The model HES-1S/1C automatic CT/PT tester is a modern tester with advanced technology, automatic instrument for fast, accurate measurement of instrument transformer errors. It is designed for use in laboratories, manufacturing processes, quality control procedures and official metrology station. Because of its compact design and light weight, it is suitable for field test.
HES-1S will sample directly the error signal, through calculation, display simultaneously percentage reading, in-phase error, quadrature error of transformer. The tester is easy in operation, direct in reading.
HES-1C is equipped with RS232 for easy communication.
- Modern with advanced technology and automatic measurement. The measuring results can be read directly from digital displays.
- Digital display simultaneously percentage reading, in-phase error, quadrature error of transformer
- Use with secondary current 5A, 1A or secondary voltage 100V, 100/√3V, 110V and can be replaced by 110/√3V, 100/3V, 200V or 220V etc. upon request.
- Measure secondary impedance of tested transformer.
- Measure secondary voltage drop together with isolated PT and controlling cabinet.
- Automatically indicate polar
- Its built-in self-test circuit can monitor the precision of instrument itself.
- Easy in operation, fast in measurement, compact in design, suitable for field test.
1) Measuring object：CT, PT, impedance, admittance.
2) Measuring range：
Ratio error measuring range：±0.0001——199.99%, Min. resolution：0.0001%
Phase angle error measuring range：±0.001——999.9’, min. resolution：0.001ˊ
Impedance (Ω) measuring range：0.0001——19.99Ω, min. resolution: 0.0001Ω
Admittance (ms) measuring range: 0.0001—-19.99ms, min. resolution: 0.0001ms
3) Basic error:
in-phase component: ΔX=±(X ∙1%＋y ∙ 1%+1 digit)
quadrature component: Δy=±(X ∙1%＋y ∙ 1%+1digit)
Built-in amp. and voltmeter in compliance with the relevant standard. Display range above 0.00-120%.
Error of percentage meter: better than±1.0%
4) Working range:
Error of Working current or volt percentage meter±1.5%, display range current (0－199.9%)
Voltage: (0－199.9%) (Un voltage measuring range=100V, 100/√3V, 100/3V)
5) Working load:
Current: To against Tx <0.12Ω cosφ=1
Voltage: a against x <0.25VA (100V)
6) Wrong polar indication:
Rated working current (voltage) <20%, should have polar indication.
Wrong ratio indication:
If rated working current (voltage) <20%, should have wrong ratio indication.
During measurement, stable, small ratio, strong interference ability.
7) Ambient condition:
Ambient temp.: 5℃~40℃
Relative humidity: <70%（25℃）
Power frequency: 50±1HZ Power consumption <20VA
Power supply:220±15%(indoor), 100V±10% (outdoor)
8) Power socket can stand 1.5KV, 1min. voltage withstanding against outer casing, tester can be grounded safely.
9) Appearance and material: nice and good quality outer casing.
10) Can carry out lull load and light load test according to different accuracy requirement and different measuring point as per requirement of standard.