Protection unit of prepayment device

Abstract

The invention provides a protection unit of a prepayment device. The structure of the protection unit comprises a voltage transformer, a voltage collection module, a current transformer, a current collection module, a prepayment ammeter, a memory, a CPU (central processing unit), a switching power supply, a prepayment device vacuum switch and a signal drive circuit, wherein the voltage transformer is connected with the CPU through the voltage collection module; and the current transformer is connected with the CPU through the current collection module; and the prepayment ammeter, the memory, the switching power supply, the prepayment device vacuum switch and the signal drive circuit are respectively connected with the CPU. According to the invention, the integrated protection unit of the prepayment device is designed by using elements of the prepayment device, comprising the transformers and a circuit breaker and the like, and has the functions of short-circuit protection, overcurrent protection, zero sequence overcurrent protection, wireless communications and the like, so that the prepayment device has protection function. In addition, by using the protection unit of the prepayment device provided by the invention, while the investment of prepayment clients is reduced, the function of protecting the equipment of the clients can be realized, and the reliability of power supply is also improved at the same time.

Description

(1) Technical field [0001] The invention relates to a prepaid device, in particular to a prepaid device protection unit. (2) Background technology [0002] In order to meet the needs of power consumption management, the power supply department promotes the installation of 10kV high-voltage prepaid metering devices for users. The prepaid metering device is suitable for outdoor installation on poles. The main body is a high-voltage vacuum circuit breaker, and a high-voltage metering transformer is embedded inside, with holes on the side , lead the secondary line of the transformer and the secondary control signal line of the circuit breaker into the side control box, the side hole is waterproof and sealed and connected with the side control box, and the prepaid energy meter is placed in the side control box . When the user's pre-purchased electricity charge reaches the set value, the prepayment meter node acts, and the circuit breaker of the prepayment device trips to cut off...

AI Technical Summary

Problems solved by technology

[0003] Since the prepaid device is installed far away from the user's substation, the protection unit and prepaid meter's over-current protection action, short-circuit protection action, zero-sequence protection action, alarm signals such as low pre-purchased electricity balance, and zero circuit breaker trip signal for pre-purchased electricity. know in time

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