Construction of substation 220 kV Lafarge. Volume 2. Relay protection and automation, страница 3

Creating self-contained supply protections based on direct current makes it possible to limit number of trips during the short-circuit in case when bank of accumulators is also damaged.

2.3.4. Each protection kit of the feeder line influence separate opening electromagnet (if it is possible, both electromagnets.

The presence of two opening electromagnets reduces the total number of breaker failures, fault clearances with breaker failure protection time delay and disconnection of undamaged elements.

System operational diagrams of the opening electromagnets should be powered by the direct current boxes, which have power supply from different banks of accumulators. Trip circuits of each protection kit must be made with separate screened cables, which are laid, if it is possible, in different cable trays.

2.4. There must be possibility of the integration all microprocessor-based relay devices (any manufacturer) with process control system of the substation.

There are some requirements and recommendations from ОАО «UES FGC» that must be considered: instruction № 165р from 29/03/2010 («Recommendations for usage of the combined technical solutions matrix of different device (RPA, PCS,AMR) manufacturers») and instruction №366р from 24/06/2010 г. («On approval of a standard list of signals from the RPA, AMR and engineering systems of the substation control system»).

2.5. Each RPA device must have customizable LED alarm system (with or without storage).

In addition, there should be a local LED alarm system (at protection cubicles).

The terminals must have an individual transmission of the signals into the PCS.

2.6. If you have a cubicle with different terminals and devices for various functional purposes, their service area must be independent.

2.7. IEDs can be influenced by noise. According to this, we must be ensured that all requirements of electromagnetic compatibility (EMC) and interference immunity are satisfied at the substation 220 kV Lafarge. They are: GOST R 51317.6.5 – 2006 (IEC 61000-6-5:2001) «Electromagnetic compatibility. Immunity for Power Station and Substation Environments».

Necessary measures for protection from impulse noise are developed in accordance with the applicable standards: «Guidelines for electromagnetic compatibility of secondary equipment and communication systems of the power grid» (STO 56947007-29.240.043-2010), «Guidelines for the provision of electromagnetic compatibility on the power grid» (STO 56947007-29.240.044-2010), from 21/04/2010.

2.8. The manufacturer shall provide kit of spare parts, consumables and supplies required for the construction, mounting, commissioning, maintenance and repair of relay protection devices.

The volume of spare parts must ensure the fulfillment of the requirements for availability and maintainability of RPA during the warranty period.

To work with the MP relay protection devices at the substation, the manufacturer has to deliver full software and technical documentation in Russian.

For conduct tests and inspections of the MP RPA devices at the substation is recommended to have the necessary test equipment, that must include specialized test instruments (eg, RETOM-61) required for construction, installation, commissioning, maintenance and repair of relay protection. The necessary software package shall be provided as part of the delivery of test devices.

3. General technical requirements for microprocessor-based relay protection devices

3.1. Alternating current circuits of the terminals

Nominal current                                                                  Inom = 1 А and 5 А (on LV side)

Rated thermal current                                                         2×Inom (long)

One second resistance current                                            40×Inom

Operating current range                                                                                                      (0,05I30)×Inom

Consumption per phase at Iном                                           below 0,5 V∙А (0,3 V∙А)

3.2. Alternating voltage circuits of the terminals