DL/T 2030-2019Power transmission and transformation loop reliability evaluation procedures (English PDF)

3.1 Principle of circuit division

The circuit division should conform to the following principles.

a) A single element should belong to a loop at a point in time.

b) The internal components of combined electrical appliances (including GIS, H-GIS, PASS, COMPASS, etc.) should be divided into in the corresponding loop.

c) The circuit boundary components of the bus circuit, the substation circuit and the transmission circuit should be the components with breaking function, and the circuit boundary the components belong to the bus circuit.

3.2 Transformer circuit

3.2.1 The transformer body and the equipment within the boundary point of the bus circuit on each side (excluding the bus side isolating switch) are classified as transformer Electric circuit. The substation circuit of the line substation includes the equipment within the demarcation point of the line and the bus circuit of the substation on each side. Single-phase transformation the three-phase transformer group composed of transformers is counted as a substation loop. Statistics on AC side of converter transformer in DC converter station it is a substation loop, including the following situations.

a) Conventional DC converter station (converter station of ±660kV and below). the top wiring board of the grid-side bushing of each pole converter transformer all equipment between the connection points of the AC field bus circuit is defined as a substation circuit.

b) Back-to-back DC converter station. the top wiring board of the grid-side bushing of the converter transformer on each side of each unit to the AC field bus bar of that side all devices between the connection points are defined as a substation circuit.

c) UHV DC converter station (±800kV and above converter station). high-end (or low-end) converter transformer grid side of each pole all equipment between the wiring board at the top of the bushing and the connection point of the AC field bus circuit is defined as a substation circuit.

3.2.2 The substation circuit is named with "substation name" plus "voltage level" plus "transformer name", and the line substation circuit is named "Voltage level" plus "line name" is named.

3.3 Transmission circuit

3.3.1 The transmission line body and the equipment within the demarcation point of the bus circuit of the substation connected to each side (excluding bus side isolation Switch) is divided into transmission circuits.

3.3.2 The transmission circuit is named with "voltage level" plus "line name".

3.4 Bus circuit

3.4.1 All busbars of the same voltage level in the substation and the communication equipment between them, including the isolation that is directly connected to the busbar the components that are connected to the bus and do not form a loop separately should be classified as bus loops. The same in the same substation the busbars with no direct electrical connection should be divided into different busbar circuits.

3.4.2 The bus circuit is named with "Substation Name" plus "Voltage Level". There are multiple for the same voltage level in the same substation.

For the bus circuit, name it with "Substation Name" plus "Voltage Level" plus the bus circuit group number.

4.1 Use

The loop will be used as a statistical object since it is put into production. Usage status is divided into available status and unavailable status state. Refer to Figure 1 for the state of loop reliability, and refer to Appendix A for the comparison table of Chinese and English states.

Figure 1 Divide the reliability status of the loop

4.1.1 Available

The circuit is in the state of running or dispatching outage, and it is judged to be available.

4.1.1.1 Operation

The state where the loop is electrified and can complete the power transmission function within a certain capacity range is judged to be the operating state.

4.1.1.2 Outage

The circuit loses the function of transmitting electric energy from one end to the other within a certain capacity range, and it is judged to be out of service.

state. When only part of the circuit loses the power transmission function, it is determined that the circuit is partially out of operation.

4.1.1.3 Dispatch outage

The outage of the loop caused by the dispatch command due to the adjustment of the system operation mode is judged as the dispatch outage state.

4.1.2 Not available

The circuit is in the state of affected shutdown, planned shutdown or failure shutdown, and it is judged as unavailable.

4.1.2.1 Affected outage

The forced outage caused by the related circuit outage or external reasons, etc., is judged to be the affected outage state.

4.1.2.2 Planned outage

Due to the internal components of the loop (including secondary systems, auxiliary facilities, etc.), it is necessary to submit an application to the dispatcher 24 hours in advance.

Please and obtain the approval of the shutdown, and determine the planned shutdown status.

4.1.2.3 Failure shutdown

Any outage of the loop that has not been approved by the dispatch, or although approved by the dispatch, it cannot be delayed until the outage after 24 hours (from Start timing from the dispatch application), it is judged as a fault shutdown state.

4.1.3 Instantaneous shutdown

The outage of the circuit whose duration does not exceed 1 min is judged as an instantaneous outage state, such as automatic reclosing of the transmission circuit the coincidence is successful.

4.1.3 Conversion factor of circuit outage

For partial outage loop events, the coefficient determined by considering the influence of outage on loop function is expressed by lambda.

5.1 Basic indicators

5.1.1 Equivalent hours of loop dispatch outage

The equivalent hours of loop dispatch outage are calculated according to formula (3).

[Hours] (3)

5.1.2 Equivalent hours when the circuit is affected and out of operation.

The equivalent hours of circuit involvement and outage are calculated according to formula (4).

[Hours] (4)

5.1.3 Equivalent hours of planned outage of loop.

The equivalent hour of the planned outage of the loop is calculated according to formula (5).

[Hours] (5)

5.1.4 Hours of loop failure.

The equivalent hours of circuit failure and shutdown are calculated according to formula (6).

[Hours] (6)

5.1.5 Equivalent hours when the circuit is unavailable.

The unavailable equivalent hours of the circuit are calculated according to formula (7).

[Hours] (7)

5.2 General indicators

5.2.1 Loop availability factor.

The loop available coefficient is calculated according to formula (8).

5.2.2 Loop outage rate.

The loop outage rate is calculated according to formula (9).

[Times/Circuit·Year] (9)

5.2.2.1 Loop dispatch outage rate.

The loop dispatch outage rate is calculated according to formula (10).

[Times/Circuit·Year] (10)

5.2.2.2 Involved outage rate of loop.

The outage rate of the loop involved is calculated according to formula (11).

[Times/Circuit·Year] (11)

5.2.2.3 The planned outage rate of the loop.

The planned outage rate of the loop is calculated according to formula (12).

[Times/Circuit·Year] (12)

5.2.2.4 Outage rate of loop failure.

The outage rate of loop failure is calculated according to formula (13).

[Times/Circuit·Year] (13)

5.2.2.5 The instantaneous outage rate of the circuit.

The instantaneous outage rate of the loop is calculated according to formula (14).

[Times/Circuit·Year] (14)

5.2.3 Circuit outage time.

The outage time of the loop is calculated according to formula (15).

[Hours] (15)

5.2.3.1 Outage time for loop scheduling.

The outage time of loop dispatch is calculated according to formula (16).

[Hours] (16)

5.2.3.2 Outage time when the circuit is affected.

The cycle involved and outage time is calculated according to formula (17).

[Hours] (17)

5.2.3.3 The planned shutdown time of the loop.

The planned outage time of the loop is calculated according to formula (18).

[Hours] (18)

5.2.3.4 Outage time for loop failure.

The outage time of loop failure is calculated according to formula (19).

[Hours] (19)

5.2.4 Recovery time of circuit outage.

The recovery time of loop outage is calculated according to formula (20).

[Hour/time] (20)

5.2.4.1 Recovery time of loop dispatch outage.

The recovery time of loop dispatch outage is calculated according to formula (21).

[Hour/Time] (21)

5.2.4.2 The recovery time of the circuit affected by outage.

The recovery time of the circuit from the affected outage is calculated according to formula (22).

[Hour/Time] (22)

5.2.4.3 Recovery time of planned outage of loop.

The recovery time of the planned outage of the loop is calculated according to formula (23).

[Hour/Time] (23)

5.2.4.4 Recovery time of circuit failure out of operation.

The recovery time of circuit failure out of operation is calculated according to formula (24).

[Hour/Time] (24)

5.2.5 Other indicators of the loop

5.2.6.1 N times repeated outage rate of loop.

The loop N repeated outage rate is calculated according to formula (25).

[Times/loop·year] (25)

5.2.6.2 Proportion of circuits without outage.

The proportion of circuits without outage is calculated according to formula (26).

5.3 Dedicated indicators for transmission circuits

5.3.1 Availability factor of transmission circuit.

The available coefficient of the transmission circuit is calculated according to formula (27).

5.3.2 Outage rate of transmission circuit.

The outage rate of the transmission circuit is calculated according to formula (28).

[Times/100 kilometers·year] (28)

5.3.2.1 Dispatching outage rate of transmission circuit.

The dispatching outage rate of the transmission circuit is calculated according to formula (29).

[Times/100 kilometers·year] (29)

5.3.2.2 The involved outage rate of the transmission circuit.

The involved outage rate of the transmission circuit is calculated according to formula (30).

[Times/100 kilometers·year] (30)

5.3.2.3 Planned outage rate of transmission circuit.

The planned outage rate of the transmission circuit is calculated according to formula (31).

[Times/100 kilometers·year] (31)

5.3.2.4 Failure outage rate of transmission circuit.

The failure rate of the transmission circuit is calculated according to formula (32).

[Times/100 kilometers·year] (32)

5.3.2.5 Instantaneous outage rate of transmission circuit.

The instantaneous outage rate of the transmission circuit is calculated according to formula (33).

[Times/100 kilometers·year] (33)

5.3.3 Outage time of transmission circuit.

The outage time of the transmission circuit is calculated according to formula (34).

[Hours] (34)

5.3.3.1 Dispatching outage time of transmission circuit.

The scheduled outage time of the transmission circuit is calculated according to formula (35).

[Hours] (35)

5.3.3.2 The involved outage time of the transmission circuit.

The involved outage time of the transmission circuit is calculated according to formula (36).

[Hours] (36)

5.3.3.3 The planned shutdown time of the transmission circuit.

The planned outage time of the transmission circuit is calculated according to formula (37).

[Hours] (37)

5.3.3.4 Outage time of transmission circuit failure.

The outage time of the transmission circuit fault is calculated according to formula (38).

[Hours] (38)

5.4 Comprehensive indicators of different types of loops

5.4.1 Comprehensive availability factor of loop.

The loop comprehensive available coefficient is calculated according to formula (39).

5.4.2 Comprehensive outage rate of loop.

The comprehensive outage rate of the loop is calculated according to formula (40).

[Times/Circuit·Year] (40)

5.4.2.1 Outage rate of loop comprehensive dispatch.

The outage rate of loop comprehensive dispatch is calculated according to formula (41).

[Times/Circuit·Year] (41)

5.4.2.2 Loop comprehensively affected outage rate.

The comprehensively affected outage rate of the loop is calculated according to formula (42).

[Times/Circuit·Year] (42)

5.4.2.3 The comprehensive planned outage rate of the loop.

The comprehensive planned outage rate of the loop is calculated according to formula (43).

[Times/Circuit·Year] (43)

5.4.2.4 Outage rate of integrated circuit failure.

The comprehensive fault outage rate of the loop is calculated according to formula (44).

[Times/Circuit·Year] (44)

5.4.3 Integrated circuit shutdown time.

The comprehensive outage time of the circuit is calculated according to formula (45).

[Hours] (45)

5.4.3.1 Integrated circuit outage time.

The outage time of loop comprehensive dispatch is calculated according to formula (46).

[Hours] (46)

5.4.3.2 Circuit comprehensively affected outage time.

The comprehensive involved outage time of the loop is calculated according to formula (47).

[Hours] (47)

5.4.3.3 Comprehensive planned shutdown time of the loop.

The comprehensive planned outage time of the loop is calculated according to formula (48).

[Hours] (48)

5.4.3.4 Integrated circuit failure shutdown time.

The comprehensive fault shutdown time of the loop is calculated according to formula (49).

[Hours] (49)

5.4.4 Recovery time of integrated circuit shutdown.

The comprehensive outage recovery time of the loop is calculated according to formula (50).

[Hour/time] (50)

5.4.4.1 Recovery time of integrated circuit outage.

The recovery time of integrated loop dispatching outage is calculated according to formula (51).

[Hour/Time] (51)

5.4.4.2 The recovery time of comprehensively affected outage of the circuit.

The recovery time of the comprehensively affected outage of the loop is calculated according to formula (52).

[Hour/Time] (52)

5.4.4.3 Recovery time of comprehensive planned outage of circuit.

The recovery time of the comprehensive planned outage of the loop is calculated according to formula (53).

[Hour/Time] (53)

5.4.4.4 The recovery time of integrated circuit failure shutdown.

The recovery time of the integrated circuit failure outage is calculated according to formula (54).

[Hour/Time] (54)