Integrated SF6 gas density controller

Abstract

The invention relates to an integrated SF6 gas density controller which is mainly composed of a unit, a machine core, an instrument dial and casing, a spring tube, a compensating component, a pressure-leading component, a pressure sensor, a temperature sensor, an amplification and compensation circuit, a V / I conversion circuit, a microprocessor (single chip microcomputer) and an E2PROM (programmable read-only memory). The unit, the pressure sensor and the temperature sensor are connected in series. The unit is connected with a temperature compensating circuit and a dial indicator in sequence. After operational amplifying and conversion through an A / D (analog / digital) conversion circuit, the pressure sensor is connected into the microprocessor, and the temperature sensor is connected into the microprocessor. The microprocessor outputs 4-20mA current signals through a D / A conversion circuit and the V / I conversion circuit. The microprocessor obtains compensation values of output signals at a certain temperature by aid of pressure-temperature comprehensive compensation in the E2PROM according to pressure and temperature signals, the amplification and compensation circuit is input, and an RS485 interface circuit directly outputs pressure and temperature before and after compensation.

Description

technical field [0001] The invention belongs to the technical field of intelligent instrument and meter manufacturing, and is a mechatronics product. The product mainly adopts sensor technology, single-chip microcomputer technology, and specific temperature compensation technology, making this product a composite product with novel and complete functions. The product can output three kinds of signals besides on-site instructions: switch control signal, two-wire 4-20mA standard current signal and RS485 digital signal. The products are mainly used in SF in smart substations 6 On-site indication, control and remote online monitoring of operating status parameters of high-voltage electrical equipment (such as circuit breakers, transformers, combined electrical appliances, etc.). Background technique [0002] SF 6 As an insulating and arc-extinguishing medium, gas is now widely used in high-voltage electrical equipment (such as circuit breakers, transformers, combined electric...

AI Technical Summary

Problems solved by technology

[0005] Although the mechanical density relay can indicate the gas density in the gas chamber of the equipment (that is, the gas pressure at 20°C) by means of a pointer, and can also send out an alarm and block the switch signal when the gas leaks and the density drops, but these functions are only It can meet the needs of monitoring the operating status and parameters of the equipment on site, and does not have the functions of remote signal transmission and communication with the computer monitoring system, which is the limitation of this product

[0006] while for SF 6 For the gas density transmitter, it only has the functions of signal remote transmission and communication with the computer monitoring system, but has no on-site indication and monitoring function, which brings trouble to some on-site maintenance work, and the staff cannot intuitively understand the status of the current equipment. state

Images