# US 2021/0278464 A1 · Condition assessment method and device for an outdoor post-mounted vacuum switch

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- Number: US 2021/0278464 A1
- Document ID: US20210278464A1
- Status: Published application
- Kind: A1
- Application number: 16/497,644
- Filed: 2018-12-11
- Published: 2021-09-09
- Earliest claimed: 2018-01-23
- Assignees: State Grid Jiangxi Electric Power Company Limited Research Institute; State Grid Corporation of China; Nanchang Kecheng Electric Power Test and Research Co., Ltd.
- Applicants: State Grid Jiangxi Electric Power Company Limited Research Institute; State Grid Corporation of China; Nanchang Kecheng Electric Power and Research Co., Ltd.
- Inventors: Ning Xu; Jianbing Pan; Ruixiang Fan; Zaide Xu; Bei Cao; Yang Liu; Yuan Xu; Hongxia Xiao
- Web page: https://patentgrep.com/patent/US20210278464A1

## CPC

- G01R 31/3275: {Fault detection or status indication}
- H01H 33/668: Means for obtaining or monitoring the vacuum
- G06F 30/367: Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
- G06F 30/20: Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30)
- G06F 2113/04: Power grid distribution networks
- G06F 2119/02: Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
- G06F 2119/04: Ageing analysis or optimisation against ageing
- G06F 2119/06: Power analysis or power optimisation
- G06F 2119/08: Thermal analysis or thermal optimisation
- G06F 2119/12: Timing analysis or timing optimisation
- G06Q 10/20: Administration of product repair or maintenance
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR

## Abstract

Disclosed is a condition assessment method for an outdoor post-mounted vacuum switch. The method includes: establishing a condition assessment mathematical model for the post-mounted vacuum switch and acquiring scores of condition indicators of the post-mounted vacuum switch; and acquiring a condition assessment score based on the condition assessment mathematical model of the post-mounted vacuum switch and according to the scores of the condition indicators of the post-mounted vacuum switch so as to realize on-line monitoring of a health condition of the post-mounted vacuum switch and assess the health condition of the post-mounted vacuum switch. Further disclosed is a condition assessment device for the outdoor post-mounted vacuum switch.

## Claims

### Claim 1

A condition assessment method for an outdoor post-mounted vacuum switch, comprising:
establishing a condition assessment mathematical model for the post-mounted vacuum switch, and obtaining scores of condition indicators of the post-mounted vacuum switch; and
acquiring a condition assessment score according to the scores of the condition indicators of the post-mounted vacuum switch and the condition assessment mathematical model of the post-mounted vacuum switch, so as to realize on-line monitoring of a health condition of the post-mounted vacuum switch and assess the health condition of the post-mounted vacuum switch;
wherein the condition assessment mathematical model of the post-mounted vacuum switch is:
M
=
M
0
-
∑
i
=
1
10
⁢
⁢
M
i
,
wherein the M is the condition assessment score; Mi denotes the score of the ith condition indicator of the post-mounted vacuum switch; and M0=100 KTXf, Xf denotes a repair coefficient, and a lifetime coefficient KT=(100−0.5Y)/100, wherein the Y denotes a service life.

### Claim 2 (depends on 1)

The method of claim 1, wherein the condition indicators of the post-mounted vacuum switch comprise at least one of:
a condition indicator of a lightning parameter, a temperature condition indicator of a feeder terminal unit (FTU) battery, a communication condition indicator, a condition indicator of a transformer, a voltage condition indicator of the FTU battery, a switch opening and closing condition indicator, a switch opening time condition indicator, an on-off characteristic condition indicator, a switch refuse operation condition indicator, or a switch maloperation condition indicator.

### Claim 3 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprises the condition indicator of the lightning parameter;
wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
collecting an amplitude I of a lightning current at a tower, a distance S between a lightning strike point and the tower, and a height hc of the tower of the post-mounted vacuum switch through lightning location, and calculating a direct lightning stroke
U
0
=
25
⁢
I
⁢
h
c
S
or a lightning induced overvoltage
U
0
=
25
⁢
I
⁡
[
h
c
S
+
(
h
c
S
)
2
+
1
]
;
and
analyzing the value of U0 according to a first preset analysis rule to obtain the score of the condition indicator of the lightning parameter;
wherein the first preset analysis rule comprises: a weight being a first preset value; when the U0 is less than or equal to 85 kV, the score of the condition indicator of the lightning parameter being the first preset value; when the U0 is greater than 85 kV and less than 140 kV or the U0 is equal to 140 kV, the score of the condition indicator of the lightning parameter being a first score value, and the first score value being less than the first preset value; and when the U0 is greater than 140 kV, the score of the condition indicator of the lightning parameter being reducing the first score value by a first preset deduction value every increment 1 kV of the U0 on the basis of 140 kV.

### Claim 4 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprise the condition indicator of a temperature of the FTU battery;
wherein the obtaining the score of the condition indicators of the post-mounted vacuum switch comprises:
collecting an internal temperature value of the FTU battery in real time; and, analyzing the internal temperature value of the FTU battery according to a second preset analysis rule to obtain the score of the temperature condition indicator of the FTU battery;
wherein the second preset analysis rule comprises: a weight being a second preset value; when the internal temperature value of the FTU battery is greater than −25.0° C. and less than 55.0° C., the score of the temperature condition indicator of the FTU battery being the second preset value; when the internal temperature value of the FTU battery is greater than 55.1° C. and less than 64.9° C. or when the internal temperature value of the FTU battery is greater than −34.9° C. and less than −25.1° C., the score of the temperature condition indicator of the FTU battery being a second score value; when the internal temperature value of the FTU battery is greater than 65° C. and less than 69.999° C. or when the internal temperature value of the FTU battery is greater than −39.9° C. and less than −35.1° C., the score of the temperature condition indicator of the FTU battery being a third score value; and when the internal temperature value of the FTU battery is greater than or equal to 70° C. or when the internal temperature value of the FTU battery is less than or equal to −40° C., the score of the temperature condition indicator of the FTU battery is zero; wherein the second score value is less than the second preset value, and the third score value is less than the second score value.

### Claim 5 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprise the voltage condition indicator of the FTU battery;
wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
acquiring a real voltage Ubat of the FTU battery; and
analyzing the value of Ubat according to a third preset analysis rule to obtain the score of the voltage condition indicator of the FTU battery;
wherein the third preset analysis rule comprises: a weight being a third preset value; when the Ubat is greater than or equal to 26V, the score of the voltage condition indicator of the FTU battery being the third preset value; when the Ubat is less than 21V, the score of the voltage condition indicator of the FTU battery is 0; and when the Ubat is greater than 21 V and less than 26V or when the Ubat is equal to 21V, the score of the voltage condition indicator of the FTU battery is reducing the third preset value by a second preset deduction value every decrement 1V of the Ubat on the basis of the third preset value.

### Claim 6 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprise the communication condition indicator;
wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
acquiring a time of the post-mounted vacuum switch; and
analyzing the time according to a fourth preset analysis rule to obtain the score of the communication condition indicator;
wherein the fourth preset analysis rule comprises: a weight being a fourth preset value; when an absolute value of a difference between a time of a server and the time of the post-mounted vacuum switch is less than a preset time threshold value, confirming that the post-mounted vacuum switch is in normal communication and the score of the communication condition indicator is the fourth preset value; and when the absolute value of the difference between the time of the server and the time of the post-mounted vacuum switch is not less than the preset time threshold value, confirming that the post-mounted vacuum switch is in abnormal communication and the score of the communication condition indicator is 0.

### Claim 7 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprise the condition indicator of the transformer; wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
acquiring a voltage value and a tri-phase unbalance factor of a current; and
respectively analyzing the voltage value and the tri-phase unbalance factor of the current according to a fifth preset analysis rule to obtain the score of the condition indicator of the transformer;
wherein the fifth preset analysis rule comprises: when the tri-phase unbalance factor of the current is less than a preset percentage, a first part score of the condition indicator of the transformer being a fourth score value; when the tri-phase unbalance factor of the current is not less than the preset percentage, the first part score of the condition indicator of the transformer is 0; in the case of not being grounded, when the voltage value is greater than 5.5 kV and less than 6.5 kV or when the voltage value is equal to 5.5 kV or when the voltage value is equal to 6.5 kV, a second part score of the condition indicator of the transformer being the fourth score value; in the case of not being grounded, when the voltage value is less than 5.5 kV or greater than 6.5 kV, the second part score of the condition indicator of the transformer is 0; wherein the score of the condition indicator of the transformer titer being a sum of the first part score of the condition indicator of the transformer and the second part score of the condition indicator of the transformer.

### Claim 8 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprise the switch opening and closing condition indicator;
wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
determining whether the post-mounted vacuum switch is in an opening state or a closing state, and acquiring a current value in the opening state or the closing state; and
analyzing according to a sixth preset analysis rule in conjunction with the opening state of the post-mounted vacuum switch or the closing state of the post-mounted vacuum switch and the current value to obtain the score of the switch opening and closing condition indicator;
wherein the sixth preset analysis rule comprises: a weight being a fifth preset value; when the post-mounted vacuum switch is in the opening state and the current value is less than 3A, the score of the switch opening and closing condition indicator being the fifth preset value; when the post-mounted vacuum switch is in the opening state and the current value is not less than 3A, the score of the switch opening and closing condition indicator being 0; when the post-mounted vacuum switch is in the closing state and the current value is greater than 3A, the score of the switch opening and closing condition indicator being the fifth preset value; and when the post-mounted vacuum switch is in the closing state and the current value is not greater than 3A, the score of the switch opening and closing condition indicator being 0.

### Claim 9 (depends on 2)

The method of claim 2, wherein the condition indicators of the post-mounted vacuum switch comprise the switch opening time condition indicator; wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
acquiring a switch opening time of the post-mounted vacuum switch; and
analyzing the switch opening time of the post-mounted vacuum switch according to a seventh preset analysis rule to obtain the score of the switch opening time condition indicator;
wherein the seventh preset analysis rule comprises: a weight being a sixth preset value; when the switch opening time is less than 30 ms, the score of the switch opening time condition indicator being the sixth preset value; when the switch opening time is more than 30 ms and less than 50 ms or when the switch opening time is equal to 30 ms, the score of the switch opening time condition indicator being a fifth score value; when the switch opening time is greater than 50 ms and less than 100 ms or when the switch opening time is equal to 50 ms, the score of the switch opening time condition indicator being a sixth score value; and when the switch opening time is greater than or equal to 100 ms, the score of the switch opening time condition indicator being 0; wherein the fifth score value is less than the sixth preset value, and the sixth score value is less than the fifth score value.

### Claim 10 (depends on 2)

The method of claim 2, wherein the scores of the condition indicators of the post-mounted vacuum switch comprise a bonus value and a deduction value;
and wherein the score of the condition indicator of the post-mounted vacuum switch is a result of subtraction operation with the deduction value on the basis of the bonus value.

### Claim 11 (depends on 10)

The method of claim 10, wherein the bonus value is used for addition operation of the scores of at least one of the following condition indicators: the score of the condition indicator of the lightning parameter, the score of the temperature condition indicator of the FTU battery, the score of the communication condition indicator, the score of the condition indicator of the transformer, the score of the switch opening and closing condition indicator, the score of the voltage condition indicator of the FTU battery, or the score of the switch opening time condition indicator;
the deduction value comprises at least one of: the score of the switch on-off characteristic condition indicator, the score of the switch refuse operation condition indicator, or the score of the switch maloperation condition indicator.

### Claim 12 (depends on 11)

The method of claim 11, wherein the condition indicators of the post-mounted vacuum switch comprise the switch on-off characteristic condition indicator; and the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprising:
acquiring a number of opening-closing failures of a circuit breaker and a fault current; and
analyzing the opening-closing failure times and the fault current according to an eighth preset analysis rule to obtain the score of the switch on-off characteristic condition indicator;
wherein the eighth preset analysis rule comprises: when the fault current is greater than OA and less than 5000A, the score of the switch on-off characteristic condition indicator being reducing the bonus value by a third preset deduction value; when the fault current is greater than 5000A and less than 10000A or when the fault current is equal to 5000A, the score of the switch on-off characteristic condition indicator being reducing the bonus value by a fourth preset deduction value; when the fault current is greater than 10000A and less than 16000A or when the fault current is equal to 10000A, the score of the switch on-off characteristic condition indicator being reducing the bonus value by a fifth preset deduction value; when the fault current is greater than or equal to 16000A and the number of the opening-closing failures of the circuit breaker is less than 30, the score of the switch on-off characteristic condition indicator being reducing the bonus value by a sixth preset deduction value; and when the cumulative number of times the fault current being more than 10000A is more than 30, the score of the switch on-off characteristic condition indicator being reducing the bonus value by a seventh preset deduction value.

### Claim 13 (depends on 12)

The method of claim 12, wherein the third preset deduction value is a product of the number of on-off failures of the circuit breaker and 0.004, the fourth preset deduction value is a product of the number of on-off failures of the circuit breaker and 0.04, the fifth preset deduction value is a product of the number of on-off failures of the circuit breaker and 0.4, the sixth preset deduction value is a product of the number of on-off failures of the circuit breaker and 2; and the seventh preset deduction value is 40.

### Claim 14 (depends on 11)

The method of claim 11, wherein the condition indicators of the post-mounted vacuum switch comprise the switch refuse operation condition indicator;
wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
counting a number of switch refuse operations of the post-mounted vacuum switch; and
analyzing the number of switch refuse operations according to a ninth preset analysis rule to obtain the score of the refuse operation condition indicator;
wherein the ninth preset analysis rule comprises: every time the switch refuse operation occurs, the score of the switch refuse operation condition indicator being reduced by an eighth preset deduction value on the basis of the bonus value; if the number of switch refuse operations exceeds a preset switch refuse operation number within a first preset time range, the score of the switch refuse operation condition indicator is reduced by a ninth preset deduction value on the basis of the bonus value.

### Claim 15 (depends on 11)

The method of claim 11, wherein the condition indicators of the post-mounted vacuum switch comprise the switch maloperation condition indicator; wherein the obtaining the scores of the condition indicators of the post-mounted vacuum switch comprises:
counting a number of switch maloperations of the post-mounted vacuum switch; and
analyzing the number of switch maloperations according to a tenth preset analysis rule to obtain the score of the switch maloperation condition indicator;
wherein the tenth preset analysis rule comprises: every time the switch maloperation occurs, the score of the switch maloperation condition indicator being reduced by a tenth preset deduction value on the basis of the bonus value; if the cumulative number of the switch maloperations exceeds a preset switch maloperation number within a second preset time range, the score of the switch maloperation condition indicator being reduced by an eleventh preset deduction value on the basis of the bonus value.

### Claim 16 (depends on 1)

The method according to claim 1, wherein the method for obtaining the repair coefficient Xf comprises:
according to predetermined defect levels or fault levels and predetermined repair status levels, searching a preset fault repair table to obtain the repair coefficient.

### Claim 17 (depends on 16)

The method of claim 16, wherein the predetermined defect levels or fault levels comprise: Lev=0, indicating the defect or the fault is not serious, Lev=1, indicating the defect or the fault is serious, and Lev=2, indicating the defect or the fault is urgent;
the predetermined repair status levels comprise: XF=0, indicating that the defect or fault has been completely repaired, XF=1, indicating that the defect or fault has not been completely repaired, XF=2, indicating that the defect or fault has not been repaired;
the preset fault repair table comprises:
Lev=0, XF=0, Xf=0.99;
Lev=0, XF=1, Xf=0.97;
Lev=0, XF=2, Xf=0.95;
Lev=1, XF=0, Xf=0.95;
Lev=1, XF=1, Xf=0.93;
Lev=1, XF=2, Xf=0.7;
Lev=2, XF=0, Xf=0.95;
Lev=2, XF=1, Xf=0.9;
Lev=2, XF=2, Xf=0.5.

### Claim 18

A condition assessment device for an outdoor post-mounted vacuum switch, comprising:
a model establishment module, configured to establish a condition assessment mathematical model of the post-mounted vacuum switch, and obtain scores of condition indicators of the post-mounted vacuum switch; and
a condition assessment module, configured to acquire a condition assessment score based on the condition assessment mathematical model of the post-mounted vacuum switch and the scores of the condition indicators of the post-mounted vacuum switch, so as to realize on-line monitoring of a health condition of the post-mounted vacuum switch and assess the health condition of the post-mounted vacuum switch;
wherein the condition assessment mathematical model of the on-column vacuum switch is configured as follows:
M
=
M
0
-
∑
i
=
1
10
⁢
⁢
M
i
wherein the M is the condition assessment score; Mi denotes the score of the ith condition indicator of the post-mounted vacuum switch; and M0=100 KTXf, Xf denotes a repair coefficient, and a lifetime coefficient KT=(100−0.5Y)/100, wherein the Y denotes a service life.