CN202306343U - Automatic draining controller for cable trench - Google Patents

Abstract

A cable ditch automatic drainage controller, in which a low electrode and a high electrode are set in the cable ditch, and a first normally closed contact of a relay is set between the low electrode and the high electrode, and the output end of the first normally closed contact of the relay is connected to the first The base of a triode, the collector of the first triode is connected to the base of the second triode, the collector of the second triode is connected to the relay, and the second normally closed contact of the relay is connected in series with the AC contactor , the first normally open contact of the AC contactor is set in the working circuit of the drainage motor. After the utility model is adopted, the accumulated water in the cable ditch can be discharged in time; the substation on duty does not need to regularly check whether there is any accumulated water in the cable ditch, which reduces the labor intensity; eliminates the power outage accident caused by the tripping of the circuit breaker caused by DC grounding, and improves power supply reliability.

Description

Cable trench automatic drainage controller

technical field

The utility model relates to a controller, in particular to a controller for discharging accumulated water in a ditch in time.

Background technique

Excavation and masonry according to the design requirements, the side wall of the ditch is welded with a load-bearing angle steel frame and grounded as required, and the underground ditch covered with a cover plate is the cable ditch. Its purpose is to lay underground dedicated channels for cables. The cover plate can be opened, and the cables are laid on the side wall welded load-bearing angle steel frame, which is widely used in power plants and substations in the power system.

The relay protection, automatic device, signal device, emergency lighting and remote operation of electrical equipment in the substation are realized through cables laid in the cable trench, and DC power is generally used as the operating power source; when there is a lot of rain in summer In season, because the cable trench is underground, rainwater can easily enter it, which may cause the grounding of the DC system, which may cause the circuit breaker to trip or refuse to operate, causing a power outage. At present, substations are equipped with submersible pumps for flood control. When the rainy season comes, the cable trench cover must be opened regularly to check the accumulated water in the trench. At present, the substation duty officer needs to regularly check whether there is water in the cable trench, which increases the labor intensity of the workers, and the water in the trench cannot be discharged in time.

Contents of the invention

The purpose of the utility model is to provide a cable ditch automatic drainage controller which saves manpower and avoids electrical accidents.

In order to achieve the above object, the utility model adopts the following technical solutions:

In the utility model, a low electrode and a high electrode are arranged in the cable trench, and the first normally closed contact of the relay is arranged between the low electrode and the high electrode, and the output end of the first normally closed contact of the relay is connected to the base of the first triode. pole, the collector of the first triode is connected to the base of the second triode, the collector of the second triode is connected to the relay, the second normally closed contact of the relay is connected in series with the AC contactor, and the AC contactor is normally open The contacts are arranged in the working circuit of the drain motor.

The second normally open contact of the AC contactor is set in the alarm circuit.

In the utility model adopting the above-mentioned technical solution, when the upper-limit water-immersion probe is soaked by water, the automatic drainage controller immediately whistles an alarm and outputs 220V voltage to start the water pump in the cable ditch to drain water. When the water level is lower than the lower limit of the immersion probe, the automatic drainage controller immediately stops the alarm and stops outputting 220V voltage, so that the water pump and other electrical equipment can be turned off. After the utility model is adopted, the accumulated water in the cable ditch can be discharged in time; the substation on duty does not need to regularly check whether there is any accumulated water in the cable ditch, which reduces the labor intensity; eliminates the power outage accident caused by the tripping of the circuit breaker caused by DC grounding, and improves power supply reliability.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model.

Detailed ways

As shown in Figure 1, the utility model sets a low electrode L and a high electrode H in the cable trench G, wherein the low electrode L is at the bottom of the cable trench G, and the high electrode H is located at the upper part of the cable trench G, and between the low electrode L and the The first normally closed contact JK1 of the relay is set between the high electrodes H, the output terminal of the first normally closed contact JK1 of the relay is connected to the base of the first triode T1, and the collector of the first triode T1 is connected to the second and third The base of the pole tube T2 and the collector of the second triode T2 are connected to the relay J1, the second normally closed contact JK2 of the relay is connected in series with the AC contactor CJ, and the first normally open contact CJ1 of the AC contactor is set on the drainage motor in the working circuit.

The second normally open contact CJ2 of the AC contactor is set in the alarm circuit.

The principle of the automatic drainage control circuit of the cable trench: the first normally closed contact JK1 of the relay J1 makes the circuit have hysteresis characteristics to avoid frequent motor movements; when the water level is lower than the low electrode L, the first triode T1 has no bias current and At the end, the second triode T2 is turned on, the relay J1 is pulled in, the second normally closed contact JK2 of the relay is opened, the AC contactor CJ does not act, and the drainage motor M does not work; when the water level rises to the high electrode H, then The first triode T1 is biased by the high electrode H and turned on, the second triode T2 is cut off, the relay J1 is released, the second normally closed contact JK2 of the relay is closed, the AC contactor CJ acts, and the first normally closed contactor of the AC contactor The open contact CJ1 is closed, and the drainage motor M is connected to start drainage. At the same time, the second normally open contact CJ2 of the AC contactor is closed, and the buzzer FM alarms.

At this time, the first normally closed contact JK1 of the relay is turned on again, assuming that the water level begins to drop and is lower than the high electrode H, but because the first normally closed contact JK1 of the relay is turned on, the bias current of the first triode T1 is maintained, and the second The triode T2 is kept closed, and the drainage continues until the water level is lower than the low electrode L, the relay J1 is closed, the second normally closed contact JK2 of the relay is opened, the AC contactor CJ is de-energized, the drainage motor M stops working, and the bee Chime FM stops working.

Claims (2)

1. automatic water discharge controller of cable duct; It is characterized in that: low electrode (L) and high electrode (H) are set in cable duct; And between low electrode (L) and high electrode (H), relay first normally closed contact (JK1) is set; The output terminal of relay first normally closed contact (JK1) connects the base stage of first triode (T1); The collector of first triode (T1) connects the base stage of second triode (T2); The collector connection relay (J1) of second triode (T2), relay second normally closed contact (JK2) and A.C. contactor (CJ) are connected in series, and A.C. contactor first normally opened contact (CJ1) is arranged in the operating circuit of drain motor.

2. the automatic water discharge controller of cable duct according to claim 1 is characterized in that: said A.C. contactor second normally opened contact (CJ2) is arranged in the warning circuit.