A Dielectric Loss Test Circuit and Control Method for Preventing Inductive Electric Return

A technology for dielectric loss and testing circuits, applied in program control, computer control, dielectric performance measurement, etc., can solve problems such as inability to meet, destroy test instruments, and inability to meet various needs, to protect safety and enhance functionality Effect

CN107860982BActive Publication Date: 2019-12-27STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-12-27

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Abstract

The invention relates to a dielectric loss testing circuit capable of preventing inverse transmission of induced electricity and a control method thereof. The dielectric loss testing circuit comprisesa control panel single-chip microcomputer, a single-chip microcomputer measurement circuit, external equipment, a 220V power supply, a variable-frequency power supply, a Cx positive wiring current detection circuit, a Cn current detection circuit, a Cx negative wiring current detection circuit, a standard capacitor Cn and a switch K4, and further comprises a single-pole double-throw switch K3, awire inverting switch K5, a first indicator light circuit and a second indicator light circuit, wherein a moving contact of the single-pole double-throw switch K3 is connected with the standard capacitor Cn and a static contact of the wire inverting switch, one static contact of the single-pole double-throw switch K3 is connected with a step-up transformer, another static contact of the single-pole double-throw switch K3 is connected with the first indicator light circuit, and a moving contact of the wire inverting switch is connected with the second indicator light circuit. The dielectric loss testing circuit realizes the research for a multi-channel association test, enhances the functionality of a test instrument and meets the application of multiple test occasions on site, such as a test without wire disconnection, a multi-casing test and other diagnostic test items.
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Description

technical field

[0001] The invention relates to the technical field of electric power detection equipment, in particular to a dielectric loss test circuit and a control method thereof for preventing inductive electric reverse transmission. Background technique

[0002] Such as figure 1 Shown is an existing dielectric loss tester, wherein:

[0003] Measuring circuit: All calculations such as Fourier transform and complex number calculation, range switching, variable frequency power supply control, etc.

[0004] Control panel: printer, keyboard, display and communication relay.

[0005] Frequency conversion power supply: SPWM switching circuit is used to generate high-power sine wave regulated output.

[0006] Step-up transformer: boost the output of the variable frequency power supply to the measurement voltage, the maximum reactive power output is 2kVA / 1 minute.

[0007] Standard capacitor: internal Cn, measurement reference.

[0008] Cn current detection: used to detec...

Examples

Embodiment Construction

[0042] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0043] A dielectric loss test circuit for preventing inductive electric reverse transmission of the present invention comprises a control panel microcontroller and a microcontroller measuring circuit connected to the control panel microcontroller, an external device, a 220V power supply, and a variable frequency power supply. The wiring current detection circuit, the Cn current detection circuit, and the Cx reverse wiring current detection circuit are connected, and the frequency conversion power supply is also connected with the single-chip microcomputer measurement circuit through a step-up transformer, a standard capacitor Cn, and the step-up transformer is also connected with the switch K4. A single-pole double-throw switch K3 is set between the step-up transformer and the standard capacitor Cn, and also includes a reversing switch K5,...