CN202034230U

CN202034230U - Openable current transformer

Info

Publication number: CN202034230U
Application number: CN2011201701829U
Authority: CN
Inventors: 潘文; 刘�文; 李庆喜; 张森; 陈江生; 杨江森
Original assignee: Hongta Tobacco Group Co Ltd
Current assignee: Hongta Tobacco Group Co Ltd
Priority date: 2011-05-25
Filing date: 2011-05-25
Publication date: 2011-11-09
Anticipated expiration: 2021-05-25

Abstract

The utility model belongs to devices for performing current transformation and electric isolation in a high-voltage electric power system, and specifically relates to a current transformer. A wiring terminal at a secondary winding side of the transformer is simultaneously connected in parallel with a working load, a relay contact head and a rectification circuit; further, the input impedance of the rectification circuit is higher than the input impedance of the working load; the output of the rectification circuit sequentially passes through a voltage-stabilizing circuit, a photoelectric coupler and an amplifier and then is sent into a trigger circuit; the output of the trigger circuit is sent into a loop formed by connecting a sampling amplifying circuit and a pushing circuit in series with a relay; and a reset button is connected in series in a turnover signal loop of the trigger circuit. The current transformer has a simple structure; the processing cost is low; when a circuit fault occurs, the quick short circuit of an open circuit of a secondary loop of the transformer can be achieved; and simultaneously, the alarming prompt is performed. The device can be made into a standard component, and is widely applied to secondary detection loops of power supplying and transmitting systems of electric production, power transmission and transformation and manufacturing factories.

Description

The openable current transformer

Affiliated technical field

The utility model belongs to the device that carries out unsteady flow and electrical isolation in the high-voltage electric power system, is specifically related to a kind of current transformer.

Background technology

Current transformer is the element that detects as primary current in transformer station of factory, the switchgear house, and it plays unsteady flow and electrical isolation effect.Be convenient to the secondary meter measurement and need be converted to more unified electric current, avoid the danger of direct measurement circuitry.Current transformer is (the falling stream) transformer that boosts; it is a measuring instrument in the electric power system; secondary devices such as relaying protection obtain the transducer of electric primary circuit current information; current transformer converts high electric current to low current in proportion; winding side joint of current transformer is at primary system; secondary winding side joint measuring instrument; relaying protection etc.; when measuring the big electric current of alternating current; need be converted to more unified electric current (secondary of China's rated current instrument transformer is rated for 5A or 1A) for ease of the secondary meter measurement; voltage on the circuit is breakneck than higher as direct the measurement all in addition; instrument transformer secondary winding side is in approximate short-circuit condition during operate as normal, and output voltage is very low.Secondary winding open circuit or a winding flow through abnormal current (as lightning current, resonance overcurrent, electric capacity charging current, inductance starting current etc.) if be in operation, and all can produce the overvoltage of thousands of volts even volts up to ten thousand in the secondary winding side.Not only insulation works the mischief to electrical secondary system for this; also can make the too drastic and scaling loss of instrument transformer; even the life security that jeopardizes the operations staff; therefore; the current transformer secondary mustn't connect fuse in the loop; do not allow when operation, just to pull down ammeter without bypass yet; equipment such as relay; traditional current transformer self warning of not opening a way; indication and open circuit automatic safety device; and the most of winding side of mounting means is that through type is installed; processing method commonly used is after finding that Displaying Meter does not show; reexamine electric loop; current transformer; in checking process; inspection to current transformer stops load often or adopts bypass short circuit instrument transformer secondary coil earlier; carry out the electric loop inspection again; to rapid judgement; discharge electric fault and cause great inconvenience; other is owing to the employing of conventional current instrument transformer is that through type is installed; to electrical network; the load of working; check out the faults itself of current transformer; need change; just can only stop electrical network; load will cause like this to power supply; produce bigger influence.

Summary of the invention

The purpose of this utility model provides a kind of openable current transformer, simple in structure, low processing cost, when fault occurring, can realize the transformer secondary circuit quick short circuit of opening a way, and carry out sound and light alarm simultaneously and point out, this device can be made into normal component, the secondary detection loop of the confession of extensive use electrical production, power transmission and transformation, manufacturing works, power transmission system.

The technical scheme that its technical problem that solves the utility model adopts is: the binding post of instrument transformer secondary winding side in parallel simultaneously operating load, relay contact and rectification circuit, and the input impedance of rectification circuit is higher than the input impedance of operating load, the output of rectification circuit is sent into circuits for triggering successively behind voltage stabilizing circuit, photoelectrical coupler and amplifier, the loop that sampling amplification circuit, promotion circuit and relay are in series is sent in the output of circuits for triggering, is in series with reset button in the energizing signal loop of circuits for triggering.

The output of described circuits for triggering inserts in the loop of three tunnel parallel connections, one the tunnel delivers to the loop of sound circuit, power amplifier and loud speaker, the second the tunnel delivers to the loop of flash driving circuit and LED light-emitting diode, the loop that Third Road is delivered to sampling amplification circuit, promoted circuit and relay.

The shell of this instrument transformer upper body and lower case two parts for separating link into an integrated entity by connecting screw; Secondary winding, rectification circuit, voltage stabilizing circuit, photoelectrical coupler, amplifier, circuits for triggering, sound circuit, power amplifier, loud speaker, flash driving circuit, LED light-emitting diode, sampling amplification circuit, promotion circuit, relay and reset button are housed, the winding of packing in the lower case one time in the upper body; The polarized plug and the socket of pegging graft and cooperating in correspondence with each other on the connecting plate of upper body and lower case, the position of corresponding loud speaker and LED light-emitting diode is provided with loud speaker sounding pilot hole and LED display aperture on the top blind flange of upper body.

The beneficial effects of the utility model are: have construction, easy for installation, quick, the advantage of simple in structure, low processing cost, be convenient to promote, can be made into normal component, the secondary detection loop of the confession of extensive use electrical production, power transmission and transformation, manufacturing works, power transmission system.This device can be under the situation that does not change original electric equipment operating state, the access of current transformer function is implemented on the winding side line road that needs are detected rapidly, realize the detection of a winding side electric current, and the test point by the Current Transformer Secondary coil, take out current signal, carry out rectification, voltage stabilizing, photoelectricity coupling, amplification, circuits for triggering, export three tunnel control signals simultaneously, control luminous, voice, short circuit load respectively, realize sound, light alarm indication the operation of current transformers state.When fault occurring, open circuit appears in the secondary winding side of current transformer, and drive the short circuit relay circuit and connect instrument transformer secondary winding side, and by LED flash alarm signal, the prompting of voice fault.

Description of drawings

Fig. 1, electrical schematic diagram of the present utility model.

Fig. 2, outward appearance front view of the present utility model.

Fig. 3, outward appearance right view of the present utility model.

Fig. 4, outward appearance vertical view of the present utility model.

Shown in the figure: 1 secondary winding, 2 binding posts, 3 rectification circuits, 4 voltage stabilizing circuits, 5 photoelectrical couplers, 6 amplifiers, 7 circuits for triggering, 8 sampling amplification circuits, 9 promote circuit, 10 relays, 11 sound circuits, 12 power amplifiers, 13 loud speakers, 13a loud speaker sounding pilot hole, 14 flash driving circuits, 15 LED light-emitting diodes, 15a LED display aperture, 16 power supplys, 17 instrument transformer upper body, 17a electronic circuit mounting box, 18 cover plates, 19 cover plate set bolts, 20 cover plate set bolt holders, 21 electronic circuit boards, 22 nameplates sign frame, 23 mutual inductor coil attachment plugs, 24 connecting screws, 24a top connecting plate, 24b bottom connecting plate, 25 installing and locating plugs, 26 installing and locating sockets, 27 mutual inductor coil gang sockets, 28 windings, 29 instrument transformer lower case, 30 supporting seats, 31 fixed screws, the 31a mounting plate, 32 LED power supply indicators, 33 operating loads, K1 reset button.

Embodiment

Housing of the present utility model is divided into upper and lower two parts.Electronic circuit part and instrument transformer coupling part are housed in the top, electronic circuit partly comprises the binding post 2 that is installed in the electronic circuit mounting box 17a, rectification circuit 3, voltage stabilizing circuit 4, photoelectrical coupler 5, amplifier 6, circuits for triggering 7, sampling amplification circuit 8, promote circuit 9, relay 10, sound circuit 11, power amplifier 12, loud speaker 13, flash driving circuit 14, LED light-emitting diode 15 and power supply 16, above-mentioned each electronic component is contained on the electronic circuit board 21, the upper end of instrument transformer upper body 17 is by cover plate set bolt 19 securing cover plates 18, and the face of corresponding loud speaker 13 and LED light-emitting diode 15 is provided with loud speaker sounding pilot hole 13a and LED display aperture 15a; The instrument transformer coupling part is a secondary winding 1, the bottom of instrument transformer upper body 17 is provided with mutual inductor coil attachment plug 23, the end face of top connecting plate 24a have with bottom connecting plate 24b on the installing and locating plug 25 that matches of installing and locating socket 26, top connecting plate 24a is connected by connecting screw 24 with bottom connecting plate 24b.One time winding 28, LED power supply indicator and reset button K1 are installed in the instrument transformer lower case 29, and the supporting seat 30 of the bottom of instrument transformer lower case 29 is provided with mounting plate 31a, are fixed with fixed screw 31 by top set installing hole.

The external meters lead that inserts when instrument transformer connects when working properly, the detected electric current of instrument transformer is 5A(1A), carry out low resistance connection by the external meters loop, the current signal of rectification circuit 3 is from being parallel to binding post 2, rectification circuit 3 is made of bridge rectifier, its input impedance is higher than the input impedance of external meters in parallel (operating load 33), connects just often so work as the external meters lead, and the electric current that current transformer produces only provides its work to use.

When external meters (operating load 33) the lead connection work of instrument transformer access is opened circuit, the electric current that on binding post 2, produces by rectification circuit 3 carry out rectification, voltage stabilizing circuit 4 carries out voltage stabilizing, output drives the luminescent device of photoelectrical coupler 5, its corresponding light-sensitive element is subjected to illumination and output voltage signal, this signal carries out micro-signal through amplifier 6 and amplifies, send into circuits for triggering 7, circuits for triggering 7 are exported three road signals respectively to sampling amplification circuit 8, flash driving circuit 14 and sound circuit 11.After the signal of sending into sampling amplification circuit 8 amplifies through sampling, via promoting circuit 9 output voltages the J1 relay is driven, the normally opened contact pair of wire connection terminals 2 of J1 is carried out short circuit, and then realizes the transformer secondary circuit quick short circuit function of opening a way.Circuits for triggering 7 output to flash driving circuit 14, produce pulse voltage signal, and output driving LED light-emitting diode 15 makes it to glimmer with pulse voltage, and the flicker alarm signal of sending can remind operator on duty's current transformer open-circuit condition to occur.Circuits for triggering 7 output to sound circuit 11, are built-in with the alarm voice fragment that records, as " please noting that open circuit appears in the FG01-10KV high-voltage mutual inductor, please repairs as early as possible! ", voice signal is sent into audio-frequency function amplifier 12, exports loud speaker 13 to after amplifying, and sends alarm voice sound.

What this device adopted is fault (open-circuit condition) state hold mode, after the open fault of this instrument transformer being checked disposal is normal, relay 10 under the malfunction still be in electricity condition, its normally open contact J1 is in closure state, binding post 2 also is in the short circuit state, transformer circuit forms the loop by the normally open contact of J1, causes rectification circuit 3 no currents to pass through.At this moment must press reset button K1 and carry out system reset, K1 resets to circuits for triggering 7, make its operating state counter-rotating, and then the high and low voltage signal of original triggering overturn, and then output control promotes circuit 9, at this moment the state synchronized of 10 relays, 11 sound circuits and flash driving circuit is carried out, and system enters normal holding state.

Claims

1. openable current transformer, it is characterized in that: the binding post of instrument transformer secondary winding side in parallel simultaneously operating load, relay contact and rectification circuit, and the input impedance of rectification circuit is higher than the input impedance of operating load, the output of rectification circuit is sent into circuits for triggering successively behind voltage stabilizing circuit, photoelectrical coupler and amplifier, the loop that sampling amplification circuit, promotion circuit and relay are in series is sent in the output of circuits for triggering, is in series with reset button in the energizing signal loop of circuits for triggering.

2. by the described openable current transformer of claim 1, it is characterized in that: the output of circuits for triggering inserts in the loop of three tunnel parallel connections, one the tunnel delivers to the loop of sound circuit, power amplifier and loud speaker, the second the tunnel delivers to the loop of flash driving circuit and LED light-emitting diode, the loop that Third Road is delivered to sampling amplification circuit, promoted circuit and relay.

3. by the described openable current transformer of claim 2, it is characterized in that: the shell of instrument transformer upper body and lower case two parts for separating link into an integrated entity by connecting screw; Secondary winding, rectification circuit, voltage stabilizing circuit, photoelectrical coupler, amplifier, circuits for triggering, sound circuit, power amplifier, loud speaker, flash driving circuit, LED light-emitting diode, sampling amplification circuit, promotion circuit, relay and reset button are housed, the winding of packing in the lower case one time in the upper body; The polarized plug and the socket of pegging graft and cooperating in correspondence with each other on the connecting plate of upper body and lower case, the position of corresponding loud speaker and LED light-emitting diode is provided with loud speaker sounding pilot hole and LED display aperture on the top blind flange of upper body.