WO2018010372A1

WO2018010372A1 - Intelligent circuit breaker for shunt capacitor bank switching based on flexible opening and closing technology

Info

Publication number: WO2018010372A1
Application number: PCT/CN2016/109926
Authority: WO
Inventors: 姚卫东; 单金明; 王春华; 顾勇; 宋玉锋; 顾曹新; 孟领刚; 沈卫峰; 顾明锋; 王军; 丁菊
Original assignee: 江苏现代电力科技股份有限公司
Priority date: 2016-07-15
Filing date: 2016-12-14
Publication date: 2018-01-18
Also published as: CN106024496A; CN106024496B

Abstract

An intelligent circuit breaker for shunt capacitor bank switching based on a flexible opening and closing technology, comprising three poles A, B and C and an intelligent controller D. Three-phase power supplies UA, UB and UC are respectively connected with the three poles A, B and C; two ends of a shunt capacitor C1 are respectively connected with the poles A and B; two ends of a shunt capacitor C2 are respectively connected with the poles B and C; two ends of a shunt capacitor C3 are respectively connected with the poles A and C; each of the three poles A, B and C comprises a conductive and arc-extinguishing component (1), a first stroke sensing component (2), a closing damping component (3), a high-voltage insulated component (4), an opening and closing driving component (5), an opening damping component (6), and a second stroke sensing component (7) sequentially connected in series in an axial direction. The intelligent circuit breaker for shunt capacitor bank switching based on the flexible opening and closing technology features a simple structure, reliable operation, convenient maintenance, and a high price-performance ratio; a shunt capacitor bank can be switched frequently; the reactive power compensation equipment for shunt capacitor bank switching achieves effects of reducing loss and saving energy of a power grid, and improving the transmission capacity and electric energy quality of the power grid.

Description

Intelligent circuit breaker for switching capacitors of shunt capacitor banks based on flexible switching technology

Technical field

The invention relates to a smart circuit breaker, in particular to a smart circuit breaker for switching a parallel capacitor bank based on a flexible opening and closing technology.

Background technique

According to the reactive power change of the power grid, the shunt capacitor bank is put into the power grid and cut off from the power grid. It is an important technical measure and equipment for energy saving and consumption reduction, improving power grid output and improving power quality of the power grid. The high-voltage shunt capacitor bank uses a high-voltage circuit breaker (or high-voltage contactor) for switching switches in the power grid. In recent years, due to the rapid development of intelligent electrical switching technology, high-voltage circuit breakers have developed in the direction of intelligence. One switch, current transformer, voltage transformer and secondary automation equipment have been combined to become intelligent circuit breakers, except for one circuit breaker. In addition to functions, it also has integrated automation (or intelligent) functions such as measurement, control, protection, signal, self-diagnosis, and networking.

The existing high-voltage circuit breaker or intelligent circuit breaker casts a shunt capacitor bank, and its main disadvantage is that the opening and closing process is not "flexible", that is, the moving contact movement during unwinding is uncontrollable, so that the moving contact is in The time when the static contact is closed or disconnected is random, and bounces and bounces, so that the switching shunt capacitor bank generates a large closing current and an overvoltage, and the grid, the shunt capacitor bank and the switch itself have A large damaging impact, at the same time can not frequently cut the parallel capacitor bank, affecting the social and economic benefits of the reactive power compensation equipment of the shunt capacitor bank.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides a high voltage intelligent circuit breaker for shunt capacitor bank switching based on a flexible opening and closing technique.

To achieve the above object, the present invention adopts the following technical solutions:

A smart circuit breaker for shunt capacitor bank switching based on flexible switching technology, characterized in that: three poles A, B, C and intelligent controller D for controlling three-phase power supply UA, UB, UC on and off The three-phase power sources UA, UB, and UC are respectively connected to the three poles A, B, and C. The two ends of the parallel capacitor C1 are respectively connected to the poles A and B, and the two ends of the parallel capacitor C2 are respectively connected to the poles B and C. The two ends of the parallel capacitor C3 are respectively connected to the poles A and C. The three poles A, B and C respectively comprise conductive and arc extinguishing components, a first stroke sensing component, a closing damping component and a high voltage which are axially connected in series. Insulation parts, opening and closing drive a component, a trip damping component, and a second stroke sensing component.

In order to optimize the above technical solutions, the specific measures taken include:

The conductive and arc extinguishing member comprises a housing a, a static contact, a movable contact, an arc extinguishing medium or a vacuum is arranged in the housing a, the static contact is fixed on the upper end of the housing a, and the movable contact is slidably disposed in the housing a lower end.

The first stroke sensing component comprises a grating piece a and two light guiding bodies, and a lower end of the movable contact is provided with an extending portion extending vertically downward, and the grating piece a is vertically disposed and fixed in the extending section, and the two guiding light The body is disposed on both sides of the grating sheet and the light guiding body is connected to the intelligent controller D.

The light guide has insulating properties.

The closing damping member comprises a shaft a, a housing b, a piston a, a sealing plate, a tapered thimble and a spring, the housing b is a sealed housing, and the shaft a is slidably disposed at an upper end of the housing b in a vertical direction, the piston a Fixed on the shaft a and slidably disposed on the inner wall of the casing b, the sealing plate is horizontally disposed and fixed on the inner wall of the casing b, and the piston a and the sealing plate divide the inner cavity of the casing b into the upper damping liquid chamber above the piston a a chamber a, a lower damping fluid chamber a between the piston a and the sealing plate, and a cavity at the lower side of the sealing plate, the spring is sleeved at the lower end of the shaft a and the spring is located between the piston a and the sealing plate, the sealing plate The through hole is matched with the shaft a. The lower end of the shaft a is slidably disposed in the through hole of the sealing plate, the piston a is provided with a tapered pin hole, and the upper end of the housing b is provided with a tapered ejector pin a corresponding to the tapered pin hole.

The opening and closing drive component comprises a shaft b, an iron casing, a closing coil, a permanent magnet, a trip coil and a pin, the shaft b is vertically disposed and the two ends of the shaft b are slidably disposed in the upper and lower end faces of the iron casing The permanent magnet is fixed on the shaft b by a pin, the closing coil is sleeved on the upper end of the permanent magnet, and the opening coil is sleeved on the lower end of the permanent magnet.

The opening damping component comprises a shaft c, a casing c and a piston b, the shaft c is vertically disposed and the upper and lower ends of the shaft c are slidably disposed on the upper and lower end faces of the casing c, and the casing c is a sealed casing and the chamber of the casing c Filled with a damping fluid, the piston b is fixed on the shaft c and the piston b is slidably disposed on the inner wall of the casing c, and the piston b separates the chamber of the casing c into the upper damper chamber b and the lower damper chamber b, the piston An overflow hole is opened in the b, and a tapered thimble b corresponding to the overflow hole is disposed at the lower end of the casing c.

The second stroke sensing component comprises a grating piece b, a transmitting head and a receiving head, wherein the grating piece b is vertically fixed at a lower end of the shaft c, and the transmitting head and the receiving head are correspondingly disposed on both sides of the grating piece and respectively electrically connected with the intelligent controller D connection.

The moving contact is connected with one end of the resistor R1, the static contact is connected with the resistor R2, the current transformer L is arranged on the parallel capacitor circuit, the other ends of the resistors R1 and R2 and the current transformer L and the intelligent controller D connection.

The invention has the advantages of simple structure, reliable operation, convenient maintenance, high cost performance, frequent switching of the parallel capacitor bank, and the reactive power compensation device for switching the parallel capacitor bank to improve energy saving, transportation capacity and improvement of the power grid. The effect of grid power quality.

DRAWINGS

1 is a schematic view of a smart circuit breaker for switching a parallel capacitor bank based on a flexible opening and closing technique of the present invention.

2 is a partial enlarged view of a smart circuit breaker for shunt capacitor bank switching based on the flexible switch-off technique of the present invention.

3 is another partial enlarged view of the smart circuit breaker for shunt capacitor bank switching based on the flexible switch-off technology of the present invention.

detailed description

The invention will now be described in further detail with reference to the drawings.

As shown in the figure, a smart circuit breaker for switching a parallel capacitor bank based on a flexible opening and closing technology according to the present invention comprises three poles A, B, and C for controlling the three-phase power supply UA, UB, and UC to be turned on and off. The intelligent controller D, the three-phase power supply UA, UB, UC are respectively connected with the three poles A, B, C, and the two ends of the parallel capacitor C1 are respectively connected with the poles A and B, and the two ends of the parallel capacitor C2 are respectively connected with the poles B And C connection, the two ends of the parallel capacitor C3 are respectively connected with the poles A and C, and the three poles A, B and C respectively comprise the conductive and arc extinguishing members 1 and the first stroke sensing component 2 which are axially connected in series. The closing damper member 3, the high-pressure insulating member 4, the opening and closing drive member 5, the opening damper member 6, and the second stroke sensing member 7.

The conductive and arc extinguishing member 1 comprises a housing a8, a static contact 9, and a movable contact 11. The arc extinguishing medium 10 or vacuum is disposed in the housing a8, the static contact 9 is fixed on the upper end of the housing a8, and the movable contact 11 slides. It is disposed at the lower end of the housing a8. The first stroke sensing component 2 includes a grating piece a14 and two light guiding bodies 15, 16, and a lower end of the movable contact 11 is provided with an extending portion 13 extending vertically downward, and the grating piece a14 is vertically disposed and fixed on the extending portion 13. Two light guides 15, 16 are disposed on both sides of the grating sheet 14 and the light guides 15, 16 are connected to the intelligent controller D. The light guides 15, 16 have insulating properties.

The closing damping member 3 includes a shaft a17, a housing b18, a piston a20, a sealing plate 22, a tapered thimble 24 and a spring 26, and the housing b18 is a sealed housing, and the shaft a17 is slidably disposed at an upper end of the housing b18 in a vertical direction. The upper end of the shaft a17 is fixedly connected with the lower end of the extension portion 13, and the piston a20 is fixed on the shaft a17 and slidably disposed On the inner wall of the casing b18, the sealing plate 22 is horizontally disposed and fixed on the inner wall of the casing b18, and the piston a20 and the sealing plate 22 divide the inner cavity of the casing b into the upper damping liquid chamber a19 above the piston a20, and the piston a20 The lower side damping fluid chamber a21 between the sealing plate 22 and the cavity chamber 23 on the lower side of the sealing plate 22, the spring 26 is sleeved at the lower end of the shaft a17 and the spring 26 is located between the piston a20 and the sealing plate 22, the sealing plate 22 The upper opening has a through hole matching with the shaft a17. The lower end of the shaft a17 is slidably disposed in the through hole of the sealing plate 22. The piston a20 is provided with a tapered pinhole 25, and the upper end of the housing b18 is provided with a cone corresponding to the tapered pinhole 25. Shape thimble a24.

The upper end of the high-voltage insulating member 4 is provided with a blind hole matched with the housing b18, the lower end of the housing b18 is fixed in the blind hole, the metal member 27 is vertically disposed, and the upper end of the metal member 27 is fixed to the lower end of the high-voltage insulating member 4.

The opening and closing drive member 5 includes a shaft b28, an iron casing 29, a closing coil 30, a permanent magnet 31, a trip coil 32, and a pin 33. The shaft b28 is vertically disposed and the ends of the shaft b28 are slidably disposed on the iron shell. In the upper and lower end faces of the body 29, the upper end of the shaft b28 is fixedly connected to the lower end of the metal member 27, the permanent magnet 31 is fixed to the shaft b28 by the pin 33, the closing coil 30 is sleeved on the upper end of the permanent magnet 31, and the opening coil 32 is sleeved in the permanent The lower end of the magnet 31.

The opening damping member 6 includes a shaft c34, a housing c35 and a piston b37. The shaft c34 is vertically disposed and the upper and lower ends of the shaft c34 are slidably disposed on the upper and lower end faces of the housing c35, and the housing c35 is a sealed housing and the chamber of the housing c35 is charged. There is a damping fluid, the piston b37 is fixed on the shaft c34 and the piston b37 is slidably disposed on the inner wall of the casing c35. The piston b37 divides the chamber of the casing c35 into the upper damper chamber b36 and the lower damper chamber b38, the piston b37 An overflow hole 39 is opened in the upper portion, and a tapered thimble b40 corresponding to the overflow hole 39 is provided at the lower end of the casing c. The second stroke sensing member 7 includes a grating piece b41, a transmitting head 42, and a receiving head 43, the grating piece b41 is vertically fixed at the lower end of the shaft c34, and the transmitting head 42 and the receiving head 43 are correspondingly disposed on both sides of the grating piece 41 and respectively associated with the smart Controller D is electrically connected.

The movable contact 9 is connected to one end of the resistor R1, the static contact 11 is connected to the resistor R2, the current transformer L is disposed in the parallel capacitor circuit, and the other ends of the resistors R1 and R2 and the current transformer L are connected to the intelligent controller D.

Switching principle of switching capacitor bank:

Closing and commissioning the parallel capacitor bank process: When the intelligent controller D receives the closing signal, the closing coil 30 is energized, and the permanent magnet 31 and the shaft b28 are driven upward, and the high-voltage insulating member 4 is passed to make the extension 13 and the dynamic contact The head 11 is in contact with the stationary contact 9, and the parallel capacitors C1, C2, and C3 are turned on and supplied to the three-phase power sources UA, UB, and UC. After the movable contact 11 and the stationary contact 9 are in contact, the permanent magnet 31 continues to move forward. When the permanent magnet 31 is in contact with the iron housing 29 and is sucked, the closing coil 30 is kept closed after the power is turned off, and the lower damping fluid chamber a21 is compressed, so that the movable contact 11 is in contact with the static contact 9 and has a certain Contact pressure.

Opening and returning the parallel capacitor bank process: When the intelligent controller D receives the trip signal, the trip coil 32 is energized, the permanent magnet 31 is driven, the shaft b28 is driven downward, and the extension 13 and the movable contact are made through the high-voltage insulating member 4. The head 11 is out of contact with the stationary contact 9, and the parallel capacitors C1, C2, C3 are disconnected from the UA, UB, UC and are taken out of operation.

Flexible Splitting Principle: The intelligent controller D monitors the moving condition of the opening and closing drive member 5 from the second stroke sensing member 7, and monitors the movement of the extension 13 and the movable contact 11 from the first stroke sensing member 2. And controlling the operating current of the closing coil 30 (or the opening coil 32), the second stroke sensing member 7, the first stroke sensing member 2, the closing coil 30 (or the opening coil 32), and the intelligent controller D forms a double closed-loop automatic control system with flexible closing (or opening), which makes the closing (or opening) have the characteristics of fast speed, short time and no bounce and rebound.

Soft collision principle: the closing damping component 3 is used for the soft collision of the closing. When the extension 13 and the moving contact 11 and the stationary contact 9 are far apart during the closing process, the tapered pinhole 25 is not blocked, damping The liquid easily flows from the upper damping fluid chamber a19 to the lower damping fluid chamber a21, and the closing damping is small. When the extending portion 13 and the moving contact 11 are closer to the stationary contact 9, the tapered ejector pin a24 and the cone The closer the pinhole 25 is, the more and less the damping fluid flows to the lower damping fluid chamber a21, and the damping force becomes larger and larger, so that the contact between the extension 13 and the movable contact 11 and the stationary contact 9 has a soft collision. Features to avoid bounce. The opening damping member 6 is used for opening the soft collision. When the extension 13 of the opening process and the movable contact 11 are close to the fixed contact 9, the overflow hole 39 is not blocked, and the damping fluid is easily damped from the lower side. The chamber b38 flows to the upper side damper chamber b36, and the opening damping is small. When the extension portion 13 and the movable contact 11 are separated from the fixed contact 9, the closer the overflow hole 39 and the tapered thimble b40 are, the damping fluid becomes more and more It is not easy to flow to the upper side damper chamber b36, and the damping force is getting larger and larger, so that the extension section 13 and the movable contact 11 have soft collision characteristics when they return to the end point, and avoid bounce.

Principle of zero-crossing switching parallel capacitor bank: When closing, the intelligent controller D detects the phase of the AC voltage at the two ends of the switch through the resistors R1 and R2, and detects the stroke, speed, etc. of the extension 13 and the moving contact 11 through the stroke sensing unit 2. The mechanical parameter is obtained by controlling the current on and off of the closing coil 30 and sizing the time point at which the extension 13 and the moving contact 11 are in contact with the stationary contact 9 at a zero-crossing point of the voltage phase, thereby realizing the zero-crossing of the parallel capacitor bank. Commissioned. At the time of opening, the intelligent controller D detects the phase of the alternating current passing through the switch through the current transformer L, and detects the stroke and speed of the extended section 13 and the movable contact 11 through the stroke sensing section 2. The mechanical parameters such as degree, by controlling the current on and off and the size of the opening coil 32, the time point at which the extension 13 and the movable contact 11 and the fixed contact 9 are separated are located at the zero-crossing point of the current phase, thereby realizing the parallel capacitor bank. Zero return shipment.

The above description in this specification is merely illustrative of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the scope of the present specification or beyond the scope defined by the claims. It belongs to the scope of protection of the present invention.

Claims

A smart circuit breaker for shunt capacitor bank switching based on flexible switching technology, characterized in that: three poles A, B, C and intelligent controller D for controlling three-phase power supply UA, UB, UC on and off The three-phase power sources UA, UB, and UC are respectively connected to the three poles A, B, and C. The two ends of the parallel capacitor C1 are respectively connected to the poles A and B, and the two ends of the parallel capacitor C2 are respectively connected to the poles B and C. The two ends of the parallel capacitor C3 are respectively connected to the poles A and C. The three poles A, B and C respectively comprise conductive and arc extinguishing components, a first stroke sensing component, a closing damping component and a high voltage which are axially connected in series. Insulation member, opening and closing drive member, opening and damping member, and second stroke sensing member.
The intelligent circuit breaker for switching a parallel capacitor bank according to the flexible opening and closing technology according to claim 1, wherein the conductive and arc extinguishing member comprises a housing a, a static contact, a movable contact, and a housing An arc extinguishing medium or vacuum is arranged in a, the static contact is fixed on the upper end of the casing a, and the movable contact is slidably disposed at the lower end of the casing a.
A smart circuit breaker for switching a parallel capacitor bank based on a flexible switching technology according to claim 2, wherein said first stroke sensing member comprises a grating piece a and two light guiding bodies, and the moving contact The lower end is provided with an extension extending vertically downward, the grating piece a is vertically disposed in the extension, the two light guides are disposed on both sides of the grating piece and the light guide is connected to the intelligent controller D.
The intelligent circuit breaker for switching a parallel capacitor bank according to the flexible opening and closing technique according to claim 3, wherein the light guide body has an insulating property.
The intelligent circuit breaker for switching a shunt capacitor bank based on a flexible opening and closing technology according to claim 1, wherein the closing damping member comprises a shaft a, a housing b, a piston a, a sealing plate, and a cone a thimble and a spring, the housing b is a sealed housing, the shaft a is slidably disposed at an upper end of the housing b in a vertical direction, the piston a is fixed on the shaft a and slidably disposed on the inner wall of the housing b, and the sealing plate is horizontally disposed and fixed On the inner wall of the casing b, the piston a and the sealing plate divide the inner cavity of the casing b into an upper damping liquid chamber a above the piston a, a lower damping liquid chamber a between the piston a and the sealing plate, and a sealing plate a lower chamber, a spring sleeve is disposed at a lower end of the shaft a, and a spring is located between the piston a and the sealing plate. The sealing plate is provided with a through hole matching the shaft a, and the lower end of the shaft a is slidably disposed in the through hole of the sealing plate. The piston a has a tapered pin hole, and the upper end of the casing b is provided with a tapered ejector pin a corresponding to the tapered pin hole.
The intelligent circuit breaker for switching a parallel capacitor bank according to the flexible opening and closing technology according to claim 1, wherein the opening and closing driving component comprises a shaft b, an iron casing, a closing coil, and a permanent magnet. , the opening coil and the pin, the shaft b is vertically disposed and the two ends of the shaft b are slidably disposed in the upper and lower end faces of the iron casing, The permanent magnet is fixed on the shaft b by a pin, the closing coil is sleeved on the upper end of the permanent magnet, and the opening coil is sleeved on the lower end of the permanent magnet.
The intelligent circuit breaker for switching a parallel capacitor bank according to the flexible opening and closing technology according to claim 1, wherein the opening damping member comprises a shaft c, a casing c and a piston b, and the shaft c is vertically disposed And the upper and lower ends of the shaft c are slidably disposed on the upper and lower end faces of the casing c, the casing c is a sealed casing and the chamber of the casing c is filled with damping fluid, the piston b is fixed on the shaft c and the piston b is slidably disposed on the inner wall of the casing c Upper, the piston b divides the chamber of the casing c into an upper damper chamber b and a lower damper chamber b, the piston b has an overflow hole, and the lower end of the casing c is provided with a taper corresponding to the overflow hole. Thimble b.
A smart circuit breaker for switching a shunt capacitor bank based on a flexible switching technology according to claim 7, wherein said second stroke sensing member comprises a grating piece b, a transmitting head, a receiving head, and a grating piece b It is vertically fixed at the lower end of the shaft c, and the transmitting head and the receiving head are correspondingly disposed on both sides of the grating piece and electrically connected to the intelligent controller D, respectively.
The intelligent circuit breaker for switching a parallel capacitor bank based on the flexible opening and closing technology according to claim 2, wherein the movable contact is connected to one end of the resistor R1, the static contact is connected to the resistor R2, and the current transformer L is disposed on the parallel capacitor circuit, and the other ends of the resistors R1 and R2 and the current transformer L are connected to the intelligent controller D.