RU2406199C1 - DEVICE FOR SECTIONING AIR AND CABLE LINES FOR 35 kV POWER SUPPLY SYSTEMS - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device is represented as unit container having high-voltage compartment (A) where vacuum switch (4), pressure relief valve (11), measuring current transformers (14), measuring voltage transformers (13), in-house transformer (12) are installed. Telemechanics and relay protection devices (2) are installed inside control compartment (B). The following equipment is installed on the rood of unit container: overvoltage restrictors (8), horizontal swinging type breakers (7) having their blades (main and grounding) arranged so that they can be actuated from the drive (3). Input contact of vacuum switch (4) is coupled with one of breakers through restrictors (8) and bushing insulator 9. Output contact of vacuum switch (4) is connected with the other breaker (7) through measuring current transformers (14), voltage transformers (13), in-house transformers (12) and overvoltage restrictors (8) connected sequentially.

EFFECT: simplified design, improved comfort of maintenance, protection from unauthorised access and reduced material consumption and prime cost.

3 cl, 2 dwg

Description

The invention relates to the field of electrical engineering, namely to switching equipment, and is intended for switching (the implementation of automatic shutdown, automatic restart, sectioning, automatic input of reserve, melting, ice and network redundancy, etc.) overhead and cable power lines.

A device for overhead cable power lines is known as a recloser (circuit breaker for overhead lines) of the TEL series (RF patent N 2142187, Mcl 6 H02B 13/00, publ. 11/27/99), consisting of a vacuum switch of the TEL series, current current transformer inputs, a protective case, and the vacuum circuit breaker with current transformers and contact leads made in the form of current inputs is enclosed in transparent solid solid insulation, and on top of the insulation is a protective case, the lower part of which is made of bulletproof Biwa weather-resistant glass and allows the device to see clearly the position indicator and visually monitor the performance of the vacuum circuit breaker.

A disadvantage of the known device for automatically turning off overhead lines is the inconvenience associated with mounting / disassembling the device; downtime of linear consumers of electricity, among which there are consumers of the first category of reliability; inconvenience when installing and monitoring the operation of the device, since the control over the work is carried out only visually. In addition, the design of the device allows it to be used only for medium-voltage power lines.

A device for sectioning overhead cable power lines (see Doroshev K.I. Operation of complete switchgear 6-220 kV. M: Energoatomizdat, 1987, p.132-135, Fig.3.35 and Fig.3.36), which includes a complete outdoor switchgear containing a high-voltage compartment in which an electric vacuum switch is located, measuring current transformers in phases "A" and "C", voltage measuring transformers and a control compartment with emergency control devices in the form of a automatic re-inclusion and automatic inclusion of a reserve of a two-stage directional relay maximum current protection, a heating device.

The disadvantage is: inconvenience associated with the installation and dismantling of the sectioning point, downtime of linear consumers of electricity, among which there are consumers of the first category of reliability; inconvenience during transportation to the installation site; relatively large dimensions of the device, low performance.

These shortcomings are due to the presence of a well-known distribution system for a partitioned power line of a sectioning point at a height of several meters, which requires a stationary staircase and simultaneous protection against access by unauthorized persons; lack of telemechanics and alarm systems.

Closest to the claimed device is a complete outdoor switchgear for power supply systems, containing a high-voltage compartment, in which there is an electric vacuum switch, measuring current transformers in phases "A" and "C", voltage measuring transformers and a control compartment with emergency control devices in the form of automatic re-inclusion and automatic inclusion of a reserve, relay maximum current protection of two-stage directed oh, heating devices, according to the invention, the high-voltage equipment and control compartments are located on the platform in one block box, inside the high-voltage compartment on both sides of the vacuum circuit breaker there are two voltage measuring transformers in three-phase design with an additional zero-sequence voltage winding on the low side, an additional measuring transformer zero sequence current with indoor disconnectors installed on different sides of the vacuum circuit breaker contactors equipped with a mechanical interlock with grounding knives and a locking device for the entrance door to the high-voltage compartment and a vacuum circuit breaker drive, sets of valve surge arresters equipped with counters and operation indicators associated with the telemechanics system located in the control compartment, equipped with a guaranteed power supply connected by a cable by lead-in machine with a dry power transformer located in the high-voltage compartment, a heating panel with automatic shutdown, microprocessor relay protection and automation, in addition, the distribution system for sectioning the power transmission line includes a communication corridor, control and control boxes on the nodes of the pipeline valves connected to the control compartment by means of communication lines, the high-voltage compartment is equipped with an automatic valve that relieves pressure, equipped with a signal light equipment mounted on the roof of the block box, and the automatic valve, which relieves pressure, is made in the form located in louvre of the high-voltage compartment of the frame with a rotary vane, connected by means of a limit switch with signal light equipment, which is an orange flashing signal protected by a grid, fed by means of the block contacts of the control box input automaton, the telemechanics complex includes systems for fixing places of short circuit to ground phases of power lines and fixation of places of short circuit between phases, telecontrol, telealarm and emergency telemechanics, overvoltage protection, actuation of an automatic valve that relieves air pressure during a short circuit, unauthorized opening of doors, a communication line, the base of the block box is made with a pit, and the block box is made with a pallet (patent RU No. 2170485, IPC ⁷ H02B 13/00, H02B 5 / 00). This device is designed for high voltage power lines.

It should be noted, such a device is designed for high-voltage power lines up to 220 kV. However, when using it for power lines up to 35, its complex design is unjustified, it has large dimensions, high cost.

The technical result of the invention is to simplify the design, improve serviceability while protecting against unauthorized access, reduce material consumption and cost.

To achieve a technical result in an apparatus for sectioning overhead cable lines made in the form of a block container containing a high-voltage compartment, in which there is a vacuum circuit breaker, measuring current transformers, measuring voltage transformers, auxiliary transformer, pressure relief valve, and also a control compartment with devices telemechanics and relay protection, while the device is also equipped with voltage limiters, horizontal rotary disconnectors, knives which x are made with the possibility of actuation from a drive equipped with an electromechanical locking device for the main knives when the vacuum circuit breaker is turned on, as well as blocking the entrance door to the high-voltage compartment in the presence of high voltage, one of the disconnectors being connected to the input of the vacuum switch and the other to the output through input and output contacts of a vacuum circuit breaker, according to the invention, surge arresters, horizontally-rotary disconnectors are mounted on the roof of the block container, moreover, the input contacts of the vacuum circuit breaker are connected to one of the disconnectors through surge arresters, and the output contacts of the vacuum circuit breaker are connected to another disconnector through series-connected current measuring transformers, parallel-connected voltage transformers, auxiliary transformer and surge arresters.

Moreover, the disconnector drive connected to the devices in the control compartment can be installed on the side wall of this compartment.

In this case, the pressure relief valve may be located in the upper or lower part of the high-voltage compartment in the side wall.

At the same time, a window with protective glazing is installed in the wall separating the high-voltage compartment and the control compartment.

Between the distinguishing features and the achieved technical result, there is the following causal relationship.

Unlike analogs and prototypes, the claimed embodiment of the device significantly reduces its cost, since it allows the use of high-voltage switches with reduced dimensions, designed for indoor installation, reduces the dimensions of the unit container by placing individual units on its roof and side walls. Moreover, the device has insulation, designed for operation in networks with a voltage not exceeding 35-40 kV. The device is easy to maintain, does not require expensive pile foundations and lifting equipment for its installation.

The set of essential features of the device is not known from the prior art, which allows us to conclude that the invention meets the criterion of "novelty."

According to the applicant, the essence of the claimed invention does not follow mainly from the prior art, since it does not reveal the above effect on the achieved technical result - a new property of the object - a set of features that distinguish the claimed invention from the prototype, which allows us to conclude that the invention meets the criterion "inventive step".

The set of essential features characterizing the essence of the invention can be reused in production.

The essence of the invention is illustrated by an example of a specific implementation, where:

- figure 1 - schematically shows the inventive device;

- figure 2 is a circuit diagram of a high voltage compartment.

The device is designed as placed on a platform with runners 1 in one unit container in two compartments: a high-voltage compartment A and a control compartment B. Inside the high-voltage compartment A there are a vacuum switch 4, a pressure relief valve 11, measuring current transformers 14, voltage measuring transformers 13 , transformer for own needs 12. Inside the control compartment, telemechanics and relay protection devices are installed 2. Voltage limiters 8 are installed on the roof of the unit container to protect the installation from thunderstorms output and switching overvoltages associated with telemechanics devices, horizontally-rotary disconnectors 7, the main and ground blades of which are made with the possibility of actuation from the drive 3, equipped with an electromechanical locking device for the main knives when the vacuum circuit breaker 4 is turned on, by which the circuit is switched, sectioning the line . The drive 3 is also equipped with a lock of the entrance door to the high-voltage compartment A in the presence of a high voltage in it. Connection to the overhead line is carried out by means of a metal frame on the roof, on which support insulators are mounted 6. High voltage is introduced into the module through bushing insulators 9 through the roof. The input contact of the vacuum circuit breaker 4 is connected to one of the disconnectors through limiters 8 and the bushing 9, and the output contact of the vacuum circuit breaker 4 is connected to another disconnector 7 via buses on the supporting insulators 10, through series-connected current measuring transformers 14, voltage transformers 13, a transformer auxiliary needs 12 and another overvoltage limiter 8 - through bushing insulators 9. The circuit breaker can be controlled automatically or manually from control devices 2. Privo d 3 disconnector 7, also connected to devices in the control compartment, can be installed on the side wall of this compartment. Also, insulators 6 can be installed on the roof to absorb the severity of suitable wires from overhead lines.

The pressure relief valve may be located in the upper or lower part of the high-voltage compartment on the side wall, which is activated when excessive pressure occurs as a result of a short circuit inside the compartment.

In the wall separating the high-voltage compartment A and the control compartment B, there is a viewing window 5 with glazing.

The operation of the device is as follows.

The block container 1 with runners is transported to the installation site on a foundation prepared in advance. In the event of a short circuit and subsequent fire, the automatic valve 11 relieves the air pressure and sends a signal to the telemechanics system of compartment B to turn off the voltage. All devices work. Measuring current and voltage transformers allow you to monitor the state of the circuit by transmitting the current and voltage values to the microprocessor device located in the relay protection cabinet in compartment B. In the event of an emergency, the circuit mode changes, the current and voltage transformers fix it, they transmit a signal to the device protection, then automatically disconnects the damaged section of the circuit. Due to the presence of a voltage transformer, it is possible to produce technical and commercial electricity metering. The auxiliary transformer fully provides all the internal heating, lighting, ventilation, operation of the secondary circuits of the block container. In the event of a loss of supply voltage, the batteries provide secondary circuits for a certain period of time. In the event of a short circuit in the high-voltage compartment under the influence of an arc in the compartment, an overpressure occurs, which is limited by the actuation of the valve. Current transformers 14 installed in the circuit supply a signal to the protection device, which in turn trips the switch 4.

The inventive device has improved performance and increased reliability and ease of maintenance while protecting against access by unauthorized persons, in general, the cost of the device is reduced. It contains everything necessary for the operation of the network at voltages up to 35 kV.

Claims (4)

1. Sectionalization device for overhead and cable lines for 35 kV power supply systems, made in the form of a block container containing a high-voltage compartment, in which there is a vacuum circuit breaker, measuring current transformers, voltage measuring transformers, auxiliary transformer, pressure relief valve, and also a compartment control with telemechanics and relay protection devices, while the device is also equipped with voltage limiters, horizontally-rotary disconnectors, the knives of which are They can be triggered by a drive equipped with an electromechanical locking device for the main knives when the vacuum circuit breaker is turned on, as well as blocking the entrance door to the high-voltage compartment if there is high voltage in it, one of the disconnectors being connected to the input of the vacuum switch and the other to the output through the input and output contacts of a vacuum circuit breaker, characterized in that the surge arresters, horizontal rotary disconnectors are installed on the roof of the block container, the input contacts of the vacuum switch connected to one of the disconnector through the surge arresters, and the output contacts of the vacuum circuit breaker connected to the other disconnector through series-connected current transformers, voltage transformers connected in parallel, and the auxiliary transformer voltage limiters. 2. The device according to claim 1, characterized in that the actuator of the disconnector connected to the devices in the control compartment is mounted on the side wall of this compartment. 3. The device according to claim 1, characterized in that the pressure relief valve is located in the upper or lower part of the high-voltage compartment on the side wall. 4. The device according to claim 1, characterized in that in the wall separating the high-voltage compartment and the control compartment, a glazed window is installed.

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