GB/T 7261-2016Basic testing method for relaying protection and security automatic equipment (English PDF)

Foreword

GB/T 7261-2016 was issued on 24 February 2016 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China together with the Standardization Administration of China, and came into force on 2 May 2016. It is classified under ICS 29.120.70 and 29.240.30 and Chinese classification code K 45, and it replaces GB/T 7261-2008, Basic testing method for relaying protection and security automatic equipment.

The standard was drafted in accordance with the rules given in GB/T 1.1-2009.

Compared with GB/T 7261-2008 the main changes are: the reference conditions for testing were revised to follow GB/T 14598.2; contact pressure, contact gap and contact overtravel were deleted from 6.1; the coil inductance parameter was deleted from 6.2; a method for applying the energizing quantity slowly in steps was added; measurement of the static power consumption, maximum power consumption, inrush and start-up time of auxiliary circuits and measurement of the power consumption of binary inputs were added; a time synchronisation performance test was added; a digital interface test based on IEC 61850 was added; the infrared method of measuring temperature rise was deleted; the environmental tests were recast as climatic environmental tests, revised as the referenced standards require, with a recovery process added; power supply voltage dips, short interruptions and ripple were reclassified under electromagnetic compatibility; the order of the electromagnetic compatibility tests was adjusted; the communication protocol test was recast as a communication and protocol test with related content added; Annex E was added.

The standard was proposed by the China Electrical Equipment Industry Association and is under the jurisdiction of the National Technical Committee on Measuring Relays and Protection Equipment of Standardization Administration of China (SAC/TC 154).

Drafting organisations: Xuchang Kaipu Testing Technology Co., Ltd.; Changyuan Shenrui Relay Protection Automation Co., Ltd.; China Electric Power Research Institute; Beijing Sifang Automation Co., Ltd.; Hebei Electric Power Dispatching and Control Centre; Nanjing NARI-Relays Electric Co., Ltd.; Xuchang Kaipu Electrical Research Institute; Xuji Electric Co., Ltd.; Jicheng Electronics Co., Ltd.; Guodian Nanjing Automation Co., Ltd.; Beijing Ziguang Measurement and Control Co., Ltd.; Dongfang Electronics Co., Ltd.; Zhuhai Wanlida Electric Automation Co., Ltd.; State Grid Electric Power Research Institute; Harbin Electric Group Acheng Relay Co., Ltd.; Hebei Beiheng Electric Technology Co., Ltd.; Jiangsu Jinzhi Technology Co., Ltd.; ABB (China) Ltd.; Schneider Electric (China) Co., Ltd.; Shanghai Huajian Electric Power Equipment Co., Ltd.

Principal drafters: Li Quanxi, He Chun, Liu Hongjun, Liu Huihai, Fan Wei, Sun Liqiang, Ling Gang, Li Zhiyong, Yang Huixia, Liang Jingwan, Yuan Wenguang, Yu Huawu, Hu Jiawei, Yu Yue, Zhao Hongqiang, Zhu Zhiwei, Yu Bo, Chen Zhenzhong, Tian Jianjun, Shen Jun, Li Yan, Yang Lipan, Wang Qi, Jiang Guanqian, Hu Xiaojing.

The previous editions of the standard were issued as GB/T 7261-1987, GB/T 7261-2000 and GB/T 7261-2008.

1 Scope

Protection relays and security automatic equipment spend almost their whole life doing nothing. They matter for the few tens of milliseconds after a fault, when a short circuit is pouring tens of kiloamperes into a line and the plant either clears it or burns. That makes them almost impossible to judge from service experience: a device that has never operated is indistinguishable from a device that never will, and the moment when its defect becomes visible is precisely the moment when the consequence is a burnt transformer or a cascade across the grid. The only honest evidence is therefore laboratory evidence, obtained before the device is put into service, and it has to cover far more than whether the element picks up at the right setting. The substation environment attacks the equipment from every side at once: winter cold and summer heat inside an unheated cubicle, condensation, vibration from nearby breakers, earthquake, station battery voltage that sags and ripples, and violent electromagnetic disturbance every time an isolator is switched. This document lays down the common laboratory procedures used in China to prove all of that - the reference conditions, the instruments, the accuracy and timing measurements, the climatic, mechanical, insulation, electromagnetic compatibility, overload, safety and communication tests - so that results from different laboratories mean the same thing.

This standard specifies the basic testing methods for relaying protection and security automatic equipment.

This standard applies to the testing of all-or-nothing relays, measuring relays, protection equipment, security automatic equipment (protection equipment and security automatic equipment being referred to below simply as equipment) and their interface devices used in the secondary circuits of electric power systems.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

The list runs from GB/T 2422 on environmental testing terminology and the GB/T 2423 series of climatic test methods through the electrotechnical vocabularies GB/T 2900.1, GB/T 2900.17, GB/T 2900.49 and GB/T 4365, the enclosure protection standard GB 4208-2008, the radio disturbance standards GB 4824 and GB 9254, the fire hazard test GB/T 5169.16-2008, the mechanical test standards GB/T 11287-2000 and GB/T 14537-1993, the touch current method GB/T 12113-2003, the remote terminal unit standard GB/T 13729-2002, the measuring relay standards GB/T 14598.2-2011, GB/T 14598.26-2015 and GB 14598.27-2008, the magnetic field immunity tests GB/T 17626.9-2011 and GB/T 17626.10-1998, the electromechanical relay standard GB/T 21711.1-2008, the Modbus test specifications GB/T 25919.1-2010 and GB/T 25919.2-2010, the dynamic model test standard GB/T 26864, the power industry standards DL/T 634.56-2010, DL/Z 860.2-2006 and DL/T 860.10, and the international standard IEC 60255-21-3:1993 on seismic tests.

3 Terms and definitions

For the purposes of this document the terms and definitions given in GB/T 2422, GB/T 2900.1, GB/T 2900.17, GB/T 2900.49, GB/T 4365 and DL/Z 860.2 apply, together with the following.

3.1 basic testing method: a general test method used to test a product under specified test conditions; it does not include the specialised tests of a particular class of product or the methods followed for a specific test.

3.2 variation test: a test carried out while one influencing quantity or influencing factor of the product is at a limit of its nominal range and the remaining influencing quantities or factors are at their reference conditions.

3.3 permissible deviation of the testing condition: where the specified parameter of the test condition is M and the actual parameter of the test condition is N, the permissible deviation of the test condition is given by (N minus M) divided by M, expressed as a percentage. Note: the permissible deviation of the test condition may also be expressed as an absolute value; the permissible deviation is the permitted range of variation of a value.

3.4 equipment under test (EUT): the equipment being tested. Unless otherwise specified it shall include all its ancillary devices.

3.5 cold state: the state in which, no energizing quantity being applied, the temperature of every part differs from the ambient temperature by not more than 3 K.

3.6 thermal state (thermally stable state): the state in which, under the action of the specified energizing quantity, the temperature rise of the product has become stable; in this state the temperature difference measured at half-hour intervals does not exceed 1 K.

3.7 single axis sine sweep seismic test: a test in which the equipment under test is subjected in turn along its three orthogonal axes to swept sinusoidal vibration of constant displacement or constant acceleration within the standard frequency range.

3.8 biaxial test: a test in which the equipment under test is subjected to vibration in the horizontal and the vertical axis simultaneously.

3.9 biaxial multi-frequency random seismic test: a test in which the equipment under test is subjected to a random sequence of vibration derived from the test response spectrum, the test response spectrum being able to reproduce the standard response spectrum through biaxial multi-frequency input motion.

3.10 standard response spectrum: a response spectrum whose waveform conforms to Figure 32, its principal parameters being the damping and the zero period acceleration defined in 3.11 and 3.12.

3.11 damping: a general term characterising the many energy dissipation mechanisms of a system. Note: in practice damping depends on many parameters such as the structure, the mode shape, strain, applied force, velocity, material and joint slip.

3.12 zero period acceleration: the high frequency asymptotic value of the acceleration of the response spectrum (see Figure 32). Note: the zero period acceleration has a physical meaning, since in a time history it represents the largest peak acceleration; it is not to be confused with the peak acceleration of the response spectrum.

3.13 random motion sample: a sample formed by modifying the frequency range and the amplitude of a random motion record so as to reproduce the required response spectrum or the standard response spectrum.

3.14 time-history: a record of the variation with time of the acceleration, displacement or velocity produced by a given motion (see Figure 33).

3.15 strong part of time-history: the part of the time history from the moment the curve first reaches 25 per cent of the maximum value to the moment it finally falls below 25 per cent of the maximum value (see Figure 33).

3.16 conformance test: a test of the conformity of the data flow on a communication channel with the standard conditions, covering access organisation, format, bit sequence, time synchronisation, timing, signal format and level, and reaction to errors; passing the conformance test proves conformity with the standard or with a specified described part of it. [DL/Z 860.2-2006, definition 2.16]

3.17 generic object oriented substation event (GOOSE): on any change of state, an intelligent electronic device multicasts a high speed binary object - the generic object oriented substation event report - by means of a change report. The report generally contains every double point command state of the status inputs, the starting and output elements, the relays and other real or virtual devices. After the first report, the report is generally repeated in sequence at intervals of 2 ms, 4 ms, 8 ms and so on up to 60 000 ms (the delay before the first repetition is not fixed and may be long or short). The generic object oriented substation event report allows a high speed trip signal to be transmitted with a high probability of successful transmission. [DL/Z 860.2-2006, definition 2.44]

3.18 information model: knowledge about a substation function or device, expressed by means of the DL/T 860 standards so as to be visible and accessible; the model describes the actual function or device in a simplified, abstract way. [DL/Z 860.2-2006, definition 2.53]

3.19 merging unit (MU): an interface unit which accepts the analogue and binary inputs of several current and voltage transformers and produces several time-synchronised serial unidirectional multi-point digital point-to-point outputs, exchanging data through logical interfaces 4 and 5. [DL/Z 860.2-2006, definition 2.79]

3.20 negative test: a test verifying that the equipment or system responds correctly by rejecting DL/T 860 conformant information and services that are not implemented in the equipment or system under test, and information and services sent to the equipment or system that are not DL/T 860 conformant. [DL/Z 860.2-2006, definition 2.85]

3.21 sampled value (SV): the model objects and services associated with the sampled values of an exchanged sampled data set, based on a publisher/subscriber mechanism, and the mapping of those model objects and services onto ISO/IEC 8802-3 frames.

3.22 smart terminal: a device connected to the primary plant by cable and to the protection, measurement and control and other secondary equipment by optical fibre, providing the measurement and control functions of a primary item of plant such as a circuit breaker, a disconnector or a main transformer.