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KYN61-40.5 Armored Removable AC Metal-Enclosed Switchgear
1. Product Positioning and Application Scenarios
Applicable System: Three-phase AC 50Hz, rated voltage 40.5kV (35kV class) power systems
Application Scenarios: Power distribution rooms in power plants, substations, industrial and mining enterprises, for power reception, distribution, as well as circuit control, protection and monitoring
Standards Compliance:
GB 3906 AC Metal-Enclosed Switchgear for Rated Voltages of 3kV to 35kV
GB/T 11022 Common Technical Requirements for High-Voltage Switchgear and Controlgear Standards
IEC 60298 AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to and Including 50kV
Model Explanation
Symbol | Meaning |
|---|---|
K | Armored type |
Y | Removable type |
N | Indoor use |
61 | Design sequence number |
40.5 | Rated voltage (kV) |
/ | Separator |
Z | Circuit breaker type (vacuum) |
Subsequent parameters | Rated current, rated short-circuit breaking current (kA) |
Main Parameters of Switchgear
Item | Unit | Parameter |
|---|---|---|
Rated voltage | kV | 40.5 |
Rated frequency | Hz | 50 |
Rated current | A | 630; 1250; 1600; 2000 |
Rated insulation level (lightning impulse withstand voltage) | kV | 185 |
Rated insulation level (power-frequency withstand voltage for 1min) | kV | 95 |
Rated short-circuit breaking current | kA | 20, 25, 31.5 |
Rated short-circuit making current (peak) | kA | 50, 63, 80 |
Rated dynamic stability current (peak) | kA | 50, 63, 80 |
4-second thermal stability current (RMS) | kA | 20, 25, 31.5 |
Ingress protection degree of enclosure | – | IP4X |
Overall dimensions (W × D × H) | mm | 1400×2200×2600 (general type) |
Technical Parameters of Circuit Breakers
Item | Unit | ZN85A-40 3AH3 (Vacuum Circuit Breaker) | SF1/SF2 (SF6 Circuit Breaker) |
|---|---|---|---|
Rated voltage | kV | 40.5 | 40.5 |
Rated current | A | 1250; 1600; 2000 | 630; 1250; 2500 |
Rated short-circuit breaking current | kA | 20, 25, 31.5 | 25, 31.5 |
Opening time | ms | 36–60 | ≤45 |
Closing time | ms | 40–90 | ≤75 |
Rated operating sequence | – | O – 0.3s – CO – 180s – CO | O – 0.3s – CO – 180s – CO |
Modular cabinet: Composed of a fixed cabinet and withdrawable truck, assembled with bolts.
Compartmentalization: Separated by metal partitions into circuit breaker compartment, main busbar compartment, cable compartment and relay instrument compartment, with IP2X between compartments and all metal parts reliably grounded.
Truck interchangeability: Trucks of the same purpose (circuit breaker, PT, metering, isolating trucks, etc.) are interchangeable; interlocks for test/isolation and service positions prevent misoperation.
Safety design: Independent pressure relief channels for main circuit compartments to ensure safe pressure release under fault conditions.
Ambient temperature: Max. +40℃, Min. -10℃
Altitude: ≤1000m
Relative humidity: Daily average ≤95%, monthly average ≤90%
Ambient requirements: Free from corrosion, heavy pollution, flammable gas and severe vibration
Seismic requirement: Seismic intensity ≤ Grade 8
Overall Dimensions (mm)
Item | Specification | Dimension |
|---|---|---|
Height | – | 2650 |
Width | Rated current ≤1600A | 1400 |
Depth | Bottom cable inlet/outlet | 2870 |
Depth | Overhead line inlet/outlet | 2950 |
Internal Structure Description
No. | Component Name | Function |
|---|---|---|
1 | Pressure relief plate | Releases internal pressure during faults to prevent cabinet explosion |
4 | Circuit breaker | Core switching element for circuit on/off and protection |
8 | Current transformer | For current measurement and relay protection |
9 | Cable | Connection for incoming and outgoing cables |
11 | Earthing switch | Earthing during maintenance for personnel safety |
12 | Main busbar | Power transmission between cabinets |
15 | Surge arrester | Lightning protection and overvoltage absorption |
A | Instrument compartment | Installation of secondary instruments and protection devices |
B | Circuit breaker compartment | Installation of circuit breaker truck |
C | Busbar compartment | Installation of main and branch busbars |
D | Cable compartment | Installation of cables, earthing switch, transformers, etc. |
The product provides 43 standard main circuit schemes covering all 35kV power distribution scenarios:
Incoming/outgoing: Overhead/cable incoming and outgoing lines (Schemes 01–06, 21–26, etc.)
Coupling: Left/right coupling, overhead/cable coupling (Schemes 09–20, etc.)
Metering/PT: Metering with overhead incoming, PT cabinets (Schemes 27–35, etc.)
Lightning protection/auxiliary transformer: Arrester cabinets, auxiliary transformer cabinets (Schemes 36–43, etc.)
Special functions: Customized schemes with arresters, PTs, fuses, etc.
Main circuit scheme number, application purpose, layout and arrangement drawing of distribution room
Requirements for control, measurement, protection functions and other enclosed or automatic devices
Model, specification and quantity of electrical components
Busbar bridge requirements: rated current-carrying capacity, span, height above ground, etc.
Description of special environmental operating conditions
Other special requirements to be negotiated with the manufacturer
High safety: Fully enclosed armored structure with complete interlocks meeting five-prevention requirements.
High reliability: Compliant with Chinese and IEC standards; vacuum/SF6 circuit breakers available for different scenarios.
High flexibility: 43 standard schemes plus customized configuration for various 35kV projects.
Easy maintenance: Removable truck design allows maintenance without large-scale power outage, with strong interchangeability.
This product is a 35kV indoor armored removable switchgear, a mainstream choice in domestic 35kV power distribution systems, widely used in power grids, industry, mining and new energy fields.
The vacuum circuit breaker type (ZN85A) is the mainstream selection; SF6 type is suitable for special working conditions.
When ordering, core parameters such as scheme number, rated current, breaking current and component configuration must be specified.
