Protection Device: CSC-103 Line Protection Device

Test Equipment: Relaystar-Z70 Handheld Digital-analog Integrated Relay Protection Tester

△ Relaystar-Z70 Handheld Digital-analog Integrated Relay Protection Tester

Compared with the commissioning of EHV line protection devices in conventional substations, the main difference in smart substations lies in the IEC 61850 digital quantity configuration. This paper briefly introduces how to use the Relaystar-Z70 Handheld Digital-analog Integrated Relay Protection Tester to conduct optical fiber differential protection tests on the CSC-103 Line Protection Device.

1. Tester-related Settings

IEC 61850 Digital Quantity Settings for Relaystar-Z70

1. Parse the SCD file: Open the SCD file in the IEC 61850 module, locate the IED name of the protection device to be tested, or find it by searching the IED name. The control block information on the right displays the GOOSE and SV information of the selected IED; the imported GOOSE is shown in the lower left corner, and the imported SV is shown in the lower right corner.

△ SCD File Parsing Diagram

 

2. Configure SV control block information: Click the operation arrow of the imported PL2201 to enter the SV control block settings, select channel 1, and automatically map the current and voltage to IABC and UABC.

 

3. Configure GOOSE control block information: Click the imported PL2201A control block, change the type to Subscribe, click the operation arrow to enter the GOOSE control block settings, select channel 2, and map the corresponding trip input quantities.

△ Input Quantity Mapping Configuration

4. Click the imported IL2201A control block, change the type to Publish, click the operation arrow to enter the GOOSE control block settings, select channel 2, and map the corresponding switch position output quantities.

△ Output Quantity Mapping Configuration

 

5. Configured SV and GOOSE control blocks:

 

△ SV/GOOSE Configuration

6. Configure SMV ratio settings in the output configuration menu. Only modify the primary rated values of voltage and current here; the default settings for other parameters can be retained.

△ SMV Ratio Configuration

Upon completion of the above operations, the IEC 61850 configuration for the CSC-103 Protection Device is finalized.

Tester Optical Fiber Wiring Operation

Connect Optical Port 1 of the Relaystar-Z70 to Port 2 of the SV board of the protection device for applying quantities to the protection device. Connect Optical Port 2 to Port 2 of the GOOSE board of the protection device for applying switch positions to the protection device and collecting the operation time of the protection device.

△ Optical Fiber Wiring Diagram

2. Protection-related Settings

Protection Fixed Value Control Word Settings

Serial Number	Fixed Value Name	Value	Serial Number	Fixed Value Name	Value
01	Differential Startup Current Setting Value	0.1A	09	Pilot Differential Protection	1
02	Zero-sequence Startup Current Setting Value	0.2A	10	CT Disconnection Blocking Differential Protection	0
03	Differential Operating Current Setting Value	2A	11	Internal Communication Clock	1
04	Local Side Identification Code	1	12	Channel Loopback Test	1
05	Remote Side Identification Code	1	13	Single-phase Auto-reclosing	1
06	Single-phase Auto-reclosing Time	0.8s	14	Three-phase Auto-reclosing	0
07	Three-phase Auto-reclosing Time	2s	15	Auto-reclosing Forbidden	0
08	-	-	16	Auto-reclosing Lockout	0

Protection Press Plate Settings

In the Press Plate Fixed Value interface, set the Differential Protection soft press plate to "1". On the protection panel, open the Maintenance function hard press plate and check that the optical fiber channel of the protection device is in the loopback state.

3. Optical Fiber Differential Protection Test Method

The main interface of the Relaystar-Z70 includes four main test modules: General Test, Special Test, Network Analysis and Advanced Test.

△ Relaystar-Z70 Software Main Interface

Verify the Operation Status at 0.95 Times the Setting Value

1. Simulate Phase A grounding fault: Based on the differential setting value of 2.0A, the calculated differential current test value is 2×0.5×0.95 = 0.95A.Add two states in the State Sequence menu.

State 1 Settings: UA=UB=UC=57.734V, IA=IB=IC=0A; both voltage and current are positive-sequence; trigger mode: Key Trigger.

△ Normal State Parameter Settings

State 2 Settings: UA=UB=UC=57.734V, IA=0.95A; both voltage and current are positive-sequence; trigger mode: Time Trigger (100ms).

△ Fault State Parameter Settings

State 3 Settings: UA=UB=UC=57.734V, IA=IB=IC=0A; both voltage and current are positive-sequence; trigger mode: Time Trigger (1000ms).

△ Reclosing State Parameter Settings

 

2. Apply quantities: Click Run after completing the settings. When the charging indicator light is on, switch to the next state. The Relaystar-Z70 outputs the fault state for the set duration of 100ms.

 

 

3. Test Results: The protection device does not operate, and the Relaystar-Z70 does not collect a trip signal.

 

Verify the Operation Status at 1.05 Times the Setting Value

Simulate Phase A grounding fault: Based on the differential setting value of 2.0A, the calculated differential current test value is 2.0×1.05×0.5 = 1.05A.

1. Add pre-fault and fault states in the State Sequence menu; the settings for State 1 and State 3 are shown in the figures above.

State 2 Settings: UA=UB=UC=57.734V, IA=1.05A; both voltage and current are positive-sequence; trigger mode: Time Trigger (100ms).

△ Fault State Parameter Settings

 

2. Apply quantities: Click Run after completing the settings. When the charging indicator light is on, switch to the next state. The Relaystar-Z70 outputs the fault state for the set duration of 100ms, and then switches to the reclosing state for 1s output.

 

3. Test Results: The protection device operates with the trip signal light on, and the Relaystar-Z70 receives the trip signal sent by the protection device. The tester measures a differential operation time of 32ms for Input Quantity A in GOOSE Switch Status 2, and a reclosing time of 832ms for Input Quantity R in Status 3.

△ Protection Device Operation Status

Verify the Operation Time at 1.2 Times the Setting Value

Simulate Phase A grounding fault: Based on the differential setting value of 2.0A, the calculated differential current test value is 2.0×1.2×0.5 = 1.2A. Set IA in State 2 to 1.2A, and refer to the test for 1.05 times the setting value for other configurations. The measured differential operation time is 31ms.

△ Protection Operation Time Test

The test results show that the commissioning method for optical fiber differential protection in smart substations is similar to that in conventional substations, with the key focus on digital quantity configuration. Only one configuration is required for the same protection device, after which other backup protection tests can be performed.