Construction
1 Meter case
Two types of the cases (protective-class I and II) are available.
2 Terminal block
The terminal block is molded of Bakelite. The voltage test link can
be located inside or outside of the meter case.
3 Driving element
The driving element consists of a voltage element and a current
element, both of which are fixed on the steel frame of fine
magnetic conductivity. It has a load curve compensation device, low
load and inductive load adjustment mechanisms.
4 Rotor
The worm is an un-detachable part of the rotor shaft so that the
mesh between the worm and shaft is improved. Both ends of the shaft
are embedded with graphite bearing to ensure the long service life
of the meter.
5 Braking element
The magnet is made of AlNiCo5 alloy and designed as U-shaped so
that the effect of short time over currents upon the magnet is
negligible.
6 Frame
The frame is made of high-quality steel. Its surface is treated by
negative electrophoresis to achieve excellent corrosion-proof.
7 Upper bearing
The upper bearing consists of a guide pin and a brass sleeve, and
is fixed into the meter frame by one screw.
8 Lower bearing
Both Al-Ni-Co alloy and detachable hard ferrite magnetic bearings
are available.
9 Register
The register adopts heat- and abrasion-proof plastic gears and
bearings. No lubrication of bearings is needed during the service
life. The drum is made of polycarbonate, and is pyrographed and
printed by UV resistant alumina to ensure non-depigmentation. Technical data
1. Meter type HLD03 (DD58)
2. Applicable Standards IEC60521, BS5685
3. Accuracy Class 2(according to IEC60521)
4. Average service life (MTTF) 20 years
5. Basic current (Maximum current) A 1. 5(6) 3(6) 5(20) 5(40)
10(60) 15(60) 20(80)
7. Rating current of transformer in 5A direct connection
8. Reference voltage Un 110V, 120V, 220V, 230V, 240V
9. Reference frequency fn 50 Hz, 60 Hz
10. Power losses in voltage circuit at 50 Hz Un 1. 0 W/5 VA
11. Power losses incurrent circuit at 50Hz Un Ib<0. 6 VA
12. Non-running with no-load 0. 8~1. 1Un
13. Staring current 0. 5%Ib
14. Mean temperature coefficient: From 0. 1Ib to Imax at unity
PFFrom 0. 2Ib to Imax at unity 0. 5 lagging<0. 08%/oC<0. 12%/
oC
15. Insulation level: Withstand A. C. Voltage for 50 Hz, 1min
Withstand impulse voltage 1. 2/50us>2 kV (when bakelite
base>4kV)>6kV (when bakelite base>8kV)
16. Rated load torque at unity PF, Ib 450uNm
17. Weight of rotor: 24g
18. Weight of meter =1. 5kg
19. Meter base Bakelite or steel
20. Meter cover Bakelite or transparent PC
21. Terminal cover Bakelite or PC
22. Register Cyclometer single, unidirectional, jumping
23. Option Reverse running stopper, pulse-sampling device |
