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RTS-5
Relay Test Set — Single Phase (Secondary Current Injection)
Single-phase relay test set — 0–200 A AC current (14 V/4 V), 0–250 V AC, built-in digital timer. Max 400 VA.
— Protection Testing · Relay Test Sets
Relay Test Sets
Single-phase and three-phase relay test sets for commissioning and testing of protection relays. Variable AC/DC current and voltage sources with phase angle control.
3 instruments in this category
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RTS-5A
Relay Test Set — Single Phase, 1000 VA (Portable Trolley)
Portable trolley-style single-phase relay test set — 0–200 A AC (6 V/50 V), AC or DC voltage output, dual-range timer. Max 1000 VA.
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RTS-33
Three-Phase Relay Test Set
Three-phase, two-unit relay test set — 0–360° phase angle, 0–50 A current, 415 V 3-phase input. For distance, directional, and differential relay testing.
Frequently Asked Questions
What is a relay test set used for?
A relay test set is used for secondary injection testing of protection relays — verifying that overcurrent relays, earth fault relays, distance relays, and differential relays operate correctly at their set values. Testing involves injecting calibrated AC current, AC/DC voltage, and phase angle into the relay and measuring its operate time and value. CIE manufactures single-phase (RTS-5/5A) and three-phase (RTS-33) relay test sets.
What is the difference between CIE RTS-5 and RTS-33?
The CIE RTS-5 and RTS-5A are single-phase relay test sets (400 VA) providing variable AC current and voltage for testing overcurrent, earth fault, and other single-phase protection relays. The CIE RTS-33 is a three-phase relay test set providing three-phase AC current, AC and DC voltage, and continuously variable 0–360° phase angle — essential for testing distance relays, differential protection, and directional overcurrent relays.
About Relay Test Sets
Protection relay testing is a critical activity in power system commissioning and maintenance — every relay protecting a transmission line, transformer, bus, or feeder must be tested to verify that it will operate correctly under fault conditions. CIE manufactures single-phase and three-phase relay test sets for secondary current injection testing of protection relays.
The CIE RTS-5 and RTS-5A are single-phase relay test sets providing continuously variable AC current from 0 to 200 A across multiple ranges, with built-in digital timer (0–99.99 sec), digital ammeter, and AC voltmeter. They are used for testing over-current relays, earth fault relays, and other single-phase protection devices. The RTS-33 is a three-phase relay test set providing variable three-phase AC current, AC and DC voltage, and continuously variable phase angle (0–360°) — essential for testing distance relays, differential relays, and directional protection relays.
CIE relay test sets are used by protection engineers at power utilities, EPC commissioning companies, and testing laboratories. They are supplied to PGCIL, WBSETCL, state electricity boards, Indian Railways, and commissioning contractors across India — Kolkata, Howrah, Delhi, Bangalore, Mumbai, Chennai, Hyderabad, Bhubaneswar, Lucknow, Chandigarh, and all major power sector locations.
Cambridge Instruments & Engg. Co. (CIE) — manufacturer of precision electrical test and measurement instruments in Howrah, West Bengal, India, established 1963. Pan-India supply: Kolkata · Howrah · Bhubaneswar · Cuttack · Bangalore · Chennai · Hyderabad · Mumbai · Pune · Delhi · Ahmedabad · Lucknow · Chandigarh · Ranchi · Raipur · Visakhapatnam · Nagpur.
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