Method for detecting states of control loops of electricity utilization collection terminals

[0017] Example 1

[0018] Such as figure 1 As shown, figure 2 The connection relationship shown, and image 3 The connection structure of the industrial user first connects the load to the load switch. When the load is running, the load switch that controls the load is periodically tested, and the load switch is connected to the remote signal detection switch;

[0019] The control center sends a switch output command to the electricity collection terminal, and the power collection terminal sends a switch control command. If the detection circuit detects that the load switch drive circuit is de-energized, the detection circuit will output according to the drive circuit de-energization. If the state is on, and the detection input state of the power collection terminal is on, the power collection terminal detects the input status and determines that the load switch drive circuit is normal, and the signal instruction returns to the judgment of the detection input status of the power collection terminal; if it leads to detection The circuit detects that the load switch drive circuit is energized, and the detection circuit is turned off according to the power failure output status of the drive circuit, and the power collection terminal detects the input state to determine that the load switch drive circuit is abnormal, and the signal instruction is transmitted to the power terminal The control center supervises the load switch.

[0020] When the load switch has an opening action, the remote signal detection switch connected to the load switch transmits the status signal of the remote signal detection switch to the control center. If the control center detects that the state of the remote signal detection switch is on, it means that the load switch is connected to the The load is connected normally and the switch is successfully opened, that is, the load and the load switch are in a normal state; then the control center will perform regular state inspections to the remote signal detection switch, that is, check every certain time, so that the monitoring unit can understand the industry The user’s supervision; on the contrary, if the remote signal detection switch connected to the load switch transmits the signal to the main control unit in the "close" signal state when the load switch has a switch action, the main control unit will set the remote signal detection switch "Close" signal is transmitted to the control center, that is, the load and the load switch are in an abnormal state, or the switch fails, or the connection between the load and the load switch is abnormal, etc., and the supervisory department needs to deal with the circuit of the industrial user;

[0021] Example 2

[0022] According to the same steps of embodiment 1, the state of the load and the load switch and the remote signal detection switch are inspected from time to time, and the same conclusion can be drawn. From the perspective of economy and rationality, this unscheduled inspection period is only to ensure that the regulatory authorities can monitor industrial users at any time.

[0023] Example 3

[0024] Such as figure 2 As shown, the remote signal detection switch is connected to the detection circuit, and then connected to the terminal switch and the load switch. The detection circuit structure is as follows image 3 The structure shown includes power input, rectifier, voltage stabilizing circuit, and drive output circuit; the power input is connected to the rectifying device, the rectifying device is connected to the voltage stabilizing circuit, and the voltage stabilizing circuit is connected to the drive output circuit; in this implementation In the example, the drive current of the drive output circuit is greater than 4mA, the drive output circuit uses a relay output circuit, the contact is normally open, and the break is closed when there is voltage, the relay uses a micro-power signal relay, and the rectifier is a bridge rectifier; To achieve the effect of the detection circuit, a varistor RV1 is connected at the entrance of the rectifier; the voltage-stabilizing circuit adopts a linear voltage-stabilizing circuit, and the circuit is connected with resistors R2, R3, and electrolytic capacitor E1; connected in the drive output circuit There are capacitor C1, resistor R4, and diode D5.

[0025] According to the operation steps in Example 1, when the load is in the running state, when the load switch has a tripping action, the state of the switch is detected by the remote signal, and the judgment of the control center is used to determine whether the load is connected to the load switch Normal, and whether the switch is normal or not; the flow diagram is as follows figure 1 As shown, in order to achieve a better economic effect, the main control organization generally detects the equipment in a cycle of 10 milliseconds, so that the situation of the electricity user can be monitored more accurately.

[0026] In this embodiment, since the drive current of the drive output circuit is relatively large, it is more appropriate to use a relay output circuit. The contacts are normally open, and the fracture is closed when there is voltage. The relay uses micro-power signal relays. It can be purchased on the market.