ZWC□-40.5/L1600A-31.5 Type Open Combination Electrical ApplianceDetailed product description：

1.1 ZWC □ -40.5/L1600A-31.5 open combination electrical apparatus is a complete set of combination electrical apparatus that uses air as the external insulation SF6 gas as the arc extinguishing medium Control and protection of 40.5KV transmission and distribution system for three-phase AC, and can also be used for connecting circuit breakers and opening and closing capacitor banks Suitable for urban substations, enterprise substations, and mountainous substations with tight land use. This product has the following characteristics:

1) Organically combine circuit breakers, isolating switches, grounding switches, current transformers, voltage transformers, lightning arresters, fuses, busbars, and other components on a grounded steel structure bracket, resulting in a compact structure.
2) It occupies only 30% -50% of the space of the split type, and has significant characteristics such as saving land and reducing project costs.
3) The entire interval is prefabricated in the factory, assembled and debugged before leaving the factory, and transported to the installation site as a whole, greatly shortening the installation cycle.
4) Adopting fully validated high-performance arc extinguishing chambers, voltage transformers, composite insulator lightning arresters, and isolating switches, with minimal maintenance and high reliability.
5) The self-supporting busbar prefabricated in the partition factory does not require users to repair the structure.
6) Flexible layout and can be used for various wiring methods.
7) The circuit breaker can be lowered for maintenance or replacement as a whole, and the power outage time can be shortened to at least 3 hours due to body failure.
1.2 ZWC □ -40.5 with excellent configuration
1) Advanced self powered arc extinguishing chamber, with a breaking capacity of 31.5KA, a fully open breaking time of 3 cycles, a simple and reliable structure, and a full capacity breaking capacity of 20 times.
2) The CTB all spring operating mechanism meets the requirements of "oil-free" switches: excellent mechanical characteristics, compact structure, high reliability, and has obtained national patents and technology high-quality products.
3) All isolation switches use composite insulators, with a single arm swing structure that is simple and reliable; Adopting self operated graphite silver plated dispersed copper contact fingers, the structure has good stress performance, strong flow capacity, and maintenance free.
4) All exposed metal parts adopt the most advanced anti-corrosion technology to ensure that there is no corrosion for 20 years under general pollution conditions.
1.3 ZWC □ -40.5 shall comply with national standards GB1984-2003, GB11032-89, GB1985-2004, and meet the requirements of International Electrotechnical Commission standards IEC56, IEC99-4, IEC129, and IEC694. All other components inside meet their respective international requirements.

2 ZWC □ -40.5/L1600A-31.5 type open combination electrical apparatus structure and working principle
2.1 This product is an outdoor product and can also be used outdoors. The environmental conditions for use are as follows
a. Altitude: not exceeding 2000 meters (special orders are not limited)
b. Environmental temperature: -40 ℃ -+40 ℃
c. Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90% (25 ℃)
d. Wind speed: not exceeding 35 meters per second
e. Pollution level IV, nominal creepage distance greater than 31mm/kv
f. No flammable, explosive, chemically corrosive, or violently vibrating environments
g. Seismic intensity: not exceeding 8 degrees
h. Ice thickness not exceeding 10mm

3.3 Current Transformer
0.5 (0.2) level current transformers can be used for measurement and have passed the measurement review. The protective transformer can provide signals for the secondary protection part.
1) Each circuit breaker can be equipped with 3-12 bushing type current transformers (hereinafter referred to as "transformers"), with 1-4 installed under each phase fracture. The winding is immersed in sulfur hexafluoride gas, and the conductive rod and lower support are the primary circuit. The transformer itself only has a circular iron core and a secondary circuit. The secondary circuit output is led to the outside through a well sealed terminal block. The terminal block and the connecting wire to the mechanism box are protected by a cover and steel pipe to prevent direct contact with the atmospheric environment.
2) There are two types of transformers: LR-35, for measurement purposes. LRB-35 type, with a rating of 10P, is used for ordinary protection or differential protection. Each specification has four connectors, which can obtain three current ratios. All output lines of the transformer are led to the panel inside the mechanism box, and users can easily change the current ratio. The technical parameters of the current transformer are shown in Table 3. If they exceed the requirements in the table, the user can negotiate with the manufacturer.
3) When the rated current exceeds 1600A, built-in current transformers cannot be installed.
4) The model and specifications of the transformer attached to the circuit breaker, the current ratio, and the tap connection are determined by the user according to their needs. Each unit is allocated according to the purchase contract when the product leaves the factory.
5) Arrangement of transformers in circuit breakers
The conduction of the transformer is introduced into the wiring board of the mechanism box through a good wiring board, with a wire area of 2.5mm2