Project Name: Commissioning of Digital Protection Devices in 500kV Smart Substations

Protection Devices: Beijing Sifang GBH326T5-DG-N-211 500kV Main Transformer Protection Set A, H103C5-DG-N-211 500kV Line Protection Device, NARI-Relays GPSL603UC5-2011 Line Protection Device, NR Electric PPC21AN-52-DG 500kV Circuit Breaker Protection Device, PPC78T5N-51A-DG Main Transformer Protection Set B

Test Equipment: Relaystar-7000 Digital-Analog Integrated Relay Protection Tester

Taking the distance protection commissioning of the NARI-Relays GPSL603UC5-2011 Line Protection Device as an example, the commissioning is carried out by using the Relaystar-7000 Digital-Analog Integrated Relay Protection Tester below.

Modify the protection parameter settings of the device and put into operation the relevant distance protection press plates.

Distance Protection Device Settings and Press Plate Configuration

 

Protection Settings		Control Word	Press Plates (Soft/Hard)
Variation start current setting: 0.5A; Zero-sequence start current setting: 0.5A; Positive sequence sensitive angle of line: 80°Earth distance Zone I setting: 4Ω; Earth distance Zone II setting: 6Ω; Earth distance Zone II time: 0.5s; Earth distance Zone III setting: 8Ω; Earth distance Zone III time: 1s	Phase-to-phase distance Zone I setting: 4Ω; Phase-to-phase distance Zone II setting: 6Ω; Phase-to-phase distance Zone II time: 0.5s; Phase-to-phase distance Zone III setting: 8Ω; Phase-to-phase distance Zone III time: 1sLoad limiting resistance setting: 10Ω; Zero-sequence resistance compensation coefficient: 0.67; Zero-sequence reactance compensation coefficient: 0.67	Distance Protection Zone I: EnabledDistance Protection Zone II: EnabledDistance Protection Zone III: Enabled	Distance Protection: Enabled

Use the Distance Protection Test Module of the Relaystar-7000 to conduct automatic multi-zone testing of distance protection.

△ Distance Protection Function Calibration Module

1. Tick the box to select the protection zones for the test.
2. Directly input the protection setting values into the impedance data frame. The settings can be entered in either Z-Φ or R-X mode.
3. The test current set for each zone must be greater than the start current of the protection. For phase-to-phase distance tests, the product of impedance and current is recommended to be 20–40V (not exceeding 57V); for earth distance tests, the product is recommended to be 20–30V (not exceeding 57V). Follow the principle of lower impedance (or reactance) corresponding to higher current to ensure test accuracy.
4. The set test time for each zone must be longer than its set operating time. For example: assuming the set operating time is 0s for Zone I, 0.5s for Zone II and 1.0s for Zone III. Considering the fixed inherent trip delay of the protection, the test time can be set to 0.2s, 0.7s and 1.2s for Zone I, II and III respectively. The ideal test results will be: the zone operates at 0.95 times the setting value; the zone does not operate at 1.05 times, and the next zone also does not operate due to insufficient time. Alternatively, the test time for all three zones above can be set longer than the operating time of Zone III, with the ideal results being: the zone operates at 0.95 times the setting value; the zone does not operate at 1.05 times, while the next zone operates.
5. Input the set operating time of each zone into the Setting Time frame; this parameter is for reference only and does not affect the test results.
6. Switch between Forward and Reverse in the Direction column to conduct directional distance protection tests.
7. Select the fault type to be tested. Single-phase earth fault is used for earth distance impedance calibration, and two-phase short circuit and three-phase short circuit for phase-to-phase distance impedance calibration. For earth distance tests, the zero-sequence compensation coefficient must also be entered correctly.
8. In accordance with common protection calibration requirements, the test software provides four default calibration multiples: 0.8x, 0.95x, 1.05x and 1.2x, and their values can be modified. If the protection operates incorrectly at 0.95x or 1.05x, 0.8x or 1.2x can be selected instead, or a custom multiple can be set for the test.

The action information results of the NARI-Relays GPSL603UC5-2011 Line Protection Device tested in accordance with the above steps are as follows:

 

Zone	State 1 (Normal State)	State 2 (Fault State)		Hold Time	Device Message and Operation
	Hold Time: 2s	Fault Impedance	Impedance Angle		Earth Distance (AN/BN/CN)	Phase-to-phase Distance (AB/BC/CA)
Zone IZset​=4Ω	Three-phase normal voltage, three-phase no current	1.05×Zset​	Forward 80°	0.1s	Protection does not operate	Protection does not operate
		0.95×Zset​	Forward 80°	0.1s	1. Device reports "Earth Distance Zone I Operation"2. Protection single-phase trip output	1. Device reports "Phase-to-phase Distance Zone I Operation"2. Protection three-phase trip output
		0.95×Zset​	Reverse 260°	0.1s	Protection does not operate	Protection does not operate
Zone IIZset​=6Ω	Three-phase normal voltage, three-phase no current	1.05×Zset​	Forward 80°	0.6s	Protection does not operate	Protection does not operate
		0.95×Zset​	Forward 80°	0.6s	1. Device reports "Earth Distance Zone II Operation"2. Protection single-phase trip output	1. Device reports "Phase-to-phase Distance Zone II Operation"2. Protection three-phase trip output
		0.95×Zset​	Reverse 260°	0.6s	Protection does not operate	Protection does not operate
Zone IIIZset​=8Ω	Three-phase normal voltage, three-phase no current	1.05×Zset​	Forward 80°	1.2s	Protection does not operate	Protection does not operate
		0.95×Zset​	Forward 80°	1.2s	1. Device reports "Earth Distance Zone III Operation"2. Protection trip output	1. Device reports "Phase-to-phase Distance Zone III Operation"2. Protection trip output
		0.95×Zset​	Reverse 260°	1.2s	Protection does not operate	Protection does not operate

 

Distance Protection Test Data Results

The Relaystar-7000 supports one-click testing of distance protection, which automates the accuracy verification of setting value actions for all zones and simplifies configuration and device reset operations. In addition, it has the following performance features:

Power Amplifier Output: Standard 12-phase voltage and current output simultaneously, with amplitude, phase and frequency adjustable completely independently.

Hybrid Output: Simultaneous output of power amplifier signals with IEC61850-9-2/9-1 or FT3 signals, meeting test requirements under complex on-site conditions.

Merging Unit Test: Outputs collector, FT3, and power amplifier voltage/current signals, and can read IEC61850-9-2 or FT3 messages of merging units to measure their ratio and angular errors.

Optical Digital Signal Test: Can simulate packet loss, garbled codes, SMV data errors and provide GOOSE storm testing.

Unique 24-channel Output Waveform Recapture and Recording: Intuitively displays output voltage and current waveforms, solving the problem that digital protection devices cannot directly measure and display waveforms.

Complete Parsing of Protection Model Files: Realizes configuration of current/voltage channel selection, proportional coefficient, number of ASDUs, sampling rate, GOOSE information, etc.

Special Test Functions: Including network detection, meeting various test demands.

Double Operation Modes: Standalone operation or PC-connected operation, with identical functions for both modes.

Polarity-free Universal Digital Inputs: Identifiable for dry contacts and potential contacts of any polarity.

8 Channels of Polarity-free Digital Inputs & 4 Channels of Dry Contact Outputs: Facilitating automatic bus transfer and fast switching tests.

Time Synchronization Modes: Supporting second pulse, IRIG-B code or IEEE1588, with a built-in GPS module for direct control; enabling bilateral time synchronization testing for optical fiber pilot protection and other tests.

Verification of Digital Measurement & Control and Protection Units: All units complying with the IEC61850 standard can be verified.

Integrated Testing: Simulable for instantaneous, permanent and converting faults from single-phase to three-phase.

12-phase Current Output: Convenient for three-phase differential protection testing; 24-phase output applicable for automatic bus transfer and busbar protection testing.

We participated in the commissioning project of digital protection devices in smart substations undertaken by the Provincial Electric Power Company and the Provincial Power Transmission & Transformation Engineering Company, and completed the commissioning of all protection devices in the 500kV and 220kV protection rooms. Leaders and technical personnel from the Electric Power Research Institute, Power Supply Bureau and Power Transmission & Transformation Engineering Company expressed their recognition and gratitude for our support and services. They noted that during the entire test process, the relay protection tester featured simple operation, user-friendly interface, easy operation, stable and reliable performance, and its functions and accuracy fully met the requirements of this test.

The recognition and support of users are our inexhaustible driving force for progress. We will continue to strive for excellence, continuously promote technological innovation and upgrading, and serve every professional user with dedication.