描述
在電能計量中,互感器錯接線會造成有功電能計量不準,實際上互感器錯接線也會對無功電能計量造成影響,從而使得用戶的計量不準?,F(xiàn)將常出現(xiàn)的互感器錯接線對無功電能計量的影響試舉幾例。
1三相電流互感器二次極性全接反
功率表達式為:Qa=IaUbccos(90°+φa)
Qb=IbUcacos(90°+φb)
Qc=IcUabcos(90°+φc)
三元件功率和為:Q=Qa+Qb+Qc
=IaUbccos(90°+φa)+IbUcacos(90°+φb)+IcUabcos(90°+φc)
=-(IaUbcsinφa+IbUcasinφb+IcUabsinφc)
當三相電路平衡時,Ua=Ub=Uc
Ia=Ib=Ic
φa=φb=φc
則Q=-3IaUbcsinφa
實際無功功率Q′=3IaUbcsinφa
所以無功電能表反轉,無功電能表反計量數(shù)值與正常計量數(shù)值基本相等。
2兩相電壓元件接錯
假設A、C兩相電壓元件接錯,則各元件所計功率表達式為:
Qa=IaUbacos(150°-φa)
Qb=IbUaccos(90°+φb)
Qc=IcUcbcos(30°-φc)
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39 CL7001X1-A2 CONFIG CONTROLLER 1
40 CL7001X1-A5 CONFIG CONTROLLER 4
41 CL7001X1-A6 CONFIG CONTROLLER 3
42 CL7001X1-AG CONFIG CONTROLLER 2
43 CL7002 PC BOARD 4
44 CL7002-A1 COMPUTING PWB 1
45 CL7002X1-A2 COMPUTING PWB 1
46 CL7004X1-A1 IAC DIO MODULE 1
47 CL7005X1-A1 IAC PIO MODULE 3
48 CL7011X1-A2 COMPUTING CONTROLLER 4
49 CL7011X1-A5 COMPUTING CONTROLLER 3
50 CL7014-A1 IAC DIO MODULE 1
51 CL7652X1-A1 DUAL CIA 10
52 CL7652X1-A2 DUAL CIA 4
53 CP7202 PWR CONVERSION ASSY 4
54 CP7202X1-A1 PWR CONVERSION ASSY 3
55 CP7202X1-A1-67 PWR CONVERSION ASSY 1
56 CP7222X1-A1 PWR CONVERSION ASSY 1
57 DC6301X1-EA7 KEYBOARD P.S.1
58 DC6400-??KEYBOARD 1
59 DC6400-EA6 KEYBOARD 1
60 DC6400-FC3 KEYBOARD P/BTN LOGIC 1
61 DC6400-FC4 KEYBOARD P/BTN LOGIC 1
62 DC6400X1-EA35 KEYBOARD 2
63 DC6400X1-FC4 KEYBOARD P/BTN LOGIC 1
64 DC6400X1-FC5 KEYBOARD P/BTN LOGIC 1
65 DC6431X1-CC1 PROVOX KEYBOARD 1
66 DC6460 RT VAX 2
67 DC6460X-WA5 RT VAX 1
68 DC6481X1 PROVOX PRINTER 1
69 DC6481X1-A1 PROVOX PRINTER 1
70 DC6486 PRINT SPOOLER 1
71 DC6501X1-EA6 Keyboard cont PWB Assy 5
72 DH6011-X1 I/O CARD DCU I/O DH6011 2
73 DH6011X1-DA1 DCU I/O 2
74 DH6011X1-GA1 MPU ROM 1
75 DH6011X1-GA2 MPU/ROM 2
76 DH6220X1-BA2 MPU ROM 1
77 DH7001 PWB ASSY COM 3
78 DH7001X1-A2 PWB ASSY COM 2
79 DH7001X1-A3 PC BOARD 9
80 DH7001X1-A3-86 COM INTERFACE 3
81 DH7001X1-A3-91 COM INTERFACE 1
82 DH7010X1-A1 POWER ASSY 3
83 DH7051 RAM CARD 1
84 DH7201X1-A1 COMMON RAM CARD 5
85 DH7201X1-A2 COMMON RAM 2
86 DH7201X1-A3 COMM RAM CARD 1
87 DH7201X1-A4 COMMON RAM 1
88 DM6001X1 MUX RAM CARD 4
89 DM6001X1-C1 NV MEMORY 1
90 DM6001X1-EA3 EXPANSION ROM 1
91 DM6001X1-FA1 PARALLEL I/O INTERFACE 2
92 DM6001X1-FA3 PARALLEL I/O INTERFACE 1
93 DM6001X1-GA1 PWR CONVERSION ASSY 1
94 DM6001X1-KA21 MPU ROM 1
95 DM6001X1-KA3 MPU/ROM 1
96 DM6001X-C1 NON VOL MEMORY 1
97 DM6003-GA2 PARALLEL BUFFER 3
98 DM6003X1-GA2 PARALLEL BUFFER 14
99 DM6003X1-GA2-1 PARALLEL BUFFER 1
100 DM6003X1-GA2-24 PARALLEL BUFFER 5
101 DM6311X1-A1-49 MUX AIN 2
102 DM6311X1-A1-77 ANG/INPUTS/END 6
103 DM6311X1BA CIRCUIT BOARD,FISHER DM6311X1BA 1
104 DM6363X1-A2 ISO DISCRETE 5
105 FSCL7001-1A6 CIRCUIT BOARD,FISHER FSCL7001-1A6 CONFIGURABLE CONTROLLER W/DISCRETE I/O OPTION 44
106 FSCL7006-A1 CIRCUIT BOARD,FISHER FSCL7006-A1 INTERCONNECT ASSY(4-WIDE)11
107 FSCS6201EA1 CIRCUIT BOARD,FISHER FSCS6201EA1 DISPLAY STATION 1
108 FSDC6201EB1 CIRCUIT BOARD,FISHER FSDC6201EB1 STATION DISPLAY ASSY 4
109 FSDC6301EA5 CIRCUIT BOARD,FISHER FSDC6301EA5 KEY CONFIGURATION ASSY 2
110 FSDC6501EA3 CIRCUIT BOARD,FISHER FSDC6501EA3 KEY CONTROL 6
111 FSDC6501FA1 CIRCUIT BOARD,FISHER FSDC6501FA1 6703 VDU CPU ASSY 3
112 FSDC6551HB1 CIRCUIT BOARD,FISHER FSDC6551HB1 6703 PMC FEM ASSY 1
113 FSDH60025PRMPU CIRCUIT BOARD,FISHER FSDH60025PRMPU NTDMPU 2
114 FSDH6008DA1 CIRCUIT BOARD,FISHER FSDH6008DA1 MPU/ROM 2