CN201611803U

CN201611803U - Inductive power taking device of high-voltage cable current transformer

Info

Publication number: CN201611803U
Application number: CN2010201014225U
Authority: CN
Inventors: 祝长青; 黄峥
Original assignee: JIANGSU BORUN ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: JIANGSU BORUN ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2010-01-26
Filing date: 2010-01-26
Publication date: 2010-10-20
Anticipated expiration: 2020-01-26

Abstract

The utility model discloses an inductive power taking device of a high-voltage cable current transformer. The device comprises a current transformer (1) and a switching protection circuit (2), wherein the current transformer (1) is sleeved on a high-voltage cable; the switching protection circuit (2) is connected on the current transformer (1); the device also comprises an interference filter circuit (3), a detection rectifying circuit (4), a monitoring circuit (5), an over-voltage protection circuit (6) and a voltage conversion circuit (7); the interference filter circuit (3) is connected on the switching protection circuit (2); the detection rectifying circuit (4) is connected on the interference filter circuit (3); the monitoring circuit (5) is connected on the detection rectifying circuit (4); the over-voltage protection circuit (6) is connected on the monitoring circuit (5); and the voltage conversion circuit (7) is connected with the output end of the over-voltage protection circuit (6). The utility model provides the inductive power taking device of the high-voltage cable current transformer, which has simple structure and high output power, can run reliably, and can solve the problems of power line field transmission, power system high-voltage side measurement and control equipment power supply.

Description

High-tension cable current transformer induction electricity getting device

Technical field

The utility model relates to that a kind of (CT, Current Transformer) from the device of high-tension cable power taking, specifically, relate to a kind of high-tension cable current transformer induction electricity getting device by current transformer.The magnetic field energy that is used for leaking around the ultra-high-tension power transmission line is converted to electric energy, is the power supply of electric power system high-pressure side acquisition system.

Background technology

Build intelligent grid, at first require to realize open-air transmission of power circuit and the measurement of electric power system high-pressure side, control, and the high-pressure side measuring equipment, particularly Ye Wai power transmission lines be therefore impossible solve open-air transmission of power circuit and the measurement of electric power system high-pressure side by the low-pressure side lead directly to its power supply, control appliance power supply problem is the key of high-pressure side measuring equipment reliability service.

Wanting power taking from the power line, is nothing but to use the voltage transformer summation current transformer, and voltage transformer can only be obtained voltage, but energy is very little; And current transformer is must short circuit on the traditional theory!

In eelctrical engineering handbook and books of all sorts, to the conclusion of Current Transformer Secondary open circuit operation be: " the Current Transformer Secondary open circuit produces the high pressure that jeopardizes personal safety of several hectovolts, 1kV～10kV; Iron core seriously generates heat, and burns out current transformer." this also is the general knowledge that electric power circle is generally acknowledged.

By repetition test, we find that the power taking circuit scheme of boundary's suitable little impedance between short circuit and open circuit is feasible.

The 1. current fluctuation scope of two technological difficulties of instrument transformer power taking is big; When 2. the transmission line electric current was big, it was saturated magnetic core to occur, and heating is serious!

Several shortcomings of present prior art:

1. structure, circuit are all very complicated, and cost is very high.

2. actual power output of accomplishing all has only 2-3W.

3. electric pressure is little.

4. laboratory realizes, what safety precautions was considered lacks, and does not make and can actually use product.

Summary of the invention

The purpose of this utility model provide a kind of simple in structure, power output is high, and high-tension cable current transformer induction electricity getting device that can reliability service, can solve open-air transmission of power circuit and the measurement of electric power system high-pressure side, control appliance power supply problem.

The technical scheme that realizes above-mentioned purpose is: a kind of high-tension cable current transformer induction electricity getting device; comprise current transformer and switch protecting circuit; current transformer is enclosed within on the high-tension cable; the switch protecting circuit is connected on the current transformer; also comprise the interference filter circuit; detection rectification circuit; observation circuit; overvoltage crowbar and voltage conversion circuit; the interference filter circuit is connected on the switch protecting circuit; detection rectification circuit connects on the interference filter circuit; supervisory circuit is connected on the detection rectification circuit; overvoltage crowbar is connected on the supervisory circuit; voltage conversion circuit is connected with the output of overvoltage crowbar, and overvoltage crowbar also is connected with the switch protecting circuit.

Compared with prior art, electricity getting device described in the utility model simple in structure, easy to use, have that starting current is little, safe and reliable, cost is low, avoid advantages such as maintenance, power output can reach 10W, the scope of application is wide, can successfully realize on 110,000 volts cable, has thoroughly solved open-air transmission of power circuit and the measurement of electric power system high-pressure side, control appliance power supply problem.

Description of drawings

Fig. 1 is a circuit structure block diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

As Fig. 1; shown in 2; a kind of high-tension cable current transformer induction electricity getting device; comprise current transformer 1 and switch protecting circuit 2; current transformer 1 is enclosed within on the high-tension cable; switch protecting circuit 2 is connected on the current transformer 1; also comprise interference filter circuit 3; detection rectification circuit 4; supervisory circuit 5; overvoltage crowbar 6 and voltage conversion circuit 7; interference filter circuit 3 is connected on the switch protecting circuit 2; detection rectification circuit 4 connects on the interference filter circuit 3; supervisory circuit 5 is connected on the detection rectification circuit 4; overvoltage crowbar 6 is connected on the supervisory circuit 5; voltage conversion circuit 7 is connected with the output of overvoltage crowbar 6, and overvoltage crowbar 6 also is connected with switch protecting circuit 2.Interference filter circuit 3 is made up of filter and Transient Suppression Diode D0, D1.Detection rectification circuit 4 is made up of rectifier bridge D2-5 and capacitor C 2, C3, and rectifier bridge D2-5 is connected with the positive pole of capacitor C 2 with capacitor C 3 respectively, and capacitor C 2 and capacitor C 3 parallel connections.Overvoltage crowbar 6 integrated package U1 form, and its model is: MC3425.Voltage conversion circuit 7 is made up of DC-DC Voltage stabilizing module U2, is input as 18～72V, output 24V.

Operation principle of the present utility model is as follows:

Current transformer 1 mainly converts the energy of electromagnetic field around the high-tension cable to electric energy; Switch protecting circuit 2 mainly oppositely increases coil when electric current is excessive, the protection late-class circuit is not damaged by the high pressure of big electric current and generation, the electric spark that produces when yet suppressing to switch simultaneously, the contact of protection relay; Interference filter circuit 3 suppresses common mode disturbances and the differential mode interference in the loop once more; Detection rectification circuit 4 is with alternating voltage bridge rectifier, filtering; Supervisory circuit 5 is by detecting output voltage control switch protecting circuit 2 and overvoltage crowbar 6, and it is 10W that voltage conversion circuit 7 makes power output by pulse-width modulation circuit, and voltage is stabilized in 24V.

Claims

1. a high-tension cable current transformer is responded to electricity getting device; comprise current transformer (1) and switch protecting circuit (2); current transformer (1) is enclosed within on the high-tension cable; switch protecting circuit (2) is connected on the current transformer (1); it is characterized in that: also comprise interference filter circuit (3); detection rectification circuit (4); observation circuit (5); overvoltage crowbar (6) and voltage conversion circuit (7); interference filter circuit (3) is connected on the switch protecting circuit (2); detection rectification circuit (4) connects on the interference filter circuit (3); supervisory circuit (5) is connected on the detection rectification circuit (4); overvoltage crowbar (6) is connected on the supervisory circuit (5); voltage conversion circuit (7) is connected with the output of overvoltage crowbar (6), and overvoltage crowbar (6) also is connected with switch protecting circuit (2).

2. high-tension cable current transformer induction electricity getting device according to claim 1, it is characterized in that: interference filter circuit (3) is made up of filter and voltage-stabiliser tube D0, D1.

3. high-tension cable current transformer induction electricity getting device according to claim 1, it is characterized in that: voltage conversion circuit (7) is made up of DC-DC Voltage stabilizing module U2, is input as 18～72V, output 24V.