 on epoxy casting plate 15, wherein middle pressure is drawn guide rod 13 and is connected do experiment usefulness with calutron 6 lead-out wires 11, the precision adjustment coil of regulating leading-out terminal 14 and calutron 6 links to each other, and carries out the voltage accuracy adjustment.Referring to Fig. 3, this is former capacitance type potential transformer schematic diagram, and the simple upper end of transformer T is connected on capacitor C 1 and the C2 node through compensation reactor D in its calutron 6, and ground is also inserted in lower end and capacitor C 2 lower ends, T level of transformer secondary coil exit a ₁, X ₁, a ₂, X ₂, a wherein ₂, X ₂Between connect damper Z, its capacitor C 1 and C2 make voltage divider usefulness, are used for voltage measurement and protection.Referring to Fig. 4, this is a primary current instrument transformer schematic diagram, and capacitor C 3 is a capacitance plate; L1L2 is that a lead is by Current Transformer Secondary coil 5, its exit 1K1,1K2,2K1,2K2; 3K1,3K2 are used for current measurement, again system are carried out transient state and stable state protection.Referring to Fig. 5; this is a structure principle chart of the present utility model; in primary current instrument transformer structure, add capacitor C 2 and voltage transformer calutron 6; capacitor C 2 is the capacitance partial pressure low-voltage arm; its upper end connects high-voltage arm capacitance plate C3 and compensation reactor D; its lower end connects that transformer T is simple to go into ground; whole operation principle is like this; lead L1 and L2 are serially connected on the tested electric power system line; electric current by 5 pairs of electric power systems of Current Transformer Secondary coil is measured, and the while is also carried out transient state and stable state protection to the electric current of whole system.And the secondary coil in the voltage transformer calutron 6 carries out voltage measurement simultaneously, and whole system voltage is carried out transient state and voltage-stabilizing protection.

Advantage of the present utility model and effect are as follows:

1, owing to the capacitance type potential transformer summation current transformer is integrated, so saved the capacitor voltage divider part and a cover seal of former capacitance type potential transformer, in power construction, saved occupation of land and capital cost, and the spending of material cost.

2, the utility model can be measured simultaneously to current and voltage signals, simultaneously the electric current and voltage of whole system is carried out transient state and stable state protection again, and the trouble of having avoided original needs to detect has respectively improved operating efficiency.

3, paper oil insulation current transformer explosion accident in system in recent years is a lot of, and the utility model utilizes its voltage to make protection usefulness, and when capacitance plate had problem, the variation of its voltage can reflect from voltage, by secondary coil lead-out wire a ₁, X ₁, a ₂, X ₂Directly drive relay system and protect action, make the current transformer accident of can not blasting, this effect that prevents self blast is the utility model biggest advantage.

Claims

1, the current transformer that has capacitor-voltage detecting device, be included in assembling Current Transformer Secondary coil (5) in the oil box (7), secondary coil (5) lead-out wire inserts in the instrument transformer secondary outlet box (8), insulating sleeve (4) upper end assembling magnetic case cap (2) on the oil box (7), assembling expander (1) above the porcelain box cap (2), a lead L1L2 in the porcelain box cap (2) is by insulating sleeve (4) and secondary coil (5), it is characterized in that: in oil box (7), voltage transformer calutron (6) lead-out wire (11) of assembling connects the capacitor voltage divider of being made up of capacitor C 3 and C2, and the voltage transformer secondary adjustment terminal board (9) of adjusting voltage measurement precision and each technical parameter is assemblied in oil box (7) one sides.

2, the current transformer that has capacitor-voltage detecting device according to claim 1, it is characterized in that: in calutron (6), to meet voltage indicating device transformer T through compensation reactor D simple for node between capacitor C 3 and the C2, and T level of transformer lead-out wire is capacitor-voltage detecting device secondary coil a ₁, X ₁, a ₂, X ₂, a wherein ₂And X ₂Between connect damper Z.

3, the current transformer that has capacitor-voltage detecting device according to claim 1, it is characterized in that: a lead L1L2 is by Current Transformer Secondary coil (5) in the voltage transformer calutron (6), this secondary coil (5) lead-out wire is 1K1,1K2,2K1,2K2,3K1,3K2, a lead L1L2 in insulating sleeve (4) is wrapped with capacitance plate C3.