A hidden fault diagnosis method for substation relay protection based on multi-dimensional mixed quantity

A technology of recessive fault and relay protection, applied in the field of substation protection, can solve the problems of increasing sampling error, complicated information and logic, poor maintainability, etc., and achieve the effect of improving accuracy and efficiency

Active Publication Date: 2019-10-15
HEFEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the CT / PT wiring is automatically loosened, it will cause zero drift of the sampling, which will increase the sampling error and even cause the circuit to be disconnected.
The second is hidden faults caused by human faults such as software settings or fixed value setting errors, including protection logic errors, poor adaptability of principles and action logic to abnormal situations, unreasonable setting of values, improper human operation or improper maintenance, etc.
However, there is a lack of research on hidden fault detection in relay protection devices. At present, the detection of hidden faults mainly relies on the experience of maintenance personnel after arriving at the scene, and fault location is carried out through the information of the background and relay protection devices. The complicated information of smart substations AND logic makes this manual processing method far from meeting the needs of actual operation
[0005] However, in the smart substation project, with the continuous upgrading of the device site and the continuous research and development of operating equipment, multiple links such as merging units, intelligent terminals, optical fiber terminal boxes, and GOOSE network switches have been added to the relay protection system. The composition of the system is gradually complicated, which also greatly increases the possibility of hidden faults in the relay protection system
However, the current relay protection system is poor in maintainability and highly dependent on integrators, making the relay protection system a "black box". Research on hidden fault detection in relay protection devices is imminent

Method used

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  • A hidden fault diagnosis method for substation relay protection based on multi-dimensional mixed quantity
  • A hidden fault diagnosis method for substation relay protection based on multi-dimensional mixed quantity
  • A hidden fault diagnosis method for substation relay protection based on multi-dimensional mixed quantity

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Embodiment 1

[0057] Such as Figure 1 to Figure 2 As shown, this embodiment discloses a method for diagnosing hidden faults in substation relay protection based on multi-dimensional mixed quantities, including the following steps S1 to S6:

[0058] S1. Collect multi-dimensional parameters in the SV data transmission network, wherein the multi-dimensional parameters include at least operating power parameters, and the operating power parameters include m current sampling voltages U collected in a period T p and m current sampling current I p ;

[0059] It should be noted that, in this embodiment, the actual operation information of the power system can be collected by the CT and PT units, and then the information can be transmitted point-to-point through the SV network.

[0060] S2, respectively according to the m current sampling voltage U p , m current sampling current I p And the theoretical estimated value of voltage and current to calculate the current actual power consumption Q p...

Embodiment 2

[0090] On the basis of the disclosure content of the first embodiment above, this embodiment uses the two-dimensional mixing quantity composed of the operating power parameters and the operating state parameters of the relay protection device as the basis, and uses the operating power parameters to detect the hidden fault of the relay protection device, The type of detected hidden fault is identified by using the historical value and predicted value of the operating state parameter, which has a high accuracy rate.

[0091] It should be noted that the operating state parameters in this embodiment include at least one of the temperature of the relay protection device, the light intensity of the channel, the power supply voltage and the protection setting value.

[0092] Such as Figure 3 to Figure 4 As shown, a method for diagnosing hidden faults of substation relay protection based on multidimensional mixed quantities disclosed in this embodiment includes two processes of hidde...

Embodiment 3

[0124] In this embodiment, substation protection operating state parameters, electric power operating parameters, and operating alarm parameters are used to form a multidimensional mixed quantity, and based on this, hidden faults of relay protection devices are detected, identified, and screened. Wherein the specific parameters of the multidimensional mixing amount are shown in Table 2:

[0125] Table 2

[0126]

[0127] Such as Figure 5 to Figure 7 As shown, a method for diagnosing hidden faults of substation relay protection based on multidimensional mixing quantities disclosed in this embodiment further includes step S8 after the above step S7:

[0128] S8. Based on the alarm information of the relay protection device, the hidden fault identification result is screened to determine the authenticity of the identified hidden fault.

[0129] In practical applications, the diagnostic object of the self-diagnosis function of the relay protection device is limited to the fa...

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Abstract

The invention discloses a substation relay protection hidden fault diagnosis method based on multidimensional mixture, which belongs to the technical field of substation protection. The method comprises the following steps: S1, collecting multidimensional parameters in an SV data transmission network, including m current sampling voltages Up and m current sampling currents Ip collected in a period T; S2, calculating the mean square error of the current actual electricity consumption Qp according to the m current sampling voltages Up and the m current sampling currents Ip; S3, judging whether the mean square error of the current actual electricity consumption Qp is greater than an electricity threshold Delta Q; if the mean square error of the current actual electricity consumption Qp is greater than the electricity threshold Delta Q, performing S4; and if the mean square error of the current actual electricity consumption Qp is not greater than the electricity threshold Delta Q, performing S5, wherein Delta Q=|Q-^|*Epsilon, Q-^ is the current theoretical electricity consumption, and Epsilon is a given setting value; S4, adding 1 to a counter Y; S5, resetting the counter Y to 0; and S6, after n periods T, when judging that Y exceeds a set maximum number Ymax, detecting that a relay protection device has a hidden fault. A hidden fault is detected by running electrical parameters. The detection rate of hidden faults is increased.

Description

technical field [0001] The invention relates to the technical field of substation protection, in particular to a method for diagnosing hidden faults in substation relay protection based on multidimensional mixing quantities. Background technique [0002] Hidden fault refers to the defect of the protection device that will only appear when the power grid fails, which will cause the protection to malfunction or refuse to operate, and even cause cascading faults in the power grid in severe cases. The hidden fault of the relay protection system has no effect on the primary system when the power system is in normal operation. When the system experiences disturbance or fault, the power system power flow redistribution may cause the protection device with hidden fault to malfunction and expand the scope of the accident. , and even cause large-scale power outages. [0003] From the perspective of incentives, hidden faults can be divided into two categories: one is hidden faults cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/28
Inventor 陶伟龙唐小平傅浩韩光谈韵黄文焘杨志纲张骏汤雪鹏秦鹏苏寒关少卿唐俊李聪聪汪本清
Owner HEFEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER
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