On-Load Tap Changer Type H Overview

Questions and Answers

What is the purpose of the document provided by Maschinenfabrik Reinhausen?

To provide technical data on the on-load tap changer type H (correct)

To explain manufacturing processes

To outline company history

To advertise their products

What type of equipment is discussed in the document?

Circuit breaker

Voltage regulator

On-load tap changer (correct)

Transformer

What can be inferred about the communication methods used by Maschinenfabrik Reinhausen?

They primarily use postal services

They rely solely on email for communication

They do not provide contact information

They offer multiple communication channels including phone and fax (correct)

Which section of the document likely contains specific features and capabilities of the on-load tap changer?

Technical Data Signup and view all the answers

What type of information would you expect to find in the 'Accessorial Equipment' section?

List of optional accessories or attachments Signup and view all the answers

Which of the following best describes the format of the document?

A technical manual Signup and view all the answers

Which page likely includes unique designs tailored to specific customer needs?

Page 13 Signup and view all the answers

What is the likely primary audience for this document?

Engineers and technical professionals Signup and view all the answers

What defines the peak value of the highest amplitude of current?

The first amplitude of current measured Signup and view all the answers

What is the time period associated with the r.m.s. value as noted?

3 seconds Signup and view all the answers

What is mandatory if the operating voltage exceeds 92 kV?

A stationary oil filter unit with combined filter insert must be used Signup and view all the answers

Which component is mentioned as a necessity in relation to the tap changer?

Stationary oil filter unit Signup and view all the answers

In what context is the r.m.s. value mentioned?

Specific time duration of 3 seconds Signup and view all the answers

What does the note imply about the operating voltage and its impact on equipment?

There are specific requirements for filter systems at high voltages Signup and view all the answers

What is the oil displacement volume over selector for the tap changer type H III 400 D - 1 2 3?

295 dm³ Signup and view all the answers

For which tap changer type is the test pressure stated as 0.6 bar?

H II 400 D Signup and view all the answers

What is the weight of the oil filling quantity V g and min. without change-over selector for the H III 400 D - 1 4 5 type?

290 kg Signup and view all the answers

What is the minimum oil filling quantity V a with change-over selector for the tap changer type H II 400Y?

26 dm³ Signup and view all the answers

What is a key condition for using a stationary oil filter unit with combined filter insert?

If the operating voltage is greater than 92 kV Signup and view all the answers

What is the oil displacement volume with change-over selector for the tap changer type H III 400 D - 1 2 3?

415 dm³ Signup and view all the answers

What is the maximum pressure that the compartment can handle in terms of continuous service pressure difference?

0.3 bar Signup and view all the answers

Which tap changer type has the highest approximate weight?

H III 400 D - 1 4 5 Signup and view all the answers

What primarily determines the insulation of the tap changer?

Rated withstand voltages Signup and view all the answers

Which factor influences the dielectric strength of the internal tap changer insulation?

Highest voltage for equipment Signup and view all the answers

During which test is the stress on the internal tap changer insulation particularly significant?

Lightning impulse test Signup and view all the answers

What is the rated lightning impulse withstand voltage for a tap changer rated at 145 kV?

650 kV Signup and view all the answers

What must be ensured regarding the voltage stress of the transformer winding?

It must not exceed the rated withstand voltages. Signup and view all the answers

What is the rated power-frequency withstand voltage for a tap changer rated at 76 kV?

140 kV Signup and view all the answers

Which of the following describes the insulation to ground?

It is dimensioned based on rated withstand voltages. Signup and view all the answers

At what temperature is the rated withstand voltage applicable for insulation materials in oil?

20°C Signup and view all the answers

What is the minimum number of steps indicated for one of the tap changer configurations?

8 steps Signup and view all the answers

Which of the following statements is true regarding the connection diagram for tap changers?

Each tap changer has a unique binding connection diagram. Signup and view all the answers

What is the significance of the labeling in the tap changer configuration?

Designates operational positions and tap changer terminals. Signup and view all the answers

Which voltage levels are mentioned for the described tap changers?

40 kV and 76 kV Signup and view all the answers

What can be inferred from the use of coarse tap windings in the configurations?

Similar configurations could use coarse tap windings. Signup and view all the answers

How many steps can variables in the tap changer configuration accommodate?

4 to 6 steps Signup and view all the answers

What does the term 'binding' imply in the context of connection diagrams for tap changers?

It indicates a mandatory connection guideline. Signup and view all the answers

What is a crucial requirement for the connection of a tap changer to a transformer?

A connection diagram must be provided. Signup and view all the answers

The connection diagram provided for each tap changer is non-binding for the connection to the transformer.

False Signup and view all the answers

The tap changer type H III 400 D - 123 is associated with a voltage of 76 kV.

True Signup and view all the answers

Similar basic connection diagrams can be realized for configurations using a fine tap winding.

False Signup and view all the answers

The maximum pressure noted for the compartments relates to the continuous service pressure difference.

True Signup and view all the answers

The inscription on each tap changer terminal is optional for proper function.

False Signup and view all the answers

The tap change dimensions do not comply with any standard designations.

False Signup and view all the answers

For the tap changer configurations, at least 10 steps are always available.

False Signup and view all the answers

The tap changer configuration includes a requirement for insulation strength consideration.

True Signup and view all the answers

The maximum voltage listed for the tap changer type 14273 G is 1760V.

False Signup and view all the answers

The tap changer type 14140 has an operating voltage of 1380V.

True Signup and view all the answers

Tap changer type 12233 W operates at a voltage of 1800V.

False Signup and view all the answers

The tap changer type 14131 W is rated for an operating voltage of 1500V.

False Signup and view all the answers

Tap changer type 12231 G shows a maximum voltage of 1640V.

True Signup and view all the answers

The 14131 W tap changer has a higher voltage rating than the 14271 W tap changer.

False Signup and view all the answers

Tap changer type 12120 shows a maximum voltage rating of 1600V.

False Signup and view all the answers

The tap changer type 14273 W has a maximum operating voltage of 1500V.

True Signup and view all the answers

The peak value of the highest amplitude of current is referred to as the first amplitude.

True Signup and view all the answers

The rated switching capacity for H I l 400 Y is 320 kVA.

True Signup and view all the answers

The breaking capacity must equal at least three times the rated switching capacity.

False Signup and view all the answers

A stationary oil filter unit is required if the operating voltage exceeds 100 kV between phases.

False Signup and view all the answers

The maximum rated step voltage U; for the tap changer H I I 400D is 2000 V.

True Signup and view all the answers

H III 400 D - 145 has 10 contacts.

False Signup and view all the answers

The estimated mean contact life of selector switch arcing contacts is independent of the relative load.

False Signup and view all the answers

The r.m.s. value is determined over a period of 5 seconds.

False Signup and view all the answers

The tap changer H I l 400D - 123 has a rated through-current of 400 A.

False Signup and view all the answers

Contact life can be accurately predicted without considering the prevailing operating conditions.

False Signup and view all the answers

The maximum voltage specified for the tap changer type H III 400 D - 1 2 3 is 92 kV.

False Signup and view all the answers

If the oil filter unit has a combined filter insert, it implies a higher filtration efficiency.

True Signup and view all the answers

The maximum switching capacity refers solely to the through-current at the relevant step voltage.

False Signup and view all the answers

The rated switching capacity for the H III 400 D - 1 2 3 is 600 kVA.

True Signup and view all the answers

The estimated mean contact life can exceed 500,000 operations under average load conditions.

True Signup and view all the answers

The obligatory use of a stationary oil filter is dependent on the design of the tap changer.

False Signup and view all the answers

The tap changer H II 400 Y has a rated step voltage (U;) of 1500 V.

False Signup and view all the answers

According to the data, tap changers have different maximum rated step voltages based on their configurations.

True Signup and view all the answers

As per the IEC standards, the breaking capacity of a device is less important than its rated switching capacity.

False Signup and view all the answers

The H III 400 Y model features a higher rated switching capacity than the H I l 400D model.

False Signup and view all the answers

Study Notes

Technical Overview

Document pertains to the On-Load Tap Changer Type H manufactured by Maschinenfabrik Reinhausen.
Contact specifications include variants such as 12 and 14 contacts, with weight ranging from approximately 190 kg to 265 kg.

Operating Conditions

Oil compartments are pressure-proof up to 0.3 bar with a test pressure of 0.6 bar and vacuum-proof for drying processes.
Tap changers must use a stationary oil filter if operating voltage between phases exceeds 92 kV.

Design Characteristics

Tap changer types specified include H I I 400Y, H I I 400 D, H III 400 D - 1 2 3, and H III 400 D - 1 4 5.
Oil displacement volume varies with options of either a selector or without, ranging from 230 dm³ to 405 dm³.

Insulation Standards

Insulation resilience is determined by rated withstand voltages applicable to both ground and internal insulation.
Key voltages include rated lightning impulse withstand voltages from 200 kV to 650 kV and rated power-frequency withstand voltages from 70 kV to 275 kV.

Configuration and Connection

A mandatory connection diagram is provided for each tap changer for proper installation with transformers.
Specific voltage stress considerations are crucial for selecting appropriate tap changers to ensure compliance with prescribed voltage limits.

Additional Notes

Acknowledgment of specific operational conditions is necessary during installation, particularly during stress tests on transformer windings.
Insulation measurements were based on new, well-dried insulating materials immersed in treated transformer oil at a nominal temperature of around 20°C.

Tap Changer Specifications

Various tap changers are listed: H I 400 Y, H II 400 D (123), H III 400 D (145), and their rated currents and step voltages vary.
Each type features a specific number of contacts: H I 400 Y has 17, H II 400 D has 10, while H III models have 12 and 14 contacts respectively.
Rated through-currents (I) are 400A or 350A, while rated step voltages (Ui) range from 800V to 2000V.

Rated Capacities

Switching capacities (PgN) for the tap changers vary, with values such as 320 kVA for H I 400 Y and 600 kVA for H III 400 D (145).
The maximum rated switching capacity must be at least double the rated switching capacity to ensure safe operation under load conditions.

Maximum Step Voltages

Maximum permissible step voltages for OLTCs (on-load tap changers) are defined, with values such as 1640V, 1800V, and 1380V across different designs.
These values are critical for maintaining operational safety and performance.

Contact Life and Maintenance

Estimated mean contact life of selector switch arcing contacts is provided, influenced by operational load. Varies with load conditions and requires adherence to inspection instructions.
The life indicators depend on the number of operations and actual through-current compared to the maximum rated current.

Designation and Diagrams

Connection diagrams for each tap changer are mandatory, ensuring correct installations for transformers.
Basic connection diagrams for different tap changers can accommodate a range of step adjustments, identified by specific designations.

Additional Requirements

When operating voltages exceed 92 kV, a stationary oil filter unit with a combined filter insert is required to manage and mitigate potential risks.

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Description

This quiz covers the technical specifications and design characteristics of the On-Load Tap Changer Type H by Maschinenfabrik Reinhausen. It includes details on operating conditions, insulation standards, and variants of contact specifications.