Electricity consumers, power supply organizations and bodies of Rostekhnadzor. The legal basis of the relationship. Administrative regulations of Roszheldor on the provision of state services for the implementation of the number accounting of railway subways

SO 153-34.20.505-2003

The instruction determines the order and sequence of switching operations in electrical installations with voltages up to 1000 V and above. The instruction is drawn up in accordance with federal law, rules technical exploitation power stations and networks, labor protection rules. On the basis of this Instruction at power plants, in electrical networks, local instructions for the production of switches should be developed, taking into account the features of normal and repair schemes of electrical connections of electrical installations, the design and composition of switchgear equipment, features of relay protection and automation devices, and the procedure for operational maintenance of these facilities.

The instruction was approved and put into effect by Order of the Ministry of Energy of Russia dated June 30, 2003 N 266.

Document format: .doc(MS Word)

1. GENERAL PART

2. ORGANIZATION AND PROCEDURE OF SWITCHING

2.1. Switching order

2.2. Switching forms

2.3. General provisions on switching

2.4. Switching in relay protection and automation circuits

2.5. Switching during elimination of technological violations

2.6. Switching on commissioning of new equipment and testing

3. PERFORMING CHANGES

3.1. Carrying out operations with circuit breakers, disconnectors, isolators and load break switches

3.2. Removing the operating current from the drives of switching devices

3.3. Checking the positions of the switching devices

3.4. Hot-lock actions

3.5. Sequence of operations with switching devices of line connections, transformers, synchronous compensators and generators

3.6. The sequence of operations when turning on and off power lines

4. SWITCHING WHEN TRANSFERING CONNECTIONS FROM ONE BUS SYSTEM TO ANOTHER

5. SWITCHING WHEN HAVING THE EQUIPMENT FOR REPAIR AND WHEN STARTING IT INTO OPERATION AFTER REPAIR

6. METHODS OF REMOVAL INTO REPAIR AND COMMISSIONING AFTER REPAIR OF BREAKERS

7. SWITCHING IN POWER DISTRIBUTION NETWORKS

7.1. Features of performing switching

7.2. General instructions for switching operations

7.3. Sequence of operations during execution certain types switchings

Annex 1... ACCOUNTING, SUPPLY AND REMOVAL OF EARTHING

Appendix 2. MAINTENANCE OF OPERATING SCHEME AND SCHEME-LAYOUT OF ELECTRICAL CONNECTIONS OF POWER PLANTS AND SUBSTATIONS

Appendix 3. SWITCHING IN POWER DISTRIBUTION NETWORKS 0.4 KV SUPPLYING ELECTRICAL INSTALLATIONS OF CONSUMERS WITH BACKUP POWER PLANTS

I did not find a table of contents in the instruction itself, so I compiled it myself.

6.2.4. Operational switching in electrical installations

One of the most difficult and responsible tasks, requiring a thorough knowledge of the power supply scheme of an electrical installation, is the production of operational switching. Switchings are carried out in connection with the preparation of workplaces for performing various kinds of work in the electrical installation (installation, commissioning, repair, etc.), to ensure reliable, economical and safe power supply to production and for a number of other reasons related to operational dispatch control in the power system.

When making operational switches, there should be a clear delineation of the responsibilities of all links of the operational dispatching personnel. Switchings are carried out by order or with the knowledge of higher operational personnel, in operational management or who is in charge of this electrical equipment. In accordance with the established by the consumer electrical energy in order, it can be an oral or telephone order with an entry in the operational log.

By Order No. 266 of June 30, 2003, the Ministry of Energy of Russia approved the Instructions for Switching in Electrical Installations, which determines the order and sequence of switching in electrical installations with voltages up to and above 1000 V.

The instruction is drawn up in accordance with federal legislation, PTE of power plants and networks, labor protection rules.

On the basis of the specified instructions, local instructions for switching operations should be developed at power plants, in electrical networks and at other facilities, taking into account the features of normal and repair circuits of electrical connections of electrical installations, the design and composition of the switchgear equipment, the features of the relay protection and automation equipment, and the procedure for operational maintenance of these facilities. The instructions should reflect the features and order of switching during the operational maintenance of electrical equipment.

The content of the switching order and the procedure for its implementation are determined by the issuing superior operational personnel, taking into account the complexity of the task, the necessary coordination of the operations of the operating personnel and the consistency of changes in the electrical installation diagrams. The order specifies the purpose of switching and the sequence of operations in the electrical installation diagram and relay protection and automation circuits with the required degree of detail, determined by the superior operational and dispatching personnel.

At power plants and substations with constant duty of operating personnel, the switch executor is simultaneously given no more than one task for carrying out operational switches, containing operations of one purpose.

When eliminating damage in power grids with a voltage of 10 kV and below, it is allowed to perform the next tasks without a preliminary notification to the dispatcher about the performance of the previous tasks.

The dispatcher's order to switch is considered executed if the recipient of the order informed the dispatcher about its implementation.

Operational switching should be performed by an employee from among the operational personnel who directly maintains electrical installations. Complex switchings, as well as all switchings (except for single ones) on electrical installations that are not equipped with interlocking devices or have faulty interlocking devices, must be carried out according to programs or switching forms.

To complex switches include switching that requires a strict sequence of operations with switching devices, earthing disconnectors and relay protection and automation devices. Lists of complex switchings, approved by the technical manager of the enterprise (organization), technical managers of the corresponding AO-energos and power facilities, should be stored at dispatch centers, central (main) control panels of power plants and substations.

Switching form (normal) is an operational document, which provides a strict sequence of operations with switching devices, grounding disconnectors (knives), operating current circuits, relay protection and automation devices, operations for checking the absence of voltage, applying and removing portable grounding, hanging and removing posters, as well as necessary (according to conditions of personnel safety and equipment safety) verification operations.

Typical switching form is an operational document that indicates a strict sequence of operations when performing repetitive complex switchings in electrical installations for specific wiring diagrams and states of relay protection and automation devices.

During the production of complex switchings, it is not allowed to replace the forms or switch programs with any other documents.

The most important personnel check actions are indicated in the switching forms:

checking the absence of voltage before applying grounding (turning on the grounding knives) on live parts;

on-site check of the switched-on position of the bus-connection switch before starting the operations to transfer the connections from one bus system to another;

on-site check of the disconnected position of the circuit breaker, if the next operation is with disconnectors;

on-site check or by means of signaling devices of the position of each switching device of the primary circuit after the operation with this device;

check at the end of the switching of the correspondence of the switching devices in the relay protection and automation circuits to the regime cards.

The instruction strictly regulates the rules and procedure for the application, registration, storage and reporting when using switch forms. Each operation or action in the switching form is recorded under a sequential number (Appendix 5). The switching forms themselves must be numbered. Used switching forms are stored in the prescribed manner for at least 10 days.

As well as general provisions on switching, the instructions contain the requirements and procedure for the production of operational switching in relay protection and automation circuits, in the elimination of technological violations, when new equipment is put into operation and testing is carried out. The sequence of operations with switches, disconnectors, isolators and load breakers, as well as with switching devices of line connections, transformers, synchronous compensators and generators is given. The order of switching is considered when transferring connections from one bus system to another, when taking equipment for repair and when putting it into operation after repair, etc.

When describing switchings in distribution networks in addition to the peculiarities of the switching operations and general instructions for their implementation, the sequence of operations is given when performing certain specific types of switching. It is necessary to know and strictly follow the sequence of performing these operations.

In Appendix 6, as an example, the sequence of basic operations is given when the supply cable line is taken out for repair, and in Appendix 7, the sequence of basic operations when it is put into operation after repair.

Electricity consumers must have lists of complex switchings, approved by the technical head of the organization, which must be stored at dispatch centers, central (main) control panels of power plants and substations.

Complex switching should be performed, as a rule, by two workers, of whom one is the supervisor.

Switchings in electrical installations of different control levels and different objects are carried out according to switching programs (typical programs).

Switching program (typical program) is an operational document that indicates a strict sequence of operations during switching in electrical installations of different control levels or different power facilities.

The switching program is approved by the head of the dispatch control, in the operational subordination of which all the equipment to be switched is located.

If there is only one worker from the operating personnel in the shift, the supervisor can be an employee from the administrative and technical personnel who knows the scheme of this electrical installation, the rules for making switches and is allowed to perform them.

In emergency cases (accident, natural disaster), as well as during the elimination of accidents, it is allowed, in accordance with local instructions, to perform switching without the order or without the knowledge of the superior operational personnel, followed by his notification and entry in the operational log.

Switching in an electrical installation is allowed to be performed by operating personnel who know its circuit, the location of equipment and relay protection devices, trained in the rules for performing operations with switching devices and clearly representing the switching sequence, having passed the knowledge test of the PTE, safety rules and instructions. The admission to operational work is allowed after duplication at the workplace.

The list of workers allowed to carry out the switchings (indicating on which electrical installations), as well as the list of persons of the administrative and technical personnel who control the implementation of the switchings, are approved by the head of the enterprise (organization).

The list of employees who have the right to conduct operational negotiations is approved by the person in charge of the electrical facilities and transferred to the energy supplying organization and sub-subscribers.

In accordance with PTEEP, in the programs and forms of switching, which are operational documents, the procedure and sequence of operations must be established when carrying out switching operations in the circuits of electrical connections of electrical installations and relay protection and automation circuits.

Switching programs (standard programs) should be applied by the managers of operating personnel when making switches in electrical installations of different control levels and different power facilities. The workers directly performing the switching are allowed to use the switching programs of the corresponding dispatcher, supplemented with switching forms.

In electrical installations with voltages above 1000 V, switching is carried out:

without switching forms - with simple switching and in the presence of operating interlocks, excluding incorrect operations with disconnectors and earthing knives during all switching operations;

according to the switching form - in the absence of interlocking devices or their malfunction, as well as in case of complex switching.

Without forms, but with a subsequent entry in the operational log, switching is carried out during the elimination of accidents.

In electrical installations with voltages up to 1000 V, switching is carried out without drawing up forms, but with an entry in the operational log.

When switching in electrical installations, PTEEP requires the following order to be observed:

an employee who has received a switching task is obliged to repeat it, record it in the operational log and establish the order of forthcoming operations according to the operational scheme or layout scheme, draw up, if required, a switching form. Operations' negotiations should be as short and clear as possible;

if the switchings are performed by two workers, then the one who received the order is obliged to explain, according to the operational diagram of the connections, to the second worker participating in the switchings, the order and sequence of forthcoming operations;

if there are doubts about the correctness of the switching, they should be stopped and the required sequence should be checked according to the operational connection diagram;

after completing the switching task, a record should be made in the operational log.

Operational personnel directly performing switching operations are prohibited from unauthorized disabling of the interlocks.

In accordance with the requirements of the PUE, all switchgears must be equipped with an operational blocking of incorrect actions during switching in electrical installations, designed to prevent incorrect actions with disconnectors, grounding knives, separators and short-circuits.

Hot-lock should exclude:

voltage supply by the disconnector to the section of the electrical circuit grounded by the switched on earthing switch (grounding knife), as well as to the section of the electrical circuit separated from the switched on earthing switches only by the switch;

turning on the earthing switch in the circuit section not separated by the disconnector from other sections, which can be both energized and de-energized;

disconnection and switching on by the load current disconnector.

Operational blocking should provide in the scheme with serial connection a disconnector with a separator, the unloaded transformer is switched on by a disconnector, and disconnected by a separator.

Unlocking is allowed only after checking the disconnected position of the switch on site and finding out the reason for the failure of the interlocking with the permission and under the guidance of employees authorized to do so by a written order of the consumer responsible for the electrical equipment.

When switching in electrical installations, operations on the imposition and removal of portable groundings almost always take place. Operating personnel performing operations with portable grounding must comply with the following provisions of the instructions.

Portable grounding should be numbered through for the entire electrical installation and stored in certain places designated for this purpose, the numbering of which should correspond to the number available on the portable grounding.

To save time on recording when handing over duty, it is recommended to use a special stamp for accounting for portable groundings, affixed in the operational log, for example, as shown in table. 6.2.

Table 6.2

Stamp of accounting for portable groundings and a record of their locations

Earthing No. 1, 2 - under repair.

Grounding No. 40 is installed in cell 15 on KL5.

When the equipment is taken out for repair and its grounding, the stationary grounding knives are switched on first, and then (if necessary) portable groundings are applied. When the equipment is put into operation after repair, all portable groundings are first removed and placed in storage areas, and then the stationary grounding knives are turned off.

The form of switching is completed by the person on duty who has received an order to carry out them. The form is signed by both workers who carried out the switching. The supervisor when performing switches is the senior in position. The responsibility for correct switching in all cases rests with both workers performing the operations.

Disconnection and switching on under voltage and in the operation of a connection that has a switch in its circuit must be carried out using a switch.

It is allowed to turn off and on by separators, disconnectors, detachable contacts of the switchgear (KRUN) connections:

neutrals of power transformers with voltage of 110โ€“220 kV;

grounding arc suppression reactors with a voltage of 6-35 kV in the absence of an earth fault in the network;

magnetizing current of power transformers with a voltage of 6-220 kV;

charging current and earth fault current of overhead and cable power lines;

charging current of bus systems, as well as charging current of connections in compliance with the requirements of regulatory and technical documents of the power supply organization.

In ring networks with a voltage of 6-10 kV, disconnectors are allowed to disconnect equalizing currents up to 70 A and close the network into a ring when the voltage difference across the open contacts of the disconnectors is not more than 5% of the rated voltage.

It is allowed to turn off and turn on the load current up to 15 A by outdoor three-pole disconnectors at a voltage of 10 kV and below.

The disconnectors allow remote disconnection of a faulty 220 kV circuit breaker bridged with one circuit breaker or a chain of several circuit breakers of other connections of the bus system, if disconnection of the circuit breaker can lead to its destruction and de-energize the substation.

The permissible values โ€‹โ€‹of the currents to be turned off and turned on by the disconnectors must be determined by the regulatory and technical documents of the power supply organization.

The procedure and conditions for performing operations for various electrical installations should be regulated by local instructions.

Switches are mainly used as switching devices for the production of operational switching (manual or automatic switching on and off). Switches with arc suppression devices are designed to turn on or off sections in the circuit through which the load current, no-load current or short-circuit current (SC) flows.

Disconnectors are also designed for manual or automatic switching on or off, but de-energized sections of the circuit; they are allowed to perform the following operations:

switching on and off the charging current (transient and alternating steady-state current through capacities of all types) of busbars and equipment of all voltage classes (except for the current of power capacitor banks);

switching on and off voltage transformers, neutrals of power transformers and arc suppression reactors with a rated voltage of up to 35 kV inclusive in the absence of a phase-to-earth fault or resonance in the network;

switching on and off of electromagnetic type voltage transformers with a rated voltage of 110 kV and above;

bridging and bridging of the switched on switches (from the drives of which the operating current is removed) together with the adjacent busbar.

When switching in electrical installations, it is necessary to follow a certain sequence, avoiding the slightest errors that can lead to emergency situations in electrical installations and electrical injuries.

This can happen, for example, during operational switching in networks with a voltage of 6-10 kV due to non-observance of a certain sequence of operations with disconnectors and switches. The consequences of erroneous switching on or off of the current by disconnectors depend on which disconnectors (busbar or line disconnectors) are operated. The first to open, and the last to open, are those disconnectors, the incorrect operation of which can lead to more serious consequences.

For example, the sequence of typical operations with switching devices when turning on and off connections of overhead lines and cable lines should be as follows.

Turning on:

the open position of the switch is checked; the busbar disconnector switches on;

the line disconnector turns on;

the switch turns on.

Disconnection:

the switch turns off;

the line disconnector is turned off; the busbar disconnector switches off.

The sequence of operations in switchgear with withdrawable elements when the connections of overhead lines and cable lines are switched on should be as follows.

Turning on:

it is checked whether the switch is open;

the circuit breaker trolley moves from the control to the working position;

the switch turns on. Disconnection:

the switch turns off; it is checked whether the switch is open;

the trolley with the switch is moved to the inspection or repair position.

The disconnection of sectional disconnectors that are not interlocked with sectional switches (or in the absence of the latter) is carried out after the load is removed from the disconnected bus system and the disconnectors provide a visible gap not only from the side of the supply connections, but also from the side of the outgoing feeders.

Despite the fact that the procedure for performing operational switching in electrical installations has remained unchanged for many years and has been worked out in detail, the readiness and safety of its implementation is largely determined by the level of organization of such work, the completeness and quality of the above regulatory operational dispatch documentation, the degree of responsibility and professionalism of the operational personnel of electrical installations of consumers and power supply organizations.

 

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