Voltage and current simultaneous measurement sensor for hydro-generator

Abstract

A voltage and current simultaneous measurement sensor for a hydro-generator comprises a shielding shell, the shielding shell is provided with a first output end, a second output end, a first input end, a second input end, a voltage sampling signal end and a current sampling signal end, and a current sampling magnetic core is arranged below the first input end and the second input end. A voltage sampling magnetic core is arranged below the first output end and the second output end, the current sampling magnetic core and the voltage sampling magnetic core are connected through an enameled wire, and a plurality of sampling coils are arranged on the voltage sampling magnetic core. By adopting the above structure, the voltage sensor and the current sensor are integrated, voltage and current signals can be measured at the same time through the device, and the working efficiency of testers is improved; all test items are completed through one-time wiring, potential safety hazards caused by repeated wiring and back-and-forth switching of the current sensor and the voltage sensor are avoided, and the test safety is improved. Voltage and current can be measured at the same time, the size of the whole project can be reduced, and carrying is convenient.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a voltage and current simultaneous measuring sensor for a hydro-generator. Background Art

[0002] According to the industry standard DL / T596-2021 "Procedure for Preventive Testing of Electrical Equipment", the preventive test items for hydro-generator rotors include rotor AC impedance test and rotor AC withstand voltage test. When a hydro-generator undergoes rotor AC impedance test, it is necessary to calculate the resistance by measuring voltage and current; when a hydro-generator undergoes rotor AC withstand voltage test, it is necessary to measure the voltage and current on the low-voltage side. If the voltage and current on the low-voltage side exceed the safe value, the hydro-generator needs to be protected. During the test, it is necessary to connect the current sensor and the voltage sensor to the test object to measure the current and voltage. The current sensor and the voltage sensor need to be disconnected and connected multiple times. This phenomenon not only increases the risk factor of the test, but also increases the number of test steps, reduces the work efficiency of the test personnel, and affects the accuracy of the test results. In response to the existing deficiencies, a sensor for simultaneously measuring voltage and current for a hydro-generator is proposed. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a voltage and current simultaneous measuring sensor for a hydro-generator, which integrates a voltage sensor and a current sensor into one. The voltage and current signals can be measured simultaneously by the device, thereby improving the work efficiency of the test personnel; all test items can be completed by wiring once, thus avoiding the safety hazards caused by multiple wiring and switching back and forth between the current sensor and the voltage sensor, thereby improving the safety of the test; the voltage and current can be measured simultaneously, which can reduce the size of the entire project and make it easy to carry.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a voltage and current simultaneous measurement sensor for a hydro-generator, comprising a shielding shell, on which a first output end, a second output end, a first input end, a second input end, a voltage sampling signal end and a current sampling signal end are provided, a current sampling magnetic core is provided below the first input end and the second input end, a voltage sampling magnetic core is provided below the first output end and the second output end, the current sampling magnetic core and the voltage sampling magnetic core are connected by enameled wire, and a plurality of sampling coils are provided on the voltage sampling magnetic core.

[0005] In a preferred solution, the plurality of sampling coils include a first voltage sampling coil and a second voltage sampling coil wrapped around one side of the voltage sampling magnetic core.

[0006] In a preferred solution, the current sampling magnetic core is connected to the current sampling signal terminal through an enameled wire.

[0007] In a preferred solution, the voltage sampling magnetic core is connected to the voltage sampling signal terminal via an enameled wire.

[0008] In a preferred solution, the shielding shell is made of metal.

[0009] The utility model provides a voltage and current simultaneous measuring sensor for a hydro-generator, which has the following beneficial effects by adopting the above structure:

[0010] (1) This device integrates the voltage sensor and the current sensor into one. Through this device, the voltage and current signals can be measured simultaneously, improving the work efficiency of the test personnel;

[0011] (2) This device can complete all test items with one wiring, avoiding the safety hazards caused by multiple wiring and switching between current sensors and voltage sensors, thereby improving the safety of the test;

[0012] (3) This device does not require simple instrument stacking and can measure voltage and current at the same time, which can reduce the size of the entire project and make it easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] In the figure: first output terminal 1, second output terminal 2, first input terminal 3, second input terminal 4, current sampling magnetic core 5, voltage sampling magnetic core 6, first voltage acquisition coil 7, second voltage acquisition coil 8, shielding shell 9, voltage sampling signal terminal 10, current sampling signal terminal 11. DETAILED DESCRIPTION

[0016] like Figure 1 A voltage and current simultaneous measurement sensor for a hydro-generator includes a shielding shell 9, on which a first output terminal 1, a second output terminal 2, a first input terminal 3, a second input terminal 4, a voltage sampling signal terminal 10, and a current sampling signal terminal 11 are provided. A current sampling magnetic core 5 is provided below the first input terminal 3 and the second input terminal 4, and a voltage sampling magnetic core 6 is provided below the first output terminal 1 and the second output terminal 2. The current sampling magnetic core 5 and the voltage sampling magnetic core 6 are connected by enameled wire, and a plurality of sampling coils are provided on the voltage sampling magnetic core 6.

[0017] In a preferred solution, the plurality of sampling coils include a first voltage sampling coil 7 and a second voltage sampling coil 8 which are wound around one side of the voltage sampling magnetic core 6 .

[0018] In a preferred solution, the current sampling magnetic core 5 is connected to the current sampling signal terminal 11 through an enameled wire.

[0019] In a preferred solution, the voltage sampling magnetic core 6 is connected to the voltage sampling signal terminal 10 via an enameled wire.

[0020] In a preferred solution, the shielding shell 9 is made of metal.

[0021] The method of using the present invention is as follows: when performing a rotor AC impedance test or a rotor AC withstand voltage test, an AC current with a constant voltage value of 100V and a constant current value of 1A is input to the first input terminal 3 and the second input terminal 4, and a test object is connected to the first output terminal 1 and the second output terminal 2;

[0022] The working principle of current sampling is based on electromagnetic induction. When 1A AC current passes through the current sampling core 5, it forms a surrounding magnetic field. The magnetic field causes an induced current to be generated in the coil. The induced current is transmitted to the current sampling signal terminal 11, which outputs the induced current to the sampling board. The primary current value is calculated by measuring the induced current and multiplying it by the turns ratio. The primary current usually refers to the current directly involved in the transmission and distribution of electric energy.

[0023] The working principle of voltage sampling is based on electromagnetic induction. When a 100V voltage passes through the voltage sampling core 6, a surrounding magnetic field is formed and input into the voltage acquisition primary coil 7. The voltage acquisition primary coil 7 transmits the voltage to the voltage acquisition secondary coil 8 through the enameled wire. A small voltage is induced in the voltage acquisition secondary coil 8, which is transmitted to the voltage acquisition signal terminal 10. The voltage sampling signal terminal 10 outputs the voltage to the sampling board. The voltage value of the primary coil is calculated by measuring the voltage and multiplying it by the turns ratio.

[0024] The beneficial effects of the utility model are as follows: the voltage sensor and the current sensor are integrated into one, and the voltage and current signals can be measured simultaneously through the device, thereby improving the work efficiency of the test personnel; all test items can be completed with one wiring, avoiding the safety hazards caused by multiple wiring and switching back and forth between the current sensor and the voltage sensor, thereby improving the safety of the test; the voltage and current can be measured simultaneously, which can reduce the size of the entire project and make it easy to carry.

Claims

1. A voltage and current simultaneous measuring sensor for a hydro-generator, comprising a shielding shell (9), characterized in that: The shielding shell (9) is provided with a first output terminal (1), a second output terminal (2), a first input terminal (3), a second input terminal (4), a voltage sampling signal terminal (10) and a current sampling signal terminal (11); a current sampling magnetic core (5) is provided below the first input terminal (3) and the second input terminal (4); a voltage sampling magnetic core (6) is provided below the first output terminal (1) and the second output terminal (2); the current sampling magnetic core (5) and the voltage sampling magnetic core (6) are connected by an enameled wire, and a plurality of sampling coils are provided on the voltage sampling magnetic core (6).

2. A voltage and current simultaneous measuring sensor for a hydro-generator according to claim 1, characterized in that: The plurality of sampling coils include a first voltage collection coil (7) and a second voltage collection coil (8) which are wound around one side of the voltage sampling magnetic core (6).

3. The voltage and current simultaneous measuring sensor for a hydro-generator according to claim 1, characterized in that: The current sampling magnetic core (5) is connected to the current sampling signal terminal (11) via an enameled wire.

4. The voltage and current simultaneous measuring sensor for a hydro-generator according to claim 1, characterized in that: The voltage sampling magnetic core (6) is connected to the voltage sampling signal terminal (10) via an enameled wire.

5. The voltage and current simultaneous measuring sensor for a hydro-generator according to claim 1, characterized in that: The shielding shell (9) is made of metal.

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