1. Overview

ZW32-12/MThe type of permanent magnet vacuum circuit breaker adopts a uniquely designed permanent magnet mechanism and a highly reliable intelligent controller. This device is mainly used in medium voltage overhead power grids, asUsed for dividing and combining load current, overload current, and short-circuit current, and has0～3Automatic reclosing.

u Extremely high reliability

u Completely maintenance free throughout the entire lifespan

u Has high mechanical and electrical lifespan

u The whole machine has a small volume, light weight, and is easy to install

u Equipped with standard relay protection and fast automatic reclosing function

1.1 Conditions of Use

¨ Surrounding air temperature:-30℃～+60℃；

¨ Altitude: not exceeding3000Rice;

¨ Wind speed not exceeding34m/s；

¨ Vibration or ground motion from outside the switchgear and control equipment can be ignored;

¨ Pollution level: Level IV;

¨ storage temperature-40℃～+85℃.

1.2 Technical Parameter

Main technical parameters of circuit breaker

Main mechanical parameters of circuit breakers

Main technical specifications of the controller

2 Structure and working principle of circuit breaker

ZW32-12/MThe vacuum permanent magnet circuit breaker is mainly composed of integrated fixed sealed pole, current transformer, permanent magnet operating mechanism, and box body. This model of circuit breaker is designed for miniaturization, with a high-quality casingstainless steelBox body. Simultaneously equipped with a manual emergency disconnection device.Isolation switches and current transformers can be selected according to user needs.

ZW32-12/MOutline drawing of circuit breaker

ZW32-12/MThe control of the type permanent magnet vacuum circuit breaker is completed by a matching intelligent control unit. The switch can be opened and closed locally, or remotely through a communication interfaceRemote control operation. Other information of the circuit breaker can also be transmitted to the control center, and communication channels can be selected from cables, optical fibersGPRS/CDMA、GSMWait.

The intelligent control unit is installed close to the circuit breaker and connected to it through control cables. The power supply of the intelligent control unit is divided into main and backup power supplies, with the main power supply beingACperhapsDC 220V, byHigh voltage transmission linesPTobtain; The backup power is provided by the battery (installed in the intelligent control unit box). When working normally, the main power supply charges the backup power supply; When the main power supply is lost, the backup power supply can still complete the control of the circuit breaker and other operations within the control unit. The backup power supply (when fully loaded) can maintain the entire machine at least48Working hours.

The circuit breaker operating mechanism is equipped with a manual emergency opening handle, which is used for emergency opening operation in case of control system or power failure.

Working principle and process of circuit breaker

Arc extinguishing principle:

ZW32-12/MThe type of vacuum permanent magnet circuit breaker adopts a vacuum arc extinguishing chamber, which uses vacuum as the arc extinguishing and insulation medium, and has a very high vacuum degree. When the moving and stationary contacts are in the operating mechanism

When the charged circuit is opened under the action, a vacuum arc will be generated between the contacts. At the same time, due to the special structure of the contacts, an appropriate longitudinal magnetic field will also be generated in the gap between the contacts, promoting

Keep the vacuum arc in a diffusion type and evenly distribute the arc on the contact surface for combustion, maintain a low arc voltage, and remove residual ions and electrons when the current naturally crosses zero

Metal vapor can recombine or condense on the contact surface and shielding cover in microseconds, and the dielectric insulation strength of the arc extinguishing chamber fracture is quickly restored, resulting in an arc

Extinguished to achieve the purpose of disconnection. Due to the use of longitudinal magnetic field control for vacuum arc, vacuum circuit breakers have strong and stable breaking current capability.

Energy storage:

ZW32-12/MThe opening and closing energy of the vacuum permanent magnet circuit breaker is stored in high-performance capacitors, which are installed inside the intelligent controller unit box. Instantaneous opening and closing of the circuit due to the capacitor

The discharge provides energy. The charging energy of the capacitor is provided by the main or backup power supply of the control unit, and the charging time is not more than10sCapacitor voltage error ≤1V.

Closing operation:

Press the closing button on the intelligent control unit locally or remotely control the closing operation to activate the closing coil of the operating mechanism, causing the iron core to drive the moving contact of the circuit breaker to press

Regulate the closing speed. When it is determined that the circuit breaker is in the closed position, the control circuit automatically disconnects the power supply of the closing coil, and at this time, the iron core remains closed due to the action of the permanent magnet

On the circuit breaker side, after the closing coil is de energized, it not only overcomes the reaction force of the circuit breaker contact spring, but also has a closing self-protection holding force, ensuring that the circuit breaker is reliably kept closed

Gate position.

Opening operation:

Press the disconnect button on the intelligent control unit locally or remotely control the disconnect operation to activate the disconnect coil of the operating mechanism, overcoming the self-protection of the permanent magnet on the closing side

Simultaneously holding the force, the opening spring pulls the iron core to drive the moving contact of the circuit breaker to open at the specified speed. When it is determined that the circuit breaker is in the open position, the control circuit automatically opens the circuit breaker line

The power supply of the coil is disconnected, and at this time, the iron core remains on the opening side due to the tension of the opening spring, ensuring that the circuit breaker is reliably held in the opening position.

Manual emergency disconnection operation:

When the circuit breaker is in the closed position, use an insulated operating rod to hook the pull ring on the manual opening handle of the circuit breaker and pull it downwards. The circuit breaker can be opened while still having one

The set opening speed can ensure that the circuit breaker can reliably disconnect the rated load current.

3 intelligent control unit

The intelligent control unit is an outdoor controller designed specifically for medium voltage permanent magnet switches. Can easily cooperate with the pole mounted permanent magnet switch to achieve opening and closing management, and provide line protection functionAnd automatic reclosing function. Installation of controller close to circuit breakerUsed as an electronic operating mechanism and intelligent protector for permanent magnet switches.

¨ Opening and closing operation of permanent magnet mechanism

¨ Line protection function

¨ Automatic reclosing

¨ Communication function with the control center

¨ Uninterrupted power supply for each component

¨ Switch position detection

¨ System power measurement

¨ Remote control function

¨ Wireless data transmission (optional)

¨ Historical operation save

3.1 Circuit breaker opening and closing management

¨ Local control of opening and closing through the controller operation panel

¨ Remote control operation of circuit breaker opening and closing through remote communication

¨ Handheld remote control controls the opening and closing of circuit breakers（30Effective within meters

¨ pass throughGSMMobile SMS control for opening and closing

3.2 Line protection function

¨ Quick break protection (relative phase)

scope of protection0.2In～20In step length0.01A

time frame0s～600.00s step length0.01s

InFor the rated current on the secondary side, it is usually chosen1Aperhaps5A

¨ Definite time overcurrent protection(Relative phase)

scope of protection0.2In～20In step length0.01A

time frame0s～600.00s step length0.01s

¨ Single phase grounding overcurrent protection (relative ground, center point grounding system selects this function)

scope of protection0.2In～20In step length0.01A

time frame0s～600.00s step length0.01s

¨ Inverse time overcurrent protection

The inverse time interval overcurrent curve satisfies the following four conditionsIECCurve, timed return after protective action.

General inverse time characteristic: （1）

Extreme inverse time characteristic: （2）

Reverse time limit characteristics: （3）

Long inverse time characteristic: （4）

Among them:t-Action time（S）

^tp-Curve multiplier

Ip- Starting current, value range ＜20

¨ ¨ Automatic reclosing protection

Overlapping times1～3Next choice

Operation cycle: divided into -0.1s- Integration and Separation -3s- Combination and separation-6sOn-off-60srestore

Overlap interval time: one overlap interval 0～600.00s step length0.01s

Secondary overlap interval 0～600.00s step length0.01s

Three overlapping intervals 0～600.00s step length0.01s

¨ Acceleration section protection

After manually closing the circuit breaker at the fault point, the circuit breaker accelerates tripping and locks closing, with continuously adjustable protection range and time.

scope of protection0.2In～20In step length0.01A

time frame0s～600.00s step length0.01s

¨ Signal acquisition of switch body and non electricity protection function with special requirements

Light gas alarm, heavy gas trip protection

¨ Each protection value and protection time can be adjusted through the LCD control panel

3.3 Signal quantity monitoring

¨ Circuit breaker working status detection (divided into/Close position)

¨ Control circuit voltage detection, when low voltageAlarm and lock the closing and opening operations

¨ Battery undervoltage alarm

¨ passiveDC110VThe above input voltage, photoelectric isolation, and strong anti-interference ability

¨ common8Road switch signal input

3.4 Measurement function

¨ All measurement quantities can be displayed on the LCD screen through the operation panel

3.5 Historical operation save

¨ SOERecording: Record and save various important information and user operation information that occur on the line, with time stamps and a minimum resolution of up to2ms. Recyclable storage64groupSOEevent.

¨ Can record the current value at the time of line protection, with time stamps.

¨ SOEThe event can be queried on the LCD panel or through remote communication.

3.6 Self diagnostic protection function

¨ Device self-test:RAM、FLASH、UART、A/DRegular self inspection of control circuit voltage, etc. Any malfunction will be displayed through the panel alarm and the corresponding operation will be locked.

¨ Receive timing commands from the main or sub stations, synchronize with the system clock, and enhance the comparability of time recording.

3.7 High protection level

The controller box is made of high-quality stainless steel material, with a brushed surface treatment and a beautiful and elegant appearance. Can prevent corrosion, accidental damage, UV damage, and high-frequency attenuationReduce. Outdoor wall mounted installation with good protective capabilities. The protection level shall not be lower thanIP54.

3.8 communication model

¨ Controller equipped with standardRS232Communication port, can communicate locally or remotely through serial protocol, communication protocol supportsIEC870-5-101Waiting for the agreement.

¨ The controller is equipped with a wireless network card interface, which is located at a distance from the local device500Within the meter, it is convenient to perform microcomputer queries and configure data, without the need for pole operation to query all operating information of the device, suitable for short-range network communication transmission.

4 Typical application scheme

¨ Operation panel: located in the upper part of the box, it can be used to operate switches on and off, as well as to check the operating status;

¨ LCD interface: built-in controller128×64Dot matrix LCD, located on the operation panel, can be easily queried and modified;

¨ RF remote control: at a distance from the device50The handheld remote control within the meter can operate the switch on and off;

¨ WLAN(Optional)：At a distance from the local device500Within the meter, it is convenient to perform microcomputer queries and configure data, without the need for pole operation to query all operating information of the device, suitable for short-range network communication transmission.