Method and device for detecting electrical equipment secondary circuit
A technology for secondary circuits and electrical equipment, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of inconvenient operation, single judgment method of measuring equipment, etc., to solve the problem of single judgment method, improve detection ability and practicability , the effect of convenient use
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Embodiment 1
[0053] In order to improve the flexibility and functional characteristics of the measuring device for the secondary circuit of electrical equipment, this embodiment provides a test instrument that realizes the following functions: measuring the on-off of the secondary circuit, measuring the polarity of the voltage and current transformer, working power switch and low voltage alarm. In this way, the instrument can be molded, standardized, and standardized, and at the same time, the appearance of the test device and the convenience of use are also greatly improved.
[0054] This embodiment provides a circuit loop tester, including: a power supply module, a loop sounding module, a power supply voltage undervoltage detection and indication circuit module, a pointer ammeter module, and peripheral wiring connection terminals. Each module is described in detail below.
[0055] The power module is a dry battery pack that can be repeatedly charged and discharged, and is equipped with ...
Embodiment 2
[0062] When installing the electric energy meter, it is often easy to connect the wires from the CT wrongly. Typical situations include unconnected wires, reversed connection of CT incoming / outgoing wires, wrong connection of CT wires, etc. Since the installation of the electric energy meter is in a state of power outage, it is impossible to use calibrator and other equipment to judge the wrong wiring. This embodiment envisages adopting a simple and practical device to realize the error checking of the electric energy meter wiring under the power failure state. To check for CT wiring problems (which is the most common wiring error), this example uses an on-off alarm horn in series with the battery to identify whether the wire coming from the transformer is the current outgoing end (through) or the return end (through the mutual inductance). speaker), and make a judgment by listening to the sound of the speaker. Moreover, the circuit loop test equipment provided by this embodi...
Embodiment 3
[0067] Figure 6 It is a schematic diagram of the circuit composition of the circuit loop tester according to Embodiment 3 of the present invention, as Figure 6 As shown, number 65 is the terminal for measuring on-off, and number 67 is the terminal for measuring polarity. The two main functions of this device are: continuity test and polarity test.
[0068] The function of measuring continuity is to form a test loop through the series connection of the battery pack 61 and the analog speaker 62, and to judge whether the loop is in an on state by touching the test terminal 65 with the terminal of the loop to be tested. And it can be distinguished whether the test point is the current outlet terminal (straight-through) or the return terminal (through the transformer) according to the size of the loudspeaker sound. Furthermore, the transformation ratios of transformers with different transformation ratios can also be distinguished.
[0069] For the function of measuring polari...
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