CN-114999770-B - Large-current sheet current transformer with angle difference compensation

Abstract

The invention relates to a large-current sheet current transformer with angle difference compensation, which is provided with a shell, wherein a current carrying frame is arranged in the shell, an annular magnetic core is sleeved on the current carrying frame, the annular magnetic core is provided with a notch, a coil is wrapped on the annular magnetic core, the current carrying frame is connected with an external current source through passing through the annular magnetic core, a current acquisition circuit board and a needle seat are arranged in the shell, an interface contact pin is arranged on the needle seat, one end of the interface contact pin is connected with an output interface of the current acquisition circuit board through an angle difference compensation module, and the other end of the interface contact pin is connected with an interface of external test equipment. The invention is provided with the thermistor, when the temperature is abnormal, the control mechanism of the current acquisition circuit board acts to ensure the operation safety of the current transformer, the angle difference compensation loop avoids the condition of inaccurate metering caused by current disturbance, and the metering precision of the current transformer is improved.

Inventors

• PAN LINBIN
• YE FENG
• YUAN GUOJUN

Assignees

• 宁波泰丰源电气有限公司

Dates

Publication Date

20260505

Application Date

20220415

Claims (7)

1. 1. The large-current sheet current transformer with the angle difference compensation is provided with a shell, and is characterized in that a current carrying frame is arranged in the shell, an annular magnetic core is sleeved on the current carrying frame, a notch is arranged on the annular magnetic core, a coil is wrapped on the annular magnetic core, the current carrying frame is connected with an external current source through passing through the annular magnetic core, a current collection circuit board and a needle seat (6) are arranged in the shell, an interface contact pin (5) is arranged on the needle seat, one end of the interface contact pin (5) is connected with an output interface of the current collection circuit board through an angle difference compensation module, and the other end of the interface contact pin is connected with an interface of external test equipment; The shell comprises an upper shell (3) and a lower shell (4), the upper shell (3) and the lower shell (4) are semicircular shells, the needle seat (6) is arranged on the outer cambered surface of the lower shell (4), the acquisition circuit board is arranged at the side surface of the inner arm of the lower shell (4), the acquisition circuit board is provided with a detector, and the detector is arranged at a notch of the annular magnetic core; The current carrying frame is of a U-shaped structure and comprises a current carrying frame arm (2) and a bottom arm, the annular magnetic core is sleeved on the bottom arm, a shell clamping groove (8) is formed in the current carrying frame arm (2), a current carrying frame terminal (1) is arranged at the top end of the current carrying frame arm (2), and a terminal clamping groove (9) is formed in the current carrying frame terminal (1); The edge of the upper shell (3) is of a structure with an outer protruding edge (12), the edge of the lower shell (4) is of a structure with an inner protruding edge (13), and the outer protruding edge (12) and the inner protruding edge (13) are mutually locked.
2. 2. The large current sheet current transformer with angular difference compensation according to claim 1, wherein a current carrier shielding sleeve is arranged outside the current carrier.
3. 3. The large-current sheet current transformer with angular difference compensation according to claim 1, wherein a current carrier positioning column (10) is arranged on the side surface of the lower shell (4), and the current carrier positioning column (10) is arranged at a position corresponding to the side surface of the upper shell (3).
4. 4. The large current sheet current transformer with angle difference compensation according to claim 2, wherein the angle difference compensation module is provided with an angle difference compensation circuit, the output end of the current transformer is connected to the input end of the angle difference compensation circuit through a signal wire, and the input end is filtered by a capacitor and then output after passing through an operational amplifier and the angle difference compensation circuit.
5. 5. The large current sheet current transformer with angle difference compensation according to claim 4, wherein the angle difference compensation loop is connected with two reverse reference diodes, and is connected with the output end of the operational amplifier through a loop formed by a compensation resistor and a filter capacitor.
6. 6. The large-current sheet current transformer with angular difference compensation according to claim 2, wherein a temperature sensor is embedded in the current-carrying frame hole, and the temperature sensor is connected with the current collection circuit board through a signal wire.
7. 7. The large current sheet current transformer with angular difference compensation according to claim 6, wherein the temperature sensor is a thermistor.

Description

Large-current sheet current transformer with angle difference compensation Technical Field The invention relates to the technical field of current transformers, in particular to a large-current sheet current transformer with angle difference compensation. Background The current transformer is used for alternating current metering and detection, and is an important component of current metering equipment. The current transformer has only analog output function, which is a safety hazard for the computing equipment. The traditional current transformer is old in structure, meanwhile, an angle difference compensation loop is absent, potential safety hazards caused by electromagnetic interference are not considered in the design of a mechanism, and therefore the phenomenon that the measurement of external current is inaccurate in an interference environment occurs. Disclosure of Invention In order to overcome the defects of the prior art, a large-current sheet current transformer with angular difference compensation is provided. The current transformer is novel in structure, the temperature sensor is buried in the current carrier hole, the temperature sensor is connected with the current collection circuit board through the signal wire, the thermistor is tightly attached to the current carrier, and when the temperature is abnormal, the control mechanism of the current collection circuit board acts to ensure the operation safety of the current transformer. The angular difference compensation loop is connected with two reverse reference diodes, is connected with the output end of the operational amplifier through a loop formed by the compensation resistor and the filter capacitor, and is output after being subjected to capacitive filtration, so that the condition of inaccurate metering caused by current disturbance is greatly avoided, and the metering precision of the current transformer is improved. The technical scheme is that the high-current sheet current transformer with the angle difference compensation is provided with a shell, a current carrying frame is arranged in the shell, an annular magnetic core is sleeved on the current carrying frame, the annular magnetic core is provided with a notch, a coil is wrapped on the annular magnetic core, the current carrying frame is connected with an external current source through passing through the annular magnetic core, a current collecting circuit board and a needle seat are arranged in the shell, an interface contact pin is arranged on the needle seat, one end of the interface contact pin is connected with an output interface of the current collecting circuit board through an angle difference compensation module, and the other end of the interface contact pin is connected with an interface of external test equipment. The shell comprises an upper shell and a lower shell, the upper shell and the lower shell are semicircular shells, the needle seat is arranged on the outer cambered surface of the lower shell, the acquisition circuit board is arranged at the side surface of the inner arm of the lower shell, the acquisition circuit board is provided with a detector, and the detector is arranged at the notch of the annular magnetic core. The current-carrying frame is of a U-shaped structure and comprises a current-carrying frame arm and a bottom arm, the annular magnetic core is sleeved on the bottom arm, a shell clamping groove is formed in the current-carrying frame arm, a current-carrying frame terminal is arranged at the top end of the current-carrying frame arm, and a terminal clamping groove is formed in the current-carrying frame terminal. And a current-carrying frame shielding sleeve is arranged outside the current-carrying frame. Preferably, the edge of the upper shell is a structure with an outer protruding edge, the edge of the lower shell is a structure with an inner protruding edge, and the outer protruding edge and the inner protruding edge are mutually locked. Preferably, a current carrier frame positioning column is arranged on the side surface of the lower shell, and the current carrier frame positioning column is arranged at a position corresponding to the side surface of the upper shell. Preferably, the angle difference compensation module is provided with an angle difference compensation circuit, the output end of the current transformer is connected to the input end of the angle difference compensation circuit through a signal wire, and the input end is filtered through a capacitor and then output after passing through an operational amplifier and the angle difference compensation circuit. Preferably, the angular difference compensation loop is connected with two reverse reference diodes, and is connected with the output end of the operational amplifier through a loop formed by a compensation resistor and a filter capacitor. The current-carrying frame hole is provided with a current-carrying frame hole, a temperature sensor is buried in the current-