Development and Application of Anti-Theft Device for Low-Voltage Current Transformers

1. Innovation Background

With the progress of society and economic development, the electricity demand of power users is expanding increasingly. Lawbreakers, aiming to save electricity costs and pursue high profits, gradually use high - tech methods to steal electricity, causing huge economic losses to power supply enterprises. Currently, popular electricity theft methods in the market include illegally opening the wiring cover of low - voltage transformers in electric energy metering boxes, altering the converters of medium - and low - voltage current transformers, and short - circuiting the secondary wiring of current transformers. Among them, the anti - theft measures for low - voltage current transformers during use are insufficient, easily giving lawbreakers an opportunity.

To improve the anti - theft level of metering devices, a power supply company in a certain city has developed an anti - theft device for low - voltage current transformers. It includes a transformer main body and an anti - theft cover. An anti - theft cover lock is installed at the central position of the top of the anti - theft cover. The anti - theft cover lock adopts an electronic lock and is equipped with an intelligent key. Both the anti - theft cover lock and the intelligent key have an anti - theft function.

2. Principle and Function of Innovation Achievements

There are 2 cover wire - passing holes on the anti - theft cover, connected through 1 wire - passing pipe. The wire - passing pipe is located above each crimping piece, and there are at least 3 pipe wire - passing holes on the pipe wall of the wire - passing pipe. During use, any 2 pipe wire - passing holes can be selected to cooperate with the cover wire - passing holes to pass through the connecting wires connected to the 2 crimping pieces. When passing the wires specifically, the connecting wires need to pass through the cover wire - passing holes and the selected pipe wire - passing holes used in cooperation. The connecting wires need to be bent inside the anti - theft cover before being crimped on the crimping pieces, which helps to enhance the anti - theft effect of this anti - theft device for low - voltage current transformers to a certain extent. The design schematic diagram of this anti - theft device for low - voltage current transformers is shown in Figure 1.

3. Application Method and Effect

Before opening the anti - theft cover, the power staff can first input the unlocking key to the intelligent key through the background device. Then, hold the intelligent key with the input unlocking key to open the anti - theft cover lock. After opening the anti - theft cover, perform relevant operations on the low - voltage current transformer (such as removing the current transformer or re - wiring the current transformer, etc.). This avoids the hidden dangers caused by the untimely return or loss of the key, truly realizes the control of the opening of the anti - theft cover of the low - voltage current transformer in the electric energy metering box of power users, thereby enhancing the anti - theft effect. In addition, it also standardizes the management of the low - voltage current transformers in the electric energy metering box of power users.

There are 2 crimping pieces on the top of the low - voltage current transformer. Each crimping piece is fixed on the low - voltage current transformer by screws. Both the crimping pieces and the screws are covered in the anti - theft cover. An anti - theft cover lock is installed on the inner wall of the anti - theft cover. The anti - theft cover lock is located at the central position of the top of the low - voltage current transformer. An alarm is integrated in the anti - theft cover lock, which can trigger the alarm to give an alarm and send alarm information to the background device when an illegal intelligent key or an intelligent key with the unlocking key cleared is used to perform the unlocking action.

When wiring is in use, the connecting wire can pass through the cover wire - passing hole from outside the anti - theft cover and any pipe wire - passing hole on the wire - passing pipe in turn, and then be crimped to the corresponding crimping piece. The use of the wire - passing pipe makes the connecting wires passing through the cover wire - passing hole from outside the anti - theft cover directly penetrate into the wire - passing pipe, and can be crimped only after the wires passing through the pipe wire - passing holes in the wire - passing pipe are bent. The wire - passing pipe can be a straight pipe or an arc - shaped pipe. This ensures the anti - theft effect of anti - theft to a certain extent.

The design principle of this anti - theft device for low - voltage current transformers is reliable, the structure is simple, and it has a very wide application prospect. It is an effective means for power supply enterprises to prevent electricity theft and can effectively improve the management of transformers in low - voltage metering boxes.