CN2802836Y

CN2802836Y - Heavy-current generator

Info

Publication number: CN2802836Y
Application number: CN 200420114077
Authority: CN
Inventors: 朱以俊
Original assignee: Shanghai Meishan Baosteel Group Co Ltd
Current assignee: Shanghai Meishan Baosteel Group Co Ltd
Priority date: 2004-12-13
Filing date: 2004-12-13
Publication date: 2006-08-02
Anticipated expiration: 2014-12-13

Abstract

The utility model relates to a heavy current generator which is composed of a voltage regulator, a transformer, a current transformer, an ammeter and a selective switch, wherein a 220V power supply is sent into the single phase voltage regulator TB which outputs a regulable voltage and sends the regulable voltage into the 220V/36V transformer B; a low voltage reduced by the transformer is sent into the auxiliary side of the current transformer, and the two output ends of the primary side of the current transformer acts as the output end of a heavy current. The utility model has the advantages of simple manufacture, low cost, small size, light weight and convenient carrying, is suitable for being used in a maintenance site and is especially suitable for checking an overcurrent relay and a thermal relay.

Description

Strong current generator

One, technical field

The utility model relates to a kind of current generating apparatus, particularly a kind ofly is used for the current feedback circuit that electrical equipment automatic switch and protection are adjusted.

Two, background technology

Electric equipment generally all should be equipped with overload protection measure and device, and its effect is to be used for the overcurrent of checkout equipment and overheat condition, and the reliability of these checkout gears is extremely important, and the verification utmost point of these protective device operating values is necessary.But because the verification of these devices all need be used strong current generator, and strong current generator is a common apparatus, and 2000～3000A electric current generally can take place, and volume weight is all very big, and price is also high.And general medium and small equipment protecting equipment operating value detects these devices in the factory below 200A, needs small-sized current feedback circuit in the production reality.

Three, summary of the invention

The purpose of this utility model provides a kind of strong current generator, and the technical issues that need to address are: reduce the volume of current feedback circuit, be medium and small device service.For requirements of one's work, we utilize old current transformer to make a strong current generator, and it is light small and exquisite, about operating current 250A.

The technical solution of the utility model is: strong current generator, mainly form by voltage regulator, transformer, current transformer, ammeter, selector switch, single-phase voltage regulating device TB sends into 220 power supplys, its adjustable secondary voltage, send into 220V/36V transformer B, the low-voltage of transformer, send into the secondary of current transformer, two outputs on the former limit of current transformer are as the output of big electric current, according to electromagnetic induction principle, if instrument transformer former limit short circuit is at secondary side input 0～5A electric current, then the primary side short circuit current I of current transformer ₁=N*I ₂, (N is a current transformer ratio) regulates the voltage regulator output voltage, and just can obtain adjustable big electric current, actual measurement: output current can reach about 250A, and electric current can reach 800A during direct short-circuit.

If detected automatic switch or current relay are serially connected in wherein, just can carry out verification to their overcurrent protection operating value.

The beneficial effects of the utility model are:

(1), very practical to verification overcurrent relay, thermal relay, improved the dependability of this type of protection device, avoid artificial blindness adjustment, thereby correctly protect electric equipment, reduce device damage;

(2), make simply, with low cost, volume is little, in light weight, and is easy to carry, is highly suitable for that maintenance is on-the-spot to be used, and has certain popularization value.

Four, description of drawings

Accompanying drawing is the utility model strong current generator electrical schematic diagram

Among the figure: 1-attaching plug, 2-voltage regulator TB, 3-transformer B, 4-fuse RD, 5-selector switch ZK, 6-ammeter A, 7-produce the current transformer 1LH of big electric current, 8-Verification of Measuring Current Transformer 2LH, 9-200A electric current outlet terminal, 10-5A electric current outlet terminal.

Five, embodiment

Consult accompanying drawing, strong current generator comprises by voltage regulator, transformer, current transformer, ammeter, selector switch and forming.Single-phase 220V power supply is sent into the input of single-phase voltage regulating device TB 2 by attaching plug 1, output voltage regulator is received the 220V input of 220V/36V transformer B3, and the secondary 36V output of transformer B, one is connected to a termination of current transformer 1LH 7 secondary, the other end is connected with fuse RD 4, be connected to the K4 contact of selector switch ZK 5 then, be connected to another termination of current transformer 1LH 7 secondary by the K4 contact, two terminations on the former limit of current transformer 1LH 7 are as the big current output terminal of 200A of strong current generator, the connection lead of the big current output terminal of 200A uses Wiring type with the above copper cash of 70mm2, current transformer 1LH 7; And current transformer 2LH 8 can select core-string type or Wiring type for use, when using core-string type, is enclosed within on the big electric current output line of 200A of current feedback circuit, is used to measure the output current of current feedback circuit.Ammeter A6 one is connected to current transformer 2LH 8 outputs one end, and the other end is connected to the current transformer 2LH 8 output other ends by the K1 contact of selector switch ZK.

It is the big electric current output of 200A that this current feedback circuit has 9,10, one groups of two groups of output connection terminations, and one group is the little electric current output of 5A.Switch by selector switch ZK 5, when selecting switch ZK 5 to be chosen in the 5A output current, the K2 of selector switch ZK 5, K3 connect, and the 5A output current is directly powered by the secondary of transformer B3, simultaneously ammeter 6 is directly sealed in, current values is directly read by ammeter 6; When selecting the 200A output current, the K1 of selector switch ZK 5, K4 connect, and the 200A electric current is provided by current transformer 1LH 7 former limits, and the ammeter reading should multiply by the multiplying power of current transformer 2LH 8.The position of selector switch ZK 5 and contact connection situation are shown in Table 1.

Table 1 selector switch ZK connects table

When having listed selector switch ZK 5 handles in the table and being placed on three positions, left, center, right, the closed situation of its K1～K4 contact."+" expression on-state.

Power supply is sent into by plug during use, and relay that will detect or automatic switch seal in the electric current outlet terminal of current feedback circuit, regulate voltage regulator TB 2 handles, just can obtain adjustable big electric current, when detected relay or automatic switch generation action or tripping operation, ammeter 6 readings of this moment are the overcurrent operating value of this relay or automatic switch.

This device adopts single-phase 220V power supply, except that voltage regulator TB 2, also has the transformer B3 of a 220/36V in the circuit, and effect has: play buffer action and guarantee personal safety; Reduce the output current of voltage regulator TB2.

The output current of strong current generator also can use pincers type ammeter to measure.This can save current transformer 2LH 8 and ammeter 6 and selector switch 5, makes it simpler, and volume is littler.

Claims

1, strong current generator, it is characterized in that: by voltage regulator, transformer, current transformer, ammeter, selector switch is formed, attaching plug inserts the input of single-phase voltage regulating device, single-phase voltage regulating device output inserts the 220V input of transformer, transformer secondary 36V output, one termination produces a termination of great current mutual inductor secondary, the other end is connected with fuse, fuse is connected with selector switch, selector switch also connects ammeter respectively, produce great current mutual inductor, measure a end with instrument transformer, measure another termination 5A electric current outlet terminal with instrument transformer and ammeter, two terminations that produce the former limit of great current mutual inductor connect 200A electric current outlet terminal.

2, strong current generator according to claim 1 is characterized in that: detected automatic switch or current relay are serially connected on the electric current outlet terminal of current feedback circuit.