ZCW10-126

Outdoor compact hybrid switchgear (open-type)

Open-type compact switchgear assembly with air external insulation and SF6 arc quenching for control and protection of three-phase 126 kV networks. The circuit breaker, current transformers and busbars are integrated on a common steel structure, requiring only 30–50 % of the area of a conventional layout.

Key parameters

Rated voltage: 126 kV
Rated current: 1250 A
Rated short-time withstand current: 40 kA
Short-circuit duration: 4 s
Bay width: 3.3 m (standard)

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General information

The ZCW10-126 is an outdoor open-type compact combined switchgear with air external insulation and SF6 as the arc-quenching medium. It is intended for control and protection in three-phase 126 kV AC networks; it can also be used as a bus-section circuit breaker and for switching capacitor banks. Thanks to its compact design, it is optimal for urban, industrial and mountain substations with limited space.

Features

The circuit breaker, current transformers, busbars and other components are integrated on an earthed steel support structure — compact design.
Occupies only 30–50 % of the area required by a conventional separated layout — significant savings in land and construction costs.
The bay is fully assembled, tested and adjusted at the factory and delivered to site as a single unit — installation time is substantially reduced.
Proven high-performance interrupter — virtually maintenance-free, high reliability.
Bays are connected by factory-made self-supporting busbars — no additional support structures required; flexible layout for various connection schemes.
The circuit breaker can be lowered as a whole for repair or replacement; outage time in case of failure is less than 3 hours.

Advantages of the ZCW10-126 configuration

Modern self-blast (auto-puffer) interrupter: 25 kA breaking, total break time 3 cycles, simple and reliable design, 20 breaks at full current.
The CTB spring operating mechanism meets the "oil-free" switchgear requirement: good mechanical characteristics, compactness, high reliability.
Disconnectors with composite insulators, single-column with direct blade rotation — simple and reliable design. Silver-plated copper contacts with graphite coating: high mechanical strength and conductivity, maintenance-free.
All exposed metal parts have a modern anti-corrosion coating — rust-free for 20 years under normal pollution conditions.

The ZCW10-126 complies with the requirements of IEC 56, IEC 99-4, IEC 129, IEC 694.

Service conditions

The product is designed for outdoor installation and can also be installed indoors.

Altitude: not more than 2000 m (higher on special order).
Ambient temperature: −40 °C … +40 °C.
Relative humidity: daily average ≤ 95 %, monthly average ≤ 90 % (at 25 °C).
Wind speed: ≤ 35 m/s.
Pollution level: IV, rated specific creepage distance ≥ 31 mm/kV.
Installation site free from flammable, explosive and chemically aggressive substances and severe vibration.
Seismic intensity: ≤ 8 degrees.
Ice coating thickness: ≤ 10 mm.

Main parameters

Parameter		Unit	Value
Rated voltage		kV	126
Rated frequency		Hz	50
Rated current		A	1250
Rated short-time withstand current		kA	40
Rated peak withstand current		kA	80
Duration of short circuit		s	4
Rated insulation level	Lightning impulse withstand voltage (full wave, peak)	kV	550/630 (across the open gap)
Rated insulation level	Power-frequency withstand voltage (1 min)	kV	230/265 (across the open gap)
Control and auxiliary circuit voltage		V	DC 110, 220; AC 220
Partial discharge level		pC	10
Radio interference level		µV	≤ 2000
Bay width		m	3.3 (standard)

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