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Impedance type integrated circuit bus differential protection in busway

  • Categories:Zhongrui News
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  • Time of issue:2019-05-28 14:24
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(Summary description)Medium impedance type bus differential protection is widely used in systems of 220 kV and above. Foreign company maternal protection products used in China's power system include ABB's REB103, GE's BUS-1000 and Siemens' 7SS10. Domestic manufacturers' products: PMH-150 (RADSS/S) assembled by Shanghai Relay Factory, JMZ, HMZ, JCMZ series produced by Nanjing Electric Power Automation Equipment Factory, PMH-140 series of Xuchang Relay Factory, PMH of Acheng Relay Factory The -40 series is a medium-impedance integrated circuit bus differential protection of ASEA (now ABB). It has more mature operating experience in 220 kV and below systems, but it is still imported in 500 kV systems.

Impedance type integrated circuit bus differential protection in busway

(Summary description)Medium impedance type bus differential protection is widely used in systems of 220 kV and above. Foreign company maternal protection products used in China's power system include ABB's REB103, GE's BUS-1000 and Siemens' 7SS10.

Domestic manufacturers' products: PMH-150 (RADSS/S) assembled by Shanghai Relay Factory, JMZ, HMZ, JCMZ series produced by Nanjing Electric Power Automation Equipment Factory, PMH-140 series of Xuchang Relay Factory, PMH of Acheng Relay Factory The -40 series is a medium-impedance integrated circuit bus differential protection of ASEA (now ABB). It has more mature operating experience in 220 kV and below systems, but it is still imported in 500 kV systems.

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-28 14:24
  • Views:
Information
Medium impedance type bus differential protection is widely used in systems of 220 kV and above. Foreign company maternal protection products used in China's power system include ABB's REB103, GE's BUS-1000 and Siemens' 7SS10.
 
Domestic manufacturers' products: PMH-150 (RADSS/S) assembled by Shanghai Relay Factory, JMZ, HMZ, JCMZ series produced by Nanjing Electric Power Automation Equipment Factory, PMH-140 series of Xuchang Relay Factory, PMH of Acheng Relay Factory The -40 series is a medium-impedance integrated circuit bus differential protection of ASEA (now ABB). It has more mature operating experience in 220 kV and below systems, but it is still imported in 500 kV systems.
 
a. REB103 integrated circuit impedance bus differential protection, is a three-phase ratio braking characteristic of the bus differential protection device, characterized by fast action, device operating time is about 8 ~ 9 ms, the start relay and differential relay action The time is about 1 to 2 ms. In the case where a large power supply system has a through-short circuit and the line TA is fully saturated, the protection device has sufficient stability and reliability, and its sensitivity is substantially unaffected by the number of circuits in the differential circuit. The busbar internal fault, because the detection speed is extremely fast, operates before the TA is saturated, so the saturation characteristics of the line TA are not high. The auxiliary TA can also be used to adjust the total ratio to accommodate different ratios of TA.
 
b. BUS-1000 integrated circuit impedance bus differential protection, configurable monitoring module, with event recording, alphanumeric LCD display, RS-232 interface and IRIG-B clock synchronization function, can achieve communication with the monitoring system.
 
The main technical features are: the main protection component is a three-phase differential current relay with ratio braking and stabilizing resistance; the sensitive differential current detection ensures that the TA circuit can be alarmed and latched out when the TA circuit is open; as long as the design standards are met, TAs with different characteristics and ratios may be used; the fault action time in the zone is <10 ms.
 
c. 7SS10 type integrated circuit bus differential protection, which compares the absolute value of the sum of the currents of each branch and the absolute value of each branch current, the differential element is the first half-wave phase, the ratio differential characteristic, the whole set of actions The time is about 17 ms. This maternal protection system is the technology of Siemens in the 1970s, and the structure and component quality are slightly behind.
 
d. JCMZ series impedance bus differential protection, currently in the wide range of domestic 500 kV and below substation, the 220 kV bus protection of Hunan Power Grid basically adopts this series of bus differential protection. It is a high-speed sensitive medium-impedance current differential protection, suitable for medium-impedance bus differential protection of ultra-high voltage power grids, combining both medium-impedance characteristics and ratio-brake characteristics.
 
It has the following characteristics: fast action speed, fault detection time <3 ms, protection of the whole set of action time <10 ms; in the case of through external faults, even if the TA is saturated, it will not malfunction; when the internal bus is faulty, due to the detection speed Fast, before the TA is completely saturated, the TA saturation characteristics are not high; the auxiliary TA is used to adjust the total ratio, which can adapt to different ratios of TA; Allow the TA secondary loop to have larger loop impedance and easily meet the requirements. The main circuit is simple and reliable.
 
e. PMH-150 (RADSS/S) type medium impedance busbar protection is applicable to ultra-high voltage power grids. There are three types of imported components, semi-imported components and domestic components, but the differential components are imported. Because the busway and the JCMZ series busbar protection device are similar to the medium impedance type current differential protection, the technical characteristics of the two are basically the same.

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