1.Strong disconnecting ability
2.using arc breaking for small current
3.Small size
4 simple structure
5. maintenance-free
Basic configuration:
A. Using the scheme of ZnO nonlinear resistors
1 set of ZnO nonlinear resistor components
1 set of jumper connector for rotor over-voltage protection
1 DC magnetic circuit breaker
B. Using the scheme of SiC nonlinear resistors
1 set of SiC nonlinear resistor components
1 set of jumper connector for rotor over-voltage protection
1 DC magnetic circuit breaker
Features for de-excitation switch selection
Reasonable selection of rated current
Strong disconnecting ability, using arc breaking for small current
Safe and reliable pressure buildup, with arc voltage reaching the planned value
Small size, simple structure, and maintenance-free
Applicable environment
Altitude: less than 4500 meters
Ambient temperature: -10~45°C
Relative humidity: Not more than 90%
No explosive medium or combustion medium in the environment, and no gas and electricity-conducting dust that can erode metals and ruin insulation in the air.
No violent vibration, hard impact or jolt
Special environmental requirements can be negotiated by both parties.
Instruction on order
Please provide the color disc of the outer covering of cabinet
Please let us know at the order if other sizes are chosen for the cabinet
Functions and features
A. Features of ZnO resistors
Good nonlinear property and large flow rate
With ideal property of constant pressure de-excitation, and fast de-excitation is enabled
Under each operating condition, including extreme accidental de-excitation, the conditions for de-excitation by current inversion remain substantially unchanged
With good property of voltage limiting and the property of blocking can be automatically restored after voltage absorption
Small leakage current, typically less than 50μA, under normal conditions, small dissipated power, and aging speed
B. Features of SiC resistors
Small size, large energy capacity for each unit
Safe and stable performance, for direct use, needing no protective measures
Open-circuit status at faults, without damaging other equipment
Performance | Category | |
Sic | ZnO | |
M(g/cm3) Density M(g/cm3) | 2.4 | 5.4 |
C(/cm3·°C) Specific heat C(/cm3•°C) | 1.7 | 2.8 |
αNonlinear coefficient α | 3~5(typical value 2.8~3.5) | 20~50(typical value 30~40) |
αt(%) Voltage temperature coefficient αt(%) | -0.3~-0.85 | 0.01~0.05 |
w(J/cm3) Energy density w(J/cm3) | 120~260 | 300~700 |
Leakage current A | milliampere level/dozens of volts<0} | microampere level/0.5U10mA |
Permitted operating temperature °C | 130 | 150 |
Permitted ultimate temperature °C | 155 | 185 |
Property of voltage limiting | poor | good |
De-excitation duration | Rather long | shortest |
response speed (μs) | ≤1 | ≤0.05 |
Average energy coefficient<0} | 60%~80% | 90%above |
Service life | long | long |
Operating conditions | With limit for maximum current and maximum voltage | Without limit for maximum current and maximum voltage |
