Outdoor Vacuum Circuit Breaker MZW38-126

Parameters

 

Operating conditions MZW38-126:

1. Altitude: up to 1000 m.
2. Ambient temperature: from -50°C to + 50°C.
3. Humidity: the average value of relative humidity during the day is not more than 95%; the average value of relative humidity during the month is not more than 90%.
4. Seismic resistance up to 8 points.
5. The environment is not explosive, does not contain dust, aggressive gases and vapors in concentrations that destroy metal and insulation.
6. Life of the circuit breaker 30 years.
7. Warranty period from the date of commissioning — 2 years.
8. Icing Thickness: 25mm

 

Main Parameters MZW38-126:

Rated voltage of direct (alternating) current of switching and disconnecting devices and auxiliary elements 110
drive circuits, V 220 (230)
Resistance with through short-circuit currents with parameters up to the following values:

1. the rms value of the current during its flow for 3 s (current thermal resistance), kA 40 kA
2. current flow time (short circuit time), s 3
3. short Circuit Breaking Capacity: 126
4. — network voltage — up to the highest operating voltage in.r, kV
5. the effective value of the periodic component of the switching current, referred to the moment of termination of contact of the arcing contacts, up to equal to 1 ohm, kA 40
6. the relative content of the aperiodic component of the trip current, referred to the moment of termination of contact 30
7. arcing contacts%, no more — initial rms value of switching current, kA 31.5
8. the largest peak of the switching current, kA 80

The value of the capacitive shutdown current, unloaded lines, disconnected without repeated breakdowns, A, not more than:

1. Airline 31.5
2. Cable line 140

The value of the switched current in the phase mismatch mode, kA 8
Electrical resistance of each pole of the main circuit with a constant current, μOhm, not more than 80
Time of automatic winding of switching springs, s, not more than 15
Own time of circuit breaker opening, ms, no more than 50
Own switch-on time, ms, no more than 120
Total time of circuit breaker opening, ms, no more than 75
The vibration time (bounce) of the contacts of each pole break when turned on, ms, no more than 2.5

The average speed of the moving contacts of each pole when turning on the last 5 mm stroke before closing the contacts, m / s from 0.5 to 1.4
The distance between the contacts of the cameras during shutdown, mm from 15 to 18

1. 10 ms after opening from 19.5 to 22
2. 20 ms after opening

The course of the movable contact of each arcing chamber of the pole from the disconnected position to the closing of the contacts, mm from 27.5 to 30
The preload interval (squeeze) of the preload mechanism of each arc suppressor chamber of the pole after contact closure, mm 10 to 12
Coasting of the movable contact of each arcing chamber of the pole when disconnected, mm, not more than 2.5
Return of the movable contact of each arcing chamber of the pole when disconnected, mm, not more than 2.5
The simultaneous operation of the poles when turning on and off, ms, no more than 3
The simultaneous operation of pole breaks when turning on and off, ms, not more than 1
Number of switching contacts for external auxiliary circuits: 12

1. disconnect 12
2. trailing

The total power of the heating devices with an AC voltage of 230 V 50 Hz, kW: 2

1. shift mechanism 1
2. drive

Nominal power of anti-condensation heating devices with AC voltage 230 V 50 Hz, W: 100

1. shift mechanism 100
2. drive

Insulation resistance of the main circuit under normal climatic factors, MΩ, not less than 10000
Insulation resistance of power and control circuits under normal climatic factors, megohms, not less than 20
The resistance between the grounding bolt and each touchable metal non-conductive part of the switch, which may be energized, Ohm, not more than 0.1

Resource for mechanical resistance, B-tp-O cycles, not less than 10000
Resistance to switching resistance at rated current, VO cycles, not less than 10000
Resistance to switching resistance at rated current of switching off, not less than: 25

1. Operations About 13
2. Operations B

MTBF, V-tp-O cycles, not less than 2000
MTBF, h, at least 3000
The mass of the switch, kg, no more than 2600