Rapid distance protection test method-haomai relay tester

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Rapid distance protection test method

Publish Date:2024/09/05武汉市豪迈电力自动化技术有限责任公司

Protection device: CSC-103 line protection device
Testing equipment: Relaystar-Z70 handheld digital analog integrated relay protection tester

Fast distance protection mainly determines the action time of the protection device based on the impedance or distance between the measured fault point and the installation location of the protection device, and is particularly suitable for near end fault protection of ultra-high voltage transmission lines. When the short-circuit point is close to the protection installation location, the measured impedance is small and the action time is short; When the short-circuit point is far away from the protection installation site, the measured impedance increases and the action time increases, ensuring that the protection selectively cuts off the faulty line and has high sensitivity and reliability.
The following introduces the use of the Jibaoxing-Z70 handheld digital analog integrated relay protection tester to complete the CSC-103 fast distance protection test, paying attention to distinguishing it from the distance I section test.

Protection device settings：

1) Protection constant control word setting: (distance protection section)

Number	Fixed value name	Value	Number	Fixed value name	Value
1	Fixed value of grounding distance in section I	6Ω	14	Longitudinal differential protection	0
2	Fixed value of grounding distance II section	10Ω	15	Distance protection section I	1
3	Grounding distance II period of time	0.5s	16	Distance Protection Section II	1
4	Grounding distance III segment fixed value	18Ω	17	Distance protection section III	1
5	Grounding distance III period of time	1.5s	18	Fast distance protection	1
6	Fixed value of interval distance I	6Ω	19	Zero sequence current protection	0
7	Phase to phase distance II fixed value	10Ω	20	Single phase reclosing	0
8	Phase II interval distance	0.5s	21	Three phase reclosing	0
9	Phase to phase distance III fixed value	18Ω	22	Prohibit reclosing	1
10	Interval distance III period of time	1.5s	23	Disable reclosing	0
11	Fixed value of load limiting resistor	2Ω	24	Current compensation	0
12	Zero sequence reactance compensation coefficient	0.67	25	CT secondary rated value	1A
13	Zero sequence resistance compensation coefficient	0.67

2) Protection pressure plate setting:

Set the "Distance Protection" soft pressing plate to "1" and the other functional soft pressing plates to "0".

Test wiring:

△Wiring diagram

Jibaozhixing-Z70 handheld digital analog integrated relay protection tester has functions of protection, merging unit, intelligent terminal testing, and network analyzer digital protection analysis. The Jibao Xing-Z70 will output SV to the protection device through optical fiber, while receiving the action time sent by the protection device through GOOSE. The tester will be connected to the direct sampling and jumping port of the protection.

Test method:

Open the main interface of the software, select the state sequence test module in the general testing category to set parameters, simulate the test conditions from normal state to fault state, and set the state to normal state.

△ Software main interface

△ Normal state parameter settings

State 2: Fault state. Simulate A phase to ground, fault voltage UA=(1+k) I * Z=1.67 * 6 * 2=0.004V. The principle of Beijing Sifang's fast distance input: distance protection input, fast distance control word input, line total length set to 50km or more, 5 times or more rated current, fault time less than 30ms, and fault within 50% of the set value of section I.

△Fault state parameter setting

After completing the above parameter settings, the experiment can begin. Once the status is checked, the protection sampling is normal. After waiting for the PT to disconnect and return, press the button to trigger the protection action.

△ Fast distance action message

Test Conclusion

The fast distance protection is similar to the distance I section test method, with the difference being the action time and action message. The fast distance action message is "distance I section action", but without X or R values, and the action time is less than 17ms, while the distance I section action message is "distance I section action, with X and R values, and an action time of about 30ms.

△ Distance I segment action message

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备案号：鄂ICP备05010718号-1

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Rapid distance protection test method