Electrical networks, equipment, documentation, instructions. Electrical networks, equipment, documentation, instructions Switching and durability of low-voltage circuit breakers

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Switching and durability of low-voltage circuit breakers

Factors of durability of operation are considered low voltage circuit breakers(how long the contacts will withstand) due to shutdown operations.

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Electrical Maintenance Management 4

Based on the evaluation of the various factors discussed earlier, and the evaluation of other factors, if any, a decision is made to implement condition monitoring based maintenance. How exactly this program can be practically implemented is discussed below.

The impact of any equipment maintenance initiatives, including condition monitoring, must be predictable and measurable and related to the performance and reliability of the production unit. In addition, it should be remembered that monitoring systems, especially fully integrated technologies, are themselves subject to failures and failures and require maintenance.

Electrical Maintenance Management 2

A predictive maintenance management program is a maintenance program established for electrical equipment based on regular monitoring of its actual physical condition, operating parameters, operational efficiency and other indicators. A condition monitoring-based maintenance management program consists of techniques that attempt to “predict” or diagnose problems in electrical equipment based on the analysis of acquired data.

Electrical Maintenance Management 1

Over the past two decades, the concept of equipment maintenance has taken on different dimensions and has changed significantly, perhaps more than any other management discipline. Electrical equipment, which has a rather complex design, requires new methods of maintenance, and a change in views on the organization of maintenance and the responsibilities associated with it.

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2.1 Familiarize yourself with the design of overhead power lines.

2.2 Study the types and designs of insulators, make sketches of pin insulators used on overhead lines -0.38 kV and above.

2.3 Study the types and designs of pins and hooks for overhead lines - 038 kV, make their sketches for overhead lines - 0.38 kV.

2.4 Study the designs, types and purpose of clamps, coupling fittings for hanging garlands on overhead line supports, make sketches of clamps, staples, earrings and connectors.

2.5 Study the rules of operation, maintenance and repair of overhead lines.

3 Security questions

3.1 What is the design of linear fittings for overhead lines - 0.38 kV.

3.2 What is the design of linear fittings for overhead lines above 1 kV.

3.3 What is the design of insulators for overhead lines - 0.38 kV.

3.4 What is the design of insulators for overhead lines above 1 kV.

3.5 How the 0.38 kV overhead line is operated.

3.6 How to operate overhead lines above 1 kV.

3.7 How it is produced Maintenance Overhead line – 0.38 kV.

3.8 How routine repairs of overhead lines above 1 kV are carried out.

Laboratory work No. 3

Operation of high voltage type circuit breaker

MMO 110/1250/20 U1

Purpose of the work: to study the purpose and operating conditions of the MMO 110/1250/20 U1 switch; the process of extinguishing the arc in circuit breakers and the design of the arc extinguishing device; study the maintenance procedure during operation of the MMO 110/1250/20 U1 circuit breaker.

1 Theoretical explanations

1.1 Purpose

A small-volume circuit breaker type MMO 110/1250/20 U1 with one spring-motor drive ZPM 70000 is designed for operational and emergency switching on and off of part of the power distribution network. It can be installed in open switchgears and is designed to operate in temperate climates with the following climatic parameters:

Ambient air temperature is not higher than plus 40°C (with an average daily temperature not higher than plus 35°C) and not lower:

a) minus 40°С (occasionally minus 45°С) for switches filled with ATM -65 transformer oil according to TU 33-1 -225 -69.

b) minus 25С for switches filled with transformer oil in accordance with GOST 982-68.

1.2.2 Relative air humidity - up to 100%.

1.2.3 Altitude above sea level - up to 1000 m.

Normal operation of the switch is not guaranteed:

– in an environment with big amount conductive vapors or dust, which may cause big pollution isolation;

– in an environment containing chemically aggressive gases;

– in close proximity to explosive and fire hazardous objects;

– in places where the switch will be subject to industrial vibrations, shocks, etc.;

– if the instructions in these instructions are not followed.

The full type designation of the MMO 110/1250/20 U4 circuit breaker is deciphered as follows: MMO - symbol series, 110 – rated voltage in kilovolts, 1250 – rated current in amperes, 20 – rated shutdown current in kiloamperes, U – for areas with a temperate climate, 1 – placement category: for outdoor installation.

The designation of the spring drive of the ZPM 70000 circuit breaker is deciphered as follows: ZPM is the symbol of the drive, 70000 is the average potential energy of the switching springs in the wound-up state, kg cm. The technical data of the switch is given in table. 8.

Table 8 – Technical data of switch type MMO 110/1250/20 U1

The insulation of the elements of the control, blocking and signaling circuits of the drive (without an electric motor) can withstand a test voltage of industrial frequency equal to 2 kV for 1 minute. The switch is suitable for operation in icy conditions with an ice crust thickness of up to 20 mm and wind speeds of up to 15 m/s; in the absence of ice and wind speeds up to 40 m/s. The switch is designed for a wire tension (in the horizontal direction in the plane of the pole) equal to 100 kg·s.

The switch has the following reliability and durability indicators:

a) mechanical life of 1000 starts and 1000 shutdowns;

b) switching life - the number of total on and off operations permissible without inspection and repair of the circuit breaker:

– rated breaking current of 3 operations;

– 60 % rated current shutdowns – 20 operations;

c) overhaul period is 3 years.

The contact leads are made of aluminum with coated (silver) contact surfaces.

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