CN210775633U - Sleeve type large-aperture current sensor for direct-current high-voltage system - Google Patents

Abstract

The utility model discloses a bushing type large aperture current sensor for direct current high voltage system, it is female with the stick to be equipped with the punching, the punching is female to be arranged the bar copper outsourcing and has all install the wiring copper bar at insulating layer and both ends, insulating layer axial intermediate position is fixed with cup joints the last casing and the lower casing of butt joint about and in the radial outside of insulating layer, it all is fixed with semicircle arcuation iron core to go up casing and the internal semicircle arcuation iron core that all is fixed with of inferior valve, printed circuit board, the fin and cup joint skeleton and the coil on semicircle arcuation iron core, the relative semicircle arcuation iron core that sets up is provided with hall element in the clearance that forms mutually in the mistake, coil in the upper and lower casing meets with the output after passing through the electrical apparatus.

Description

Sleeve type large-aperture current sensor for direct-current high-voltage system

Technical Field

The utility model relates to a current sensor, especially a bushing type large aperture current sensor who is used for direct current high voltage system that output is stable, the precision is high.

Background

The flexible direct current transmission is a novel power transmission technology based on a voltage source converter, a self-turn-off device and a Pulse Width Modulation (PWM) technology, and for automatically detecting current, current sensors are arranged in the existing flexible direct current transmission system. The Hall principle current sensor has two structures based on a Hall magnetic balance principle (closed loop) and a Hall direct measurement type principle (open loop). The iron core of the existing closed-loop current sensor is mostly square, the direction of an internal induction magnetic field is not completely consistent with the direction of a magnetic field generated by primary side current, and four Hall elements need to be opened and arranged in the horizontal direction and the vertical direction respectively. More air gaps of the iron core opening tend to increase magnetic leakage, and the magnetic leakage is multiplied by external interference, so that the zero point and precision errors are increased. Particularly, when the current sensor is applied to a system with a voltage level of more than 30KV direct current, an insulating sleeve needs to be isolated outside a through bus bar copper rod, the through aperture of a square iron core of the current sensor is increased, the defects of the current sensor are more prominent, the position of the through bus bar copper rod is easy to change, the output is inconsistent, and the output stability is reduced.

Disclosure of Invention

The utility model relates to a solve the above-mentioned technical problem that prior art exists, provide a bushing type large aperture current sensor who is used for direct current high voltage system that output is stable, the precision is high.

The technical solution of the utility model is that: a bushing type large aperture current sensor for a direct current high voltage system, characterized in that: the device is provided with a punching busbar copper bar, a pressure-resistant insulating layer is wrapped outside the punching busbar copper bar, wiring copper bars are arranged at two ends of the punching busbar copper bar, an upper shell and a lower shell which are sleeved on the radial outer side of the pressure-resistant insulating layer and are butted up and down are fixed at the axial middle position of the pressure-resistant insulating layer, a semicircular arc-shaped upper iron core with a downward opening, an upper printed circuit board and an upper radiating fin are fixed in the upper shell, a first upper coil and a second upper coil are wound outside the upper iron core, an upper Hall element is fixed on one end face of the upper iron core, and a lead of the upper Hall element is connected with the end of the; a semicircular arc lower iron core with an upward opening and an end face opposite to the end face of the upper iron core, a lower printed circuit board and a lower radiating fin are fixed in the lower shell, a first lower coil and a second lower coil are wound outside the lower iron core, a lower Hall element is fixed on the other end face of the lower iron core, which is staggered with the upper Hall element, and a lead of the lower Hall element is connected with the end of the first lower coil through a lower printed circuit board; the other end of the first upper coil is connected with one end of the second lower coil through a connecting piece, the other end of the first lower coil is connected with one end of the second upper coil through a connecting piece, and the other end of the second upper coil and the other end of the second lower coil are connected with a current output terminal fixed on the upper shell or the lower shell.

The utility model discloses an iron core adopts ring shape opening and adopts the structure of casing butt joint from top to bottom, and installation and easy maintenance only need set up two hall element, and iron core opening air gap is less, has reduced magnetic leakage and external disturbance, has overcome the zero point that prior art exists and the big problem of precision error, has improved measurement accuracy. Meanwhile, the position of the through bus bar copper bar is stable, high voltage and low voltage are isolated, the stability of output is ensured, and the through bus bar copper bar can be applied to a system with more than 30KV direct current voltage level.

Drawings

Fig. 1 is a schematic external structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic view of the internal structure of the upper and lower housings according to the embodiment of the present invention.

Fig. 3 is an exploded view of the upper housing according to the embodiment of the present invention.

Fig. 4 is an exploded view of the housing of the embodiment of the present invention.

Fig. 5 and 6 are schematic circuit diagrams of embodiments of the present invention.

Detailed Description

The utility model discloses a bushing type large aperture current sensor for direct current high voltage system, as shown in fig. 1~ 6: the coaxial bar is provided with a feed-through busbar and a bar 1, the feed-through busbar and the bar 1 are wrapped by silicon rubber and made into a high-low umbrella skirt, wiring copper bars 3 are mounted at two ends of a pressure-resistant insulating layer 2, a metal flange plate 4 is arranged at the axial middle position of the pressure-resistant insulating layer 2, an upper shell 51 and a lower shell 52 which are sleeved on the radial outer side of the pressure-resistant insulating layer 2 and are butted up and down are fixed on one side of the metal flange plate 4 through a connecting plate 7, the upper shell 51 and the lower shell 52 are metal shells, and the metal flange plate 4. A semicircular arc-shaped upper iron core 51-1 with a downward opening, an upper printed circuit board 51-2, an upper radiating fin 51-3 and an upper cover plate 51-10 are transversely and sequentially fixed in the upper shell 51, an upper framework 51-4 is sleeved outside the upper iron core 51-1, a first upper coil 51-5 and a second upper coil 51-6 are respectively wound on the upper framework 51-4, an upper Hall element 51-7 is fixed on one end surface of the upper iron core 51-1, a lead of the upper Hall element 51-7 is connected with the end of the first upper coil 51-5 through a circuit on the upper printed circuit board 51-2, the other end of the first upper coil 51-5 is connected with an upper connecting piece 51-8 fixed on a bottom plate 51-9 below the upper shell 51, two ends of the second upper coil 51-6 are connected with the upper connecting piece 51-8, the upper connector 51-8 may be an appliance plug. A semicircular lower iron core 52-1 with an upward opening and an end surface opposite to the end surface of the upper iron core 51-1, a lower printed circuit board 52-2, a lower radiating fin 53-3 and an upper cover plate 52-10 are transversely and sequentially fixed in the lower shell 52, a lower framework 52-4 is sleeved outside the lower iron core 52-1, a first lower coil 52-5 and a second lower coil 52-6 are respectively wound on the lower framework 52-4, a lower Hall element 52-7 is fixed on the other end surface of the lower iron core 52-1 which is staggered with the upper Hall element 51-7, a lead of the lower Hall element 52-7 is connected with the end head of the first lower coil 52-5 through a circuit on the lower printed circuit board 52-2, the other end head of the first lower coil 52-5 is connected with a lower connecting piece 52-8 (an electric appliance jack) which is fixed on a panel 52-9 on the lower shell 52 and corresponds to the upper connecting piece 51-8, both ends of the second lower coil 52-6 are connected to the lower connecting member 52-8. The first upper coil 51-5, the second upper coil 51-6, the first lower coil 52-5 and the second lower coil 52-6 have the same number of turns, or a direct winding manner after an insulating layer is added on the iron core can be adopted. The advantage of winding the coil on the framework is that the production process is simple and the efficiency is high, and the direct winding after the insulating layer is added on the iron core has the advantages of small interference from the outside, high precision and the like. The end of the first upper coil 51-5 is connected with one end of the second lower coil 52-6 through the upper connecting piece 51-8 and the lower connecting piece 52-8, the end of the first lower coil 52-5 is connected with one end of the second upper coil 51-6 through the lower connecting piece 52-8 and the upper connecting piece 51-8, the other end of the second upper coil 51-6 and the other end of the second lower coil 52-6 are connected with the current output terminal 6 (aviation plug) fixed on the upper shell 51 after being short-circuited through a connecting wire, and the current output terminal 6 is a total signal output terminal.

Claims (1)

1. A bushing type large aperture current sensor for a direct current high voltage system, characterized in that: the device is provided with a punching busbar copper bar, a pressure-resistant insulating layer is wrapped outside the punching busbar copper bar, wiring copper bars are arranged at two ends of the punching busbar copper bar, an upper shell and a lower shell which are sleeved on the radial outer side of the pressure-resistant insulating layer and are butted up and down are fixed at the axial middle position of the pressure-resistant insulating layer, a semicircular arc-shaped upper iron core with a downward opening, an upper printed circuit board and an upper radiating fin are fixed in the upper shell, a first upper coil and a second upper coil are wound outside the upper iron core, an upper Hall element is fixed on one end face of the upper iron core, and a lead of the upper Hall element is connected with the end of the; a semicircular lower iron core with an upward opening and an end face opposite to the end face of the upper iron core, a lower printed circuit board and a lower radiating fin are fixed in the lower shell, a first lower coil and a second lower coil are wound outside the lower iron core, a lower Hall element is fixed on the other end face of the lower iron core, which is staggered with the upper Hall element, and a lead of the lower Hall element is connected with the end of the first lower coil through a lower printed circuit board; the other end of the first upper coil is connected with one end of the second lower coil through a connecting piece, the other end of the first lower coil is connected with one end of the second upper coil through a connecting piece, and the other end of the second upper coil and the other end of the second lower coil are connected with a current output terminal fixed on the upper shell or the lower shell.

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