CN202818175U - Oil pump motor control loop of a hydraulic operation mechanism for high-voltage circuit breaker - Google Patents

Abstract

A control circuit for an oil pump motor of a hydraulic operating mechanism for a high-voltage circuit breaker, comprising: a normally open contact point 1CJ1 of a magnetic contactor, an oil pump motor ZD of a hydraulic operating mechanism, a normally open contact point 1CJ2 of a magnetic contactor, a normally closed contact point 2DJ4 of an abnormal relay, and a pressure start second contact 2nd stroke switch 2W, magnetic contactor coil 1CJ, button QA, pressing to start the third stroke switch 1W, magnetic contactor normally open contact 1CJ4, pressure abnormality relay coil 1DJ, pressing to start the first stroke switch 5W, electric contact pressure gauge YX and The coil 2DJ of the abnormal pressure relay is characterized in that a small knife switch G is connected in parallel with the normally closed contact 2DJ4 of the abnormal pressure relay. It has the advantages of simple structure, easy operation, and reliable action. The maintenance personnel do not need to use a screwdriver to withstand the magnetic contactor, so that the oil pump motor ZD of the CY5 hydraulic operating mechanism can be forced to start, and the equipment can be operated safely and reliably.

Description

Oil pump motor control circuit of hydraulic operating mechanism for high voltage circuit breaker

technical field

The utility model relates to the field of electric transformation control, and relates to an oil pump motor control circuit of a hydraulic operating mechanism for a high-voltage circuit breaker. the

Background technique

High-voltage circuit breakers are the most important control and protection equipment in power plants, substations and power systems, and are important components of switches of various voltage levels. The opening and closing of contacts of high-voltage circuit breakers is realized through hydraulic operating mechanisms. . Taking the model SW2-110Ⅰ circuit breaker as an example, the operating mechanism it uses is a CY5 hydraulic mechanism. When the CY5 hydraulic operating mechanism is powered off for maintenance each time, the pressure of the CY5 hydraulic operating mechanism becomes zero, and it needs to be re-established. When the pressure is re-established, the upper cover of the magnetic starter of the CY5 hydraulic operating mechanism must be opened, and maintenance personnel Use a screwdriver to hold the magnetic starter to forcibly start the oil pump motor of the CY5 hydraulic operating mechanism, so that the oil pump enters the state of automatic pressure and builds up pressure. Because the magnetic starter is often removed with a screwdriver, the contacts of the magnetic starter may suffer from poor contact or burnout, causing the oil pump motor to lose power and fail to operate normally. the

Contents of the invention

The purpose of the utility model is to improve the prior art and provide an oil pump motor control circuit of a hydraulic operating mechanism for a high-voltage circuit breaker with simple structure and easy operation. the

The purpose of this utility model is achieved by the following technical solutions: an oil pump motor control circuit of a hydraulic operating mechanism for a high-voltage circuit breaker, which includes: a magnetic contactor normally open contact 1CJ1, an oil pump motor ZD of a hydraulic operating mechanism, and a magnetic contactor The normally open contact 1CJ2 is connected in series at both ends of the closing busbar; the normally closed contact 2DJ4 of the abnormal relay, the second stroke switch 2W for pressing and starting, the coil 1CJ of the magnetic contactor and the button QA are connected in series for both ends of the closing busbar; The three-stroke switch 1W is connected in series with the normally open contact 1CJ4 of the magnetic contactor and then connected to both ends of the second stroke switch 2W for pressing and starting; the coil 1DJ of the abnormal pressure relay and the first stroke switch 5W for pressing and starting are connected in series to both ends of the closing busbar ; The electric contact pressure gauge YX and the abnormal pressure relay coil 2DJ are connected in series at both ends of the control busbar, and the feature is: a small knife switch G is connected in parallel to the normally closed contact 2DJ4 of the abnormal relay. the

The oil pump motor control circuit of the hydraulic operating mechanism of the high-voltage circuit breaker of the present invention is connected in parallel with the small knife switch G on the normally closed contact 2DJ4 of the pressure abnormality relay. The small knife switch G connected in parallel on the normally closed contact point 2DJ4 of the abnormal relay, and then press the button QA to start the oil pump motor ZD of the CY5 hydraulic operating mechanism to work. It has the advantages of simple structure, easy operation, and reliable action. The magnetic contactor is locked, and the oil pump motor ZD of the CY5 hydraulic operating mechanism is forced to start, so that the equipment can be operated safely and reliably. the

Description of drawings

Figure 1 is a schematic diagram of a part of the oil pump motor control circuit of the hydraulic operating mechanism for high-voltage circuit breakers;

Fig. 2 is a schematic diagram of another part of the oil pump motor control circuit of the hydraulic operating mechanism for the high voltage circuit breaker.

Detailed ways

Utilize accompanying drawing and specific embodiment below to further illustrate the utility model. the

Referring to Figures 1 and 2, the oil pump motor control circuit of the hydraulic operating mechanism for high-voltage circuit breakers of the present invention includes: the normally open contact 1CJ1 of the magnetic contactor, the oil pump motor ZD of the hydraulic operating mechanism, and the normally open contact 1CJ2 of the magnetic contactor are connected in series The two ends of the closing busbar; the normally closed contact 2DJ4 of the abnormal relay, the second travel switch 2W for pressing and starting, the magnetic contactor coil 1CJ and the button QA are connected in series at both ends of the closing busbar; the third traveling switch 1W for pressing and starting is in contact with the magnetic force The normally open contact 1CJ4 of the device is connected in series to both ends of the second travel switch 2W for pressing and starting; the coil 1DJ of the abnormal pressure relay and the first travel switch 5W for pressing and starting are connected in series at both ends of the closing bus; the electric contact pressure gauge YX and The abnormal pressure relay coil 2DJ is connected in series to both ends of the control bus, and the small knife switch G is connected in parallel to the normally closed contact 2DJ4 of the abnormal pressure relay. the

The oil pump motor control loop operation process of the hydraulic operating mechanism of the high voltage circuit breaker of the present utility model is:

When the pressure of the hydraulic operating mechanism is zero after the overhaul of the high-voltage circuit breaker, the 11 and 10 contacts of the first travel switch 5W are pressed and activated, and the abnormal pressure relay coil 1DJ is excited to send a zero-pressure alarm signal, and the YX lower limit contact of the electric contact pressure gauge The connection pressure is less than 12.8Mpa, through the positive terminal of the control bus +KM, the 47 and 46 contacts of the electric contact pressure gauge YX, the coil 2DJ of the abnormal pressure relay, and the negative terminal of the control bus-KM, the coil 2DJ of the abnormal pressure relay is excited, and the abnormal pressure relay normally The closed contact 2DJ4 opens, the magnetic contactor coil 1CJ loses magnetism, and the normally open contacts 1CJ1 and 1CJ2 of the magnetic contactor are in the disconnected state. At this time, the hydraulic operating mechanism cannot build pressure; Small knife switch G, then press and hold the button QA, through the closing bus + HM positive terminal, closing DC circuit breaker K, positive power supply DC fuse RD1, parallel small knife switch G, press and start the second travel switch 2W, magnetic contactor Coil 1CJ, button QA, negative power supply DC fuse RD2, closing DC circuit breaker K and closing bus-HM negative terminal, so that the magnetic contactor coil 1CJ is excited, and the normally open contacts 1CJ1 and 1CJ2 of the magnetic contactor are closed; through the closing bus +HM positive terminal, closing DC circuit breaker K, positive power supply DC fuse RD1, magnetic contactor normally open contact 1CJ1, oil pump motor ZD, magnetic contactor open contact 1CJ2, negative power supply DC fuse RD2, closing DC air Open K, close the negative terminal of the busbar-HM, thereby starting the oil pump motor ZD of the CY5 hydraulic operating mechanism to work; when the stroke rod of the CY5 hydraulic operating The 47 and 46 contacts of the lower limit contact of YX are disconnected, the coil 2DJ of the abnormal pressure relay loses magnetism, and the normally closed contact 2DJ4 of the abnormal pressure relay closes. At this time, the button QA is released, and the closing bus + HM positive terminal and the closing DC circuit breaker K , Positive power supply DC fuse RD1, parallel-connected small knife switch G, pressure to start the second travel switch 2W, magnetic contactor coil 1CJ, pressure to start the first travel switch 5W contacts 9 and 10, negative power supply DC fuse RD2, closing The DC circuit breaker K and the negative terminal of the closing busbar -HM excite the coil 1CJ of the magnetic contactor, and the normally open contacts 1CJ1, 1CJ2, and 1CJ4 of the magnetic contactor are closed; the hydraulic operating mechanism enters the state of automatic suppression, and the pressure of the hydraulic operating mechanism is established. At the same time, open the small knife switch G connected in parallel on the normally closed contact 2DJ4 of the abnormal pressure relay. When the pressure reaches the specified value, the pressure will stop, and the pressure will start. The third stroke switch 1W will automatically disconnect, the magnetic contactor coil 1CJ will lose its magnetism, and the oil pump motor ZD will stop running. , It is not necessary to use a screwdriver to withstand the magnetic contactor to force the oil pump motor ZD of the CY5 hydraulic operating mechanism to start forcibly, which ensures the safe and reliable operation of the equipment.

Claims (1)

1. An oil pump motor control circuit of a hydraulic operating mechanism for a high-voltage circuit breaker, which includes: a normally open contact 1CJ1 of a magnetic contactor, an oil pump motor ZD of a hydraulic operating mechanism, and a normally open contact 1CJ2 of a magnetic contactor connected in series to the closing bus. terminal; abnormal relay normally closed contact 2DJ4, pressure start second stroke switch 2W, magnetic contactor coil 1CJ and button QA are connected in series at both ends of the closing bus; pressure start third stroke switch 1W and magnetic contactor normally open contact 1CJ4 After being connected in series, it is connected to both ends of the second travel switch 2W for pressing and starting; the coil 1DJ of the abnormal pressure relay and the first travel switch 5W for pressing and starting are connected in series at both ends of the closing bus; the electric contact pressure gauge YX and the coil of the abnormal pressure relay 2DJ It is connected in series at both ends of the control bus, and is characterized in that a small knife switch G is connected in parallel on the normally closed contact 2DJ4 of the abnormal relay.

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