China 40.5kV Vacuum Circuit Breaker with Intelligent Control Manufacturer, Supplier, Factory

Kexun Electric Co., Ltd. supplies the ZW7-40.5 as a China factory of 35 kV-and-below switching equipment, and the intelligent-control version is offered as a 40.5kV Vacuum Circuit Breaker with Intelligent Control for sites that want both a local pushbutton and a remote command channel. The breaker passes its operating information to a control centre, while the manual spring-charging handle and the local controls remain on the unit for the day the communications link is down. Rated for 40.5 kV and 1250 to 2500 A, it keeps the same vacuum interrupters and stainless steel box as the standard frame.

Local Control, Remote Command

The intelligent-control combination offers two ways to operate the same breaker: local, from the controls mounted on the box, and remote, sent through a communication interface to the unit. A maintenance crew working on the line uses the local buttons; the dispatch centre uses the remote channel.

Electrical Ratings of the Frame

The control combination sits on the frame whose published ratings are listed below.

Two Surfaces, One Mechanism

A 40.5kV Vacuum Circuit Breaker with Intelligent Control is specified when the operating point is remote from the operator and a local-only switch would demand a drive to the site for every routine open or close.

Cable, Fibre or Radio

The communication interface is not tied to one medium. The breaker exchanges signals over cable, over optical fibre, or by radio on GPRS/CDMA and GSM, which lets an installation match the infrastructure already reaching the pole rather than pulling a new wire for every switch.

Choosing the Medium

Cable suits a substation control room next to the bay. Optical fibre suits a noisy line corridor where induced voltage disturbs a copper pair. Radio suits a remote pole with no cable at all, where the unit reports back over the cellular network.

For a 40.5kV Vacuum Circuit Breaker with Intelligent Control on an overhead section, the choice of medium is usually made by what is already on the tower, because the breaker itself does not favour one over another.

Signals for the Control Centre

Switching state and other operating information of the breaker are passed to the control centre, so the dispatch desk sees the unit state without a site visit. Position indication remains available locally on the unit itself for the crew working at the bay.

What the Desk Sees

Reporting this information is the reason to choose a 40.5kV Vacuum Circuit Breaker with Intelligent Control rather than a conventional local-only unit, because it closes the loop between dispatch and the line.

Keeping Manual Backup

Remote control does not remove the manual route. A hand crank beside the motor charges the closing spring by turning the same gear train, and the closing and opening releases can be operated by hand on the box. If the radio link or the cable is lost, the crew on site can still switch the breaker.

Settings Measured at Commissioning

Commissioning checks compare the unit against the mechanical settings below.

Independence from the Link

The over-current trip coil operates on fault current, so a protection trip works even when the communications link is down. The intelligent system monitors and commands; it does not become the only path to safety.

This manual layer is what a 40.5kV Vacuum Circuit Breaker with Intelligent Control keeps deliberately, because a remote station that cannot be operated locally is a stranded station.

Service Support on Replacement

Where a unit is replaced, the integrator wires the new breaker into the existing cabinet, and the intelligent-control combination still allows local operation and remote operation through the communication interface, with the breaker's operating information sent to the control centre. Kexun answers commissioning questions in English.

Who Stands Behind the Unit

Kexun Electric Co., Ltd. develops, produces, sells and services transmission and distribution equipment at 35 kV and below, with more than 80 skilled technical workers and a research side that feeds the control development. Commissioning questions are answered by export staff who work in English.

Replacement on an existing line is straightforward, because a 40.5kV Vacuum Circuit Breaker with Intelligent Control slots into a cabinet and telemetry scheme that are already in place, with commissioning support answered in English.

Frequently Asked Questions

Q: What communication channels does the intelligent control support?

A: The interface works over cable, optical fibre, GPRS/CDMA and GSM. The choice is usually driven by the infrastructure already reaching the switching point rather than by the breaker itself.

Q: Can the breaker still be operated locally?

A: Yes. Local close, open and spring-charge controls sit on the enclosure, and a hand crank charges the spring when the motor supply is absent. Remote operation is an additional channel, not a replacement.

Q: What information is sent to the control centre?

A: The switching state and other operating information of the breaker are passed to the control centre, while position indication stays available locally on the unit itself.

Q: What happens if the communication link fails?

A: The over-current trip coil operates on fault current independently of the control supply, and the manual charging handle and local releases remain on the box. The breaker can still be switched and will still trip.

Q: What happens when a unit is replaced on an existing line?

A: The integrator wires the new breaker into the existing cabinet, and local and remote operation remain available through the communication interface. Commissioning questions are answered in English.

Q: What control voltage does the unit use?

A: Control supply is AC/DC 220 V for the closing electromagnet, the trip electromagnet and the charging motor, which covers the usual station battery and auxiliary arrangements.

Q: Who provides commissioning support?

A: Kexun Electric Co., Ltd. builds equipment at 35 kV and below, with more than 80 technical workers, and commissioning questions are answered by export staff working in English.

Q: What is the minimum order and warranty?

A: Minimum order is one set, standard models are in stock, and warranty runs 12 to 24 months depending on order terms. Payment is by T/T or L/C, and custom work to drawings is accepted.