CN110854839A

CN110854839A - Power supply system for monitoring system and asymmetric load fault diagnosis method

Info

Publication number: CN110854839A
Application number: CN201910967768.9A
Authority: CN
Inventors: 刘新辉; 程鲲鹏; 戴林
Original assignee: Jiangsu Yuan Yuan Instrument Group Co Ltd
Current assignee: Jiangsu Yuan Yuan Instrument Group Co Ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-02-28

Abstract

The invention discloses a power supply system for a monitoring system, which comprises a power supply switching loop, a ring network, a detection loop and an alarm loop, wherein the ring network is connected with the power supply switching loop; the power supply switching loop comprises an AC220V power supply branch, a DC24V power supply branch and a bridge D1; the AC220V power branch comprises a power supply AC220V, a power switch QF1, a fuse FU1, a switching power supply AC/DC, a fuse FU3 and an intermediate relay K1 which are connected in series; the DC24V power supply branch comprises a power supply DC24V, a power switch QF2, a fuse FU2 and an intermediate relay K2 which are connected in series; the output ends of the AC220V power branch and the DC24V power branch are electrically connected with the bridge D1; the looped network and the detection loop comprise a current monitoring device KI and N loads which are connected in series; the bridge D1 is connected with the current monitoring device KI through a protection branch provided with a fuse; the contact of the current monitoring device KI is electrically connected with the alarm loop; the invention also discloses an asymmetric load fault diagnosis method for the power supply system for the monitoring system. The invention obviously reduces the hard cost and the construction difficulty of the cable.

Description

Power supply system for monitoring system and asymmetric load fault diagnosis method

Technical Field

The invention relates to a power supply system and a circuit fault diagnosis method, in particular to a power supply system for a monitoring system and a circuit fault diagnosis method.

Background

The power supply system is an important component of the monitoring system, and the reliable operation of the whole system is concerned. Power systems often require power to multiple subsystems, sensors, or actuators, and a power failure or line failure in the middle can cause partial or complete system failure. At present, in order to ensure the reliability of a power supply system, a mode of independently wiring and supplying power from a main system to each subsystem (or a sensor and an actuator) is basically adopted, and the hard cost and the construction difficulty of cables are increased.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the power supply system for the monitoring system, which can obviously reduce the hard cost and the construction difficulty of the cable.

The invention achieves the technical aim through the following technical scheme.

In a power supply system for a monitoring system, the improvement comprising: the system comprises a power supply switching loop, a ring network, a detection loop and an alarm loop; the power switching loop comprises an AC220V power branch, a DC24V power branch and a bridge D1; the AC220V power supply branch comprises a power supply AC220V, a power supply switch QF1, a fuse FU1, a switching power supply AC/DC, a fuse FU3 and an intermediate relay K1 which are sequentially connected in series from a power supply input end to an output end; the DC24V power supply branch comprises a power supply DC24V, a power supply switch QF2, a fuse FU2 and an intermediate relay K2 which are sequentially connected in series from a power supply input end to an output end; the output ends of the AC220V power branch and the DC24V power branch are electrically connected with a bridge D1; the looped network and the detection loop comprise a current monitoring device KI and N loads which are connected in series; the electric bridge D1 is connected with the current monitoring device KI through two protection branches which are connected in parallel and are respectively provided with a fuse FU4 and a fuse FU 5; the contact of the current monitoring device KI is electrically connected with the alarm loop; and the normally closed contacts of the intermediate relay K1 and the intermediate relay K2 are electrically connected with the alarm circuit respectively.

The asymmetric load fault diagnosis method for the power supply system of the monitoring system is adopted: the looped network and the detection loop are broken into two groups of independent power supply branch loops 1 and 2; the power supply branch loop 1 and the power supply branch loop 2 have different load, which causes the current I1 of the power supply branch loop 1 and the current I2 of the power supply branch loop 2 to be different, and triggers the contact of the current monitoring device KI to act, and the contact of the current monitoring device KI sends an alarm signal to the alarm loop.

Compared with the prior art, the invention has the following positive effects:

1. the power supply system for the monitoring system does not need to adopt a mode of independently wiring and supplying power from the main system to each subsystem (or a sensor and an actuator), and obviously reduces the hard cost of cables and the construction difficulty.

2. If a disconnection fault occurs between N loads of the ring network and the detection loop, the ring network and the detection loop are disconnected into two independent power supply branch loops 1 and 2, and normal operation of all systems can still be ensured.

3. The diagnosis method can give an alarm in time when disconnection faults occur between the looped network and the N loads of the detection loop, and ensures the normal operation of the power supply system.

Drawings

FIG. 1 is a circuit diagram of the present invention.

Detailed Description

The invention is further illustrated with reference to the following examples in accordance with the accompanying drawings.

The power supply system for the monitoring system shown in the attached drawing comprises a power supply switching loop, a ring network, a detection loop and an alarm loop; the power switching loop comprises an AC220V power branch, a DC24V power branch and a bridge D1; the AC220V power supply branch comprises a power supply AC220V, a power supply switch QF1, a fuse FU1, a switching power supply AC/DC, a fuse FU3 and an intermediate relay K1 which are sequentially connected in series from a power supply input end to an output end; the DC24V power supply branch comprises a power supply DC24V, a power supply switch QF2, a fuse FU2 and an intermediate relay K2 which are sequentially connected in series from a power supply input end to an output end; the output ends of the AC220V power branch and the DC24V power branch are electrically connected with a bridge D1; the looped network and the detection loop comprise a current monitoring device KI and N loads which are connected in series; the electric bridge D1 is connected with the current monitoring device KI through two protection branches which are connected in parallel and are respectively provided with a fuse FU4 and a fuse FU 5; the contact of the current monitoring device KI is electrically connected with the alarm loop; and the contacts of the intermediate relay K1 and the intermediate relay K2 are electrically connected with the alarm circuit respectively.

The embodiment realizes the dual power supply function of the power supply AC220V and the power supply DC24V, a normal AC220V power supply branch and a DC24V power supply branch are in a power supply state, the intermediate relay K1 and the intermediate relay K2 are powered on, and normally closed contacts of the intermediate relay K1 and the intermediate relay K2 are disconnected; if the AC220V power supply branch circuit has power supply failure, the intermediate relay K1 loses power, the normally closed contact of the intermediate relay K1 is converted from an open state to a closed state, a signal is transmitted to an alarm loop, and the alarm loop gives an alarm; if the power supply fault occurs in the DC24V power supply branch, the intermediate relay K2 loses power, the normally closed contact of the intermediate relay K2 is switched from an open state to a closed state, a signal is transmitted to an alarm loop, and the alarm loop gives an alarm; in this embodiment, the alarm circuit is an audible and visual alarm circuit, and an audible and visual alarm signal is sent out when the alarm is given.

If a disconnection fault occurs at the GZ1 position between the N loads of the ring network and the detection loop, the ring network and the detection loop are divided into two independent power supply branch loops 1 and 2, and normal operation of all systems can still be ensured, and meanwhile, the power supply branch loops 1 and the power supply branch loops 2 have different load loads, which causes the current I1 of the power supply branch loop 1 and the current I2 of the power supply branch loop 2 to be different, triggers the contact action of the current monitoring device KI, and the contact of the current monitoring device KI sends an alarm signal to the alarm loop to inform a worker of line inspection.

Claims

1. A power supply system for a monitoring system, characterized by: the system comprises a power supply switching loop, a ring network, a detection loop and an alarm loop; the power switching loop comprises an AC220V power branch, a DC24V power branch and a bridge D1; the AC220V power supply branch comprises a power supply AC220V, a power supply switch QF1, a fuse FU1, a switching power supply AC/DC, a fuse FU3 and an intermediate relay K1 which are sequentially connected in series from a power supply input end to an output end; the DC24V power supply branch comprises a power supply DC24V, a power supply switch QF2, a fuse FU2 and an intermediate relay K2 which are sequentially connected in series from a power supply input end to an output end; the output ends of the AC220V power branch and the DC24V power branch are electrically connected with a bridge D1; the looped network and the detection loop comprise a current monitoring device KI and N loads which are connected in series; the electric bridge D1 is connected with the current monitoring device KI through two protection branches which are connected in parallel and are respectively provided with a fuse FU4 and a fuse FU 5; the contact of the current monitoring device KI is electrically connected with the alarm loop; and the normally closed contacts of the intermediate relay K1 and the intermediate relay K2 are electrically connected with the alarm circuit respectively.

2. The asymmetric load fault diagnosis method for a power supply system of a monitoring system according to claim 1, characterized in that: the looped network and the detection loop are broken into two groups of independent power supply branch loops 1 and 2; the power supply branch loop 1 and the power supply branch loop 2 have different load, which causes the current I1 of the power supply branch loop 1 and the current I2 of the power supply branch loop 2 to be different, and triggers the contact of the current monitoring device KI to act, and the contact of the current monitoring device KI sends an alarm signal to the alarm loop.