CN107477033A - HGIS/GIS circuit breaker and emergency energy storage device of hydraulic spring mechanism thereof - Google Patents

Abstract

The invention discloses an emergency energy storage device of a hydraulic spring mechanism of an HGIS/GIS circuit breaker, which is used for injecting high-pressure hydraulic oil into a high-pressure oil cylinder of a switch energy storage mechanism of the HGIS/GIS circuit breaker when a locking and separating brake fault occurs, and comprises the following components: the device comprises an oil tank, a standby pump, a one-way valve, at least one pressure measuring joint and a high-pressure testing hose which are connected with each other, wherein the oil tank is used for storing hydraulic oil, and one end of the high-pressure testing hose is communicated with a high-pressure oil cylinder of a switch energy storage mechanism of the HGIS/GIS circuit breaker; and the two ends of the high-pressure test hose are provided with thimbles; the pressure measuring joint is provided with a self-sealing valve, and when the pressure measuring joint is connected with the high-pressure measuring hose, a thimble of the high-pressure testing hose enables the self-sealing valve to be opened. The invention also discloses a corresponding HGIS/GIS circuit breaker. By implementing the invention, the switch energy storage mechanism of the HGIS/GIS circuit breaker can be rapidly stored.

Description

HGIS/GIS circuit breaker and its hydraulic spring mechanism emergency energy storage device

technical field

The invention relates to the technical field of HGIS/GIS (semi-gas insulated substation/gas insulated substation), in particular to an HGIS/GIS circuit breaker and an emergency energy storage device of a hydraulic spring mechanism thereof.

Background technique

In recent years, due to the development of cities, urban land has become more and more scarce, because HGIS/GIS equipment has been more and more widely used in substations due to its compact structure and small footprint. Especially in 500kV substations, the 3/2 wiring mode is generally used, and HGIS/GIS equipment is widely used. The circuit breaker is an important component of HGIS/GIS equipment, and its reliable operation is related to the safety and stability of the entire 500kV power grid system. If the 500kV medium switch is closed due to energy storage failure, it will cause the 500kV line and the main transformer to be out of service.

In the prior art, the energy storage mechanism of the 500kV HGIS/GIS circuit breaker is a hydraulic spring operating mechanism, which integrates the mechanical energy storage of the butterfly spring and the hydraulic drive and control. The pressure release of the disc spring acts on the three energy storage pistons. The mechanical energy represented by spring force and spring travel is converted into hydraulic energy represented by pressure and volume by means of an energy storage piston. Through the energy transmission between the high oil pressure energy storage piston and the working oil cylinder, the operating mechanism can perform fast closing and opening operations. The main advantages of hydraulic spring operating mechanism: simple design, high reliability, maintenance-free, minimal loss, and no temperature influence; so most 500kV HGIS/GIS circuit breakers use hydraulic spring operating mechanism.

Some failures will occur during the operation of the hydraulic spring operating mechanism or after a certain number of years, such as energy storage motor power circuit failure, energy storage motor failure, low oil level of the low pressure cylinder, energy storage gear failure, filter clogging, plunger pump failure wait. Any of the above failures can cause the mechanism to fail to open and close the energy storage blocking switch. When such a situation occurs, the repair usually takes several hours. At present, there is no rapid emergency energy storage device for the 500kV HGIS/GIS circuit breaker hydraulic spring operating mechanism to fail to build pressure at home and abroad.

Contents of the invention

The technical problem to be solved by the present invention is to provide an emergency energy storage device for an HGIS/GIS circuit breaker and its hydraulic spring mechanism, which can quickly switch the energy storage mechanism to the HGIS/GIS circuit breaker when the hydraulic spring mechanism of the HGIS/GIS circuit breaker fails. The high-pressure cylinder is injected with high-pressure hydraulic oil.

In order to solve the above technical problems, the present invention provides an emergency energy storage device for the hydraulic spring mechanism of the HGIS/GIS circuit breaker, which is used to inject Hydraulic oil, characterized in that it comprises: an interconnected oil tank, a backup pump, a check valve, at least one pressure test fitting, a high pressure test hose, wherein:

The oil tank is used to store hydraulic oil;

One end of the standby pump is connected to the oil tank, and the other end is connected to the one-way valve;

One end of the one-way valve is connected to the standby pump, and the other end is connected to a pressure measuring joint;

One end of the pressure measuring joint is connected to the one-way valve, and the other end is connected to the high pressure test hose;

A high-pressure test hose, one end of which is connected to the first pressure-measuring joint, and the other end communicates with the high-pressure oil cylinder of the switch energy storage mechanism of the HGIS/GIS circuit breaker; the two ends of the high-pressure test hose are provided with thimbles;

A second pressure measuring joint, one end of which is connected to the high pressure test hose, and the other end is connected;

Wherein, both the first pressure measuring joint and the second pressure measuring joint are provided with a self-sealing valve, and when the high-pressure pressure measuring hose is connected, the thimble of the high-pressure testing hose opens the self-sealing valve.

Wherein, an oil pressure joint is further provided between the high-pressure test hose and the high-pressure oil cylinder of the switch energy storage mechanism of the HGIS/GIS circuit breaker.

Wherein, the standby pump is a manual pump with a manually operated crank for controlling the injection of the hydraulic oil high-pressure test hose in the oil tank into the high-pressure oil cylinder.

Wherein, the standby pump is a high-pressure pump controlled by a motor.

Wherein, a high pressure gauge for detecting the current oil pressure is further connected between the one-way valve and the first pressure measuring joint.

Wherein, a high-pressure cut-off valve and a relief valve connected in parallel are led out between the one-way valve and the first pressure measuring joint, and the other ends of the high-pressure cut-off valve and the relief valve are connected to each other through an oil return filter. The oil tanks are connected.

Wherein, at least one of an air filter and a liquid level gauge is further arranged on the oil tank.

Correspondingly, the present invention also provides a HGIS/GIS circuit breaker, which at least includes a switch energy storage mechanism, and the switch energy storage mechanism at least includes an energy storage motor, a PE8 plunger pump gear, an energy storage piston, and an energy storage disc spring column , a pressure release lever and a pilot valve, the switch energy storage mechanism is connected with a high-pressure oil cylinder; the HGIS/GIS circuit breaker is further provided with the aforementioned hydraulic spring mechanism emergency energy storage device.

Implement the present invention, have following beneficial effect:

In order to ensure that the switch can be opened and closed normally, it is necessary to connect the backup pump, one-way valve, pressure test joint, high pressure test hose, and pressure test joint (ie, pressure measurement connector) on the hydraulic mechanism, and pressurize the hydraulic oil through the backup pump. After that, it is injected into the high-pressure oil cylinder of the hydraulic mechanism. When the pressure in the oil cylinder reaches 530bar (can be judged by the pressure gauge or the stroke of the disc spring column), the opening and closing lock of the switch can be released.

By adopting the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker provided by the present invention, there is no need to expand the power failure range to cause load loss when the switch is closed and closed, and the energy storage of the switch mechanism can be completed in a short time to realize rapid opening and isolation of faulty switches . Greatly improve power supply reliability, reduce power failure load loss; reduce abnormal interval operation time, and reduce the risk of power grid leapfrog tripping.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic front view of an embodiment of a hydraulic spring mechanism energy storage device for a HGIS/GIS circuit breaker provided by the present invention;

Fig. 2 is a rear view schematic diagram of Fig. 1;

Fig. 3 is a principle schematic diagram of an embodiment of an emergency energy storage device of a hydraulic spring mechanism of a HGIS/GIS circuit breaker provided by the present invention;

Fig. 4 is a schematic structural view of an embodiment of an emergency energy storage device for a hydraulic spring mechanism of a HGIS/GIS circuit breaker provided by the present invention;

Fig. 5 is a schematic structural view of the pressure measuring joint in Fig. 4;

Fig. 6 is a schematic diagram of the structure of the check valve in Fig. 4;

Fig. 7 is a schematic structural view of the high pressure test hose in Fig. 4;

Fig. 8 is a principle schematic diagram of another embodiment of an emergency energy storage device of a hydraulic spring mechanism of a HGIS/GIS circuit breaker provided by the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figure 1, it shows a schematic front view of an embodiment of an energy storage device for a hydraulic spring mechanism of a HGIS/GIS circuit breaker provided by the present invention; at the same time, it is combined with the schematic rear view in Figure 2; in this embodiment Among them, the switch energy storage device in the HGIS/GIS circuit breaker at least includes: energy storage motor 6, PE8 plunger pump gear 2, energy storage piston 3, energy storage disc spring column 4, pressure release lever 5, low pressure cylinder oil level indicator Device 7, high pressure connector/pressure measurement connector 8, pilot valve 9 and high pressure cylinder 90.

Among them, the gear of the energy storage motor 6 meshes with the gear 2 of the PE8 plunger pump to drive the plunger pump (not shown) to convert the low oil pressure into a high oil pressure, and the high oil pressure energy storage piston 3 compresses the energy storage disc spring column 4 to achieve switch energy storage. The pressure release of the energy storage disc spring post 4 acts on the three energy storage pistons 3 . The mechanical energy represented by the spring force and the stroke of the disc spring column is converted into hydraulic energy represented by pressure and volume through the energy storage piston 3 . The energy transmission between the high oil pressure energy storage piston 3 and the high pressure oil cylinder 90 is realized through the control of the pilot valve 9, so that the hydraulic operating mechanism can perform fast closing and opening operations.

However, when the energy storage motor 6 fails or the motor power circuit fails, the plunger pump gear 6 (such as PVC material) fails, the oil level of the low pressure cylinder is low, the PE8 plunger pump fails, the filter is clogged, etc., the operation switch energy storage None of the devices can build pressure and store energy, thus blocking the opening and closing of the switch.

In order to solve the above problems, the present invention provides an emergency energy storage device 1 for a hydraulic spring mechanism of a HGIS/GIS circuit breaker. The emergency energy storage device 1 communicates with a high-pressure oil cylinder 90 through a high-pressure connector/pressure measurement connector 8 for When the HGIS/GIS circuit breaker fails, inject hydraulic oil into the high-pressure cylinder of the switch energy storage mechanism to replace the electric oil pump in the original switch energy storage mechanism to complete the energy storage process, so that the pressure control mechanism can be quickly closed Opening operation. Specifically, as shown in Figures 3 to 7, an embodiment of an HGIS/GIS circuit breaker hydraulic spring mechanism emergency energy storage device 1 is shown, which includes: an oil tank 10 connected to each other, a backup pump 11, and a one-way valve 12 , at least one pressure measuring joint 13, a high pressure test hose 14, wherein:

The oil tank 10 is used to store hydraulic oil, for example, in one example, 10# aviation hydraulic oil can be used;

The standby pump 11 has one end connected to the oil tank 10 and the other end connected to the one-way valve 12;

One end of the one-way valve 12 is connected to the standby pump 11, and the other end is connected to a pressure measuring joint 13. In the one-way valve 12, the fluid can only flow in from one end and flow out from the other end, and cannot flow in reverse, ensuring The hydraulic oil can only flow from the standby pump 11 to the high-pressure cylinder 90 of the switch energy storage device, and cannot flow back from the high-pressure cylinder 90 to the standby pump 11;

Described pressure measuring joint 13, its one end is connected with described one-way valve 12, and its other end is connected with high pressure test hose 14;

One end of the high-pressure test hose 14 is connected to the pressure measuring joint 13, and the other end is connected to the high-pressure cylinder 90 of the switch energy storage mechanism of the HGIS/GIS circuit breaker; the two ends of the high-pressure test hose 14 are provided with thimbles ;

Wherein, the pressure measuring connector 13 is provided with a self-sealing valve, and when the high-pressure pressure measuring hose 14 is connected, the thimble of the high-pressure testing hose 14 makes the self-sealing valve open; under normal circumstances, the self-sealing valve is in In the closed state, the hydraulic oil can be prevented from leaking through the pressure measuring joint 13. When the high pressure measuring hose with a thimble or the pressure measuring joint is docked with it, the self-sealing valve is opened, and the hydraulic oil can be injected into the high pressure of the switch energy storage device through the pressure measuring joint. In the oil cylinder 90.

Specifically, an oil pressure joint 13 is further provided between the high-pressure test hose 14 and the high-pressure oil cylinder 90 of the switch energy storage mechanism of the HGIS/GIS circuit breaker.

Wherein, in the first embodiment, the backup pump 11 is a manual pump, on which a manually operated crank is used to control the injection of the hydraulic oil high pressure test hose 14 in the oil tank 10 into the high pressure pump. In the oil cylinder 90.

Specifically, when the emergency energy storage device of a hydraulic spring mechanism of a HGIS/GIS circuit breaker provided by the present invention is actually used, the following test steps need to be carried out:

1. Assembly and fixing steps

Check all parts of the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker for defects, preliminarily clean the parts, and then assemble them as shown in Figure 4 above, and securely fix the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker. The hose is temporarily not connected to the high-pressure oil cylinder of the switch energy storage device.

2. Cleaning device steps

Inject a certain amount of hydraulic oil into the oil tank, put the outlet of the high-pressure test hose in the empty bottle, operate the crank handle of the manual pump, and clean the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker through the high-speed flow of hydraulic oil to avoid Impurities are brought into the hydraulic mechanism during energy storage.

3. Oil discharge and exhaust steps

Open the oil drain valve of the switch energy storage device, put the hydraulic oil into the container, and then pour it into the oil tank of the emergency energy storage device of the circuit breaker. At this time, slowly operate the hand pump crank to drain the oil pump and high-pressure test hose. Observe the outlet of the high-pressure test hose, wait until the gas in the high-pressure test hose is exhausted, and immediately connect the high-pressure test hose to the pressure measurement connector on the switch energy storage device.

4. Manual energy storage test steps

Operate the crank handle of the manual pump, conduct a manual energy storage test on the switch energy storage device, pay attention to observe the change of the oil level in the oil tank, stop the energy storage immediately when the oil level is too low, so as not to press gas into the high pressure of the switch energy storage device Inside the cylinder. The test can be continued after refilling the oil tank with hydraulic oil.

5. Opening and closing test steps

When the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker is connected to the energy storage device of the switch, the opening and closing test of the hydraulic operating mechanism is carried out. The test is repeated many times to ensure that there is no abnormality in the opening and closing of the switch.

6. Device removal steps

After all the test items are completed, the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker is removed, and the switch energy storage device is restored to the normal state.

It can be understood that, in actual use, the operation of the emergency energy storage device in the hydraulic spring mechanism of the circuit breaker is similar to the testing process.

In one example, the rated pressure of the high-pressure cylinder of the switching hydraulic mechanism of HGIS or GIS is 530bar. At this time, the energy storage of the switching mechanism is normal, which meets the requirements of opening and closing of the switch. When the pressure value of the high-pressure oil cylinder of the hydraulic operating mechanism is reduced to 526bar, the reclosing is blocked, when it is reduced to 482bar, it is blocked and closed, and when it is reduced to 453bar, it is blocked and opened. In order to ensure that the switch can be opened and closed normally, it is necessary to connect the spare pump, one-way valve, pressure test joint, high-pressure test hose, and pressure test joint (ie, pressure measurement connector) on the hydraulic mechanism, and pass #10 aviation hydraulic oil through the spare After the pump is pressurized, it is injected into the high-pressure oil cylinder of the hydraulic mechanism. When the pressure in the oil cylinder reaches 530bar (can be judged by the pressure gauge or the stroke of the disc spring column), the opening and closing lock of the switch can be released.

In a practical example, using the emergency energy storage device of the circuit breaker hydraulic spring mechanism provided by the present invention, the hydraulic mechanism can manually store energy from zero pressure (disc spring compression 0mm) to the rated pressure (disc spring compression 83.5mm) about It took 17 minutes to manually store the energy from the low oil pressure locking pressure (disc spring compression 40mm) to the rated pressure (disc spring compression 83.5mm) in about 9 minutes. From the opening low oil pressure locking pressure (disc spring compression It takes about 7 minutes to manually store energy to the rated pressure (disc spring compression 83.5mm), and this time includes the time for draining and filling oil during the energy storage process. Without this technique, it would often take several hours.

As shown in FIG. 8 , it shows a kind of emergency energy storage device 1 for HGIS/GIS circuit breaker hydraulic spring mechanism provided in another embodiment of the present invention. In this embodiment, it is the same as the first implementation shown in FIG. 3 The main difference among the examples is that the standby pump 11 is a high-pressure pump controlled by a motor 15 .

In addition, the following components have been added:

Wherein, a high pressure gauge 16 for detecting the current oil pressure is further connected between the one-way valve 12 and the pressure measuring joint 13 .

Wherein, a high-pressure cut-off valve 18 and an overflow valve 17 connected in parallel are led out between the one-way valve 12 and the pressure-measuring joint 13, and the other ends of the high-pressure cut-off valve 18 and the overflow valve 17 are connected through a return valve. The oil filter 19 is in communication with the oil tank 10, the high-pressure cut-off valve 18 is used for pressure relief when the pressure in the high-pressure oil cylinder 90 is too large, and the overflow valve 17 is used for the high-pressure test hose 14. When the hydraulic oil overflows, it flows to the oil tank 10 .

Wherein, at least one of an air filter 101 and a liquid level gauge 102 is further arranged on the oil tank 10 , and the liquid level in the oil tank 10 can be observed through the liquid level gauge 102 so as to replenish hydraulic oil in time.

For more details, reference may be made to the foregoing description of FIGS. 3 to 7 .

Implementing the embodiment of the present invention has the following beneficial effects:

In order to ensure that the switch can be opened and closed normally, it is necessary to connect the spare pump, one-way valve, pressure measuring joint, high pressure test hose, and pressure measuring joint on the hydraulic mechanism (that is, the pressure measuring connector), and add aviation hydraulic oil through the spare pump. After the pressure is injected into the high-pressure oil cylinder of the hydraulic mechanism, when the pressure in the oil cylinder reaches 530bar (can be judged by the pressure gauge or the stroke of the disc spring column), the opening and closing lock of the switch can be released.

By adopting the emergency energy storage device of the hydraulic spring mechanism of the circuit breaker provided by the present invention, there is no need to expand the power failure range to cause load loss when the switch is closed and closed, and the energy storage of the switch mechanism can be completed in a short time to realize rapid opening and isolation of faulty switches . Greatly improve power supply reliability, reduce power failure load loss; reduce abnormal interval operation time, and reduce the risk of power grid leapfrog tripping.

The above disclosure is only a preferred embodiment of the present invention, which certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (8)

1. An emergency energy storage device for a hydraulic spring mechanism of a HGIS/GIS circuit breaker, used to inject high-pressure hydraulic oil into the high-pressure oil cylinder of the switch energy storage mechanism when an opening and locking fault occurs in the HGIS/GIS circuit breaker, it is characterized in that , including: interconnected oil tanks, backup pumps, check valves, at least one pressure tap, high pressure test hose, where: The oil tank is used to store hydraulic oil; One end of the standby pump is connected to the oil tank, and the other end is connected to the one-way valve; One end of the one-way valve is connected to the standby pump, and the other end is connected to a pressure measuring joint; One end of the pressure measuring joint is connected to the one-way valve, and the other end is connected to the high pressure test hose; One end of the high-pressure test hose is connected to the pressure measuring joint, and the other end is connected to the high-pressure oil cylinder of the switch energy storage mechanism of the HGIS/GIS circuit breaker; two ends of the high-pressure test hose are provided with thimbles; Wherein, the pressure measuring joint is provided with a self-sealing valve, and when the high-pressure pressure measuring hose is connected, the thimble of the high-pressure testing hose opens the self-sealing valve. 2. A kind of HGIS/GIS circuit breaker hydraulic spring mechanism emergency energy storage device as claimed in claim 1, characterized in that, between the high pressure test hose and the high pressure oil cylinder of the switch energy storage mechanism of HGIS/GIS circuit breaker A pressure measuring joint is further provided between them. 3. The emergency energy storage device of a hydraulic spring mechanism of a HGIS/GIS circuit breaker as claimed in claim 1, wherein the standby pump is a manual pump on which a manually operated crank is provided for controlling the The hydraulic oil high pressure test hose in the oil tank is injected into the high pressure oil cylinder. 4. An emergency energy storage device for a hydraulic spring mechanism of a HGIS/GIS circuit breaker as claimed in claim 1, wherein the backup pump is a high-pressure pump controlled by a motor. 5. A kind of HGIS/GIS circuit breaker hydraulic spring mechanism emergency energy storage device as claimed in claim 4, characterized in that, a device for detecting High pressure pressure gauge for oil pressure. 6. A kind of HGIS/GIS circuit breaker hydraulic spring mechanism emergency energy storage device as claimed in claim 5, is characterized in that, between described one-way valve and described pressure measuring joint, draw the high-pressure shut-off valve and the The overflow valve, the other end of the high pressure cut-off valve and the overflow valve communicate with the oil tank through an oil return filter. 7. A kind of HGIS/GIS circuit breaker hydraulic spring mechanism emergency energy storage device according to any one of claims 1-6, characterized in that, an air filter and a liquid level gauge are further arranged on the oil tank at least one of the . 8. A HGIS/GIS circuit breaker, which at least includes a switch energy storage mechanism, and the switch energy storage mechanism at least includes an energy storage motor, a PE8 plunger pump gear, an energy storage piston, an energy storage disc spring column, a pressure release lever and The pilot valve, the switch energy storage mechanism is connected with a high-pressure oil cylinder; it is characterized in that the HGIS/GIS circuit breaker is further provided with the hydraulic spring mechanism emergency energy storage device according to any one of claims 1-7.