Electrical Equipment Chapter 6

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Questions and Answers

What is the nominal voltage for the main circuit?

25 kV AC (correct)

36 kV AC

110 V DC

27.5 kV AC

What is the weight of the equipment?

63 kg

57 kg (correct)

45 kg

70 kg

What is the rated insulation voltage?

110 V DC

27.5 kV AC

25 kV AC

36 kV AC (correct)

What is the dynamic withstand current?

63 kA Signup and view all the answers

What is the tolerance range for the auxiliary voltage?

-30% / +25% Signup and view all the answers

What is the minimum conducting current for gold contacts?

4 mA/24V DC Signup and view all the answers

What is the breaking knife angle of turning?

60 degrees Signup and view all the answers

What is the dielectric test voltage for the control circuit to earth?

1.5 kV Signup and view all the answers

What is the rated operating voltage?

27.5 kV AC Signup and view all the answers

What is the operating pressure range for the pneumatic drive?

0.4 - 1 MPa Signup and view all the answers

What type of circuit breaker is the UR 6?

Air-cooled DC high-speed current-limiting circuit breaker Signup and view all the answers

What is the rated operational voltage of the UR 6 circuit breaker?

1800 V Signup and view all the answers

Which component is NOT part of the UR 6 circuit breaker?

Current transformer Signup and view all the answers

What does the UR 6 circuit breaker do upon detecting a short circuit?

Ensures rapid opening of its main contact Signup and view all the answers

What is the primary function of the switch described in the content?

To ensure switching between two different power supply units. Signup and view all the answers

What is the conventional free air thermal current rating of the UR 6?

1000 A Signup and view all the answers

Where is the switch mounted?

On the traction vehicle roof. Signup and view all the answers

What component is used to control the motion of the moving contact knife?

A pneumatic cylinder. Signup and view all the answers

What material is the fixed insulating frame of the UR 6 circuit breaker made from?

Glass-fibre reinforced insulating material Signup and view all the answers

What is the purpose of the split on the shaft of the switch?

To manage the operation of four auxiliary contact switches. Signup and view all the answers

Which option describes a feature of the arcing process in the UR 6 circuit breaker?

It generates a constant over-voltage during interruption Signup and view all the answers

How is the connection to the traction vehicle earthing system established?

Through an M8 thread for a bolt. Signup and view all the answers

For what application is the UR 6 circuit breaker particularly suitable?

Rolling stock on DC lines Signup and view all the answers

What happens to the moving contact knife during the switching process?

It separates from one contact spring and engages with another. Signup and view all the answers

What is the function of the arc chute in the UR 6 circuit breaker?

To extinguish the arc Signup and view all the answers

Which component ensures that the circuit breaker can operate under excess current conditions?

Over-current release Signup and view all the answers

Which component is NOT mentioned as part of the switch's design?

A mechanical lever. Signup and view all the answers

What is the role of the contact springs mounted on the base plate?

To facilitate the connection and disconnection of the moving contact knife. Signup and view all the answers

How does the pneumatic cylinder affect the movement of the switch's components?

It pushes the moving contact knife into its positions. Signup and view all the answers

What power source supplies contact positions based on the movement of the piston rod?

The pantograph. Signup and view all the answers

What is the maximum rated voltage for the AC Vacuum Circuit Breaker (VCB)?

30 kV Signup and view all the answers

What is the nominal rated voltage AC for the VCBA25.10Tr?

25 kVrms Signup and view all the answers

What is the short-circuit rupturing capacity of the AC VCB?

16 kA Signup and view all the answers

Which of the following rated time constants has the longest duration?

T4 Signup and view all the answers

What is the control voltage specified for the AC VCB?

110 VDC Signup and view all the answers

What is the closing time for the AC Vacuum Circuit Breaker?

< 100 ms Signup and view all the answers

Which direct over-current release value is NOT mentioned in the data?

0.4 - 1.0 kA Signup and view all the answers

What is the making current for the AC VCB?

40 kArms Signup and view all the answers

What is the input air supply pressure range for the AC VCB?

4.5 to 10 kg/cm² Signup and view all the answers

What is the purpose of the single-knife switch in the AC-DC changeover switch?

To connect power supply from pantograph to other circuits. Signup and view all the answers

What is the lightning impulse withstand voltage for the AC Vacuum Circuit Breaker (VCB)?

175 kVrms Signup and view all the answers

What is the maximum rated voltage specified for the AC Vacuum Circuit Breaker (VCB)?

30 kV Signup and view all the answers

Which control voltage is specified for the AC Vacuum Circuit Breaker?

110 VDC Signup and view all the answers

Identify the rated current value for the AC Vacuum Circuit Breaker.

1000 Arms Signup and view all the answers

What is the short circuit rupturing capacity of the AC Vacuum Circuit Breaker?

16 kArms Signup and view all the answers

How is the rated operating sequence for the AC Vacuum Circuit Breaker described?

-- CO-3 min-CO Signup and view all the answers

What is the maximum arc voltage stated for the direct over-current release?

1.5 - 2.1 Ue Signup and view all the answers

What is the rated time constant T3 duration listed as?

30 kA/40 ms Signup and view all the answers

What is a key feature of the UR 6 circuit-breaker in relation to arc management?

It generates a constant over-voltage throughout the interruption process. Signup and view all the answers

Which of the following components is critical for detecting excess current in the UR 6 circuit-breaker?

Over-current release Signup and view all the answers

What characteristic of the UR 6 circuit-breaker improves its performance in detecting short circuits?

Short response time Signup and view all the answers

What is the primary material used for the fixed insulating frame of the UR 6 circuit-breaker?

Glass-fibre reinforced insulating material Signup and view all the answers

For which specific application is the UR 6 circuit-breaker particularly designed?

DC lines in rolling stock Signup and view all the answers

What is the purpose of the arc chute in the UR 6 circuit-breaker?

To help extinguish the arc during operation Signup and view all the answers

Which sub-assembly of the UR 6 circuit-breaker is responsible for initiating the opening of the main contact?

Closing device and fork Signup and view all the answers

What is the operational current rating of the UR 6 circuit-breaker?

1000 A Signup and view all the answers

What feature distinguishes the circuit-breaker’s response mechanism?

Trip free mechanism Signup and view all the answers

What rated insulation voltage does the UR 6 circuit-breaker possess?

2000 V Signup and view all the answers

What is the primary mechanism that transfers motion to the moving contact knife in the switch?

A pneumatic cylinder Signup and view all the answers

What role does the split on the shaft serve in the design of the switch?

To control auxiliary contact switches Signup and view all the answers

How does the switch change its power supply source?

By switching the position of the moving contact knife Signup and view all the answers

What is utilized to connect the switch to the traction vehicle earthing system?

An M8 thread Signup and view all the answers

Which component directly affects the positioning of the pneumatic cylinder's piston rod?

The moving contact knife Signup and view all the answers

What feature allows for control of the pneumatic cylinder within the switch?

A pneumatic electromagnetic valve Signup and view all the answers

What primary action does the moving contact knife perform during operation?

It engages and disengages contact springs Signup and view all the answers

Which component is mounted on the roof of the traction vehicle?

The switch Signup and view all the answers

What is a consequence of the pneumatic cylinder piston rod being slid out?

Switching to contact C Signup and view all the answers

Which type of connection is used for the power leads in the switch mechanism?

Female panel connector Signup and view all the answers

What is the primary impact of operating the pneumatic drive outside its specified pressure range?

May lead to malfunction Signup and view all the answers

Which aspect of the control circuit voltage range indicates its robustness against voltage fluctuations?

110 V DC with a tolerance of -30% to +25% Signup and view all the answers

How does the turning angle of the breaking knife influence its effectiveness in circuit interruption?

An angle of 60° is optimal for arc extinguishing Signup and view all the answers

What is the significance of the rated insulation voltage being higher than the rated operating voltage?

Prevents breakdown at operational levels Signup and view all the answers

Which of the following statements about the short-time withstand current is correct?

It indicates the maximum fault current handling ability for 1s Signup and view all the answers

How does the rated frequency affect the operation of the electrical equipment described?

Operation at an incorrect frequency can lead to overheating Signup and view all the answers

What role does the dynamic withstand current play in the circuit's performance?

Indicates peak short-circuit performance Signup and view all the answers

What does the change-over time of the pneumatic drive signify for operational efficiency?

Illustrates the responsiveness of the system Signup and view all the answers

Why is the rated insulation voltage crucial for equipment reliability?

It ensures adequate insulation during faulty conditions Signup and view all the answers

In what way does having a mounting position specified as horizontal contribute to operational performance?

Supports optimal functionality of the pneumatic drive Signup and view all the answers

Study Notes

Chapter 6: Other Electrical Equipment

DC High Speed Circuit Breaker UR 6: A cooling air, current-limiting circuit breaker designed for rapid, trip-free opening upon short circuit detection. It maintains a constant over-voltage throughout the interruption process.
Components: Consists of independent sub-assemblies for various functions: fixed insulating frame (glass-fibre reinforced), main circuit (lower connection, moving and fixed contact with horn), over-current release, arc chute, closing device, and auxiliary contacts.
Suitability: Designed for protecting electrical equipment in DC lines due to its quick response time in reacting to overloads and short circuits.
Make: M/s Secheron
Type: U6.32
Rated operational voltage: 1800 V
Rated insulation voltage: 2000 V

AC Vacuum Circuit Breaker (VCB)

Specifications: Various parameters are listed for the VCB, including rated operational current (1000A), conventional free-air thermal current (1000A @ 40°C), rated short-circuit breaking/making capacity, and rated time constants (T1, T2, T3, T4) with associated currents and time frames.
Maximum Arc Voltage: Maximum arc voltage specifications are given in kA and time units (ms and µs).
Technical Data: Important technical details include Make (M/s Autometers alliance Ltd), type (VCBA25.10Tr), maximum rated voltage (30kv), nominal rated voltage AC (1-Ø) (25kV), frequency withstand voltage (dry & wet) (75kVrms), rated current, system frequency, short circuit rupturing capacity, making current, short-time current capacity, opening time, closing time, control voltage, input air supply pressure, and rated operating sequence.

AC-DC Change Over Switch

Function: Connects power supply from pantograph to other traction vehicle circuits; switches between two power supply units
Mechanism: Employs a moving contact knife fixed on an insulator, connected to a shaft. The shaft motion is transferred to the pneumatic cylinder through a lever. It also contains auxiliary contact switches.
Switching: The switch is designed to connect the power supply from the pantograph to the other circuits.
Technical Data The switch is described by its make, type, main circuit, nominal voltage (UN), rated insulation voltage (UNm), rated operating voltage (Ue), and frequency (f).
Make: M/s Secheron
Type: RS 25.10

Surge Arrester

Purpose: Protects high-voltage and medium-voltage device insulation from overvoltages caused by lighting or switching operations
Mechanism: Utilizing metal oxide (MO) resistors connected in series to convert the energy surge to heat, then the heat is dispersed into surrounding air. The device changes from non-conductive to highly conductive under high voltage.
Specifications: Includes short-time withstand current, minimum conducting current, breaking knife angle of turning, mounting position, and weight.
Operating Parameters: The device is characterized by its voltage ratings, tolerance for auxiliary voltage (range, tolerance values), dielectric test voltage, etc.

Dynamic Braking Resistor

Construction: Made of serially connected non-linear metal oxide (MO) resistors.
Function: Converts surge energy to heat for dissipation
Technical Specifications: Detailed parameters listed include make, type, nominal resistance, maximum and minimum resistance values, inductance at 1KHz, load case values (kW, time), continuous load amperage, creepage distance, insulation distance, energy absorption capacity, resistance material, and operating conditions.
Make: Heine Gmbh
Type: BWD73
Operating Conditions: Resistor operation is dependent on temperature, and is designed to safely handle surges.

Earthing Disconnector and Switch

Purpose: Earths circuits on both sides of a high-speed air switch in a traction vehicle for staff safety during maintenance and repair.
Mechanism: Control lever for shifting the breaking knife, mechanically blocked for initial adjustment, allowing a 60° counter-clockwise turn after unsticking the control lever.
Operation: Includes flexible connections for grounding when in the ground position.

Battery and Battery Charger

Power Supply: An onboard 110V DC power supply system. The battery is under the DTC and NDTC.
Battery Charger: A 110 V DC charger located in the ACU. It charges the batteries only in the same basic unit.
Operation Requirements Before the unit's battery can be switched on via the electronics cabinet in the driver's cab, the battery main switches on the shunting cab need to be switched on. Thus, complete isolation of the battery from the onboard system by the main switch.

Miniature Circuit Breakers (MCBs)

Function: Miniature circuit breakers (MCBs) are an essential part of electrical systems. They protect circuits from overloads and short circuits.

Other Equipment

Signal Bells, Solenoid Valves, Current Transformers, Potential Transformers, and Voltage Sensing Devices are listed as other components in the electrical system. There are various types of governors. Multiple types of governors are associated with different operations.
Voltage Sensing Device: Make: Birkholz, Type: HK1.1A, Direct Voltage: 1000 V - 4000V, Alternating Voltage: 25 kV 50 Hz (17 000V – 30 000V).
Potential Transformers: Technical specifications, including the make, type, direct voltage, and alternating voltage are mentioned.

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Description

Explore the key concepts of Chapter 6 on electrical equipment, including the DC High Speed Circuit Breaker and AC Vacuum Circuit Breaker specifications. Understand the components and suitability of these circuit breakers designed to protect electrical systems in DC and AC lines.